Wound retractor

Abstract

The application discloses a wound puller and belongs to the field of medical supplies. The wound puller comprises a wound pulling unit, a first pull strip and a second pull strip which are arranged oppositely and whose central axes are located on the same vertical plane, a skin sticking unit fixedly connected with the first pull strip on one side and a skin sticking unit fixedly connected with the second pull strip on the other side, a guide hole in the free end of the first pull strip for the second pull strip to pass through, and a fixing device arranged on the adjacent contact surface of the first pull strip and the second pull strip. The first pull strip and the second pull strip have a first state of relatively freely moving along the axis direction of the guide hole under the constraint of the guide hole and a second state of fixing the relative position of the first pull strip and the second pull strip after the fixing device fixes the upper and lower overlapping parts. In the process of bidirectional pulling and closing, the stress direction is basically on the same horizontal line, and the fixed position is the overlapping part in the middle of the pull strips. In this way, the suture force can be symmetrically transmitted along the middle, so that the force is evenly distributed to the skin sticking units on the two sides.

Description

Technical Field

[0001] This invention relates to the field of medical supplies, and more particularly to a wound closing device. Background Technology

[0002] A wound closeer is a device used to close a wound to promote healing. Common wound closeers use opposing pull units to bring together adhesive units on both sides of the wound, thereby pulling the wound towards the center.

[0003] Conventional wound closure units typically employ a ratchet or counter-pulling strap locking structure. The disadvantages of this type of locking structure are that all components of the wound closure locking device require a certain degree of rigidity, making it impossible to achieve flattening or material softening. The protruding parts can easily scratch the skin or become caught, causing detachment. Furthermore, it can cause a foreign body sensation in areas where the skin folds, such as joints. For a detailed structural description, please refer to patent document CN212756146U, its appendix... Figure 1 and Figure 2 The embodiment shown employs a ratchet locking structure, which has... Figure 6 The embodiment shown employs a counter-pull strap locking structure.

[0004] Secondly, the fixing points of conventional wound closure and locking devices are usually located above one or both adhesive units. The closure and locking force is transmitted from the connection between the closure unit and the barb to the adhesive unit, resulting in uneven force distribution. In particular, the single-sided closure method with the barb is prone to uneven force application, and replacing the barb with a single-sided closure strap presents the same problem. In the counter-closure strap locking structure, due to the misaligned arrangement of the closure mechanism, twisting can easily occur when closing the skin. Some structures on the market that use misaligned barbs to achieve bidirectional counter-closure also suffer from the same issue.

[0005] In addition, existing wound closure units also employ a pull-bar locking structure using a reverse-folding adhesive fixing method. For details, please refer to patent document CN213665484U. This wound closure unit consists of a starting section, a free section, and a fixed section arranged sequentially. The starting section of the wound closure unit is fixedly connected to an adhesive unit on one side. On the adhesive unit on the other side, there are limiting walls for guiding and limiting the two sides of the free section. The free section can freely pass through the limiting channel between the two limiting walls, and the width of the corresponding mating part on the free section with the two limiting walls is adapted to the width of the limiting channel between the two limiting walls. An adhesive layer is provided on the fixed section, and a crossbeam is provided between the two limiting walls. The free section folds back after passing around the crossbeam, and the fixed section selectively connects to the adhesive unit fixedly connected to the starting section after folding back. In the actual manufacturing process of this product, the crossbeam shaft, as well as the limiting retaining wall and limiting channel that fix the crossbeam shaft, usually need a certain degree of hardness and thickness to ensure that the crossbeam shaft will not break when the pull strip is folded back and pulled together. In clinical use, excessively thick and hard sheet materials are prone to causing cuts at the edge tension convergence points on skin with good elasticity, and excessively thick sheets cannot stretch with the skin, making the bottom adhesive surface prone to detachment. This solution reduces the overall thickness of the adhesive unit on one side to a minimum, but the thickness and hardness of the other side cannot reach the ideal state. Furthermore, when this type of wound closure unit is implemented, the fixing point is also located above one of the adhesive units on one side, resulting in uneven force distribution and easily causing tension convergence on one side. Summary of the Invention

[0006] The technical problem solved by this invention is to provide a wound closure device with more uniform mechanical distribution and improved wound closure effect.

[0007] The technical solution adopted by the present invention to solve its technical problem is: a wound closing device, including a wound closing unit and a skin adhesive unit; the skin adhesive unit is used to adhere and fix the skin surface on both sides of the wound, and the wound closing unit connects the skin adhesive units on both sides; the wound closing unit includes a first pull bar and a second pull bar whose central axes are located on the same vertical plane and are arranged opposite to each other, the first pull bar is fixedly connected to the skin adhesive unit on one side, and the second pull bar is fixedly connected to the skin adhesive unit on the other side, the free end of the first pull bar has a guide hole for the second pull bar to pass through, the adjacent contact surfaces of the first pull bar and the second pull bar are provided with a fixing device, the first pull bar and the second pull bar have a first state in which they can move relatively freely along the axis of the guide hole under the constraint of the guide hole, and a second state in which their relative positions are fixed after being fixed by the fixing device at the upper and lower overlapping parts.

[0008] Furthermore, the fixing device is an adhesive, double-sided tape, or a fixing device with an interlocking surface; an anti-adhesion layer is temporarily covered on the outer surface of the fixing device.

[0009] Furthermore, the free end of the first pull bar has a widened first handle portion, the width of which is greater than the width of the first pull bar. A guide hole for the second pull bar to pass through is provided in the width direction of the first handle portion. When the number of first pull bars is greater than one set, adjacent first handle portions are connected and merged with each other in the width direction.

[0010] Furthermore, the free end of the second pull bar has a widened second handle portion. When the number of second pull bars is greater than one set, adjacent second handle portions are connected and merged with each other in the width direction.

[0011] Furthermore, the skin adhesive unit includes a flexible elastic adhesive layer for direct adhesion to the skin surface and a base band fixedly disposed on the flexible elastic adhesive layer. The base band is disposed on the wound side of the flexible elastic adhesive layer, and the outer edge of the base band does not extend beyond the outer edge area of ​​the flexible elastic adhesive layer. The fixing ends of the first pull strip are connected to the first pull strip fixing part, and the fixing ends of the second pull strip are connected to the second pull strip fixing part. The first pull strip fixing part and the second pull strip fixing part are respectively fixedly connected to the corresponding base band, and there is no direct connection between them and the flexible elastic adhesive layer.

[0012] Furthermore: the baseband area corresponding to the first pull bar fixing part is larger than the area of ​​the first pull bar fixing part, and a baseband edge area not covered by the first pull bar fixing part is formed on the outer peripheral edge or the entire circumference edge of the baseband. The baseband includes a strip-shaped baseband body, and the outer edge of the baseband body is set as a smooth "finger-like" protruding shape extending outward. The baseband area corresponding to the second pull bar fixing part is larger than the area of ​​the second pull bar fixing part, and a baseband edge area not covered by the second pull bar fixing part is formed on the outer peripheral edge or the entire circumference edge of the baseband. The baseband includes a strip-shaped baseband body, and the outer edge of the baseband body is set as a smooth "finger-like" protruding shape extending outward.

[0013] Furthermore, the skin adhesive unit also includes an upper flexible elastic adhesive layer covering the flexible elastic adhesive layer and the base band surface; the first pull strip fixing part and its corresponding base band are fixedly disposed between the flexible elastic adhesive layer and the upper flexible elastic adhesive layer on one side, and the second pull strip fixing part and its corresponding base band are similarly fixedly disposed between the flexible elastic adhesive layer and the upper flexible elastic adhesive layer on the other side; a shaping protective paper is pre-set on the upper surface of the upper flexible elastic adhesive layer.

[0014] Regarding the fixing method of the pull strip, the present invention also provides a preferred embodiment in which a base band is no longer independently set: the skin adhesive unit includes a flexible elastic adhesive layer for direct adhesion to the skin surface, the fixing ends of the first pull strip are connected to the first pull strip fixing part, the fixing ends of the second pull strip are connected to the second pull strip fixing part, the first pull strip fixing part and the second pull strip fixing part are respectively fixedly connected to the wound side of the corresponding flexible elastic adhesive layer; all the four edges of the first pull strip fixing part do not exceed the four outer edges of the corresponding flexible elastic adhesive layer, and the area of ​​the flexible elastic adhesive layer not covered and fixed by the first pull strip fixing part forms a flexible buffer zone; all the four edges of the second pull strip fixing part do not exceed the four outer edges of the corresponding flexible elastic adhesive layer, and the area of ​​the flexible elastic adhesive layer not covered and fixed by the first pull strip fixing part forms a flexible buffer zone. The preferred external structure of the pull strip fixing part is as follows: the first pull strip fixing part includes an elongated first fixing piece body, the outer edge of which is set as a smooth, finger-like protruding shape extending outward; the second pull strip fixing part includes an elongated second fixing piece body, the outer edge of which is set as a smooth, finger-like protruding shape extending outward. In a further preferred embodiment, the skin adhesive unit further includes an upper flexible elastic adhesive layer covering the flexible elastic adhesive layer and the surface of the pull strip fixing part; the first pull strip fixing part is fixedly disposed between the flexible elastic adhesive layer and the upper flexible elastic adhesive layer on one side, and the second pull strip fixing part is similarly fixedly disposed between the flexible elastic adhesive layer and the upper flexible elastic adhesive layer on the other side; a shaping protective paper is pre-set on the upper surface of the upper flexible elastic adhesive layer.

[0015] Furthermore, the system includes a support frame assembly and a wound dressing assembly. The support frame assembly is located between the two skin-adhesive units, and the wound dressing assembly is installed at the bottom of the support frame assembly. The support frame assembly consists of an upper wing plate, a lower wing plate, and a vertical web plate, with an "I"-shaped cross-section. The web plate has spaced holes for the first and second pull rods to pass through. The lower wing plate serves as a guide rail to connect to the guide groove at the top of the dressing assembly. The guide groove of the dressing assembly can slide freely along the long axis of the guide rail or slide out of both ends of the guide rail to release the sliding connection with the guide rail. The guide groove surrounds the guide rail, and the groove edge fits into the web plate. The groove edges at both ends of the guide groove are set as inwardly extending "V" shapes, guiding the groove edge from the widest part of the "V" shape to transition to a constrained fit with the web plate. The ends of the guide rail have V-shaped guide heads that are adapted to the groove opening.

[0016] Furthermore, a first pull bar and a second pull bar corresponding to each other constitute a set of pull bars. Each set of pull bars passes through the same pull bar hole, and each set of pull bars is axially constrained by the pull bar hole and guide hole at two different positions on the same axis in the long axis direction.

[0017] Furthermore, the wound dressing assembly consists of a hemostatic or antibacterial dressing and a porous membrane covering the dressing; the edges of the porous membrane are sealed by heat fusion or ultrasonic welding.

[0018] The beneficial effects of this invention are as follows: The wound closure device of this invention employs a first and a second pull strip with their central axes located on the same vertical plane and arranged opposite to each other (i.e., the pull strips on both sides are arranged symmetrically or approximately symmetrically). A guide hole adapted to the second pull strip is provided on the first pull strip. During implementation, the first and second pull strips can form an overlapping portion rather than being staggered. After closure, the upper and lower pull strips can be glued and fixed in the middle position. During bidirectional closure, the force direction is basically on the same horizontal line, and the fixed position is the overlapping portion in the middle of the pull strips. This allows the suturing force to be transmitted symmetrically along the middle, thereby evenly distributing the force to the skin adhesive units on both sides, effectively improving the wound closure effect. Furthermore, with the above structural design of this invention, both the first and second pull strips can be flattened, requiring lower material hardness and allowing the use of flexible, non-elastic materials. This reduces the risk of skin damage during implementation and provides a better tactile experience for the patient.

[0019] In a preferred embodiment, the skin-adhesive unit includes a flexible elastic adhesive layer for direct adhesion to the skin surface and a base band fixedly disposed on the flexible elastic adhesive layer. After the pull bar evenly distributes the force to the base bands on both sides, the base bands can achieve better stress dispersion. The outer edge of the base band body is set as a smooth "finger-like" protruding shape extending outward, which can further enhance the stress dispersion effect. The first pull bar fixing part and its corresponding base band are fixedly disposed between the flexible elastic adhesive layer and the upper flexible elastic adhesive layer on one side, and the second pull bar fixing part and its corresponding base band are similarly fixedly disposed between the flexible elastic adhesive layer and the upper flexible elastic adhesive layer on the other side. A shaping protective paper is pre-set on the upper surface of the upper flexible elastic adhesive layer. Both the upper and lower flexible elastic adhesive layers on the same side can be made of elastic material that mimics the elasticity variables of the skin, stretching in accordance with the movement of the skin. However, their material is too soft, and their shape cannot be fixed. They are easy to stick together after being removed from the release paper. Therefore, the top layer is attached with shaping protective paper to fix the puller inside the flexible material and ensure the fixed shape of the entire puller. Attached Figure Description

[0020] Figure 1 This is a three-dimensional schematic diagram of a specific embodiment of the wound closure device described in this invention.

[0021] Figure 2 This is a top view schematic diagram of a specific embodiment of the wound closure device described in this invention.

[0022] Figure 3This is a schematic diagram of the fixing structure of the first tie rod.

[0023] Figure 4 This is a schematic diagram of the fixing structure of the second tie rod.

[0024] Figure 5 This is a three-dimensional schematic diagram of another specific embodiment of the wound closure device described in this invention.

[0025] Figure 6 This is a three-dimensional schematic diagram of another specific embodiment of the support frame assembly and dressing assembly described in this invention.

[0026] Figure 7 for Figure 6 The front view.

[0027] Figure 8 for Figure 7 AA section view in the image.

[0028] Figure 9 This is a schematic diagram of the fixing structure of the first pull bar in another specific embodiment.

[0029] Figure 10 This is a schematic diagram of the fixing structure of the second pull bar in another specific embodiment.

[0030] The components in the diagram are labeled as follows: support frame assembly 100, pull bar hole 101, web plate 102, guide rail 103, V-shaped guide head 104, wound dressing assembly 200, guide groove 201, V-shaped guide opening 202, wound closing unit 300, first pull bar 301, guide hole 3011, first handle part 3012, first pull bar fixing part 3013, second pull bar 302, second handle part 3021, second pull bar fixing part 3022, fixing device 303, release protective paper 304, skin adhesive unit 400, flexible adhesive layer 401, base band 402, base band edge area 403, upper flexible elastic adhesive layer 404, and flexible buffer zone 405. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0032] It should be noted that if the present invention uses directional indicators such as up, down, left, right, front, and back, these are for the purpose of describing the relative positional relationship between components, and are not for the absolute positional relationship between related components. They are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicator will also change accordingly.

[0033] like Figures 1 to 10As shown, the present invention includes a wound closure unit 300 and a skin adhesive unit 400; the skin adhesive unit 400 is used to adhere and fix to the skin surface on both sides of the wound, and the wound closure unit 300 connects the skin adhesive units 400 on both sides; the wound closure unit 300 includes a first pull bar 301 and a second pull bar 302 whose central axes are located in the same vertical plane and are arranged opposite to each other (the central axis of the first pull bar 301 and the second pull bar 302 refers to the center line of the long axis of a single strip pull bar body), and the first pull bar 301 is connected to one side of the skin adhesive unit 400. The first pull bar 301 is fixedly connected to the second pull bar 302 and the skin adhesive unit 400 on the other side. The free end of the first pull bar 301 has a guide hole 3011 for the second pull bar 302 to pass through. The adjacent contact surfaces of the first pull bar 301 and the second pull bar 302 are provided with a fixing device 303. The first pull bar 301 and the second pull bar 302 have a first state in which they can move relatively freely along the axis of the guide hole 3011 under the constraint of the guide hole 3011, and a second state in which their relative positions are fixed after being fixed by the fixing device 303 at the overlapping part.

[0034] In this invention, the two pull strips are arranged symmetrically or approximately symmetrically, and a guide hole 3011 adapted to the second pull strip 302 is provided on the first pull strip 301 (that is, the size of the guide hole 3011 is adapted to the size of the second pull strip 302). In implementation, the first pull strip 301 and the second pull strip 302 can form an overlapping part rather than a staggered arrangement. After being pulled together, the upper and lower pull strips can be fixed in the middle position. This middle position only refers to the area between the two skin adhesive units 400, and is not necessarily the exact middle position of a set of pull strips.

[0035] The fixing device 303 can be an adhesive or a double-sided adhesive layer, or a fixing device with an interlocking surface (such as "Hook and Velcro"). It is understood that, depending on the selection of the fixing device 303, it can be fixed to either of the adjacent contact surfaces of the first pull bar 301 and the second pull bar 302, or it can be respectively set on the outer surfaces of the two pull bars. For example, it can be set on the first pull bar 301 and the second pull bar 302 using adhesive or a double-sided adhesive layer; if "Hook and Velcro" is used, one has a "female buckle" and the other has a "female buckle." To avoid affecting operation during pulling and closing, a temporary anti-adhesion layer, such as release paper 304, is temporarily covered on the surface of the fixing device 303. This allows the first pull bar 301 and the second pull bar 302 to move freely along the long axis of the guide hole 3011 under the constraint of the guide hole 3011. Removing the release paper 304 achieves the second state, where the relative positions of the two are fixed.

[0036] In this embodiment, the preferred solution is double-sided high-strength adhesive tape with a release liner 304. One side of the double-sided high-strength adhesive tape is pre-fixed to any one of the pull strips. After pulling in place, the release liner is removed to achieve the bonding and fixation of the upper and lower pull strips. A corresponding first pull strip 301 and a second pull strip 302 constitute a set of pull strips. During the bidirectional pulling process, the force direction of the same set of pull strips is basically on the same horizontal line, and the fixing position is the overlapping part in the middle of the pull strips. In this way, the suturing force can be transmitted completely symmetrically along the middle, thereby distributing the force evenly to the skin adhesive units on both sides, effectively improving the wound closure effect. In addition, with the above-mentioned structural design of the present invention, both the first pull strip 301 and the second pull strip 302 can be flattened, with lower requirements for material hardness. They can be made of flexible non-elastic materials (the specific material can be flexibly selected by those skilled in the art based on their technical knowledge). During implementation, it is less likely to damage the skin, and the patient's touch is also better.

[0037] The aforementioned "symmetrical arrangement" means that, disregarding the difference in guide holes 3011, the structure of the tie rods on both sides is completely symmetrical. "Approximately symmetrical arrangement" means that even if the width and length dimensions of the tie rods on both sides are slightly different, as long as their central axes are aligned, ensuring that the force direction of the same set of tie rods is basically on the same horizontal line, and that the bonding fixing point is in the middle area, the preferred solution is a symmetrical arrangement.

[0038] Preferably, the free end of the first pull bar 301 has a widened first handle portion 3012, the width of which is greater than the width of the first pull bar 301. A guide hole 3011 for the second pull bar 302 to pass through is provided in the width direction of the first handle portion 3012. When the number of first pull bars 301 is greater than one set, adjacent first handle portions 3012 are connected and merged in the width direction, that is, multiple first pull bars 301 share one first handle portion 3012, which is convenient for medical personnel to operate with one hand. With this design, the width of the guide hole 3011, the width of the strip body of the first pull bar 301, and the width of the strip body of the second pull bar 302 can be designed to be the same, thereby achieving a completely symmetrical arrangement of the pull bars on both sides, which is beneficial for force balance.

[0039] Similarly, the free end of the second pull bar 302 has a widened second handle portion 3021. When the number of second pull bars 302 is greater than one set, adjacent second handle portions 3021 are connected and merged in the width direction, that is, multiple second pull bars 302 share one second handle portion 3021, which is convenient for medical staff to operate with one hand.

[0040] It is understandable that, depending on the length of the wound, one or more sets of pull strips can be set. The above-mentioned scheme of setting the first pull part 3012 and the second pull part 3021 is preferably used in combination. With this structure, it is convenient for doctors to operate. When pulling in both directions, they only need to pinch the first pull part 3012 and the second pull part 3021 with their fingers respectively. By connecting multiple pull strips together with the pull parts, doctors can complete the pulling in one go without having to perform multiple operations. Furthermore, due to the restriction of the second pull part 3021, the second pull part 3021 cannot slide out in the opposite direction and disengage from the guide hole 3011, which is beneficial to the stability of the structure. Referring to the implementation process described above, the fixing device 303 (preferably double-sided high-strength adhesive tape) generally only needs to be pre-fixed to any one of the pull strips in the same set of pull strips, and then the release paper 304 is set accordingly. The shape of the release liner 304 should be designed to facilitate one-time tearing. It can generally consist of multiple strips and a tearing end, with the strips and the pull strip body corresponding to each other.

[0041] To facilitate product manufacturing, the preferred structural configuration is as follows: the fixed ends of the first pull strip 301 are connected to the first pull strip fixing part 3013, and the fixed ends of the second pull strip 302 are connected to the second pull strip fixing part 3022. The first pull strip fixing part 3013 and the second pull strip fixing part 3022 are respectively fixedly connected to the corresponding skin adhesive unit 400. The skin adhesive unit 400 includes a flexible elastic adhesive layer 401 for direct adhesion to the skin surface and a base band 402 fixedly disposed on the flexible elastic adhesive layer 401. The base band 402 is disposed on the wound side of the flexible elastic adhesive layer 401, and the outer edge of the base band 402 does not extend beyond the outer edge area of ​​the flexible elastic adhesive layer 401. The first pull strip fixing part 3013 and the second pull strip fixing part 3022 are respectively fixedly connected to the corresponding base band 402, and are not directly connected to the flexible elastic adhesive layer 401. During the pulling process, the sewing force is symmetrically transmitted from the middle position to the root of the pull strip on both sides. After the pull strip evenly distributes the force to the base strip 402 on both sides, the base strip 402 can achieve better stress dispersion.

[0042] The area of ​​the baseband 402 corresponding to the first tensioner fixing part 3013 is larger than the area of ​​the first tensioner fixing part 3013. In this area comparison, "first tensioner fixing part 3013" only refers to the fixing part that coincides with the upper surface of the baseband 402. A baseband edge area 403 that is not covered by the first tensioner fixing part 3013 is formed on the outer periphery edge or the entire edge of the baseband 402. Similarly, the area of ​​the baseband 402 corresponding to the second tensioner fixing part 3022 is larger than the area of ​​the second tensioner fixing part 3022. A baseband edge area 403 that is not covered by the second tensioner fixing part 3022 is formed on the outer periphery edge or the entire edge of the baseband 402. The basebands 403 on both sides can be ordinary strip-shaped basebands. To achieve better stress dispersion, the basebands 402 on both sides have the same structure, both including a strip-shaped baseband body. The outer edge of the baseband body is set as a smooth, finger-like protrusion extending outward. It can be understood that the inner side of the baseband body refers to its side near the wound, and the outer side refers to its side away from the wound. Each baseband 402 can have one or more finger-like protrusions. "Finger-like" refers to a long strip structure.

[0043] The flexible elastic adhesive layer 401 is a relatively soft adhesive component, such as a flexible thin-film adhesive tape or a flexible soft adhesive strip. It is used to attach the skin adhesive unit 400 to the skin surface around the wound. The use of a relatively soft material is to improve the effective adhesion between the flexible elastic adhesive layer 401 and the skin, and to ensure effective adhesion through the flexible deformation of the flexible elastic adhesive layer 401. The base band 402 is made of a material that is "harder" than the flexible elastic adhesive layer 401 and is not easily stretched or deformed. For example, it can be a dense polymer sheet material. The base band 402 is used to conduct and disperse the tensile force of the wound, so that the tensile force is more evenly distributed on the flexible elastic adhesive layer 401, thus avoiding excessive concentration of skin tension caused by excessive deformation of the flexible elastic adhesive layer 401. The first tension strip fixing part 3013 and the second tension strip fixing part 3022 can generally be made of the same material as the tension strip. Through the transition effect of the soft edge area 403 of the base band, the strong suture tension is "gradually reduced" and evenly distributed to a larger area of ​​the skin surface. Therefore, the tension force on the skin can be more evenly distributed, avoiding excessive concentration of skin tension force and causing skin damage such as skin strain and tension blisters.

[0044] See Figures 3 to 5The skin-adhesive unit 400 further includes an upper flexible elastic adhesive layer 404 covering the surfaces of the flexible elastic adhesive layer 401 and the base band 402; a first pull strip fixing part 3013 and its corresponding base band 402 are fixedly disposed between the flexible elastic adhesive layer 401 and the upper flexible elastic adhesive layer 404 on one side, and a second pull strip fixing part 3022 and its corresponding base band 402 are similarly fixedly disposed between the flexible elastic adhesive layer 401 and the upper flexible elastic adhesive layer 404 on the other side; a molding protective paper is pre-installed on the upper surface of the upper flexible elastic adhesive layer 404. It is understood that the lower flexible elastic adhesive layer 401, to adhere to the skin, preferably has its own adhesive layer and is attached with release paper. With the above-described structure, both the upper and lower flexible elastic adhesive layers on the same side can be made of elastic materials that mimic the elasticity of skin, making them relatively softer and better able to adapt to skin movements and stretch. However, considering that the material of the flexible elastic adhesive layer is too soft and its shape cannot be fixed, it is easy for them to stick together after being removed from the release paper. Therefore, this invention attaches a shaping protective paper to the top layer to fix the puller inside the flexible material and ensure the fixed shape of the entire puller (ensuring that the upper and lower flexible elastic adhesive layers are flat, do not curl, and do not peel). After being fixed to the skin surface, the shaping protective paper 404 is removed to restore the softness and elasticity of the upper and lower flexible elastic adhesive layers. In practice, the "upper flexible elastic adhesive layer 404 and its shaping protective paper" and the "lower flexible elastic adhesive layer 401 and release paper" can be pre-processed into integral structures, and then formed as a whole using a static pressing process.

[0045] Regarding the fixing method of the pull strip, the present invention also provides a preferred embodiment in which the base strip 402 is no longer independently set: see [reference] Figure 9 and Figure 10 The skin adhesive unit 400 includes a flexible elastic adhesive layer 401 for direct adhesion to the skin surface. The fixing ends of the first pull strip 301 are connected to the first pull strip fixing part 3013, and the fixing ends of the second pull strip 302 are connected to the second pull strip fixing part 3022. The first pull strip fixing part 3013 and the second pull strip fixing part 3022 are respectively fixedly connected to the wound side of the corresponding flexible elastic adhesive layer 401. All the edges of the first pull strip fixing part 3013 do not extend beyond the outer edge area of ​​the corresponding flexible elastic adhesive layer 401. The area of ​​the flexible elastic adhesive layer 401 not covered and fixed by the first pull strip fixing part 3013 forms a flexible buffer zone 405. All the edges of the second pull strip fixing part 3022 do not extend beyond the outer edge area of ​​the corresponding flexible elastic adhesive layer 401. The area of ​​the flexible elastic adhesive layer 401 not covered and fixed by the first pull strip fixing part 3013 forms a flexible buffer zone 405. In this scheme, the stress dispersion function can be directly achieved by the first tie rod fixing part 3013 and the second tie rod fixing part 3022.

[0046] The preferred external structure of the tie rod fixing part is as follows: the first tie rod fixing part 3013 includes an elongated first fixing plate body, the outer edge of which is set as a smooth, finger-like protrusion extending outward; the second tie rod fixing part 3022 includes an elongated second fixing plate body, the outer edge of which is set as a smooth, finger-like protrusion extending outward. It can be understood that the inner side of the tie rod fixing part refers to its side near the wound, and the outer side refers to its side away from the wound. Each tie rod fixing part may have one or more finger-like protrusions. "Finger-like" refers to an elongated structure. This "finger-like" structure can better achieve stress dispersion.

[0047] In the preferred embodiment without the baseband 402 described above, the skin-adhesive unit 400 may also be provided with an upper flexible elastic adhesive layer 404 covering the flexible elastic adhesive layer 401 and the surface of the pull strip fixing part; the first pull strip fixing part 3013 is fixedly disposed between the flexible elastic adhesive layer 401 and the upper flexible elastic adhesive layer 404 on one side, and the second pull strip fixing part 3022 is similarly fixedly disposed between the flexible elastic adhesive layer 401 and the upper flexible elastic adhesive layer 404 on the other side; a shaping protective paper is pre-distributed on the upper surface of the upper flexible elastic adhesive layer 404. For specific implementation details, please refer to the above-described scheme with the baseband 402.

[0048] This invention can also be used in conjunction with a support frame assembly 100. A wound dressing assembly 200 is provided at the bottom of the support frame assembly 100. The support frame assembly 100 has pull strip holes 101 for the first pull strip 301 and the second pull strip 302 to pass through. In implementation, the support frame assembly 100 and the wound dressing assembly 200 are located between the two skin adhesion units 400 and above the wound. The adhesive fixing points of the first pull strip 301 and the second pull strip 302 generally coincide with the pull strip holes 101. For ease of operation, the fixing device 303 generally adopts a preferred solution with a built-in release liner 304. The release liner 304 extends along the adhesive surface to a length that can be operated by both hands, and multiple release liners are connected together at the tail (i.e., multiple pull strips share one release liner 304, making it convenient for doctors to remove the release liner at once). The wound dressing assembly 200 can be fixed to the bottom of the support frame assembly 100 via a sliding connector. For ease of operation, refer to [reference needed]. Figures 6 to 8The preferred structural configuration is as follows: the support frame assembly 100 consists of an upper wing plate, a lower wing plate, and a vertical web plate 102, with an "I" shaped cross-section. The web plate 102 has spaced-apart pull rod holes 101 for accommodating the passage of the first pull rod 301 and the second pull rod 302. The lower wing plate serves as a guide rail 103 to connect to the guide groove 201 at the top of the dressing assembly 200. The guide groove 201 of the dressing assembly 200 can slide freely along the long axis of the guide rail 103 or slide out of both ends of the guide rail 103, releasing its sliding connection with the guide rail 103. The guide groove 201 encircles the guide rail 103, and the groove edge of the guide groove 201 fits into the web plate 102 (generally a clearance fit; the groove edges at both ends of the guide groove 201 are set as...). The inwardly extending "V" shape (i.e., the V-shaped guide opening 202 shown in the figure) guides the groove 201, whose edge transitions from the widest part of the "V" shape to a constrained fit with the web 102, meaning the wide side of the V-shaped guide opening 202 faces outward and the narrow side faces inward. The end of the guide rail 103 has a V-shaped guide head 104 that matches the groove of the guide groove 201. Correspondingly, the narrow side of the V-shaped guide head 104 faces outward and the wide side faces inward, gradually transitioning from a narrower end to the same width as the guide rail 103 body. With the above structure, the separation and assembly between the support frame assembly 100 and the wound dressing assembly 200 can be easily achieved, thus facilitating the change of wound dressings by medical personnel.

[0049] It is understandable that one pull strip hole 101 can correspond to a group of pull strips or multiple groups of pull strips at the same time. The preferred solution is that each group of pull strips passes through the same pull strip hole 101. Each group of pull strips is axially constrained by the pull strip hole 101 and the guide hole 3011 at two different positions on the same axis in the long axis direction, which can better ensure that the sewing force on both sides is distributed along the same straight line.

[0050] Specifically, the wound dressing assembly 200 consists of a hemostatic dressing or antibacterial dressing and a porous membrane covering the dressing; the edges of the porous membrane are sealed by heat fusion or ultrasonic welding.

Claims

1. A wound retractor comprising a wound retraction unit (300) and a skin adhesive unit (400); the skin adhesive unit (400) is used to adhere to the skin surface on both sides of the wound, and the wound retraction unit (300) is connected to the skin adhesive unit (400) on both sides; characterized in that: The wound pulling unit (300) comprises a first pull strip (301) and a second pull strip (302) which are located in the same vertical plane and are oppositely arranged, the first pull strip (301) is fixedly connected with the skin sticking unit (400) on one side, the second pull strip (302) is fixedly connected with the skin sticking unit (400) on the other side, the free end of the first pull strip (301) is provided with a guide hole (3011) for the second pull strip (302) to pass through, the adjacent contact surfaces of the first pull strip (301) and the second pull strip (302) are provided with a fixing device (303), the first pull strip (301) and the second pull strip (302) have a first state of relatively freely moving along the axis direction of the guide hole (3011) under the constraint of the guide hole (3011), and a second state of fixing the relative positions of the first pull strip (301) and the second pull strip (302) after the upper and lower overlapping parts are fixed by the fixing device (303); the free end of the first pull strip (301) is provided with a widened first handle part (3012), the width of the first handle part (3012) is greater than the width of the first pull strip (301), the guide hole (3011) for the second pull strip (302) to pass through is arranged in the width direction of the first handle part (3012), the number of the first pull strips (301) is greater than one group, and the adjacent first handle parts (3012) are connected and fused in the width direction; the free end of the second pull strip (302) is provided with a widened second handle part (3021), the number of the second pull strips (302) is greater than one group, and the adjacent second handle parts (3021) are connected and fused in the width direction.

2. The wound retractor of claim 1, wherein: The fixing device (303) is an adhesive, a double-sided adhesive paste layer or a fixing device with a surface occlusion fixing relationship; a temporary anti-adhesion separation layer is temporarily covered on the outer surface of the fixing device (303).

3. The wound retractor of claim 1, wherein: The skin pasting unit (400) comprises a flexible and elastic pasting layer (401) for being directly pasted on the surface of the skin, and a base band (402) fixedly arranged on the flexible and elastic pasting layer (401), the base band (402) is arranged on the side close to the wound of the flexible and elastic pasting layer (401), and the outer edge of the base band (402) does not exceed the outer edge area of the flexible and elastic pasting layer (401); the fixed ends of the first pull strip (301) are connected to the first pull strip fixing part (3013) together, the fixed ends of the second pull strip (302) are connected to the second pull strip fixing part (3022) together, the first pull strip fixing part (3013) and the second pull strip fixing part (3022) are fixedly connected with the corresponding base band (402) respectively, and are not directly connected with the flexible and elastic pasting layer (401) partially; the area of the base band (402) corresponding to the first pull strip fixing part (3013) is greater than the area of the first pull strip fixing part (3013), the base band edge area (403) not covered by the first pull strip fixing part (3013) is formed on the outer peripheral partial edge or the whole-circle edge of the base band (402), the base band (402) comprises a strip-shaped base band body, and the outer side partial edge of the base band body is arranged in a smooth 'finger-shaped' protruding shape extending to the outer side; the area of the base band (402) corresponding to the second pull strip fixing part (3022) is greater than the area of the second pull strip fixing part (3022), the base band edge area (403) not covered by the second pull strip fixing part (3022) is formed on the outer peripheral partial edge or the whole-circle edge of the base band (402), the base band (402) comprises a strip-shaped base band body, and the outer side partial edge of the base band body is arranged in a smooth 'finger-shaped' protruding shape extending to the outer side.

4. The wound retractor of claim 3, wherein: The skin pasting unit (400) further comprises an upper flexible and elastic pasting layer (404) covering the surfaces of the flexible and elastic pasting layer (401) and the base band (402); the first pull strip fixing part (3013) and the corresponding base band (402) are fixedly arranged between the flexible and elastic pasting layer (401) and the upper flexible and elastic pasting layer (404) on one side, the second pull strip fixing part (3022) and the corresponding base band (402) are fixedly arranged between the flexible and elastic pasting layer (401) and the upper flexible and elastic pasting layer (404) on the other side; the upper surfaces of the upper flexible and elastic pasting layer (404) are all provided with a plastic protective paper.

5. The wound retractor of claim 1, wherein: The skin pasting unit (400) comprises a flexible and elastic pasting layer (401) for being directly pasted on the surface of the skin, the fixed ends of the first stay (301) are commonly connected to the first stay fixed part (3013), the fixed ends of the second stay (302) are commonly connected to the second stay fixed part (3022), the first stay fixed part (3013) and the second stay fixed part (3022) are respectively fixedly connected to the near-wound side of the corresponding flexible and elastic pasting layer (401); the periphery of the first stay fixed part (3013) does not exceed the periphery of the corresponding flexible and elastic pasting layer (401), the part of the flexible and elastic pasting layer (401) not covered by the first stay fixed part (3013) forms a flexible buffer zone (405), the periphery of the second stay fixed part (3022) does not exceed the periphery of the corresponding flexible and elastic pasting layer (401), the part of the flexible and elastic pasting layer (401) not covered by the first stay fixed part (3013) forms a flexible buffer zone (405); the first stay fixed part (3013) comprises a first fixed sheet body in a strip shape, the outer side of the first fixed sheet body is provided with a smooth "finger-shaped" protruding shape extending outward; the second stay fixed part (3022) comprises a second fixed sheet body in a strip shape, the outer side of the second fixed sheet body is provided with a smooth "finger-shaped" protruding shape extending outward.

6. The wound retractor of claim 5, wherein: The skin pasting unit (400) further comprises an upper flexible and elastic pasting layer (404) covering the surface of the flexible and elastic pasting layer (401) and the stay fixed part; the first stay fixed part (3013) is fixedly arranged between the flexible and elastic pasting layer (401) and the upper flexible and elastic pasting layer (404) on one side, the second stay fixed part (3022) is also fixedly arranged between the flexible and elastic pasting layer (401) and the upper flexible and elastic pasting layer (404) on the other side; the upper surface of the upper flexible and elastic pasting layer (404) is provided with a shaped protective paper.

7. The wound retractor of any one of claims 1 to 6, wherein: The application relates to a support frame assembly (100) and a wound dressing assembly (200), the support frame assembly (100) is located between two skin adhesive units (400), the wound dressing assembly (200) is installed at the bottom of the support frame assembly (100), the support frame assembly (100) is composed of an upper wing plate, a lower wing plate and a vertical web plate (102), the cross section is a "I-shaped" structure, first and second pull strips (301) and (302) are arranged on the web plate (102) at intervals, and pull strip holes (101) for accommodating the first and second pull strips (301) and (302) are arranged on the web plate (102); the lower wing plate is used as a guide rail (103) to connect a guide groove (201) at the top of the dressing assembly (200), the guide groove (201) of the dressing assembly (200) can freely slide in the long axis direction of the guide rail (103) or slide out of the two ends of the guide rail (103) to release the sliding connection relationship with the guide rail (103); the guide groove (201) surrounds the guide rail (103), the groove edge of the guide groove (201) is matched on the web plate (102), the groove edges of the two side ends of the guide groove (201) are arranged in a "V"-shaped form extending inward, the groove edge of the guide groove (201) is guided to start from the widest part of the "V"-shaped form and transition to the constraint matching relationship with the web plate (102); the end of the guide rail (103) is provided with a V-shaped guide head (104) matched with the groove of the guide groove (201).

8. The wound retractor of claim 7, wherein: A first pull strip (301) and a second pull strip (302) correspond to each other to form a group of pull strips, each group of pull strips corresponds to passing through a same pull strip hole (101), and each group of pull strips is axially constrained by the pull strip holes (101) and guide holes (3011) at two different positions on the same axis in the long axis direction.

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