TW201328740A - Negative pressure wound care system with buffer unit - Google Patents

Abstract

The invention relates to a negative pressure wound care system with a buffer unit that is disposed between an actuator and a wound dressing. The buffer unit is provided with a physical condition that is similar to the wound site and capable of depleting a negative pressure stored thereof to attain a wound negative pressure compensation, thereby resisting a slightly-increased pressure under a micro leakage condition and enabling the actuator to be indirectly acted on the wound to lessen pains while the patient is in a pressure-releasing condition.

Description

Negative pressure wound care system with buffer unit

The present invention is a negative pressure wound care system with a cushioning unit, and refers to a care system for creating a negative pressure environment within a wound to accelerate wound healing.

Negative Pressure Wound Therapy, which is mainly attached to the wound by a sealing patch, a soft suction cup, or a biocompatible porous material, and is connected to a vacuum pump to form a negative pressure environment in the wound to extract the wound. A negative pressure wound care system has been developed in the prior art for pus and infectious agents, and attracts healthy tissue fluids to maintain a moist therapeutic environment and promote peripheral blood microcirculation to achieve accelerated wound healing.

Referring to FIG. 6, when the prior art negative pressure wound care system operates, the reference value of the pressure feedback control detects the internal pressure of the liquid collecting device 92 at the front end of the actuator 91, or places the detecting point 93 as close as possible to the wound. 94, in order to measure the pressure value closer to the wound 94, and then perform feedback control after the controller 95 receives the signal to determine whether the actuator 91 needs to be restarted to maintain the negative pressure value in the wound 94, thereby ensuring The negative pressure value in the wound 94 can be maintained within a certain range. However, whether the pressure value at the liquid collecting device 92 or the detecting point 93 is still different from the actual pressure value at the wound 94, the actuator is activated. The time point of 91 will be inaccurate.

Furthermore, in the actual use case, the micro-leakage phenomenon caused by the outflow of the wound exudate or the damage of the dressing is quite common, and the negative pressure in the wound is frequently changed. If the controller starts the actuator frequently due to a small amount of negative pressure change, or continues to run at a low speed during voltage regulation to maintain the negative pressure in the wound, it will cause energy loss and increase operating cost; however, if the starting threshold is increased, That is, after accumulating a large pressure difference and then starting the actuator to restore the negative pressure value in the wound, the pressure within the wound will be excessively changed for a short time to cause wound pain.

Moreover, the prior art negative pressure wound care system has further developed a method of connecting the actuator between the liquid collecting device and the wound. At this time, the actuator will directly act on the wound, and the actuator is easy to cause the patient to act. Feel the pain when you lower the pressure.

In view of the foregoing various deficiencies of the prior art, the present invention contemplates a buffer unit that maintains the negative pressure value of the wound in an unactuated state of the actuator and also buffers the wound caused by the actuator when it is activated. The amount of pressure change.

In order to achieve the above object, the present invention provides a negative pressure wound care system with a buffer unit, including a controller, a sensor, an actuator, a liquid collecting device, a wound dressing, and a Responding to the negative pressure change at the wound and providing a buffer unit for negative pressure compensation, the controller is respectively electrically connected with the sensor and the actuator, and the actuator is respectively connected with the buffer unit and the liquid collecting device, the sensor and the buffer The unit is connected and the buffer unit is connected between the wound dressing and the actuator.

The invention has the advantages that the buffer unit can provide negative pressure compensation by consuming the negative pressure itself, so that the wound of the patient can resist the negative pressure micro-liter caused by the leakage or the micro-leakage during the treatment process, and then Since the actuator directly acts on the wound directly on the wound unit, the fluid in the wound is extracted by a gentle decompression method, which can reduce the pain of the patient when the blood pressure is reduced.

The technical means adopted by the present invention for achieving the intended purpose of the invention are further described below in conjunction with the drawings and preferred embodiments of the invention.

Referring to FIGS. 1 and 2, the present invention includes a controller 10, a sensor 20, an actuator 30, a liquid collection device 40, a buffer unit 50, and a wound dressing 60.

The controller 10 is electrically connected to the sensor 20 and the actuator 30 respectively. After the signal of the sensor 20 is transmitted to the controller 10, the controller 10 determines whether to activate the actuator 30. The actuator 10 respectively The buffer unit 50 and the liquid collecting device 40 are connected. In the preferred embodiment, the actuator 10 is connected between the buffer unit 50 and the liquid collecting device 40, and the sensor 20 is connected to the buffer unit 50. The buffer unit 50 is connected. Connected between the wound dressing 60 and the actuator 30.

The buffer unit 50 has physical conditions similar to those of the real wound, and the buffer unit 50 is connected to the wound dressing 60, so that the internal pressure of the real wound can be approximated, so that the sensor 20 can detect the pressure of the buffer unit 50 as a system feedback. The reference value of the control, the buffer unit 50 provides the negative pressure compensation at the wound dressing 60 by immediately consuming the negative pressure of itself.

Referring to FIG. 3, in the preferred embodiment, the buffer unit 50 includes a water absorbing layer 51, a gas permeable layer 52, and a mesh layer 53, wherein the gas permeable layer 52 is connected to the sensor 20, and the water absorbing layer 51 is A polymer foaming material (for example, PVA, Polyvinyl Alcohol polyvinyl alcohol) has a high water absorption ratio and a high volume expansion change characteristic, and its water absorption property is reversible. When the buffer unit 50 is in a negative pressure state, its volume is The drainage exhibits drainage characteristics, and when the negative pressure in the buffer unit 50 disappears, the volume begins to expand to exhibit a strong water absorption capacity to inhale the residual liquid in the pipeline to exhibit water storage characteristics, and the gas permeable layer 52 is a gas permeable, water impermeable material. (For example, PVDF, Polyvinylidene fluoride Teflon), the material property is used to prevent the liquid from flowing into the sensor 20, and the sensor 20 passes through the gas permeable layer 52 to detect the negative pressure change in the buffer unit 50, the mesh layer 53 may be made of polypropylene (PP, Polypropylene), and the inside thereof contains voids. When the buffer unit 50 is in a negative pressure state, the void of the mesh layer 53 simulates the wound tissue, providing a suitable flow passage for the liquid to prevent the whole flow. The buffer unit 50 collapses and locks.

Referring to FIG. 2, when the present invention is used, the wound dressing 60 is used to cover the wound of the patient, and the actuator 30 is activated to pass through the buffer unit 50 to form a negative pressure state at the wound. The sensor 20 detects The negative pressure value at the buffer unit 50 is measured and fed back to the controller 10. The controller 10 determines whether to activate the actuator 30 and then depressurize according to the detected negative pressure value, and the waste liquid of the wound sequentially passes through the wound dressing 60. The buffer unit 50 and the actuator 30 enter the liquid collecting device 40 and are collected.

Referring to FIG. 4, the present invention tests the effect of the buffer unit by using two states of manufacturing pipeline leakage and micro-leakage. In the initial state, the actuator is activated to make the buffer unit pressure -210 mmHg, thereby making the wound pressure. to -150 mmHg, the process was not started after the actuator; T _1. manufacturing line leak maintain a few seconds at a time, this time the pressure rose sharply to close the wound -90mmHg, when the line back to normal after connection, The pressure value of the buffer unit rises slowly to compensate for the negative pressure value of the wound, so that the pressure value at the wound drops to -120 mmHg, and the pressure is raised to a greater extent due to the leakage, so the buffer unit cannot reduce the pressure value at the wound back to the leak. The original value, but the pressure drop caused by the leak can be reduced back; at the time t ₂ and t ₃ , the micro-leakage of the pipeline is maintained for a few seconds, at which time the wound pressure rises slightly to -90 mmHg, when the tube After the road returns to normal, the pressure value of the buffer unit rises slowly to compensate the negative pressure value of the wound, so that the pressure value at the wound drops to -120 mmHg, and the pressure rise is less due to the micro-leakage condition, so the buffer unit can effectively resist Pressure rise caused by the leak, the negative pressure in the wound quickly restored to the value before the vacuum microleakage.

Therefore, through the above experimental data, it can be clearly seen that the setting of the buffer unit can be immediately used as the negative pressure compensation when the wound pressure is changed, so that the buffer unit can be used to resist the exudation of the wound without starting the actuator. Or dressing up the micro-leakage caused by micro-leakage.

Referring to FIG. 5, the present invention utilizes a manual actuator and a valve to manufacture an active negative pressure starting state. In an initial state, the actuator is activated to bring the buffer unit pressure to -180 mmHg, thereby making the wound pressure -80 mmHg; At time t ₄ and t ₆ , the valve is manually opened for a short period of time, so that the pressure value of the buffer unit rises rapidly. At this time, it can be clearly observed that the increase of the wound pressure value is not as large as the buffer unit, and the pressure value of the buffer unit is the same time. -100mmHg to rapidly rise by the proximity 0mmHg wound pressure rises only slowly by the proximity to -70mmHg -30mmHg, at time t _8, even if the valve open time is doubled, the pressure value remains wound slowly rising trend; closing valve After that, at time t ₅ , t ₇ , t ₉ , the actuator is activated to re-depressurize. At this time, it can be clearly observed that the drop of the wound pressure value is not as large as the buffer unit, and the pressure of the buffer unit is the same time. The value decreased from 0 mmHg to -210 mmHg, but the wound pressure value decreased only from approximately -30 mmHg to -60 mmHg and remained stable.

Therefore, it can be clearly seen from the above experimental data that since the lifting and lowering action performed by the actuator directly acts on the buffer unit and indirectly balances the wound pressure through the buffer unit, the buffer unit can effectively buffer the impact of the lifting pressure on the wound. The lifting pressure is performed with a gentle hand, thereby reducing the pain of the patient during the blood pressure reduction of the wound.

The above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the invention, and A person skilled in the art can make some modifications or modifications to equivalent embodiments by using the above-disclosed technical contents without departing from the technical scope of the present invention. The present invention is not limited to any simple modifications, equivalent changes and modifications of the above embodiments.

10. . . Controller

20. . . Sensor

30. . . Actuator

40. . . Liquid collection device

50. . . Buffer unit

51. . . Water absorption layer

52. . . Breathable layer

53. . . Mesh layer

60. . . Wound dressing

91. . . Actuator

92. . . Liquid collection device

93. . . Detection point

94. . . wound

95. . . Controller

Figure 1 is a schematic view of the components of the present invention.

Figure 2 is a schematic view of the structure of the present invention.

Figure 3 is an exploded view of the buffer unit of the present invention.

Figure 4 is a graph showing the pressure change of the leak and microleak test of the present invention.

Figure 5 is a pressure change diagram of the present invention for manually opening the valve and starting the actuator.

Figure 6 is a schematic view of the structure of the prior art.

10. . . Controller

20. . . Sensor

30. . . Actuator

40. . . Liquid collection device

50. . . Buffer unit

60. . . Wound dressing

Claims (10)

A negative pressure wound care system with a buffer unit, comprising a controller, a sensor, an actuator, a liquid collecting device, a wound dressing, and a negative pressure change for responding to the wound and providing a negative pressure The compensation buffer unit is respectively electrically connected with the sensor and the actuator, the actuator is respectively connected with the buffer unit and the liquid collecting device, the sensor is connected with the buffer unit, and the buffer unit is connected to the wound dressing and the Between the actuators. The negative pressure wound care system with a buffer unit according to claim 1, wherein the buffer unit comprises a water absorbing layer, a gas permeable layer and a mesh layer, and the volume of the water absorbing layer is drainage when compressed, and the water absorbing when the volume is expanded. Characteristic, the gas permeable layer is connected to the sensor, and the mesh layer contains voids inside. The negative pressure wound care system with a buffer unit according to claim 2, wherein the water absorbing layer is made of a polymer foaming material. A negative pressure wound care system having a buffer unit according to claim 2 or 3, wherein the mesh layer is made of polypropylene. A negative pressure wound care system having a buffer unit according to claim 2 or 3, wherein the gas permeable layer is made of polyvinylidene fluoride. The negative pressure wound care system with a buffer unit according to claim 4, wherein the gas permeable layer is made of polyvinylidene fluoride. The negative pressure wound care system with a buffer unit according to any one of claims 1 to 3, wherein the actuator is coupled between the buffer unit and the liquid collecting device. The negative pressure wound care system of claim 4, wherein the actuator is coupled between the buffer unit and the liquid collection device. The negative pressure wound care system of claim 5, wherein the actuator is coupled between the buffer unit and the liquid collection device. The negative pressure wound care system of claim 6, wherein the actuator is coupled between the buffer unit and the liquid collection device.