Pistol-type retroperitoneal fat removal device

Abstract

The application relates to the field of medical devices. A pistol-type retroperitoneal fat removal device comprises a pistol-shaped shell, the pistol-shaped shell comprising a horizontally arranged main body part and a vertically arranged hand-held part; one end of the main body part is detachably connected with an outer tube, and the other end of the main body part is provided with a negative pressure connector; the device further comprises a rotary knife, the rotary knife is in a hollow tubular structure, the rotary knife is rotatably arranged on the main body part, one end of the rotary knife is in butt joint conduction with the negative pressure connector, the other end of the rotary knife is provided with a blade edge, and the blade edge extends out of the outer tube; the device further comprises a driving piece, the driving piece is in sliding connection with the hand-held part, a return spring is arranged between the driving piece and the hand-held part, the sliding direction of the driving piece and the hand-held part is parallel to the rotary center line direction of the rotary knife; and the driving piece and the rotary knife are in transmission connection through a transmission mechanism. The device only needs to extend the outer tube and the cutting knife into a surgical incision, and then the fat in the incision can be cut and taken out through negative pressure suction.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of medical devices, in particular to a fat removal device. BACKGROUND

[0002] Renal cancer is a common malignant tumor in urology, and its incidence accounts for 2%-3% of adult malignant tumors. Although the incidence of renal cancer is lower than that of bladder cancer and prostate cancer, renal cancer is indeed the malignant tumor with the highest mortality rate in the urinary system. Surgical operation is the preferred treatment method for localized renal cancer, and the surgical approach for renal cancer includes transabdominal and retroperitoneal (translumbar) approaches. The retroperitoneal approach has the advantages of small damage, easy to find the artery during operation, small impact on the recovery of gastrointestinal function, early eating for patients, and rapid postoperative rehabilitation. However, the space in the posterior abdominal cavity is relatively small, and the retroperitoneal fat needs to be removed during the operation to have a better operation space for operation.

[0003] At present, the main way to remove the retroperitoneal fat during the operation is to divide the fat into small pieces by the operator or to remove the retroperitoneal fat by extending the incision. The block removal method is time-consuming and laborious, and the method of removing the retroperitoneal fat by extending the incision causes unnecessary damage to the patient, and is prone to wound pain, delayed healing and other phenomena.

[0004] Therefore, how to quickly remove the retroperitoneal fat is a big problem to be solved, and at present there is a lack of a device that can achieve minimally invasive and quickly and conveniently create a better posterior abdominal cavity space. SUMMARY

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

[0006] In order to achieve the above purpose, the pistol-type retroperitoneal fat removal device provided by the present application comprises a pistol-shaped shell, wherein the pistol-shaped shell comprises a horizontally arranged main body part and a vertically arranged hand-held part;

[0007] One end of the main body part is detachably connected to an outer tube, and the other end of the main body part is provided with a negative pressure connector;

[0008] Further comprising a rotating knife, the rotating knife is in a hollow tubular structure, the rotating knife is rotatably arranged in the main body part, one end of the rotating knife is in butt joint with the negative pressure connector, the other end of the rotating knife is provided with a blade, and the blade extends out of the outer tube;

[0009] Further comprising a driving member, the driving member is in sliding connection with the hand-held part, a return spring is installed between the driving member and the hand-held part, and the sliding direction of the driving member and the hand-held part is parallel to the center line direction of the rotating knife;

[0010] The driving member is in transmission connection with the rotary cutter through a transmission mechanism.

[0011] The transmission mechanism comprises a driving gear, a driven gear and a transmission rod.

[0012] The driving gear is rotatably connected in the pistol-shaped housing, and the driven gear is mounted on the outer wall of the cutting knife and engaged with the driving gear.

[0013] The bottom of the driving gear is provided with a cam structure, which comprises 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 driving gear.

[0014] The transmission rod is connected to the driving gear, and the central axis of the transmission rod coincides with the central axis of the small head.

[0015] The driving member is provided with a guide groove in sliding connection with the transmission rod, the guide groove comprises a front limiting portion, a guide portion and a rear limiting portion connected in sequence, and the guide portion is inclined left or right from front to back.

[0016] The device only needs to extend the outer tube and the cutting knife into the surgical incision, and then cut and remove the fat in the incision under negative pressure. It does not need to extend the incision, and it is minimally invasive to remove fat. It quickly and safely establishes the retroperitoneal space, shortens the operation time and reduces the risk of patients.

[0017] The device realizes the rotary motion of the rotary cutter through the reciprocating motion of the driving member.

[0018] Further preferably, the distance between the centers of the front limiting portion and the rear limiting portion is equal to twice the distance from the center of the small head to the center of the large head.

[0019] It is convenient to realize the one-way rotary motion of the cutter head through the reciprocating motion of the driving member.

[0020] Further preferably, the driving member is provided with a support column adjacent to one side of the hand-held portion, and the reset spring is sleeved on the support column.

[0021] Further preferably, the pistol-shaped housing comprises a left housing and a right housing arranged left and right, and the left housing and the right housing are detachably connected.

[0022] The first shaft sleeve and the second shaft sleeve rotatably connecting the rotary cutter are clamped between the left housing and the right housing.

[0023] The driven gear is mounted between the first shaft sleeve and the second shaft sleeve.

[0024] Further preferably, the left shell and the right shell are clamped with a third shaft sleeve which is rotationally connected with the driving gear;

[0025] The left shell and the right shell are provided with a shaft sleeve limiting groove which is embedded in the third shaft sleeve, and a clearance groove is formed at the lower end of the shaft sleeve limiting groove for avoiding the cam structure, the clearance groove is a semicircular groove which penetrates left and right;

[0026] The lower end of the shaft sleeve limiting groove is connected with an L-shaped guide part, the L-shaped guide part includes a vertical longitudinal part and a horizontal transverse part, and the longitudinal part is arranged above the transverse part;

[0027] A sliding groove is formed on the driving part which slides into the transverse part, and the rear end of the sliding groove is open;

[0028] The driving part is arranged above the sliding groove, and the upper region of the driving part is located between the longitudinal part of the left shell and the longitudinal part of the right shell.

[0029] Further preferably, the outer tube is connected with a sheath;

[0030] The sheath is threadedly connected with the hand gun-shaped shell, and a locking mechanism is arranged between the sheath and the hand gun-shaped shell.

[0031] Further preferably, the hand gun-shaped shell is provided with a connecting piece which connects the main body part and the hand holding part, the connecting piece, the main body part and the hand holding part form a ring structure, and the driving part is partially arranged in the ring structure.

[0032] The finger is limited, and the connecting piece can avoid accidental touch.

[0033] Further preferably, the driving part is provided with an inner recess for embedding the index finger.

[0034] The driving part is convenient to press and move.

[0035] Further preferably, the end of the left shell and the right shell is provided with an external thread, and the external threads of the left shell and the right shell are combined to form the negative pressure interface;

[0036] The external threads of the left shell and the right shell are connected with a nut.

[0037] The nut is fixed after the left shell and the right shell are combined.

[0038] Further preferably, the end of the outer tube away from the main body part is provided with an extension part which extends forward, the extension part is an arc structure which opens downward, the extension part exceeds the rotary knife, and the extension part partially covers the rotary knife.

[0039] When cutting fat, the extension inserted into the fat can fix the fat. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 A partial structure schematic diagram of embodiment 1 of the present application;

[0041] Figure 2 An exploded view of embodiment 1 of the present application;

[0042] Figure 3 A partial structure schematic diagram of embodiment 1 of the present application;

[0043] Figure 4 A partial structure schematic diagram of embodiment 1 of the present application;

[0044] Figure 5 A structure schematic diagram of the driven gear of embodiment 1 of the present application;

[0045] Figure 6 A partial structure schematic diagram of the driven gear of embodiment 1 of the present application;

[0046] Figure 7 A structure schematic diagram of the driving member of embodiment 1 of the present application

[0047] Figure 8 A partial structure schematic diagram of embodiment 2 of the present application;

[0048] Figure 9 A structure schematic diagram of embodiment 2 of the present application in the connected state of the sheath and the outer tube;

[0049] Figure 10 A structure schematic diagram of the glass bead screw of embodiment 2 of the present application;

[0050] Figure 11 A structure schematic diagram of the outer tube of embodiment 3 of the present application;

[0051] Figure 12 A partial structure schematic diagram of embodiment 1 of the present application.

[0052] Wherein: 1 is a pistol-shaped shell, 2 is a driving member, 3 is an outer tube, 4 is a rotary knife, 5 is a first shaft sleeve, 6 is a second shaft sleeve, 7 is a third shaft sleeve, 8 is a driving gear, 9 is a driven gear, 10 is a transmission rod; 11 is a sheath, 12 is a glass bead screw, 13 is a positioning member, 14 is a limiting groove, 16 is a positioning hole; 17 is an inner tube buckle, 18 is a longitudinal part, 19 is a transverse part, 21 is a guide groove; 31 is an extension; 81 is a cam structure, and 82 is a blind hole. DETAILED DESCRIPTION

[0053] The present application will be further described below with reference to the drawings.

[0054] Referring to Figures 1 to 7 , Figure 12 , the specific embodiment 1, the pistol type retroperitoneal fat removal device, including the pistol-shaped shell 1, the pistol-shaped shell 1 includes the transversely arranged main body part and the vertically arranged hand-held part; one end of the main body part is detachably connected to the outer tube 3, and the other end of the main body part is provided with a negative pressure connector.

[0055] It also includes a rotating knife 4, which is in the form of a hollow tubular structure, and is rotatably arranged in the main body part, and one end of the rotating knife 4 is in communication with the negative pressure connector, and the other end of the rotating knife 4 is provided with a blade edge, which extends out of the outer tube 3. An inner tube buckle 17 is mounted between the negative pressure connector and the rotating knife. A through hole for rotating the rotating knife is formed in the center of the inner tube buckle.

[0056] It also includes a driving member 2, which is in sliding connection with the hand-held part, and a return spring is mounted between the driving member 2 and the hand-held part. The side of the driving member 2 adjacent to the hand-held part is provided with a support column, and the return spring is sleeved on the support column. The sliding direction of the driving member 2 and the hand-held part is parallel to the center line direction of the rotating knife 4; the driving member 2 and the rotating knife 4 are in transmission connection through a transmission mechanism.

[0057] The transmission mechanism includes a driving gear 8, a driven gear 9 and a transmission rod 10; the driving gear 8 is rotatably connected in the shell, and the outer wall of the cutting knife is provided with the driven gear 9 engaged with the driving gear 8; the bottom of the driving gear 8 is provided with a cam structure 81, which includes a large head part and a small head part, the outer diameter of the large head part is larger than that of the small head part, and the center axis of the large head part coincides with the center axis of the driving gear 8; the transmission rod 10 is connected to the driving gear 8. The bottom of the driving gear is provided with a blind hole 82 for inserting the transmission rod. The center axis of the transmission rod 10 coincides with the center axis of the small head part; the driving member 2 is provided with a guide groove 21 in sliding connection with the transmission rod 10, the guide groove 21 includes a front limiting part, a guide part and a rear limiting part connected in sequence, and the guide part is inclined leftward or rightward from front to back.

[0058] The front end of the main body part is detachably connected to the outer tube.

[0059] The guide groove is inclined rightward from back to front;

[0060] When the driving member is in the initial state, the transmission rod is located in the rear limiting part of the guide groove, and the small head part of the cam structure faces left;

[0061] Press the driving member, the driving member retreats, the cam structure rotates 180° (the small head part rotates from left to right backward and then rotates forward), and the driving member retreats to the limit position;

[0062] When the driving member retreats to the limit position, the transmission rod is located in the front limiting part of the guide groove, and the small head part of the cam structure faces right;

[0063] Loosen the drive, the drive under the action of the reset spring, the drive forward, cam structure rotates 180° (small head from right to left forward rotation back rotation), the drive forward to the initial state.

[0064] The cross section of the transmission rod is circular.

[0065] The device only needs to extend the outer tube 3 and the cutting knife into the surgical incision, and then cut the fat in the incision, and then take it out by negative pressure. No need to extend the incision, minimally invasive to take out the fat. Quickly and safely establish the retroperitoneal space, shorten the operation time and reduce the risk of patients. The device realizes the rotary motion of the rotary knife 4 through the reciprocating motion of the driving member 2. The negative pressure connector connects the suction tube of the negative pressure suction device.

[0066] The distance between the centers of the front and rear limit parts is equal to twice the distance from the center of the small head to the center of the large head. It is convenient to realize the one-way rotary motion of the knife head by the reciprocating motion of the driving member 2.

[0067] The shell includes left and right left and right shells, which are detachably connected; the first and second shaft sleeves 5 and 6 are clamped between the left and right shells and rotate the rotary knife 4; the driven gear 9 is installed between the first and second shaft sleeves 5 and 6.

[0068] The third shaft sleeve 7 is clamped between the left and right shells and rotates the driving gear 8.

[0069] The left and right shells are provided with a shaft sleeve limiting groove embedded in the third shaft sleeve 7, and the lower end of the shaft sleeve limiting groove is provided with a limiting groove for avoiding the cam structure, which is a semicircular groove penetrating left and right; the lower end of the shaft sleeve limiting groove is connected with an L-shaped guide part, which includes a vertical longitudinal part 18 and a transverse part 19, and the longitudinal part 18 is located above the transverse part 19; the driving member 2 is provided with a sliding groove for sliding into the transverse part, and the rear end of the sliding groove is open; the upper area of the driving member 2 is located between the longitudinal parts of the left and right shells.

[0070] The shell is provided with a connecting piece connecting the main body and the hand-held part, and the connecting piece, the main body and the hand-held part form a ring structure, and the driving member 2 is partially arranged in the ring structure. It is convenient to limit the fingers. Avoiding accidental touch can be realized through the connecting piece.

[0071] The driving member 2 is provided with an inner recess for embedding the index finger. It is convenient to press and move.

[0072] The end of the left and right shells is provided with an external thread, and the external threads of the left and right shells are spliced to form a negative pressure interface; the external threads of the left and right shells are connected with a nut. It is convenient to fix the nut after splicing the left and right shells.

[0073] Referring to Figures 8 to 10 , in specific embodiment 2, based on specific embodiment 1, the outer tube is connected with a sheath; the sheath is threadedly connected with the shell, and a locking mechanism is arranged between the sheath and the shell. The locking mechanism can include a ball screw and a limiting groove. Specifically, an end of the shell is provided with a connecting portion for threadedly connecting the sheath, three positioning holes 16 are formed in the connecting portion, a ball screw 12 is threadedly connected in the positioning holes 16, an end of the ball screw 12 is provided with a ball, the ball extends out of an outer side of the connecting portion; and the three positioning holes are all arranged on the left shell or the right shell; the connecting portion is provided with an external thread, the sheath 11 is provided with an internal thread matched with the external thread, the sheath 11 is provided with a limiting groove 14 in which the ball is embedded, and the limiting groove is in a spherical shape; an outer side of the shell is provided with a positioning mark structure for marking a position of the ball screw; an outer side of the sheath is provided with an alignment piece 13, and the alignment piece 13 is located at an outer periphery of the limiting groove 14. The relative rotation angle between the sheath and the shell can be directly and intuitively obtained, and the exposed depth of the cutting knife can be adjusted. The alignment piece can be a strip-shaped protrusion with a length direction being a front-rear direction. The positioning mark structure can be three strip-shaped protrusions with a length direction being a front-rear direction and arranged in a circumferential direction.

[0074] Referring to Figure 11 , in specific embodiment 3, based on specific embodiment 1, an end of the outer tube away from the main body portion is provided with an extension portion 31 extending forward, the extension portion 31 is an arc-shaped structure with an opening downward, the extension portion 31 exceeds the rotary knife, and the extension portion partially covers the rotary knife. When cutting fat, the extension portion inserted into the fat can fix the fat. A central angle of the extension portion is less than 180° and greater than 90°.

[0075] The above are only preferred embodiments of the present application, and it should be pointed out that, for those skilled in the art, some improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A pistol-type retroperitoneal fat removal device, characterized in that, It includes a pistol-shaped housing, which includes a horizontally arranged main body and a vertically arranged handheld part; One end of the main body is detachably connected to the outer tube, and the other end of the main body is provided with a negative pressure connector; It also includes a rotating blade, which has a hollow tubular structure and is rotatably mounted on the main body. One end of the rotating blade is connected to the negative pressure connector, and the other end of the rotating blade is provided with a cutting edge that extends out of the outer tube. It also includes a driving component, which is slidably connected to the handheld part, and a return spring is installed between the driving component and the handheld part. The sliding direction of the driving component and the handheld part is parallel to the rotation center line direction of the rotating blade. The driving component and the rotating blade are connected by a transmission mechanism. The transmission mechanism includes a driving gear, a driven gear, and a transmission rod; The drive gear is rotatably connected inside the pistol-shaped housing, and the driven gear that meshes with the drive gear is installed on the outer wall of the rotating 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 connected to the drive gear, and the central axis of the transmission rod coincides with the central axis of the small head. The driving 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. The distance between the centers of the front limiting part and the rear limiting part is equal to twice the distance from the center of the small head to the center of the large head; The drive unit has a support post on the side adjacent to the handheld part, and the return spring is sleeved on the support post.

2. The pistol-type retroperitoneal fat removal device according to claim 1, characterized in that: The pistol-shaped housing includes a left housing and a right housing arranged on the left and right sides, and the left housing and the right housing are detachably connected; A first bushing and a second bushing that are rotatably connected to the rotating blade are clamped between the left housing and the right housing; The driven gear is installed between the first bushing and the second bushing.

3. The pistol-type retroperitoneal fat removal device according to claim 2, characterized in that: A third bushing, which is rotatably connected to the drive gear, is sandwiched between the left housing and the right housing. The left housing and the right housing are provided with bushing limiting grooves for embedding the third bushing. The lower end of the bushing limiting groove is provided with a clearance groove for avoiding the cam structure. The clearance groove is a semi-circular groove that runs vertically through the shaft. The lower part of the bushing limiting groove is connected to an L-shaped guide portion, which includes a vertically arranged longitudinal portion and a horizontally arranged transverse portion, with the longitudinal portion located above the transverse portion. The drive component has a groove that slides into the transverse portion, and the rear end of the groove is open; The driving component is located in the area above the slide groove, between the longitudinal portion of the left housing and the longitudinal portion of the right housing.

4. The pistol-type retroperitoneal fat removal device according to claim 2, characterized in that: The outer tube is connected to a protective sleeve; The sheath is threadedly connected to the pistol-shaped housing, and a locking mechanism is provided between the sheath and the pistol-shaped housing.

5. The pistol-type retroperitoneal fat removal device according to claim 1, characterized in that: The pistol-shaped housing is provided with a connecting piece that connects the main body and the handheld part. The connecting piece, the main body, and the handheld part form a ring structure, and the driving component is partially disposed within the ring structure.

6. The pistol-type retroperitoneal fat removal device according to claim 1, characterized in that: The drive component has a recess for embedding the index finger.

7. The pistol-type retroperitoneal fat removal device according to claim 2, characterized in that: The ends of the left and right housings are provided with external threads, and the external threads of the left and right housings are joined together to form the negative pressure connector; The external threads of the left housing and the right housing are connected to the nuts.

8. The pistol-type 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 main body. The extension is an arc-shaped structure with an opening facing downwards. The extension extends beyond the rotating blade and partially covers the rotating blade.

Images