Outer cutter assembly and spine planer tool with adjustable bending angle

Abstract

The invention relates to an outer cutter assembly and a spine planer tool with an adjustable bending angle, and belongs to the technical field of medical instruments. The spine planer tool comprises an outer tool mechanism, a control assembly and an inner tool assembly, the outer tool mechanism is provided with an elastic bent pipe, the control assembly comprises a control box, a deflector rod, a double-pawl ratchet mechanism, a pull wire and a control piece, and the deflector rod is rotationally arranged in the control box and used for driving the double-pawl ratchet mechanism; one end of the drawing wire is wound on the double-pawl ratchet mechanism, and the other end of the drawing wire is connected with the front end of the elastic bent pipe; the control piece is used for controlling the double-pawl ratchet mechanism to fail. According to the outer knife assembly and the spine planer tool with the adjustable bending angle, the bending angle of the outer knife assembly can be adjusted with one hand, bending at various angles is achieved, the clinical requirement for nucleus pulposus excision in spine minimally invasive surgery is effectively met, and the bending angle can be locked at any position.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and particularly relates to an outer knife assembly and a spinal shaver with adjustable bending angle. Background Art

[0002] Minimally invasive surgery has been widely used in spinal surgery. Minimally invasive spinal surgery uses a spinal intervertebral foramen endoscope in combination with surgical instruments for treatment. The spinal shaver is used in conjunction with a surgical power device, and a high-speed motor is used to drive the inner knife of the spinal shaver to rotate, which can be used for nucleus pulposus removal treatment. Compared with traditional manual tools, the spinal shaver has higher working efficiency.

[0003] In endoscopic minimally invasive surgery, the spinal shaver must be inserted into the instrument channel of the intervertebral foramen endoscope. This requires that the spinal shaver be in a straight state during the process of entering the instrument channel. However, during surgical treatment, the straight spinal shaver cannot reach many narrow areas, which requires the spinal shaver to have a certain bending angle.

[0004] The patent with application number 202320015612.2 discloses a bendable shaving knife under an intervertebral foramen endoscope, which can achieve the bending of the front end of the knife head by pressing the adjustment handle. However, its defect is that the doctor must continuously press the adjustment handle to make the front end of the knife head bend. It does not have the function of locking the bending state. During the operation, the doctor must continuously press the adjustment handle, which greatly increases the operation difficulty of the doctor. Moreover, its bending angle may change at any time during the operation because the doctor cannot keep the force of pressing the adjustment handle constant, which greatly increases the surgical risk.

[0005] The patent with application number 202211536533.2 discloses an outer knife assembly and a shaving knife with adjustable bending angle, which can achieve the bending of the hinge structure at the front end of the front knife head by rotating the adjustment assembly. However, its operation method is to rotate the adjustment assembly, which requires the doctor to hold the shaving knife with one hand and rotate the adjustment assembly with the other hand during the operation. This rotation operation must be completed with both hands, and it is impossible to conveniently perform the rotation operation with one hand. In minimally invasive spinal surgery, doctors usually hold the intervertebral foramen endoscope with one hand and operate the surgical instrument with the other hand. The solution provided by this patent obviously does not meet the clinical operation requirements. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide an outer knife assembly and a spinal shaver with adjustable bending angle, which can adjust the bending angle of the outer knife assembly with one hand, achieve bending at multiple angles, effectively meet the clinical requirements for nucleus pulposus resection in minimally invasive spinal surgery, and the bending angle can be locked at any position.

[0007] The technical solution of the present invention is as follows: The present invention provides an outer knife assembly, which includes an outer knife mechanism having an elastic bent pipe and a control assembly located at its rear end; the control assembly includes a control box, a lever, a double-ratchet pawl mechanism, a wire drawing, and a control member. The lever is rotatably arranged in the control box and is used to drive the double-ratchet pawl mechanism. One end of the wire drawing is wound around the double-ratchet pawl mechanism, and the other end is connected to the front end of the elastic bent pipe. The control member is used to control the failure of the double-ratchet pawl mechanism.

[0008] As an alternative, the double-ratchet pawl mechanism includes a ratchet wheel and two pawls that cooperate with each other. The ratchet wheel is rotatably arranged in the control box, and the two pawls are in the same direction and are respectively installed on the lever and the control box.

[0009] When the outer knife assembly is in the first state, the lever rotates and drives the ratchet wheel to rotate forward through the pawl. The ratchet wheel pulls the wire drawing backward, and the wire drawing pulls the elastic bent pipe to bend and deform toward one side. When the outer knife assembly is in the second state, the double-ratchet pawl mechanism fails, and the two pawls disengage from the ratchet wheel. The elastic bent pipe drives the ratchet wheel to rotate reversely through the wire drawing.

[0010] As an alternative, a return torsion spring is arranged between the lever and the control box, and the return torsion spring makes the lever tend to rotate back to its original position.

[0011] As an alternative, the rotating shaft of the lever extends in the left-right direction, and the lever extends radially along the outer knife mechanism and can be pulled backward.

[0012] As an alternative, the control box is provided with a sector-shaped groove, and the lever passes through the sector-shaped groove and a part of it is exposed outside the control box.

[0013] As an alternative, a pressing spring is correspondingly arranged for each pawl, and the pressing spring presses the pawl against the ratchet wheel.

[0014] As an alternative, the control member includes a return plate, the return plate is movably arranged in the control box, and two wedge-shaped bosses are arranged on the first side. The two wedge-shaped bosses respectively cooperate with the two pawls and can push the pawls to disengage from the ratchet wheel.

[0015] As an alternative, a pressing boss is arranged on the second side of the return plate, and the pressing boss protrudes from the control box.

[0016] As an alternative, the control member further includes a return spring, and the return spring makes the return plate tend to move away from the pawl.

[0017] As an alternative, 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. The sleeve is sleeved on the C-shaped tube.

[0018] As an alternative, the elastic elbow is arranged at the front end of the outer knife tube.

[0019] As an alternative, the control box includes a box body and a box cover, and the box body and the box cover are detachably connected.

[0020] As an alternative, the control box is provided with an installation through hole, and the rear end of the outer knife mechanism passes through the installation through hole.

[0021] As an alternative, the elastic elbow is provided with a plurality of circumferential through grooves.

[0022] The present invention also provides a spinal shaver with adjustable bending angle, which includes an inner knife assembly and the above-mentioned outer knife assembly, and the inner knife assembly is inserted into the outer knife mechanism.

[0023] The beneficial effects of the present invention are: The outer knife assembly and the spinal shaver with adjustable bending angle provided by the present invention can adjust the bending angle of the outer knife assembly under the microscope. The bending angle can be locked at any position to achieve bending at multiple angles. It is not necessary for the doctor to continuously manipulate the control component. Moreover, the doctor can perform operations such as angle bending, angle locking, and unlocking with one hand, which is easy to operate, has clinical feasibility, effectively meets the clinical requirements for nucleus pulposus resection in minimally invasive spinal surgery, and can adapt to various complex intervertebral channel requirements. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings. As shown in the drawings, the above-mentioned and other objects, features, and advantages of the present invention will become clearer. The same reference numerals indicate the same parts in all the drawings. The drawings are not deliberately drawn to scale in actual size, and the focus is on showing the gist of the present invention.

[0025] Figure 1 It is a schematic diagram of one state of the spinal shaver provided by the embodiment of the present invention; Figure 2 It is a schematic diagram of another state of the spinal shaver provided by the embodiment of the present invention; Figure 3 It is a cross-sectional view of the spinal shaver provided by the embodiment of the present invention; Figure 4 is Figure 3 a partial enlarged schematic view of part A of Figure 5 is Figure 3 a partial enlarged schematic view of part B of Figure 6 a schematic structural view of the elastic bent pipe of the spinal shaver provided by an embodiment of the present invention Figure 1 ; Figure 7 a schematic structural view of the elastic bent pipe of the spinal shaver provided by an embodiment of the present invention Figure 2 ; Figure 8 a schematic structural view of the control component of the spinal shaver provided by an embodiment of the present invention; Figure 9 a schematic view of the partial structure at the rear end of the spinal shaver (with the box cover removed) provided by an embodiment of the present invention; Figure 10 a schematic view of the partial structure at the rear end of the spinal shaver (with the box cover and the reset plate removed) provided by an embodiment of the present invention; Figure 11 a schematic structural view of the box body of the spinal shaver provided by an embodiment of the present invention; Figure 12 a schematic view of the cooperation relationship between the lever and the first ratchet pawl of the spinal shaver provided by an embodiment of the present invention Figure 1 ; Figure 13 a schematic view of the cooperation relationship between the lever and the first ratchet pawl of the spinal shaver provided by an embodiment of the present invention Figure 2 ; Figure 14 a schematic structural view of the reset plate of the spinal shaver provided by an embodiment of the present invention; Figure 15 a schematic structural view of the inner knife assembly of the spinal shaver provided by an embodiment of the present invention.

[0026] Icons: 10 - spinal shaver; 11 - outer knife mechanism; 12 - control component; 14 - inner knife assembly; 110 - outer knife tube; 111 - C-shaped tube; 112 - sleeve; 113 - elastic bent pipe; 114 - outer joint; 120 - control box; 121 - lever; 122 - wire; 123 - ratchet; 124 - first ratchet pawl; 125 - second ratchet 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 implementation manners

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Components of the embodiments of the present invention usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0028] 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 claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0030] In addition, terms such as "first" and "second" are only used for descriptive distinction and cannot be construed as indicating or implying relative importance.

[0031] Please refer to Figures 1-3 As shown, an embodiment of the present invention provides a spinal curette 10 with adjustable bending angle. The spinal curette 10 can be applied to minimally invasive spinal surgery and can be used in combination with a surgical power device. Driven by the high-speed motor of the surgical power device, the spinal curette 10 can perform nucleus pulposus removal treatment.

[0032] Among them, the spinal curette 10 mainly consists of an outer blade assembly and an inner blade assembly 14, and 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 cooperation, but the outer blade assembly can be independently produced, manufactured, sold, used, etc. without relying on the inner blade assembly 14.

[0033] First of all, it should be noted that the orientations such as "front" and "rear" pointed out in this embodiment can be determined by the distance from the lesion site. For example, close to the lesion site is "front", and far from the lesion site is "rear". Of course, this orientation is not an absolute orientation but a relative orientation. In other embodiments, it is also possible that close to the lesion site is "rear" and far from the lesion site is "front".

[0034] Next, the specific structures of the outer blade assembly and the inner blade assembly 14 will be described in detail.

[0035] The outer knife assembly mainly consists 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, and the control assembly 12 is used to control whether the outer knife mechanism 11 bends and the bending amplitude.

[0036] The structure of the outer knife mechanism 11 is not limited and can refer to the prior art. Among them, please refer to Figures 3-7 As shown, the outer knife mechanism 11 at least includes an outer knife tube 110, an elastic bent tube 113 and an outer knife head. The elastic bent tube 113 is located between the outer knife tube 110 and the outer knife head.

[0037] The outer knife tube 110 is a tubular structure and can be a round tube, a square tube, an oval tube, etc. Its interior is hollow and both ends are open. The length of the outer knife tube 110 is not limited and can be set according to needs.

[0038] The rear end of the outer knife tube 110 can be detachably connected to the surgical power device. The outer knife tube 110 and the surgical power device can be directly connected or indirectly connected through an outer joint 114.

[0039] The elastic bent tube 113 is located at the front end of the outer knife tube 110. The elastic bent tube 113 can be a part of the outer knife tube 110, or the two can be independently arranged and connected. The connection method between the two is not limited, such as integrally formed, welded, bonded, interference fit, etc.

[0040] The elastic bent tube 113 can be a tubular structure, such as a round tube, a square tube, an oval tube, an irregular tube, etc.

[0041] Generally speaking, the outer knife tube 110 has a certain strength and cannot be bent, while the elastic bent tube 113 can be bent, that is, the elastic bent tube 113 can undergo elastic deformation. Under the action of an external force, the elastic bent tube 113 can bend or fold towards one side. Bending means that the elastic bent tube 113 bends into an arc shape, and folding means that the elastic bent tube 113 is divided into at least two straight-line segments, and the included angle between adjacent two segments can change. After the external force disappears, the elastic bent tube 113 can return to its original state.

[0042] The structure of the elastic bent tube 113 can refer to the prior art. In this embodiment, the following solutions can be adopted but are not limited to: The elastic bent tube 113 is provided with a plurality of circumferential through grooves 133, and the plurality of circumferential through grooves 133 are spaced apart in the front-rear direction.

[0043] The material of the elastic bent tube 113 is not limited and can be a metal material, a plastic material, etc.

[0044] Generally speaking, when there is no external force, the elastic elbow 113 is in a straight line, and the axis of the elastic elbow 113 coincides with the axis of the outer cutter tube 110. Of course, it is also possible that the elastic elbow 113 is slightly bent in the initial state or the axis of the elastic elbow 113 forms an angle with the axis of the outer cutter tube 110, etc.

[0045] The number of circumferential through grooves 133 is not limited, such as three, four, six, ten, etc. Generally speaking, the more the number of circumferential through grooves 133, the greater the maximum bending amplitude of the elastic elbow 113. On the contrary, the fewer the number of circumferential through grooves 133, the smaller the maximum bending amplitude of the elastic elbow 113. Assuming that the maximum bending angle of the elastic elbow 113 is 60°, then under the action of an external force, the bending angle of the elastic elbow 113 can be 0°, 10°, 20°, 30°, 40°, 50°, 60°, etc.

[0046] The circumferential through groove 133 refers to a strip-shaped notch extending along the circumference of the elastic elbow 113, and the central angle of the circumferential through groove 133 is not limited, such as 80°, 110°, 150°, 180°, 240°, etc. With such a setting, the strength of the elastic elbow 113 is reduced. Under the action of an external force, the two sides of the circumferential through groove 133 can be made to approach each other, and then the elastic elbow 113 can be bent towards one side.

[0047] The orientation of the circumferential through groove 133 is not limited. The orientation mentioned here refers to the orientation of the middle region of the circumferential through groove 133. Generally speaking, the orientation of at least two parts of the circumferential through grooves 133 is not limited. For example, in this embodiment, the multiple circumferential through grooves 133 are divided into several first through grooves and several second through grooves. Among them, the first through grooves face one side of the elastic elbow 113, and the second through grooves face the other side of the elastic elbow 113. The first through grooves and the second through grooves are staggered. With such a setting, the bending direction of the elastic elbow 113 is relatively fixed.

[0048] In other embodiments, the structure of the elastic elbow 113 can also adopt other technical solutions. For example: multiple circumferential through grooves 133 face the same side of the elastic elbow 113, the orientations of the multiple circumferential through grooves 133 are distributed in a spiral shape, in a quadrilateral shape, etc.; the elastic elbow 113 is provided with serrated spiral grooves, or the elastic elbow 113 is a plastic hose with a spiral steel wire built in, or the elastic elbow 113 adopts a snake bone structure that can be elastically reset. The snake bone structure means that the elastic elbow 113 includes several annular structures, and the adjacent two annular structures are hinged and the included angle between their axes can change. The elastic reset structure is not limited. For example, a torsion spring is arranged at the hinge, or an elastic plastic layer is covered on the outside of the snake bone structure, etc.

[0049] The outer cutter head is located at the front end of the elastic bent pipe 113. The connection method between the outer cutter head and the elastic bent pipe 113 is not limited. For example, they can be integrally formed, welded, bonded, interference-fitted, etc.

[0050] 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, etc., and the serrated structure can also be replaced with a blade, etc.

[0051] When the elastic bent pipe 113 bends towards one side, its front end can drive the outer cutter head to change its position, thereby changing the position of the outer cutter head, and further making the planing window adjacent to the lesion tissue to be planed.

[0052] The control component 12 is located at the rear end of the outer cutter mechanism 11. The control component 12 can be directly connected to the rear end of the outer cutter tube 110, or can be indirectly connected through other components, etc. The control component 12 is mainly used to control whether the elastic bent pipe 113 bends and to adjust the bending angle of the elastic bent pipe 113. Among them, please refer to Figures 8-14 As shown, the control component 12 includes a control box 120, a lever 121, a double-ratchet pawl mechanism, a wire 122 and a control member.

[0053] The control box 120 is connected to the rear end of the outer cutter tube 110. The connection method between the two is not limited. For example, they can be integrally formed, welded, bonded, interference-fitted, etc. In this embodiment, mounting through holes can also be provided on the control box 120, and the rear end of the outer cutter mechanism 11 passes through the mounting through holes.

[0054] The style of the control box 120 is not limited. It can be a boxed structure, a plate-like 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 snap connection, clamping connection, etc.

[0055] In other embodiments, the control box 120 does not include a box cover, or the box body and the box cover are an integral structure, which is also possible.

[0056] One end of the lever 121 is rotatably arranged on the control box 120. The rotational connection method between the two is not limited. For example, they are cooperated through a rotating shaft between them, or a cylindrical columnar part is provided in the control box 120, and one end of the lever 121 is rotatably sleeved on the columnar part, etc.

[0057] A part of the lever 121 extends out of the control box 120. The extension length of the lever 121 can be set as needed. The lever 121 can be rod-shaped, tubular, plate-shaped, sheet-shaped, etc. Medical staff can rotate the lever 121 by using the thumb or index finger, etc. The lever 121 is used to drive the double-ratchet pawl mechanism. Anti-slip lines can be provided on one side of the lever 121, and the anti-slip lines can play an anti-slip role.

[0058] The control box 120 is provided with a sector-shaped groove 127. The lever 121 passes through the sector-shaped groove 127 and a part of it is exposed outside the control box 120. The sector-shaped groove 127 can limit the rotation amplitude of the lever 121, so that when the lever 121 rotates, it has a first stop point and a second stop point, and the lever 121 can rotate between the first stop point and the second stop point. Of course, in other embodiments, it is also possible that the control box 120 is not provided with the sector-shaped groove 127.

[0059] The rotation direction of the lever 121 is not limited. For example, it can be pulled backward, forward, leftward, rightward, etc. In this embodiment, the rotation axis of the lever 121 extends in the left-right direction, and the lever 121 extends along the radial direction of the outer knife mechanism 11 and can be pulled backward. With such a setting, when the doctor holds the spinal shaver 10, the lever 121 matches the thumb, and the thumb can easily pull the lever 121 without affecting the other fingers to hold the spinal shaver 10. Of course, it is also possible for the doctor to pull the lever 121 with the index finger or the like.

[0060] In addition, a return torsion spring 126 can be provided between the lever 121 and the control box 120. The installation method of the return torsion spring 126 can refer to the prior art. For example, the return torsion spring 126 is sleeved on the rotation axis of the lever 121, and the two ends of the return torsion spring 126 are respectively abutted against the lever 121 and the control box 120. In this embodiment, the box body is provided with a central hole, a first sinking groove is provided outside the central hole, one end of the lever 121 is provided with a rotation axis hole, the rotation axis hole coincides with the axis of the central hole, a pin shaft is passed through the rotation axis hole and the central hole, and a second sinking groove is provided outside the rotation axis hole. The two ends of the return torsion spring 126 are respectively embedded in the first sinking groove and the second sinking groove.

[0061] The return torsion spring 126 makes the lever 121 have a tendency to rotate and reset, that is, the lever 121 has a first position and a second position: when the lever 121 is pulled by the thumb, the lever 121 can rotate from the first position to the second position; when the lever 121 is released, the return torsion spring 126 can drive the lever 121 to rotate and reset from the second position to the first position. With such a setting, after the doctor pulls the lever 121, he only needs to release the thumb, and the lever 121 can be reset to wait for the next pull. Of course, in other embodiments, instead of setting the return torsion spring 126, it is also possible to reset by pulling with the thumb.

[0062] The double-ratchet pawl mechanism is arranged in the control box 120. The double-ratchet pawl mechanism mainly consists of a ratchet wheel 123 and two pawls. The two pawls are respectively matched with the ratchet wheel 123, each pawl abuts against the ratchet wheel 123, and each pawl can make the ratchet wheel 123 rotate unidirectionally and be locked in the reverse direction.

[0063] The two pawls are arranged in the same direction. That is, under the action of the two pawls, the ratchet wheel 123 can still rotate in one direction and be locked in the reverse direction. For example, when any one or both pawls are pressed against the ratchet wheel 123, the ratchet wheel 123 can rotate clockwise and be locked counterclockwise, or can rotate counterclockwise and be locked clockwise.

[0064] For the convenience of description, the two pawls are respectively defined as the first pawl 124 and the second pawl 125. Among them, the first pawl 124 is rotatably arranged on the lever 121. When the lever 121 rotates, it can drive the first pawl 124 to rotate synchronously. The second pawl 125 is rotatably arranged in the control box 120.

[0065] When the lever 121 rotates from the first position to the second position, the lever 121 drives the first pawl 124 to rotate. The first pawl 124 can push the ratchet wheel 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 wheel 123 from rotating, and the ratchet wheel 123 rotates relative to the second pawl 125. When the lever 121 rotates from the second position to the first position, due to the fixed position of the second pawl 125, the second pawl 125 abuts against the ratchet wheel 123, and the ratchet wheel 123 cannot rotate in the reverse direction. Instead, the first pawl 124 can move in the reverse direction relative to the ratchet wheel 123. At this time, the lever 121 drives the first pawl 124 to return to its original position.

[0066] In order to prevent the pawls from moving abnormally, in this embodiment, each pawl is correspondingly provided with a compression spring 128. The compression spring 128 is used to press the pawl against the ratchet wheel 123. The compression spring 128 can be a compression spring or a tension spring, and its installation method can refer to the prior art. Taking the compression spring as an example: the two compression springs 128 are respectively defined as the first spring and the second spring. Among them, a limiting boss is provided at one end of the lever 121. The two ends of the first spring are respectively abutted against the first pawl 124 and the limiting boss. A second boss is provided in the control box 120. The two ends of the second spring are respectively abutted against the second pawl 125 and the second boss.

[0067] One end of the wire 122 is wound around the double-pawl ratchet mechanism and the other end is connected to the front end of the elastic bent pipe 113. Specifically, a winding part is coaxially arranged on the ratchet wheel 123. One end of the wire is wound around the winding part. When the ratchet wheel 123 rotates forward, it can make the rear end of the wire 122 wind around the winding part, so that the wire 122 moves backward, and further pulls the elastic bent pipe 113. Since the position of the rear end of the elastic bent pipe 113 is fixed, the elastic bent pipe 113 can only bend and deform toward one side. When the ratchet wheel 123 rotates in the reverse direction, the elastic bent pipe 113 recovers under its own elastic force, pulls the wire 122 to move forward, and further makes the ratchet wheel 123 rotate in the reverse direction, so that the part of the wire 122 wound around the ratchet wheel 123 is straightened.

[0068] The style or material of the wire drawing 122 can be different, and it can be in the form of a filament, a rope, a flexible tube, etc. A through hole can be provided at the front end of the box body, and the wire drawing 122 passes through the through hole and is located on one side of the flexible elbow 113.

[0069] The wire drawing 122 can be disposed inside the outer cutter tube 110, or other solutions can also be adopted. For example, the outer cutter mechanism 11 further includes a C-shaped tube 111 and a sleeve 112.

[0070] The cross-section of the C-shaped tube 111 is C-shaped and has an axial through groove for accommodating the wire drawing 122. The C-shaped tube 111 is sleeved on the outer cutter tube 110. The sleeve 112 is a tubular structure, and the sleeve 112 is sleeved on the C-shaped tube 111. The outer cutter tube 110, the C-shaped tube 111, and the sleeve 112 together form an axial channel, and the wire drawing 122 is disposed inside the axial channel and extends all the way to the flexible elbow 113. Moreover, an axial through hole or an axial groove can also be provided on the inner side of the flexible elbow 113, and the wire drawing 122 can pass through the axial through hole or the axial groove and be connected to the front end of the flexible elbow 113. Of course, in some embodiments, it is also possible to connect the flexible elbow 113 to the C-shaped tube 111 or the sleeve 112.

[0071] The control member is used to control the failure of the double-ratchet pawl mechanism. "The failure of the double-ratchet pawl mechanism" means that the double-ratchet pawl mechanism cannot fix the rear end of the wire drawing 122, that is, the elastic force of the flexible elbow 113 can pull the wire drawing 122 forward. When the wire drawing 122 is pulled forward, the wire drawing 122 can pull the ratchet 123 to rotate in the reverse direction.

[0072] The outer cutter assembly has a first state and a second state: when the outer cutter assembly is in the first state, the lever 121 can rotate and drive the ratchet 123 to rotate forward through the first ratchet pawl 124. The ratchet 123 pulls the wire drawing 122 backward, and the rear end of the wire drawing 122 is wound around the ratchet 123. The wire drawing 122 pulls the flexible elbow 113 to bend and deform toward one side. During this process, if the lever 121 is released, the lever 121 can reset, but the ratchet 123 is limited by the second ratchet pawl 125 and cannot reset; when the outer cutter assembly is in the second state, the control member causes the double-ratchet pawl mechanism to fail, and both ratchet pawls are disengaged from the ratchet 123. The flexible elbow 113 elastically resets and pulls the wire drawing 122 forward to drive the ratchet 123 to rotate in the reverse direction until the flexible elbow 113 returns to its original state.

[0073] The style of the control member is not limited. For example, a reset push button is provided on one side of the first ratchet pawl 124 and / or the second ratchet pawl 125. The reset push button extends out of the control box 120. When the doctor pushes the reset push button, the first ratchet pawl 124 and the second ratchet pawl 125 can be rotated, so that the first ratchet pawl 124 or the second ratchet pawl 125 is disengaged from the ratchet 123.

[0074] In this embodiment, the structure of the control member can adopt but is not limited to the following solutions: The control member includes a reset plate 129, and the reset plate 129 is in a plate-like structure or a block-like structure.

[0075] The reset plate 129 is movably arranged in the control box 120, and the reset plate 129 and the control box 120 can be in rotational fit, sliding fit, etc.

[0076] Taking the sliding fit as an example, the reset plate 129 can move along the axial direction of the central hole of the control box 120. Two wedge-shaped bosses 130 are arranged on the first side of the reset plate 129. The wedge-shaped bosses 130 are provided with wedge-shaped surfaces, and the wedge-shaped surfaces are in contact with or adjacent to the corresponding pawls. The wedge-shaped surfaces are inclined surfaces. The two wedge-shaped bosses 130 cooperate with the two pawls respectively, and they can be in contact. When the reset plate 129 is pushed and moves along the axial direction of the central hole, the wedge-shaped surface can squeeze and push the corresponding pawl to rotate, so that the pawl disengages from the ratchet wheel 123.

[0077] The reset plate 129 can be manually reset or elastically reset. In this embodiment, the reset plate 129 is elastically reset. Specifically, the control member further includes a reset spring 131. The reset spring 131 can be a compression spring or a tension spring, and its installation method can refer to the prior art. Taking the compression spring as an example, the reset spring 131 is located between the reset plate 129 and the control box 120, and both ends of the reset spring 131 are in contact with the reset plate 129 and the control box 120 respectively. The reset spring 131 makes the reset plate 129 tend to move away from the pawl.

[0078] In addition, a pressing boss 132 can also be arranged on the second side of the reset plate 129. The pressing boss 132 protrudes from one side of the control box 120, and the style of the pressing boss 132 is not limited. For example, a circular pressing boss 132, a square pressing boss 132, etc. The doctor only needs to press the pressing boss 132 with the thumb or index finger, etc., to push the reset plate 129 to move, and then the wedge-shaped boss 130 can push the pawl open.

[0079] The structure of the inner knife assembly 14 can refer to the prior art. In this embodiment, it can adopt but is not limited to the following solutions: Please refer to Figure 15 As shown, the inner knife assembly 14 includes an inner knife tube 140, a connecting portion 141 and an inner knife head 142.

[0080] Among them, the inner knife tube 140 can be in a tubular structure or a rod-like structure, such as a circular tube, a square tube, a solid rod, etc.

[0081] The inner cutter tube 140 is disposed inside the outer cutter tube 110. The outer diameter of the inner cutter tube 140 is smaller than the inner diameter of the outer cutter tube 110. The rear end of the inner cutter tube 140 is used for detachably connecting to a surgical power device, and the surgical power device can drive the inner cutter tube 140 to rotate around its own central axis. A direct connection can be established between the inner cutter tube 140 and the surgical power device, or an indirect connection can be achieved through an inner joint 143.

[0082] The connecting portion 141 is located at the front end of the inner cutter tube 140. The connecting portion 141 corresponds to the elastic bent tube 113 of the outer cutter mechanism 11, that is, the connecting portion 141 is located inside the elastic bent tube 113. Generally speaking, the length of the connecting portion 141 is greater than the length of the elastic bent tube 113. Of course, it is also acceptable if the length of the connecting portion 141 is smaller than the length of the elastic bent tube 113.

[0083] Both ends of the connecting portion 141 are respectively connected to the inner cutter tube 140 and the inner cutter head 142. The structure of the connecting portion 141 is not limited, and it is required to be able to bend and deform while also being able to transmit torque. In this embodiment, the connecting portion 141 is provided with a serrated spiral groove and can be bent at any angle. In other embodiments, the spiral groove can also be in a spiral line structure.

[0084] When the surgical power device drives the inner cutter tube 140 to rotate, the connecting portion 141 can rotate along with the inner cutter tube 140. And during a certain period of time, the bending angle of the elastic bent tube 113 remains unchanged. Under the restriction of the elastic bent tube 113, the connecting portion 141 can bend. The inner cutter head 142 is disposed at the front end of the connecting portion 141. The structure of the inner cutter head 142 can refer to the prior art. For example, one side of the inner cutter head 142 is provided with a serrated structure, and the serrated structure matches the position of the shaving window. That is, when the serrated structure of the inner cutter head 142 rotates to the shaving window, the lesion site located at the shaving window can be excised.

[0085] In some embodiments, the inner cutter tube 140, the connecting portion 141, and the inner cutter head 142 can all adopt a hollow structure and be interconnected. The rear end of the inner cutter tube 140 can be connected to a suction device, and the suction device can extract the shaved waste tissue. Of course, it is also possible to extract the shaved waste tissue through the gap between the inner cutter assembly 14 and the outer cutter mechanism 11 or through other devices.

[0086] The working principle of the spinal shaver 10 provided in this embodiment is as follows: Insert the inner cutter assembly 14 into the outer cutter mechanism 11; Connect the spinal shaver 10 to the surgical power device. Herein, the rear end of the outer cutter tube 110 is connected to the fixed part of the surgical power device through the outer joint 114, the rear end of the inner cutter tube 140 is connected to the high-speed motor of the surgical power device through the inner joint 143, and the rear end of the inner cutter assembly 14 can be driven by the high-speed motor to rotate; Insert the spinal shaver 10 into the instrument channel of the intervertebral foraminal endoscope until the spinal shaver 10 is inserted in place, that is, the outer cutter head and the inner cutter head 142 are adjacent to the nucleus pulposus or other tissues to be resected. During this process, the spinal shaver 10 is in a straight state; Adjust the bending angle of the spinal shaver 10. In this state, the doctor usually holds the intervertebral foraminal endoscope with one hand and the spinal shaver 10 with the other hand. At this time, the doctor can use the index finger or thumb of the hand holding the spinal shaver 10 to flick the lever 121. The lever 121 drives the first ratchet pawl 124 to rotate. The first ratchet pawl 124 pushes the ratchet wheel 123 to rotate. The rear end of the wire 122 is wound around the ratchet wheel 123, and then pulls the elastic bend pipe 113 to bend towards one side; The doctor releases the lever 121. The lever 121 rotates in the reverse direction under the action of the return torsion spring 126 until it returns to its original position. During this process, the second ratchet pawl 125 abuts against the ratchet wheel 123 to prevent the ratchet wheel 123 from rotating in the reverse direction; The doctor continues to flick the lever 121, so as to increase the bending angle of the elastic bend pipe 113; Repeat the above steps until the bending amplitude of the elastic bend pipe 113 reaches the expectation. At this time, the cutting window of the outer cutter head is adjacent to the lesion tissue; Start the surgical power device. The high-speed motor drives the inner cutter assembly 14 to rotate at a high speed. The inner cutter head 142 rotates at a high speed inside the outer cutter head. The two cooperate with each other to resect the nucleus pulposus or other tissues. The resected nucleus pulposus or other tissues can be evacuated from the inside of the inner cutter tube 140; When it is necessary to take out the spinal shaver 10, press the pressing boss 132 of the reset plate 129 with the thumb or index finger, etc., to push the reset plate 129 to move axially along the central hole. The wedge-shaped boss 130 of the reset plate 129 squeezes the first ratchet pawl 124 and the second ratchet pawl 125, so that the first ratchet pawl 124 and the second ratchet pawl 125 are respectively disengaged from the ratchet wheel 123. The elastic bend pipe 113 resets and straightens under its own elastic action. During this process, the ratchet wheel 123 can be pulled to rotate in the reverse direction through the wire 122; After the spinal shaver 10 is straightened, release the pressing boss 132. The reset plate 129 resets under the action of the reset spring 131, and the first ratchet pawl 124 and the second ratchet pawl 125 can re-abut against the ratchet wheel 123; Take out the spinal shaver 10 in the straightened state.

[0087] The above steps can be increased, decreased, modified, adjusted in order, etc. 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.

[0088] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An outer knife assembly, comprising an outer knife mechanism having an elastic curved tube and a control assembly located at the rear end thereof; characterized in that: The control assembly includes a control box, a lever, a double-pawl ratchet mechanism, a wire drawing and a control component. The lever is rotatably arranged on 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 bent pipe. The control component is used to control the double-pawl ratchet mechanism to fail.

2. The outer knife assembly according to claim 1, characterized in that: The double-pawl ratchet mechanism comprises 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.

3. The outer knife assembly according to claim 1, characterized in that: A return torsion spring is arranged between the shifting rod and the control box, and the return torsion spring enables the shifting rod to have a tendency to rotate and return.

4. The outer knife assembly according to claim 1, characterized in that: The control box is provided with a fan-shaped groove, and the shifting rod passes through the fan-shaped groove and a part of the lever is exposed from the control box.

5. The outer knife assembly according to claim 2, characterized in that: Each of the ratchet pawls is correspondingly provided with a compression spring, and the compression spring presses the ratchet pawl onto the ratchet wheel.

6. The outer knife assembly according to claim 2, characterized in that: The control member comprises a reset plate, which is movably arranged on the control box and has two wedge-shaped bosses on a first side. The two wedge-shaped bosses respectively cooperate with the two pawls and can push the pawls to disengage from the ratchet.

7. The outer knife assembly according to claim 6, characterized in that: The control member further comprises a return spring, which tends to move the return plate away from the pawl.

8. The outer knife assembly according to claim 1, characterized in that: The outer knife mechanism also 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. The sleeve is sleeved on the C-shaped tube.

9. The outer knife assembly according to claim 1, characterized in that: The control box comprises a box body and a box cover, and the box body and the box cover are detachably connected.

10. A spinal planer with adjustable bending angle, characterized in that: It comprises an inner knife assembly and an outer knife assembly according to any one of claims 1 to 9, wherein the inner knife assembly is inserted into the outer knife mechanism.

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