Accurate skin expanding knife capable of controlling wounds

Abstract

The utility model relates to a precise skin expanding knife capable of controlling wounds. The precise skin expanding knife comprises a supporting frame, a transmission rod and two sets of oppositely-arranged knife assemblies. The supporting frame is provided with sliding ways matched with the two cutter assemblies so that the cutter assemblies can be connected with the supporting frame in a sliding mode. The transmission rod partially extends into the slide way and is in transmission connection with the two cutter assemblies at the same time, and the transmission rod is configured to control the distance between the blades of the two cutter assemblies at least according to the rotating angle and the rotating direction of the transmission rod so as to control the size of a wound formed by the skin expanding cutter.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a precise skin expander with controllable trauma. Background Art

[0002] Most interventional surgeries require skin expansion after puncture to meet the needs of inserting objects or operating instruments. At present, the commonly used operation is to simply expand the skin with a blade, which may not only cause accidental tissue damage, but also cause subsequent operations to become loose once the skin expansion is excessive, increase the patient's trauma area, and make postoperative wound healing difficult. Utility Model Content

[0003] In view of the above analysis, the utility model aims to provide a precise skin expander with controllable trauma to solve the above problems.

[0004] The purpose of this utility model is mainly achieved through the following technical solutions:

[0005] The utility model provides a precise skin expansion knife with controllable trauma, comprising a support frame, a transmission rod and two sets of knife assemblies arranged opposite to each other;

[0006] The support frame is provided with a slideway matched with two sets of tool assemblies, so that the tool assemblies are slidably connected to the support frame;

[0007] The transmission rod partially extends into the slideway and is simultaneously transmission-connected to the two sets of tool assemblies. The transmission rod is configured to at least control the spacing between the blades of the two sets of tool assemblies according to its rotation angle and rotation direction, so as to control the size of the wound formed by the skin expander.

[0008] Further, the transmission rod is configured to control the two sets of tool assemblies to move toward each other or move away from each other by controlling the rotation direction of the transmission rod, wherein the transmission rod includes a first rotation direction and a second rotation direction, and when the transmission rod rotates in the first rotation direction, the two sets of tool assemblies move toward each other; when the transmission rod rotates in the second rotation direction, the two sets of tool assemblies move away from each other;

[0009] The displacement of the tool assembly is controlled by controlling the rotation angle of the transmission rod.

[0010] Furthermore, the skin expansion knife also includes a passage for the guide wire to pass through;

[0011] The travel channel is limited by the transmission rod and two sets of tool assemblies;

[0012] The transmission rod is provided with a first passage, and the first passage extends from one end of the transmission rod to the other end;

[0013] A second travel passage is defined between the two sets of tool assemblies;

[0014] The second passage is connected with the first passage to form the passage.

[0015] Furthermore, the skin expansion knife further comprises a guide tube, and the guide tube is at least partially located in the passage;

[0016] The guide tube is provided with a guide channel for the guide wire to pass through;

[0017] Preferably, the length of the guide tube is greater than the length of the passage, and two ends of the guide tube extend from two ends of the passage respectively;

[0018] Preferably, the guide tube includes a pipe portion and a wide-mouth portion, the pipe portion is at least partially located in the travel channel, and the pipe portion is provided with the guide channel; the wide-mouth portion is located at the upper end of the pipe portion, and the shape of the wide-mouth portion is gradually expanding from bottom to top, and the diameter of at least the upper end of the wide-mouth portion is larger than the diameter of the travel channel, so as to ensure that the wide-mouth portion is always located above the transmission rod.

[0019] Further, the support frame includes a connected support platform and a support sleeve;

[0020] The support platform is provided with the slideway, and a first through hole and a passage communicating with the slideway;

[0021] The support sleeve is connected to the upper end surface of the support platform and is covered on the first through hole;

[0022] The supporting sleeve is provided with an assembly channel matched with the transmission rod, and the assembly channel is communicated with the first through hole.

[0023] Furthermore, both ends of the support platform are detachably provided with limiting elements;

[0024] The limiting element is provided with a slot for sliding of an adjacent tool assembly and a baffle for blocking another tool assembly.

[0025] Further, the transmission rod is rotatably connected to the support frame through the first through hole;

[0026] The transmission rod comprises a handle portion, a rod portion and a gear portion which are connected in sequence, wherein the gear portion is located inside the slideway; the handle portion is located outside the slideway; one end of the rod portion is connected to the handle portion, and the other end of the rod portion passes through the first through hole and is connected to the gear portion;

[0027] Part of the rod portion is located in the assembly channel, and the handle portion of the transmission rod is located above the support sleeve;

[0028] The slide frame is provided with a rack portion matched with the gear portion, and the rack portion is meshed with the gear portion.

[0029] Further, the tool assembly includes a slide and a blade, the slide is slidably connected to the slideway, one end of the blade is connected to the slide, and the other end of the blade extends from the passage, so that the blade can process the area to be expanded;

[0030] Preferably, the slide comprises a limit assembly part, a connecting part and a limit part which are connected in sequence, the limit assembly part and the limit part are respectively connected to two ends of the connecting part, and the limit assembly part and the limit part are located on the same side of the connecting part;

[0031] The inner side wall of the connecting portion is provided with the rack portion, and the rack portion extends from one end of the connecting portion to the other end of the connecting portion;

[0032] The position limiting assembly portion is connected to the blade;

[0033] When the skin expansion knife is in the initial state, the two sets of knife assemblies are opposite and staggered, the inner walls of the two limit assembly parts are in contact with each other, the distance between the two blades is zero, and the gear part is located between the two limit assembly parts;

[0034] Preferably, both ends of the slideway are open to allow the slide to slide unhindered;

[0035] The slide is provided with one of a matching slide groove and a slide rail, the slide is provided with the other of a matching slide groove and a slide rail, and the slide rail or the slide groove extends from one end to the other end of the outer side wall of the slide, and the slide groove or the slide rail extends from one end to the other end of the slide.

[0036] Furthermore, the slide also includes an assembly boss, which extends from the inner side wall of the position-limiting assembly portion to the inner side wall of the connecting portion, and the assembly boss is located directly below the rack portion, so that the gear portion is always located on the assembly boss;

[0037] Preferably, the position limiting assembly portion is provided with a card slot, and the blade is provided with a card connection portion matched with the card slot, so that the blade and the slide can be detachably connected;

[0038] Preferably, the blade comprises a blade body and the clamping portion, a connecting block is provided at the bottom of the clamping portion, and the clamping portion is mounted above the blade body through the connecting block;

[0039] The shape of the blade body is a right-angled trapezoid, the clamping portion is arranged on the right-angled waist of the right-angled trapezoid, and the upper bottom and the oblique side of the blade body are both provided with cutting edges;

[0040] The lower bottom of the blade body and the side wall on the same side of the clamping portion and the lower bottom are provided with a passing groove for forming a second passing channel;

[0041] When the skin expansion knife is in the initial state, the lower bottoms of the blade bodies of the two sets of tool assemblies are in contact with each other, and the side walls of the penetration grooves provided in the clamping parts of the two sets of tool assemblies are in contact with each other, so as to jointly limit the second penetration channel.

[0042] Furthermore, at least one damping column is provided at the upper end of the support sleeve;

[0043] The lower end surface of the handle portion is provided with at least one protrusion matched with the damping column, the damping column is located on the motion trajectory of the protrusion, and the distance between the protrusion and the upper end surface of the assembly sleeve is less than the height of the damping column, so that the damping column can produce a damping effect on the rotation of the protrusion, thereby realizing accurate control of the rotation angle of the transmission rod;

[0044] When there are multiple protrusions, the protrusions are evenly arranged around the outer side of the rod portion, and the protrusions are equidistant from the side wall of the rod portion;

[0045] Preferably, the upper end surface of the support sleeve is provided with two damping columns arranged opposite to each other, and the number of the protrusions is an even number;

[0046] The number of the protrusions is 4 to 12.

[0047] Compared with the prior art, the present invention can achieve at least one of the beneficial effects: by rotating the transmission rod, the distance between the blades of the two sets of tool assemblies can be controlled, thereby controlling the size of the wound formed thereby, so that a wound size that meets the subsequent operation can be formed at the site to be expanded. On the one hand, the problem of subsequent operation difficulties, looseness, and difficulty in wound healing caused by a wound that is too large can be avoided; on the other hand, the problem of requiring a secondary skin expansion due to a wound that is too small, which increases the complexity of the operation and causes secondary injuries can be avoided.

[0048] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the following content, and some advantages can be obvious from the description or understood by implementing the present invention. The purpose and other advantages of the present invention can be achieved and obtained through the contents specifically pointed out in the text and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The accompanying drawings are only used for the purpose of illustrating specific embodiments and are not to be considered as limiting the present invention. In the entire drawings, the same reference symbols represent the same components.

[0050] Figure 1Schematic diagram of the structure of the skin expansion knife in a specific implementation manner (I);

[0051] Figure 2 This is a schematic diagram of the structure of a skin expansion knife in a specific implementation manner (II);

[0052] Figure 3 It is a cross-sectional view of a skin expansion knife in a specific implementation manner;

[0053] Figure 4 This is a schematic diagram of the structure of the support frame in a specific implementation manner:

[0054] Figure 5 It is a structural schematic diagram of a support frame after the limiting element is removed in a specific implementation manner;

[0055] Figure 6 It is a cross-sectional view of the support frame after the limiting element is removed in a specific implementation manner;

[0056] Figure 7 It is a structural schematic diagram of a limiting element in a specific implementation manner;

[0057] Figure 8 It is a structural schematic diagram of a transmission rod in a specific implementation manner;

[0058] Fig. 9 is a cross-sectional view of a transmission rod in a specific implementation manner;

[0059] Fig.10 It is a structural schematic diagram of a guide tube in a specific implementation manner;

[0060] Fig.11 This is a schematic diagram of the structure of the skin expansion knife after removing the support frame and the guide tube in a specific implementation manner;

[0061] Fig.12 It is a cross-sectional view of the skin expansion knife in a specific implementation manner after the support frame and the guide tube are removed;

[0062] Fig.13 It is a schematic diagram of the assembly of two sets of tool assemblies in a specific implementation manner (I);

[0063] Fig.14 It is a schematic diagram of the assembly of two sets of tool assemblies in a specific implementation manner (II);

[0064] Fig.15 is a schematic diagram of the structure of the tool assembly in a specific implementation manner (I);

[0065] Fig.16 is a structural schematic diagram of a tool assembly in a specific implementation manner (II);

[0066] Fig.17 It is a structural schematic diagram of a slide in a specific implementation manner;

[0067] Fig.18 is a schematic diagram of the structure of a blade in a specific implementation manner (I);

[0068] Fig.19 is a schematic diagram of the structure of the blade in a specific implementation manner (II);

[0069] Fig. 20 is a schematic diagram of the structure of the blade in a specific implementation manner (III);

[0070] Fig.21 is a schematic diagram of the structure of the blade in a specific implementation manner (IV);

[0071] Fig. 22 Schematic diagram of the structure of the blade in a specific implementation manner (V).

[0072] Reference numerals:

[0073] 1-support frame; 101-slideway; 102-first through hole; 103-passing opening; 104-slide groove; 105-assembly channel; 11-support platform; 12-support sleeve; 121-damping column; 2-tool assembly; 201-second passing channel; 202-passing groove; 21-slide; 211-rack portion; 212-limiting assembly portion; 212a-slot; 212b-groove; 213-connecting portion; 214-limiting portion; 215-assembly boss; 216-slide; 22-blade; 221-clamping portion; 221a-boss; 221b-connecting block; 222-blade body; 3-transmission rod; 301-first passing channel; 31-handle portion; 32-rod portion; 33-gear portion; 4-guide tube; 41-pipe portion; 42-wide mouth portion. DETAILED DESCRIPTION

[0074] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0075] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the term "connected" should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection, or an integral connection can be a mechanical connection, or an electrical connection can be a direct connection, or it can be indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0076] The terms "top", "bottom", "above", "lower", and "on" used throughout the description are relative to the relative positions of components of a device, such as the relative positions of the top and bottom substrates within a device. It is understood that devices are multifunctional regardless of their orientation in space.

[0077] The common working surface of the utility model can be a plane or a curved surface, can be inclined, or can be horizontal. For the convenience of description, the embodiment of the utility model is placed on a horizontal plane and used on the horizontal plane, and "high and low" and "up and down" are defined in this way.

[0078] A specific embodiment of the utility model discloses a precise skin expansion knife with controllable trauma, such as Figure 1 to Figure 22 As shown, it comprises a support frame 1, a transmission rod 3 and two sets of relatively arranged tool assemblies 2, wherein the support frame 1 is provided with a slideway 101 matched with the two sets of tool assemblies 2, so that the tool assemblies 2 are slidably connected to the support frame 1. The transmission rod 3 partially extends into the slideway and is simultaneously transmission-connected with the two sets of tool assemblies 2, and the transmission rod 3 is configured to at least control the spacing between the blades of the two sets of tool assemblies according to its rotation angle and rotation direction, so as to control the size of the wound formed by the skin expansion knife.

[0079] The support frame 1 is further provided with a first through hole 102 and a passage opening 103 which are communicated with the slideway 101 .

[0080] Two groups of tool assemblies 2 are relatively arranged on the slide 101, so that the tool assembly 2 is slidably connected to the slide 101, that is, the tool assembly 2 is slidably connected to the support frame 1, that is, the tool assembly 2 is slidably connected to the support frame 1 through the slide 101; specifically, the tool assembly 2 includes a slide 21 and a blade 22, the slide 21 is slidably connected to the slide 101, one end of the blade 22 is connected to the slide 21, and the other end of the blade 22 extends from the passage 103, so that the blade 22 can process the target area (the target area refers to any place where skin expansion is required, such as the guide wire left on the skin after puncture, and the target area can also be called the area to be expanded) (the processing includes operations such as puncture and skin expansion).

[0081] The transmission rod 3 is rotatably connected to the support frame 1 through the first through hole 102 , and the transmission rod 3 partially extends into the slideway 101 and is simultaneously transmission-connected to two sets of tool assemblies 2 so as to convert the rotational motion of the transmission rod 3 into the linear motion of the tool assembly 2 .

[0082] It should be noted that the transmission rod 3 rotates around its center line AA.

[0083] The utility model provides a precise skin expander with controllable trauma (hereinafter referred to as the skin expander) which can control the distance between the blades of the two sets of tool assemblies by rotating the transmission rod, thereby controlling the size of the wound formed, and can form a wound size that meets the subsequent operation at the site to be expanded. On the one hand, it avoids the problems of subsequent operation difficulties, looseness, and difficulty in wound healing caused by a wound that is too large; on the other hand, it avoids the problem of requiring a secondary skin expander due to a wound that is too small, increasing the complexity of the operation, and causing secondary injuries.

[0084] Specifically, the transmission rod 3 is configured to be able to control the two groups of tool assemblies 2 to move towards or away from each other by controlling its rotation direction, wherein the transmission rod 3 includes a first rotation direction and a second rotation direction, the first rotation direction is opposite to the second rotation direction, for example, when the first rotation direction is one of counterclockwise rotation and clockwise rotation, the second rotation direction is the other of counterclockwise rotation and clockwise rotation.

[0085] When the transmission rod 3 rotates in the first rotation direction, the two groups of tool assemblies 2 move toward each other, that is, the blades 22 of the two groups of tool assemblies 2 approach each other; when the transmission rod 2 rotates in the second rotation direction, the two groups of tool assemblies move away from each other.

[0086] The displacement of the tool assembly 2 is controlled by controlling the rotation angle of the transmission rod 3, so as to control the distance between the blades of the two sets of tool assemblies 2. That is, the transmission rod 3 is configured to control the displacement of the tool assembly 2 by controlling its rotation angle.

[0087] The skin expansion knife needs to be placed in an initial state before skin expansion. In the initial state, the distance between the blades of the two sets of tool assemblies 2 is zero, that is, at least the tips of the blades of the two sets of tool assemblies 2 are in contact with each other, so that the skin expansion knife can be quickly and smoothly inserted into the area to be expanded.

[0088] According to a preferred embodiment of the utility model, the skin expansion knife also includes a passage for a guide wire to pass through, so that the skin expansion knife of the utility model can be used for skin expansion operations after puncture, that is, the guide wire left after puncture is introduced into the passage, so that the tip of the skin expansion knife is positioned to the place to be expanded (that is, the place where the guide wire is left on the skin after puncture) through the guide wire. The passage is limited by the transmission rod 3 and the two groups of tool assemblies 2. The transmission rod 3 is provided with a first passage 301, and the first passage 301 extends from one end of the transmission rod 3 to the other end. Preferably, the first passage 301 is located on the center line AA of the transmission rod, that is, the first passage 301 extends from one end of the transmission rod 3 to the other end along the center line AA, that is, the center line of the first passage 301 coincides with the center line AA of the transmission rod, so as to avoid the guide wire position from being offset when the transmission rod 3 rotates. A second passage 201 is defined between the two sets of tool assemblies 2 , and the second passage 201 is connected with the first passage 301 to form the passage.

[0089] The passage channel is a linear channel, that is, the first passage channel 301 and the second passage channel 201 are both linear channels, and the first passage channel 301 is located above the second passage channel 201. On the one hand, before the skin expansion knife performs the skin expansion operation, it is positioned to the place to be expanded under the guidance of the guide wire; on the other hand, the skin is expanded with the position of the guide wire as the center, which is convenient for subsequent operations.

[0090] Preferably, the skin expansion knife of the utility model further comprises a guide tube 4, wherein the guide tube 4 is at least partially located in the passage, and the guide wire passes through the guide tube 4, that is, the guide tube 4 is provided with a guide passage for the guide wire to pass through, that is, the guide passage extends from the upper end to the lower end of the guide tube 4. Preferably, the outer end of the guide wire (the end that leaks out of the skin) passes through the upper end of the guide tube 4 (the end away from the knife assembly).

[0091] When using a skin expansion knife, a large force should not be applied to the guide wire to avoid accidental misalignment of the guide wire and affect subsequent operations. The utility model pulls the guide tube 4 outward (in the direction away from the area to be expanded), and the transmission rod 3, the tool assembly 2 and the support frame 1 as a whole are moved toward the area to be expanded with the guide wire under the relative force of the guide tube 4 being pulled outward until the tip of the knife is accurately positioned at the area to be expanded, and then the tool assembly 2 performs a piercing operation under the traction of the guide tube 4 and the guide wire, and then the guide tube 4 is pulled out as a whole, and the skin expansion knife performs subsequent skin expansion operations.

[0092] Such an arrangement not only enables the knife tip to be accurately positioned at the location where the skin is to be expanded, but also the entire process does not require the hands to touch the blade, which can effectively prevent hands from being cut.

[0093] Furthermore, the length of the guide tube 4 is greater than the length of the passage, and the two ends of the guide tube 4 extend from the two ends of the passage respectively, that is, the lower end of the guide tube 4 (the end close to the tool assembly) can extend from the lower end of the second passage, and the upper end of the guide tube 4 can pass through the upper end of the first passage. On the one hand, it is convenient to quickly position the skin expansion knife near the place to be expanded by applying force to the exposed lower end of the guide tube 4, thereby improving the positioning speed of the skin expansion knife; on the other hand, it is convenient to pull the guide tube 4 outward by applying force to the exposed upper end of the guide tube 4, so that the tip of the knife is accurately positioned to the place to be expanded, thereby improving the positioning accuracy, usability and operability of the skin expansion knife.

[0094] It should be noted that, in the present invention, the end of each component close to the part to be expanded during use is defined as the lower end, and the end away from the part to be expanded is defined as the upper end.

[0095] Preferably, the guide tube 4 includes a pipe portion 41 and a wide-mouth portion 42, wherein the pipe portion 41 is at least partially located in the passage, and the pipe portion 41 is provided with the guide passage; the wide-mouth portion 42 is located at the upper end of the pipe portion 41, and the shape of the wide-mouth portion 42 is a gradually expanding type from bottom to top. For example, the wide-mouth portion 42 is conical, trumpet-shaped, or funnel-shaped, and its diameter gradually increases from bottom to top, and the diameter of at least the upper end of the wide-mouth portion 42 is larger than the diameter of the passage, and the inner diameter of the lower end of the wide-mouth portion 42 is equal to the inner diameter of the pipe portion 41, that is, the diameter of the lower end of the wide-mouth portion 42 is equal to the diameter of the guide passage. The wide-mouth portion 42 is provided with a tapered groove that penetrates the guide passage, and the tapered groove is consistent with the shape of the wide-mouth portion 42, that is, it is a gradually expanding type from top to bottom.

[0096] Such a configuration can ensure that the wide mouth portion 42 is always located above the transmission rod 3, so as to facilitate the outward pulling of the guide tube. Preferably, the length of the pipe portion 41 is greater than the length of the passage, that is, the lower end of the pipe portion 41 extends from the lower end of the second passage.

[0097] In this embodiment, the pipeline portion 41 is a cylindrical pipeline, and the travel channel is a cylindrical channel. The diameter of the travel channel is larger than the outer diameter of the pipeline portion 41, and the inner diameter of the pipeline portion 41 is larger than the diameter of the guide wire, so as to ensure that the pipeline portion 41 can pass through the travel channel without obstruction, and the guide wire can pass through the pipeline portion 41 without obstruction.

[0098] According to an embodiment of the present utility model, the transmission rod 3 includes a handle portion 31, a rod portion 32 and a gear portion 33 (the gear teeth of the gear portion are not drawn in the accompanying drawings) connected in sequence. When the transmission rod 3 is rotated, the handle portion 31, the rod portion 32 and the gear portion 33 rotate synchronously, and the transmission rod is preferably rotated by the handle portion 31.

[0099] The gear portion 33 is located in the slideway 101, the handle portion 31 is located outside the slideway 101, one end of the rod portion 32 is connected to the handle portion 31, and the other end of the rod portion 32 passes through the first through hole 102 and is connected to the gear portion 33. That is, the transmission rod 3 includes the handle portion 31, the rod portion 32 and the gear portion 33 connected in sequence from top to bottom, the gear portion 33 extends into the slideway 101 and is transmission-connected to the two sets of tool assemblies, and the rod portion 32 is rotationally connected to the support frame 1 through the first through hole 102. In order to facilitate the assembly of the dermatome, the gear portion 33 and the rod portion 32 are detachably connected.

[0100] The carriage 21 is provided with a rack portion 211 (the teeth pattern of the rack portion that matches the gear portion is not shown in the attached figure) that matches the gear portion 33, and the rack portion 211 is meshed with the gear portion 33. The rotational motion of the transmission rod 3 is converted into the linear motion of the carriage 21 through the matching of the rack portion 211 and the gear portion 33.

[0101] The rack parts 211 of the two sets of tool assemblies 2 are arranged opposite to each other, and the extending direction of the rack parts 211 is consistent with the extending direction of the slideway 101 , that is, consistent with the direction of the linear motion of the tool assembly 2 .

[0102] Preferably, the handle portion 31 and the rod portion 32 are both cylindrical, and the diameter of the handle portion 31 is larger than the diameter of the gear portion 33, and the diameter of the gear portion 33 is larger than the diameter of the gear portion 33, so that it is convenient to control the rotation angle of the gear portion 33 through the handle portion 31, thereby controlling the distance between the blades and the size of the skin expansion. Exemplarily, when the diameter of the gear portion 33 is 4 mm, the skin expansion knife rotates the transmission rod in the second rotation direction for one circle from the initial state, that is, the rotation angle is 360°, then the blade of each set of tool assembly 2 moves 4πmm, and the distance between the blades of the two sets of tool assemblies 2 is 8πmm.

[0103] The first passage 301 extends from the upper end of the handle portion 31 to the lower end of the gear portion 33 , that is, the first passage 301 passes through the handle portion 31 , the rod portion 32 , and the gear portion 33 in sequence.

[0104] The two ends of the slideway 101 are open to ensure that the slide 21 can slide without obstruction. The passage 103 extends from one end of the slideway 101 to the other end, that is, the two ends of the passage 103 are open, and the extension direction of the passage 103 is consistent with the extension direction of the slideway 101, so as to ensure that the blade 22 can slide synchronously with the slide 21 without obstruction.

[0105] The structures of the two sets of tool assemblies 2 are completely the same.

[0106] The slide 21 includes a limiting assembly part 212, a connecting part 213 and a limiting part 214 which are connected in sequence. The limiting assembly part 212 and the limiting part 214 are respectively vertically connected to the two ends of the connecting part 213, and the limiting assembly part 212 and the limiting part 214 are located on the same side of the connecting part 213. The shape of the slide 21 is similar to a "[" shape. The inner side wall of the connecting part 213 (the side facing the other group of tool assemblies, that is, the side opposite to the two groups of tool assemblies is the inner side, and the side opposite to the inner side is the outer side) is provided with the rack part 211, and the rack part 211 extends from one end of the connecting part 213 to the other end to ensure that the slide 21 is always meshed with the gear part 33 to prevent the slide 21 from being separated from the gear part 33.

[0107] Preferably, one end where the limit assembly part 212 and the limit part 214 are connected to the connecting part 213 is flush with the outer wall of the connecting part 213, the heights of the limit assembly part 212, the limit part 214 and the connecting part 213 (the height refers to the length of the component in the direction of the center line AA) are equal, and the upper top walls and lower bottom walls of the three are flush respectively, so as to facilitate the sliding connection between the slide and the slide 101.

[0108] In order to improve the transmission stability of the slide 2 and the gear part 33, the slide also includes an assembly boss 215, the assembly boss 215 extends from the inner side wall of the limit assembly part 212 to the inner side wall of the connecting part 213, and the assembly boss 215 is located directly below the rack part 211, the upper top wall of the assembly boss 215 is flush with the lower bottom wall of the rack part 211, and the upper top wall of the assembly boss 215 is aligned with the limit assembly part 212 and the connecting wall The inner side wall of the assembly limit portion 213 is vertical, and the lower bottom wall of the assembly boss 215 is flush with the lower bottom walls of the limit assembly portion 212, the connection portion 213 and the limit portion 214, that is, the assembly boss 215 is in an "L" shape, with the short side connected to the inner side wall of the assembly limit portion 212, the long side connected to the inner side wall of the connection portion 213, and the short side extends from one end to the other end of the inner side wall of the assembly limit portion 212, and the long side extends from one end to the other end of the inner side wall of the connection portion 213. In this way, the gear portion 33 is always located on the assembly boss 215, which not only supports the gear portion 33, but also ensures the meshing stability of the rack portion 211 and the gear portion 33, so as to improve the operational stability and safety of the dermatome.

[0109] The blade 22 is arranged on the position limiting assembly part 212, that is, the position limiting assembly part 212 is connected to the blade 22. Preferably, the blade 22 is detachably connected to the position limiting assembly part 212. The position limiting assembly part 212 is provided with a slot 212a for detachably assembling the blade 22, and the blade 22 is provided with a clamping part 221 matched with the clamping part 212a. By inserting the clamping part 221 into the slot 212a, the detachable connection between the blade and the slide is achieved.

[0110] In order to improve the connection stability and assembly convenience between the limit assembly part 212 and the blade 22, the slot 212a is located at the position where the limit assembly part 212 is connected to the assembly boss 215, and both ends of the slot 212a are open and extend vertically from the outer side of the limit assembly part 212 to the inner side of the assembly boss 215 (that is, the extension direction of the slot is consistent with the extension direction of the rack part), and the upper wall of the slot 212a is provided with an upwardly recessed semi-cylindrical groove 212b, and the extension direction of the groove 212b is perpendicular to the extension direction of the slot. The upper wall of the clamping portion 221 is provided with a convex column 221a that matches the groove 212b. When the clamping portion 221 is inserted into the clamping groove 212a, the convex column 221a is inserted into the groove 212b. Such a configuration can prevent the blade 22 from sliding in the clamping groove during the skin expansion process, and even prevent the blade 22 from falling off the slide 21 during the skin expansion process, which can not only ensure the stability and safety of the skin expansion process, but also ensure the accuracy of skin expansion during the skin expansion process.

[0111] According to one embodiment of the utility model, the blade 22 includes a clamping portion 221 and a blade body 222, and a connecting block 221b is provided at the bottom of the clamping portion 221. The clamping portion 221 is mounted above the blade body 222 through the connecting block 221b, so that there is a certain space between the bottom end face of the clamping portion 221 and the top end face of the blade body 222, which facilitates the insertion of the clamping portion 221 into the clamping slot, thereby further improving the structural stability of the tool assembly.

[0112] The shape of the blade body 222 is a right-angled trapezoid, the clamping part 221 is arranged on the right-angled waist of the right-angled trapezoid, the upper bottom and the hypotenuse of the blade body 222 are provided with blades, and the lower bottom of the blade body 222, the clamping part 221 and the side wall on the same side of the lower bottom are provided with a passage groove 202 for forming the second passage 201. When the skin expansion knife is in the initial state, the two groups of tool assemblies 2 abut to limit the second passage 201, the lower bottoms of the blade bodies of the two groups of tool assemblies 2 abut against each other, and the side walls of the passage grooves provided in the clamping parts of the two groups of tool assemblies abut against each other, so as to jointly limit the second passage 201. In the initial state, the two blades abut against each other to form a tool similar to the shape of a "pen tip", and the edges of the tool except the upper end are provided with blades, which is not only convenient for piercing from the skin to be expanded, but also convenient for the two blades to be separated for skin expansion.

[0113] In order to improve the skin expanding effect of the skin expanding component, the upper bottom and bevel of the blade body 222 are provided with ultra-thin blades, and the thickness gradually increases from the upper bottom and bevel to the center. Such a setting can not only ensure that the blade is sharp enough, but also ensure that the blade has sufficient cutting stability.

[0114] Preferably, the blade 22 is a disposable blade, that is, the blade of the skin expansion knife needs to be replaced after each skin expansion is completed to ensure the hygiene of each skin expansion.

[0115] In this embodiment, the length of the blade 22 (i.e., the length of the bottom) is 5 mm, so that under the guidance of the guide tube and the guide wire, the blade can penetrate the subcutaneous depth by more than 5 mm. The skin expansion mainly expands the dermis. Generally, people penetrate the dermis to reach the subcutaneous depth by more than 2-3 mm, and few people can reach 5 mm or more. The width of the blade 22 (i.e., the length of the right-angle waist) is 1.5 mm. Of course, in actual situations, a skin expansion knife can be provided with multiple sets of tool assemblies of different sizes to meet different skin expansion requirements.

[0116] When the skin expansion knife is in the initial state, the two sets of knife assemblies 2 are arranged opposite to each other and staggered, such as Fig.13 and Fig.14 As shown, the "[" openings of the two slides 21 are arranged opposite to each other, and the inner walls of the two limiting assembly parts 212 (the side walls opposite to the limiting part 214) are in contact with each other, and the gear part 33 is located between the two limiting assembly parts 212 and on the assembly boss 215, and the two blades 22 are in contact with each other. Such an arrangement, on the one hand, is used to limit the second passage 201, so that the gear part 33 can be meshed with the rack parts 211 of the two tool assemblies 2 at the same time; on the other hand, it makes the structure of the skin reamer more compact and the use effect better.

[0117] When the skin expansion knife is performing a skin expansion operation, the transmission rod 3 is rotated in the second rotation direction, the limit assembly part 212 moves away from the center line AA, and the limit part 214 moves toward the center line AA, so that a distance is generated between the two blades to achieve the skin expansion operation.

[0118] The slide 21 is slidably connected to the slide 101. Exemplarily, the slide 21 is slidably connected to the slide 101 through matching slide grooves and slide rails, that is, the slide 21 is provided with one of the matching slide grooves and slide rails, and the slide 101 is provided with the other of the matching slide grooves and slide rails, and the slide rail or the slide groove extends from one end to the other end of the outer side wall of the slide 21, and the slide groove or the slide rail extends from one end to the other end of the slide 101.

[0119] In this embodiment, a slide groove 104 is provided on opposite sides of the slide 101, and the slide groove 104 extends from one end of the slide 101 to the other end; the outer wall of the slide 21 is provided with a slide bar 216 that cooperates with the slide groove 101, and the slide bar 216 extends from one end of the outer wall of the slide 21 to the other end.

[0120] The extending direction of the slide groove, the slide bar, and the rack portion 211 is consistent with that of the slideway, and the extending direction of the slideway 101 is perpendicular to the direction of the center line AA of the transmission rod 3 .

[0121] According to a preferred embodiment of the present utility model, the support frame 1 includes a connected support platform 11 and a support sleeve 12, the support platform 11 is provided with the slideway 101, the first through hole 102 and the passage 103, the support sleeve 12 is connected to the upper end surface of the support platform 11, and is covered on the first through hole 102, that is, the support sleeve 12 is surrounded by the outside of the first through hole 102. The center line of the support sleeve 12 coincides with the center line AA of the power transmission rod 3.

[0122] Preferably, the support sleeve 12 is a cylindrical sleeve, and the lower end of the support sleeve 12 is vertically connected to the support platform 11 , that is, the support sleeve 12 is perpendicular to the slideway 101 .

[0123] The support sleeve 12 is provided with an assembly channel 105 that cooperates with the rod portion 32 of the transmission rod 3, and the diameter of the assembly channel 105 is larger than the outer diameter of the rod portion 32. The assembly channel 105 is connected to the first through hole 102, that is, the diameter of the first through hole 102 is smaller than the diameter of the assembly channel 105.

[0124] Part of the rod portion 32 is located in the assembly channel 105, and the rod portion 32 can rotate relative to the support sleeve 12. The handle portion 31 of the transmission rod 3 is located above the support sleeve 12, so that the transmission rod 3 can be rotated by the handle portion 31.

[0125] In order to accurately control the rotation angle of the transmission rod 3, the upper end surface of the support sleeve 12 is provided with at least one damping column 121, and the lower end surface of the handle portion 31 is provided with at least one protrusion 311 matching the damping column 121, and the damping column 131 is located on the movement trajectory of the protrusion 311 (the protrusion 311 rotates synchronously with the transmission rod 3), and the distance between the protrusion 311 and the upper end surface of the assembly sleeve 12 is less than the height of the damping column 121, so that the damping column 121 can produce a damping effect on the rotation of the protrusion 311, that is, when the protrusion 311 rotates, the contact with the protrusion 311 is hindered and perceived by the operator, thereby facilitating the precise control of the rotation angle of the transmission rod.

[0126] When there are multiple protrusions 311 , the protrusions 311 are evenly arranged around the outside of the rod portion 32 , and the protrusions 311 are equidistant from the sidewalls of the rod portion 32 , that is, the multiple protrusions 311 are circularly arranged around the outside of the rod portion 32 .

[0127] In order to enhance the prompt effect of damping, the upper end surface of the support sleeve 12 is provided with two damping columns arranged opposite to each other, and the number of the protrusions is an even number, and the number of the protrusions is 4 to 12.

[0128] Preferably, the top end surface of the damping column 121 is a spherical surface. The protrusion is in a hemispherical shape, and the spherical surface is opposite to the damping column 121. While ensuring the damping effect of the damping column, the rotation smoothness of the transmission rod 3 is not affected.

[0129] In this embodiment, the upper end surface of the support sleeve 12 is provided with two damping columns arranged opposite to each other, and the number of the protrusions 311 is twelve.

[0130] It should be noted that when the skin expander is in the initial position, the protrusion 311 is in close contact with one side of the damping column so as to more accurately control the size of the wound.

[0131] Exemplarily, the diameter of the gear portion is d, the width of the blade is a, the number of damping columns is 1, the number of protrusions is 12, and the transmission rod generates one damping from the initial state along the second rotation direction, then the rotation angle is α=30°, at this time the distance between the two blades is s=2×(d×π×1÷12), and the width of the wound is w=2a+s; the transmission rod generates n (n is an integer) dampings from the initial state along the second rotation direction, then the rotation angle is α=n×30°, at this time the distance between the two blades is s=2×(d×π×n÷12), and the width of the wound is w=2a+s.

[0132] Therefore, in practical applications, the required incision size can be determined based on the operating instrument used after skin expansion, and then the required rotation angle of the transmission rod can be calculated based on the size data of the skin expansion knife, and then the skin expansion knife can be used to perform the skin expansion operation to obtain the required size of the incision.

[0133] In order to more accurately control the size of the wound, a dial can be provided on the skin expander, and the dial can directly indicate the rotation angle of the transmission rod, and can also directly indicate the size of the wound through conversion.

[0134] In order to prevent the tool assembly 2 from falling off the slide 101, the two ends of the support platform 11 are detachably provided with limiting elements 13, and the limiting elements 13 are provided with slots 131 for the adjacent tool assembly to slide and baffles 132 for blocking another tool assembly. Such arrangement enables the limiting assembly portion 212 of the slide 21 to always be located in the slide 101. On the one hand, it prevents the tool assembly 2 from falling off the support platform 11, and on the other hand, it further limits the size of the wound to prevent the wound from being too large. At this time, the length of the slide is the maximum wound formed by the dermatome. Exemplarily, the length of the slide 101 is 2 cm, that is, the maximum wound formed by the dermatome is 2 cm, which can be satisfied by most of the existing intracavitary instruments.

[0135] The shape of the notch 131 is matched with at least one end of the slide 21 provided with the limiting portion 214, so as to ensure that the sliding of the slide 21 is not hindered by the limiting element 13. The baffle 132 is projected in the direction of the slideway 101, and can at least partially cover the assembly limiting portion 212 of the tool assembly away from the baffle 132. Preferably, the notch 131 is also provided with an opening intersecting with the passage 103, so as to avoid hindering the movement of the blade.

[0136] In this embodiment, the length of the transmission rod is 5 cm.

[0137] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. A precise skin expansion knife with controllable trauma, characterized in that: It includes a support frame, a transmission rod and two sets of tool assemblies arranged opposite to each other; The support frame is provided with a slideway matched with two sets of tool assemblies, so that the tool assemblies are slidably connected to the support frame; The transmission rod partially extends into the slideway and is simultaneously transmission-connected to the two sets of tool assemblies. The transmission rod is configured to at least control the spacing between the blades of the two sets of tool assemblies according to its rotation angle and rotation direction, so as to control the size of the wound formed by the skin expander.

2. The skin expansion knife according to claim 1, characterized in that: The transmission rod is configured to control the two sets of tool assemblies to move toward each other or away from each other by controlling the rotation direction of the transmission rod, wherein the transmission rod includes a first rotation direction and a second rotation direction, and when the transmission rod rotates in the first rotation direction, the two sets of tool assemblies move toward each other; when the transmission rod rotates in the second rotation direction, the two sets of tool assemblies move away from each other; The displacement of the tool assembly is controlled by controlling the rotation angle of the transmission rod.

3. The skin expansion knife according to claim 2, characterized in that: The skin expansion knife also includes a passage for the guide wire to pass through; The travel channel is limited by the transmission rod and two sets of tool assemblies; The transmission rod is provided with a first passage, and the first passage extends from one end of the transmission rod to the other end; A second travel passage is defined between the two sets of tool assemblies; The second passage is connected with the first passage to form the passage.

4. The skin expansion knife according to claim 3, characterized in that: The skin expansion knife also includes a guide tube, and the guide tube is at least partially located in the passage; The guide tube is provided with a guide channel for the guide wire to pass through.

5. The skin expansion knife according to claim 4, characterized in that: The length of the guide tube is greater than the length of the passage, and two ends of the guide tube extend from two ends of the passage respectively.

6. The skin expansion knife according to claim 4, characterized in that: The guide tube includes a pipe portion and a wide-mouth portion, wherein the pipe portion is at least partially located in the travel channel, and the pipe portion is provided with the guide channel; the wide-mouth portion is located at the upper end of the pipe portion, and the shape of the wide-mouth portion is gradually expanded from bottom to top, and the diameter of at least the upper end of the wide-mouth portion is larger than the diameter of the travel channel, so as to ensure that the wide-mouth portion is always located above the transmission rod.

7. The skin expansion knife according to any one of claims 1 to 6, characterized in that: The support frame includes a connected support platform and a support sleeve; The support platform is provided with the slideway, and a first through hole and a passage communicating with the slideway; The support sleeve is connected to the upper end surface of the support platform and is covered on the first through hole; The supporting sleeve is provided with an assembly channel matched with the transmission rod, and the assembly channel is communicated with the first through hole.

8. The skin expansion knife according to claim 7, characterized in that: The two ends of the support platform are respectively provided with detachable limiting elements; The limiting element is provided with a slot for sliding of an adjacent tool assembly and a baffle for blocking another tool assembly.

9. The skin expansion knife according to claim 7, characterized in that: The transmission rod is rotatably connected to the support frame through the first through hole; The transmission rod comprises a handle portion, a rod portion and a gear portion which are connected in sequence, wherein the gear portion is located inside the slideway; the handle portion is located outside the slideway; one end of the rod portion is connected to the handle portion, and the other end of the rod portion passes through the first through hole and is connected to the gear portion; Part of the rod portion is located in the assembly channel, and the handle portion of the transmission rod is located above the support sleeve; The tool assembly is provided with a rack portion matched with the gear portion, and the rack portion is meshed with the gear portion.

10. The skin expansion knife according to claim 9, characterized in that: The tool assembly includes a slide and a blade. The slide is slidably connected to the slideway. One end of the blade is connected to the slide, and the other end of the blade extends out from the passage so that the blade can process the area to be expanded.

11. The skin expansion knife according to claim 10, characterized in that: The slide frame comprises a limit assembly part, a connecting part and a limit part which are connected in sequence, wherein the limit assembly part and the limit part are respectively connected to two ends of the connecting part, and the limit assembly part and the limit part are located on the same side of the connecting part; The inner side wall of the connecting portion is provided with the rack portion, and the rack portion extends from one end of the connecting portion to the other end of the connecting portion; The position limiting assembly portion is connected to the blade; When the skin expansion knife is in the initial state, the two sets of tool assemblies are arranged oppositely and staggered, the inner walls of the two limiting assembly parts are abutted, the distance between the two blades is zero, and the gear part is located between the two limiting assembly parts.

12. The skin expansion knife according to claim 11, characterized in that: The two ends of the slideway are open to allow the slide to slide without hindrance; The slide is provided with one of a matching slide groove and a slide rail, the slide is provided with the other of a matching slide groove and a slide rail, and the slide rail or the slide groove extends from one end to the other end of the outer side wall of the slide, and the slide groove or the slide rail extends from one end to the other end of the slide.

13. The skin expansion knife according to claim 11, characterized in that: The slide also includes an assembly boss, which extends from the inner side wall of the position-limiting assembly portion to the inner side wall of the connecting portion, and is located directly below the rack portion so that the gear portion is always located on the assembly boss.

14. The skin expansion knife according to claim 13, characterized in that: The position limiting assembly portion is provided with a clamping groove, and the blade is provided with a clamping portion matched with the clamping groove, so that the blade and the slide are detachably connected.

15. The skin expansion knife according to claim 14, characterized in that: The blade comprises a blade body and the clamping portion, a connecting block is provided at the bottom of the clamping portion, and the clamping portion is mounted above the blade body through the connecting block; The shape of the blade body is a right-angled trapezoid, the clamping portion is arranged on the right-angled waist of the right-angled trapezoid, and the upper bottom and the oblique side of the blade body are both provided with cutting edges; The lower bottom of the blade body and the side wall of the clamping portion on the same side as the lower bottom are provided with a passing groove for forming a second passing channel; When the skin expansion knife is in the initial state, the lower bottoms of the blade bodies of the two sets of tool assemblies are in contact with each other, and the side walls of the penetration grooves provided in the clamping parts of the two sets of tool assemblies are in contact with each other, so as to jointly limit the second penetration channel.

16. The skin expansion knife according to claim 13, characterized in that: At least one damping column is provided at the upper end of the support sleeve; The lower end surface of the handle portion is provided with at least one protrusion matched with the damping column, the damping column is located on the motion trajectory of the protrusion, and the distance between the protrusion and the upper end surface of the assembly sleeve is less than the height of the damping column, so that the damping column can produce a damping effect on the rotation of the protrusion, thereby realizing accurate control of the rotation angle of the transmission rod; When there are a plurality of protrusions, the protrusions are evenly arranged around the outer side of the rod portion, and the protrusions are equidistant from the side wall of the rod portion.

17. The skin expansion knife according to claim 16, characterized in that: The upper end surface of the support sleeve is provided with two damping columns arranged opposite to each other, and the number of the protrusions is an even number; The number of the protrusions is 4 to 12.

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