Power tool bit for removing soft tissue

Abstract

The invention relates to the technical field of medical instruments, in particular to a power tool bit for removing soft tissue. Comprising a power connector connected to a power handle, a transmission rod assembly fixedly connected to the power connector and a tool bit arranged at the front end of the transmission rod assembly, and the tool bit comprises a tool apron and a mesh basket fixedly connected to the tool apron; the transmission rod assembly comprises an outer sleeve, an inner pipe and a power rod assembly, wherein the inner pipe is arranged in an inner cavity of the outer sleeve and can move in the axial direction, and the power rod assembly is arranged in an inner cavity of the inner pipe and can rotate. The rear end of the power rod assembly is connected with the power connector, the front end of the power rod assembly is connected with the tool apron through the flexible connecting device, the front end of the inner pipe is connected with the flexible connecting device, and the rear end of the inner pipe is connected with the operating handle. The nucleus pulposus tool bit is connected with a power device for use, and can efficiently stir and remove soft tissues such as nucleus pulposus; the angle of the head end can be adjusted, a larger working area is obtained under the condition that the angle of the instrument is not changed, and peripheral tissue is prevented from being accidentally injured. The device is suitable for rapidly, efficiently and safely removing nucleus pulposus tissues in minimally invasive endoscopic surgery.

Description

Technical Field

[0001] The present invention relates to the technical field of medical instruments, and in particular to a power cutter head for removing soft tissue. Background Art

[0002] The nucleus pulposus is part of the intervertebral disc structure and is located between the two cartilage plates and the annulus fibrosus. The elastic jelly substance composed of a criss-crossed fibrous mesh structure, namely chondrocytes and a proteoglycan mucoid matrix, is a milky white, translucent colloid and is elastic. In orthopedic surgery, it is often necessary to process soft tissues such as the nucleus pulposus. The traditional method of processing is to use pliers to clamp them out, which is inefficient and may cause damage to other tissues during the clamping process. For example, Chinese patent 2024202033051 discloses "A nucleus pulposus forceps for percutaneous endoscopic surgery", and the authorization announcement number is CN221308319U. After the forceps head is used to clamp the tissue, the tissue can be cut with a cutting knife. Another Chinese patent 202010951788X discloses "a nucleus pulposus forceps system with bite, suction, and lighting functions in one", and the authorization announcement number is CN111887938B. The system integrates bite, suction, lighting and other functions. These clamp-type surgical instruments have high requirements for operators when used. It is difficult to position the clamp head when clamping the nucleus pulposus, which can easily cause damage to other surrounding tissues. Another Chinese patent 2020210584772 discloses a "nucleus pulposus knife", and the authorization announcement number is CN213156208U. The nucleus pulposus knife includes a connecting handle, a knife back and a blade connected in sequence from top to bottom. The knife back is curved in an arc on the vertical plane. When used, the blade is used to surround the outside of the nucleus pulposus to cut the nucleus pulposus and its annulus fibrosus from the surrounding environment. The cutting angle of the nucleus pulposus knife is rotated to quickly cut the nucleus pulposus and its annulus fibrosus from the surrounding environment. The nucleus pulposus and its annulus fibrosus are completely cut off, and then the nucleus pulposus is shoveled up by the curved blade and the curved knife back. The nucleus pulposus is accommodated and supported by the curved knife back and taken out of the body with the knife back. This nucleus pulposus knife is completely operated by manual visual operation when in use, requiring a larger wound and surgical field of view, and cannot be used for minimally invasive endoscopic surgery. In addition, another defect of these nucleus pulposus forceps and nucleus pulposus knives is that the angle of the knife head cannot be changed, and the working area is limited when used in minimally invasive surgery. Summary of the invention

[0003] The purpose of the present invention is to provide a power knife head for removing soft tissue of the nucleus pulposus that has a reasonable structure, is easy to use, has an adjustable knife head angle, and has a wide surgical working area, and is used to quickly, efficiently, and safely remove the nucleus pulposus tissue during minimally invasive endoscopic surgery.

[0004] To achieve the above object, the present invention adopts the following technical solution:

[0005] The power cutter head for removing soft tissue described in the present invention comprises a power joint connected to a power handle, a transmission rod assembly fixedly connected to the power joint, and a cutter head arranged at the front end of the transmission rod assembly, wherein the cutter head comprises a cutter seat and a net basket fixedly connected to the cutter seat, wherein the net basket is a sphere woven from elastic wire; the transmission rod assembly comprises an outer sleeve, an inner tube arranged in the inner cavity of the outer sleeve and axially movable, and a power rod assembly arranged in the inner cavity of the inner tube and rotatable; the rear end of the power rod assembly is connected to the power joint, and the front end is connected to the cutter seat via a flexible connecting device, the front end of the inner tube is connected to the flexible connecting device, and the rear end is connected to the operating handle.

[0006] Through this solution, the nucleus pulposus cutter head is connected to a power device and can efficiently remove soft tissues such as the nucleus pulposus; the angle of the head end can be adjusted to obtain a larger working area without changing the angle of the instrument, thereby avoiding accidental injury to surrounding tissues.

[0007] Preferably, the flexible connection device includes a steel wire rope with a front end fixedly connected to the knife seat and a hinged sleeve rotatably mounted on the knife seat; the rear end of the steel wire rope is connected to the power rod assembly, and the front end is fixedly connected to the knife seat; the front end of the hinged sleeve is mounted on the knife seat through a bearing, and the rear end of the hinged sleeve is provided with a hinged hanging plate, and the hinged hanging plate is provided with a first hinge axis and a second hinge axis, and the front end of the inner tube is fixedly installed with an inner tube hanging ear adapted to the hinged hanging plate, and the inner tube hanging ear is installed on the first hinge axis; a push-pull rod is fixedly connected to the side wall of the front end of the outer sleeve, and the push-pull rod is installed on the second hinge axis.

[0008] Through this solution, the working angle of the head end can be adjusted to obtain a larger working area.

[0009] Preferably, the operating handle is fixedly connected to the rear end of the outer sleeve, and a through hole is provided on the operating handle, in which a sliding sleeve is slidably installed, and the front end of the sliding sleeve is fixedly connected to the inner tube and coaxially arranged with the inner tube; the power rod assembly passes through the through hole and is fixedly connected to the power joint; a spiral bevel groove and an axially arranged straight groove are provided on the outer wall of the sliding sleeve, and a limit rod adapted to the bevel groove and a bump ball adapted to the straight groove are provided on the inner wall of the through hole.

[0010] Through this solution, the operating handle can drive the outer tube and the inner tube to move relative to each other, thereby driving the head end to adjust the working angle.

[0011] Preferably, the rear end of the steel wire rope is fixedly connected to a steel wire rope joint, and the rear end of the steel wire rope joint is hinged to the front end of the power rod assembly.

[0012] Through this solution, the angle of the wire rope can be adjusted along with the head end without affecting the transmission of the rotational power of the power joint to the head end.

[0013] Preferably, the front end of the limit rod is a hemisphere or cylinder adapted to the inclined groove, and the rear end has an external thread. The limit rod is installed on the side wall of the operating handle through the thread; the ball is embedded in the inner wall of the through hole.

[0014] Through this solution, the limiting rod can be rotated by a tool outside the operating handle to adjust the tightness of the fit between the front end of the limiting rod and the inclined groove.

[0015] Preferably, the net basket is planted with bristles.

[0016] Through this solution, the removal efficiency of soft tissues such as the nucleus pulposus can be improved.

[0017] Compared with the prior art, the invention has the following beneficial effects: the nucleus pulposus cutter head is connected to a power device and can efficiently remove soft tissues such as the nucleus pulposus; the angle of the head end can be adjusted, so that a larger working area can be obtained without changing the angle of the instrument, thereby avoiding accidental injury to surrounding tissues. It is suitable for quickly, efficiently and safely removing nucleus pulposus tissue in minimally invasive endoscopic surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of an embodiment of the present invention;

[0019] Figure 2 for Figure 1 A schematic diagram of the assembly structure of an embodiment;

[0020] Figure 3 Schematic diagram of the three-dimensional structure of the cutter head;

[0021] Figure 4 It is a schematic diagram of the assembly structure of the articulated sleeve and the inner tube;

[0022] Figure 5 It is a schematic diagram of the assembly structure of the articulated sleeve and the outer sleeve;

[0023] Figure 6 It is a schematic diagram of the assembly structure of the operating handle.

[0024] Figure 7 It is a schematic diagram of the three-dimensional structure of the sleeve. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] like Figure 1As shown, a power cutter head for removing soft tissue of the present invention comprises a power connector 1 connected to a power handle, a transmission rod assembly 2 fixedly connected to the power connector 1, and a cutter head 3 arranged at the front end of the transmission rod assembly 2. The power connector 1 is used to connect a universal power handle, and the structure of the power handle is a prior art well known to those skilled in the art, and is not shown in the accompanying drawings. A driving motor is installed in the power handle, and the power of the driving motor is transmitted to the transmission rod assembly 2 through the locking structure at the end of the power connector 1, driving the cutter head 3 to rotate.

[0027] like Figure 3 As shown, the cutter head 3 includes a cutter seat 31 and a mesh basket 32 ​​fixedly connected to the cutter seat 31; the mesh basket 32 ​​is a sphere woven from elastic wires. When the mesh basket 32 ​​rotates, the elastic wires such as steel wires used to weave the mesh basket can stir and remove soft tissues such as the nucleus pulposus. In addition, bristles are planted on the mesh basket 32. The bristles are soft and have a certain degree of elasticity, which can effectively expand the working range of the cutter head 3 without causing damage to the surrounding bone tissue.

[0028] like Figure 2 As shown, the transmission rod assembly 2 includes an outer sleeve 21, an inner tube 22 disposed in the inner cavity of the outer sleeve 21 and axially movable, and a power rod assembly 23 disposed in the inner cavity of the inner tube 22 and rotatable. The outer sleeve 21 and the inner tube 22 are both slender circular tubular structures. The inner tube 22 has a small diameter so that it can be installed in the outer sleeve 21 and has a gap that can move relatively. The rear end of the power rod assembly 23 is connected to the power joint 1, and the front end is connected to the knife seat 31 through a flexible connection device. The front end of the inner tube 22 is connected to the flexible connection device, and the rear end is connected to the operating handle 4. The rear end of the power rod assembly 23 obtains the power of the driving motor through the power joint 1, and transmits the power to the knife seat 31 through the flexible connection device at the front end, and drives the knife head 3 to rotate through the knife seat 31.

[0029] like Figure 2 , Figure 4 As shown, the flexible connection device includes a steel wire rope 5 whose front end is fixedly connected to the knife seat 31 and a hinge sleeve 6 rotatably mounted on the knife seat 31; the rear end of the steel wire rope 5 is connected to the power rod assembly 23, and the front end is fixedly connected to the knife seat 31. The steel wire rope 5 is formed by twisting a plurality of spiral steel wires together, has a certain elasticity, is bendable and can transmit torque. When the angle of the knife seat 31 changes, the steel wire rope 5 can still transmit the power of the power rod assembly 23 to the knife seat 31, thereby driving the knife seat 31 to rotate.

[0030] As a further improvement of the present utility model, the rear end of the steel wire rope 5 is fixedly connected to the steel wire rope joint 51, and the rear end of the steel wire rope joint 51 is hinged to the front end of the power rod assembly 23. By hingedly connecting the steel wire rope joint 51 with the power rod assembly 23, power transmission can be ensured and a certain movable gap can be provided between the steel wire rope joint 51 and the power rod assembly 23, so that the steel wire rope 5 is evenly stressed, which is conducive to extending the service life of the steel wire rope 5.

[0031] like Figure 4 As shown, the articulated sleeve 6 is a columnar structure with a center hole in the center, and the center hole runs from the front end to the rear end of the articulated sleeve 6. The center hole in the front end of the articulated sleeve 6 is mounted on the knife seat 31 through a bearing sleeve, so that the articulated sleeve 6 can rotate relative to the knife seat 31; the rear end of the articulated sleeve 6 is provided with an articulated hanging piece 61, and two articulated hanging pieces 61 are symmetrically arranged on both sides of the center hole at the rear end of the articulated sleeve 6. The articulated hanging piece 61 is provided with a first articulated shaft 62 and a second articulated shaft 63, and the first articulated shaft 62 and the second articulated shaft 63 are both perpendicular to the axis of the center hole of the articulated sleeve 6, and the distance from the first articulated shaft 62 to the axis of the center hole is smaller than the distance from the second articulated shaft 63 to the axis of the center hole, and the shaft hole on the hanging piece 61 for installing the first articulated shaft 62 is an arc-shaped long hole, so that the first articulated shaft 62 can have a certain activity space along the arc-shaped long hole. The front end of the inner tube 22 is fixedly mounted with an inner tube hanging ear 221 adapted to the hinge hanging piece 61, and the inner tube hanging ear 221 is mounted on the first hinge shaft 62, so that the hinge sleeve 6 can swing at a certain angle relative to the inner tube 22; in addition, as Figure 5 As shown, a push-pull rod 211 is fixedly connected to the side wall of the front end of the outer sleeve 21 sleeved outside the inner tube 22, and the push-pull rod 211 is installed on the second hinge shaft 63. The push-pull rod 211 is a rectangular block structure welded on the side wall of the outer sleeve 21, located on one side of the front end surface of the outer sleeve 21, and the outer sleeve 21 is hinged to the hinge sleeve 6 through the push-pull rod 211, so that the hinge sleeve 6 can swing at a certain angle relative to the outer sleeve 21.

[0032] like Figure 2 , Figure 6 As shown, the operating handle 4 is fixedly connected to the rear end of the outer sleeve 21, and a through hole 41 is provided on the operating handle 4. A sliding sleeve 7 is slidably installed in the through hole 41. The front end of the sliding sleeve 7 is fixedly connected to the inner tube 22 and is coaxially arranged with the inner tube 22. In this way, when the sliding sleeve 7 moves axially in the operating handle 4, the inner tube 22 moves axially relative to the outer sleeve 21; the power rod assembly 23 passes through the through hole 41 and is fixedly connected to the power joint 1. When the sliding sleeve 7 moves axially in the operating handle 4, the power joint 1 transmits power to the cutter head 3 through the power rod assembly 23 without being affected; the outer wall of the sliding sleeve 7 is provided with a spiral inclined groove 71 and an axially arranged straight groove 72, as shown in FIG. Figure 6 , Figure 7As shown, the inclined groove 71 and the straight groove 72 are respectively arranged on both sides of the sliding sleeve 7, wherein the cross section of the straight groove 72 is an arc shape, and 2-4 straight grooves 72 can be arranged in parallel. This embodiment adopts three straight grooves 72, and different straight grooves 72 correspond to different deflection angles of the cutter head 3; the inner wall of the through hole 41 is provided with a limit rod 8 adapted to the inclined groove 71 and a bump ball 9 adapted to the straight groove 72. Figure 6 As shown, in this embodiment, the bead 9 is of prior art and is embedded in the inner wall of the through hole 41. The front end of the bead 9 is a retractable sphere, which will retract when subjected to pressure and pop out again after the external force disappears. The front end of the limit rod 8 is a hemispherical body or a cylinder adapted to the inclined groove 71, and the rear end has an external thread. The limit rod 8 is installed on the side wall of the operating handle 4 through the thread. The limit rod 8 can be rotated by a tool outside the operating handle 4 to adjust the tightness of the fit between the front end of the limit rod 8 and the inclined groove 71.

[0033] When in use, the power connector 1 is connected to the power handle, and the power handle transmits power to the power rod assembly 23 through the locking structure on the power connector 1, and then drives the knife seat 31 and the basket 32 ​​to rotate through the wire rope 5. The basket 32 ​​made of elastic material can efficiently remove soft tissues such as the nucleus pulposus while avoiding damage to surrounding bone tissues. In the initial state, the rotating cutter head 3 is coaxial with the transmission rod assembly 2, that is, the axis of the cutter seat 31 is coaxial with the inner tube 22 and the outer sleeve 21. When the angle of the cutter head 3 needs to be adjusted, the operating handle 4 is rotated to rotate the operating handle 4 relative to the sliding sleeve 7 by a certain angle. At this time, the bead 9 on the operating handle 4 slides from one straight groove to another straight groove, and the limit rod 8 slides a certain distance along the inclined groove 71, so that the sliding sleeve 7 generates a certain axial displacement when rotating, driving the inner tube 22 to generate a certain axial displacement relative to the outer sleeve 21. The relative position of the first hinge shaft 62 and the second hinge shaft 63 of the inner tube 22 relative to the front end of the outer sleeve 21 changes, and the angle of the hinge sleeve 6 is changed, thereby changing the angle of the cutter seat 31 and the cutter head 3. Changing the angle of the cutter head 3 can obtain a larger working area without changing the angle of the transmission rod assembly or the angle of the surgical instrument.

[0034] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A power cutter head for removing soft tissue, comprising a power joint (1) connected to a power handle, a transmission rod assembly (2) fixedly connected to the power joint (1), and a cutter head (3) arranged at the front end of the transmission rod assembly (2), characterized in that: The cutter head (3) comprises a cutter seat (31) and a net basket (32) fixedly connected to the cutter seat (31), wherein the net basket (32) is a sphere woven from elastic wires; the transmission rod assembly (2) comprises an outer sleeve (21), an inner tube (22) disposed in the inner cavity of the outer sleeve (21) and axially movable, and a power rod assembly (23) disposed in the inner cavity of the inner tube (22) and rotatable; the rear end of the power rod assembly (23) is connected to the power joint (1), and the front end is connected to the cutter seat (31) via a flexible connection device; the front end of the inner tube (22) is connected to the flexible connection device, and the rear end is connected to an operating handle (4).

2. A power cutter head for removing soft tissue according to claim 1, characterized in that: The flexible connection device comprises a steel wire rope (5) whose front end is fixedly connected to the knife seat (31) and an articulated sleeve (6) rotatably mounted on the knife seat (31); the rear end of the steel wire rope (5) is connected to the power rod assembly (23) and the front end is fixedly connected to the knife seat (31); the front end of the articulated sleeve (6) is mounted on the knife seat (31) through a bearing, the rear end of the articulated sleeve (6) is provided with an articulated hanging piece (61), and the articulated hanging piece (61) is provided with a first articulated shaft (62) and a second articulated shaft (63); the front end of the inner tube (22) is fixedly mounted with an inner tube hanging ear (221) adapted to the articulated hanging piece (61), and the inner tube hanging ear (221) is mounted on the first articulated shaft (62); the side wall of the front end of the outer sleeve (21) is fixedly connected with a push-pull rod (211), and the push-pull rod (211) is mounted on the second articulated shaft (63).

3. A power cutter head for removing soft tissue according to claim 1 or 2, characterized in that: The operating handle (4) is fixedly connected to the rear end of the outer sleeve (21); a through hole (41) is provided on the operating handle (4); a sliding sleeve (7) is slidably installed in the through hole (41); the front end of the sliding sleeve (7) is fixedly connected to the inner tube (22) and is coaxially arranged with the inner tube (22); the power rod assembly (23) passes through the through hole (41) and is fixedly connected to the power joint (1); a spiral inclined groove (71) and an axially arranged straight groove (72) are provided on the outer wall of the sliding sleeve (7); a limit rod (8) adapted to the inclined groove (71) and a bump ball (9) adapted to the straight groove (72) are provided on the inner wall of the through hole (41).

4. A power cutter head for removing soft tissue according to claim 2, characterized in that: The rear end of the steel wire rope (5) is fixedly connected to a steel wire rope joint (51), and the rear end of the steel wire rope joint (51) is hinged to the front end of the power rod assembly (23).

5. A power cutter head for removing soft tissue according to claim 1 or 2, characterized in that: The net basket (32) is planted with bristles.

6. A power cutter head for removing soft tissue according to claim 3, characterized in that: The front end of the limit rod (8) is a hemispherical body or a cylindrical body adapted to the inclined groove (71), and the rear end is provided with an external thread. The limit rod (8) is installed on the side wall of the operating handle (4) through the thread; the ball (9) is embedded in the inner wall of the through hole (41).

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