Fully-embedded self-driven interstitial fluid collection type expander

Abstract

The fully-embedded self-driven interstitial fluid collecting type dilator comprises a dilation bag, an interstitial fluid filtering bag is arranged on the left side of the dilation bag, the interstitial fluid filtering bag is of an oblate sphere structure after being deformed, and the bag wall is a micropore dialysis filter membrane; a liquid inlet in the left end of the expansion bag is communicated with a liquid outlet in the right end of the interstitial fluid filtering bag through a liquid guide pipe, a valve control mechanism is arranged in the middle of the liquid guide pipe, and a negative pressure generating mechanism used for generating negative pressure in the interstitial fluid filtering bag is arranged in the middle of the liquid guide pipe; according to the full-embedded self-driven tissue fluid collection type expander, the built-in semi-permeable negative pressure generation mechanism is used for collecting and filtering tissue fluid, the tissue fluid is controllably pumped into the expansion bag through the valve control mechanism, and the self-expansion extrusion pump or the electric suction pump can be selected as the negative pressure generation mechanism. Safe expansion which does not need external puncture water injection, does not depend on external energy, is controllable in expansion speed and can quickly release pressure in an emergency state is achieved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a fully implantable, self-driven tissue fluid collection expander. Background Technology

[0002] Skin expansion is a common method for repairing skin defects in burn, plastic, and orthopedic surgeries. Traditional skin expanders require regular percutaneous injection of saline solution, which is painful, carries a risk of infection, is inconvenient for patients to travel to and from the hospital, and incurs costs.

[0003] Fluids are a good medium for skin expansion, but they require external injection.

[0004] Existing technologies include automated expansion schemes that use gas as a medium. However, gas is compressible, providing less expansion force than liquids. The mechanical support provided during expansion is difficult to control, and these schemes also suffer from drawbacks such as complex structures, reliance on external energy sources, and the risk of leakage or malfunction. For example, some schemes use chemical reactions to generate gas, external gas cylinders, or electric pumps, which still require external intervention or raise reliability issues related to implanted electronic components.

[0005] Therefore, there is an urgent need for a skin expansion system that can be completely implanted in the body, requires no external injection of liquid, has a simple structure, is safe and reliable, and achieves controlled expansion without pain. To this end, we propose a fully implantable, self-driven tissue fluid collection expander. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the existing defects and provide a fully implantable self-driven tissue fluid collection expander. It collects filtered tissue fluid through a built-in semi-permeable negative pressure generating mechanism and pumps it into the expansion sac in a controllable manner through a valve control mechanism. It achieves safe expansion without external puncture and water injection, without external energy dependence, with controllable expansion speed, and can quickly release pressure in emergency situations. It can effectively solve the problems in the background technology.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a fully implantable self-driven tissue fluid collection expander, comprising an expansion bladder and a negative pressure generating mechanism. The expansion bladder is connected to the negative pressure generating mechanism via a liquid conduit. A valve control mechanism is provided in the middle of the liquid conduit, allowing liquid to flow unidirectionally from the negative pressure generating mechanism to the expansion bladder during operation, and capable of releasing pressure at both ends in an emergency. The negative pressure generating mechanism is a self-expanding squeeze pump, which includes a bladder wall that filters the tissue fluid. The filtered tissue fluid is collected by the self-expanding squeeze pump through the filtering bladder wall and controllably pumped into the expansion bladder via the valve control mechanism, achieving safe expansion without external puncture and water injection, without external energy dependence, with controllable expansion speed, and rapid pressure release in an emergency.

[0008] Furthermore, a tissue fluid filtration capsule is provided on the left side of the expansion capsule. The tissue fluid filtration capsule is deformed into a flattened sphere or a tubular structure, and the capsule wall is a microporous dialysis membrane. The inlet at the left end of the expansion capsule and the outlet at the right end of the tissue fluid filtration capsule are connected by a liquid conduit. The separate tissue fluid filtration capsule is provided to compensate for the insufficient filtration capacity of the capsule wall of the self-expanding squeeze pump.

[0009] Furthermore, the valve control mechanism includes a pipe, a fixed seat, a through hole, and a plugging rod. A pipe is connected in parallel to the middle of the liquid conduit, and a fixed seat is provided in the middle of the pipe. The fixed seat has a through hole inside, and an adjustable plugging rod is provided inside the through hole. In an emergency, the dilation bladder and the tissue fluid filtration bladder can be connected to release pressure.

[0010] Furthermore, the valve control mechanism also includes a threaded groove, a bolt, and a magnet. The top wall of the through hole is provided with a threaded groove, and a bolt is threadedly connected inside the threaded groove. A magnet is provided on the upper surface of the bolt. The upper end of the sealing rod is fixedly connected to the lower end of the bolt, so as to facilitate the magnetic control of the pipeline opening and closing.

[0011] Furthermore, the tissue fluid is filtered through a capsule that deforms into a flattened spherical structure. The self-expanding squeeze pump includes a capsule, a pump body, and a one-way valve. The capsule is fitted onto the outer surface of the liquid conduit, and the pump body is located on the bottom wall of the capsule. The pump body is connected in series in the middle of the liquid conduit. One-way valves are connected in series on both the left and right sides of the liquid conduit. The one-way valves are located on the left and right sides of the capsule, respectively, to facilitate the restriction of unidirectional flow of the tissue fluid.

[0012] Furthermore, the self-expanding extrusion pump also includes a fixed rod, a piston, an elastic body, and a sealing sleeve. The top wall of the bladder is provided with a fixed rod, and the lower end of the fixed rod is provided with a piston. The piston is slidably connected to the inside of the pump body. The inside of the pump body is provided with an elastic body that can generate rebound force. The elastic body is located between the lower surface of the piston and the bottom wall of the pump body. The inside of the bladder is provided with a sealing sleeve, which wraps the outer surface of the piston, the upper surface of the piston, and the outer surface of the fixed rod, so as to facilitate the function of negative pressure suction.

[0013] Furthermore, the tissue fluid is filtered through a bladder and deformed into a tubular structure. The self-expanding squeeze pump can be replaced with an electric suction pump. The electric suction pump includes a protective shell and a micro peristaltic pump. The outer surface of the liquid conduit is fitted with a protective shell, and a micro peristaltic pump is provided in the middle of the liquid conduit. The micro peristaltic pump is located inside the protective shell to facilitate the transport of tissue fluid.

[0014] Furthermore, the electric suction pump also includes a power module, a control board, and a wireless remote control transceiver. The bottom wall of the protective shell is equipped with the power module, the control board, and the wireless remote control transceiver. The input end of the control board is electrically connected to the output end of the power module, and the input end of the micro peristaltic pump is electrically connected to the output end of the control board. The control board and the wireless remote control transceiver are bidirectionally electrically connected, which facilitates wireless control via a remote control.

[0015] A method for using a fully implanted, self-driven tissue fluid collection expander includes the following steps:

[0016] S1 implants the self-driven tissue fluid collection expander subcutaneously;

[0017] The S2 compression-deformed tissue fluid filtration bladder will actively restore its shape, expand the subcutaneous tissue, and collect the filtered tissue fluid;

[0018] If the S3 uses a self-expanding squeeze pump: press the pump body periodically to pump the liquid collected in the tissue fluid filtration bladder into the expansion bladder, while creating negative pressure in the tissue fluid filtration bladder, causing the tissue fluid filtration bladder to compress and deform again.

[0019] If an electric suction pump is used: suction is started by remote control or automatic program, and the tissue fluid in the aspirated tissue fluid filtration capsule is pumped into the expansion capsule. At the same time, negative pressure is created in the tissue fluid filtration capsule, and the tissue fluid filtration capsule is compressed and deformed again.

[0020] S4 adjusts the expansion speed by controlling the pressing frequency or the working cycle of the electric pump;

[0021] After S5 expansion is completed, the self-driven tissue fluid collecting dilator is surgically removed.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: This fully implantable self-driven tissue fluid collection expander has the following advantages:

[0023] Using human tissue fluid as the expansion medium, it eliminates the need for external puncture and water injection, offering two preferred options: mechanical self-expansion and electric intelligent control. It adapts to different implantation depths and clinical needs. The expansion speed can be precisely adjusted by the pressing frequency or electronic control program. There is no external catheter penetrating the skin, reducing the risk of infection. The tissue fluid filtration capsule can filter impurities and reduce inflammatory reactions. It is painless to perform punctures and easy to operate. In particular, the self-expansion squeeze pump solution does not require batteries and is suitable for long-term implantation. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of one embodiment of the present invention;

[0026] Figure 3 This is a cross-sectional schematic diagram of the self-expanding extrusion pump and valve control mechanism in this invention;

[0027] Figure 4 This is an enlarged structural schematic diagram of point A in the present invention;

[0028] Figure 5 This is a schematic diagram of another embodiment of the present invention;

[0029] Figure 6 This is a cross-sectional structural schematic diagram of the electric suction pump in this invention.

[0030] In the diagram: 1. Dilatation capsule, 2. Tissue fluid filtration capsule, 3. Fluid conduit, 4. Valve control mechanism, 41. Pipe, 42. Fixing seat, 43. Through hole, 44. Threaded groove, 45. Bolt, 46. Magnet, 47. Sealing rod, 5. Negative pressure generating mechanism, 6. Self-expanding squeeze pump, 61. Capsule body, 62. Pump body, 63. Fixing rod, 64. Piston, 65. Elastomer, 66. Sealing sleeve, 67. One-way valve, 7. Electric suction pump, 71. Protective shell, 72. Miniature peristaltic pump, 73. Power module, 74. Control board, 75. Wireless remote control transceiver. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Please see Figure 1-5 This embodiment provides a technical solution:

[0033] Example 1

[0034] like Figure 1 , Figure 4 As shown, a fully implantable self-driven tissue fluid collection dilator includes a dilator 1 and a negative pressure generating mechanism 5. The dilator 1 is connected to the negative pressure generating mechanism 5 through a liquid conduit 3. The middle of the liquid conduit 3 is provided with a valve control mechanism 4 that allows liquid to flow unidirectionally from the negative pressure generating mechanism 5 to the dilator 1 in the working state and can be connected at both ends to release pressure in an emergency. The negative pressure generating mechanism 5 is a self-expanding squeeze pump 6, which includes a bladder wall that serves to filter tissue fluid.

[0035] The valve control mechanism 4 includes a pipe 41, a fixed seat 42, a through hole 43, and a plugging rod 47. The pipe 41 is connected in parallel to the middle of the liquid conduit 3. The fixed seat 42 is located in the middle of the pipe 41. The fixed seat 42 has a through hole 43 inside. An adjustable plugging rod 47 is located inside the through hole 43. The valve control mechanism 4 also includes a threaded groove 44, a bolt 45, and a magnet 46. The top wall of the through hole 43 has a threaded groove 44. The bolt 45 is threaded inside the threaded groove 44. A magnet 46 is located on the upper surface of the bolt 45. The upper end of the plugging rod 47 is fixedly connected to the lower end of the bolt 45. Next, in an emergency, an external tool is used to generate a rotating magnetic field (a permanent magnet is installed on an electric drill and placed parallel to the bolt 45 and the magnet 46; when the electric drill is working, it drives the permanent magnet to rotate and generate a rotating magnetic field). Under the action of the rotating magnetic field, the magnet 46 drives the bolt 45 to rotate and unscrew from the threaded groove 44, causing the sealing rod 47 to move upward. The through hole 43 in the fixing seat 42 opens, and the pressure is released through the pipe 41 connecting the expansion bladder 1 and the tissue fluid filtration bladder 2. After the pressure is released, the sealing rod 47 is reset and the through hole 43 is closed by the external tool.

[0036] The self-expanding squeeze pump 6 includes a bladder 61, a pump body 62, and a one-way valve 67. The bladder 61 is fitted onto the outer surface of the liquid conduit 3, and the pump body 62 is located on the bottom wall of the bladder 61. The pump body 62 is connected in series in the middle of the liquid conduit 3. One-way valves 67 are connected in series on both the left and right sides of the liquid conduit 3, respectively. The one-way valves 67 are located on the left and right sides of the bladder 61. The self-expanding squeeze pump 6 also includes a fixing rod 63, a piston 64, an elastic body 65, and a sealing sleeve 66. The fixing rod 63 is located on the top wall of the bladder 61, and the piston 64 is located at the lower end of the fixing rod 63. The piston 64 is slidably connected to the inside of the pump body 62. The pump body 62 has an elastic body 65 that can generate rebound force inside. The elastic body 65 can be a spring, a mesh elastic body, or other structures. In this application, a mesh elastic body is preferred. The elastic body 65 is located between the lower surface of the piston 64 and the bottom wall of the pump body 62. The body 61 has a sealing sleeve 66 inside, which covers the outer surface of the piston 64, the upper surface of the piston 64, and the outer surface of the fixing rod 63. The one-way valve 67 is a duckbill valve, umbrella valve, diaphragm valve, or ball valve. Pressing the bladder 61 deflates it. At this time, the bladder 61 drives the piston 64 to move downward in the pump body 62 through the fixing rod 63, generating negative pressure to pump tissue fluid into the pump body 62 through the liquid conduit 3. At the same time, the elastic body 65 is compressed. After being released, the elastic body 65 drives the piston 64 to move upward under the action of the rebound force, and the liquid in the pump body 62 is introduced into the expansion bladder 1 through the liquid conduit 3. Before implanting the device under the skin, the elastic performance of the elastic body 65 of the device is tested to prevent the aging of the elastic body 65 from affecting normal operation. If the elastic body 65 is aged, it can be directly replaced with another device with a good elastic body 65.

[0037] Example 2: Figure 2-4As shown, compared with Example 1, a tissue fluid filtration capsule 2 was added.

[0038] A fully implantable, self-driven tissue fluid collecting dilator includes a dilator 1 and a negative pressure generating mechanism 5. The dilator 1 is connected to the negative pressure generating mechanism 5 via a liquid conduit 3. The middle of the liquid conduit 3 is provided with a valve control mechanism 4 that allows liquid to flow unidirectionally from the negative pressure generating mechanism 5 to the dilator 1 during operation and can be connected at both ends to release pressure in an emergency. The negative pressure generating mechanism 5 is a self-expanding squeeze pump 6, which includes a bladder wall that filters tissue fluid.

[0039] The left side of the dilation sac 1 is provided with a tissue fluid filtration sac 2. The tissue fluid filtration sac 2 is deformed into a flattened spherical structure. The sac wall of the tissue fluid filtration sac 2 is a microporous dialysis membrane. The inlet at the left end of the dilation sac 1 and the outlet at the right end of the tissue fluid filtration sac 2 are connected by a liquid conduit 3. The pore size of the filter membrane of the tissue fluid filtration sac 2 is 0.1μm-10μm, preferably 1μm, so as to allow tissue fluid to pass through while blocking cells and large protein molecules.

[0040] The valve control mechanism 4 includes a pipe 41, a fixed seat 42, a through hole 43, and a plugging rod 47. The pipe 41 is connected in parallel to the middle of the liquid conduit 3. The fixed seat 42 is located in the middle of the pipe 41. The fixed seat 42 has a through hole 43 inside. An adjustable plugging rod 47 is located inside the through hole 43. The valve control mechanism 4 also includes a threaded groove 44, a bolt 45, and a magnet 46. The top wall of the through hole 43 has a threaded groove 44. The bolt 45 is threaded inside the threaded groove 44. A magnet 46 is located on the upper surface of the bolt 45. The upper end of the plugging rod 47 is fixedly connected to the lower end of the bolt 45. Next, in an emergency, an external tool is used to generate a rotating magnetic field (a permanent magnet is installed on an electric drill and placed parallel to the bolt 45 and the magnet 46; when the electric drill is working, it drives the permanent magnet to rotate and generate a rotating magnetic field). Under the action of the rotating magnetic field, the magnet 46 drives the bolt 45 to rotate and unscrew from the threaded groove 44, causing the sealing rod 47 to move upward. The through hole 43 in the fixing seat 42 opens, and the pressure is released through the pipe 41 connecting the expansion bladder 1 and the tissue fluid filtration bladder 2. After the pressure is released, the sealing rod 47 is reset and the through hole 43 is closed by the external tool.

[0041] The self-expanding squeeze pump 6 includes a capsule 61, a pump body 62, and a one-way valve 67. The capsule 61 is fitted onto the outer surface of the liquid conduit 3. The capsule wall of the capsule 61 is made of a microporous dialysis membrane. The pump body 62 is located on the bottom wall of the capsule 61 and is connected in series in the middle of the liquid conduit 3. One-way valves 67 are connected in series on both the left and right sides of the liquid conduit 3, respectively. The one-way valves 67 are located on the left and right sides of the capsule 61. The self-expanding squeeze pump 6 also includes a fixing rod 63, a piston 64, an elastic body 65, and a sealing sleeve 66. The fixing rod 63 is located on the top wall of the capsule 61, and the piston 64 is located at the lower end of the fixing rod 63. The piston 64 is slidably connected to the inside of the pump body 62. The elastic body 65 is located inside the pump body 62 and is located between the lower surface of the piston 64 and the bottom wall of the pump body 62. The sealing sleeve 66 is located inside the capsule 61 to seal the capsule. The sleeve 66 encloses the outer surface of the piston 64, the upper surface of the piston 64, and the outer surface of the fixing rod 63. The one-way valve 67 is a duckbill valve, umbrella valve, diaphragm valve, or ball valve. Pressing the bladder 61 deflates it. At this time, the bladder 61 drives the piston 64 to move downward in the pump body 62 through the fixing rod 63, generating negative pressure. The tissue fluid filtered through the bladder 2 tubing is pumped into the pump body 62 through the liquid conduit 3. At the same time, the elastic body 65 is compressed. After being released, the elastic body 65 drives the piston 64 to move upward under the action of the rebound force, and the liquid in the pump body 62 is introduced into the expansion bladder 1 through the liquid conduit 3. Before implanting the device subcutaneously, the elastic performance of the elastic body 65 of this device is tested to prevent the aging of the elastic body 65 from affecting normal operation. If the elastic body 65 is aged, it can be directly replaced with another device with a good elastic body 65.

[0042] Example 3: Figure 5-6 As shown, compared with Example 2, the tissue fluid filtration capsule 2 is deformed into a tubular structure, and an electric suction pump 7 is used to replace the self-expanding squeeze pump 6.

[0043] The electric suction pump 7 includes a protective shell 71 and a miniature peristaltic pump 72. The protective shell 71 is fitted over the outer surface of the liquid conduit 3, and the miniature peristaltic pump 72 is located in the middle of the liquid conduit 3, inside the protective shell 71. The electric suction pump 7 also includes a power module 73, a control board 74, and a wireless remote control transceiver 75. The bottom wall of the protective shell 71 is equipped with the power module 73, the control board 74, and the wireless remote control transceiver 75. The input terminal of the control board 74 is electrically connected to the output terminal of the power module 73, and the input terminal of the miniature peristaltic pump 72 is electrically connected to the output terminal of the control board 74. Board 74 is bidirectionally electrically connected to wireless remote transceiver 75. Power module 73 can use button battery or other wirelessly rechargeable power modules. Doctors set the daily aspiration volume and frequency through remote control. The signal emitted by remote control is received by wireless remote transceiver 75 and transmitted to control board 74. Control board 74 transmits the device status to remote control through wireless remote transceiver 75. Doctors can know the status of the device through controller. Under the control of control board 74, the micro peristaltic pump 72 in protective shell 71 works intermittently to draw tissue fluid from tissue fluid filtration sac 2 and pump it into dilation sac 1.

[0044] This invention provides a method for using a fully implanted, self-driven tissue fluid collection expander:

[0045] S1 implants the self-driven tissue fluid collection expander subcutaneously;

[0046] The tissue fluid filtration sac 2, which has been compressed and deformed, will actively restore its shape, expand the subcutaneous tissue, and collect the filtered tissue fluid.

[0047] If S3 uses a self-expanding squeeze pump 6: periodically press the pump body to pump the liquid collected in the tissue fluid filtration capsule 2 into the expansion capsule 1, while creating negative pressure for the tissue fluid filtration capsule 2, causing the tissue fluid filtration capsule 2 to compress and deform again.

[0048] If an electric suction pump 7 is used: suction is started by remote control or automatic program, and the tissue fluid in the tissue fluid filtration capsule 2 is pumped into the expansion capsule 1. At the same time, negative pressure is created for the tissue fluid filtration capsule 2, and the tissue fluid filtration capsule 2 is compressed and deformed again.

[0049] S4 adjusts the expansion speed by controlling the pressing frequency or the working cycle of the electric pump;

[0050] After S5 expansion is completed, the self-driven tissue fluid collecting dilator is surgically removed.

[0051] The working principle of the fully implantable self-driven tissue fluid collection expander provided by this invention is as follows: The device is implanted subcutaneously, and the tissue fluid filtration capsule 2 expands the subcutaneous tissue to collect the filtered tissue fluid (allowing water and inorganic salts in the tissue fluid to permeate in, while filtering out macromolecular substances). If the negative pressure generating mechanism 5 uses a self-expanding squeeze pump 6, the capsule 61 is periodically pressed to deflate it. At this time, the capsule 61 drives the piston 64 to move downward in the pump body 62 through the fixing rod 63, generating negative pressure to pump the tissue fluid after passing through the tissue fluid filtration capsule 2 tubing into the liquid conduit 3. Inside the pump body 62, the spring 65 is compressed. After being released, the spring 65 moves the piston 64 upward under the action of the rebound force, and the liquid in the pump body 62 is introduced into the expansion bladder 1 through the liquid conduit 3. Pressing 3-5 times a day can deliver about 2-3 ml of tissue fluid each time. Due to the presence of the one-way valve 67, the tissue fluid can only be transported from the tissue fluid filtration bladder 2 to the pump body 62 and from the pump body 62 to the expansion bladder 1. Due to the presence of the sealing sleeve 65, the contact parts between the piston 64 and the fixing rod 63 and the inner wall of the pump body 62 are sealed to prevent the tissue fluid from leaking out of the pump body 62.

[0052] If the negative pressure generating mechanism 5 uses an electric suction pump 7, the doctor can set the daily suction volume and frequency via a remote control. The signal emitted by the remote control is received by the wireless remote control transceiver 75 and transmitted to the control board 74. The control board 74 transmits the device status to the remote control via the wireless remote control transceiver 75. The doctor can know the status of the device through the controller. Under the control of the control board 74, the micro peristaltic pump 72 inside the protective shell 71 works intermittently to draw tissue fluid from the tissue fluid filtration bladder 2 and pump it into the dilation bladder 1.

[0053] In case of an emergency, an external tool is used to generate a rotating magnetic field (a permanent magnet is installed on an electric drill and placed parallel to the bolt 45 and the magnet 46; when the electric drill is working, it drives the permanent magnet to rotate and generate a rotating magnetic field). Under the action of the rotating magnetic field, the magnet 46 drives the bolt 45 to rotate and unscrew from the threaded groove 44, causing the sealing rod 47 to move upward. The through hole 43 in the fixing seat 42 opens, and the pressure is released through the pipe 41 connecting the expansion bladder 1 and the tissue fluid filtration bladder 2. After the pressure is released, the sealing rod 47 is reset and the through hole 43 is closed using an external tool. After the entire treatment is completed, the device is surgically removed.

[0054] It is worth noting that the miniature peristaltic pump 72 disclosed in the above embodiments can be an N20 miniature peristaltic pump, and the control board 74 can be an N32G451CCL7 general-purpose MCU. The control board 74 controls the operation of the miniature peristaltic pump 72 and the wireless remote control transceiver 75 using methods commonly used in the prior art.

[0055] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A fully implantable, self-driven tissue fluid collection expander, characterized in that: It includes an expansion sac (1) and a negative pressure generating mechanism (5). The expansion sac (1) is connected to the negative pressure generating mechanism (5) through a liquid conduit (3). The middle part of the liquid conduit (3) is provided with a valve control mechanism (4) that allows liquid to flow unidirectionally from the negative pressure generating mechanism (5) to the expansion sac (1) in the working state and can be connected to release pressure at both ends in an emergency. The negative pressure generating mechanism (5) is a self-expanding squeeze pump (6). The self-expanding squeeze pump (6) includes a sac wall that serves to filter tissue fluid.

2. The fully implantable self-driven tissue fluid collecting expander according to claim 1, characterized in that: The left side of the dilatation sac (1) is provided with a tissue fluid filtration sac (2). After deformation, the tissue fluid filtration sac (2) is a flat sphere or a tubular structure, and the sac wall is a microporous dialysis membrane. The inlet at the left end of the dilatation sac (1) and the outlet at the right end of the tissue fluid filtration sac (2) are connected by a liquid conduit (3).

3. The fully implantable self-driven tissue fluid collection expander according to claim 1, characterized in that: The valve control mechanism (4) includes a pipe (41), a fixed seat (42), a through hole (43) and a plugging rod (47). The liquid conduit (3) is connected in parallel with the pipe (41). The fixed seat (42) is provided in the middle of the pipe (41). The fixed seat (42) has a through hole (43) inside. The through hole (43) has an adjustable plugging rod (47) inside.

4. The fully implantable self-driven tissue fluid collection expander according to claim 3, characterized in that: The valve control mechanism (4) also includes a threaded groove (44), a bolt (45) and a magnet (46). The top wall of the through hole (43) is provided with a threaded groove (44). The threaded groove (44) is connected to the bolt (45) by a thread. The upper surface of the bolt (45) is provided with a magnet (46). The upper end of the sealing rod (47) is fixedly connected to the lower end of the bolt (45).

5. The fully implantable self-driven tissue fluid collecting expander according to claim 2, characterized in that: The tissue fluid filtration capsule (2) is deformed into a flattened spherical structure. The self-expanding squeeze pump (6) includes a capsule (61), a pump body (62), and a one-way valve (67). The outer surface of the liquid conduit (3) is fitted with a capsule (61). The capsule wall of the capsule (61) is made of a microporous dialysis membrane. The bottom wall of the capsule (61) is fitted with a pump body (62). The pump body (62) is connected in series in the middle of the liquid conduit (3). One-way valves (67) are connected in series on both the left and right sides of the liquid conduit (3). The one-way valves (67) are located on the left and right sides of the capsule (61), respectively.

6. The fully implantable self-driven tissue fluid collecting expander according to claim 5, characterized in that: The self-expanding extrusion pump (6) also includes a fixed rod (63), a piston (64), an elastic body (65), and a sealing sleeve (66). The top wall of the bladder (61) is provided with a fixed rod (63), and the lower end of the fixed rod (63) is provided with a piston (64). The piston (64) is slidably connected to the inside of the pump body (62). The inside of the pump body (62) is provided with an elastic body (65), which is located between the lower surface of the piston (64) and the bottom wall of the pump body (62). The inside of the bladder (61) is provided with a sealing sleeve (66), which wraps the outer surface of the piston (64), the upper surface of the piston (64), and the outer surface of the fixed rod (63).

7. The fully implantable self-driven tissue fluid collecting dilator according to claim 2, characterized in that: The tissue fluid filtration capsule (2) is deformed into a tubular structure. The self-expanding squeeze pump (6) can be replaced by an electric suction pump (7). The electric suction pump (7) includes a protective shell (71) and a micro peristaltic pump (72). The outer surface of the liquid conduit (3) is fitted with a protective shell (71). The middle part of the liquid conduit (3) is provided with a micro peristaltic pump (72). The micro peristaltic pump (72) is located inside the protective shell (71).

8. The fully implantable self-driven tissue fluid collection expander according to claim 7, characterized in that: The electric suction pump (7) also includes a power module (73), a control board (74) and a wireless remote control transceiver (75). The bottom wall of the protective shell (71) is provided with the power module (73), the control board (74) and the wireless remote control transceiver (75). The input end of the control board (74) is electrically connected to the output end of the power module (73), the input end of the micro peristaltic pump (72) is electrically connected to the output end of the control board (74), and the control board (74) and the wireless remote control transceiver (75) are bidirectionally electrically connected.

9. A method of using a fully implanted, self-driven tissue fluid collection expander, characterized in that, Includes the following steps: S1 implants the self-driven tissue fluid collection expander subcutaneously; The tissue fluid filtration bladder (2) that has been compressed and deformed by S2 will actively restore its shape, expand the subcutaneous tissue, and collect the filtered tissue fluid. S3 If a self-expanding squeeze pump (6) is used: press the pump body periodically to pump the liquid collected in the tissue fluid filtration bladder (2) into the expansion bladder (1), and at the same time create negative pressure for the tissue fluid filtration bladder (2), and the tissue fluid filtration bladder (2) is compressed and deformed again; If an electric suction pump (7) is used: suction is started by remote control or automatic program, and the tissue fluid in the suction tissue fluid filtration bladder (2) is pumped into the expansion bladder (1), while creating negative pressure for the tissue fluid filtration bladder (2), and the tissue fluid filtration bladder (2) is compressed and deformed again. S4 adjusts the expansion speed by controlling the pressing frequency or the working cycle of the electric pump; After S5 expansion is completed, the self-driven tissue fluid collecting dilator is surgically removed.

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