Ring-pull retroperitoneal fat removal device

Abstract

The present application relates to the field of medical devices. The ring pull type retroperitoneal fat removal device comprises a shell for gripping, a sheath detachably connected to the front end of the shell, and a negative pressure connector provided at the rear end of the shell. A rotatable inner tube is arranged in the sheath and the shell, the front end of the inner tube is a blade, and the rear end of the inner tube is in communication with the negative pressure connector. The puller comprises a ring and a straight rack connected in sequence, the ring is located outside the shell, the puller is slidingly connected with the shell, and the sliding direction of the puller is perpendicular to the rotation center line of the inner tube. The puller is drivingly connected with the inner tube through a transmission mechanism. The device only needs to extend the sheath and the inner tube into the surgical incision, cut the fat in the incision, and then remove it by negative pressure suction. It does not need to extend the incision, and the fat is removed minimally invasively. The device quickly and safely establishes the retroperitoneal space, shortens the operation time, and reduces the risks of the patient.

Description

Technical Field

[0001] This invention relates to the field of medical devices, specifically to fat removal equipment. Background Technology

[0002] Renal cell carcinoma is a common malignant tumor in urology, accounting for 2%-3% of adult malignant tumors. Although its incidence is lower than that of bladder cancer and prostate cancer, it is the most deadly malignant tumor of the urinary system. Surgical intervention is the preferred treatment for localized renal cell carcinoma. Surgical approaches for renal cell carcinoma include transabdominal and transperitoneal (translumbar) approaches. The transperitoneal approach has advantages such as less trauma, easier arterial location during surgery, less impact on gastrointestinal function recovery, allowing patients to eat early, and faster postoperative recovery. However, the retroperitoneal space is relatively small in this approach, requiring the removal of retroperitoneal fat during surgery to provide better surgical space.

[0003] Currently, the main methods for removing retroperitoneal fat during surgery are either dividing the fat into small pieces for removal or extending the incision for removal. The piecewise removal method is time-consuming and laborious, while the extended incision method causes unnecessary damage to the patient and is prone to wound pain and delayed healing.

[0004] Therefore, how to quickly remove retroperitoneal fat is a major problem that urgently needs to be solved. Currently, there is a lack of equipment that can achieve minimally invasive surgery while quickly and conveniently creating better retroperitoneal cavities. Summary of the Invention

[0005] In view of the problems existing in the prior art, the present invention provides a ring-type retroperitoneal fat removal device to solve at least one of the above technical problems.

[0006] To achieve the above objectives, the present invention provides a ring-type pull-out retroperitoneal fat removal device, comprising a housing for gripping, characterized in that a protective sleeve is detachably connected to the front end of the housing, and a negative pressure connector is provided at the rear end of the housing.

[0007] It also includes a rotatable inner tube disposed within the sheath and the housing, the front end of the inner tube being a cutting edge, and the rear end of the inner tube being connected to the negative pressure connector.

[0008] It also includes a pull-out component, which includes a finger ring and a straight rack connected in sequence. The finger ring is located on the outside of the housing. The pull-out component is slidably connected to the housing, and the sliding direction of the pull-out component is perpendicular to the rotation center line of the inner tube.

[0009] The pull-out component is connected to the inner tube via a transmission mechanism.

[0010] This device only requires inserting the sheath and inner tube into the surgical incision to cut the fat within the incision and then remove it using negative pressure suction. It eliminates the need for an extended incision, allowing for minimally invasive fat removal. It quickly and safely establishes the retroperitoneal cavity, shortening surgical time and reducing various risks for the patient.

[0011] This device uses the reciprocating motion of the pull-out mechanism to rotate the inner tube, thereby cutting fat. During surgery, the rotation and orientation of the inner tube are easily controlled. The inner tube acts as a rotating blade.

[0012] More preferably, the housing is provided with an arc-shaped protrusion, the arc-shaped protrusion having a groove for slidingly connecting the straight rack, and a protrusion fixed in the groove;

[0013] One side of the rack has a toothed structure, and the other side of the rack has a guide groove that slides to connect with the protrusion. The lower end of the guide groove is open.

[0014] It facilitates the achievement of smooth longitudinal movement.

[0015] More preferably, the housing includes a left housing and a right housing arranged on the left and right sides, and the rear ends of the left housing and the right housing are joined together to form the negative pressure connector. The negative pressure connector is provided with an external thread for a threaded nut.

[0016] The connection stability between the left and right housings is improved by using nuts.

[0017] More preferably, the rear end of the inner tube is fitted with a bushing buckle, and the bushing buckle has a through hole for rotatably connecting the inner tube;

[0018] The bushing is provided with adjacent elastic buckles and limiting protrusions, and a sealing ring is sleeved between the elastic buckles and the limiting protrusions;

[0019] The sealing ring is sandwiched between the bushing and the housing.

[0020] This helps ensure airtightness.

[0021] More preferably, the sheath includes a sleeve body and an outer tube fixed inside the sleeve body, with the front end of the outer tube extending out from the front end of the sleeve body;

[0022] The outer tube is rotatably connected to the inner tube;

[0023] The end of the housing is provided with a connecting part that is threaded to the sheath, the connecting part is provided with an external thread, and the sheath is provided with an internal thread that matches the external thread;

[0024] The connecting part has three positioning holes, and ball screws are threaded into the positioning holes. The end of the ball screw is provided with a ball, and the ball extends out of the outer side of the connecting part. The sheath is provided with a limiting groove for embedding the ball, and the limiting groove is spherical.

[0025] This facilitates adjustment of the exposed length of the inner tube's cutting edge.

[0026] More preferably, the outer periphery of the sleeve is provided with mesh-like protrusions to facilitate rotational operation.

[0027] More preferably, the outer side of the housing is provided with a positioning mark structure for marking the position of the ball screw;

[0028] The outer side of the sheath is provided with an alignment member, which is located around the periphery of the limiting groove;

[0029] The housing includes a left housing and a right housing that are detachably connected, and the three positioning holes are all formed on the left housing or the right housing.

[0030] This allows for a clear and intuitive understanding of the relative rotation angle between the sheath and the shell, enabling adjustment of the exposed depth of the inner tube's cutting edge.

[0031] More preferably, the outer tube has a forward-extending extension at the end away from the housing. The extension is an arc-shaped structure with an opening facing downwards. The extension extends beyond the inner tube and partially covers the inner tube.

[0032] When cutting fat, inserting the extension into the fat can fix the fat in place.

[0033] As one embodiment, the inner tube is connected to a gear body via a one-way bearing. One side of the outer wall of the gear body is provided with gear teeth, and the other side of the gear body is provided with a bushing sleeve fitted around the one-way bearing. The outer diameter of the gear teeth is smaller than the outer diameter of the bushing.

[0034] The gear teeth mesh with the rack;

[0035] At least two bushings are also installed between the inner tube and the shell.

[0036] This facilitates unidirectional rotation of the inner tube and ensures proper layout of the internal space.

[0037] More preferably, a return spring is installed between the other end of the rack and the housing;

[0038] A locking mechanism for locking the inner tube is installed inside the housing;

[0039] The locking mechanism includes a limiting screw, and the limiting screw is installed at one end of the pull-out member adjacent to the return spring;

[0040] The locking mechanism also includes a spoon-shaped hook, which is rotatably mounted in the housing via a pivot. The spoon-shaped hook includes an arc-shaped portion and an inclined guide portion connected in sequence, and the inclined guide portion has a through hole passing through the pivot.

[0041] The pivot is located on the side of the inner tube adjacent to the exposed housing of the pull-out component.

[0042] Since the limit screw is installed on the pull-out part, when the pull-out part is reset under the action of spring force, the limit screw will slowly move on the inclined guide part, causing the spoon-shaped hook to flip. When it is retracted into place, it will block the inner tube and the inner tube will stop rotating.

[0043] As an alternative, a transmission gear is rotatably connected inside the housing via a bearing;

[0044] A driven gear is fixed to the outside of the inner tube;

[0045] The transmission gear includes a first meshing part that meshes with the driven gear and a second meshing part that meshes with the spur rack;

[0046] The number of teeth of the driven gear is less than the number of teeth of the first meshing part, but greater than the number of teeth of the second meshing part;

[0047] The outer diameter of the driven gear is smaller than the outer diameter of the first meshing part, but larger than the outer diameter of the second meshing part.

[0048] In terms of transmission, a transmission gear is added between the spur rack and the driven gear to increase the movement speed of the inner tube, thereby cutting the fat more quickly. Attached Figure Description

[0049] Figure 1 This is a partial structural schematic diagram of a specific embodiment 1 of the present invention;

[0050] Figure 2 This is a schematic diagram of a specific embodiment 1 of the present invention;

[0051] Figure 3 This is a partial structural schematic diagram of a specific embodiment 1 of the present invention;

[0052] Figure 4 This is an exploded view of a specific embodiment 2 of the present invention;

[0053] Figure 5 This is a schematic diagram of a specific embodiment 2 of the present invention;

[0054] Figure 6 This is a partial structural schematic diagram of a specific embodiment 2 of the present invention;

[0055] Figure 7This is a partial structural diagram of a specific embodiment 2 of the present invention.

[0056] Figure 8 This is an exploded view of specific embodiment 3 of the present invention;

[0057] Figure 9 This is a partial structural schematic diagram of specific embodiment 3 of the present invention;

[0058] Figure 10 This is a partial structural schematic diagram of specific embodiment 3 of the present invention;

[0059] Figure 11 This is a partial structural diagram of the outer tube in specific embodiment 4 of the present invention.

[0060] Wherein: 1 is the housing, 2 is the sheath, 3 is the inner tube, 4 is the pull-out part, 5 is the one-way bearing, 6 is the gear body, 7 is the return spring, 8 is the limit screw, 9 is the spoon-shaped hook, 10 is the bushing buckle, 12 is the ball screw, 13 is the bearing, 14 is the first bushing buckle, 15 is the second bushing buckle, 16 is the transmission gear, 17 is the driven gear, and 18 is the extension. Detailed Implementation

[0061] The present invention will now be further described with reference to the accompanying drawings.

[0062] See Figures 1 to 3 Specific embodiment 1: A ring-type retroperitoneal fat removal device includes a housing 1 for gripping, with a sheath 2 detachably connected to the front end of the housing 1 and a negative pressure connector at the rear end; it also includes a rotatable inner tube 3 disposed within the sheath 2 and the housing 1, the front end of the inner tube 3 being a cutting edge, and the rear end of the inner tube 3 being connected to the negative pressure connector; it also includes a pull-out component 4, which includes a ring and a straight rack connected in sequence, the ring being located outside the housing 1, the pull-out component 4 being slidably connected to the housing 1, and the sliding direction of the pull-out component 4 being perpendicular to the rotation center line of the inner tube 3; the pull-out component 4 is connected to the inner tube 3 via a transmission mechanism. The negative pressure connector is connected to the suction tube of a negative pressure suction device.

[0063] The specific details of the transmission mechanism are as follows:

[0064] The inner tube 3 is connected to a gear body 6 via a one-way bearing 5. One side of the outer wall of the gear body 6 has gear teeth, and the other side of the gear body 6 has a bushing fitted around the one-way bearing 5. The outer diameter of the gear teeth is smaller than the outer diameter of the bushing. The gear teeth mesh with a spur rack. At least two bushings are also installed between the inner tube 3 and the housing 1. This facilitates unidirectional rotation of the inner tube 3 and ensures the layout of the space within the housing 1. From the side adjacent to the cutting edge to the side furthest from the cutting edge, the inner tube 3 is sequentially fitted with a first bushing, a second bushing, and the one-way bearing 5. The inner tube 3, the first bushing, and the second bushing are rotatably mounted. The first bushing and the second bushing are clamped and fixed by the housing.

[0065] A return spring 7 is installed between the other end of the rack and the housing 1; a locking mechanism for locking the inner tube 3 is installed inside the housing 1; the locking mechanism includes a limit screw 8, and the limit screw 8 is installed at one end of the pull-out piece 4 adjacent to the return spring 7; the locking mechanism also includes a spoon-shaped hook 9, which is rotatably installed inside the housing 1 via a rotating shaft. The spoon-shaped hook 9 includes an arc-shaped part and an inclined guide part connected in sequence, and the inclined guide part has a through hole passing through the rotating shaft; the rotating shaft is located on the side of the inner tube adjacent to the pull-out piece 4 that protrudes from the housing 1. Since the limit screw 8 is installed on the pull-out piece 4, when the pull-out piece 4 is reset under the action of the spring force, the limit screw 8 will slowly move on the inclined guide part, causing the spoon-shaped hook 9 to flip. When it retracts to the position, it abuts against the inner tube 3, and the inner tube 3 stops rotating.

[0066] This device only requires inserting the sheath 2 and inner tube 3 into the surgical incision to cut the fat within the incision and then remove it using negative pressure suction. It eliminates the need for an extended incision, allowing for minimally invasive fat removal. It quickly and safely establishes the retroperitoneal cavity, shortening surgical time and reducing various risks to the patient. The device achieves rotation of the inner tube 3 through the reciprocating motion of the pull-pull component 4. The rotation of the blade of the inner tube 3 is used to cut the fat. The rotation and orientation of the inner tube are easily controlled during surgery.

[0067] The housing 1 has an arc-shaped protrusion with a groove for sliding connection of a straight rack. A protrusion is fixed inside the groove. One side of the rack has a toothed structure, and the other side has a guide groove for sliding connection of the protrusion. The lower end of the guide groove is open. This facilitates smooth longitudinal movement.

[0068] The housing 1 includes a left housing and a right housing arranged on the left and right sides. The rear ends of the left housing and the right housing are joined together to form a negative pressure connector. The negative pressure connector has an external thread for a threaded nut. The nut improves the connection stability between the left housing and the right housing.

[0069] The rear end of the inner tube 3 is fitted with a bushing buckle 10, and the bushing buckle 10 has a through hole for rotatably connecting the inner tube 3; the bushing buckle has adjacent elastic buckles and limiting protrusions, and a sealing ring is fitted between the elastic buckles and the limiting protrusions; the sealing ring is sandwiched between the bushing buckle 10 and the housing 1. This ensures airtightness.

[0070] The sleeve 2 includes a sleeve body and an outer tube fixed inside the sleeve body, with the front end of the outer tube extending beyond the front end of the sleeve body. The outer tube is rotatably connected to the inner tube 3. The end of the housing 1 has a threaded connection part for the sleeve 2, with external threads on the connection part and internal threads matching the external threads on the sleeve 2. Three positioning holes are provided on the connection part, with ball screws 12 threaded into the positioning holes. The ends of the ball screws have balls extending out of the outer side of the connection part. The sleeve 2 has a limiting groove for embedding the balls, and the limiting groove is spherical. This facilitates the adjustment of the exposed length of the cutting edge of the inner tube 3. The outer periphery of the sleeve body has a grid-like protrusion for easy rotation. The outer side of the housing 1 has a positioning mark structure for marking the position of the ball screws. The outer side of the sleeve 2 has an alignment member located outside the limiting groove. The housing 1 includes a detachably connected left housing and a right housing, with the three positioning holes all located on either the left or right housing. This allows for a direct visual understanding of the relative rotation angle between the sleeve 2 and the housing 1, and adjustment of the exposed depth of the cutting edge of the inner tube 3. The alignment element can be a strip-shaped protrusion with its length direction being front-to-back. The positioning mark structure can be three strip-shaped protrusions arranged circumferentially with their length direction being front-to-back.

[0071] See Figures 4 to 7 Specific embodiment 2, a ring-type retroperitoneal fat removal device, includes a housing 1 for gripping, a sheath 2 detachably connected to the front end of the housing 1, and a negative pressure connector at the rear end of the housing 1; it also includes a rotatable inner tube 3 disposed within the sheath 2 and the housing 1, the front end of the inner tube 3 being a cutting edge, and the rear end of the inner tube 3 being connected to the negative pressure connector; it also includes a pull-out component 4, which includes a ring and a straight rack connected in sequence, the ring being located outside the housing 1, the pull-out component 4 being slidably connected to the housing 1, and the sliding direction of the pull-out component 4 being perpendicular to the rotation center line of the inner tube 3; the pull-out component 4 is connected to the inner tube 3 via a transmission mechanism.

[0072] The housing is rotatably connected to the inner tube via bearing 13.

[0073] A transmission gear 16 is rotatably connected to the housing 1 via bearings, and a driven gear is fixed to the outside of the inner tube. The transmission gear 16 includes a first meshing part that engages with the driven gear 17 and a second meshing part that engages with a spur rack. The number of teeth on the driven gear 17 is less than the number of teeth on the first meshing part but greater than the number of teeth on the second meshing part. The outer diameter of the driven gear 17 is less than the outer diameter of the first meshing part but greater than the outer diameter of the second meshing part. In terms of transmission, the addition of the transmission gear 16 between the spur rack and the driven gear 17 increases the movement speed of the inner tube 3, thereby cutting fat more quickly. One end of the spur rack is connected to the finger ring, and a return spring 7 is installed between the other end and the housing 1.

[0074] See Figures 8 to 10Specific embodiment 3, a ring-type retroperitoneal fat removal device, includes a housing 1 for gripping, a sheath 2 detachably connected to the front end of the housing 1, and a negative pressure connector at the rear end of the housing 1; it also includes a rotatable inner tube 3 disposed within the sheath 2 and the housing 1, the front end of the inner tube 3 being a cutting edge, and the rear end of the inner tube 3 being connected to the negative pressure connector; it also includes a pull-out component 4, which includes a ring and a straight rack connected in sequence, the ring being located outside the housing 1, the pull-out component 4 being slidably connected to the housing 1, and the sliding direction of the pull-out component 4 being perpendicular to the rotation center line of the inner tube 3; the pull-out component 4 is connected to the inner tube 3 via a transmission mechanism.

[0075] The inner tube 3 is interference-fitted with a first bushing buckle 14 and a second bushing buckle 15. The first bushing buckle 14 is rotatably connected to the first bushing that is clamped and fixed inside the housing 1. The first bushing buckle is provided with an elastic buckle and a limiting protrusion to limit the first bushing. The first bushing is located between the elastic buckle and the limiting protrusion.

[0076] The second bushing buckle 15 is rotatably connected to the second bushing that is clamped and fixed inside the housing 1. The second bushing buckle is provided with an elastic snap that limits the second bushing and a toothed structure that engages with a straight rack. The second bushing is located between the elastic snap and the toothed structure.

[0077] See Figure 11 In specific embodiment 4, based on specific embodiments 1, 2, or 3, the end of the outer tube away from the shell has a forward-extending extension 18. The extension 18 is an arc-shaped structure with an opening facing downwards, extending beyond the inner tube and partially covering it. When cutting fat, the extension 18 is inserted into the fat, thereby fixing it in place. The central angle of the extension is greater than 90° and less than 180°.

[0078] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A ring-type pull-out retroperitoneal fat removal device, comprising a housing for gripping, characterized in that, The front end of the housing is detachably connected to a protective sleeve, and the rear end of the housing is provided with a negative pressure connector; It also includes a rotatable inner tube disposed within the sheath and the housing, the front end of the inner tube being a cutting edge, and the rear end of the inner tube being connected to the negative pressure connector. It also includes a pull-out component, which includes a finger ring and a straight rack connected in sequence. The finger ring is located on the outside of the housing. The pull-out component is slidably connected to the housing, and the sliding direction of the pull-out component is perpendicular to the rotation center line of the inner tube. The pull-out component is connected to the inner tube via a transmission mechanism; The inner tube is connected to a gear mechanism via a transmission mechanism, and the spur rack meshes with the gear teeth of the gear mechanism; The housing is provided with an arc-shaped protrusion, and the arc-shaped protrusion has a groove for sliding connection of the straight rack, and a protrusion is fixed in the groove; One side of the rack has a toothed structure, and the other side of the rack has a guide groove that slides to connect with the protrusion. The lower end of the guide groove is open.

2. The ring-pulling retroperitoneal fat removal device according to claim 1, characterized in that: The housing includes a left housing and a right housing arranged on the left and right sides. The rear ends of the left housing and the right housing are joined together to form the negative pressure connector. The negative pressure connector is provided with an external thread for a threaded nut.

3. The ring-pulling retroperitoneal fat removal device according to claim 1, characterized in that: The rear end of the inner tube is fitted with a bushing buckle, and the bushing buckle has a through hole for rotating connection to the inner tube. The bushing is provided with adjacent elastic buckles and limiting protrusions, and a sealing ring is sleeved between the elastic buckles and the limiting protrusions; The sealing ring is sandwiched between the bushing and the housing.

4. The ring-pulling retroperitoneal fat removal device according to claim 1, characterized in that: The sheath includes a sleeve body and an outer tube fixed inside the sleeve body, with the front end of the outer tube extending out from the front end of the sleeve body; The outer tube is rotatably connected to the inner tube; The end of the housing is provided with a connecting part that is threaded to the sheath, the connecting part is provided with an external thread, and the sheath is provided with an internal thread that matches the external thread; The connecting part has three positioning holes, and ball screws are threaded into the positioning holes. The end of the ball screw is provided with a ball, and the ball extends out of the outer side of the connecting part. The sheath is provided with a limiting groove for embedding the ball, and the limiting groove is spherical.

5. The ring-pulling retroperitoneal fat removal device according to claim 4, characterized in that: The outer side of the housing is provided with a positioning mark structure for marking the position of the ball screw; The outer side of the sheath is provided with an alignment member, which is located around the periphery of the limiting groove; The housing includes a left housing and a right housing that are detachably connected, and the three positioning holes are all formed on the left housing or the right housing.

6. The ring-pulling retroperitoneal fat removal device according to claim 1, characterized in that: The outer tube has a forward-extending extension at its end away from the housing. The extension is an arc-shaped structure with an opening facing downwards. The extension extends beyond the inner tube and partially covers the inner tube.

7. The ring-type retroperitoneal fat removal device according to any one of claims 1 to 6, characterized in that: The inner tube is connected to the gear body via a one-way bearing. One side of the outer wall of the gear body is provided with gear teeth, and the other side of the gear body is provided with a bushing sleeve fitted around the one-way bearing. The outer diameter of the gear teeth is smaller than the outer diameter of the bushing. The gear teeth mesh with the rack; At least two bushings are also installed between the inner tube and the shell.

8. The ring-pulling retroperitoneal fat removal device according to claim 7, characterized in that: A return spring is installed between the other end of the rack and the housing. A locking mechanism for locking the inner tube is installed inside the housing; The locking mechanism includes a limiting screw, and the limiting screw is installed at one end of the pull-out member adjacent to the return spring; The locking mechanism also includes a spoon-shaped hook, which is rotatably mounted in the housing via a pivot. The spoon-shaped hook includes an arc-shaped portion and an inclined guide portion connected in sequence, and the inclined guide portion has a through hole passing through the pivot. The pivot is located on the side of the inner tube adjacent to the exposed housing of the pull-out component.

9. The ring-pulling retroperitoneal fat removal device according to any one of claims 1 to 6, characterized in that: The housing is rotatably connected to a transmission gear via a bearing. A driven gear is fixed to the outside of the inner tube; The transmission gear includes a first meshing part that meshes with the driven gear and a second meshing part that meshes with the spur rack; The number of teeth of the driven gear is less than the number of teeth of the first meshing part, but greater than the number of teeth of the second meshing part; The outer diameter of the driven gear is smaller than the outer diameter of the first meshing part, but larger than the outer diameter of the second meshing part.

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