JP5629155B2 - Negative pressure therapy device - Google Patents

Description

  The present invention relates to a negative pressure treatment device.

  Conventionally, as a negative pressure treatment device, a treatment device that aspirates body fluid exuding from a wound part and discharges it from the inside of the cover sheet while keeping the inside of the cover sheet covering the wound part such as skin ulcer or tissue defect in a negative pressure state Is known (for example, see Patent Documents 1 and 2 below).

  According to such a negative pressure treatment device, necrotic cells, bacteria, and the like can be sucked and removed from the wound part, and blood flow in the wound part can be promoted by the negative pressure to enhance the therapeutic effect. Moreover, intermittent negative pressure is given with respect to a wound part by driving a suction pump intermittently using a relief valve (opening-closing valve). Thereby, moderate irritation | stimulation is given to a wound part and formation of the granulation tissue which promotes healing of a wound part is accelerated | stimulated.

Japanese Patent No. 4068807 Japanese Patent No. 3859085

  By the way, if the height of the wound part is relatively displaced during the treatment by the negative pressure treatment device, the pressure value inside the covering sheet covering the wound part also changes. For this reason, it has been difficult for the conventional negative pressure treatment device to keep the pressure value inside the covering sheet constant.

  Moreover, in the conventional negative pressure treatment apparatus, the pressure value inside the coating sheet is adjusted by controlling the operations of the suction pump and the relief valve. However, the conventional negative pressure treatment device only returns the pressure inside the covering sheet in the over negative pressure state to the atmospheric pressure, and adjusts the pressure value inside the covering sheet in the over negative pressure state. I couldn't do it.

  The present invention has been made in view of such circumstances, and enables adjustment of the pressure value inside the covering sheet in the over negative pressure state, and keeps the inside of the covering sheet at a desired pressure value. An object of the present invention is to provide a negative pressure treatment device capable of performing the above-described problem.

  The present invention relates to a negative pressure treatment device that discharges fluid from the inside of the covering sheet while keeping the inside of the covering sheet covering the wound part in a negative pressure state, and measures the pressure inside the covering sheet Means, a storage container that stores the fluid through a first flow path that communicates with the inside of the covering sheet, and a first flow path that sucks air in the storage container through a second flow path that communicates with the storage container. A suction means for sucking fluid from the inside of the covering sheet, and a supply means for supplying air into the storage container through a third flow path communicating with the storage container.

  The negative pressure treatment apparatus of the present invention may include a flow path switching unit that switches between the second flow path and the third flow path.

  The negative pressure treatment device of the present invention includes the suction means and the supply means, and is provided in the second flow path and the suction supply means in which the second flow path and the third flow path are connected. When the air is supplied into the storage container through the third flow path, the flow path communicating with the storage container in the second flow path is shut off and communicated with the suction supply means of the second flow path. A first on-off valve that opens the flow path to the atmosphere and the third flow path, and when the air is sucked from the storage container through the second flow path, And a second on-off valve that shuts off the flow path communicating with the second flow path and opens the flow path communicating with the suction supply means of the third flow path to the atmosphere.

  Moreover, the negative pressure treatment apparatus of the present invention is characterized in that the supply means supplies air to the inside of the covering sheet through a fourth flow path communicating with the inside of the covering sheet.

  The negative pressure treatment device of the present invention includes the suction means and the supply means, and is provided in the second flow path and the suction supply means in which the second flow path and the third flow path are connected. When the air is supplied to the inside of the covering sheet through the fourth flow path, the flow path communicating with the storage container of the second flow path is blocked, and the suction supply means of the second flow path A first on-off valve that opens the communicating flow path to the atmosphere; and the covering sheet of the fourth flow path that is provided in the fourth flow path and sucks air from within the container through the second flow path. And a third on-off valve that shuts off the flow path that communicates with the inside and opens the flow path that communicates with the suction supply means of the fourth flow path to the atmosphere.

  The negative pressure treatment device of the present invention may include second flow path switching means for switching between the fourth flow path and a flow path communicating with the inside of the covering sheet.

  Furthermore, the negative pressure treatment device of the present invention is characterized in that the fluid includes a cleaning liquid for cleaning the wound part, and includes a supply flow path for supplying the cleaning liquid to the inside of the covering sheet.

  According to the negative pressure treatment device of the present invention, a desired pressure can be applied to the inside of the covering sheet through the third flow path, the container, and the first flow path by driving the supply means. For this reason, even if it is a case where the inside of a covering sheet will be in a negative pressure state, the drive value of a supply means can be controlled and the pressure value inside a covering sheet can be adjusted. Thereby, the inner side of the covering sheet whose pressure state changes can be maintained at a desired pressure value.

  According to the negative pressure treatment device of the present invention, by providing the flow path switching means, the second flow path serving as the flow path of the air sucked from the storage container, and the flow of air supplied into the storage container The 3rd flow path used as a path | route can be switched reliably. By switching each flow path reliably, the driving efficiency of the suction means and the supply means is improved, and the pressure value inside the cover sheet can be controlled with higher accuracy.

  According to the negative pressure treatment device of the present invention, the negative pressure treatment device can be downsized by using the suction supply means including the suction means and the supply means. At that time, by controlling the opening / closing operation of the first on-off valve provided in the second flow path and the second on-off valve provided in the third flow path, the air flow in each flow path is maintained in the correct direction. Be drunk. Since the negative pressure treatment device is miniaturized, handling is facilitated, and the burden on the patient when worn or moved is reduced.

  Further, according to the negative pressure treatment device according to the present invention, the supply means is configured to supply air to the inside of the covering sheet through the fourth flow path leading to the inside of the covering sheet, thereby allowing the first container to communicate with the storage container. It becomes unnecessary to apply a desired pressure to the inside of the covering sheet through one flow path. As a result, the fluid already sucked from the inside of the covering sheet and remaining in the first flow path (drainage fluid including body fluid exuding from the wound part) is applied to the inside of the covering sheet by the pressure applied to the inside of the covering sheet. Backflowing inward can be prevented. Further, since the air is directly supplied to the inside of the cover sheet by the supply means, the pressure value can be adjusted quickly.

  According to the negative pressure treatment device of the present invention, the above-described suction supply means is employed in the negative pressure treatment device configured to supply air to the inside of the covering sheet through the fourth channel. All effects can be obtained.

  According to the negative pressure treatment device according to the present invention, in addition to the above-described effects, the number of tubes and the like to be drawn inside the covering sheet can be reduced. For this reason, generation | occurrence | production of the sealing failure of a covering sheet, peeling, abnormal leak of air, etc. can be suppressed.

  Furthermore, according to the negative pressure treatment apparatus according to the present invention, by providing the supply flow path for supplying the cleaning liquid to the inside of the covering sheet, the wound part can be cleaned with the cleaning liquid, and infectious diseases and the like can be prevented. In addition, by keeping the wound part being treated with the washing liquid in a wet state at all times, exudation of body fluid can be promoted and the therapeutic effect of the wound part can be improved.

1 is a schematic overall view showing a negative pressure treatment apparatus according to a first embodiment of the present invention. It is a schematic sectional drawing which shows the inner side of the coating sheet which covers a wound part. It is a schematic whole figure which shows the modification of the negative pressure treatment apparatus which concerns on 1st Embodiment of this invention. It is a schematic whole view which shows the other modification of the negative pressure treatment apparatus which concerns on 1st Embodiment of this invention. It is a schematic whole figure which shows the negative pressure treatment apparatus which concerns on 2nd Embodiment of this invention. It is a schematic whole figure which shows the modification of the negative pressure treatment apparatus which concerns on 2nd Embodiment of this invention. It is a schematic whole figure which shows the other modification of the negative pressure treatment apparatus which concerns on 2nd Embodiment of this invention. It is a schematic whole figure which shows the negative pressure treatment apparatus which concerns on 3rd Embodiment of this invention. It is a schematic sectional drawing which shows the inner side of the coating sheet which covers a wound part.

  Hereinafter, embodiments of a negative pressure treatment apparatus according to the present invention will be described with reference to the drawings. In the present specification, each drawing is schematically shown, and when the same reference numeral is given, the same configuration is shown. In this specification, “negative pressure” means a pressure lower than the atmospheric pressure outside the covering sheet, and “negative pressure state” means that the pressure inside the covering sheet is the pressure outside the covering sheet (atmospheric pressure). ) Means a lower state. In addition, the solid line arrow shown in each figure shall show the flow of the fluid when driving a suction means. Moreover, the dotted line arrow shown by each figure shall show the flow of the fluid when driving a supply means.

  As shown in FIG. 1, the negative pressure treatment device 10 according to the first embodiment includes a pressure measuring unit 1 that measures the pressure inside the covering sheet S, and a housing that contains fluid discharged from the inside of the covering sheet S. A container 2, a suction unit 3 that sucks air in the storage container 2 and sucks fluid from the inside of the covering sheet S, and a supply unit 4 that supplies air into the storage container 2 are provided. The negative pressure treatment device 10 discharges fluid (air and body fluid exuded from the wound part W) from the inside of the covering sheet S while keeping the inside of the covering sheet S covering the wound part W in a negative pressure state.

  As shown in FIG. 2, the wound part W is provided with a porous pad P that is permeable to air and fluid such as body fluid that has exuded from the wound part W, and covers the wound part W and the pad P. Sheet S is stuck. Inside the covering sheet S covering the wound portion W, open end portions of a plurality of flexible tubes are drawn, and one tube constitutes a part of the first flow path 11 and the other tube measures pressure. The tube 8 is configured.

  The pressure measuring means 1 includes a pressure sensor 9 connected to a pressure measuring tube 8 that leads to the inside of the covering sheet S, and measures the pressure inside the covering sheet S. In the present embodiment, a stainless diaphragm pressure sensor is employed as the pressure sensor 9, and the pressure value inside the covering sheet S is measured through the pressure measurement tube 8. The pressure value measured by the pressure measuring unit 1 is transmitted to a control unit (not shown). The pressure measuring tube 8 has an open end directly drawn inside the covering sheet S, but may be formed by branching from the first flow path 11. As the pressure measuring means 1, for example, another pressure sensor such as a silicon diaphragm type pressure sensor can be adopted.

  The storage container 2 is detachably connected to the first flow path 11 that communicates with the inside of the covering sheet S, and stores fluid (air and body fluid exuded from the wound part W) inside the first flow path 11. . The container 2 is also detachably connected to a second flow path 12 and a third flow path 13 described later. In order to prevent the fluid (the body fluid exuded from the wound part W) already contained in the storage container 2 from entering each of the flow paths 11 to 13, the connection portion with each of the flow paths 11 to 13 2 is provided at the upper part.

  When the inside of the container 2 is filled with fluid (body fluid that has exuded from the wound part W), it is necessary to replace the container 2 with another one or to discharge the fluid from the inside of the container 2. For this reason, it is desirable that the storage container 2 is formed using a transparent material such as glass or transparent resin so that the inside is visible. You may provide the liquid level detection sensor which detects the liquid level of the fluid (Body fluid which exuded from the wound part W) in the storage container 2. FIG. Or these can also be employ | adopted simultaneously.

  The suction means 3 is connected to the second flow path 12 that communicates with the inside of the storage container 2, and sucks the air in the storage container 2 through the second flow path 12. In the present embodiment, a diaphragm type vacuum pump is employed as the suction means 3, and the inside of the covering sheet S is covered through the first flow path 11 while keeping the inside of the covering sheet S in a negative pressure state by reducing the pressure inside the container 2. Fluid (air and fluid exuding from the wound part W) is sucked from the inside of the sheet S. Further, the driving of the suction unit 3 is electronically controlled by a control unit (not shown) according to the pressure value measured by the pressure measurement unit 1. In addition, as the suction means 3, other pumps, such as a tube pump and a vane pump, can also be employ | adopted, for example. As the second flow path 12, for example, a flexible tube having no air leak is used.

  The supply means 4 is connected to a third flow path 13 communicating with the inside of the storage container 2, and supplies air into the storage container 2 through the third flow path 13. In the present embodiment, a diaphragm type air pump is adopted as the supply unit 4, and pressure is applied to the inside of the covering sheet S through the first flow path 11 by pressurizing the inside of the container 2. Further, the driving of the supply unit 4 is electronically controlled by a control unit (not shown) according to the pressure value measured by the pressure measurement unit 1. In addition, as the supply means 4, other pumps, such as a tube pump, a vane pump, a piston pump, can also be employ | adopted, for example. As the third flow path 13, for example, a flexible tube having no air leak is used.

  When the wound part W is treated using the negative pressure treatment device 10 according to the present embodiment, for example, the position of the wound part W, the state of the wound part W, or the degree of recovery of the wound part W due to past treatment, etc. The operation setting of the negative pressure treatment apparatus 10 (for example, the operation time, the setting of the pressure value inside the covering sheet S, etc.) differs depending on the patient. If the determination of the operation setting is wrong, not only the desired therapeutic effect cannot be obtained, but conversely, the healing of the wound part W may be delayed or the symptoms of the wound part W may be worsened.

  For this reason, before the wound part W is treated using the negative pressure treatment device 10, a medical examination is always performed, and the negative pressure treatment device 10 operates based on an operation setting prescribed by the doctor. Hereinafter, the operation and control of the negative pressure treatment apparatus 10 will be described in detail.

  First, as a preliminary preparation before operating the negative pressure treatment apparatus 10, the wound portion W is covered with the covering sheet S, and operation setting based on a doctor's prescription is performed. After the preparation is completed, the negative pressure treatment device 10 starts a predetermined operation.

  First, the suction unit 3 is driven until the pressure value indicated by the pressure measuring unit 1 (that is, the pressure value inside the covering sheet S) reaches the set pressure value. When the suction means 3 is driven, the inside of the container 2 is depressurized and a negative pressure is generated inside the covering sheet S. When the pressure value indicated by the pressure measuring means 1 reaches a predetermined pressure value, a signal is transmitted to the control means, and the driving of the suction means 3 is stopped. Even if the suction means 3 is stopped, the inside of the covering sheet S is maintained in a desired negative pressure state for a while. When the pressure value inside the covering sheet S exceeds a certain value, the suction means 3 is driven again by a signal from the control means. In this way, the driving of the suction means 3 is electronically controlled so that the inside of the covering sheet S is maintained in a desired negative pressure state.

  Here, if the height of the wound portion W that is being treated is displaced relative to a predetermined reference position (for example, the container 2), the pressure in the first flow path 11 changes. This change in pressure is considered to be caused by a change in the potential energy of the fluid due to the inclination of the first flow path 11. If the pressure in the 1st flow path 11 changes, a change will arise also in the pressure state inside the coating sheet S which covers the wound part W. FIG.

  For example, if the height of the wound part W is displaced to a position lower than the reference position, the inside of the covering sheet S may be in a normal pressure or positive pressure state. When the inside of the covering sheet S is in a normal pressure or positive pressure state, body fluid or the like exuding from the wound part W cannot be sucked well, and a desired therapeutic effect cannot be obtained. In such a case, the drive speed of the suction means 3 is increased by the control means, and a negative pressure is generated inside the covering sheet S. Thereby, while preventing that the inner side of the coating sheet S will be in a normal pressure or a positive pressure state, it adjusts so that the inner side of the coating sheet S may become the set pressure value.

  On the other hand, if the height of the wound part W is displaced to a position higher than the reference position, the inside of the covering sheet S may be in a negative pressure state. If the inside of the covering sheet S is in a negative pressure state, the amount of bleeding from the wound portion W may be increased, or the wound portion W may be damaged and the symptoms may be worsened. In such a case, the supply means 4 is driven by the control means to supply air into the container 2 and apply pressure to the inside of the covering sheet S. Thus, the inside of the cover sheet S is prevented from being in a negative pressure state, and the inside of the cover sheet S is adjusted to a set pressure value.

  The driving of the suction means 3 and the supply means 4 is electronically controlled by the control means based on the pressure value indicated by the pressure measuring means 1. Whether the change in the pressure value inside the covering sheet S is due to the displacement of the height of the wound portion W or whether it is due to a sealing failure of the covering sheet S or abnormal air leakage due to peeling or the like is determined by the control means. The determination is made as follows. For example, a threshold value is set for the differential pressure from the set pressure value, and when the threshold value is exceeded, it is determined that the change in the pressure value inside the covering sheet S is due to the displacement of the height of the wound portion W. . A threshold may be set for the elapsed time after the pressure value has changed.

  Thus, the negative pressure treatment apparatus 10 according to the present embodiment keeps the inside of the covering sheet S covering the wound part W in a desired negative pressure state, while fluid (exuded from the air and the wound part W) from the inside of the covering sheet S. Drained body fluid). The fluid discharged from the inside of the cover sheet S is sucked through the first flow path 11 and stored in the storage container 2.

  According to the negative pressure treatment apparatus 10 according to the present embodiment, by driving the supply unit 4, a desired pressure is applied to the inside of the covering sheet S through the third flow path 13, the container 2, and the first flow path 11. Can be given. For this reason, even if the inside of the covering sheet S is in a negative pressure state, the drive of the supply means 4 can be controlled to adjust the pressure value inside the covering sheet S. Moreover, the pressure value inside the covering sheet S can be adjusted by electronically controlling the driving of the suction means 3 and the supply means 4 based on the pressure value indicated by the pressure measuring means 1. Thereby, the inside of the coating sheet S in which a pressure state changes under the influence of atmospheric pressure can be maintained at a desired pressure value.

  Moreover, according to the negative pressure treatment apparatus 10 which concerns on this embodiment, even if it is a case where the inner side of the coating sheet S will be in a negative pressure state, the pressure value inside the coating sheet S can be adjusted. This reduces the burden of medical personnel such as doctors and nurses to constantly watch the patient being treated to prevent accidents caused by excessive negative pressure. At the same time, it is possible to provide a negative pressure treatment device that can move freely without restraining the patient even during treatment. Thereby, while ensuring the safety when the patient is not watched by the medical staff, the stress of the patient under treatment can be reduced.

  The negative pressure treatment apparatus 10 according to the first embodiment of the present invention has been described above, but the negative pressure treatment apparatus according to the present invention can be implemented in other forms.

  For example, an embodiment like the negative pressure treatment apparatus 20 shown in FIG. 3 may be used as a modification of the first embodiment. The negative pressure treatment device 20 includes a channel switching means 5 that switches between the second channel 12 and the third channel 13. In the present embodiment, the channel switching means 5 is provided at the connection portion between the second channel and the third channel.

  The flow path switching means 5 shuts off the third flow path 13 leading to the second flow path 12 when the air in the storage container 2 is sucked through the second flow path 12, and passes through the third flow path 13 in the storage container 2. The third flow path 13 is opened to the second flow path 12 when the air is supplied to the second flow path 12, and the third flow path 13 is communicated with the container 2. The operation of the flow path switching unit 5 is electronically controlled by a control unit (not shown) according to the driving of the suction unit 3 and the supply unit 4.

  According to the negative pressure treatment device 20, by providing the flow path switching means 5, the second flow path 12 serving as a flow path for air sucked from the storage container 2 and the air supplied to the storage container 2 The third flow path 13 that becomes the flow path can be switched reliably. By switching each flow path reliably, the driving efficiency of the suction means 3 and the supply means 4 can be improved, and the pressure value inside the covering sheet S can be controlled with higher accuracy.

  Moreover, an embodiment like the negative pressure treatment apparatus 30 shown in FIG. 4 may be used as another modification of the first embodiment. The negative pressure treatment device 30 includes a suction supply means 7 including a suction means 3 and a supply means 4, a first on-off valve 31 provided in the second flow path 12, and a second open / close provided in the third flow path. And a valve 32.

  The suction supply unit 7 sucks air in the storage container 2 and supplies air into the storage container 2. In this embodiment, a diaphragm-type supply / discharge pump is adopted as the suction supply means 7, and the suction pump (suction means 3) and the supply pump (supply means 4) are integrally formed. The suction supply means 7 includes a second flow path 12 connected to the suction means 3 and a third flow path 13 connected to the supply means 4 connected by a connecting portion 71. 13 communicate with each other.

  The first on-off valve 31 shuts off the second flow path 12 and opens it to the atmosphere. In the present embodiment, a relief valve is employed as the first on-off valve 31, and communicates with the inside of the container 2 of the second channel 12 when air is supplied into the container 2 through the third channel 13. The flow path is blocked, and the flow path communicating with the suction supply means 7 of the second flow path 12 is opened to the atmosphere. The air supplied by the supply means 4 is taken into the second flow path from the atmosphere and sent to the supply means 4 through the connection portion 71. At this time, in order to prevent bacteria from entering the second flow path 12 from the atmosphere, it is preferable to provide a waterproof and moisture permeable filter (not shown) in the atmosphere opening portion of the first on-off valve 31. . Note that other valves such as a check valve may be employed as the first on-off valve 31.

  The second on-off valve 32 blocks the third flow path 13 and opens it to the atmosphere. In the present embodiment, a relief valve is employed as the second on-off valve 32, and communicates with the inside of the container 2 of the third channel 13 when air is sucked from the inside of the container 2 through the second channel 12. The flow path is blocked, and the flow path communicating with the suction supply means 7 of the third flow path 13 is opened to the atmosphere. The air sucked by the suction means 3 is sent to the supply means 4 through the connection portion 71, and is exhausted from the atmosphere opening portion of the second on-off valve 32 to the outside of the third flow path 13. At this time, in order to prevent bacteria from entering the third flow path 13 from the atmosphere, it is preferable to provide a waterproof and moisture permeable filter (not shown) in the atmosphere opening portion of the second on-off valve 32. . Note that other valves such as a check valve may be employed as the second on-off valve 32.

  The opening / closing operations of the first opening / closing valve 31 and the second opening / closing valve 32 are electronically controlled by a control means (not shown). These opening / closing operations are controlled to perform operations opposite to each other in accordance with the driving of the suction means 3 and the supply means 4 provided in the suction supply means 7. That is, when the suction means 3 is driven, the first on-off valve 31 is closed and the second on-off valve 32 is open. On the contrary, when the supply means 4 is driven, the first on-off valve 31 is open and the second on-off valve 32 is closed.

  According to the negative pressure treatment device 30, the main body of the negative pressure treatment device 30 can be reduced in size by using the suction supply means 7 including the suction means 3 and the supply means 4. At that time, by controlling the opening / closing operation of the first on-off valve 31 provided in the second flow path 12 and the second on-off valve 32 provided in the third flow path 13, the air flow in each flow path is controlled. Kept in the right direction. Since the main body of the negative pressure treatment device 30 is reduced in size, handling is facilitated, and the burden on the patient at the time of wearing or moving can be reduced.

  Furthermore, in the negative pressure treatment device 30, a flow path switching unit 5 that switches between the second flow path 12 and the third flow path 13 may be provided as necessary. Thereby, the pressure value inside the covering sheet S can be controlled with higher accuracy.

  Moreover, an embodiment like the negative pressure treatment apparatus 40 shown in FIG. 5 may be used as the second embodiment. The negative pressure treatment device 40 is characterized in that the supply means 4 supplies air to the inside of the covering sheet S through the fourth passage 14 communicating with the inside of the covering sheet S instead of the third passage 13 described above. Yes. As the fourth flow path 14, for example, a flexible tube without air leak is used.

  According to the negative pressure treatment device 40, since the supply unit 4 is configured to supply air to the inside of the covering sheet S through the fourth flow path 14, the covering is performed through the first flow path 11 leading to the storage container 2. It is not necessary to apply a desired pressure to the inside of the sheet S. Thereby, the pressure (fluid containing the bodily fluid exuded from the wound part W) already sucked from the inside of the covering sheet S and remaining in the first flow path 11 is applied to the inside of the covering sheet S. Therefore, it is possible to prevent backflow to the inside of the covering sheet S. Further, since the air is directly supplied to the inside of the covering sheet S by the supply means 4, the pressure value can be adjusted more quickly.

  Further, as a modification of the second embodiment, an embodiment such as a negative pressure treatment device 50 shown in FIG. 6 may be used. The negative pressure treatment device 50 includes a suction supply means 7a including the suction means 3 and the supply means 4, a first open / close valve 31 provided in the second flow path 12, and a third open / close provided in the fourth flow path. And a valve 33. In addition, since the 1st on-off valve 31 is the same as the above-mentioned structure, description is abbreviate | omitted in this embodiment.

  The suction supply means 7a performs suction of air in the storage container 2 and supply of air to the inside of the covering sheet S. In this embodiment, a diaphragm type supply / discharge pump is employed as the suction supply means 7a, and the suction pump (suction means 3) and the supply pump (supply means 4) are integrally formed. The suction supply means 7a includes a second flow path 12 connected to the suction means 3 and a fourth flow path 14 connected to the supply means 4 connected by a connecting portion 71. 14 communicate with each other.

  The third on-off valve 33 shuts off the fourth flow path 14 and opens it to the atmosphere. In the present embodiment, a relief valve is employed as the third on-off valve 33, and communicates with the inside of the covering sheet S of the fourth flow path 14 when air is sucked from the storage container 2 through the second flow path 12. The flow path that communicates with the suction supply means 7a of the fourth flow path 14 is opened to the atmosphere. The air sucked by the suction means 3 is sent to the supply means 4 through the connection portion 71 and exhausted from the atmosphere opening portion of the third on-off valve 33 to the outside of the fourth flow path 14. At this time, in order to prevent bacteria from entering the fourth flow path 14 from the atmosphere, it is preferable to provide a waterproof and moisture permeable filter (not shown) in the atmosphere opening portion of the third on-off valve 33. . Note that other valves such as a check valve may be employed as the third on-off valve 33.

  The opening / closing operations of the first opening / closing valve 31 and the third opening / closing valve 33 are electronically controlled by a control means (not shown). These opening / closing operations are controlled so as to perform operations opposite to each other in accordance with the driving of the suction means 3 and the supply means 4 provided in the suction supply means 7a. That is, when driving the suction means 3, the first on-off valve 31 is closed and the third on-off valve 33 is open. On the contrary, when the supply means 4 is driven, the first on-off valve 31 is open and the third on-off valve 33 is closed.

  According to the negative pressure treatment device 50, by adopting the suction supply means 7a to the negative pressure treatment device 40 configured to supply air to the inside of the covering sheet S through the fourth flow path 14, all the above-described An effect can be obtained.

  Further, as another modified example of the second embodiment, an embodiment such as a negative pressure treatment device 60 shown in FIG. 7 may be used. The negative pressure treatment device 60 includes second flow path switching means 6 that switches between the fourth flow path 14 and the flow path communicating with the inside of the covering sheet S. In the present embodiment, the second flow path switching means 6 is provided at the connection portion between the fourth flow path 14 and the pressure measurement tube 8.

  The second flow path switching means 6 opens the fourth flow path 14 to the flow path in the pressure measurement tube 8 only when air is supplied to the inside of the covering sheet S through the fourth flow path 14, The path 14 is communicated with the inside of the covering sheet S. At other times, the flow path leading to the pressure measurement tube 8 in the fourth flow path 14 is blocked, and the pressure sensor 9 measures the pressure inside the covering sheet S through the pressure measurement tube 8. The operation of the second flow path switching unit 6 is electronically controlled by a control unit (not shown) according to the driving of the suction unit 3 and the supply unit 4.

  According to the negative pressure treatment device 60, air is directly supplied to the inside of the covering sheet S, similarly to the negative pressure treatment devices 40 and 50 described above, and therefore, backflow of fluid to the inside of the covering sheet S is prevented. The pressure value can be adjusted more quickly. In addition, since the number of tubes and the like drawn into the inside of the covering sheet S can be reduced, it is possible to suppress the occurrence of defective sealing, peeling, abnormal air leakage, and the like of the covering sheet S.

  Further, an embodiment like the negative pressure treatment device 70 shown in FIG. 8 may be used as the third embodiment. The negative pressure treatment device 70 includes a supply flow path 15 in which the fluid discharged from the inside of the covering sheet S includes a cleaning liquid for cleaning the wound portion W, and supplies the cleaning liquid to the inside of the covering sheet S. .

  As shown in FIG. 9, the wound part W is provided with a porous pad P that is permeable to fluids such as air and fluid exuding from the wound part W, and covers the wound part W and the pad P. Sheet S is stuck. Inside the covering sheet S covering the wound portion W, open end portions of a plurality (three) of flexible tubes are drawn. Of these (three) tubes, one tube forms part of the first flow path 11, the other tube forms part of the supply flow path 15, and the other tube is a pressure measurement tube. 8 is configured.

  The supply flow path 15 has one end connected to the cleaning liquid bag B and the other end connected to the container 2, and constitutes a flow path for supplying the cleaning liquid to the inside of the covering sheet S. As the supply channel 15, for example, a flexible tube without air leak is used. Moreover, as a washing | cleaning liquid, what added the required chemical | medical agent etc. to the physiological saline and physiological saline can be used, for example.

  The cleaning liquid supplied to the inside of the covering sheet S through the supply channel 15 is discharged from the inside of the covering sheet S as a fluid together with the body fluid that exudes from the wound portion W. The discharged fluid (such as cleaning fluid and body fluid exuding from the wound portion W) is stored in the storage container 2 through the first flow path 11.

  According to the negative pressure treatment device 70, by providing the supply flow path 15 for supplying the cleaning liquid to the inside of the covering sheet S, the wound part W can be cleaned with the cleaning liquid and infectious diseases and the like can be prevented. Moreover, the wound part W currently being treated with the cleaning liquid is always kept in a wet state, so that the exudation of body fluid can be promoted and the therapeutic effect of the wound part W can be improved.

  In addition, embodiment provided with this supply flow path 15 can be employ | adopted also with respect to the negative pressure therapy apparatus 10-60 which concerns on all the above-mentioned embodiments, and the same effect as the above-mentioned negative pressure therapy apparatus 70. Can be obtained.

  The negative pressure treatment device of the present invention is not limited to the above embodiment. For example, you may provide the height detection sensor which detects the relative displacement of the height of the wound part W with respect to a fixed reference position. When the control means performs a predetermined calculation based on the signal detected by the height detection sensor, the pressure value inside the covering sheet S that changes with the displacement of the height of the wound portion W can be predicted. Thereby, the adjustment speed of the pressure value inside the covering sheet S can be increased, and the change of the pressure value inside the covering sheet S due to the displacement of the height of the wound portion W can be reduced.

  Alternatively, a lumen tube in which the internal space is divided into a plurality of channels may be used as the first channel 11, the second channel 12, the third channel 13, or the fourth channel 14. By connecting the respective flow paths into a single lumen tube, connection to the respective flow paths such as the container 2, the suction means 3, and the supply means 4 becomes easy. Further, it is possible to prevent an accident in which any of the flow paths is accidentally hooked on some obstacle while the patient is moving.

  It should be noted that the present invention can be implemented in a mode in which various improvements, modifications, or variations are added based on the knowledge of those skilled in the art without departing from the spirit of the present invention. Moreover, you may implement with the form which substituted any invention specific matter to the other technique within the range which the same effect | action or effect produces.

DESCRIPTION OF SYMBOLS 10, 20, 30, 40, 50, 60, 70 Negative pressure treatment apparatus 1 Pressure measuring means 2 Storage container 3 Suction means 4 Supply means 5 Flow path switching means 6 Second flow path switching means 7, 7a Suction supply means 11 1st flow path 12 2nd flow path 13 3rd flow path 14 4th flow path 15 Supply flow path 31 1st on-off valve 32 2nd on-off valve 33 3rd on-off valve W Wound part S Covering sheet

Claims (7)

A negative pressure treatment device that discharges fluid from the inside of the covering sheet while keeping the inside of the covering sheet covering the wound part in a negative pressure state,
Pressure measuring means for measuring the pressure inside the covering sheet;
A storage container for storing the fluid through a first flow path leading to the inside of the covering sheet;
Suction means for sucking air in the storage container through the second flow path communicating with the storage container, and sucking fluid from the inside of the covering sheet through the first flow path;
Supply means for supplying air into the storage container through a third flow path communicating with the storage container ;
Control means for controlling the driving of the suction means and the supply means so that the inside of the covering sheet is maintained in a desired negative pressure state based on the pressure value measured by the pressure measuring means;
A negative pressure treatment device comprising:   The negative pressure treatment device according to claim 1, further comprising a flow path switching unit that switches between the second flow path and the third flow path. A suction supply means including the suction means and the supply means, wherein the second flow path and the third flow path are connected;
The second flow path is provided in the second flow path, and when the air is supplied into the storage container through the third flow path, the flow path communicating with the storage container in the second flow path is blocked, and the second flow path A first on-off valve for opening a flow path communicating with the suction supply means to the atmosphere;
The third flow path is provided in the third flow path and shuts off the flow path communicating with the storage container of the third flow path when air is sucked from the storage container through the second flow path. A second on-off valve for opening a flow path communicating with the suction supply means to the atmosphere;
The negative pressure treatment device according to claim 1, wherein the negative pressure treatment device is provided. 2. The negative pressure according to claim 1, wherein the supply unit supplies air to the inside of the cover sheet through a fourth flow path leading to the inside of the cover sheet instead of the third flow path. Therapeutic device. A suction supply means including the suction means and the supply means, wherein the second flow path and the fourth flow path are connected;
Provided in the second flow path and shuts off the flow path communicating with the inside of the container of the second flow path when supplying air to the inside of the covering sheet through the fourth flow path, A first on-off valve for opening a flow path communicating with the suction supply means of the path to the atmosphere;
Provided in the fourth flow path, shuts off a flow path communicating with the inside of the covering sheet of the fourth flow path when air is sucked from the container through the second flow path; A third on-off valve for opening the flow path communicating with the suction supply means of the path to the atmosphere;
The negative pressure treatment device according to claim 4, comprising:   The negative pressure treatment device according to claim 4, further comprising a second flow path switching unit that switches the fourth flow path and a flow path communicating with the inside of the covering sheet. The fluid includes a cleaning solution for cleaning the wound;
The negative pressure treatment device according to any one of claims 1 to 6, further comprising a supply flow path for supplying the cleaning liquid to the inside of the covering sheet.

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