JP6361844B1 - Negative pressure closure therapy device - Google Patents

Abstract

A passage connecting member 20 is provided between the sticking member 11 and the air permeable member 13. In the passage connecting member 20, the tube member 15 is inserted into a hole portion 28 configured by facing the first concave groove 22 of the first plate member 21 and the second concave groove 26 of the second plate member 25. The internal space of the tube member 15 constitutes a suction passage 15a. An annular water sealing member 30 is provided at the end 15 b of the tube member 15. The water sealing member 30 has continuous pores and is formed of a material that closes the continuous pores when touched by moisture. When the tube member 15 sucks moisture and the moisture reaches the water sealing member 30, the continuous pores of the water sealing member 30 are blocked and further suction of moisture through the tube member 15 is suppressed. Is done.

Description

  The present invention relates to a negative pressure closure therapy device.

  The negative pressure closure therapy device described in Patent Literature 1 includes a film-like sticking member that is stuck to an affected part, and a gauze disposed on one surface side of the sticking member. Moreover, the one end part of the tube is arrange | positioned at the one surface side of the sticking member. The other end of the tube is connected to a pump that sucks gas. With the sticking member attached to the affected part, the pump is driven to suck the gas, whereby the closed space between the sticking member and the affected part is set to a negative pressure.

Japanese Patent Application Laid-Open No. 2016-13458

  When negative pressure closure therapy is performed using the negative pressure closure therapy device described in Patent Document 1, moisture such as blood oozes from the affected area. When such moisture flows into the pump, the suction ability of the pump may be reduced or a failure may be caused. The negative pressure closure therapy device described in Patent Document 1 is provided with a collection container for collecting and collecting water in the middle of the tube. However, when such a collection container is provided, an increase in the size of the pump used in the negative pressure closure therapy device is inevitable.

In order to solve the above problems, the present invention provides a negative pressure source, an adhesive member having adhesiveness on one surface, an air-permeable member having air permeability disposed on one surface side of the adhesive member, A plurality of suction passages provided between the sticking member and the breathable member, wherein one end of each suction passage communicates with a space formed by the sticking member and the breathable member; And an exhaust passage that connects the other end of the plurality of suction passages to the negative pressure source, and each of the plurality of suction passages has water permeability and loses breathability when exposed to moisture. A sealing member is provided , and is a passage connecting member having a housing, the exhaust passage partitioned inside the housing, and a plurality of holes communicating the exhaust passage and the outside of the housing. A plurality of holes in the plurality of holes. Over Bed members are respectively disposed, the interior space of the plurality of tube member is characterized by constituting the suction passage, further Ru comprising the passage connection member.

According to said structure, when the water | moisture content which oozed out from the affected part is attracted | sucked by the suction channel, the water | moisture content will touch the water seal member provided in the said suction channel. And when a water seal member touches moisture, the air permeability of the water seal member is lost, and it becomes difficult to suck air through the suction passage. Accordingly, it is possible to suppress further suction of moisture from the suction passage that has sucked moisture. As a result, even without providing a container or the like for separating and storing moisture, the moisture can be prevented from flowing into the pump, and the pump can be prevented from being enlarged. In addition, according to the above configuration, the exhaust passage and the plurality of suction passages can be communicated with each other with a relatively simple structure in which the plurality of tube members are respectively disposed in the plurality of hole portions of the passage connection member. Therefore, it can suppress that the manufacturing cost of a negative pressure closure therapy instrument provided with the some suction passage connected to an exhaust passage is increased.

  In the above configuration, a plurality of suction passages are provided. Even if air cannot be sucked through any one of these suction passages, air can be sucked from other suction passages, so that the closed space between the sticking member and the affected part can be maintained at a negative pressure.

  In the above invention, the plurality of suction passages extend radially around a predetermined radiation center, and ends of the respective suction passages on the radiation center side are connected to the exhaust passage, and the plurality of suction passages. The predetermined radiation center of the passage may be located at a position closer to one side than the center of the air permeable member in a predetermined direction along the surface of the air permeable member.

  According to said structure, the radial center of the suction passage is located in the one side in the surface direction of a breathable member, and the suction passage is arrange | positioned comparatively densely in the vicinity. On the other hand, on the other side in the surface direction of the sticking member, the suction passages are not arranged as densely as the one side. Therefore, when using a negative pressure closure therapy device of this configuration, it is assumed that the other side in the surface direction of the breathable member is applied to the wound in the affected area, and a lot of moisture oozes out on the other side. There is a high possibility of coming. And in the said structure, since the suction path is extended radially, the suction path is extended on the one side and the other side in the surface direction of a breathable member. And even if a lot of moisture starts to ooze out locally at the other side portion in the surface direction of the breathable member, the possibility that the suction passage extending to one side sucks the moisture is low. Therefore, it is difficult to cause a situation in which the continuous pores of the water sealing members of all the suction passages are blocked and the closed space between the sticking member and the affected part cannot be maintained at a negative pressure.

  In the above invention, the passage connecting member includes a first plate member having an exhaust port for discharging the air flowing in from the suction passage to the outside of the housing, and a second plate member disposed to face the first plate member. The first plate member is provided with a plurality of first concave grooves so as to be continuous with the exhaust passage, and the second plate member is respectively opposed to the plurality of first concave grooves. A plurality of second concave grooves are provided, and the plurality of first concave grooves and the plurality of second concave grooves facing the plurality of first concave grooves constitute the plurality of hole portions. The water sealing member is provided in the plurality of holes.

  According to said structure, even if it does not fill a water sealing member inside the tube member, for example, a water sealing member is arrange | positioned between the 1st ditch | groove of a 1st board | plate material, and the 2nd ditch | groove of a 2nd board | plate material. The water sealing member can be provided in the suction passage by a relatively simple operation. As a result, it is possible to suppress the manufacturing process for providing the water sealing member in the suction passage from becoming complicated.

In the above invention, a piezoelectric pump connected to the exhaust passage may be provided, and the piezoelectric pump may be disposed between the sticking member and the breathable member.
According to said structure, since the piezoelectric pump is incorporated between the sticking member and the air permeable member, an external pump is provided outside the closed space between the sticking member and the affected part, or connected to the external pump. There is no need to provide a pipe for this purpose. Therefore, it is possible to contribute to the downsizing and handling of the negative pressure closure therapy device.

  The water sealing member may be made of at least one material selected from a water-absorbing polymer, a PVA sponge, a water-absorbing fiber, and a hydrophobic membrane. The breathable member may be made of gauze.

  ADVANTAGE OF THE INVENTION According to this invention, it can suppress that the water | moisture which oozed out from the affected part flows into a pump, suppressing the enlargement of the pump used for a negative pressure closure therapy instrument.

Sectional drawing of a negative pressure closure therapy instrument. FIG. 2 is a sectional view taken along line 2-2 in FIG. 1. The perspective view of a channel | path connection member. The disassembled perspective view of a channel | path connection member. Sectional drawing of a channel | path connection member. Sectional drawing of a piezoelectric pump. Sectional drawing when the piezoelectric pump is driving. Sectional drawing when the piezoelectric pump is driving. Sectional drawing of the negative pressure closure therapy apparatus of the example of a change.

  Hereinafter, an embodiment of a negative pressure closure therapy device will be described with reference to FIGS. In the following description, the side of the affected area when the negative pressure closure therapy device is affixed to the affected area will be described as the lower side, and the opposite side will be described as the upper side.

  As shown in FIG. 1, the negative pressure closure therapy device includes a film-like sticking member 11 formed of a transparent resin such as polyethylene. As shown in FIG. 2, the sticking member 11 has a substantially rectangular shape when seen in a plan view. The lower surface of the sticking member 11 has adhesiveness, and is an adhesive face 11a configured so that the sticking member 11 can be stuck to the affected part (skin).

  As shown in FIG. 1, a cloth-like first gauze 12 is disposed below the sticking member 11. The first gauze 12 has a substantially rectangular shape in plan view, and the vertical and horizontal dimensions are smaller than the vertical and horizontal dimensions of the sticking member 11. Moreover, the 1st gauze 12 is arrange | positioned so that it may not protrude from the sticking member 11 when planarly viewed. The upper surface of the first gauze 12 is affixed to the adhesive surface 11 a of the affixing member 11. The first gauze 12 has air permeability and hygroscopicity, and absorbs a certain amount of water that has spread from the affected area.

  As shown in FIG. 1, a cloth-like second gauze 13 is disposed below the sticking member 11 and further below the first gauze 12. The second gauze 13 has a substantially rectangular shape in plan view, and the vertical and horizontal dimensions are the same as those of the first gauze 12. The second gauze 13 is arranged so as to overlap the first gauze 12 when viewed in plan. The peripheral edge on the upper surface of the second gauze 13 is fixedly adhered to the peripheral edge on the lower surface of the first gauze 12 with an adhesive (not shown). The second gauze 13 has air permeability and hygroscopicity, and absorbs a certain amount of water that has spread from the affected area. In this embodiment, the second gauze 13 corresponds to a breathable member.

  As shown in FIG. 1, a plurality of tube members 15 are provided between the first gauze 12 and the second gauze 13 in the vertical direction. The tube member 15 is formed in a tubular shape with a resin such as polyethylene. As shown in FIG. 2, the plurality of tube members 15 extend radially about the radial center C in the surface direction of the sticking member 11. In this embodiment, eight tube members 15 are provided at an interval of approximately 45 degrees in the circumferential direction centered on the radiation center C. An end portion 15 b (sometimes referred to as a base end or an inner end) on the radiation center side of each tube member 15 reaches the inside of the passage connection member 20. The internal space of each tube member 15 constitutes a suction passage 15a. In each tube member 15, a tip 15 c (sometimes referred to as an outer end) opposite to the end portion 15 b is disposed in a space 14 formed by the sticking member 11 and the second gauze 13 and communicates with the space 14. doing.

  As shown in FIGS. 3 and 4, the passage connecting member 20 can include a housing 20 a configured by a first plate member 21 and a second plate member 25 disposed to face the lower side of the first plate member 21. . A water seal member 30 is disposed between the first plate member 21 and the second plate member 25. The 1st board | plate material 21 and the 2nd board | plate material 25 are disk shape, for example, and the 1st board | plate material 21 and the 2nd board | plate material 25 can have the same footprint. A plurality of first concave grooves 22 are provided on the lower surface of the first plate member 21. The first concave groove 22 is substantially semicircular when viewed in cross section. The first groove 22 extends radially from the center of the first plate 21 in the surface direction of the first plate 21. In this embodiment, eight first concave grooves 22 are provided in the circumferential direction of the first plate member 21 at an interval of approximately 45 degrees. A cylindrical exhaust port 23 is provided on the upper side surface of the first plate member 21 so as to protrude upward. The exhaust port 23 is configured to discharge the air that has flowed into the housing 20a from the tube member 15 to the outside of the housing 20a. The exhaust port 23 is provided at the center of the first plate 21 in the surface direction of the first plate 21. The inside of the exhaust port 23 passes through the first plate 21 in the thickness direction and opens on the lower surface of the first plate 21.

  The second plate member 25 has a disk shape with the same diameter as the first plate member 21. A plurality of second concave grooves 26 are provided on the upper side surface of the second plate member 25. The second concave groove 26 is substantially semicircular when viewed in cross section. The second concave grooves 26 extend radially from the center of the second plate member in the surface direction of the second plate member 25. In this embodiment, eight second concave grooves 26 are provided in the circumferential direction of the second plate member 25 at an interval of approximately 45 degrees. The 2nd board | plate material 25 is arrange | positioned so that the center of the said 2nd board | plate material 25 may correspond with the center of the 1st board | plate material 21 in the surface direction. The second plate member 25 is positioned with respect to the first plate member 21 so that the second groove 26 of the second plate member 25 and the first groove 22 of the first plate member 21 face each other. As shown in FIGS. 3 and 5, the passage connecting member 20 has a substantially circular shape in cross-section by opposing arrangement of the first concave groove 22 of the first plate member 21 and the second concave groove 26 of the second plate member 25. A hole 28 is formed.

  As shown in FIG. 4, the water sealing member 30 has an annular shape and the thickness in the vertical direction is larger than the diameter of the tube member 15. The water sealing member 30 is arranged so that the center of the ring coincides with the center of the first plate member 21 in the surface direction. The water sealing member 30 is porous having continuous pores, and is formed of a water-absorbing polymer material (for example, sodium polyacrylate). The porous water-absorbing polymer material is obtained by once absorbing water into the water-absorbing polymer material and then sublimating the water by freeze drying or polymerizing the monomer while foaming with a foaming agent. be able to.

  As shown in FIG. 5, the water sealing member 30 is sandwiched between the first plate member 21 and the second plate member 25 and is compressed up and down by these members. Here, the vertical interval between the first plate member 21 and the second plate member 25 is relatively short in the flat portion where the first groove 22 and the second groove 26 are not provided. The hole portion 28 in which the groove 22 and the second concave groove 26 are provided is relatively long. Therefore, in the water sealing member 30, in the location pinched | interposed by the flat part of the 1st board | plate material 21 and the 2nd board | plate material 25, it compresses strongly and an internal continuous pore is crushed. Therefore, the water sealing member 30 has almost no air permeability at the portion sandwiched between the flat portions. On the other hand, in the water sealing member 30, at a portion sandwiched between the first concave groove 22 and the second concave groove 26, the degree of compression is small and the internal continuous pores are not completely crushed. Therefore, the water sealing member 30 has air permeability inside the hole 28. A space 30 a between the first plate member 21 and the second plate member 25 and radially inward of the water seal member 30 communicates with the internal space 23 a of the exhaust port 23 of the first plate member 21. This space 30 a constitutes an exhaust passage together with the internal space 23 a of the exhaust port 23. An adhesive (not shown) is filled between the flat portion of the first plate member 21 and the flat portion of the second plate member 25 so that the first plate member 21 and the second plate member 25 are not separated from each other in the vertical direction. ing.

  In each hole portion 28 of the passage connecting member 20, an end portion 15b on the radial center side of the tube member 15 is inserted. In this embodiment, since the tube member 15 extends along the hole 28 (the first concave groove 22 and the second concave groove 26) inside the passage connecting member 20, the radial center C of the tube member 15 is In the plane direction, it coincides with the center of the first plate 21 and the center of the second plate 25. An end 15 b on the radial center side of the tube member 15 is in contact with the outer peripheral surface of the water seal member 30. In other words, the water seal member 30 is provided at the end of the suction passage 15 a that is the internal space of the tube member 15.

  As shown in FIG. 2, the passage connecting member 20 is disposed closer to one side (right side in FIG. 2) than the center of the second gauze 13 in the longitudinal direction of the second gauze 13 (left and right direction in FIG. 2). ing. As described above, since the radiation center C of the tube member 15 coincides with the center of the first plate member 21 and the center of the second plate member 25 in the surface direction, the radiation center C of the tube member 15 is also the second gauze 13. In the longitudinal direction, the second gauze 13 is closer to one side than the center.

  As shown in FIG. 1, a negative pressure source is attached to the upper side of the passage connection member 20. In this embodiment, the negative pressure source is the piezoelectric pump 40 for discharging the air in the closed space between the sticking member 11 and the affected part to the outside. As shown in FIG. 6, the piezoelectric pump 40 is configured by laminating a plurality of square plate members in plan view. In FIG. 6, the thickness relationship of each layer is illustrated in a simplified manner, and may not match the actual thickness of each layer of the piezoelectric pump 40.

  A suction port 41 a for introducing air into the piezoelectric pump 40 is provided at the center of the bottom plate member 41 located on the lowermost side among the plurality of plate members constituting the piezoelectric pump 40. The suction port 41a has a circular shape in plan view. The inner diameter of the circular suction port 41a is substantially the same as the outer diameter of the exhaust port 23 of the passage connection member 20, so that the exhaust port 23 of the passage connection member 20 can be connected to the inside of the suction port 41a. It has become. On the upper side of the bottom plate member 41, a plate-like first passage constituting member 42 is laminated.

  The first passage constituting member 42 is provided with a plurality (two in FIG. 6) of first suction passages 42a extending from the center of the first passage constituting member 42 to the outside. The first suction passage 42a communicates with the suction port 41a of the bottom plate member 41 at a central portion. A plate-like first separator 43 is stacked on the upper side of the first passage constituting member 42.

  The first separator 43 is provided with a plurality of (two in FIG. 6) through-holes 43 a penetrating the first separator 43. The through hole 43a has a circular shape in plan view. The through hole 43a is provided at a position corresponding to the outer end of the first suction passage 42a in the first passage component 42, and communicates with the first suction passage 42a. A plate-like lower frame member 44 is laminated on the upper side of the first separator 43.

  The lower frame member 44 is provided with a plurality of (two in FIG. 6) through-holes 44 a that penetrate the lower frame member 44. The through hole 44a has a circular shape with the same diameter as the through hole 43a of the first separator 43, and is provided at a position facing the through hole 43a. A circular opening 44 b is provided at the center of the lower frame member 44. The diameter of the opening 44b is more than half the length of one side of the square-shaped lower frame member 44. In this embodiment, the diameter of the opening 44b is approximately two-thirds of the square-shaped lower frame member 44. A diaphragm plate 45 is laminated on the upper side of the lower frame member 44.

  The diaphragm plate 45 is made of a flexible metal plate. The diaphragm plate 45 is provided with a plurality of (two in FIG. 6) through-holes 45 a that penetrate the diaphragm plate 45. The through hole 45a has a circular shape with the same diameter as the through hole 44a of the lower frame member 44, and is provided at a position facing the through hole 44a. A disk-shaped piezoelectric element 50 is provided on the lower surface of the diaphragm plate 45. The outer diameter of the piezoelectric element 50 is smaller than the inner diameter of the opening 44 b of the lower frame member 44. The piezoelectric element 50 is attached to the center of the lower surface of the diaphragm plate 45 and is accommodated in the opening 44 b of the lower frame member 44. The piezoelectric element 50 is a unimorph type (monomorph type) element in which electrode plates are attached to both sides of a plate-like piezoelectric ceramic. A plate-like upper frame member 46 is laminated on the upper side of the diaphragm plate 45.

  The upper frame member 46 is provided with a plurality of (two in FIG. 6) through holes 46 a that penetrate the upper frame member 46. The through hole 46a has a circular shape with the same diameter as the through hole 45a of the diaphragm plate 45, and is provided at a position facing the through hole 45a. A circular opening 46 b is provided at the center of the upper frame member 46. The diameter of the opening 46 b is the same as the diameter of the opening 44 b of the lower frame member 44. The opening 46b is provided at a position overlapping the opening 44b of the lower frame member 44 in the surface direction. On the upper side of the upper frame member 46, a plate-like second separator 47 is laminated.

  The second separator 47 is provided with a plurality of (two in FIG. 6) through-holes 47 a that penetrate the second separator 47. The through hole 47a has a circular shape with the same diameter as the through hole 46a of the upper frame member 46, and is provided at a position facing the through hole 46a. In this embodiment, the through hole 43a of the first separator 43, the through hole 44a of the lower frame member 44, the through hole 45a of the diaphragm plate 45, the through hole 46a of the upper frame member 46, and the through hole of the second separator 47 47a communicates with each other, and thereby, a communication path 40a extending upward from the first suction path 42a of the first path component 42 is configured. In the center of the second separator 47, a circular blower hole 47b penetrating the second separator 47 is provided. The inner diameter of the blower hole 47 b is smaller than the inner diameter of the opening 46 b of the upper frame member 46. The blower chamber S is defined by the lower surface of the second separator 47, the inner peripheral surface of the opening 46 b in the upper frame member 46, and the upper surface of the diaphragm plate 45. The blower hole 47 b of the second separator 47 communicates with the blower chamber S. On the upper side of the second separator 47, a plate-like second passage constituting member 48 is laminated.

  The second passage constituting member 48 is provided with a plurality of (two in FIG. 6) second suction passages 48a extending from the center of the second passage constituting member 48 to the outside. The second suction passage 48a communicates with the through hole 47a (communication passage 40a) of the second separator 47 in the outer portion. The second suction passage 48a communicates with the blower hole 47b of the second separator 47 in the central portion. A plate-like top plate member 49 is laminated on the upper side of the second passage constituting member 48.

  The top plate member 49 is provided with a discharge port 55 for discharging air from the inside of the piezoelectric pump 40. The discharge port 55 has a cylindrical shape protruding upward. The inside of the discharge port 55 passes through the top plate member 49 in the thickness direction and opens on the lower surface of the top plate member 49. The inner diameter of the discharge port 55 is circular with the same diameter as the blower hole 47 b of the second separator 47. The lower opening of the discharge port 55 faces the blower hole 47b of the second separator 47 with the second suction passage 48a of the second passage constituting member 48 interposed therebetween. As shown in FIG. 1, the discharge port 55 passes through the first gauze 12 and the adhesive member 11 and opens on the upper surface of the adhesive member 11 (the outer surface of the negative pressure closure therapy device).

  As shown in FIGS. 1 and 2, a drive circuit 60 for driving the piezoelectric pump 40 is provided between the first gauze 12 and the second gauze 13 in the vertical direction. The drive circuit 60 includes a battery for supplying power to the piezoelectric element 50 of the piezoelectric pump 40, a control circuit for controlling a voltage applied to the piezoelectric element 50, and the like. The drive circuit 60 is provided with a switch 61 for switching start / stop of power supply from the battery of the drive circuit 60 to the piezoelectric element 50. The switch 61 is a push button switch that switches between start and stop of power supply each time it is pressed.

  As shown in FIG. 2, the drive circuit 60 is disposed on one side (the side on which the passage connection member 20 is close) from the passage connection member 20 and the piezoelectric pump 40 in the longitudinal direction of the second gauze 13. That is, the drive circuit 60 is disposed closer to the ends than the passage connection member 20 and the piezoelectric pump 40. The drive circuit 60 is separated from the passage connecting member 20 in the surface direction of the second gauze 13. Note that the drive circuit 60 and the piezoelectric element 50 of the piezoelectric pump 40 are electrically connected via a signal line and a power supply line (not shown).

The operation of the negative pressure closure therapy device configured as described above will be described. First, the operation of the piezoelectric pump 40 will be described.
When no voltage is applied to the piezoelectric element 50 of the piezoelectric pump 40, the piezoelectric element 50 and the diaphragm plate 45 are not bent and are substantially flat as shown in FIG. In this state, when a predetermined voltage is applied to the piezoelectric element 50 from the drive circuit 60, the piezoelectric element 50 bends so that the center side in the width direction protrudes downward as shown in FIG. Along with this, the diaphragm plate 45 also bends so that the center side in the width direction protrudes downward. At this time, since the volume of the blower chamber S partitioned on the upper side of the diaphragm plate 45 is increased, the suction port 41a, the first suction passage 42a, the communication passage 40a, the second suction passage 48a, and the blower hole 47b are used. Air flows into the blower chamber S.

  Thereafter, when a reverse voltage is applied to the piezoelectric element 50 from the drive circuit 60, the piezoelectric element 50 bends so that the center in the width direction protrudes upward as shown in FIG. Accordingly, the diaphragm plate 45 also bends so that the center side in the width direction protrudes upward. At this time, since the volume of the blower chamber S partitioned on the upper side of the diaphragm plate 45 is reduced, air flows out from the blower chamber S through the blower hole 47b. In the second suction passage 48a, air flows from the outer side in the width direction to the center side (the blower hole 47b side), so the air that has flowed out of the blower chamber S moves from the center side in the width direction of the second suction passage 48a to the outer side. It is difficult to reverse flow. On the other hand, since the lower opening of the discharge port 55 is opposed to the blower hole 47b, the air that has flowed out of the blower chamber S through the blower hole 47b quickly goes to the outside from the discharge port 55. Discharged. By supplying an alternating voltage of a predetermined frequency from the drive circuit 60 to the piezoelectric element 50, the above series of operations are repeatedly executed.

Next, the effect | action at the time of performing negative pressure closure therapy using said negative pressure closure therapy apparatus is demonstrated.
When negative pressure closure therapy is performed, the lower surface of the application member 11 in the negative pressure closure therapy device configured as described above is attached to the affected part (skin). Here, as shown in FIG. 2, in the negative pressure closure therapy device of the above embodiment, the passage connecting member 20 and the piezoelectric pump 40 are brought closer to one side in the longitudinal direction of the second gauze 13 (right side in FIG. 2). Has been placed. Therefore, there is a portion where the passage connecting member 20, the piezoelectric pump 40, and the like are not disposed on the other longitudinal side of the second gauze 13 (left side in FIG. 2). Therefore, the sticking member 11 is stuck to the affected part so that the other part in the longitudinal direction of the second gauze 13 is in contact with the wound surface in the affected part.

  After the sticking member 11 is stuck to the affected part to form a closed space between the sticking member 11 and the affected part, the piezoelectric pump 40 is driven by pressing the switch 61 of the drive circuit 60 from the upper side of the sticking member 11. When the piezoelectric pump 40 is driven, air in the closed space is sucked through each tube member 15 and discharged to the outside. As a result, the closed space between the sticking member 11 and the affected part becomes negative pressure.

  When negative pressure closure therapy is performed as described above, moisture such as blood oozes from the affected area. Most of the water that has oozed out is absorbed and held by the first gauze 12 and the second gauze 13, but if the amount of the oozed water exceeds the water absorption capacity of the first gauze 12 or the second gauze 13, The moisture in the part is sucked to the piezoelectric pump 40 side through the tube member 15. When the moisture passes through the suction passage 15 a inside the tube member 15 and reaches the water seal member 30 inside the passage connection member 20, the moisture is absorbed at the contact portion of the water seal member 30 with the tube member 15. When the water sealing member 30 absorbs moisture and partially swells, the continuous pores formed inside the water sealing member 30 are closed. As a result, the water sealing member 30 loses air permeability at the contact portion with the tube member 15, and the end 15b on the radial center side of the tube member 15 that has sucked moisture is blocked by the swollen water sealing member 30. It becomes. Thereafter, air and moisture are not sucked through the tube member 15 and the moisture reaches the piezoelectric pump 40 is suppressed.

  By the way, since the water sealing member 30 of this embodiment is an annular one-piece member, if the amount of moisture reaching the water sealing member 30 is large, only the contact portion of the water sealing member 30 with the tube member 15 is used. In addition, the entire water sealing member 30 may swell. However, as described above, when a certain amount of moisture is sucked through the tube member 15, the end 15 b of the tube member 15 is blocked by the water sealing member 30, and moisture is sucked further. Is suppressed. Therefore, it is unlikely that the end portions 15b of all the tube members 15 are blocked by the swollen water sealing members 30 due to the suction of moisture from some of the tube members 15. Therefore, even if some of the tube members 15 suck moisture, air can be sucked through the other tube members 15 that are not sucking moisture, and the closed space between the sticking member 11 and the affected part can be reduced. Negative pressure is maintained.

According to the embodiment, the following effects can be achieved.
In the above embodiment, when moisture that has spread from the affected area is sucked through the tube member 15, the moisture touches the water seal member 30 provided at the end 15 b of the tube member 15 and is absorbed. The continuous pores are blocked by the water sealing member 30 absorbing moisture, and air and moisture cannot be sucked again through the tube member 15 once sucked moisture. Accordingly, it is possible to suppress further suction of moisture from the tube member 15 that has suctioned moisture once. As a result, the inflow of moisture into the piezoelectric pump 40 can be suppressed without providing a container or the like for separating and storing moisture as in the negative pressure closure therapy device described in Patent Document 1. In addition, the increase in the size of the negative pressure closure therapy device can be suppressed.

  In the above embodiment, the radiation center C of the tube member 15 (suction passage 15 a), that is, the center of the passage connection member 20 is close to one side in the longitudinal direction of the second gauze 13. Therefore, a hard object such as the passage connecting member 20 and the piezoelectric pump 40 does not exist on the other side of the second gauze 13 in the longitudinal direction, and the tube members 15 are not arranged so densely. Therefore, the other side in the longitudinal direction of the second gauze 13 can be used as a location that hits the wound surface in the affected area, and if used in this way, the passage connecting member 20 and the tube member 15 will hit the wound in the affected area. Can be suppressed.

  In the above embodiment, since the plurality of tube members 15 extend radially, even if a large amount of water starts to exude locally at some part in the surface direction of the second gauze 13, the water starts to exude. Moisture is not easily sucked from the tube member 15 extending on the opposite side to the portion where the tube member 15 is located, and the tube member 15 is not easily blocked by the water sealing member 30 swelled. Therefore, a situation in which all the tube members 15 are blocked by the swollen water sealing member 30 and the closed space between the sticking member 11 and the affected part cannot be maintained at a negative pressure is unlikely to occur.

  In particular, in the above embodiment, as described above, since the radiation center C of the tube member 15 is disposed on one side in the longitudinal direction of the second gauze 13, the radiation center C is disposed on one side in the longitudinal direction of the second gauze 13. It can suppress more reliably that the tube member 15 which extends will attract | suck a water | moisture content.

  In the above embodiment, the suction passage 15 a that is the internal space of the tube member 15 and the water sealing member 30 are formed by a relatively simple structure in which the tube member 15 is communicated with the hole 28 of the passage connection member 20. A space 30a on the radially inner side and an exhaust passage constituted by the internal space 23a of the exhaust port 23 are connected. Therefore, for example, it is possible to easily connect the exhaust passage and the suction passage 15a as compared with a structure in which the tube members 15 are individually connected to one tubular member. Therefore, when employing the plurality of tube members 15 (suction passages 15a), it is possible to suppress an increase in the manufacturing cost of the negative pressure closure therapy device.

  In the above embodiment, the water sealing member 30 is disposed at the end 15b of the tube member 15 (suction passage 15a) by being sandwiched between the first plate member 21 and the second plate member 25 in the passage connection member 20. . Therefore, for example, the water sealing member 30 can be easily provided in the suction passage 15a as compared with the case where the water sealing member 30 is filled in each tube member 15.

  In the above embodiment, since one water sealing member 30 is provided for the eight tube members 15, the number of parts can be reduced as compared with the case where the water sealing member 30 is provided for each tube member 15. . For example, if the water sealing member 30 is excessively small, the water sealing member 30 may be sucked into the piezoelectric pump 40 as foreign matter together with the air when the piezoelectric pump 40 sucks air. In this regard, the water seal member 30 of the above embodiment is correspondingly large with respect to the size of the exhaust port 23, so it is unlikely that the water seal member 30 is sucked into the piezoelectric pump 40.

  In the state where the water sealing member 30 has absorbed moisture, the continuous pores of the water sealing member 30 may not be completely closed. If at least a part of the continuous pores of the water sealing member 30 is blocked and the air permeability of the water sealing member 30 is lowered, the tube member 15 (suction passage 15a) provided with the water sealing member 30 is used. Inhalation of further moisture is suppressed.

  In the above embodiment, since the piezoelectric pump 40 is built in between the first gauze 12 and the second gauze 13, it is not necessary to connect an external pump. Therefore, it is not necessary to provide a tube connecting the negative pressure closure therapy device and the external pump, and it is possible to contribute to the downsizing and handling of the negative pressure closure therapy device. In addition, since the piezoelectric pump 40 is small in size, when the volumes of the first suction passage 42a, the communication passage 40a, the second suction passage 48a, and the blower chamber S in the inside thereof are small, moisture is sucked. Degradation of performance or failure is likely to occur. It is very effective to apply a configuration in which the tube member 15 that has sucked water by the water sealing member 30 is closed to such a negative pressure closure therapy device using the piezoelectric pump 40.

  In the above embodiment, the passage connecting member 20 and the drive circuit 60 are spaced apart from each other in the surface direction of the second gauze 13. Therefore, the heat generated by the drive circuit 60 is transmitted to the water seal member 30 of the passage connection member 20, and the risk of adversely affecting the water absorption of the water seal member 30 can be reduced.

The above embodiment can be modified as follows.
-The planar view shape of the sticking member 11, the 1st gauze 12, and the 2nd gauze 13 does not need to be a rectangular shape. For example, it may be square or circular. Moreover, the sticking member 11, the 1st gauze 12, and the 2nd gauze 13 may not be a thing of a plane shape, and may be curving in circular arc shape. The shapes of the affixing member 11, the first gauze 12, and the second gauze 13 may be determined in consideration of the size and part of the affected part that is assumed to be used.

  -Instead of the 1st gauze 12 and the 2nd gauze 13, you may provide the member of another material. For example, the nonwoven fabric formed with the absorbent cotton which is not cloth-like, or a synthetic resin may be sufficient. Any material can be applied as long as it has air permeability that allows air to be sucked through each tube member 15.

  If each tube member 15, passage connecting member 20, piezoelectric pump 40, and drive circuit 60 can appropriately prevent the adhesive member 11 from being pierced or torn when it touches the adhesive member 11, One gauze 12 can be omitted.

The number of tube members 15 (suction passages 15a) is not limited to eight. If a plurality of tube members 15 are provided, the number may be seven or less, or nine or more.
In the above embodiment, the plurality of tube members 15 are arranged at predetermined angular intervals (45 degree intervals) in the circumferential direction around the radiation center C, but the intervals in the circumferential direction of the tube members 15 are not limited. Even if the circumferential intervals of the tube members 15 are not equal, if the plurality of tube members 15 extend in the radial direction from the radial center C, it can be said that the tube members 15 extend radially.

  -Furthermore, the some tube member 15 does not need to extend radially. As long as each tube member 15 (suction passage 15a) is connected to the exhaust passage, for example, a plurality of tube members 15 may extend in parallel to each other.

  -In above-mentioned embodiment, although the edge part 15b of the tube member 15 contact | abutted to the water seal member 30, it does not necessarily need to contact | abut. In this case, a suction passage is formed by the internal space of the hole portion 28 between the end portion 15 b of the tube member 15 and the water sealing member 30.

  The position of the passage connecting member 20 in the surface direction of the second gauze 13, that is, the position of the radiation center C of the tube member 15 (suction passage 15 a) in the surface direction of the second gauze 13 is not limited to the example of the above embodiment. . For example, the radiation center C of the tube member 15 (suction passage 15a) may be located at the center in the longitudinal direction of the second gauze 13.

  -The planar view shape of the channel | path connection member 20 (the 1st board | plate material 21 and the 2nd board | plate material 25) is not restricted circularly. For example, a square shape may be used in accordance with the planar view shape of the piezoelectric pump 40, or a shape other than that may be used.

  -The 1st ditch | groove 22 of the 1st board | plate material 21 in the channel | path connection member 20 does not necessarily reach to the center of the 1st board | plate material 21. FIG. It is sufficient that at least the position corresponding to the inner edge of the water sealing member 30 is reached in the radial direction of the first plate member 21. This also applies to the second concave groove 26 of the second plate member 25.

  The tube member 15 may not be inserted into the hole 28 of the passage connection member 20. In this case, a portion of the hole 28 of the passage connecting member 20 that is radially outward from the water seal member 30 constitutes a suction passage.

The shape of the water seal member 30 is not limited to an annular shape. Any shape that can fill the inside of the hole 28 of the passage connecting member 20 may be used, and for example, a disk shape may be used.
Instead of providing one water sealing member 30 for the plurality of tube members 15 (suction passages 15 a), a separate water sealing member 30 may be provided for each tube member 15. For example, the water sealing member 30 of the above embodiment may be divided into eight equal parts in the circumferential direction. For example, as shown in FIG. 9, a water seal member 35 may be provided at the end 15 c of each tube member 15 on the side opposite to the passage connection member 20 so as to close the opening of the tube member 15. Furthermore, a spherical water sealing member having a diameter approximately equal to the inner diameter of the hole 28 of the passage connecting member 20 may be disposed inside each hole 28.

  The housing 20a of the passage connecting member 20 may be formed of a one-piece member instead of the first plate member 21 and the second plate member 25. In this case, instead of sandwiching the water sealing member 30 between the first plate member 21 and the second plate member 25, each of the water sealing members 30 configured to tightly fit each hole 28 of the housing 20a which is a one-piece member is provided. The hole 28 can be filled.

  A tube connected to the piezoelectric pump 40 may be provided instead of the passage connecting member 20. In this case, each tube member 15 may be connected to the tube material, and the inside of each tube member 15 may be filled with a water seal member.

  The material of the water sealing member 30 is not limited as long as it is a material that has continuous pores and can be closed by touching moisture. For example, a polyvinyl alcohol sponge (PVA sponge) or a water absorbent fiber may be used. Even with these materials, when the moisture is touched, the moisture is absorbed inside and the continuous pores are blocked. Moreover, the filter made from a hydrophobic membrane may be sufficient. The hydrophobic membrane has pores (continuous pores) formed in the film thickness direction and has air permeability in the absence of moisture. When moisture comes into contact with the hydrophobic membrane, moisture cannot enter the pores (continuous pores) due to surface tension with respect to the hydrophobic membrane, and the moisture closes the pores (continuous pores) on the surface of the hydrophobic membrane.

  The tube member 15 can be directly connected to the piezoelectric pump 40. For example, the tube member 15 may be connected to the plurality of communication passages 40 a of the piezoelectric pump 40. In this case, a suction passage is constituted by the internal space of the tube member 15, the communication passage 40a of the piezoelectric pump 40, and the second suction passage 48a. The inside of the discharge port 55 of the piezoelectric pump 40 constitutes an exhaust passage. In this modified example, the water seal member may be filled into any of the internal space of the tube member 15, the communication passage 40a of the piezoelectric pump 40, and the second suction passage 48a.

  In the embodiment, the piezoelectric pump 40 disposed between the first gauze 12 and the second gauze 13 is used as the negative pressure source, but the negative pressure source is not limited to the piezoelectric pump 40. As long as it has a size that can be arranged between the first gauze 12 and the second gauze 13 and can maintain a closed space between the adhesive member 11 and the affected part at a negative pressure, any Even a pump can be applied as a negative pressure source.

  An external pump may be provided in place of the piezoelectric pump 40. Even when the external pump is provided as described above, the suction of moisture into the external pump due to the presence of the water sealing member 30 is appropriately suppressed. Therefore, it is not necessary to provide a collection container for collecting moisture in the external pump, which can contribute to downsizing of the external pump. When an external pump is provided in place of the piezoelectric pump 40, the pump is not provided in the space 14 formed by the sticking member 11 and the air permeable member 13.

  The drive circuit 60 may be disposed, for example, between the passage connection member 20 and the piezoelectric pump 40, or may be stacked on the upper side of the piezoelectric pump 40. In this case, it is not necessary to secure a space for providing the drive circuit 60 in the surface direction of the second gauze 13.

  -The drive circuit 60 does not necessarily need to be arrange | positioned in the closed space between the sticking member 11 and an affected part. For example, the drive circuit 60 may be attached to the outer surface of the sticking member 11 and may be electrically connected to the piezoelectric pump 40 via a signal line and a power line. Thus, if the drive circuit 60 is provided outside, it is possible to replace the battery of the drive circuit 60 without removing the sticking member 11 once attached to the affected area.

  In the embodiment, the entire lower surface of the adhesive member 11 is the adhesive surface 11a, but the lower surface of the adhesive member 11 can include an adhesive surface and a non-adhesive surface. For example, the adhesive surface may be a belt-like adhesive surface provided on at least the outer edge of the lower surface of the sticking member 11.

The present disclosure includes the following configurations. The reference numerals of the constituent elements of the embodiment are given for the purpose of understanding but not limitation.
[Appendix 1] A negative pressure closure therapy device used by being attached to a patient so as to cover a part or all of the affected part of the patient,
A breathable innermost layer (13) having a patient contacting surface;
An outermost layer (11) including an adhesive surface (11a) configured to adhere to a patient's skin, the space (14) between the breathable innermost layer (13) and the outermost layer (11) The outermost layer (11) covering the entire breathable innermost layer (13), so that
A plurality of tube members (15) disposed in the space (14) between the breathable innermost layer (13) and the outermost layer (11), wherein the breathable innermost layer (13) in plan view A plurality of tube members (15) including a plurality of distal end openings distributed at different positions and a plurality of end openings opposite to the plurality of distal end openings;
So that the air in the space (14) between the breathable innermost layer (13) and the outermost layer (11) is discharged out of the outermost layer (11) through the plurality of tube members (15). A negative pressure source (40) configured to be in airtight communication with the plurality of tube members (15);
A liquid sensing material block disposed downstream of the plurality of end openings of the plurality of tube members (15) and upstream of the negative pressure source (40) and having air permeability in a dry state and losing air permeability in a wet state (30)
When the liquid sensing material block (30) flows out from the end opening of one or more tube members of the plurality of tube members (15), the liquid sensing material block (30) is locally wet by the flowed-out liquid, and the liquid sensing A wet portion of the material block (30) selectively blocks the end opening of the one or more tube members from which the liquid has flowed out, and from the end opening of the one or more tube members from which the liquid has flowed out. Negative pressure closure therapy device characterized in that the flow of gas and liquid to the negative pressure source (40) is blocked.

  DESCRIPTION OF SYMBOLS 11 ... Pasting member (outermost layer), 12 ... 1st gauze, 13 ... 2nd gauze (breathable member, breathable innermost layer), 15 ... Tube member, 15a ... Suction passage, 20 ... Passage connection member, 21 ... First DESCRIPTION OF SYMBOLS 1 board | plate material, 22 ... 1st ditch | groove, 23 ... exhaust port, 23a ... Internal space (exhaust passage), 25 ... 2nd board | plate material, 26 ... 2nd ditch | groove, 28 ... hole, 30 ... Water seal member (liquid sensing) Material block), 30a ... space (exhaust passage), 35 ... water seal member, 40 ... piezoelectric pump (negative pressure source), 40a ... communication passage, 41 ... bottom plate member, 41a ... suction port, 42 ... first passage constituent member 42a ... first suction passage, 43 ... first separator, 43a ... through hole, 44 ... lower frame member, 44a ... through hole, 44b ... opening, 45 ... diaphragm plate, 45a ... through hole, 46 ... upper frame member 46a ... through hole, 46b ... opening, 47 ... second separator, 7a ... through hole, 47b ... blower hole, 48 ... second passage component, 48a ... second suction passage, 49 ... top plate member, 50 ... piezoelectric element, 55 ... discharge port, 60 ... drive circuit, 61 ... switch, C: Radiation center of the tube member.

Claims (6)

Negative pressure source,
A sticking member having adhesiveness on one side;
A breathable member having breathability disposed on one surface side of the sticking member;
A plurality of suction passages provided between the sticking member and the breathable member, wherein one end of each suction passage communicates with a space formed by the sticking member and the breathable member When,
An exhaust passage connecting the other end of the plurality of suction passages and the negative pressure source;
Each of the plurality of suction passages is provided with a water sealing member that has air permeability and loses air permeability by touching moisture ,
A passage connecting member having a housing, the exhaust passage partitioned inside the housing, and a plurality of holes communicating the exhaust passage and the outside of the housing, wherein the plurality of holes include a plurality of tube member are arranged respectively, the interior space of the plurality of tube member is characterized by constituting the suction passage, negative pressure wound therapy device that further comprises said Rukoto the passage connection member . The plurality of suction passages extend radially around a predetermined radiation center, and the end of each suction passage on the radiation center side is connected to the exhaust passage,
The predetermined radiation center of the plurality of suction passages is located at a position closer to one side than the center of the breathable member in a predetermined direction along the surface of the breathable member. 2. The negative pressure closure therapy device according to 1. The passage connecting member is
A first plate member having an exhaust port for discharging the air flowing into the housing from the suction passage to the outside of the housing, and a second plate member disposed to face the first plate member,
The first plate member is provided with a plurality of first concave grooves so as to be continuous with the exhaust passage,
The second plate member is provided with a plurality of second grooves so as to face the plurality of first grooves, respectively.
The plurality of holes are configured by the plurality of first grooves and the plurality of second grooves facing the plurality of first grooves.
The water sealing member, negative pressure wound therapy device of claim 1 or 2, characterized in that provided in the plurality of holes. The negative pressure source is a piezoelectric pump,
The negative pressure closure therapy device according to any one of claims 1 to 3 , wherein the piezoelectric pump is disposed between the sticking member and the breathable member. The said water sealing member is comprised with at least 1 material chosen from a water absorbing polymer, PVA sponge, a water absorbing fiber, and a hydrophobic membrane, The statement to any one of Claims 1-4 characterized by the above-mentioned. The negative pressure closure therapy device described. The permeable member is a negative pressure wound therapy device according to any one of claims 1 to 5, characterized in that it is composed of gauze.

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