Tissue retractor and tissue retracting system using the same

Abstract

The present invention relates to a tissue retractor and a tissue retracting system using the tissue retractor. The tissue retractor of the present invention comprises a retractor body, a piston cavity is provided on the retractor body, a piston rod is installed in the piston cavity and a wiring structure is provided on the piston rod, a top pressure part is provided on the retractor body, and a wire channel for connecting the wire is provided between the top pressure part and the wiring structure, and a gas channel is provided on the piston cavity so that when the gas is ventilated or exhausted inside, the gas drives the wire to tighten or relax through the piston rod. When in use, the piston cavity is inflated or deflated through the gas source device, so that the gas drives the wire to move through the piston rod, thereby realizing the tightening or relaxation of the wire, so that automatic retraction is realized through the cooperation of the gas source and the retractor body, and one gas source can drive multiple retractors. At the same time, since the retractor does not need to be provided with a driving motor and other structures, its structure is simple and can meet the requirements of the medical device industry.

Description

Technical Field

[0001] The present invention relates to a tissue retractor and a tissue retracting system using the tissue retractor. Background Art

[0002] After human skin tissue is damaged, it needs to be repaired using certain surgical methods, especially when the skin damage is more serious. The contractility of the skin will cause the edges of the damaged skin to shrink. At this time, since the skin on both sides of the wound are far apart, direct suture cannot be performed. A skin expansion device is needed to expand the skin on both sides first, so that the skin on both sides are closer to each other, and then further operations can be performed.

[0003] There are many kinds of skin retractors in the prior art. For example, a Chinese patent document with authorization announcement number CN209611223U discloses a skin retractor, which includes a retractor body having an installation cavity extending in the up-down direction, a guide movement in the installation cavity equipped with a pressing piece and an elastic piece for providing elastic force to the pressing piece, a limiting structure for preventing the pressing piece from escaping from the installation cavity is provided on the retractor body, the pressing piece has a head extending to the lower part of the installation cavity for pressing and matching with a corresponding steel needle, and the pressing piece has a wire channel connected to the installation cavity for allowing the corresponding wire to pass through. A winding roller that penetrates into the installation cavity and is used to wind the corresponding pull wire is rotatably installed at the upper side of the retractor body. A locking mechanism for locking the winding roller is provided on the retractor body. When in use, two steel needles are inserted into the skin on both sides of the wound, and at the same time, a pulling force is applied to the two steel needles by passing the pull wire around the two steel needles. The free end of the pull wire is wound on the winding roller of the retractor, and the length of the pull wire wrapped around the winding roller is adjusted by rotating the winding roller, thereby adjusting the tension of the pull wire. The volume of the pull wire is very small, which is convenient for overlapping and crossing, avoiding accidental touch by the patient during use, and has high safety. In addition, the use of the pull wire is also convenient for pulling wounds of the opposite sex.

[0004] The above-mentioned skin retractor cooperates with steel wire and steel needle to retract the skin, and adopts the rotation of winding roller to provide retraction force. Manual adjustment is required during use, which is very inconvenient to operate. Therefore, a skin retractor capable of automatic retraction is needed. For the above-mentioned type of skin retractor, a driving motor can be directly provided to realize automatic retraction, but this undoubtedly makes the structure of the retractor complicated, greatly increases the risks of sterility, reliability and other conveniences, and it is difficult to meet the requirements of the medical device industry. Summary of the invention

[0005] The present invention provides a tissue retractor to realize automatic retraction under the premise of meeting the requirements of the medical device industry; at the same time, the present invention also provides a tissue retractor system using the tissue retractor.

[0006] A tissue retractor of the present invention adopts the following technical solution:

[0007] Technical Solution 1: A tissue retractor, comprising a retractor body, a piston chamber being provided on the retractor body, a piston rod being installed in the piston chamber for guiding movement, and a wiring structure for connecting a pull wire being provided on the piston rod, a pressing portion being provided on the retractor body, and a pull wire channel for connecting the pull wire being provided between the pressing portion and the wiring structure, and a gas channel being provided on the piston chamber so that when ventilation or exhaust is conducted into the interior of the retractor, the gas passes through the piston rod to drive the pull wire to tighten or relax.

[0008] Technical Solution 2, based on Technical Solution 1: the piston cavity is an annular chamber structure, and the middle part of the annular chamber structure forms the wire pulling channel.

[0009] Technical Solution 3, based on Technical Solution 2: a terminal block is provided at the outer end of the piston rod, a through hole for passing the pull wire is provided at the middle position of the terminal block, and the wiring structure includes terminal posts arranged on both sides of the through hole.

[0010] Technical solution 4, based on technical solution 2 or 3: the retractor body includes a pressing head and an outer cylinder and an inner cylinder assembled on the pressing head, the pressing part is arranged on the pressing head, the outer cylinder and the inner cylinder are spaced apart and the interval forms the annular chamber structure.

[0011] Technical Solution 5, based on Technical Solution 4: the outer cylinder and the inner cylinder are threadedly assembled on the top pressure head and a sealing structure is provided at the connection position.

[0012] Technical Solution 6, based on Technical Solution 5: the sealing structure is a sealing gasket structure.

[0013] Technical solution 7, based on any one of technical solutions 1-3: the end of the retractor body is provided with an anti-slip structure for preventing the piston rod from slipping out of the piston cavity.

[0014] Technical Solution 8, based on Technical Solution 7: the anti-dropout structure includes an anti-dropout cap mounted on the retractor body, and the anti-dropout cap has an anti-dropout stop portion for cooperating with the piston rod.

[0015] Technical Solution 9, based on Technical Solution 1: the piston chamber is a cylindrical chamber structure, the piston rod has a wiring portion outside the cylindrical chamber structure, and the wiring structure is arranged on the wiring portion.

[0016] Technical solution 10, based on technical solution 9: the wiring structure includes a winding wheel rotatably assembled on the wiring part, and the wiring part is also threadedly assembled with a locking disk for squeezing and locking the winding wheel.

[0017] Technical solution 11, based on technical solution 10: the wiring portion is provided with a support tube extending outward, the winding wheel is rotatably set on the support tube, and the locking disk includes a threaded connection portion threadedly connected to the inner wall of the support tube and an extrusion portion arranged at the outer end of the threaded connection portion for extrusion matching with the winding wheel.

[0018] Technical solution 12, based on technical solution 11: the support tube is threaded or forcibly installed on the wiring part.

[0019] Technical solution 13, based on technical solution 11: a damping pad is provided between the support tube and / or the extrusion part and the winding wheel.

[0020] Technical solution 14, based on any one of technical solutions 9-13: the wiring channel includes a lead hole arranged at the position of the top pressing part, one end of the lead hole is located at the middle position of the top pressing part, and the other end is located at the outer position of the retractor body.

[0021] A tissue pulling system of the present invention adopts the following technical solution:

[0022] Technical solution 1: A tissue traction system, including a tissue retractor and a pull wire, the tissue retractor including a retractor body, a piston chamber being provided on the retractor body, a piston rod being provided in the piston chamber for guiding movement, and a wiring structure for connecting the pull wire being provided on the piston rod, a pressing portion being provided on the retractor body, and a pull wire channel for connecting the pull wire being provided between the pressing portion and the wiring structure, a gas channel being provided on the piston chamber so that when ventilation or exhaust is conducted to the interior thereof, the gas passes through the piston rod to drive the pull wire to be tightened or relaxed, and the piston chamber of the tissue retractor is connected to a gas source device through the gas channel.

[0023] Technical Solution 2, based on Technical Solution 1: the piston cavity is an annular chamber structure, and the middle part of the annular chamber structure forms the wire pulling channel.

[0024] Technical Solution 3, based on Technical Solution 2: a terminal block is provided at the outer end of the piston rod, a through hole for passing the pull wire is provided at the middle position of the terminal block, and the wiring structure includes terminal posts arranged on both sides of the through hole.

[0025] Technical solution 4, based on technical solution 2 or 3: the retractor body includes a pressing head and an outer cylinder and an inner cylinder assembled on the pressing head, the pressing part is arranged on the pressing head, the outer cylinder and the inner cylinder are spaced apart and the interval forms the annular chamber structure.

[0026] Technical Solution 5, based on Technical Solution 4: the outer cylinder and the inner cylinder are threadedly assembled on the top pressure head and a sealing structure is provided at the connection position.

[0027] Technical Solution 6, based on Technical Solution 5: the sealing structure is a sealing gasket structure.

[0028] Technical solution 7, based on any one of technical solutions 1-3: the end of the retractor body is provided with an anti-slip structure for preventing the piston rod from slipping out of the piston cavity.

[0029] Technical Solution 8, based on Technical Solution 7: the anti-dropout structure includes an anti-dropout cap mounted on the retractor body, and the anti-dropout cap has an anti-dropout stop portion for cooperating with the piston rod stop.

[0030] Technical Solution 9, based on Technical Solution 1: the piston chamber is a cylindrical chamber structure, the piston rod has a wiring portion outside the cylindrical chamber structure, and the wiring structure is arranged on the wiring portion.

[0031] Technical solution 10, based on technical solution 9: the wiring structure includes a winding wheel rotatably assembled on the wiring part, and the wiring part is also threadedly assembled with a locking disk for squeezing and locking the winding wheel.

[0032] Technical solution 11, based on technical solution 10: the wiring portion is provided with a support tube extending outward, the winding wheel is rotatably set on the support tube, and the locking disk includes a threaded connection portion threadedly connected to the inner wall of the support tube and an extrusion portion arranged at the outer end of the threaded connection portion for extrusion matching with the winding wheel.

[0033] Technical solution 12, based on technical solution 11: the support tube is threaded or forcibly installed on the wiring part.

[0034] Technical solution 13, based on technical solution 11: a damping pad is provided between the support tube and / or the extrusion part and the winding wheel.

[0035] Technical solution 14, based on any one of technical solutions 9-13: the wiring channel includes a lead hole arranged at the position of the top pressing part, one end of the lead hole is located at the middle position of the top pressing part, and the other end is located at the outer position of the retractor body.

[0036] The beneficial effects of the present invention are as follows: the tissue retractor of the present invention comprises a retractor body, a piston chamber is provided on the retractor body, a piston rod is installed in the piston chamber for guiding movement, and a wiring structure for connecting a pull wire is provided on the piston rod, a pressing portion for pressing and cooperating with a corresponding steel needle is provided on the retractor body, and a pull wire channel for connecting the pull wire is provided between the pressing portion and the wiring structure, a gas channel is provided on the piston chamber so that when ventilation or exhaust is performed inside the piston chamber, the gas drives the pull wire to be tightened or relaxed through the piston rod, and when in use, the piston chamber is inflated or deflated through the gas source device, so that the gas drives the pull wire to move through the piston rod, thereby realizing the tightening or relaxation of the pull wire, and thus automatic pulling is realized through the cooperation of the gas source and the retractor body, and one gas source can drive multiple retractors. At the same time, since the retractor does not need to be provided with a driving motor and other structures, its structure is simple and can meet the requirements of the medical device industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0038] Figure 1 It is a structural schematic diagram of a tissue retractor in Embodiment 1 of the tissue retracting system of the present invention;

[0039] Figure 2 It is a structural schematic diagram of a tissue retractor in Embodiment 2 of the tissue retracting system of the present invention;

[0040] Figure 3 for Figure 2 A partial enlarged view of the middle A;

[0041] Figure 4 for Figure 2 A partial enlarged view of point B in the middle;

[0042] Figure 5 It is a structural schematic diagram of a tissue retractor of Example 3 of the tissue retracting system of the present invention;

[0043] Figure 1 Corresponding to Example 1, in the figure: 1, top pressure head; 2, outer cylinder; 3, inner cylinder; 4, piston; 5, piston rod; 6, anti-drop cap; 7, terminal block; 11, wire pulling channel; 12, knotting channel; 21, sealing gasket; 22, gas channel; 23, piston chamber; 41, sealing ring; 51, piston rod connecting part; 71, ring platform; 72, winding column; 73, perforation;

[0044] Figure 2-Figure 4 Corresponding to Example 2, in the figure: 1, top pressure head; 2, cylinder; 3, piston; 4, piston rod; 5, wiring part; 6, wiring structure; 7, wire pulling; 11, mounting groove; 12, wire pulling channel; 21, gas channel; 61, support cylinder; 62, winding wheel; 63, locking disk; 611, stopper; 621, damping pad; 622, winding column; 631, threaded connection part; 13, lead hole; 14, avoidance groove;

[0045] Figure 5 Corresponding to Example 3, in the figure: 5, wiring portion; 51, winding post. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] Embodiment 1 of the tissue pulling system of the present invention, as Figure 1 As shown, the tissue pulling system includes a tissue retractor and a pull line. The tissue retractor includes a retractor body, a piston chamber 23 is provided on the retractor body, a piston rod 5 is provided in the piston chamber 23 for guiding and moving, and a wiring structure for connecting the pull line is provided on the piston rod 5, a pressing portion for pressing with a corresponding steel needle is provided on the retractor body, and a pull line channel 11 for connecting the pull line is provided between the pressing portion and the wiring structure, and a gas channel 22 is provided on the piston chamber 23 so that when the gas is ventilated or exhausted inside, the gas passes through the piston rod 5 to drive the pull line to tighten or relax, and the piston chamber 23 of the tissue retractor is connected to the gas source device through the gas channel 22. In this embodiment, the piston 4 is arranged at the end of the piston rod 5, and the lower end of the piston rod 5 is provided with a piston rod connecting portion 51, and the piston rod connecting portion 51 is connected to the piston 4 through a threaded structure, so as to achieve assembly connection. The inner and outer peripheral surfaces of the piston 4 are provided with sealing rings 41, and there are multiple sealing rings 41, so as to achieve reliable sealing.

[0048] In this embodiment, the piston cavity 23 is set as an annular chamber structure, and a wire pulling channel is formed in the middle of the annular chamber structure, so that the wire pulling is located in the middle position of the retractor, thereby ensuring uniform pulling force when applying pulling force and avoiding deviation.

[0049] In this embodiment, the outer end of the piston rod 5 is provided with a terminal block 7, and a through hole 73 for the wire to pass through is provided at the middle position of the terminal block 7. The wiring structure includes terminal posts provided on both sides of the through hole 73. During use, the wire passes upward from the wire channel 12 through the through hole 73 and then winds around the winding post 72. At the same time, there are two winding posts 72, which is convenient for winding. Specifically, the piston rod 5 is a cylindrical structure, the terminal block 7 is a circular plate-like structure, and the lower end surface is provided with a ring platform 71, which is inserted into the inner cavity of the piston rod 5 through the ring platform 71, and can be specifically connected by thread or interference fit.

[0050] In order to facilitate the processing of the annular chamber structure, in this embodiment, the retractor body includes a top pressure head 1 and an outer cylinder 2 and an inner cylinder assembled on the top pressure head 1. The top pressure part is arranged on the top pressure head 1, and the outer cylinder 2 and the inner cylinder are arranged at intervals and the interval forms an annular chamber structure, that is, the retractor body is arranged as a separate structure, so that the top pressure head 1, the outer cylinder 2 and the inner cylinder can be processed separately, and then assembled together, so as to avoid processing the annular cavity in the retractor body and reduce the processing difficulty. A knotting channel 12 is provided at the lower end of the top pressure head, which crosses the wire pulling channel 12, and its function is the same as the channel function at this position in CN209611223U, which will not be repeated.

[0051] Specifically, the outer cylinder 2 and the inner cylinder are threadedly assembled on the top pressure head 1 and a sealing structure is provided at the connection position. The threaded connection structure is simple and easy to process. At the same time, the sealing structure is a sealing gasket structure. The sealing gasket 21 is specifically arranged at the position where the ends of the outer cylinder 2 and the inner cylinder contact the top pressure head 1, so that the sealing is reliable.

[0052] In order to prevent the piston rod 5 from falling out of the piston cavity, in the present embodiment, an anti-falling structure is provided at the end of the puller body for preventing the piston rod 5 from falling out of the piston cavity; specifically, the anti-falling structure includes an anti-falling cap 6 assembled on the puller body, the anti-falling cap 6 has an anti-falling stop portion for cooperating with the piston rod stop, and the anti-falling cap 6 is threadedly mounted on the outer cylinder body with a threaded structure, which is convenient for processing and manufacturing.

[0053] For this embodiment, the following structural replacement forms may also be possible, including: the piston rod and the terminal block are integrally arranged; a plurality of through holes are arranged on the terminal block for wire pulling and knotting; the top pressure head, the outer cylinder and the inner cylinder are integrally arranged, or the top pressure head and one of them are integrally arranged; the inner and outer cylinders and the top pressure head are force-fitted together or connected by bonding or welding; the sealing structure adopts sealant; the anti-detachment cap is bonded or integrally arranged on the outer cylinder; the anti-detachment structure is directly set as a stop pin.

[0054] Embodiment 2 of the tissue pulling system of the present invention, as Figure 2-Figure 4As shown, in this embodiment, the piston cavity is a cylindrical chamber structure, and the puller body is a cylinder 2, which can be arranged on the top pressure head 1 through a threaded structure or a forced structure. The mounting groove 11 on the top pressure head 1 is used to install the cylinder 2, and the piston rod 4 has a wiring portion 5 outside the cylindrical chamber structure, and the wiring structure 6 is arranged on the wiring portion 5. In this way, the processing of the annular cavity structure can be avoided, and the processing difficulty can be reduced. In this embodiment, the piston rod 4 is connected to the wiring portion 5 and is in a double sleeve shape as a whole. It can be an integral structure or a split structure. At the same time, the wiring structure 6 is symmetrically arranged, which ensures that the piston 3 is evenly stressed, thereby preventing the piston 3 from being deflected and excessively worn and stuck. The piston 3 in this embodiment adopts a rubber structure as a whole, which is connected to the end of the piston rod 4. The gas channel 21 is arranged at the lower position of the cylinder 2.

[0055] The wiring structure 6 is as follows: Figure 3 As shown, it includes a winding wheel 62 rotatably assembled on the wiring part 5, and a locking disk 63 for squeezing and locking the winding wheel 62 is also threadedly assembled on the wiring part 5. The winding wheel 62 is used to wind the pull wire 7. In order to facilitate the winding of the pull wire 7, a winding post 622 is provided on the winding wheel 62, and the pull wire 7 can be wound on the winding post 622 when in use. The purpose of setting the winding wheel 62 is to consider that the stroke of the piston 3 is small. If one stroke is not enough, the locking disk 63 can be loosened, and then the winding wheel 62 can be rotated to tighten the wire, and the piston 3 can be moved downward at the same time, so that the stroke can be infinitely extended, avoiding repeated loosening of the pull wire when moving the piston 3.

[0056] In order to facilitate the arrangement of the winding wheel 62, in this embodiment, a supporting cylinder 61 extending outward is provided on the wiring portion 5, and the winding wheel 62 is rotatably arranged on the supporting cylinder 61. At the same time, the locking disk 63 includes a threaded connection portion 631 threadedly connected to the inner wall of the supporting cylinder 61 and an extrusion portion arranged at the outer end of the threaded connection portion 631 for extrusion-matching with the winding wheel 62. In this embodiment, the extrusion portion is the inner side surface of the locking disk 63. When in use, tightening the locking disk 63 can apply an extrusion force to the winding roller, thereby preventing the winding wheel 62 from loosening.

[0057] In this embodiment, in order to facilitate processing, the support tube 61 and the wiring part 5 are set as separate structures, and the support tube 61 is threaded or forcefully mounted on the wiring part. In this way, the two can be processed separately and then assembled, which reduces the processing cost.

[0058] Furthermore, a damping pad 621 is provided between the support tube 61 and the winding wheel 62 and between the extrusion part and the winding wheel 62. In this way, when the locking disk 63 is loosened, the winding wheel 62 will not loosen instantly, which can prevent the wire from retreating and increase the friction force. The damping pad 621 can be a rubber pad. A stopper 611 is also provided on the support tube, which is used for the winding wheel to cooperate with the extrusion.

[0059] The wiring channel includes a lead hole 13 arranged at the top pressing part, one end of the lead hole 13 is located at the middle position of the top pressing part, and the other end is located at the outer position of the retractor body. The purpose of the lead hole 13 is mainly to pass the pull wire to prevent the pull wire from coming off the tractor body, thereby ensuring that the retractor can be pressed against the steel needle during pulling. At the same time, an avoidance groove 14 is provided on the top pressing head 1, which can avoid the pull wire and avoid squeezing the pull wire, thereby preventing the pull wire from being damaged.

[0060] For this embodiment, the structure may also have the following replacement forms, including: the support tube can also be directly set on the cylinder body; the locking plate can also cooperate with the outer peripheral surface of the support tube, in which case it is equivalent to a screw sleeve structure; the support tube can also be glued to the cylinder body.

[0061] Embodiment 3 of the tissue pulling system of the present invention, as Figure 5 As shown, in this embodiment, the wiring structure is a winding post arranged on the wiring part. When in use, the pull wire can be directly wound around the wiring post. The wiring post can be threadedly assembled on the cylinder body or forcefully mounted on the cylinder body.

[0062] The beneficial effects of the present invention are as follows: when the tissue retractor of the present invention includes a retractor body, the piston cavity is inflated or deflated through the gas source device, so that the gas drives the pull wire to move through the piston rod, thereby achieving the tightening or loosening of the pull wire. In this way, automatic traction is achieved through the cooperation of the gas source and the retractor body, and one gas source can drive multiple retractors. At the same time, since the retractor does not need to be provided with a drive motor and other structures, its structure is simple and can meet the requirements of the medical device industry. Since it is driven by gas and the gas has compressible properties, the retractor has an elastic buffering effect when pulling. The pulling force of the retractor is achieved by a pressure control device set on the piston cavity, that is, it is achieved by a pneumatic automatic control system. The control system is a prior art and will not be described in detail here.

[0063] When the retractor of the present invention is used, it can be used in conjunction with a steel needle. In this case, the steel needle is inserted into the skin on both sides of the wound, and the pull wire is passed around the two steel needles and the excess part of the pull wire is connected to the skin retractor. In addition, the steel needle can be used without using it. In this case, the pull wire is directly passed around the skin at the edge of the wound, and at the same time, the excess parts of the two ends of the pull wire are wrapped around the retractor, so that the wound can be pulled directly by a pull wire.

[0064] In other embodiments, the piston may also be made entirely of metal material, and the sealing performance may be ensured by the matching accuracy between the piston and the cylinder, so that the material is single and it is easier to meet the needs of the medical device industry.

[0065] The tissues described in the present invention are human tissues, specifically including skin, blood vessels, nerves, tendons, muscles, joint capsules, ligaments, bones, etc., that is, the tissue pulling system and tissue pulling device of the present invention can pull all of the above tissues.

[0066] The structure of the tissue retractor in the embodiment of the present invention is the same as that of the tissue retractor in the embodiment of the tissue retractor system, and will not be described in detail.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A tissue retractor, comprising a retractor body, characterized in that: The puller body is provided with a piston chamber, in which a piston rod is installed for guiding movement, and the piston rod is provided with a wiring structure for connecting a pull wire, the puller body is provided with a pressing portion, and a pull wire channel for connecting the pull wire is provided between the pressing portion and the wiring structure, and a gas channel is provided on the piston chamber so that when the gas is ventilated or exhausted to the inside, the gas drives the pull wire to tighten or relax through the piston rod, the piston chamber is an annular chamber structure, and the middle part of the annular chamber structure forms the pull wire channel, the outer end of the piston rod is provided with a wiring board, and the middle position of the wiring board is provided with a through hole for the pull wire to pass through, and the wiring structure includes wiring posts arranged on both sides of the through hole, the puller body includes a pressing head and an outer cylinder and an inner cylinder mounted on the pressing head, the pressing portion is arranged on the pressing head, the outer cylinder and the inner cylinder are arranged at an interval and the interval forms the annular chamber structure, and the end of the puller body is provided with an anti-slip structure for preventing the piston rod from slipping out of the piston chamber.

2. The tissue retractor according to claim 1, characterized in that: The outer cylinder and the inner cylinder are threadedly assembled on the top pressure head, and a sealing structure is provided at the connection position.

3. The tissue retractor according to claim 2, characterized in that: The sealing structure is a sealing gasket structure.

4. The tissue retractor according to claim 1, characterized in that: The anti-dropout structure comprises an anti-dropout cap mounted on the retractor body, and the anti-dropout cap has an anti-dropout stopper for cooperating with the piston rod.

5. A tissue retracting system, comprising a tissue retractor and a pull wire, wherein the tissue retractor is the tissue retractor as described in any one of claims 1 to 4, and the piston chamber of the tissue retractor is connected to a gas source device through a gas channel.

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