A renal hemoperfusion device for renal ischemia

Abstract

This invention discloses a renal hemoperfusion device for use before renal ischemia, relating to the field of perfusion devices. It includes a housing with a pair of fasteners on its side for securing a syringe to each; a movable plate, mounted within the housing via a moving mechanism that drives the movable plate to move within the housing; and a pair of pushers, both mounted on the movable plate, for pushing the piston handle in the syringe. Each pusher includes a sliding sleeve, a moving sleeve, and an elastic member. The sliding sleeve is located on the side of the movable plate, and the moving sleeve is slidably inserted into the sliding sleeve. The advantages of this invention are: strict separation of the two stages avoids human timing errors during operation, ensuring perfusion only after blood vessel closure; the mechanical interlocking mechanism between the baffle and the travel strip forces perfusion to begin only after the fluid-filled bladder has fully expanded, eliminating the risk of misoperation at the hardware level; seamless switching between the injection expansion and perfusion stages ensures high efficiency; and the mechanically pushed perfusion speed during perfusion is more uniform, resulting in better efficacy.

Description

Technical Field

[0001] This invention belongs to the field of medical devices and relates to perfusion technology, specifically to a renal blood perfusion device for renal ischemia. Background Technology

[0002] Partial nephrectomy is often necessary when treating kidney injuries (open or closed) or space-occupying lesions. Prior to this surgery, a renal artery balloon catheter is usually inserted. During the procedure, cryo-fluid is infused through this catheter, essentially performing renal blood perfusion before renal ischemia. Experience shows that laparoscopic or robotic partial nephrectomy assisted by cryo-fluid perfusion effectively reduces intraoperative and postoperative complications, prolongs renal ischemia time, and helps protect renal function.

[0003] In the field of pre-ischemic renal management, traditional methods for achieving local protective perfusion of the kidney typically employ a step-by-step manual injection technique. The specific steps include: first, inserting a balloon catheter into the blood vessel using a syringe, and manually injecting saline to inflate the balloon, thereby sealing the proximal and distal vessels of the renal artery and inferior vena cava to establish an isolation zone; second, the operator needs to switch to another syringe and continuously inject saline to maintain local perfusion. Existing techniques mostly rely on a combination of ordinary blood perfusion devices or manual syringes to complete the above process. The core of this method depends on manually controlling the injection sequence and force to achieve step-by-step balloon inflation and subsequent perfusion. However, this traditional method requires the operator to manually switch syringes during the procedure, which can easily lead to unstable balloon pressure or delayed perfusion, and occasionally, human error such as reversing the step-by-step sequence can occur, causing medical accidents. Summary of the Invention

[0004] To address the problems mentioned in the background art, this invention provides a renal hemoperfusion device for renal ischemia. Through strict two-stage separation, it avoids human timing errors during operation and ensures that perfusion is initiated only after the blood vessels are closed. The mechanical interlocking mechanism between the baffle and the travel bar forces the perfusion to start only after the fluid bladder has fully expanded, thus eliminating the risk of misoperation at the hardware level.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a renal hemoperfusion device for renal ischemia, comprising a housing, fasteners, a movable plate, a moving mechanism, and pushers. A pair of fasteners are spaced apart on one side of the housing, each fastener used to fix a syringe. The movable plate is mounted on the housing via the moving mechanism, and the moving mechanism can drive the movable plate to move closer to or further away from the syringes on the housing. A pair of pushers are provided on the movable plate for pushing the piston handles of the two syringes. Each pusher includes a sliding sleeve, a moving sleeve, and an elastic member. The sliding sleeve is disposed on the side of the movable plate, and the movable sleeve is slidably inserted into the sliding sleeve. An elastic member is disposed between the interior of the sliding sleeve and the movable sleeve. A retaining pad is fixedly disposed on the side of the movable sleeve, and the retaining pad extends radially outward from a sliding groove axially opened on the side wall of the sliding sleeve. A pair of travel strips corresponding to the two retaining pads are also disposed on the housing. When the retaining pad abuts against the travel strips, the corresponding movable sleeve stops moving in the direction of the syringe. An adjustable-length push rod is disposed at one end of the movable sleeve near the retaining pad, and the push rod is used to push the piston handle in the syringe.

[0006] Based on the above technical solution, the present invention can be further improved as follows.

[0007] Furthermore, the travel bar is mounted on the housing via a drive component, and the distance between the travel bar and the fastener is adjustable.

[0008] Furthermore, the driving component includes two left and right hinge supports disposed inside the housing, an adjusting screw rotatably connected to the two hinge supports, and a moving block helically connected to the adjusting screw. The housing is provided with a guide groove, and the travel bar passes through the guide groove and is fixedly connected to the moving block.

[0009] Furthermore, the sliding sleeve is slidably mounted on the movable plate via a dovetail strip.

[0010] Furthermore, the movable plate is also provided with an adjusting component, which is used to adjust the position of the two pushing components on the movable plate.

[0011] Furthermore, the adjusting member includes a driving member, a driven gear, and a pair of racks. The driven gear is rotatably mounted on the movable plate. The two racks are arranged in parallel and spaced apart and are respectively fixedly connected to the corresponding sliding sleeves. The two racks mesh with the driven gear. The driving member is mounted on the movable plate and is used to drive the driven gear to rotate.

[0012] Furthermore, the driving component includes a rack plate, an electric actuator, and a drive gear. The rack plate is slidably disposed on the back of the movable plate, the electric actuator is fixedly disposed on the back of the movable plate, and the telescopic end of the electric actuator is fixedly connected to one end of the rack plate. The rack plate meshes with the drive gear rotatably disposed on the back of the movable plate. The drive gear is coaxially connected to a synchronous pulley located on the front of the movable plate. The synchronous pulley is connected to a transmission wheel coaxially connected to the driven gear via a synchronous belt.

[0013] Furthermore, the moving mechanism includes a slide bar, a moving plate, a lead screw, and a motor. There are two slide bars arranged parallel to each other within the housing. The moving plate is slidably arranged between the two slide bars. The lead screw is rotatably arranged within the housing. The moving plate is helically connected to the lead screw. The motor is located on one side of the housing and is used to drive the lead screw to rotate. The moving plate is fixedly arranged on the moving plate.

[0014] Furthermore, the elastic member is a spring or a spring-type telescopic rod.

[0015] Furthermore, a control console is provided on the casing.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] This invention provides a renal hemoperfusion device for use before renal ischemia. Its first pusher (push rod) preferentially pushes the bladder to expand the syringe, causing the bladder to rapidly seal the proximal and distal ends of the renal artery and inferior vena cava, forming an isolation zone and completing the bladder inflation and occlusion phase. This step blocks the connection between the kidney and systemic circulation, creating conditions for subsequent local perfusion. When the bladder is fully inflated, the retaining pad contacts the travel strip, triggering the elastic component to contract and store force. The first pusher stops moving, but the movable plate can continue to move, driving the second pusher to push the saline syringe, achieving a seamless switch between the perfusion phases.

[0018] The strictly separated two-stage process avoids human error in timing during operation, ensuring that perfusion only begins after the blood vessel is sealed. The mechanical interlocking mechanism between the retainer and the travel strip mandates that perfusion can only begin after the balloon has fully expanded, eliminating the risk of misoperation at the hardware level. Furthermore, compared to conventional manual syringe operation (traditional step-by-step operation requires the operator to manually switch syringes, easily leading to unstable balloon pressure or delayed perfusion), the mechanical automation integrates the two steps, shortening operation time and reducing the risk of vascular tearing or thrombus detachment due to operational errors. The seamless switching between the injection expansion and perfusion stages ensures high efficiency, and the mechanically pushed perfusion flow is more uniform and effective.

[0019] This invention also allows for the movement of a rack plate via an electric actuator, which in turn drives a driving gear to rotate, which in turn drives a driven gear to rotate. The rotation of the driven gear causes the two racks to move away from each other, thus adjusting the two sliding sleeves to be positioned one in front of the other on the movable plate. This structure ensures a strict sequence of action: the bladder expands first, followed by catheter injection. Furthermore, this design allows for stepless adjustment within the track length of the movable plate, providing a wider adjustment range and greater flexibility. The electric actuator allows for precise setting of the initial interval between the two actuators, thereby accurately controlling the timing of the switch between bladder expansion and perfusion, ensuring it strictly conforms to operational expectations. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0021] Figure 1 This is a schematic diagram of the connection between the renal hemoperfusion device and the catheter in an embodiment of the present invention for use before renal ischemia;

[0022] Figure 2 This is a schematic diagram of the renal hemoperfusion device used for renal ischemia in an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the internal structure of a renal hemoperfusion device for renal ischemia in an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of the pusher component in an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the structure of the adjusting member and the pushing member in an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the rear structure of the adjusting member and the pushing member in an embodiment of the present invention;

[0027] Figure 7 This is a side view of the adjusting member and the pushing member in an embodiment of the present invention;

[0028] Figure 8 This is a cross-sectional view of the catheter in an embodiment of the present invention.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Housing; 2. Fastener; 3. Movable plate; 4. Moving mechanism; 400. Slide rod; 401. Movable plate; 402. Lead screw; 403. Motor; 5. Pushing component; 500. Sliding sleeve; 501. Moving sleeve; 502. Elastic component; 503. Baffle; 504. Stroke bar; 505. Push rod; 6. Adjusting component; 600. Driven gear; 601. Rack; 602. Rack plate; 603. Electric push rod; 604. Driving gear; 7. Control console; 8. Tubing; 9. Infusion channel; 10. Fluid bladder. Detailed Implementation

[0031] The technical solutions provided by the present invention will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. 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] In the description of this invention, if terms such as "upper," "lower," "left," "right," "top," "bottom," "inner," and "outer" are used to indicate the orientation or positional relationship, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0033] Example 1

[0034] This invention provides a renal hemoperfusion device for use before renal ischemia, comprising a housing 1, a pair of fasteners 2, a movable plate 3, and a pair of pushing components 5. Wherein, as... Figures 2 to 4 As shown, a pair of fasteners 2 are provided on the right side of the front side of the housing 1 for fixing the syringe; the movable plate 3 is set inside the housing 1 through the moving mechanism 4, and the moving mechanism 4 can drive the movable plate 3 to move left and right inside the housing 1 to move closer to or away from the fasteners 2 (or syringe) on the right side; a pair of pushers 5 are both set on the movable plate 3 for pushing the piston handle in the syringe. The fastener 2 includes a concave arc-shaped placement plate set on the side of the housing 1, and an arc-shaped sleeve is detachably set on its side. The arc-shaped sleeve can lock and fix the syringe in the fastener 2. A flexible anti-slip pad layer can be set on the side of the arc-shaped sleeve that is pressed and fitted against the outer wall of the syringe.

[0035] like Figure 3 , Figure 4 and Figure 5 As shown, the pusher 5 includes a sliding sleeve 500, a moving sleeve 501, a retaining pad 503, a travel bar 504, and a push rod 505; the sliding sleeve 500 is disposed on the side of the movable plate 3, preferably, as shown in the figure. Figure 6As shown, the sliding sleeve 500 is slidably disposed on the side of the movable plate 3 via a dovetail strip; the movable sleeve 501 is slidably inserted into the sliding sleeve 500, and an elastic member 502 is provided between the sliding sleeve 500 and the movable sleeve 501 to support the movable sleeve 501; the retaining pad 503 is disposed on the side of the movable sleeve 501, and the retaining pad 503 is arranged outside the sliding sleeve 500, and the side of the sliding sleeve 500 is provided with a slot for the retaining pad 503 to slide; the stroke bar 504 is disposed on the housing 1, and the stroke bar 504 corresponds to the retaining pad 503; the push rod 505 is disposed at the right end of the movable sleeve 501 (the end facing the syringe), the length of the push rod extending out of the movable sleeve 501 is adjustable, and the right end of the push rod 505 can contact the movable handle in the syringe.

[0036] In this embodiment, the push rod 505 and the moving sleeve 501 are preferably connected by threads, which means that the distance between the right ends of the two push rods 505 on the horizontal projection plane can be adjusted. In addition to the threaded connection, other adjustable connection methods can also be used. The elastic member 502 can be a spring or a spring telescopic rod.

[0037] like Figure 1 and Figure 8 As shown, the tubing used with the perfusion device includes a conduit 8, which has an infusion channel 9. Multiple fluid sacs 10 are located in the middle of the conduit 8, and the infusion channel 9 is connected to the fluid sacs 10. The conduit 8 also has an irrigation channel, which is independent of the infusion channel. The infusion channel is connected to one syringe, and the irrigation channel is connected to another syringe.

[0038] Specifically, during pre-irrigation of the kidneys before ischemia, catheter 8 is first inserted into the patient's renal artery under ultrasound guidance. Then, two syringes are sequentially connected to the side of catheter 8 (each fixed within a corresponding fastener 2), and the initial positions of the two push rods 505 are adjusted so that the push rod 505 used for injecting the balloon 10 is in a forward position. The moving mechanism 4 is then activated, driving the movable plate 3 to move within the housing 1, which in turn moves the two pushers 5 forward synchronously. At this point, the push rod 505, which moves first, pushes the syringe used for inflating the balloon 10, causing the balloon 10 on catheter 8 to rapidly inflate, thereby sealing the proximal and distal ends of the aorta and inferior vena cava. After the balloon 10 has inflated, the retainer 503 corresponding to the push rod 505 contacts the travel bar 504.

[0039] As the movable plate 3 continues to move, one push rod 505 of the expansion bladder 10 will stop moving (the corresponding elastic member 502 will contract and store energy) and retract into the corresponding sliding sleeve 500. The other push rod 505 for irrigation will contact the corresponding syringe to inject saline solution into the kidney for irrigation. When the movable plate 3 moves back to its original position, the elastic member 502 will release its potential energy, thereby causing the corresponding push rod 505 to move back to its original position. The elastic member 502 can be initially set to maintain a certain amount of elastic potential energy to ensure that the push rod 505 will not be compressed or shortened when pushing the piston rod of the syringe (the pushing force required at this time is generally not large).

[0040] Through this design, the first pusher 5 (push rod 505) preferentially pushes the balloon to expand the syringe, causing the balloon 10 to quickly seal the proximal and distal ends of the renal artery and inferior vena cava, forming an isolation zone. This step blocks the connection between the kidney and the systemic circulation, creating conditions for subsequent local perfusion. When the balloon 10 is fully expanded, the retainer 503 contacts the travel bar 504. At this time, the sliding sleeve 501 cannot continue to move to the right due to the restriction of the travel bar. The increased pressure of the travel bar 504 on the retainer triggers the elastic member 502 to contract and store force. At the same time, the movable plate 3 continues to move, driving the second pusher 5 to push the saline syringe, achieving a seamless switch from the balloon expansion and blockage stage to the perfusion stage.

[0041] The strict separation of the two stages avoids human timing errors during operation, ensuring that perfusion is initiated only after the blood vessel is sealed. The mechanical interlocking mechanism between the retainer 503 and the travel bar 504 forces the inflatable balloon 10 to be fully inflated before perfusion can be started, eliminating the risk of misoperation from a hardware perspective. At the same time, compared with conventional manual operation of syringes, it is faster (traditional step-by-step operation requires the operator to manually switch syringes, which can easily lead to unstable pressure of the inflatable balloon 10 or delayed perfusion). By integrating the two steps through mechanical automation, the operation time is shortened and the risk of vascular tearing or thrombus dislodgement caused by operational errors is reduced.

[0042] like Figure 1 and Figure 2 As shown, a control console 7 is provided on the side of the housing 1. The control console 7 includes a display screen, operation buttons and a controller (CPU).

[0043] like Figure 3As shown, the travel bar 504 is disposed within the housing 1 via a driving component. The driving component can be a servo electric actuator, a threaded rod moving structure, or a sliding structure, etc., which can adjust and position the travel bar 504 left and right. In one specific embodiment, the driving component includes two left and right hinge supports disposed within the housing 1, an adjusting screw rotatably connected to the two hinge supports, and a moving block helically connected to the adjusting screw. The upper and lower sides of the moving block can be configured with guide rods (horizontally arranged in the left and right direction) to limit its movement. The moving block slides against the guide rods. The housing 1 is provided with a guide groove, through which the travel bar passes and is fixedly connected to the moving block. The rotation adjustment of the adjusting screw is preferably achieved using a corresponding matching motor.

[0044] Implementation 2

[0045] This embodiment is a further optimization based on the first embodiment described above. The parts that are the same as those in the aforementioned technical solution will not be repeated here. Figure 4 , Figure 5 and Figure 6 As shown, in order to better realize the present invention, the following arrangement is adopted. In this embodiment, the movable plate 3 is also provided with an adjusting member 6, which is used to adjust the position arrangement of the two pushing members 5 on the movable plate 3.

[0046] The adjusting component 6 includes a driven gear 600, a pair of racks 601, and a driving component. The driven gear 600 is rotatably mounted on the side of the movable plate 3. The pair of racks 601 are mounted on the corresponding sliding sleeves 500, and the two racks 601 mesh with the driven gear 600. The driving component is mounted on the movable plate 3 and is used to drive the driven gear 600 to rotate.

[0047] like Figure 6 As shown, the driving component includes a rack plate 602, an electric actuator 603, and a drive gear 604. The rack plate 602 is slidably disposed at the bottom of the movable plate 3. The electric actuator 603 is disposed at the bottom of the movable plate 3, and its output end is connected to the rack plate 602. The electric actuator 603 is a servo electric actuator. The drive gear 604 is rotatably disposed at the bottom of the movable plate 3, and it meshes with the rack plate 602. The drive gear 604 is connected to the driven gear 600 via a synchronous belt. The driving component can also be a servo motor.

[0048] Specifically, the rack plate 602 can be moved by the electric actuator 603, which in turn drives the driving gear 604 to rotate, thereby driving the driven gear 600 to rotate. The rotation of the driven gear 600 causes the two racks 601 to move away from each other, thus adjusting the two sliding sleeves 500 to be arranged one in front of the other on the movable plate 3. This structure ensures a strict sequence of action: the bladder 10 expands first, followed by the injection of the catheter 8. Unlike manual adjustment, which may have thread travel limitations, this design does not rely on thread travel limitations and can achieve stepless adjustment within the track length of the movable plate 3, providing a wider adjustment range and greater flexibility. The initial interval between the two actuators 505 can be precisely set by the electric actuator 603, thereby accurately controlling the switching timing of the bladder 10 expansion and infusion actions, ensuring that it strictly conforms to the expected operation.

[0049] Example 3

[0050] This embodiment is a further optimization based on the first embodiment described above. The parts that are the same as those in the aforementioned technical solution will not be repeated here. Figure 4 As shown, to better realize the present invention, the following arrangement is specifically adopted. In this embodiment, the moving mechanism 4 includes a pair of slide rods 400, a lead screw 402, and a motor 403; the pair of slide rods 400 are disposed inside the housing 1, and a moving plate 401 is slidably disposed between the two slide rods 400; the lead screw 402 is rotatably disposed inside the housing 1, and the moving plate 401 is threadedly connected to the lead screw 402; the motor 403 is disposed on the side of the housing 1 and is used to drive the lead screw 402 to rotate; the movable plate 3 is disposed on the moving plate 401.

[0051] Specifically, the use of the moving mechanism 4 is achieved by driving the lead screw 402 to rotate via the motor 403, thereby causing the moving plate 401 to slide back and forth on the two slide rods 400, which in turn drives the movable plate 3 to move within the housing 1, thus completing the injection of the two syringes.

[0052] Specifically, the control method of the present invention is controlled by a controller. The control circuit of the controller can be implemented by those skilled in the art through simple programming, and the control method and circuit connection will not be explained in detail here.

[0053] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0054] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

[0055] 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 principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A kidney blood perfusion device for use in pre-ischemic kidneys, characterized in that, The utility model provides a kind of injection device, including shell (1), fastener (2), movable plate (3), moving mechanism (4) and pusher (5), one side of the shell (1) is arranged with a pair of the fastener (2) at intervals, two fastener (2) are used to respectively fix one syringe;Movable plate (3) is arranged on the shell (1) by moving mechanism (4), and moving mechanism (4) can drive movable plate (3) on the shell (1) close to or away from the syringe;Movable plate (3) is provided with a pair of pusher (5) for respectively pushing the piston handle in two syringes;The pusher (5) includes slide sleeve (500), moving sleeve (501) and elastic member (502), the slide sleeve (500) is arranged on the side of movable plate (3), the moving sleeve (501) is slidably inserted in the slide sleeve (500), and the elastic member (502) is arranged between the inside of the slide sleeve (500) and the moving sleeve (501);The side of moving sleeve (501) is fixedly provided with fender (503), and the fender (503) extends from the sliding groove axially opened on the side wall of the slide sleeve (500);The shell (1) is also provided with a pair of travel strips (504) corresponding to two fenders (503) respectively, when the fender (503) and the travel strip (504) abut, the corresponding moving sleeve (501) stops moving in the direction of the syringe;The end of moving sleeve (501) close to fender (503) is provided with adjustable length push rod (505), and the push rod (505) is used to push the piston handle in the syringe; The travel strip (504) is arranged on the shell (1) by driving member, and the distance between the travel strip (504) and the fastener (2) is adjustable; The driving member includes two hinge supports arranged in the shell, adjusting screw connected with the hinge supports and moving block connected with the adjusting screw, the shell is provided with guide slot, and the travel strip (504) is fixedly connected with the moving block after passing through the guide slot; The movable plate (3) is also provided with adjusting member (6), and the adjusting member (6) is used to adjust the position of two pushers (5) on the movable plate (3).

2. The pre-ischemic renal perfusion device of claim 1, wherein, The slide sleeve (500) is slidably arranged on the movable plate (3) by dovetail strip.

3. The pre-ischemic renal perfusion device of claim 1, wherein, The adjusting member (6) includes driving member, driven gear (600) and a pair of racks (601), the driven gear (600) is rotatably arranged on the movable plate (3), the two racks (601) are arranged in parallel and at intervals, and are fixedly connected with corresponding slide sleeves (500), the two racks (601) are respectively engaged with the driven gear (600), and the driving member is arranged on the movable plate (3) and used to drive the driven gear (600) to rotate.

4. The pre-ischemic renal perfusion device of claim 3, wherein the at least one porous material is a porous material having a pore size of 0.1 to 10 microns. The driving member comprises a rack plate (602), an electric push rod (603) and a driving gear (604), the rack plate (602) is slidingly arranged on the back of the movable plate (3), the electric push rod (603) is fixedly arranged on the back of the movable plate (3), and the telescopic end of the electric push rod (603) is fixedly connected with one end of the rack plate (602), the rack plate (602) is engaged with the driving gear (604) which is rotatably arranged on the back of the movable plate (3), the driving gear (604) is coaxially connected with a synchronous pulley which is located on the front of the movable plate (3), and the synchronous pulley is drivingly connected with a transmission pulley which is coaxially connected with the driven gear (600) through a synchronous belt.

5. The pre-ischemic renal perfusion device of claim 1, wherein, The moving mechanism (4) comprises two slide rods (400), a moving plate (401), a lead screw (402) and a motor (403), the two slide rods (400) are parallelly and spacedly arranged in the shell (1), the moving plate (401) is slidingly arranged between the two slide rods (400), the lead screw (402) is rotatably arranged in the shell (1), the moving plate (401) is screwingly connected with the lead screw (402), the motor (403) is arranged on one side of the shell (1) and used for driving the lead screw (402) to rotate, and the movable plate (3) is fixedly arranged on the moving plate (401).

6. The pre-ischemic renal perfusion device of claim 1, wherein, The elastic member (502) is a spring or a spring type telescopic rod.

7. A pre-ischemic renal perfusion device for kidneys according to any one of claims 1-6, characterized in that, The shell (1) is provided with a control console (7).

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