CN120036875B - Outer knife component and spine planer tool with adjustable bending angle - Google Patents

Abstract

The present invention relates to an external knife assembly and a spinal planer with an adjustable bending angle, belonging to the technical field of medical devices. The spinal planer includes an external knife mechanism, a control assembly and an internal knife assembly. The external knife mechanism has an elastic curved tube. The control assembly includes a control box, a shift lever, a double-pawl ratchet mechanism, a wire drawing and a control component. The shift lever is rotatably arranged in the control box and is used to drive the double-pawl ratchet mechanism. One end of the wire drawing is wound around the double-pawl ratchet mechanism and the other end is connected to the front end of the elastic curved tube. The control component is used to control the failure of the double-pawl ratchet mechanism. The external knife assembly and the spinal planer with an adjustable bending angle provided by the present invention can adjust the bending angle of the external knife assembly with one hand to achieve bending at various angles, effectively meeting the clinical demand for nucleus pulposus resection in minimally invasive spinal surgery, and the bending angle can be locked at any position.

Description

External knife assembly and spinal planer with adjustable bending angle

Technical Field

The invention belongs to the technical field of medical devices, and in particular relates to an external knife component and a spinal planer with adjustable bending angle.

Background Art

Minimally invasive procedures are now widely used in spinal surgery. These procedures utilize transforaminal endoscopic spinal discectomy (PELS) and surgical instruments. A spinal planer, used in conjunction with a surgical power unit, uses a high-speed motor to rotate the internal blade of the planer, allowing for nucleus pulposus removal. Compared to traditional manual tools, a spinal planer offers greater efficiency.

In endoscopic minimally invasive surgery, the spinal planer must be inserted into the instrument channel of the percutaneous foraminal endoscope, which requires the spinal planer to be in a straight state during the process of entering the instrument channel. However, during surgical treatment, a straight spinal planer cannot reach many narrow areas, which requires the spinal planer tool to have a certain bending angle.

Patent application number 202320015612.2 discloses a bendable shaver for percutaneous endoscopic lumbar discectomy, which can bend the front end of the blade by pressing the adjustment handle. However, its defect is that the doctor must keep pressing the adjustment handle to bend the front end of the blade. It does not have the function of locking the bending state. During the operation, the doctor is required to keep pressing the adjustment handle, which greatly increases the difficulty of the doctor's operation. In addition, the bending angle may change at any time during the operation because the doctor cannot maintain a constant force to press the adjustment handle, which greatly increases the risk of surgery.

Patent application number 202211536533.2 discloses an external knife assembly and a planer with adjustable bending angle, which can achieve the bending of the hinge structure at the front end of the front blade by rotating the adjustment assembly. However, its operation method is to rotate the adjustment assembly, which requires the doctor to hold the planer with one hand and rotate the adjustment assembly with the other hand during the operation. The rotation operation must be completed with both hands, and one hand cannot conveniently perform the rotation operation; in minimally invasive spinal surgery, the doctor usually holds the percutaneous endoscopic discectomy with one hand and operates the surgical instrument with the other hand. The solution provided by this patent obviously does not meet the clinical operation needs.

Summary of the Invention

In view of this, the purpose of the present invention is to provide an external knife assembly and a spinal planer with adjustable bending angle, which can adjust the bending angle of the external knife assembly with one hand to achieve bending at various angles, effectively meeting the clinical needs for nucleus pulposus resection in minimally invasive spinal surgery, and the bending angle can be locked at any position.

The technical solutions of the present invention are as follows:

The present invention provides an external knife assembly, comprising an external knife mechanism having an elastic bent tube and a control assembly located at the rear end thereof; the control assembly comprises a control box, a shift lever, a double pawl ratchet mechanism, a wire drawing and a control component, the shift lever being rotatably arranged on the control box and being used to drive the double pawl ratchet mechanism, one end of the wire drawing being wound around the double pawl ratchet mechanism and the other end being connected to the front end of the elastic bent tube, and the control component being used to control the double pawl ratchet mechanism to fail.

As an optional solution, the double-pawl ratchet mechanism includes a ratchet and two pawls that cooperate with each other, the ratchet is rotatably arranged in the control box, and the two pawls are in the same direction and are respectively installed on the shifting rod and the control box.

When the outer knife assembly is in the first state, the lever rotates and drives the ratchet to rotate forward through the pawl, the ratchet pulls the wire drawing backward, and the wire drawing pulls the elastic bent tube to bend and deform toward one side; when the outer knife assembly is in the second state, the double pawl ratchet mechanism fails, the two pawls disengage from the ratchet, and the elastic bent tube drives the ratchet to rotate in the opposite direction through the wire drawing.

As an optional solution, a reset torsion spring is provided between the shift lever and the control box, and the reset torsion spring enables the shift lever to have a tendency to rotate and reset.

As an optional solution, the rotating shaft of the shift lever extends in the left-right direction, and the shift lever extends in the radial direction of the outer knife mechanism and can be moved backward.

As an optional solution, the control box is provided with a fan-shaped slot, and the shifting rod passes through the fan-shaped slot and a portion of the lever is exposed from the control box.

As an optional solution, each of the pawls is correspondingly provided with a compression spring, and the compression spring presses the pawl onto the ratchet.

As an optional solution, the control member includes a reset plate, which is movably arranged on the control box and has two wedge-shaped bosses on the first side. The two wedge-shaped bosses respectively cooperate with the two pawls and can push the pawls out of the ratchet.

As an optional solution, a pressing boss is provided on the second side of the reset plate, and the pressing boss extends from the control box.

As an optional solution, the control member further includes a reset spring, which tends to move the reset plate away from the pawl.

As an optional solution, the outer knife mechanism further includes an outer knife tube, a C-shaped tube and a sleeve, the C-shaped tube is sleeved on the outer knife tube and has an axial through groove for accommodating the wire drawing, and the sleeve is sleeved on the C-shaped tube.

As an optional solution, the elastic bent tube is arranged at the front end of the outer knife tube.

As an optional solution, the control box includes a box body and a box cover, and the box body and the box cover are detachably connected.

As an optional solution, the control box is provided with a mounting through hole, and the rear end of the external knife mechanism is passed through the mounting through hole.

As an optional solution, the elastic elbow is provided with a plurality of circumferential through grooves.

The present invention also provides a spinal planer with adjustable bending angle, comprising an inner knife assembly and the outer knife assembly mentioned above, wherein the inner knife assembly is inserted into the outer knife mechanism.

The beneficial effects of the present invention are:

The external knife assembly and the spinal planer with adjustable bending angle provided by the present invention can adjust the bending angle of the external knife assembly under a microscope. The bending angle can be locked at any position to achieve bending at various angles. The doctor does not need to operate the control assembly all the time. In addition, the doctor can perform operations such as angle bending, angle locking and unlocking with one hand. The operation is easy and clinically feasible. It effectively meets the clinical demand for nucleus pulposus resection in minimally invasive spinal surgery and can adapt to various complex intervertebral channel requirements.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without inventive work. The above and other objects, features and advantages of the present invention will become more apparent through the accompanying drawings. The same reference numerals indicate the same parts throughout the drawings. The drawings are not intentionally scaled to their actual sizes, and the focus is on illustrating the main purpose of the present invention.

FIG1 is a schematic diagram of a spinal shaver provided by an embodiment of the present invention in one state;

FIG2 is a schematic diagram of another state of the spinal planer provided by an embodiment of the present invention;

FIG3 is a cross-sectional view of a spinal shaver provided by an embodiment of the present invention;

FIG4 is a partial enlarged schematic diagram of portion A of FIG3 ;

FIG5 is a partial enlarged schematic diagram of portion B of FIG3 ;

FIG6 is a first structural diagram of an elastic curved tube of a spinal shaver provided by an embodiment of the present invention;

FIG7 is a second structural diagram of the elastic curved tube of the spinal shaver provided in an embodiment of the present invention;

FIG8 is a schematic structural diagram of a control assembly of a spinal shaver provided in an embodiment of the present invention;

FIG9 is a schematic diagram of a partial rear end structure (without the box cover) of a spinal shaver provided in an embodiment of the present invention;

FIG10 is a schematic diagram of a partial rear end structure of a spinal shaver (excluding the box cover and reset plate) provided in an embodiment of the present invention;

FIG11 is a schematic structural diagram of a box body of a spinal shaver provided in an embodiment of the present invention;

FIG12 is a first schematic diagram of the cooperation relationship between the lever and the first pawl of the spinal planer provided in an embodiment of the present invention;

FIG13 is a second schematic diagram of the cooperation relationship between the lever and the first pawl of the spinal planer provided in an embodiment of the present invention;

FIG14 is a schematic structural diagram of a reduction plate of a spinal shaver provided in an embodiment of the present invention;

FIG15 is a schematic structural diagram of the inner blade assembly of the spinal shaver provided in an embodiment of the present invention.

Icons: 10-spinal planer; 11-external knife mechanism; 12-control assembly; 14-inner knife assembly; 110-external knife tube; 111-C-shaped tube; 112-sleeve; 113-elastic elbow; 114-external joint; 120-control box; 121-lever; 122-drawing; 123-ratchet; 124-first pawl; 125-second pawl; 126-reset torsion spring; 127-fan-shaped groove; 128-compression spring; 129-reset plate; 130-wedge-shaped boss; 131-reset spring; 132-pressing boss; 133-circumferential through groove; 140-inner knife tube; 141-connecting part; 142-inner knife head; 143-inner joint.

DETAILED DESCRIPTION

To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of 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. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

Furthermore, the terms “first”, “second”, etc. are merely used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

Please refer to Figures 1 to 3. An embodiment of the present invention provides a spinal planer 10 with an adjustable bending angle. The spinal planer 10 can be used in minimally invasive spinal surgery and can be used in conjunction with a surgical power device. Driven by a high-speed motor of the surgical power device, the spinal planer 10 can perform nucleus pulposus removal treatment.

The spinal shaver 10 is mainly composed of an outer blade assembly and an inner blade assembly 14, wherein the inner blade assembly 14 is disposed inside the outer blade assembly. Generally speaking, the outer blade assembly and the inner blade assembly 14 need to be used in conjunction with each other, but the outer blade assembly can be independently produced, manufactured, sold, and used without relying on the inner blade assembly 14.

First, it should be noted that the directions "front" and "back" in this embodiment can be determined by the distance from the lesion. For example, "front" refers to the direction closer to the lesion, and "back" refers to the direction farther from the lesion. Of course, these directions are not absolute, but relative. In other embodiments, "back" refers to the direction closer to the lesion, and "front" refers to the direction farther from the lesion.

The specific structures of the outer blade assembly and the inner blade assembly 14 are described in detail below.

The outer knife assembly is mainly composed of an outer knife mechanism 11 and a control assembly 12. The control assembly 12 is arranged at the rear end of the outer knife mechanism 11. The middle part or the position near the front end of the outer knife mechanism 11 can be bent. The control assembly 12 is used to control whether the outer knife mechanism 11 bends and the bending amplitude.

The structure of the outer knife mechanism 11 is not limited and can refer to the existing technology. In particular, please refer to Figures 3 to 7, the outer knife mechanism 11 at least includes an outer knife tube 110, an elastic bend 113 and an outer knife head, and the elastic bend 113 is located between the outer knife tube 110 and the outer knife head.

The outer blade tube 110 is a tubular structure, which can be a round tube, a square tube, an oval tube, etc., with a hollow interior and open ends. The length of the outer blade tube 110 is not limited and can be set as needed.

The rear end of the outer blade tube 110 can be detachably connected to the surgical power device. The outer blade tube 110 and the surgical power device can be directly connected or indirectly connected through an external connector 114 .

The elastic bend 113 is located at the front end of the outer blade tube 110. The elastic bend 113 can be used as a component of the outer blade tube 110, and the two can also be independently set and connected. The connection method between the two is not limited, such as one-piece molding, welding, bonding, interference fit, etc.

The elastic curved tube 113 may be a tubular structure, such as a round tube, a square tube, an elliptical tube, an irregular tube, etc.

Generally speaking, the outer blade tube 110 has a certain strength and cannot bend, while the elastic bent tube 113 can bend, that is, the elastic bent tube 113 can undergo elastic deformation. Under the action of external force, the elastic bent tube 113 can bend or fold toward one side. Bending means that the elastic bent tube 113 bends in an arc shape, and folding means that the elastic bent tube 113 is divided into at least two straight sections, and the angle between the two adjacent sections can change. After the external force disappears, the elastic bent tube 113 can return to its original shape.

The structure of the elastic bend 113 can refer to the existing technology. In this embodiment, the following scheme can be adopted but not limited to: the elastic bend 113 is provided with a plurality of circumferential grooves 133, and the plurality of circumferential grooves 133 are spaced apart along the front-to-back direction.

The material of the elastic elbow 113 is not limited and can be metal or plastic.

Generally speaking, when there is no external force, the elastic bend 113 is straight, and the axis of the elastic bend 113 coincides with the axis of the outer knife tube 110. Of course, it is also possible that the elastic bend 113 is slightly bent in the initial state or the axis of the elastic bend 113 is set at an angle to the axis of the outer knife tube 110.

The number of circumferential through slots 133 is not limited, and can include three, four, six, or ten, for example. Generally speaking, the greater the number of circumferential through slots 133, the greater the maximum bending amplitude of the elastic bend 113. Conversely, the fewer the number of circumferential through slots 133, the smaller the maximum bending amplitude of the elastic bend 113. Assuming that the maximum bending angle of the elastic bend 113 is 60°, the bending angle of the elastic bend 113 under external force can be 0°, 10°, 20°, 30°, 40°, 50°, 60°, and so on.

The circumferential through-slot 133 is a strip-shaped notch extending along the circumference of the elastic elbow 113. The central angle of the circumferential through-slot 133 is not limited, and can be, for example, 80°, 110°, 150°, 180°, 240°, etc. This configuration reduces the strength of the elastic elbow 113. Under the action of external force, the two sides of the circumferential through-slot 133 can be brought closer together, thereby causing the elastic elbow 113 to bend toward one side.

The orientation of the circumferential through grooves 133 is not limited. The orientation mentioned here refers to the orientation of the central region of the circumferential through grooves 133. Generally speaking, the orientation of at least two portions of the circumferential through grooves 133 is not limited. For example, in this embodiment, the multiple circumferential through grooves 133 are divided into a plurality of first through grooves and a plurality of second through grooves, wherein the first through grooves face one side of the elastic bend 113 and the second through grooves face the other side of the elastic bend 113. The first through grooves and the second through grooves are arranged in an alternating manner. This arrangement ensures that the bending direction of the elastic bend 113 is relatively fixed.

In other embodiments, the structure of the elastic bend 113 may also adopt other technical solutions, such as: multiple circumferential grooves 133 facing the same side of the elastic bend 113, multiple circumferential grooves 133 distributed in a spiral or quadrilateral pattern, etc.; the elastic bend 113 is provided with a serrated spiral groove, or the elastic bend 113 uses a plastic hose embedded in a spiral steel wire, or the elastic bend 113 adopts a serpentine structure that can be elastically reset. The serpentine structure means that the elastic bend 113 includes multiple annular structures, and two adjacent annular structures are hinged and the angle between the axes of the two can be changed. The elastic reset structure is not limited, for example, a torsion spring is provided at the hinge, or the outer side of the serpentine structure is covered with an elastic plastic layer, etc.

The outer blade head is located at the front end of the elastic curved tube 113. The outer blade head and the elastic curved tube 113 are connected in any manner, such as integrally forming, welding, bonding, interference fit, etc.

The structure of the outer cutter head can refer to the prior art. For example, in this embodiment, a planing window is provided on one side of the outer cutter head, and a serrated structure is provided at the planing window. In other embodiments, the planing window can also be provided at the front end of the outer cutter head, and the serrated structure can also be replaced by a blade, etc.

When the elastic curved tube 113 bends toward one side, its front end can drive the outer cutter head to change position, thereby changing the position of the outer cutter head and making the planing window adjacent to the lesion tissue that needs to be planed.

The control assembly 12 is located at the rear end of the outer blade mechanism 11. The control assembly 12 can be directly connected to the rear end of the outer blade tube 110 or indirectly connected through other components. The control assembly 12 is primarily used to control whether the elastic bend tube 113 bends and adjust the bending angle of the elastic bend tube 113. As shown in Figures 8-14, the control assembly 12 includes a control box 120, a lever 121, a double-pawl ratchet mechanism, a wire drawing 122, and a control member.

The control box 120 is connected to the rear end of the outer knife tube 110, and the connection method between the two is not limited, such as one-piece molding, welding, bonding, interference fit, etc. In this embodiment, a mounting hole can also be provided on the control box 120, and the rear end of the outer knife mechanism 11 is passed through the mounting hole.

The style of the control box 120 is not limited, and it can be a box structure, a plate structure, a frame structure, etc. In this embodiment, the control box 120 includes a box body and a box cover, and the box body and the box cover are detachably connected, such as by buckling or snapping.

In other embodiments, the control box 120 does not include a box cover, or the box body and the box cover are an integrated structure.

One end of the lever 121 is rotatably mounted on the control box 120. The rotational connection method between the two is not limited. For example, the two are matched through a rotating shaft, or a cylindrical columnar portion is provided in the control box 120, and one end of the lever 121 is rotatably mounted on the columnar portion.

A portion of the lever 121 extends from the control box 120. The extension length of the lever 121 can be set as needed. The lever 121 can be in the shape of a rod, tube, plate, or sheet. Medical personnel can use their thumb or index finger to rotate the lever 121, which is used to drive the double-pawl ratchet mechanism. Anti-slip grooves can be provided on one side of the lever 121 to prevent slipping.

The control box 120 is provided with a fan-shaped slot 127, through which the lever 121 passes, with a portion exposed from the control box 120. The fan-shaped slot 127 limits the rotation range of the lever 121, thereby ensuring that the lever 121 has a first stop and a second stop during rotation, between which the lever 121 can rotate. Of course, in other embodiments, the control box 120 may not be provided with the fan-shaped slot 127.

The lever 121 can be rotated in any direction, for example, backward, forward, left, right, etc. In this embodiment, the rotation axis of the lever 121 extends in the left-right direction, and the lever 121 extends radially along the outer blade mechanism 11 and can be moved backward. This arrangement allows the lever 121 to align with the thumb when the surgeon grips the spinal shaver 10, allowing the thumb to easily move the lever 121 without interfering with the other fingers' grip. Of course, the surgeon can also use the index finger or other fingers to move the lever 121.

In addition, a return torsion spring 126 may be provided between the lever 121 and the control box 120. The installation method of the return torsion spring 126 may refer to the prior art. For example, the return torsion spring 126 is sleeved on the rotating shaft of the lever 121, and the two ends of the return torsion spring 126 respectively abut the lever 121 and the control box 120. In this embodiment, the box body is provided with a central hole, the outer side of which is provided with a first recessed groove. One end of the lever 121 is provided with a rotation shaft hole. The axis of the rotation shaft hole coincides with the axis of the central hole. A pin is inserted through the rotation shaft hole and the central hole. A second recessed groove is provided on the outer side of the rotation shaft hole. The two ends of the return torsion spring 126 are respectively embedded in the first recessed groove and the second recessed groove.

The return torsion spring 126 provides a rotational reset tendency for the lever 121, allowing it to have a first position and a second position. When the lever 121 is pulled by the thumb, it rotates from the first position to the second position. When the lever 121 is released, the return torsion spring 126 drives the lever 121 from the second position back to the first position. With this arrangement, after pulling the lever 121, the physician simply releases their thumb, and the lever 121 returns to its original position, ready for the next pull. Of course, in other embodiments, the return torsion spring 126 may be omitted, allowing reset through thumb movement.

The double-pawl ratchet mechanism is arranged in the control box 120. The double-pawl ratchet mechanism mainly consists of a ratchet 123 and two pawls. The two pawls cooperate with the ratchet 123 respectively. Each pawl abuts against the ratchet 123. Each pawl can make the ratchet 123 rotate in one direction and lock in the reverse direction.

The two pawls are arranged in the same direction, that is, under the action of the two pawls, the ratchet 123 can still rotate in one direction and lock in the opposite direction. For example, when any one pawl or both pawls are pressed against the ratchet 123, the ratchet 123 can rotate clockwise and lock counterclockwise, or can rotate counterclockwise and lock clockwise.

For the convenience of description, the two pawls are defined as the first pawl 124 and the second pawl 125 respectively, wherein the first pawl 124 is rotatably set on the lever 121. When the lever 121 rotates, it can drive the first pawl 124 to rotate synchronously, and the second pawl 125 is rotatably set in the control box 120.

When the shift lever 121 is rotated from the first position to the second position, the shift lever 121 drives the first pawl 124 to rotate, and the first pawl 124 can push the ratchet 123 to rotate forward. At this time, since the second pawl 125 is in the same direction as the first pawl 124, the second pawl 125 will not prevent the ratchet 123 from rotating, and the ratchet 123 rotates relative to the second pawl 125; when the shift lever 121 is rotated from the second position to the first position, since the position of the second pawl 125 is fixed, the second pawl 125 abuts against the ratchet 123, and the ratchet 123 cannot rotate in the opposite direction, while the first pawl 124 can move in the opposite direction relative to the ratchet 123. At this time, the shift lever 121 drives the first pawl 124 to return to its original position.

To prevent the pawl from moving abnormally, in this embodiment, each pawl is provided with a corresponding compression spring 128, which is used to press the pawl against the ratchet 123. The compression spring 128 can be a compression spring or a tension spring, and its installation method can refer to the existing technology. Taking the compression spring as an example: the two compression springs 128 are respectively defined as a first spring and a second spring, wherein a limiting boss is provided at one end of the deflector rod 121, and the two ends of the first spring respectively abut against the first pawl 124 and the limiting boss. The control box 120 is provided with a second boss, and the two ends of the second spring respectively abut against the second pawl 125 and the second boss.

One end of the wire drawing 122 is wound around the double-pawl ratchet mechanism and the other end is connected to the front end of the elastic bent tube 113. Specifically, a winding portion is coaxially arranged on the ratchet 123, and one end of the wire drawing is wound around the winding portion. When the ratchet 123 rotates forward, the rear end of the wire drawing 122 can be wound around the winding portion, so that the wire drawing 122 moves backward, and then pulls the elastic bent tube 113. Since the rear end position of the elastic bent tube 113 is fixed, the elastic bent tube 113 can only bend and deform toward one side; when the ratchet 123 rotates reversely, the elastic bent tube 113 recovers under the action of its own elastic force, pulling the wire drawing 122 forward, and then causing the ratchet 123 to rotate reversely, so that the part of the wire drawing 122 wound on the ratchet 123 is straightened.

The styles or materials of the drawing wire 122 are different and can be in the form of a thread, a rope, a hose, etc. A through hole can be provided at the front end of the box body, and the drawing wire 122 passes through the through hole and is located on one side of the elastic elbow 113 .

The wire drawing 122 can be passed through the outer knife tube 110 , or other solutions can be adopted. For example, the outer knife mechanism 11 further includes a C-shaped tube 111 and a sleeve 112 .

The C-shaped tube 111 has a C-shaped cross-section and has an axial through-slot for accommodating the wire drawing 122. The C-shaped tube 111 is sleeved on the outer blade tube 110. The sleeve 112 is a tubular structure and sleeved on the C-shaped tube 111. The outer blade tube 110, the C-shaped tube 111, and the sleeve 112 together form an axial channel. The wire drawing 122 is passed through the axial channel and extends all the way to the elastic bend 113. In addition, an axial through-hole or axial groove can also be provided on the inner side of the elastic bend 113. The wire drawing 122 can pass through the axial through-hole or axial groove and connect with the front end of the elastic bend 113. Of course, in some embodiments, it is also possible for the elastic bend 113 to be connected to the C-shaped tube 111 or the sleeve 112.

The control part is used to control the failure of the double pawl ratchet mechanism. "Failure of the double pawl ratchet mechanism" means that the double pawl ratchet mechanism cannot fix the rear end of the wire draw 122, that is, the elastic force of the elastic bend 113 can pull the wire draw 122 forward. When the wire draw 122 is pulled forward, the wire draw 122 can pull the ratchet 123 to rotate in the opposite direction.

The outer knife assembly has a first state and a second state: when the outer knife assembly is in the first state, the lever 121 can rotate and drive the ratchet 123 to rotate forward through the first pawl 124, and the ratchet 123 pulls the wire 122 backward. The rear end of the wire 122 is wound around the ratchet 123, and the wire 122 pulls the elastic bent tube 113 to bend and deform toward one side. During this process, if the lever 121 is released, the lever 121 can be reset, but the ratchet 123 is limited by the second pawl 125 and cannot be reset; when the outer knife assembly is in the second state, the control part makes the double pawl ratchet mechanism invalid, and both pawls are disengaged from the ratchet 123. The elastic bent tube 113 elastically resets and pulls the wire 122 forward to drive the ratchet 123 to rotate in the opposite direction until the elastic bent tube 113 returns to its original state.

The style of the control part is not limited. For example, a reset button is provided on one side of the first pawl 124 and/or the second pawl 125, and the reset button extends from the control box 120. When the doctor pushes the reset button, the first pawl 124 and the second pawl 125 can be rotated, thereby disengaging the first pawl 124 or the second pawl 125 from the ratchet 123.

In this embodiment, the structure of the control member may adopt but is not limited to the following scheme: the control member includes a reset plate 129, and the reset plate 129 is a plate-shaped structure or a block-shaped structure.

The reset plate 129 is movably disposed on the control box 120 , and the reset plate 129 and the control box 120 may be rotationally engaged, slidingly engaged, or the like.

Taking sliding fit as an example, the reset plate 129 can move axially along the center hole of the control box 120. Two wedge-shaped bosses 130 are provided on the first side of the reset plate 129. The wedge-shaped bosses 130 are provided with wedge surfaces. The wedge surfaces are in contact with or adjacent to the corresponding pawls. The wedge surfaces are inclined surfaces. The two wedge-shaped bosses 130 respectively cooperate with the two pawls, and the two can be in contact with each other. When the reset plate 129 is pushed and moves axially along the center hole, the wedge surfaces can squeeze and push the corresponding pawls to rotate, thereby causing the pawls to disengage from the ratchet 123.

The reset plate 129 can be reset manually or elastically. In this embodiment, the reset plate 129 is reset elastically. Specifically, the control component also includes a reset spring 131. The reset spring 131 can be a compression spring or a tension spring. Its installation method can refer to the existing technology. Taking the compression spring as an example, the reset spring 131 is located between the reset plate 129 and the control box 120. The two ends of the reset spring 131 are respectively in contact with the reset plate 129 and the control box 120. The reset spring 131 makes the reset plate 129 tend to move away from the pawl.

In addition, a pressing boss 132 may be provided on the second side of the reset plate 129. The pressing boss 132 extends from one side of the control box 120. The pressing boss 132 may be of any shape, such as a circular pressing boss 132 or a square pressing boss 132. The doctor can simply press the pressing boss 132 with his thumb or index finger to move the reset plate 129, thereby causing the wedge-shaped boss 130 to push the pawl open.

The structure of the inner knife assembly 14 can refer to the existing technology. In this embodiment, the following scheme can be adopted but not limited to: Referring to Figure 15, the inner knife assembly 14 includes an inner knife tube 140, a connecting part 141 and an inner knife head 142.

The inner blade tube 140 may be a tubular structure or a rod-shaped structure, such as a round tube, a square tube, a solid rod, etc.

The inner blade tube 140 is inserted into the outer blade tube 110. Its outer diameter is smaller than its inner diameter. The rear end of the inner blade tube 140 is detachably connected to a surgical power unit, which can drive the inner blade tube 140 to rotate about its centerline. The inner blade tube 140 and the surgical power unit can be connected directly or indirectly via an inner connector 143.

The connecting portion 141 is located at the front end of the inner knife tube 140, and the connecting portion 141 corresponds to the elastic bend tube 113 of the outer knife mechanism 11, that is, the connecting portion 141 is located on the inner side of the elastic bend tube 113. Generally speaking, the length of the connecting portion 141 is greater than the length of the elastic bend tube 113. Of course, it is also possible that the length of the connecting portion 141 is less than the length of the elastic bend tube 113.

The ends of the connecting portion 141 are connected to the inner blade tube 140 and the inner blade head 142, respectively. The structure of the connecting portion 141 is not limited, as long as it can bend and deform while also transmitting torque. In this embodiment, the connecting portion 141 is provided with a serrated spiral groove that can be bent to any angle. In other embodiments, the spiral groove can also be a helical structure.

When the surgical power device drives the inner blade tube 140 to rotate, the connecting portion 141 can rotate with the inner blade tube 140, and during a certain period of time, the bending angle of the elastic bend 113 remains unchanged. Under the restriction of the elastic bend 113, the connecting portion 141 can bend.

The inner cutter head 142 is arranged at the front end of the connecting part 141. The structure of the inner cutter head 142 can refer to the existing technology. For example, a serrated structure is provided on one side of the inner cutter head 142, and the serrated structure matches the position of the planing window. That is, when the serrated structure of the inner cutter head 142 is rotated to the planing window, the lesion area located at the planing window can be removed.

In some embodiments, the inner blade tube 140, the connecting portion 141, and the inner blade head 142 can all be hollow and interconnected. The rear end of the inner blade tube 140 can be connected to a suction device that can extract the scraped tissue. Of course, the scraped tissue can also be extracted through the gap between the inner blade assembly 14 and the outer blade mechanism 11 or by other equipment.

The working principle of the spinal planer 10 provided in this embodiment is as follows:

The inner knife assembly 14 is inserted into the outer knife mechanism 11;

Connect the spinal planer 10 to a surgical power unit, wherein the rear end of the outer blade tube 110 is connected to a fixed portion of the surgical power unit via an outer connector 114, and the rear end of the inner blade tube 140 is connected to a high-speed motor of the surgical power unit via an inner connector 143. The rear end of the inner blade assembly 14 can be driven to rotate by the high-speed motor.

Insert the spinal shaver 10 into the instrument channel of the intervertebral foraminal endoscope until the spinal shaver 10 is inserted into place, that is, the outer blade head and the inner blade head 142 are adjacent to the nucleus pulposus or other tissue to be removed. During this process, the spinal shaver 10 is in a straightened state;

To adjust the bending angle of the spinal planer 10, in this state, the doctor usually holds the intervertebral foraminal endoscope in one hand and the spinal planer 10 in the other hand. At this time, the doctor can use the index finger or thumb of the hand holding the spinal planer 10 to move the lever 121. The lever 121 drives the first pawl 124 to rotate, and the first pawl 124 drives the ratchet 123 to rotate. The rear end of the pull wire 122 is wound around the ratchet 123, thereby pulling the elastic curved tube 113 to bend toward one side.

The doctor releases the lever 121, and the lever 121 rotates in the opposite direction under the action of the return torsion spring 126 until it returns to its original position. During this process, the second pawl 125 presses against the ratchet 123, preventing the ratchet 123 from rotating in the opposite direction.

The doctor continues to turn the lever 121, thereby increasing the bending angle of the elastic curved tube 113;

Repeat the above steps until the bending amplitude of the elastic curved tube 113 reaches the desired value, at which point the planing window of the outer blade head is adjacent to the lesion tissue;

The surgical power device is started, and the high-speed motor drives the inner knife assembly 14 to rotate at high speed. The inner knife head 142 rotates at high speed inside the outer knife head. The two cooperate with each other to remove the nucleus pulposus or other tissues. The removed nucleus pulposus or other tissues can be extracted from the interior of the inner knife tube 140.

When the spinal planer 10 needs to be removed, the pressing boss 132 of the reset plate 129 is pressed by the thumb or index finger, so that the reset plate 129 moves axially along the center hole. The wedge-shaped boss 130 of the reset plate 129 squeezes the first pawl 124 and the second pawl 125, so that the first pawl 124 and the second pawl 125 are respectively disengaged from the ratchet 123. The elastic elbow 113 is reset and straightened under its own elastic action. During this process, the ratchet 123 can be pulled in the opposite direction by the wire drawing 122.

After the spinal planer 10 is straightened, the pressing boss 132 is released, and the reset plate 129 is reset under the action of the reset spring 131, so that the first pawl 124 and the second pawl 125 can abut against the ratchet 123 again;

The spinal shaver 10 in the straightened state is taken out.

The above steps can be increased, decreased, modified, or the order can be adjusted as needed. For example, if the reset torsion spring 126 is not provided between the lever 121 and the control box 120 , the doctor can manually reset the lever 121 .

The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims (8)

1. The outer cutter assembly comprises an outer cutter mechanism with an elastic bent pipe and a control assembly positioned at the rear end of the outer cutter mechanism, and is characterized in that the control assembly comprises a control box, a deflector rod, a double-pawl ratchet mechanism, a wire drawing and a control piece, wherein the deflector rod is rotatably arranged on the control box and used for driving the double-pawl ratchet mechanism, one end of the wire drawing is wound on the double-pawl ratchet mechanism, the other end of the wire drawing is connected with the front end of the elastic bent pipe, and the control piece is used for controlling the double-pawl ratchet mechanism to fail;

The double-pawl ratchet mechanism comprises a ratchet wheel and two pawls which are matched with each other, the ratchet wheel is rotatably arranged in the control box, and the two pawls are arranged in the same direction and are respectively arranged on the deflector rod and the control box;

The control piece comprises a reset plate, the reset plate is movably arranged on the control box, two wedge-shaped bosses are arranged on the first side of the reset plate, and the two wedge-shaped bosses are respectively matched with the two pawls and can push the pawls to be separated from the ratchet;

when the outer cutter assembly is in a first state, the deflector rod rotates and drives the ratchet wheel to rotate forward through the first pawl, the ratchet wheel pulls the wire drawing backward and drives the elastic bent pipe to bend and deform towards one side, when the deflector rod is reset reversely, the ratchet wheel is limited by the second pawl, when the outer cutter assembly is in a second state, the control piece enables the two pawls to be separated from the ratchet wheel, and the elastic bent pipe is reset elastically and pulls the wire drawing to move forward so as to drive the ratchet wheel to rotate reversely.

2. The outer knife assembly of claim 1, wherein a return torsion spring is disposed between the lever and the control box, the return torsion spring tending to rotationally return the lever.

3. The outer knife assembly of claim 1, wherein the control box is provided with a scalloped slot through which the lever passes and a portion of which is exposed to the control box.

4. The outer knife assembly of claim 1, wherein each pawl is correspondingly provided with a hold-down spring that holds down the pawl on the ratchet.

5. The outer knife assembly of claim 1 wherein the control member further comprises a return spring that biases the return plate away from the pawl.

6. The outer knife assembly of claim 1, wherein the outer knife mechanism further comprises an outer knife tube, a C-tube and a sleeve, the C-tube being nested within the outer knife tube and having an axial through slot for receiving the wire drawing, the sleeve being nested within the C-tube.

7. The outer knife assembly of claim 1 wherein the control box comprises a box body and a box cover, the box body and the box cover being removably connected.

8. A spine planer tool with an adjustable bending angle, comprising an inner cutter assembly and the outer cutter assembly of any one of claims 1-7, wherein the inner cutter assembly is arranged in the outer cutter mechanism in a penetrating manner.