JP2010233655A - Sphygmomanometer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To measure blood pressure with simple operation for pressurizing a forearm of a subject by using an air bag to obtain a blood pressure value. <P>SOLUTION: A housing 17 of a sphygmomanometer 10 has a pair of plate portions 26a, 26b fixed almost in parallel and a joint portion 26c for joining one ends of the plate portions 26a, 26b. A space portion 28 gripped by the housing 17 is provided with the air bag 30 which is folded back on the joint side, provided along the respective plate portions 26a, 26b, and pressurizes a wrist A inserted between the plate portions. The air bag 30 has a first expansion portion 36 and a second expansion portion 38 surrounded by the first expansion portion 36 in an unfolded state. The first expansion portion 36 is formed with a stopper expansion portion 40 having a part placed at an opening portion 28a and expanding more than the other portions. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a sphygmomanometer that obtains blood pressure by pressing a forearm of a measurement subject with an air bag.

  Home blood pressure monitors are becoming popular so that blood pressure can be measured on a daily basis for health management. It is desirable that a home sphygmomanometer not only accurately measures blood pressure but also has a simple operation method, is inexpensive, and is compact.

  Blood pressure monitors can be mainly classified into upper arm type and wrist type with respect to the measurement site. The wrist type is small and light and suitable for home use. Examples of wrist blood pressure monitors include Patent Document 1, Patent Document 2, and Patent Document 3.

  The wrist type sphygmomanometer adopts an oscillometric method for obtaining a blood pressure value based on the pressure state of the air bag and the fluctuation state of the arterial wave of the air bag. The formula is adopted.

  The hook-and-loop-type armband can reduce the capacity of the air bag so as to be in close contact with the arm, and is suitable for the oscillometric method for detecting the arterial wave.

Japanese Patent No. 3818220 JP 2006-81655 A JP 2008-104666 A

  A wrist-type sphygmomanometer uses a hook-and-loop fastener type, but the work to wrap and remove the armband around the wrist must be done with one hand on the opposite side of the measurement arm, which may be difficult for the elderly or sick is there. Moreover, the winding state and position of the armband can affect the blood pressure measurement result.

  Furthermore, if the arm-in type, which measures the blood pressure by inserting the arm into the cylindrical housing used in the upper arm type, is adopted for the wrist type, an insertion part that can pass the palm in the housing is secured. As a result, the air bag becomes unnecessarily large in diameter and must be inflated considerably to press the wrist. As a result, the air bag has a large capacity and is not suitable for the oscillometric method.

  The present invention has been made in consideration of such problems, and an object thereof is to provide a blood pressure monitor that can be easily operated.

  The sphygmomanometer according to the present invention includes a housing having a pair of plate-like portions facing each other and a connecting portion that connects one ends of the pair of plate-like portions, and one plate-like shape along the inner surface of the housing. An air bag that is folded at the connecting portion, extends to the other plate-like portion, is placed, and compresses the forearm of the measurement subject inserted between the pair of plate-like portions; And pressurizing means for supplying air to the air bag.

  As described above, in the sphygmomanometer based on a pair of plate-like portions connected at one end, it is not necessary to wrap the armband, and blood pressure can be measured simply by inserting the forearm. Basically, it is not necessary to pass the palm between the plate-like portions, and the gap between the plate-like portions is appropriately narrowed, and the capacity of the air bag can be reduced. The forearm here means including the wrist.

  The housing may form a space portion by a substantially U-shaped inner surface of the pair of plate-like portions and the connecting portion. If the inner surface is U-shaped, it is easy to insert the forearm.

  At least one of the pair of plate-like portions may be inclined in a direction in which the distance from the other plate-like portion is narrowed toward the opening on the other end side. Thereby, it is possible to prevent the forearm inserted between the plate-like portions from being carelessly removed.

  When the forearm is inserted into the housing, the pair of plate-like portions are elastically separated from each other, and the forearm can be easily inserted when the opening on the other end is widened.

  The air bag may form a retaining inflatable portion in which both end portions located on the other end side of the pair of plate-like portions are inflated larger than the vicinity of the center located in the connecting portion. Such a retaining expansion part can prevent the forearm from coming out of the space part of the housing.

  When the air bag is unfolded, the air bag has a first inflating part provided with the retaining inflating part at both ends, and a second inflating part that is surrounded by the first inflating part and is not in communication with the first inflating part. May be. According to such a configuration, it is easy to form the retaining expansion part.

  The pressurizing unit may supply air to the second expansion unit after supplying air to the first expansion unit during blood pressure measurement. In addition, the pressure sensor includes one or more sensors that detect pressures of the first and second inflating parts, and the pressurizing unit uses the pressure of the second inflating part when measuring blood pressure. The following may be used. As a result, the forearm of the measurement subject is stably held by the first inflating part, and the pressurization and decompression by the second inflating part are appropriately performed. However, the pressurization of the second expansion part may be started before the pressurization of the first expansion part is completed.

  The air bag is unfolded in a state where the anti-inflatable portion is provided at both ends, the first inflatable portion including two communication paths connecting the anti-inflatable portions, the anti-inflatable portion, and the communication path. A second inflated portion that is enclosed and is not in communication with the first inflating portion, and a pair of cuts provided between the first inflating portion and the second inflating portion. According to such a break, the mutual influence between the retaining expansion part and the second expansion part is reduced, the retaining expansion part is at a position suitable for the function of retaining and the second expansion part is at a position suitable for ischemia. It can be arranged to some extent independently.

  In this case, the pair of cuts are formed from both ends of the first direction cut between the second expansion part and the passage part, and between the second expansion part and the passage part. A second direction cut extending a predetermined length toward the central direction may be used.

  The pressurizing means is provided in a pressure pump, a switching valve that switches a flow path from the pressure pump to the first expansion section or the second expansion section, and a flow path that communicates with the first expansion section. You may have a 1st exhaust valve and the 2nd exhaust valve provided in the flow path connected to the said 2nd expansion part. By providing such a switching valve, the pressure pump can be shared by the first expansion section and the second expansion section. Further, by providing the first exhaust valve and the second exhaust valve, it is possible to individually depressurize the first expansion section and the second expansion section, and it is possible to perform depressurization appropriate for the oscillometric method.

  The sphygmomanometer according to the present invention does not require winding of an arm band, and blood pressure can be measured simply by inserting a forearm. Basically, it is not necessary to pass the palm between the plate-like portions, and the gap between the plate-like portions is appropriately narrowed, and the capacity of the air bag can be reduced.

It is a perspective view of the sphygmomanometer according to the present embodiment. It is a disassembled perspective view of the blood pressure monitor in this Embodiment. FIG. 3A is a plan view of the air bag in a developed state, and FIG. 3B is a perspective view of the air bag in a state where the air bag is pressurized alone. It is a cross-sectional front view of the armband in a state where the air bag is pressurized. It is a block block diagram of the main body in this Embodiment. It is a flowchart (the 1) which shows the procedure of blood pressure measurement. It is a flowchart (the 2) which shows the procedure of blood pressure measurement. It is a partially-omission perspective view of the sphygmomanometer in a state where the first inflating part is pressurized. It is a partially omitted perspective view of the sphygmomanometer in a state where the first and second inflating parts are pressurized. It is a cross-sectional side view of the armband in a state where the air bag is pressurized. FIG. 11A is a plan view of the air bag according to the first modified example in a developed state, and FIG. 11B is a perspective view of the air bag according to the first modified example in a state of being pressurized alone. FIG. 12A is a plan view of an air bag according to the second modified example in a developed state, and FIG. 12B is a perspective view of the air bag according to the second modified example in a state where the air bag is pressurized alone. FIG. 13A is a plan view of an air bag according to a third modified example in a developed state, and FIG. 13B is a perspective view of the air bag according to the third modified example in a state of being pressurized alone. It is a perspective view of the blood pressure meter concerning a modification.

  Hereinafter, embodiments of the sphygmomanometer according to the present invention will be described with reference to FIGS.

  As shown in FIG. 1, a sphygmomanometer 10 according to the present embodiment is a wrist type, and an arm band (also called a cuff or a manchette) 12 into which a wrist (forearm) of a measurement subject is inserted, and a main body. 16 and a housing 17 that houses the main body 16 and in which the armband 12 is installed. The sphygmomanometer 10 is driven by a commercial AC power supply or a battery (including a secondary battery). In FIG. 1 (and FIG. 14), the cloth cover 32 is omitted so that the configuration of the armband 12 can be visually recognized. As is clear from FIG. 1, the armband 12 in the sphygmomanometer 10 is substantially U-shaped and has an opening 28a unlike the conventional one, but for convenience of explanation, I will call it.

  The main body 16 is accommodated in a housing 17, and is obtained by a pressurizing means 18 that supplies and exhausts air to and from the armband 12, a control unit 20 that measures the blood pressure of the measurement subject, and a control unit 20. The display unit 22 displays the blood pressure and the operation buttons 24.

  The housing 17 has a pair of plate-like portions 26a and 26b facing each other, and a connecting portion 26c whose inner surface that smoothly connects one ends of the plate-like portions 26a and 26b has a semicircular arc shape. Is substantially U-shaped in a side view. The plate-like portions 26a and 26b and the connecting portion 26c are integrally formed of a resin material. The housing 17 forms a space 28 by the substantially U-shaped inner surfaces of the plate-like portions 26a and 26b and the connecting portion 26c.

  The armband 12 includes an air bag (also referred to as an air bag or a bladder) 30 provided in a space 28 surrounded by the inner surface of the housing 17 and a flexible cloth cover 32 that covers the air bag 30 so that the air bag 30 is not exposed. .

  Hereinafter, with reference to the armband 12, the closed side by the semicircular arc portion 26 is the X1 side, the opposite opening side is the X2 side, the direction connecting the X1 side and the X2 side is the X direction, The direction facing 28 is the Y direction. The housing 17 is U-shaped when viewed in the Y direction.

  The main body 16 is provided outside the connecting portion 26c. The air bag 30 is folded back on the X1 side in the space portion 28, provided along the plate-like portions 26a and 26b, and can press the inserted wrist under the action of the pressurizing means 18. The cloth cover 32 is formed of a stretch material that can be expanded and contracted in an arbitrary direction.

  In the housing 17, since the plate-like portions 26a and 26b have elasticity, when the wrist is inserted, the space between the plate-like portion 26a and the plate-like portion 26b can be somewhat widened, and the wrist is inserted therebetween. It becomes easy to do. In this case, it is only necessary that at least one of the plate-like portions 26a and 26b has elasticity.

  The plate-like portions 26a and 26b are end portions on the opening side (X2 side), and have an inclined portion 34 that is inclined in the direction of narrowing the opening portion 28a. The plate-like portions 26a and 26b It is possible to prevent the wrist inserted between them from being inadvertently pulled out and to stably hold the retaining expansion portion 40 described later. In this case, at least one of the plate-like portions 26 a and 26 b only needs to have the inclined portion 34. In the plate-like portions 26a and 26b, only the inclined portion 34 has elasticity, and the other portions may be substantially inelastic. Since the plate-like parts 26a and 26b also have a function of holding a second inflating part 38 and a retaining inflating part 40 described later, the plate-like parts 26a and 26b are moderately hard while having elasticity.

  The sphygmomanometer 10 is small and lightweight, and can be measured with the wrist in an arbitrary position and posture. For example, the blood pressure monitor 10 may be measured with the wrist at the height of the heart. The sphygmomanometer 10 can also be measured in a state of being placed on a table. The plate-like portion 26b and each lower surface of the main body 16 form a continuous plane and are stably placed on the table.

   As shown in FIGS. 3A and 3B, the air bag 30 is formed in a bag shape by welding the rectangular portions around and around the two resin sheets. In FIG. 3A (and FIGS. 11A and 12A), the welded portion is hatched so as to facilitate identification. The air bag 30 may be formed into a bag shape by folding a single resin sheet and welding three sides other than the folded portion. The resin sheet forming the air bag 30 is a transparent urethane sheet. 3A and 3B, the air bag 30 is shown in an unfolded state, but the sphygmomanometer 10 is provided in the space 28 in a state of being folded back at the center. The air bag 30 is not pressurized alone at the product level, but in FIG. 3B (and FIG. 12B, FIG. 12B), a state where it is pressurized alone is shown to facilitate understanding of its function.

  The width of the air bag 30 in the Y direction (short direction) in FIG. 3A is slightly smaller than the width of the plate-like portions 26a and 26b, and the length in the X direction (long direction) in FIG. It is formed slightly smaller than the length along the plate-like portion 26a, the connecting portion 26c, and the plate-like portion 26b, and has a rectangular shape as a whole.

  The air bag 30 is partitioned into a first inflating part 36 and a second inflating part 38. The 1st expansion part 36 and the 2nd expansion part 38 are not connected, and are independent in internal space. In a state in which the air bag 30 is deployed, the first inflating part 36 is provided so as to surround the rectangular second inflating part 38 at the center. At both ends in the X direction of the first inflating portion 36, portions outside the second inflating portion 38 form a retaining inflating portion 40. The first inflating part 36 has a retaining inflating part 40 and two other passage parts 42. The passage portion 42 is a thin passage that is provided on both outer sides with respect to the Y direction of the second inflating portion 38 and communicates with the retaining inflating portions 40 at both ends.

  The first inflating portion 36 is connected to the first tube 46a through the first nozzle 44a at the central portion in the X direction in the one passage portion 42, and the second inflating portion 38 is at the central portion in the X direction. It is connected to the second tube 46b via the two nozzles 44b. The first nozzle 44a and the second nozzle 44b are provided at positions separated on both sides in the Y direction, and are well balanced.

  The second inflating portion 38 has a width W2 in the Y direction that is set to a necessary and sufficient length suitable for wrist ischemia. For example, the width W2 may be matched with the width of the air bag in a conventional wrist blood pressure monitor. Regarding the first inflating portion 36, the width W1 in the Y direction of the retaining inflating portion 40 is set to be appropriately larger than the width W2, and the width W3 in the Y direction of the passage portion 42 is set to be sufficiently narrower than the width W2. . The width W1 may be set to about 30 mm to 70 mm, for example.

  As can be understood from FIGS. 3A and 3B, the second expansion portion 38 has a small capacity and can easily transmit pressure fluctuations due to pulse waves to the pressure sensor 86 (see FIG. 5).

  The removal inflating portion 40 has a function of preventing the wrist inserted into the space portion 28 from falling out during blood pressure measurement. That is, the second inflating portion 38 having a blood-blocking function presses the wrist inserted into the space portion 28 from substantially three directions, and as such, receives a force pushed toward the opening portion 28a on the X2 side. . The removal inflating portion 40 prevents the wrist from coming off by completely or substantially closing the opening 28a. For this reason, it is desirable that the retaining expansion portion 40 expands larger than the second expansion portion 38, the width W1 is set to be larger than the width W2, and the X-direction length L1 is set to about 30 mm to 60 mm.

  Moreover, since the 1st expansion | swelling part 36 and the 2nd expansion | swelling part 38 have a different function, it is desirable that it can pressurize separately and can arrange | position separately. The first inflating part 36 and the second inflating part 38 are not in communication, and can be pressurized individually from the first tube 46a and the second tube 46b. On the other hand, in order to arrange separately, the 1st expansion part 36 and the 2nd expansion part 38 should just be made into a different body, but the number of parts increases, cost increases and assembly nature falls.

  Therefore, in the air bag 30, the first inflating part 36 and the second inflating part 38 are connected and integrated at the central part, and between the first inflating part 36 and the second inflating part 38 except for the central part. Two cuts 50 are provided in the case. Each cut 50 includes a Y-direction cut (first-direction cut) 52 between the second expansion portion 38 and the retaining expansion portion 40, and both ends of the Y-direction cut 52 between the second expansion portion 38 and the passage portion 42. And an X-direction cut (second-direction cut) 54 extending a predetermined length from the center toward the center. The Y-direction cut 52 and the X-direction cut 54 do not need to extend strictly in the X-direction and the Y-direction. For example, the Y-direction cut 52 and the X-direction cut 54 may be connected in a smooth curved shape. .

  According to such a cut 50, the mutual expansion of the retaining expansion part 40 and the second expansion part 38 is reduced, the retaining expansion part 40 is located at a position suitable for the function of retaining, and the second expansion part 38 is blood-blocking. It is possible to arrange them independently at a position suitable for

  The two passage portions 42 connect the two retaining expansion portions 40 in a well-balanced manner, and act as a passage for supplying air from the first nozzle 44a to the retaining expansion portion 40. There is no. Since the wrist ischemic action is performed by the second inflating portion 38, it is desirable that the passage portion 42 in parallel therewith has a small expansion amount so as not to hinder the action of the second inflating portion 38, and the width W3 is smaller than the width W2. Set it sufficiently small. On the other hand, if the width W3 is excessively narrow, the supply of air to the retaining expansion portion 40 is hindered, so that it is preferable to set it to about 5 × W3≈W2.

  Accordingly, as shown in FIG. 4, the second inflating portion 38 can be appropriately inflated to block the wrist, and the passage portion 42 has an amount of expansion smaller than that of the second inflating portion 38, and thus has a blood-blocking action. Will not be affected.

  As shown in FIG. 5, the control unit 20 is a part that integrally controls the entire sphygmomanometer 10, and is configured based on a CPU 60, and includes an A / D converter 66, a pump driver 68, and the like. The first exhaust valve driver 70, the second exhaust valve driver 72, the switching valve driver 74, and the storage unit 76.

  The pressurizing means 18 includes a pressurizing pump 78, a first exhaust valve 80, a second exhaust valve 82, a flow path switching valve 84, a pressure sensor 86, and the like. The A / D converter 66 converts the analog signal of the pressure sensor 86 into a digital value and supplies it to the CPU 60. The pump driver 68, the first exhaust valve driver 70, the second exhaust valve driver 72, and the switching valve driver 74 are a pressurizing pump 78, a first exhaust valve 80, a second exhaust valve 82, and a flow path switching valve under the action of the CPU 60. 84 is controlled. The second exhaust valve 82 can control the degree of opening so that the internal pressure P2 of the second expansion portion 38 can be gradually reduced. The first exhaust valve 80 may be the same as the second exhaust valve 82, but may be an on / off valve.

  The flow path switching valve 84 switches the air supplied from the pressurizing pump 78 to the first tube 46a or the second tube 46b and supplies the air, and pressurizes the first inflating part 36 and the second inflating part 38 individually. Can do. The first exhaust valve 80 is connected to a conduit communicating with the first tube 46a, and the second exhaust valve 82 is connected to a conduit communicating with the second tube 46b, and the first expansion portion 36 and the second expansion portion. 38 can be individually evacuated.

  The pressurizing pump 78 and the pressure sensor 86 are provided in the pipe upstream of the flow path switching valve 84 and are shared by the first expansion section 36 and the second expansion section 38, so that the number of components is not increased. It is. Depending on design conditions, separate sensors for measuring the internal pressure P1 of the first expansion portion 36 and the internal pressure P2 of the second expansion portion 38 may be provided.

  The storage unit 76 is a part that stores programs of the CPU 60, variables, blood pressure measurement values, and the like, and includes a ROM, a RAM, a flash memory, and the like.

  As a software processing unit, the CPU 60 includes a calculation unit 87 for obtaining blood pressure by an oscillometric method based on a pulse wave component obtained through the pressure sensor 86, a sequence unit 88 for defining an operation procedure of blood pressure measurement, and a calculation unit 87. And a result determination unit 90 for evaluating the obtained blood pressure value.

  The result determination unit 90 determines whether the blood pressure value obtained by the calculation unit 87 is appropriate, and if it is normal, displays the value on the display unit 22. Here, the term “normal” means that the signal state is appropriate, not as a health barometer. The result determination unit 90 displays a predetermined error when the blood pressure value obtained by the calculation unit 87 is not normal.

  The result determination unit 90 may determine whether the blood pressure value is appropriate, for example, whether the pulse is weak and the pulse wave cannot be recognized and the blood pressure cannot be determined.

  The sequence unit 88 controls the operation of each unit based on the operation of the operation button 24. Schematically, when a blood pressure measurement start operation is performed by the operation button 24, the first expansion unit 36 and the second expansion unit 36 are controlled while controlling the pressurizing pump 78 and the flow path switching valve 84 and monitoring the signal of the pressure sensor 86. The expansion part 38 is pressurized. Thereafter, the second exhaust valve 82 is controlled to depressurize the second expansion portion 38, and the first exhaust valve 80 is opened to depressurize the first expansion portion 36.

  The sequence unit 88 monitors the operation of the operation button 24, and performs a predetermined process corresponding to a predetermined interruption operation during blood pressure measurement. Moreover, display control of a pulse value, a past measurement value, etc. is performed based on a predetermined operation. The sequence unit 88 controls the procedure shown in FIG.

  Next, the operation of the sphygmomanometer 10 configured as described above will be described. In the sphygmomanometer 10, in the initial state, the first exhaust valve 80 and the second exhaust valve 82 are opened, and the first expansion portion 36 and the second expansion portion 38 are in a non-pressurized state.

  First, as shown in FIG. 1, the measurement subject inserts a wrist A into the space 28 of the armband 12. Basically, the wrist A is bent slightly elastically at the plate-like portions 26a and 26b, and the X2-side opening in the space 28 is widened and inserted through the opening. As a result, the wrist A can be inserted into the space portion 28 regardless of the size of the palm, and after insertion, the plate-like portions 26a and 26b return to their original positions, and the inclined portion 34 narrows the opening. The wrist A is stabilized in the space 28. Of course, depending on conditions, the wrist A may be inserted in the Y direction from a side opening other than the opening 28a.

  Next, when the measurement subject operates the operation button 24, measurement of blood pressure is started under the action of the control unit 20.

  In step S1 of FIG. 6, the first exhaust valve 80 and the second exhaust valve 82 are closed.

  In step S2, the air supply destination of the flow path switching valve 84 is set to the first tube 46a side.

  In step S <b> 3, the pressurizing pump 78 is driven to supply air to the first expansion unit 36.

  In step S4, the control unit 20 monitors the internal pressure P1 applied to the first expansion unit 36 and the first tube 46a based on the signal from the pressure sensor 86.

  In step S5, the end of pressurization to the first expansion portion 36 is determined while monitoring the internal pressure P1. That is, since the first expansion portion 36 expands and the internal pressure P1 increases, when it is detected that the predetermined pressure is reached, the pressurization of the first expansion portion 36 is terminated and the process proceeds to step S6. If the pressurization is continued, the process returns to step S4.

  The internal pressure P1 of the first inflating portion 36 is set to a pressure that is high to some extent so that the wrist A cannot be removed. By setting the internal pressure P1 of the first inflating portion 36 high, the plate-like portions 26a and 26b and the retaining inflating portion 40 act as if they are rigid annular arm bands, and have a wrist A retaining action.

  The internal pressure P1 of the first inflating part 36 may be set to about 150 mmHg to 250 mmHg, for example.

  At this time, as shown in FIG. 8, the two retaining expansion portions 40 are sufficiently expanded to completely close or substantially close the opening 28a to prevent the wrist from being pulled out, and the wrist A is stably held. Will be. The retaining expansion part 40 is stably arranged so as to be inward by the inclined part 34 and easily closes the opening 28a. 8 and 9, the plate-like portion 26a and the cloth cover 32 are omitted so that the air bag 30 can be visually recognized.

  The retaining inflatable part 40 can be arranged to some extent independently because it is separated from the second inflating part 36 by the cut 50, and is in a position suitable for closing the opening 28 a along the shape of the inclined part 34. Arranged.

  The passage portion 42 is connected to the retaining expansion portion 40. However, since the passage portion 42 is sufficiently thin and has little influence on the arrangement of the retaining expansion portion 40, it is connected to both ends of each retaining expansion portion 40 in the Y direction. Prevents natural twisting.

  Since the passage portion 42 communicates with the retaining expansion portion 40, the pressure is relatively high. However, since the passage portion 42 is sufficiently thin, there is no influence on the wrist A (see FIG. 4), and blood is not blocked at this point.

  In step S6, the air supply destination of the flow path switching valve 84 is switched to the second tube 46b side, and the supply of air to the second expansion portion 38 is started. Thereby, the supply of air to the first inflating part 36 is completed.

  In step S <b> 7, the pressurizing process monitors the internal pressure P <b> 2 applied to the second expansion portion 38 and the second tube 46 b based on a signal from the pressure sensor 86. The pressure sensor 86 automatically detects the pressure on the second tube 46b side by switching the flow path switching valve 84, and the detection signal switching process is substantially unnecessary.

  In step S8, the end of pressurization to the second expansion portion 38 is determined while monitoring the internal pressure P2. That is, since the internal pressure P2 immediately increases as the second expansion portion 38 expands, it is confirmed that the internal pressure P2 has increased to a predetermined ischemic pressure, and the process proceeds to step S9. When pressurization to the 2nd expansion part 38 is continued, it returns to Step S7.

  FIG. 9 shows a state where the pressurization to the second inflating portion 38 is finished.

  In step S9, pressurization by the pressurization pump 78 is terminated. The flow path switching valve 84 is maintained on the second tube 46b side. Accordingly, the internal pressure P2 of the second expansion portion 38 can be continuously detected by the pressure sensor 86.

  The internal pressure P2 of the second expansion part 38 is an appropriate pressure corresponding to ischemia and is set to be equal to or less than the internal pressure P1 of the first expansion part 36. The wrist A of the person to be measured is stably held by the first inflating portion 36, and the pressurization and decompression by the second inflating portion 38 are appropriately performed.

  In this way, the first inflating part 36 is pressurized first, and then the second inflating part 38 is pressurized, and the internal pressure P2 of the second inflating part 38 is made equal to or less than the internal pressure P1 of the first inflating part 36. The wrist A is stably held by the first inflating portion 36, and pressurization and decompression by the second inflating portion 38 are appropriately performed. However, depending on the circuit, the pressurization of the second expansion portion 38 may be started before the pressurization of the first expansion portion 36 is completely completed.

  The internal pressure P2 of the second expansion portion 36 may be set to about 150 mmHg to 240 mmHg, for example.

  As shown in FIG. 10, when the second inflating portion 38 is pressurized and inflated, the wrist A receives a force of pressing from approximately three directions, and receives a force in the X2 direction as a resultant force. However, in the opening portion 28a in the X2 direction, the retaining expansion portion 40 has already expanded to close or substantially close the opening portion 28a, and the wrist A will not come out of the space portion 28 during the sphygmomanometer. .

  In step S10, the second exhaust valve 82 is appropriately opened, and the second expansion portion 38 is decompressed to about 2 to 5 mmHg / sec. In order to obtain a stable measurement state, the second inflating portion 38 is depressurized at a substantially constant speed.

  In step S <b> 11 of FIG. 7, the calculation unit 87 detects the magnitude of the pulse wave obtained from the pressure sensor 86. At this time, the second inflating portion 38 is independent from the first inflating portion 36 as an internal space, and the internal pressure P2 does not propagate to the first inflating portion 36 due to its isolation action, and the artery opens and the pulse wave When this occurs, the pulse wave is easily transmitted to the pressure sensor 86.

  In step S12, the calculation unit 87 temporarily determines the systolic blood pressure value based on the sudden increase in the pulse wave amplitude. If no pulse wave is generated or is sufficiently small, the process returns to step S11.

  The pulse wave amplitude further increases and reaches its peak. This pressure is the mean blood pressure. Thereafter, the pulse wave amplitude decreases, and at a certain pressure, the pulse wave amplitude rapidly decreases.

  In step S <b> 13, the calculation unit 87 temporarily determines the minimum blood pressure value based on the sudden decrease in the pulse wave. When the pulse wave has not decreased, the process returns to step S11.

  In step S14, the first exhaust valve 80 and the second exhaust valve 82 are opened to exhaust from the first expansion section 36 and the second expansion section 38, and the internal pressures P1 and P2 are set to 0, respectively.

  In step S15, the result determination unit 90 determines whether the systolic blood pressure value and the minimum blood pressure value temporarily determined in steps S12 and S13 are appropriate as described above.

  In step S16, the obtained maximum blood pressure value and minimum blood pressure value are displayed on the display unit 22 in units of mmHg or Pa. The display unit 22 may display additional information such as a pulse and a pulse pressure. When there is an abnormality, a predetermined error is displayed.

  As described above, according to the sphygmomanometer 10 according to the present embodiment, the substantially U-shaped housing 17 is formed by the substantially parallel plate-like portions 26a and 26b, and the armband is wound as in the related art. It is unnecessary and blood pressure can be measured simply by inserting the wrist A. Basically, it is not necessary to pass the palm between the plate-like portions 26a and 26b, and the space 28 between the plate-like portions 26a and 26b is appropriately narrowed, and the capacity of the second inflating portion 38 can be reduced. it can.

  The air bag 30 is formed at both end portions thereof, and a portion disposed in the opening portion 28a on the side opposite to the closed side forms a retaining inflatable portion 40 that inflates more than near the center, and the wrist A is the space portion 28. Can be prevented from coming off.

  The air bladder 30 has a first inflating portion 36 and a second inflating portion 38 that are not in communication, and the first inflating portion 36 is provided so as to surround the second inflating portion 38 in a state in which the air bladder 30 is deployed. The retaining expansion part 40 is included in the first expansion part 36. According to such a configuration, it is easy to form the retaining expansion part 40. The first inflating part 36 and the second inflating part 38 have an integrated structure and are excellent in assembling.

  Further, a cut 50 is provided between the first inflatable portion 36 and the second inflatable portion 38, and the mutual influence between the inflating preventing portion 40 and the second inflating portion 38 is reduced, and the retaining inflating portion 40 is removed. The second inflatable portion 38 can be arranged to some extent independently at a position suitable for ischemia at a position suitable for the action as a stop.

  On the circuit, by providing the flow path switching valve 84, the pressurizing pump 78 can be shared by the first expansion section 36 and the second expansion section 38. Further, by providing the first exhaust valve 80 and the second exhaust valve 82, the first inflating portion 36 and the second inflating portion 38 can be individually decompressed, and the decompression suitable for the oscillometric method can be performed.

  Next, three modifications of the air bag 30 are shown. In each modification, the same components as those of the air bag 30 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIGS. 11A and 11B, an air bag 30 a according to the first modification is obtained by omitting the cut 50 from the air bag 30. Such an air bag 30a can be configured integrally by partitioning the first inflatable portion 36 and the second inflatable portion 38, the cut line 50 can be omitted, and the shape of the welded portion at the periphery thereof can be simplified and manufactured. Easy. The air bag 30a is applicable to the circuit shown in FIG.

  As shown in FIGS. 12A and 12B, the air bag 30b according to the second modified example has the same outline shape as the air bag 30, but the inside is a space communicating with each other. In the air bag 30b, a Y-direction welded portion 92 is provided at a location corresponding to the two Y-direction cuts 52 (see FIG. 3A). 40, the inner side forms the ischemic part 94. The blood blocking part 94 corresponds to the second expansion part 38. Such an air bag 30b is easy to manufacture because the inside is a communication space, and the procedure of pressurization / decompression is simple, and the first exhaust valve 80 and the flow path switching valve 84 are configured in the circuit shown in FIG. Etc. can be omitted.

  The removal inflating part 40 can be expanded to a certain degree of independence with respect to the ischemic part 94 due to the presence of the Y-direction welded part 92. It is suitable for. Due to the Y-direction welded portion 92, the retaining expansion portion 40 and the blood blocking portion 94 become spaces that are somewhat independent, and it is possible to appropriately prevent the pulse wave from being transmitted to the retaining expansion portion 40 and being attenuated.

  Further, as indicated by phantom lines, the first nozzle 44a and the first tube 46a may be provided in each retaining expansion portion 40 and applied to the same circuit as FIG. Accordingly, it is possible to make it difficult for the wrist A to come off by pressurizing the anti-inflatable portion 40 ahead of the ischemic portion 94.

  As shown in FIGS. 13A and 13B, the air bag 30c according to the third modification has a Y-direction welded portion 92 connected to the peripheral portion as compared with the air bag 30b according to the second modification. The difference is that the two retaining and expanding portions 40 are completely independent of the ischemic portion 94. Each retaining expansion portion 40 is provided with a first nozzle 44a and a first tube 46a. According to such an air bag 30c, it is possible to make it difficult to remove the wrist A by pressurizing the anti-inflatable portion 40 ahead of the ischemic portion 94, and the ischemic portion 94 is the same as the second inflating portion 38 described above. Can be small capacity. By setting the Y-direction welded portion 92 appropriately wide in the X-direction, the retaining expansion portion 40 can be freely arranged to some extent without the influence of the blood blocking portion 94.

  As shown in FIG. 14, in the sphygmomanometer 10, the main body 16 and the armband 12 may be separated and connected by the first tube 46a, the second tube 46b, and a predetermined signal line. The display unit 22 and the operation button 24 may be provided at a position where the housing 17 in the armband 12 is highly visible.

  The housing 17 may be formed by separately forming the plate-like portions 26a and 26b and the connecting portion 26c and connecting them. Alternatively, the connecting portion 26c may be formed by directly connecting the plate-like portion 26a and the plate-like portion 26b. Further, the air bladder 30 may be configured with the first inflating portion 36 and the second inflating portion 38 as separate bodies. Furthermore, the air bag 30 may connect the predetermined part by welding or the like after the first inflating part 36 and the second inflating part 38 are manufactured separately.

  The sphygmomanometer according to the present invention is not limited to the above-described embodiment, and it goes without saying that various configurations can be adopted without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Sphygmomanometer 12 ... Armband 16 ... Main body 17 ... Housing 26a, 26b ... Plate-like part 28 ... Space part 28a ... Opening part 30, 30a-30c ... Air bag 34 ... Inclination part 36 ... 1st expansion part 38 ... 1st 2 expansion part 40 ... prevention expansion part 42 ... passage part 50 ... cut 52 ... cut in Y direction (first direction cut) 54 ... cut in X direction (second direction cut)
86 ... Pressure sensor A ... Wrist

Claims (11)

A housing having a pair of plate-like portions facing each other and a connecting portion that connects one ends of the pair of plate-like portions;
Along the inner surface of the housing, it is folded from one of the plate-like portions at the connecting portion and extends to the other plate-like portion, and is inserted between the pair of plate-like portions. An air bag compressing the forearm of the subject
Pressurizing means for supplying air to the air bag;
A sphygmomanometer, comprising: The sphygmomanometer according to claim 1,
The sphygmomanometer, wherein the housing forms a space portion by a substantially U-shaped inner surface of the pair of plate-like portions and the connecting portion. The sphygmomanometer according to claim 1 or 2,
A sphygmomanometer, wherein at least one of the pair of plate-like portions has an inclined portion that is inclined in a direction in which a distance from the other plate-like portion is narrowed toward an opening on the other end side. The blood pressure monitor according to any one of claims 1 to 3,
The sphygmomanometer, wherein when the forearm is inserted into the housing, the pair of plate-like portions are elastically separated from each other and the opening at the other end is widened. The sphygmomanometer according to any one of claims 1 to 4,
The sphygmomanometer is characterized in that the air bag forms a retaining inflatable portion in which both end portions located on the other end side of the pair of plate-like portions are inflated larger than the vicinity of the center located in the connecting portion. The blood pressure monitor according to claim 5,
The air bag is in a deployed state, and has a first inflating part provided with the retaining inflating part at both ends,
A second inflating portion surrounded by the first inflating portion and not in communication with the first inflating portion;
A sphygmomanometer, comprising: The blood pressure monitor according to claim 6,
The sphygmomanometer, wherein the pressurizing unit supplies air to the second inflating part after supplying air to the first inflating part during blood pressure measurement. The sphygmomanometer according to claim 6 or 7,
Having one or more sensors for detecting the pressure of the first and second inflating portions;
The sphygmomanometer, wherein the pressurizing means makes the pressure of the second expansion part equal to or less than the pressure of the first expansion part during blood pressure measurement. The blood pressure monitor according to claim 5,
The air bag is in a deployed state, and is provided with a first inflating portion including two retaining passages that connect the retaining inflating portions to each other at both ends, and the retaining inflating portions,
A second inflatable portion surrounded by the retaining inflatable portion and the communication path, and not in communication with the first inflatable portion;
A pair of cuts provided between the first inflating part and the second inflating part;
A sphygmomanometer, comprising: The sphygmomanometer according to claim 9,
The pair of cuts are cut in a first direction between the second expansion part and the retaining expansion part,
A second direction cut extending a predetermined length from both ends of the first direction cut toward the central direction between the second expansion part and the passage part;
A sphygmomanometer, comprising: In the sphygmomanometer according to any one of claims 6 to 10,
The pressurizing means includes a pressurizing pump,
A switching valve for switching the flow path from the pressure pump to the first expansion section or the second expansion section;
A first exhaust valve provided in a flow path communicating with the first expansion portion;
A second exhaust valve provided in a flow path communicating with the second expansion portion;
A sphygmomanometer, comprising:

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