Retroperitoneal fat removal apparatus

Abstract

The present application relates to the field of medical devices. The retroperitoneal fat removal device comprises a cutting knife, which is a hollow tubular structure; further comprising a shell, which is rotationally connected with the cutting knife, one end of the shell is provided with a knife sheath, the cutting knife is rotationally arranged in the knife sheath, and the cutting edge of the cutting knife can extend out of the knife sheath; the other end of the shell is provided with a negative pressure connector, which is in conductive connection with the inner cavity of the hollow tubular structure; further comprising a driving member capable of linear reciprocating motion, which is in sliding connection with the shell and in transmission connection with the cutting knife, and the driving member drives the cutting knife to rotate with the center axis of the hollow tubular structure as the rotation center line. After the knife sheath and the cutting knife are inserted into the surgical incision, the fat in the incision can be cut and removed by negative pressure suction. The incision does not need to be extended, and the fat is removed minimally invasively. The retroperitoneal cavity space is quickly and safely established, the operation time is shortened, and the risks of the patient are reduced.

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] In view of this, how to quickly remove retroperitoneal fat is a major problem that urgently needs to be solved. At present, there is a lack of equipment that can achieve minimally invasive surgery while quickly and conveniently creating a better retroperitoneal cavity. Summary of the Invention

[0005] In view of the problems existing in the prior art, the present invention provides a 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 retroperitoneal fat removal device, characterized in that it includes a cutting blade, wherein the cutting blade is a hollow tubular structure;

[0007] It also includes a housing, which is rotatably connected to the cutting blade. A blade sleeve is installed at one end of the housing, and the cutting blade is rotatably disposed inside the blade sleeve, with the cutting edge of the cutting blade extending out of the blade sleeve.

[0008] A negative pressure connector is installed at the other end of the shell, and the negative pressure connector is connected to the inner cavity of the hollow tubular structure.

[0009] It also includes a drive component capable of linear reciprocating motion, the drive component being slidably connected to the housing and being drively connected to the cutting blade, the drive component driving the cutting blade to rotate around the central axis of the hollow tubular structure as the rotation center line.

[0010] This device only requires inserting the scalpel sheath and cutting blade into the surgical incision to cut the fat within the incision, which is then removed using negative pressure suction. It eliminates the need for extended incisions, 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] More preferably, the end of the housing is provided with a connecting part that is threaded to the blade sheath. The connecting part has three positioning holes. A ball screw is threaded into the positioning holes. The end of the ball screw is provided with a ball. The ball extends out of the outer side of the connecting part.

[0012] The connecting part is provided with an external thread, the blade sleeve is provided with an internal thread that matches the external thread, and the blade sleeve is provided with a limiting groove for embedding the ball, the limiting groove being spherical.

[0013] The outer side of the housing is provided with a positioning mark structure for marking the position of the ball screw;

[0014] The blade sheath has an alignment member on its outer side, which is located around the limiting groove.

[0015] It allows for easy and intuitive understanding of the relative rotation angle between the blade sheath and the housing, enabling adjustment of the exposed depth of the cutting blade.

[0016] As a preferred embodiment, the housing includes a gripping portion, the drive member is slidably mounted on the gripping portion, and the drive member is partially exposed outside the gripping portion. The drive member is connected to the gripping portion via a return spring.

[0017] The direction of motion of the driving component is parallel to the rotation center line of the cutting blade;

[0018] A drive gear is rotatably connected inside the housing, and a driven gear that meshes with the drive gear is installed on the outer wall of the cutting blade;

[0019] The bottom of the drive gear is provided with a cam structure, which includes a large head and a small head. The outer diameter of the large head is larger than the outer diameter of the small head, and the central axis of the large head coincides with the central axis of the drive gear.

[0020] A transmission rod is slidably connected longitudinally to the drive gear, and the central axis of the transmission rod coincides with the central axis of the small head.

[0021] The drive component is provided with a guide groove that is slidably connected to the transmission rod. The guide groove includes a front limiting part, a guide part, and a rear limiting part connected in sequence. The guide part is inclined to the left or to the right from front to back.

[0022] It facilitates the rotation of the cutting blade through the movement of the drive component.

[0023] More preferably, the distance between the centers of the front limiting portion and the rear limiting portion is equal to twice the distance between the center of the small head and the center of the large head.

[0024] It facilitates the unidirectional rotation of the cutting blade through the reciprocating motion of the drive component.

[0025] As another preferred embodiment, the driving component is a push-pull ring, and the direction of movement of the driving component is perpendicular to the rotation center line of the cutting blade;

[0026] The drive component is equipped with a straight rack;

[0027] The outer wall of the cutting blade is provided with a driven gear that is connected to the rack and pinion drive.

[0028] Facilitates the rotational drive of the cutting blade.

[0029] More preferably, a transmission gear is rotatably connected to the housing via a bearing, the transmission gear including a first meshing part that meshes with the driven gear and a second meshing part that meshes with the spur rack.

[0030] 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;

[0031] 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.

[0032] 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.

[0033] More preferably, the end of the blade sheath has an extension that extends beyond the cutting blade and partially covers it. When cutting fat, the extension can be inserted into the fat to secure it.

[0034] More preferably, one end of the driving member protrudes from the housing, and a return spring is installed between the other end of the driving member and the housing;

[0035] The housing is equipped with a locking mechanism for locking the cutting blade.

[0036] The locking mechanism includes a limiting screw, and the limiting screw is installed at one end of the driving member adjacent to the return spring.

[0037] 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.

[0038] The rotating shaft is located on the side of the cutting blade adjacent to the exposed housing of the drive component;

[0039] When the drive component resets under the action of spring force, the limit screw abuts against the inclined guide part and moves, driving the spoon-shaped hook to abut against the cutting blade, thereby stopping the rotation of the cutting blade.

[0040] Since the limit screw is installed on the drive component, when the drive component 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 retracts to the position, it stops the cutting blade and stops the cutting blade from rotating.

[0041] More preferably, a one-way bearing is sleeved around the cutting blade, and the driven gear is sleeved around the one-way bearing.

[0042] It enables unidirectional rotation of the cutting blade.

[0043] More preferably, a bushing buckle is provided on the cutting blade near the negative pressure connector, and the bushing buckle is provided with an elastic buckle that limits the bushing;

[0044] The outer wall of the bushing is provided with an annular groove, and a sealing ring is embedded in the annular groove. The sealing ring is clamped between the housing and the bushing.

[0045] This facilitates improved sealing performance. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of a specific embodiment 1 of the present invention;

[0047] Figure 2 This is a partial structural schematic diagram of a specific embodiment 1 of the present invention;

[0048] Figure 3 This is a partial structural schematic diagram of a specific embodiment 1 of the present invention;

[0049] Figure 4 This is a schematic diagram of the drive gear in specific embodiment 1 of the present invention;

[0050] Figure 5 This is a schematic diagram of the structure of the driving component in specific embodiment 1 of the present invention;

[0051] Figure 6 This is a schematic diagram of a specific embodiment 2 of the present invention;

[0052] Figure 7 This is an exploded view of a specific embodiment 2 of the present invention;

[0053] Figure 8 This is a schematic diagram of the structure of the ball screw in specific embodiment 2 of the present invention;

[0054] Figure 9 This is a partial structural schematic diagram of a specific embodiment 2 of the present invention;

[0055] Figure 10 This is a partial structural schematic diagram of a specific embodiment 2 of the present invention;

[0056] Figure 11 This is a schematic diagram of the structure of the second bushing buckle in a specific embodiment 2 of the present invention;

[0057] Figure 12 This is a partial structural schematic diagram of a specific embodiment 2 of the present invention;

[0058] Figure 13 This is a schematic diagram of the structure of a specific embodiment 3 of the present invention;

[0059] Figure 14 This is a partial structural schematic diagram of specific embodiment 3 of the present invention;

[0060] Figure 15 This is a partial structural schematic diagram of specific embodiment 3 of the present invention;

[0061] Figure 16 This is a partial structural schematic diagram of specific embodiment 3 of the present invention;

[0062] Figure 17 This is a schematic diagram of the structure at the extension portion of a specific embodiment 3 of the present invention;

[0063] Figure 18 This is a partial structural schematic diagram of specific embodiment 4 of the present invention;

[0064] Figure 19 This is a partial structural schematic diagram of specific embodiment 4 of the present invention.

[0065] Wherein: 1 is the cutting blade, 2 is the blade sheath, 3 is the housing, 4 is the driving component, 5 is the driving gear, 6 is the driven gear, 8 is the cam structure, 9 is the transmission rod, 10 is the ball screw, 11 is the first bushing buckle, 12 is the second bushing buckle, 13 is the H-shoulder, 14 is the sealing ring, 15 is the transmission gear, 16 is the one-way bearing, 17 is the return spring, 18 is the limit screw, 19 is the spoon-shaped hook, 20 is the extension, and 21 is the bushing buckle. Detailed Implementation

[0066] The present invention will now be further described with reference to the accompanying drawings.

[0067] See Figures 1 to 5Specific embodiment 1: A retroperitoneal fat removal device includes a cutting blade 1, which is a hollow tubular structure; it also includes a housing 3, which is rotatably connected to the cutting blade 1. One end of the housing 3 is fitted with a blade sheath 2, and the cutting blade 1 is rotatably disposed within the blade sheath 2, with its cutting edge extending out of the sheath 2; the other end of the housing 3 is fitted with a negative pressure connector, which is connected to the inner cavity of the hollow tubular structure; it also includes a linearly reciprocating drive component 4, which is slidably connected to the housing 3 and drively connected to the cutting blade 1, driving the cutting blade 1 to rotate around the central axis of the hollow tubular structure. This device only requires inserting the blade sheath 2 and the cutting blade 1 into the surgical incision to cut the fat within the incision, which is then removed by negative pressure suction. No need to extend the incision; minimally invasive fat removal. It quickly and safely establishes the retroperitoneal cavity, shortens surgical time, and reduces various risks to the patient. The negative pressure connector is connected to a negative pressure suction device via a suction tube.

[0068] The housing 3 includes a gripping part, and a drive member 4 is slidably mounted on the gripping part, with a portion of the drive member 4 protruding from the gripping part. The drive member 4 is connected to the gripping part via a return spring 17. The direction of movement of the drive member 4 is parallel to the rotation center line of the cutting blade 1. A drive gear 5 is rotatably connected inside the housing 3, and a driven gear 6 meshing with the drive gear 5 is mounted on the outer wall of the cutting blade 1. A cam structure 8 is provided at the bottom of the drive gear 5, which includes a large head and a small head. The outer diameter of the large head is larger than that of the small head, and the central axis of the large head coincides with the central axis of the drive gear 5. A transmission rod 9 is slidably connected longitudinally to the drive gear 5, and the central axis of the transmission rod 9 coincides with the central axis of the small head. The drive member 4 is provided with a guide groove slidably connected to the transmission rod 9. The guide groove includes a front limiting part, a guide part, and a rear limiting part connected in sequence. The guide part is inclined to the left or right from front to back. This facilitates the rotation of the cutting blade 1 by the movement of the drive member 4. The distance between the centers of the front limiting part and the rear limiting part is equal to twice the distance between the center of the small head and the center of the large head. This facilitates the unidirectional rotation of the cutting blade via the reciprocating motion of the drive component 4.

[0069] The cross-section of the transmission rod is circular.

[0070] The front end of the housing 3 is fitted with a blade sheath 2.

[0071] The guide groove slopes to the right from back to front;

[0072] When the drive component is in its initial state, the transmission rod is located at the rear limit part of the guide groove, and the small head of the cam structure faces to the left;

[0073] Press the drive component, the drive component moves backward, the cam structure rotates 180° (the small head rotates backward from left to right and then forward), and the drive component moves backward to its limit position.

[0074] When the drive component retracts to its limit position, the transmission rod is located at the front limit part of the guide groove, and the small head of the cam structure faces to the right.

[0075] Release the drive component. Under the force of the return spring, the drive component moves forward, and the cam structure rotates 180° (the small head rotates forward from right to left and then backward). The drive component moves forward to the initial state.

[0076] In this specific embodiment, the gripper allows for convenient control of the cutting blade's rotation and adjustment of its direction and position during surgery. This specific embodiment achieves unidirectional rotation of the driven gear through the reciprocating motion of the drive component 4, thereby enabling unidirectional rotation of the cutting blade.

[0077] See Figures 6 to 12 Specific embodiment 2: The retroperitoneal fat removal device includes a cutting blade 1, which is a hollow tubular structure; it also includes a housing 3, which is rotatably connected to the cutting blade 1. One end of the housing 3 is equipped with a blade sheath 2, and the cutting blade 1 is rotatably disposed within the blade sheath 2, with the cutting edge of the cutting blade 1 extending out of the blade sheath 2; the other end of the housing 3 is equipped with a negative pressure connector, which is connected to the inner cavity of the hollow tubular structure; it also includes a linear reciprocating drive 4, which is slidably connected to the housing 3 and is drively connected to the cutting blade 1, driving the cutting blade 1 to rotate around the central axis of the hollow tubular structure. This device only requires inserting the blade sheath 2 and the cutting blade 1 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, shortens the operation time, and reduces various risks for the patient.

[0078] The end of the housing 3 is provided with a threaded connection to the blade sleeve 2. Three positioning holes are provided on the connection, and ball screws 10 are threaded into the positioning holes. The ends of the ball screws 10 are provided with balls, which extend beyond the outer side of the connection. The connection has external threads, and the blade sleeve 2 has internal threads that match the external threads. The blade sleeve 2 has a spherical groove for embedding the balls. The outer side of the housing 3 has a positioning mark structure for indicating the position of the ball screws. An alignment member is located on the outer side of the blade sleeve 2, outside the alignment groove. This allows for a direct and intuitive understanding of the relative rotation angle between the blade sleeve 2 and the housing 3, and adjustment of the exposed depth of the cutting blade 1.

[0079] The driving component 4 is a push-pull ring, and its movement direction is perpendicular to the rotation center line of the cutting blade. A spur rack is provided on the driving component 4; a driven gear meshing with the spur rack is installed on the outer wall of the cutting blade 1. This facilitates the rotational drive of the cutting blade 1.

[0080] The cutting blade 1 is fitted with a first bushing buckle 11 and a second bushing buckle 12, with the first bushing buckle 11 fitted with the first bushing. The first bushing buckle has an elastic snap and a limiting protrusion to limit the first bushing. The first bushing is located between the elastic snap and the limiting protrusion. The second bushing buckle 12 is fitted with the second bushing. The housing 3 has a support groove for supporting the first bushing and the second bushing. The second bushing buckle has a snap for engaging the second bushing and a driven gear that meshes with a spur rack. Both the first bushing buckle 11 and the second bushing buckle 12 are interference-fitted with the cutting blade.

[0081] An H-sleeve 13 is fitted near the negative pressure connector of the cutting blade 1, and a sealing ring 14 is embedded in the outer wall of the H-sleeve. This increases the sealing performance inside the fat suction device.

[0082] The housing has an arc-shaped protrusion with a groove for sliding connection of a straight rack, and a protrusion is fixed in 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, with the lower end of the guide groove open. This facilitates smooth longitudinal movement.

[0083] The method of use is as follows: with the palm facing the operator, the index finger passes through the push-pull ring and grips the housing 3. By continuously pulling the push-pull ring with the index finger, the blade of the internal cutting blade 1 rotates back and forth to cut fat. Twisting the wrist can also continuously adjust the position of the cutting blade. The internal transmission is mainly achieved by the engagement of the push-pull ring and gears, which drives the inner tube blade to rotate back and forth by pulling the ring.

[0084] The blade sheath 2 protects the blade, and its cooperation with the housing 3 adjusts the blade's extension length. When the ball bearing of one of the three ball screws 10 is engaged in the limiting groove, the blade sheath 2 prevents the cutting tip of the cutting blade 1 from protruding; when the ball bearing of the other ball screw is engaged in the limiting groove, the cutting tip of the cutting blade 1 protrudes by 1mm. This allows for cutting shallower fat deposits. When the ball bearing of the other ball screw is engaged in the limiting groove, the cutting tip of the cutting blade 1 protrudes by 2mm. This allows for cutting deeper fat deposits.

[0085] See Figures 13 to 17 In specific embodiment 3, based on specific embodiment 2, the difference lies in the transmission structure of the cutting blade, as follows:

[0086] The driving component 4 is a push-pull ring, and its movement direction is perpendicular to the rotation center line of the cutting blade. The driving component 4 is equipped with a rack. A driven gear 6, connected to the rack, is mounted on the outer wall of the cutting blade 1. This facilitates the rotational drive of the cutting blade 1. A transmission gear 15 is rotatably connected within the housing 3 via bearings. The transmission gear 15 includes a first meshing part that engages with the driven gear and a second meshing part that engages with the rack. The number of teeth on the driven gear 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 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 15 between the rack and the driven gear increases the movement speed of the inner tube, thereby cutting the fat more quickly.

[0087] A bushing is fitted near the negative pressure connector on the cutting blade, and the bushing has an elastic buckle that limits the bushing's position. The outer wall of the bushing has an annular groove, and a sealing ring is embedded in the annular groove. The sealing ring is clamped between the housing 3 and the bushing, which facilitates improved sealing performance.

[0088] The end of the blade sheath 2 is provided with an extension 20 that extends beyond the cutting blade and partially covers it. When cutting fat, the extension 20 can be inserted into the fat to fix it in place.

[0089] One end of the drive component 4 protrudes from the housing 3, and a return spring 17 is installed between the other end of the drive component 4 and the housing 3. The housing has an arc-shaped protrusion with a sliding groove for a slidably connected rack, and a protrusion is fixed in the groove. One side of the rack has a toothed structure, and the other side has a guide groove for slidingly connecting the protrusion, with the lower end of the guide groove open. This facilitates smooth longitudinal movement.

[0090] The cutting blade 1 is connected to the housing 3 via a bearing, facilitating free rotation of the cutting blade 1. The bearing includes an inner ring, an outer ring, and balls located between the inner and outer rings. The axial length of the inner ring is less than the axial strength of the outer ring. The housing 3 is provided with a limiting groove for embedding the outer ring of the bearing.

[0091] A drive component 4 is slidably connected to the outer shell near the negative pressure connector. The outer wall of the outer shell where the drive component 4 is slidably connected is arc-shaped and convex, allowing for a more comfortable and secure grip on the fat suction device.

[0092] In this specific embodiment 3, compared to specific embodiment 2, a spring is installed, which saves a lot of effort. In terms of transmission, a transmission gear 15 is added between the rack and the driven gear to increase the movement speed of the inner tube, thereby cutting the fat more quickly.

[0093] See Figures 18 to 19In specific embodiment 4, based on specific embodiment 2, a one-way bearing 16 is sleeved around the cutting blade 1, and the driven gear 6 is sleeved around the one-way bearing 16. This enables unidirectional rotation of the cutting blade 1. The cutting head is located at the front end of the cutting blade. A first bushing, a second bushing, and the one-way bearing 16 are sequentially installed on the cutting blade 1 from the side adjacent to the cutting head to the side away from the cutting head. The cutting blade 1 is rotatably configured with respect to the first bushing and the second bushing. The first bushing and the second bushing are clamped and fixed by the housing.

[0094] The housing 3 includes a first housing and a second housing arranged on the left and right sides. The first housing and the second housing are detachably connected and cooperate to form a threaded mounting part. The threaded mounting part has an external thread, which is connected to a nut. This facilitates the assembly of the first housing and the second housing. A locking mechanism for locking the cutting blade 1 is installed inside the housing 3. The locking mechanism includes a limit screw 18, which is installed at one end of the drive member 4 near the return spring 17. The locking mechanism also includes a spoon-shaped hook 19, which is rotatably installed inside the housing 3 via a rotating shaft. The spoon-shaped hook 19 includes an arc-shaped part and an inclined guide part connected in sequence. The inclined guide part has a through hole that passes through the rotating shaft. The rotating shaft is located on the side of the cutting blade 1 near the drive member 4 that protrudes from the housing 3. Since the limit screw 18 is installed on the drive member 4, when the drive member 4 is reset under the action of the spring force, the limit screw 18 will slowly move on the inclined guide part, causing the spoon-shaped hook 19 to flip. When it retracts to its original position, it abuts against the cutting blade 1, and the cutting blade 1 stops rotating.

[0095] The housing has an arc-shaped protrusion with a groove for sliding connection of a straight rack, and a protrusion is fixed in 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, with the lower end of the guide groove open. This facilitates smooth longitudinal movement.

[0096] A bushing is fitted near the negative pressure connector on the cutting blade, and the bushing has an elastic buckle that limits the bushing's position. The outer wall of the bushing has an annular groove, and a sealing ring is embedded in the annular groove. The sealing ring is clamped between the housing 3 and the bushing, which facilitates improved sealing performance.

[0097] A stop function has been added. The internal transmission is equipped with a one-way bearing 16. When the gear is rotated by the push-pull ring, the inner tube will not rotate left or right because of the one-way bearing 16, but will rotate continuously in one direction. The stop function stops the cutting blade 1 from rotating.

[0098] 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 retroperitoneal fat removal device, characterized in that, Includes a cutting blade, which is a hollow tubular structure; It also includes a housing, which is rotatably connected to the cutting blade. A blade sleeve is installed at one end of the housing, and the cutting blade is rotatably disposed inside the blade sleeve, with the cutting edge of the cutting blade extending out of the blade sleeve. A negative pressure connector is installed at the other end of the shell, and the negative pressure connector is connected to the inner cavity of the hollow tubular structure. It also includes a driving component capable of linear reciprocating motion, the driving component being slidably connected to the housing and being drively connected to the cutting blade, the driving component driving the cutting blade to rotate about the central axis of the hollow tubular structure as the rotation center line; The housing includes a gripping part, the driving member is slidably mounted on the gripping part, and the driving member is partially exposed outside the gripping part. The driving member is connected to the gripping part by a return spring. The direction of motion of the driving component is parallel to the rotation center line of the cutting blade; A drive gear is rotatably connected inside the housing, and a driven gear that meshes with the drive gear is installed on the outer wall of the cutting blade; The bottom of the drive gear is provided with a cam structure, which includes a large head and a small head. The outer diameter of the large head is larger than the outer diameter of the small head, and the central axis of the large head coincides with the central axis of the drive gear. A transmission rod is slidably connected longitudinally to the drive gear, and the central axis of the transmission rod coincides with the central axis of the small head. The drive component is provided with a guide groove that is slidably connected to the transmission rod. The guide groove includes a front limiting part, a guide part, and a rear limiting part connected in sequence. The guide part is inclined to the left or to the right from front to back.

2. The retroperitoneal fat removal device according to claim 1, characterized in that: The end of the housing is provided with a connecting part that is threaded to the blade sheath. The connecting part has three positioning holes. A ball screw is threaded into the positioning hole. The end of the ball screw is provided with a ball. The ball extends out of the outer side of the connecting part. The connecting part is provided with an external thread, the blade sleeve is provided with an internal thread that matches the external thread, and the blade sleeve is provided with a limiting groove for embedding the ball, the limiting groove being spherical. The outer side of the housing is provided with a positioning mark structure for marking the position of the ball screw; The blade sheath has an alignment member on its outer side, which is located around the limiting groove.

3. The retroperitoneal fat removal device according to claim 1, characterized in that: The distance between the centers of the front limiting portion and the rear limiting portion is equal to twice the distance between the center of the small head and the center of the large head.

4. The retroperitoneal fat removal device according to claim 1, characterized in that: The driving component is a push-pull ring, and the direction of movement of the driving component is perpendicular to the rotation center line of the cutting blade; The drive component is equipped with a straight rack; The outer wall of the cutting blade is provided with a driven gear that is connected to the rack and pinion drive.

5. The retroperitoneal fat removal device according to claim 4, characterized in that: A transmission gear is rotatably connected to the housing via a bearing. 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.

6. The retroperitoneal fat removal device according to claim 1, characterized in that: The end of the blade sheath has an extension that extends beyond the cutting blade and partially covers the cutting blade.

7. The retroperitoneal fat removal device according to claim 4, characterized in that: The cutting blade is fitted with a one-way bearing, and the driven gear is fitted with a one-way bearing.

8. The retroperitoneal fat removal device according to claim 7, characterized in that: One end of the driving component protrudes from the housing, and a return spring is installed between the other end of the driving component and the housing; The housing is equipped with a locking mechanism for locking the cutting blade. The locking mechanism includes a limiting screw, and the limiting screw is installed at one end of the driving 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 rotating shaft is located on the side of the cutting blade adjacent to the exposed housing of the drive component; When the driving component resets under the action of the spring force, the limiting screw abuts against the inclined guide part and moves, causing the spoon-shaped hook to abut against the cutting blade, thereby stopping the rotation of the cutting blade.

9. The retroperitoneal fat removal device according to claim 1, characterized in that: The cutting blade is fitted with a bushing buckle near the negative pressure connector, and the bushing buckle is provided with an elastic buckle that limits the bushing. The outer wall of the bushing is provided with an annular groove, and a sealing ring is embedded in the annular groove. The sealing ring is clamped between the housing and the bushing.

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