Skin expander for skin transplantation

Abstract

The skin expander for skin transplantation comprises an expansion unit and a pressure reduction unit, the expansion unit comprises an expansion bag connected with an injection pot, multiple circles of longitudinal pressure reduction annular pipes and transverse pressure reduction annular pipes are arranged on the surface of the expansion bag in a crisscross mode, and the longitudinal pressure reduction annular pipes and the transverse pressure reduction annular pipes are mutually independent; the pressure reduction unit comprises a shell, a base, a driving mechanism, a liquid supply mechanism and a control block, a cavity is formed in the shell, the shell is installed on the base in a matched mode, and four communicating holes connected with the inner cavity for use are evenly formed in the position, on the front side of the base, of the shell in the circumferential direction at intervals; the device is unique in structure and ingenious in design, and aims to relieve compression on surrounding tissues in the skin expansion process, promote blood circulation, reduce complications and improve the comfort level and the treatment effect of a patient through the design of the pressure reduction annular pipe for alternate liquid filling expansion.

Description

Technical Field

[0001] The invention belongs to the technical field of skin repair, and in particular relates to a skin expander for skin transplantation. Background Art

[0002] Skin expander is a medical device used in plastic surgery and burns, mainly used to repair large skin defects. The basic principle is to implant an expandable sac under the skin area that needs to be repaired, and gradually inject liquid such as saline into the sac to expand the sac, thereby promoting the slow growth and expansion of the surrounding skin tissue, and finally achieving the purpose of covering the wound surface. The existing skin expander is mainly composed of an expansion capsule 1 and an injection pot. The expansion capsule 1 is usually made of biocompatible materials. After being implanted subcutaneously, liquid is regularly injected into the expansion capsule 1 through the injection pot to gradually expand it. As the expansion capsule 1 expands, the surrounding skin tissue is continuously and gently pulled, gradually stretching and proliferating new skin cells, thereby achieving natural growth and expansion of the skin. However, the existing skin expander has some obvious defects during use: the existing skin expander will exert continuous pressure on the surrounding tissues due to the entire surface of the expansion capsule 1 during the expansion process. This pressure surface will directly compress the surrounding blood vessels, especially the microvessels. These blood vessels are key channels for blood supply and waste removal. When the blood vessels are compressed, the blood flow rate in the blood vessels will slow down or even stop completely, which can easily lead to local blood circulation disorders, causing pain, redness, swelling and even necrosis, and increasing the risk of infection and other complications. Summary of the invention

[0003] In view of the defects and problems of existing skin expanders, the present invention provides a skin expander for skin transplantation. The skin expander has a unique structure and ingenious design. It aims to reduce the pressure on surrounding tissues during skin expansion through the design of a decompression ring tube that is alternately filled with fluid and expanded, thereby promoting blood circulation, reducing complications, and improving patient comfort and treatment effects.

[0004] The solution adopted by the present invention to solve the technical problem is: a skin expander for skin transplantation, including an expansion unit and a pressure reduction unit, the expansion unit includes an expansion bag connected to an injection pot, the surface of the expansion bag is cross-arranged with multiple circles of longitudinal pressure-reducing ring tubes and transverse pressure-reducing ring tubes, and the longitudinal pressure-reducing ring tubes and the transverse pressure-reducing tubes are independent of each other; the pressure reduction unit includes a shell, a base, a driving mechanism, a liquid supply mechanism and a control block, the shell is provided with a cavity and is matched and installed on the base, and four connecting holes connected to the internal cavity are evenly spaced along the circumferential direction on the shell on the front side of the base, and the outer openings of the connecting holes are matched and installed with connecting holes. The left side joint of the shell is connected with each longitudinal pressure reducing ring pipe, and the right side joint of the shell is connected with each transverse pressure reducing ring pipe; the joints at the upper and lower ends of the shell are respectively connected with the discharge end of the liquid supply mechanism and the return end of the liquid supply mechanism; the control block is rotatably sleeved in the shell and is transmission-connected with the driving mechanism, and the outer ring surface of the control block blocks and blocks the inner openings of the four connecting holes on the shell; a primary channel is matched in the control block within the enclosed area of ​​the four connecting holes, and the primary channel includes four connecting holes evenly spaced along the outer ring surface of the control block, the first connecting hole is connected with the second connecting hole, and the third connecting hole is connected with the fourth connecting hole.

[0005] The expansion bag is connected to a connecting tube, and three connecting channels are arranged in the connecting tube. The head end of the first connecting channel is connected to the inside of the expansion bag, and the tail end of the first connecting channel is connected to the injection pot; the head and tail ends of the second connecting channel are respectively connected to each longitudinal decompression ring tube and the left side joint of the shell; the head and tail ends of the third connecting channel are respectively connected to each transverse decompression ring tube and the right side joint of the shell.

[0006] A transverse confluence tube and a longitudinal confluence tube are provided at intervals at the edge of the expansion bag; the second connecting channel inside the connecting tube is connected to each longitudinal decompression ring tube through the longitudinal confluence tube; the third connecting channel is connected to each transverse decompression ring tube and the right side joint of the outer shell through the transverse confluence tube.

[0007] The end of the connecting tube away from the expansion bag is matched with a branch joint, and the branch joint is matched with an expansion tube, a longitudinal connecting tube and a transverse connecting tube. The head and tail ends of the expansion tube are respectively connected to the first connecting channel and the injection pot, the head and tail ends of the longitudinal connecting tube are respectively connected to the second connecting channel and the left side joint of the shell; the head and tail ends of the transverse connecting tube are respectively connected to the third connecting channel and the right side joint of the shell.

[0008] The driving mechanism includes a driving motor, a driving gear and a follower gear. The follower gear is coaxially fixedly mounted on the rear end face of the control block, and a driving groove is matched on the outer shell on one side of the follower gear. The driving motor is fixedly mounted on the outer ring surface of the outer shell on one side of the driving shaft groove. The driving gear is fixedly sleeved on the motor shaft of the driving motor, and the driving gear passes through the driving groove and meshes with the follower gear.

[0009] A motor cover is matched and mounted on the outer shell of the driving motor.

[0010] The liquid supply mechanism includes a liquid storage tank, the top of the liquid storage tank is provided with a liquid return hole, the bottom of the liquid storage tank is provided with a liquid discharge port, and a liquid pump is installed in a matching manner. The joints at the upper and lower ends of the shell are respectively connected to The liquid discharge end of the liquid pump is communicated with the liquid return hole of the liquid storage tank.

[0011] A secondary channel is matched and spaced in the control block on the front side of the primary channel, and a transverse pushing mechanism is matched and provided on the outer shell. The transverse pushing mechanism is connected to the control block, and the block can be controlled to slide axially along the inner wall of the outer shell through the transverse pushing mechanism.

[0012] Beneficial effects of the present invention: The skin expander for skin transplantation provided by the present invention has the following beneficial effects: 1. By setting criss-cross decompression ring tubes on the surface of the expansion bag and using the pressure-reducing unit to alternately inject fluid into these ring tubes, the pressure of the expansion bag on the surrounding tissues can be effectively reduced, which helps to avoid problems such as blood circulation disorders and nerve damage caused by long-term compression and reduce the occurrence of complications.

[0013] 2. The design of the decompression ring tube can provide a certain "breathing" space for the surrounding tissues while the expansion bag expands, which helps to maintain good blood circulation, thereby promoting the healthy growth of skin tissue and accelerating the treatment process.

[0014] 3. Due to the existence of the decompression mechanism, patients may feel more comfortable during treatment, reducing pain or discomfort caused by compression and improving the treatment experience. Through the cooperation of the control block and the drive mechanism, the expansion process of the decompression ring tube can be accurately controlled to ensure that each treatment can achieve the expected effect. This means better operability and more reliable treatment results for doctors.

[0015] 4. This design allows the expansion speed and decompression frequency to be adjusted according to the patient's specific conditions, so it is suitable for skin expansion needs in different parts and degrees, improving the versatility and flexibility of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the expansion unit structure of the present invention.

[0017] Figure 2 It is a schematic diagram of the structure of the voltage reduction unit of the present invention.

[0018] Figure 3 It is a schematic diagram of the shell structure of the present invention.

[0019] Figure 4 It is a schematic diagram of the driving mechanism structure of the present invention.

[0020] Figure 5 It is a schematic diagram of the control block structure of the present invention.

[0021] Figure 6 It is a schematic diagram of the internal structure of the control block of the present invention.

[0022] Figure 7 It is a schematic diagram of the use status of the primary channel of the present invention.

[0023] Figure 8 It is a schematic diagram of the use status of the secondary channel of the present invention.

[0024] Numbers in the figure: 1 is an expansion bag, 11 is a longitudinal pressure relief ring, 12 is a transverse pressure relief ring, 13 is a connecting pipe, 14 is a branch joint, 141 is an expansion tube, 142 is a longitudinal connecting pipe, 143 is a transverse connecting pipe, 15 is a transverse confluence pipe, 16 is a longitudinal confluence pipe, 2 is a shell, 21 is a drive groove, 22 is a liquid inlet joint, 23 is a liquid discharge joint, 25 is a longitudinal joint, 26 is a transverse joint, 27 is a cavity; 3 is a driving mechanism, 31 is a driving motor, 32 is a driving gear, 33 is a follower gear, 4 is a transverse push mechanism, 41 is a screw, 42 is a hand wheel, 43 is a top spring, 5 is a base, 6 is a control block, 61 is a primary channel, 611 is an arc channel, 62 is a secondary channel, 621 is a hole groove, 622 is a hard tube, 623 is a ball channel hole, 624 is a sealing ball, and 625 is a ball cavity. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with the accompanying drawings and embodiments. Example

[0026] In view of the problems raised in the above background technology, this embodiment provides a skin expander for skin transplantation, which has a unique structure and ingenious design. Figure 1-7 As shown, a skin expander for skin transplantation is characterized in that it includes an expansion unit and a decompression unit, the expansion unit includes an expansion bag 1 connected to an injection pot, liquid can be injected into the expansion bag 1 through the injection pot to make it expand, thereby continuously pulling the skin tissue, gradually stretching and proliferating new skin cells, and allowing the skin to grow and expand naturally; the surface of the expansion bag 1 is cross-arranged with multiple circles of longitudinal decompression ring tubes 11 and transverse decompression ring tubes 12, and the longitudinal decompression ring tubes 11 and the transverse decompression tubes are independent of each other; the transverse decompression ring tube 12 and the longitudinal decompression ring are both closed-loop tubes connected at both ends, and the closed-loop tubes are matched and fixedly installed on the outer surface of the expansion bag 1, when liquid is injected into the longitudinal decompression ring tube 11 and the transverse decompression ring tube 12, the longitudinal decompression ring tube 11 and the transverse decompression ring tube 12 will expand, thereby reducing the pressure of the expansion bag 1 on the surrounding tissues.

[0027] The pressure reduction unit includes a shell 2, a base 5, a driving mechanism 3, a liquid supply mechanism, a control block 6 and a controller. The controller is connected to the liquid supply mechanism. A cavity 27 matching the control block 6 is provided in the shell 2. The shell 2 is matched and installed on the base 5. Four connecting holes connected to the internal cavity 27 are evenly spaced in the circumferential direction on the shell 2 on the front side of the base 5. The outer openings of the connecting holes are matched and installed with joints. The upper joint of the shell is a liquid inlet joint 22, the lower joint of the shell is a liquid discharge joint 23, the left joint of the shell is a longitudinal joint 25, and the right joint of the shell is a transverse joint 26. The left joint of the shell 2 is connected to each longitudinal pressure reducing ring pipe 11, and the right joint of the shell 2 is connected to each transverse pressure reducing ring pipe 12. The joints at the upper and lower ends of the shell 2 are respectively connected to the liquid discharge end of the liquid supply mechanism and the liquid return end of the liquid supply mechanism. Specifically: The liquid supply mechanism includes a liquid storage tank, a liquid return hole is provided on the top of the liquid storage tank, a liquid discharge port is provided on the bottom of the liquid storage tank, and a liquid pump is installed to match it. The liquid pump is connected to the controller control, and the joints at the upper and lower ends of the shell 2 are respectively connected to the discharge end of the liquid pump and the liquid return hole of the liquid storage tank.

[0028] like Figure 1 As shown, the expansion bag 1 is connected with a connecting tube 13, and three connecting channels are arranged in the connecting tube 13. The head end of the first connecting channel is connected with the inside of the expansion bag 1, and the tail end of the first connecting channel is connected with the injection pot; the head and tail ends of the second connecting channel are respectively connected with each longitudinal decompression ring tube 11 and the left joint of the shell 2; the head and tail ends of the third connecting channel are respectively connected with each transverse decompression ring tube 12 and the right joint of the shell 2; there are many ways to connect the connecting channels with the decompression ring tubes, for example: the edge of the expansion bag 1 is horizontally spaced with transverse channels The second connecting channel inside the connecting pipe is connected with each longitudinal pressure reducing ring pipe 11 through the longitudinal connecting pipe 16, that is, the intersection of the longitudinal connecting pipe 16 and each longitudinal pressure reducing ring pipe 11 is interconnected, and the first end of the second connecting channel is connected with the longitudinal connecting pipe 16; the third connecting channel is connected with each transverse pressure reducing ring pipe 12 and the right side joint of the outer shell 2 through the transverse connecting pipe 15, that is, the intersection of the transverse connecting pipe 15 and each transverse pressure reducing ring pipe 12 is interconnected, and the first end of the third connecting channel is connected with the longitudinal connecting pipe 16.

[0029] The end of the connecting tube 13 away from the expansion bag 1 is matched with a branch joint 14, and the branch joint 14 is matched with an expansion tube 141, a longitudinal connecting tube 142 and a transverse connecting tube 143. The head and tail ends of the expansion tube 141 are respectively connected to the first connecting channel and the injection pot, and liquid can be injected into the expansion bag 1 through the injection pot to expand it; the head and tail ends of the longitudinal connecting tube 142 are respectively connected to the second connecting channel and the left side joint of the outer shell 2; the head and tail ends of the transverse connecting tube 143 are respectively connected to the third connecting channel and the right side joint of the outer shell 2.

[0030] The control block 6 is rotatably mounted in the housing 2 and is transmission-connected to the driving mechanism 3. The controller can drive the control block 6 to rotate in the housing 2 through the driving mechanism 3, and the outer annular surface of the control block 6 blocks and seals the inner openings of the four communicating holes on the housing 2. The control block 6 can be driven to rotate in the housing 2 through the driving mechanism 3. Specifically: like Figure 3 and Figure 4 As shown, the driving mechanism 3 includes a driving motor 31, a driving gear 32 and a follower gear 33. The follower gear 33 is coaxially fixedly mounted on the rear end face of the control block 6, and a driving groove 21 is matched on the housing 2 on one side of the follower gear 33. The driving motor 31 is fixedly mounted on the outer ring surface of the housing 2 on one side of the driving shaft groove and is connected to the controller control. The driving gear 32 is fixedly sleeved on the motor shaft of the driving motor 31, and the driving gear 32 passes through the driving groove 21 and meshes with the follower gear 33. When the driving motor 31 is working, the follower gear 33 is driven by the driving gear 32 to drive the control block 6 to rotate.

[0031] A primary channel is matched in the control block 6 within the enclosed area of ​​the four connecting holes. The primary channel includes four connecting holes evenly spaced along the outer ring surface of the control block 6. The four connecting holes are divided into a first connecting hole, a second connecting hole, a third connecting hole and a fourth connecting hole in a clockwise direction. The first connecting hole is connected to the second connecting hole, and the third connecting hole is connected to the fourth connecting hole.

[0032] like Figure 6 As shown, two arc-shaped channels 611 are evenly spaced in the circumferential direction in the control block 6, and the two ends of the first arc-shaped channel 611 are respectively connected to the first connecting hole and the second connecting hole, and the two ends of the second arc-shaped channel 611 are respectively connected to the third connecting hole and the fourth connecting hole. When the control block 6 is driven to rotate by the driving mechanism 3, the four connecting holes on the control block 6 will overlap and connect with the inner openings of the four connecting holes on the shell 2 in sequence, so that the connecting holes on the left and right sides of the shell 2 are controlled by the control block 6 to be alternately connected with the connecting holes on the upper and lower sides of the shell 2, that is, the longitudinal decompression ring tube 11 and the transverse decompression ring tube 12 on the surface of the expansion bag 1 are alternately filled with liquid and expanded by the control block 6. Specifically: like Figure 7As shown, when the control block 6 is in the initial position, the horizontal decompression ring tube 12 on the surface of the expansion bag 1 is connected to the discharge end of the liquid pump of the liquid supply mechanism, and the vertical decompression ring tube 11 on the surface of the expansion bag 1 is connected to the return hole of the liquid storage tank of the liquid supply mechanism. In this state, the liquid in the liquid storage tank can be extracted by the liquid pump and discharged into the horizontal decompression ring tube 12 on the surface of the expansion bag 1 to elastically expand it at a constant pressure; when the control block 6 is driven by the driving mechanism 3 to rotate 90° counterclockwise, the horizontal decompression ring tube 12 on the surface of the expansion bag 1 is disconnected from the discharge end of the liquid pump of the liquid supply mechanism, and is changed to be connected to the return hole of the liquid storage tank of the liquid supply mechanism, while the vertical decompression ring tube 11 on the surface of the expansion bag 1 will be connected to the discharge end of the liquid pump of the liquid supply mechanism. At this time, the horizontal decompression ring tube 12 will squeeze the liquid injected inside and discharge it back into the liquid storage tank. In this state, the liquid in the liquid storage tank can be extracted by the liquid pump and discharged into the vertical decompression ring tube on the surface of the expansion bag 1. 11 to make it expand elastically at a constant pressure; when in use, after the expansion capsule 1 is placed into the body, liquid can be injected into the expansion capsule through the injection pot to make it expand, thereby promoting the surrounding skin tissue to grow and expand slowly. In this process, the pressure reduction unit can be controlled by the controller to cyclically and alternately inject liquid into all the longitudinal decompression ring tubes 11 and all the transverse decompression ring tubes 12 on the surface of the expansion capsule 1 to make them expand alternately. When the longitudinal decompression ring tube 11 is injected and expanded, the pressure of the expansion capsule 1 on the tissue between the adjacent longitudinal decompression ring tubes 11 can be reduced. When the transverse decompression ring tube 12 is injected and expanded, the pressure of the expansion capsule 1 on the tissue between the adjacent transverse decompression ring tubes 12 can be reduced. Therefore, a decompression channel is established by alternately filling and expanding the longitudinal decompression ring tube 11 and the transverse decompression ring tube 12, thereby reducing the pressure of the expansion capsule 1 on the surrounding tissues, reducing the degree of pressure on the local tissues, and reducing the risk of blood circulation disorders and other complications. Example

[0033] The difference between Example 2 and Example 1 is that Figure 2 As shown, a motor cover is matched and installed on the outer shell 2 of the driving motor 31. The motor cover can effectively prevent external impurities such as dust, moisture, etc. from entering the interior of the motor, avoiding motor failure due to pollution. At the same time, it can also protect the motor from physical damage, such as accidental collision or scratches, thereby extending the service life of the motor. Example

[0034] The difference between Example 3 and Example 2 is that Figure 4 and Figure 6 As shown, a secondary channel 62 is matched and spaced in the control block 6 on the front side of the primary channel, and a horizontal push mechanism 4 is matched on the housing 2. The horizontal push mechanism 4 is connected to the control block 6. The horizontal push mechanism 4 can control the block 6 to slide axially along the inner wall of the housing 2 to adjust the liquid supply mode of the depressurization unit. When the control block 6 slides axially, it will drive the follower gear 33 to slide axially along the driving gear 32, so that the follower gear 33 and the driving gear remain in meshing state. Specifically: The horizontal pushing mechanism 4 includes a screw rod 41, a hand wheel 42 and a top spring 43. A threaded hole matching the screw rod 41 is axially provided in the middle of the end face of the shell 2 on the front side of the control block 6. The screw rod 41 is matched and sleeved in the threaded hole. The outer end of the screw rod 41 extends out of the shell 2 and is installed with the hand wheel 42. The top spring 43 is matched and installed in the shell 2 on the rear side of the control block 6. The top spring 43 will push the control block 6 forward and contact the inner end of the screw rod 41 in a natural state. When the screw rod 41 is driven to rotate by the hand wheel 42 to control the screw rod 41 to penetrate into the shell 2, the axial movement of the drive block can be controlled.

[0035] Preferably, a contact disk is installed coaxially with one end of the driving block toward the control screw, and the screw 41 contacts the contact disk. When the driving block rotates, the contact disk does not rotate, thereby reducing the friction between the screw and the driving block to prevent the screw from rotating when the driving block rotates.

[0036] Preferably, a top spring seat is coaxially rotatably mounted on one end of the follower gear 33 away from the driving block, and the top spring is matched and mounted in the top spring seat on one end facing the follower gear.

[0037] The secondary channel 62 includes three holes and grooves 621 arranged at intervals along the outer ring surface of the control block 6. The holes and grooves 621 are arranged radially, and the angles between the hole and groove 621 located in the middle and the hole and grooves 621 on the left and right sides are both 90°. When the outer notch of the hole and groove 621 overlaps with the inner orifice of the connecting hole on the shell 2, the hole and groove 621 are connected to the corresponding joint; a spherical ball cavity 625 is matched in the middle of the control block 6, and a sealing ball 624 is matched and placed in the ball cavity. A mounting hole connected to the ball cavity is provided at the bottom of the hole and groove 621 located in the middle, and a hard pipe 622 is matched and installed in the mounting hole The inner end of the hard tube 622 matches and extends into the ball cavity, and the outer end of the hard tube 622 does not protrude from the outer annular surface of the control block 6; the bottoms of the two hole grooves 621 located at the outer edges of both sides are matched with ball channel holes 623 connected to the ball cavity, and the outer hole diameter of the two ball channel holes 623 is smaller than the diameter of the sealing ball 624, and the inner hole size of the ball channel hole 623 matches the size of the sealing ball 624. When the ball channel hole 623 rotates downward with the control block 6, the sealing ball 624 in the ball cavity will roll along the inner wall of the ball cavity into the ball channel hole 623 to block the downward ball channel hole 623.

[0038] like Figure 8As shown, when the control block 6 is in the initial position, the control block 6 is driven to move axially by the horizontal push mechanism 4 so that the secondary channel 62 enters the enclosed area of ​​the four connecting holes on the shell 2, the horizontal pressure relief ring tube 12 and the vertical pressure relief ring tube 11 on the surface of the expansion bag 1 are connected with the discharge end of the liquid pump of the liquid supply mechanism through the ball cavity of the secondary channel 62. During the process of the control block rotating one circle, the horizontal pressure relief ring tube 12 and the vertical pressure relief ring tube 11 will be synchronously filled with liquid for pre-expansion, and then when rotating 90°, the sealing ball will fall into the original left ball channel hole to seal it. At this time, the longitudinal joint is connected with the original right ball groove and the liquid inlet joint through a hard tube. When it is rotated 180°, the sealing ball will roll from the ball channel hole into the ball cavity. At this time, the longitudinal joint and the transverse joint are connected with the drainage joint through two ball channel holes. When it is rotated 270°, the original right ball channel hole is set downward, and the sealing ball will fall into the original right ball channel hole to seal it. At this time, the transverse joint is connected with the left ball groove and the liquid inlet joint through a hard tube, so that when in use, the primary channel and the secondary channel can be switched according to needs to adjust the expansion mode of the horizontal pressure reducing ring and the longitudinal pressure reducing ring.

[0039] The difference between Example 4 and Example 3 is that the ball channel hole 623 is tilted along the rotation direction of the driving block. When the hole groove connected to the ball channel hole 623 is in a horizontal state, the sealing ball originally fallen into the ball channel hole can automatically roll down along the sealing ball into the ball cavity.

[0040] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the appended claims, or the equivalent forms of such scope and boundaries.

Claims

1. A skin expander for skin transplantation, characterized in that: It comprises an expansion unit and a pressure reducing unit. The expansion unit comprises an expansion bag connected to an injection pot. The surface of the expansion bag is cross-arranged with multiple circles of longitudinal pressure reducing ring tubes and transverse pressure reducing ring tubes. The longitudinal pressure reducing ring tubes and transverse pressure reducing tubes are independent of each other. The pressure reducing unit comprises a shell, a base, a driving mechanism, a liquid supply mechanism and a control block. The shell is provided with a cavity and is matched and installed on the base. Four connecting holes connected to the internal cavity are evenly spaced along the circumferential direction on the shell on the front side of the base. The outer openings of the connecting holes are matched and installed with joints. The joints on the left side of the shell are connected to the longitudinal pressure reducing ring tubes. The outer shell is connected, and the right side joint of the outer shell is connected with each horizontal pressure reducing ring pipe; the joints at the upper and lower ends of the outer shell are respectively connected with the discharge end of the liquid supply mechanism and the return end of the liquid supply mechanism; the control block is rotatably mounted in the outer shell and is transmission-connected with the driving mechanism, and the outer ring surface of the control block blocks and blocks the inner openings of the four connecting holes on the outer shell; a primary channel is matched in the control block within the enclosed area of ​​the four connecting holes, and the primary channel includes four connecting holes evenly spaced along the outer ring surface of the control block, the first connecting hole is connected to the second connecting hole, and the third connecting hole is connected to the fourth connecting hole.

2. The skin expander for skin transplantation according to claim 1, characterized in that: The expansion bag is connected to a connecting tube, and three connecting channels are arranged in the connecting tube. The head end of the first connecting channel is connected to the inside of the expansion bag, and the tail end of the first connecting channel is connected to the injection pot; the head and tail ends of the second connecting channel are respectively connected to each longitudinal decompression ring tube and the left side joint of the shell; the head and tail ends of the third connecting channel are respectively connected to each transverse decompression ring tube and the right side joint of the shell.

3. The skin expander for skin transplantation according to claim 2, characterized in that: A transverse confluence tube and a longitudinal confluence tube are provided at intervals at the edge of the expansion bag; the second connecting channel inside the connecting tube is connected to each longitudinal decompression ring tube through the longitudinal confluence tube; the third connecting channel is connected to each transverse decompression ring tube and the right side joint of the outer shell through the transverse confluence tube.

4. The skin expander for skin transplantation according to claim 3, characterized in that: The end of the connecting tube away from the expansion bag is matched with a branch joint, and the branch joint is matched with an expansion tube, a longitudinal connecting tube and a transverse connecting tube. The head and tail ends of the expansion tube are respectively connected to the first connecting channel and the injection pot, the head and tail ends of the longitudinal connecting tube are respectively connected to the second connecting channel and the left side joint of the shell; the head and tail ends of the transverse connecting tube are respectively connected to the third connecting channel and the right side joint of the shell.

5. The skin expander for skin transplantation according to claim 1, characterized in that: The driving mechanism includes a driving motor, a driving gear and a follower gear. The follower gear is coaxially fixedly mounted on the rear end face of the control block, and a driving groove is matched on the outer shell on one side of the follower gear. The driving motor is fixedly mounted on the outer ring surface of the outer shell on one side of the driving shaft groove. The driving gear is fixedly sleeved on the motor shaft of the driving motor, and the driving gear passes through the driving groove and meshes with the follower gear.

6. The skin expander for skin transplantation according to claim 1, characterized in that: A motor cover is matched and mounted on the outer shell of the driving motor.

7. The skin expander for skin transplantation according to claim 1, characterized in that: The liquid supply mechanism includes a liquid storage tank, the top of the liquid storage tank is provided with a liquid return hole, the bottom of the liquid storage tank is provided with a liquid discharge port, and a liquid pump is installed in a matching manner. The joints at the upper and lower ends of the shell are respectively connected to The liquid discharge end of the liquid pump is communicated with the liquid return hole of the liquid storage tank.

8. The skin expander for skin transplantation according to claim 1, characterized in that: A secondary channel is matched and spaced in the control block on the front side of the primary channel, and a transverse pushing mechanism is matched and provided on the outer shell. The transverse pushing mechanism is connected to the control block, and the block can be controlled to slide axially along the inner wall of the outer shell through the transverse pushing mechanism.

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