Liver membrane anatomy expander

Abstract

The utility model discloses a liver membrane anatomy expander which comprises a control handle, a loop bar and an expansion head. The front end of the sleeve rod is detachably connected with the expansion head, and a movable rod is arranged in the sleeve rod. A clamping assembly is arranged at the front end of the movable rod, the tightness of clamping petals is controlled by pulling or loosening a pull wire, and then the annular protrusion of the expansion head and the arc-shaped grooves of the clamping petals are controlled to be matched with each other so that clamping and loosening of the expansion head can be achieved. According to the utility model, the expansion heads with different models and different shapes and sizes can be detachably replaced, so that the device can be suitable for livers with different sizes and can be conveniently and directly replaced; secondly, the pull rod assembly is used for controlling the fixing and loosening of a wedge-shaped groove of the wedge-shaped block to control the front-back movement of the movable rod; the dilated liver can be fixed, the fixing mode is simple and efficient, and doctors can conveniently and rapidly operate the liver.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical devices, and in particular relates to a liver membrane dissection expander. Background Art

[0002] Liver membrane dissection is a surgical technique designed to manipulate and treat the membrane structure of the liver. The liver is covered with multiple membranes, including perihepatic fibrous tissue, liver capsule membrane, and intrahepatic vascular membrane. Liver membrane dissection is often performed in complex liver surgeries, such as liver resection and liver transplantation. Liver membrane dissection can reveal and expose the surface and deep structures of the liver, allowing surgeons to better access areas that need treatment or resection. By dissecting and treating the membrane layers, lesions or organ anatomy can be clearly located, and bleeding can be reduced and surrounding tissues can be protected.

[0003] When performing liver membrane dissection, it is often necessary to use duckbill forceps to open the liver. Duckbill forceps can be used to temporarily fix the liver so that the surgeon can better expose the surgical area. By placing the mouth of the forceps on the surface of the liver and applying appropriate pressure, the surgical area can be stabilized and the interference of tissue movement during the operation can be reduced. Duckbill forceps play a very important role in liver membrane dissection; however, the current duckbill forceps have a large shape and structure, which is not convenient for opening, and they are in an integrated form, which is not convenient for corresponding disassembly and replacement. It is not possible to choose to replace the head of different models and sizes according to the size of the patient's liver, which will cause a lot of inconvenience to the surgery for patients with smaller livers;

[0004] Therefore, there is a need for a liver membrane dissection expander, the head end of which is detachable and replaceable with different models to adapt to the expansion of livers of different sizes, and the shape and size of the head end are more consistent with the structure of the human liver. Utility Model Content

[0005] In order to solve the above technical problems, the utility model discloses a liver membrane dissection expander, comprising: a control handle, a sleeve rod, and an expansion head; the sleeve rod is a hollow structure, the lower side of the rear end of the sleeve rod is rotatably connected to the control handle, and the front end of the sleeve rod is detachably connected to the expansion head; the expansion head comprises an expansion plate, a connecting head, and a moving plate; the expansion plate is rotatably connected to a fixed shaft arranged inside the expansion head, and the two expansion plates are connected by a spring; a moving cylinder is arranged at the rear end of the fixed shaft, and the outer wall of the moving cylinder is symmetrically rotatably connected to a support plate, and the middle part of the support plate is connected to the inner wall of the expansion head by a spring; a connecting head is arranged at the rear end of the moving cylinder, and an annular protrusion is arranged at the rear end of the connecting head;

[0006] A movable rod is arranged inside the sleeve rod, and a clamping assembly is arranged at the front end of the movable rod, and the clamping assembly includes a clamping petal and a collar; the clamping petal is arranged in a circumferential array at the front end of the movable rod, and an arc groove is arranged on the clamping petal; the collar is movably sleeved on the outer wall of the clamping petal, and a spring is installed at the rear end of the collar, and a pull wire is fixedly arranged on the spring, and the pull wire extends to the front end of the control handle and passes through; the tightness of the clamping petal is controlled by pulling or loosening the pull wire, and then the annular protrusion of the expansion head and the arc groove of the clamping petal are controlled to cooperate with each other to realize clamping and loosening with the expansion head;

[0007] The control handle comprises a fixed seat and a movable plate; the movable plate is rotatably connected to the inside of the fixed seat, a plurality of wedge blocks are arranged in a linear array on one side of the movable seat, a pull rod assembly is arranged at the position of the wedge block corresponding to the upper end of the fixed seat; a wedge groove is opened at the front end of the pull rod assembly, and the fixing and loosening of the wedge groove of the wedge block are controlled by the pull rod assembly to control the forward and backward movement of the movable rod;

[0008] Furthermore, the pull rod assembly includes a pull rod, a fixing plate, and a spring; the pull rod passes through the fixing seat and the front end is fixedly connected to the fixing plate, the front end linear array of the fixing plate has a plurality of wedge-shaped grooves, the spring is sleeved on the outside of the pull rod and is located between the fixing plate and the inner wall of the fixing seat;

[0009] Furthermore, a square groove is provided at the lower part of the rear end of the movable rod, the movable plate is rotatably mounted on the square groove, and the rotatable connection on the square groove is an arc groove;

[0010] Furthermore, the expansion plate has a thickness between 1 mm and 2 mm, a width between 8 mm and 10 mm, and a length between 4 mm and 5 mm;

[0011] The beneficial effects of the utility model are:

[0012] The utility model has the expansion head detachably connected to the front end of the sleeve rod, a movable rod is arranged inside the sleeve rod, and a clamping assembly is arranged at the front end of the movable rod, which controls the tightness of the clamping flap by pulling or loosening the pull wire, and then controls the cooperation between the annular protrusion of the expansion head and the arc groove of the clamping flap to achieve clamping and loosening of the expansion head; compared with the traditional device, the expansion head of different models and different shapes and sizes can be detachably replaced, which can be suitable for livers of different sizes and is convenient for direct replacement; secondly, the utility model has a pull rod assembly at the position of the wedge block corresponding to the upper end of the fixing seat in the control handle; a wedge groove is opened at the front end of the pull rod assembly, and the fixing and loosening of the wedge groove of the wedge block are controlled by the pull rod assembly to control the forward and backward movement of the movable rod; compared with the traditional device, the liver can be fixed after expansion, and the fixing method is simple and efficient, which is convenient for doctors to operate quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for describing the embodiments are briefly introduced below.

[0014] Figure 1 It is a schematic diagram of the overall structure of a liver membrane anatomical expander;

[0015] Figure 2 It is a cross-sectional view of a liver membrane dissection expander;

[0016] Figure 3 It is a schematic diagram of the internal structure of an expansion head in a liver membrane dissection expander;

[0017] Figure 4 The figure is a schematic diagram of the overall structure of an expansion head of a liver membrane dissection expander;

[0018] Figure 5 The figure is a schematic diagram of the overall structure of the rear view of the extension head of the liver membrane dissection extender;

[0019] Figure 6 It is a schematic diagram of the internal structure of the movable rod of a liver membrane dissection expander;

[0020] Figure 7 is a partial cross-sectional view of a control handle of a liver membrane dissection expander;

[0021] Figure 8 The present invention is a schematic diagram of the overall structure of a fixing seat and internal components of a liver membrane dissection expander;

[0022] Fig. 9 The present invention is a schematic diagram of the structure of a fixing seat of a liver membrane dissection expander;

[0023] Fig.10 The present invention is a schematic diagram of the position structure of a pull rod assembly of a liver membrane dissection expander;

[0024] Fig.11 It is a schematic structural diagram of an implementation method of Example 4 of a liver membrane dissection expander;

[0025] Fig.12 The figure is a front view of the expansion head of the embodiment 4 of the liver membrane dissection expander.

[0026] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0027] 1- sleeve rod, 11- movable rod, 12- spring, 13- clamping petal, 14- sleeve ring, 2- control handle, 21- fixed seat, 22- movable plate, 23- wedge block, 231- wedge groove, 232- fixed plate, 24- arc groove, 25- pull rod assembly, 3- expansion head, 31- pull wire, 311- pull ring, 32- fixed shaft, 33- movable cylinder, 331- U-shaped through groove, 332- support plate, 34- connecting head, 341- annular protrusion, 35- expansion plate, 36- support head, 361- upper expansion plate, 362- lower expansion plate, 363- sawtooth. DETAILED DESCRIPTION

[0028] The utility model discloses a liver membrane dissection expander, comprising: a control handle 2, a sleeve rod 1, and an expansion head 3; the sleeve rod 1 is a hollow structure, the lower side of the rear end of the sleeve rod 1 is rotatably connected to the control handle 2, and the front end of the sleeve rod 1 is detachably connected to the expansion head 3; the expansion head 3 comprises an expansion plate 35, a connecting head 34, and a moving plate; the expansion plate 35 is rotatably connected to a fixed shaft 32 arranged inside the expansion head 3, and the two expansion plates 35 are connected by a spring 12; a moving cylinder 33 is arranged at the rear end of the fixed shaft 32, and the outer wall of the moving cylinder 33 is symmetrically rotatably connected to a support plate 332, and the middle part of the support plate 332 is connected to the expansion head 3 by a spring 12 On the inner wall of the expansion head 3; the rear end of the moving cylinder 33 is provided with a connecting head 34, and the front end is provided with a U-shaped through groove 331. The U-shaped through groove 3 can allow the rotating shaft to pass through when the moving cylinder 33 moves to ensure normal movement. The rear end of the connecting head 34 is provided with an annular protrusion 341; at the same time, the support plates 332 arranged on both sides of the moving cylinder can ensure that the position of the moving cylinder 33 will not fall. At the same time, the support plates 332 are connected by springs 12 without affecting the forward and backward movement of the moving cylinder 33. However, when in use, it is necessary to overcome the elastic force brought by the spring 12 in this part. When the stiffness coefficient of the spring 12 is small, it does not affect its use;

[0029] A movable rod 11 is arranged inside the sleeve rod 1, and a clamping assembly is arranged at the front end of the movable rod 11, and the clamping assembly includes a clamping petal 13 and a collar 14; the clamping petals 13 are arranged in a circumferential array at the front end of the movable rod 11, and an arc groove 24 is provided on the clamping petal 13; the collar 14 is movably sleeved on the outer wall of the clamping petal 13, and a spring 12 is installed at the rear end of the collar 14, and a pull wire 31 is fixedly arranged on the spring 12, and the pull wire 31 extends to the front end of the control handle 2 and passes through; the tension of the clamping petal 13 is controlled by pulling or loosening the pull wire 31, and then the annular protrusion 341 of the expansion head 3 and the arc groove 24 of the clamping petal 13 are controlled to cooperate with each other to achieve clamping and loosening with the expansion head 3;

[0030] The control handle 2 includes a fixed seat 21 and a movable plate 22; the movable plate 22 is rotatably connected to the inside of the fixed seat 21, and a plurality of wedge blocks 23 are arranged in a linear array on one side of the movable seat; a pull rod assembly 25 is arranged at the upper end of the fixed seat 21 at a position corresponding to the wedge block 23; a wedge groove 231 is opened at the front end of the pull rod assembly 25, and the fixing and loosening of the wedge groove 231 of the wedge block 23 is controlled by the pull rod assembly 25 to control the forward and backward movement of the movable rod 11;

[0031] Example 1

[0032] In this embodiment, the pull rod assembly 25 includes a pull rod, a fixed plate 232, and a spring 12; the pull rod passes through the fixed seat 21 and the front end is fixedly connected to the fixed plate 232, the front end linear array of the fixed plate 232 has a plurality of wedge-shaped grooves 231, the spring 12 is sleeved on the outside of the pull rod and is located between the fixed plate 232 and the inner wall of the fixed seat 21; the movement of the movable plate 22 can be controlled by the pull rod assembly 25, and then the movement of the movable rod 11 can be controlled, so that the expansion angle of the expansion plate 35 in the expansion head 3 can be relatively fixed; the specific principle The process is that when the movable plate 22 is pressed, the wedge block 23 at the upper end of the movable plate 22 will move inward with the movable plate 22; at this time, the wedge groove 231 on the fixed plate 232 will be fixed with the wedge block 23, that is, the movable plate 22 can move inward but cannot move outward. When it is necessary to move outward, the pull rod is pulled, and under the action of the pulling force, the spring 12 is compressed, and the fixed plate 232 moves outward with the pressure rod. At this time, the wedge block 23 and the wedge groove 231 are no longer fixed, and the movable plate 22 can move outward.

[0033] In this embodiment, the expansion plate has a thickness of 1 mm to 2 mm, a width of 8 mm to 10 mm, and a length of 4 mm to 5 mm. By adjusting the thickness, the expansion plate can be closer to the surface of the liver during use, thereby achieving a good expansion effect.

[0034] Example 2

[0035] In this embodiment, a square groove is provided at the lower rear end of the movable rod 11, and the movable plate 22 is rotatably mounted on the square groove, and the rotating connection on the square groove is an arc groove 24; the arc groove 24 can ensure that the movable plate 22 can drive the movable rod 11 to move back and forth when moving. Since the place where the rotating shaft at the upper end of the movable plate 22 is connected moves in an arc when the movable plate 22 is pressed, in order to ensure that the movement can proceed smoothly, the rotating connection on the square groove is set to an arc groove 24, thereby ensuring the feasibility of the movement.

[0036] Example 3

[0037] In this embodiment, when it is necessary to replace the expansion head 3, first, pull the pull ring 311, and the pull ring 311 drives the pull wire 31 to move outward. At this time, the pull wire 31 fixed on the spring 12 pulls the spring 12 to move backward, and the fixing ring is no longer affected by the elastic force of the spring 12, and the clamping petal 13 also expands outward. After the expansion, the annular protrusion 341 and the arc groove 24 on the clamping petal 13 no longer form a mutually fixed effect. At this time, rotate the expansion head 3 and remove the entire expansion head 3; when it is necessary to replace another expansion head 3, directly rotate the expansion head 3, and pull the pull ring 311 when screwing the expansion head 3 in, so that the clamping petal 13 is in an outward expanded state again. After the expansion head 3 is turned to the corresponding position, release the pull ring 311. At this time, the arc groove 24 on the clamping petal 13 is just stuck into the annular protrusion 341 of the connecting head 34 to form a clamping and fixing effect, and it can be used.

[0038] Example 4

[0039] In this embodiment, another method is provided for liver membrane dissection expansion, and the working principle of the expander described in the above embodiments 1-3 can be used to improve the existing duckbill forceps, specifically as follows Fig.11 , 12 As shown, the spreading head 36 is connected to the sleeve rod 1, and the spreading head includes an upper expansion plate 361 and a lower expansion plate 362; the upper expansion plate 361 and the lower expansion plate 362 are rotatably connected together, and the inner side surfaces of the upper and lower expansion plates are fixedly provided with saw teeth 363; the upper expansion plate 361 and the lower expansion plate 362 can be used as expansion when the liver membrane is dissected and separated, and the saw teeth 363 are provided inside and can be used as clamps at the same time. In addition, the curvature of the upper expansion plate 361 and the lower expansion plate 362 is between 10°-15°, and the thickness is smaller than the duckbill forceps in the prior art, and has a certain linear change, and the thickness is between 2mm-3mm; because it is used in the dissection of the liver membrane, the angle requirement for its expansion cannot be very large. According to clinical experience, the expansion angle between 0°-40° is a better choice. A small opening angle meets the expansion requirement, while a too large opening angle may cause liver damage. Therefore, it is necessary to control the appropriate thickness size and angle.

[0040] The use principle of the utility model is as follows: after the preparation work is completed, the whole device is used under laparoscope. When expansion is needed during use, the movable plate 22 is pressed. Under the action of the movable plate 22 driving the movable rod 11, the expansion plates 35 at the front end will be close to each other. When the expansion is needed after reaching the designated position, the pull rod assembly 25 is pulled to release the expansion plate 35 at the front end to achieve the expansion effect; when it is expanded to the designated size, the pulling assembly is released to fix the position of the expansion plate 35 at this time; when the expansion head 3 at the front end needs to be replaced, the pull ring 311 is pulled and the expansion head 3 at the front end is rotated at the same time. At this time, the expansion head 3 can be removed. When it needs to be installed, the replaced expansion head 3 is directly rotated until it is rotated to the corresponding position to complete the replacement.

[0041] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the present invention to the specific implementation methods described.

Claims

1. A liver membrane dissection expander, characterized in that: include: A control handle, a sleeve rod, and an expansion head; the sleeve rod is a hollow structure, the lower side of the rear end of the sleeve rod is rotatably connected to the control handle, and the front end of the sleeve rod is detachably connected to the expansion head; the expansion head includes an expansion plate, a connecting head, and a movable plate; the expansion plate is rotatably connected to a fixed shaft arranged inside the expansion head, and the two expansion plates are connected by a spring; a movable cylinder is arranged at the rear end of the fixed shaft, and a support plate is symmetrically rotatably connected to the outer wall of the movable cylinder, and the middle part of the support plate is connected to the inner wall of the expansion head by a spring; a connecting head is arranged at the rear end of the movable cylinder, and an annular protrusion is arranged at the rear end of the connecting head; A movable rod is arranged inside the sleeve rod, and a clamping assembly is arranged at the front end of the movable rod, and the clamping assembly includes a clamping petal and a collar; the clamping petal is arranged in a circumferential array at the front end of the movable rod, and an arc groove is arranged on the clamping petal; the collar is movably sleeved on the outer wall of the clamping petal, and a spring is installed at the rear end of the collar, and a pull wire is fixedly arranged on the spring, and the pull wire extends to the front end of the control handle and passes through; the tightness of the clamping petal is controlled by pulling or loosening the pull wire, and then the annular protrusion of the expansion head and the arc groove of the clamping petal are controlled to cooperate with each other to realize clamping and loosening with the expansion head; The control handle includes a fixed seat and a movable plate; the movable plate is rotatably connected to the inside of the fixed seat, and a plurality of wedge blocks are arranged in a linear array on the movable side; a pull rod assembly is arranged at the position of the wedge block corresponding to the upper end of the fixed seat; a wedge groove is opened at the front end of the pull rod assembly, and the fixing and releasing of the wedge groove of the wedge block are controlled by the pull rod assembly to control the forward and backward movement of the movable rod.

2. A liver membrane dissection expander according to claim 1, characterized in that: The pull rod assembly includes a pull rod, a fixed plate, and a spring; the pull rod passes through the fixed seat and the front end is fixedly connected to the fixed plate, the front end linear array of the fixed plate has a plurality of wedge-shaped grooves, the spring is sleeved on the outside of the pull rod and is located between the fixed plate and the inner wall of the fixed seat.

3. A liver membrane dissection expander according to claim 1, characterized in that: A square groove is arranged at the lower part of the rear end of the movable rod, and the movable plate is rotatably mounted on the square groove, and the rotation connection part on the square groove is an arc groove.

4. A liver membrane dissection expander according to claim 1, characterized in that: The expansion board has a thickness of 1 mm to 2 mm, a width of 8 mm to 10 mm, and a length of 4 mm to 5 mm.

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