Femoral condyle accessory handheld device
The femoral condyle accessory handheld device, designed with a mirrored arm hook and forward and reverse toothed rods, solves the problems of interference and obstruction during the installation of femoral condyle accessories, achieving a more stable and efficient installation operation and improving surgical efficiency.
Patent Information
- Application Number
- CN202423099096.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-16
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2034-12-16
AI Technical Summary
Existing femoral condyle accessory installers are prone to interference and obstruction during installation, limiting the installation angle, distance, and contact area, resulting in greater operational difficulty and affecting surgical progress.
The arm hook and the positive and negative threaded rod design with mirrored settings allow the arm hook to clamp the left and right and front and back sides of the femoral condyle accessory by opening and closing. The spacer block and the arm hook are used for clamping to avoid interference, enhance stability and connection strength, and reduce the difficulty of operation.
It improves the installation stability and connection strength of femoral condyle accessories, reduces the difficulty of operation, increases the success rate of single operation, and promotes surgical progress.
Smart Images
Figure CN223900879U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the medical tooling field of femoral condyle auxiliary part, especially a kind of hand-held device of femoral condyle auxiliary part. BACKGROUND
[0002] Femur is the important component bone block of lower limb skeleton, its upper end is connected with hip bone, lower end is connected with the upper end of tibia, and it is together with patella between femur and tibia to form knee joint skeleton, wherein, the lower end of femur is femoral condyle, femoral condyle is curved surface structure, provides movement degree of freedom for knee joint to flex and extend, also just because femoral condyle is part of movable joint, it is more easily damaged and damaged under the condition of movement damage, external force impact and overuse, when femoral condyle produces more serious damage and damage, femoral condyle prosthesis needs to be implanted to replace original femoral condyle, and the implanted femoral condyle prosthesis also needs to be replaced and re-implanted after being damaged or long-term use, to avoid affecting the reciprocating flexion and extension of knee joint and the standing and walking of lower limb.
[0003] Before femoral condyle prosthesis is implanted, femoral condyle test mould of similar size and specification to original femoral condyle needs to be selected from different size specifications of femoral condyle test mould, and temporarily installed on the lower end of femur one by one, and the most matched femoral condyle test mould and the femoral condyle prosthesis corresponding to the specification and size of the femoral condyle test mould are selected by installing femoral condyle test mould of different specifications and sizes on femur to compare, finally the corresponding femoral condyle prosthesis is installed on the lower end of femur, and the implantation of femoral condyle prosthesis is completed.
[0004] And the above-mentioned femoral condyle test mould and femoral condyle prosthesis are collectively referred to as femoral condyle auxiliary part, when installing femoral condyle auxiliary part, since femoral condyle auxiliary part is curved structure, plus installation space and angle are limited, femoral condyle auxiliary part needs to be fixed on holder. Among them, the current holder is mostly controlled by forward and reverse toothed rod to open and close a pair of clamping arms on handle, and the left and right sides of femoral condyle auxiliary part are clamped by clamping arms, and a clamping plate is arranged between the two clamping arms, the clamping plate is connected with the handle through a screw rod transmission mechanism, and the inner and outer sides of femoral condyle auxiliary part are clamped by the clamping plate and the handle under the adjustment of the screw rod transmission mechanism, and the left and right, inner and outer sides of femoral condyle are clamped, and the relative fixation with holder is completed. But since screw rod transmission mechanism is located between the two clamping arms, it will interfere and hinder femoral condyle auxiliary part which is also between the two clamping arms, limit the installation angle, installation distance and contact area of femoral condyle auxiliary part on holder, thereby affecting the stability and connection strength of relative fixation. In addition, the inner side of femoral condyle auxiliary part is opposite to the lower end of femur, and the outer side is opposite to the operator, when holder is connected with femoral condyle auxiliary part, the curved structure of femoral condyle auxiliary part is difficult to make femoral condyle auxiliary part from the handle and the clamping plate into and detach, which leads to large operation difficulty, low single success rate and easy to affect operation progress. The utility model discloses a content
[0005] The utility model discloses a femoral condyle auxiliary part hand -held ware, realize the ware to avoid with the interference and the obstruction of femoral condyle auxiliary part, can clamp the left and right and the front and back two sides of femoral condyle auxiliary part simultaneously, and reduce the operation difficulty of relative fixed and disengagement with femoral condyle auxiliary part.
[0006] The utility model discloses a technical scheme for: femoral condyle auxiliary part hand -held ware, including handle and two mirror image settings arm hook, one end of handle is provided with the installation slot, the both ends of installation slot are open setting, the first end of two arm hook all are located in installation slot, be equipped with the positive and negative toothed rod that can be rotated in installation slot, the both ends of positive and negative toothed rod with two arm hook one -one correspondence setting, the first end of arm hook with corresponding end portion of positive and negative toothed rod thread connection in the mode of adjustable along the axial direction of positive and negative toothed rod, and with installation slot sliding cooperation, the second end of arm hook is located outside installation slot, and with the first end of arm hook forms the bayonet joint that opens to adjacent arm hook in common, the second end of arm hook is located outside installation slot, and with the first end of arm hook forms the bayonet joint that opens to adjacent arm hook in common, and the both sides of two bayonet joint are equipped with the pad, the pad is fixedly connected on arm hook, and is equipped with the interval for the card of femoral condyle auxiliary part between the second end of arm hook and arm hook.
[0007] In the above-mentioned femoral condyle auxiliary part hand -held ware, the arc surface for fitting the femoral condyle auxiliary part is arranged on the pad in a concave structure, and the arc surface is located on one side of the pad opposite to the second end of the arm hook.
[0008] In the above-mentioned femoral condyle auxiliary part hand -held ware, the width of the arm hook gradually decreases from the middle of the arm hook to the second end of the arm hook, and the edges of the opposite sides of the pad are chamfered, and the chamfers on both sides correspond to and face the edges of the width of the arm hook.
[0009] In the above-mentioned femoral condyle auxiliary part hand -held ware, a guide groove is formed in the inner side of the side wall of the installation slot, and a guide rail is arranged on the first end of each arm hook and slidably connected with the guide groove.
[0010] In the above-mentioned femoral condyle auxiliary part hand -held ware, a knob is arranged on the middle of the positive and negative toothed rod, the knob is fixedly connected with the positive and negative toothed rod, and the edge of the knob penetrates the side wall of at least one side of the installation slot and is arranged outside the installation slot.
[0011] In the above-mentioned femoral condyle auxiliary part hand -held ware, the pad is a soft plastic block.
[0012] In the above-mentioned femoral condyle auxiliary part hand -held ware, a handle cap for knocking is arranged on the other end of the handle, and the handle cap extends outward along the radial direction of the handle.
[0013] In the femoral condyle auxiliary part hand-held device, a knob is fixedly connected to one end of the reverse toothed screw rod and located outside the mounting groove.
[0014] In the femoral condyle auxiliary part hand-held device, a connecting part of the knob is sleeved on the reverse toothed screw rod, the connecting part is fixedly connected with the reverse toothed screw rod, a notch is formed in the first end of the arm hook and faces the connecting part, and the connecting part is arranged in the notch.
[0015] In the femoral condyle auxiliary part hand-held device, the side surfaces adjacent to the first end of the arm hook and the knob are inclined surfaces matched with each other.
[0016] The femoral condyle auxiliary part hand-held device has the following beneficial effects after the above technical scheme is adopted.
[0017] The two arm hooks in the technical scheme are mirror images arranged in the mounting groove of the handle, the reverse toothed screw rod in the mounting groove controls the two arm hooks to move closer to each other and move away from each other through screw rod transmission, the arm hooks can clamp the left and right sides of the femoral condyle auxiliary part in an opening and closing manner, the bayonet is formed between the first end and the second end of the arm hook, when the arm hook clamps the femoral condyle auxiliary part, the left and right sides of the femoral condyle auxiliary part are in the bayonet, the pad is further arranged in the bayonet, the pad is fixedly connected with the arm hook and is arranged in a spaced manner with the second end of the arm hook, the femoral condyle auxiliary part is in the bayonet and is clamped between the pad and the second end of the arm hook, the pad and the second end of the arm hook interact with each other and clamp the inner and outer sides of the femoral condyle auxiliary part together, so that the two arm hooks can clamp the left and right sides of the femoral condyle test model and clamp the inner and outer sides of the femoral condyle after moving closer to each other, mutual interference and obstruction of the femoral condyle auxiliary part are avoided due to the additional components between the two arm hooks, the installation angle, the installation distance and the contact area of the femoral condyle auxiliary part fixed on the hand-held device are released, the stability and the connection strength of relative fixation are enhanced, the operation difficulty of relative fixation and disconnection of the femoral condyle auxiliary part and the hand-held device is reduced, the single operation success rate is improved, and the operation progress is accelerated. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 is a structural schematic view of the femoral condyle auxiliary part hand-held device of the embodiment 1 of the utility model;
[0019] Figure 2 is an exploded view of the femoral condyle auxiliary part hand-held device of the embodiment 1 of the utility model;
[0020] Figure 3 is a use effect view of the femoral condyle auxiliary part hand-held device of the embodiment 1 of the utility model;
[0021] Figure 4 is the Figure 3 is a local enlarged view of A.
[0022] Reference numerals: 1. Handle; 2. Arm hook; 3. Pad; 4. Knob; 5. Ring; 6. Threaded rod (forward and reverse); 7. Inclined surface; 8. Femoral condyle accessory;
[0023] 11. Handle cap; 12. Mounting slot; 121. Guide slot; 13. Weight reduction part;
[0024] 21. Guide rail; 22. Notch; 31. Curved surface; 32. Chamfer;
[0025] 41. Connecting part; 81. Bayonet. Detailed Implementation
[0026] The technical solution of this utility model will be further described in detail below with reference to specific embodiments, but this does not constitute any limitation on this utility model.
[0027] Example 1:
[0028] like Figures 1-4 As shown, the femoral condyle accessory handheld device includes a handle 1 and two arm hooks 2 arranged in a mirror image of each other. One end of the handle 1 has a mounting groove 12, and both ends of the mounting groove 12 are open. The first ends of the two arm hooks 2 are both located in the mounting groove 12. The mounting groove 12 is provided with a rotatable positive and negative threaded rod 6. The two ends of the positive and negative threaded rod 6 are correspondingly arranged with the two arm hooks 2. The first end of the arm hook 2 is threadedly connected to the corresponding end of the positive and negative threaded rod 6 in an adjustable manner along the axial direction of the positive and negative threaded rod 6, and slides in fit with the mounting groove 12. The second end of the arm hook 2 is located outside the mounting groove 12, and together with the first end of the arm hook 2, forms a bayonet 81 that opens toward the adjacent arm hook 2. Both bayonet 81 are provided with a pad 3, which is fixedly connected to the arm hook 2, and there is a gap between the pad 3 and the second end of the arm hook 2 for locking the femoral condyle accessory 8.
[0029] Its working principle is as follows: two arm hooks 2 are mirror-mounted in the mounting groove 12 of the handle 1. The positive and negative threaded rods 6 in the mounting groove 12 control the two arm hooks 2 to move closer and further apart through threaded rod transmission, so that the arm hooks 2 can clamp the left and right sides of the femoral condyle accessory 8 in an opening and closing manner. A locking slot 81 is formed between the first end and the second end of the arm hook 2. When the arm hook 2 clamps the femoral condyle accessory 8, the left and right sides of the femoral condyle accessory 8 are within the locking slot 81. A pad 3 is also provided in the locking slot 81. The pad 3 is fixedly connected to the arm hook 2 and is spaced apart from the second end of the arm hook 2. While the femoral condyle accessory 8 is within the locking slot 81, it is also clamped between the pad 3 and the arm hook 2. Between the two ends, the pad 3 and the second end of the arm hook 2 interact to clamp the inner and outer sides of the femoral condyle accessory 8. This allows the two arm hooks 2 to clamp both the left and right sides of the femoral condyle mold and the inner and outer sides of the femoral condyle after they come together. This avoids interference and obstruction between the two arm hooks 2 and the femoral condyle accessory 8 due to the addition of components between them. It also removes the limitations on the installation angle, installation distance, and contact area of the femoral condyle accessory 8 on the holder, enhances the stability and connection strength of the relative fixation, and reduces the difficulty of fixing and detaching the femoral condyle accessory 8 from the holder. This increases the success rate of a single operation and accelerates the progress of the surgery.
[0030] Combination Figure 1 and Figure 2 As shown, preferably, the pad 3 is provided with an arc surface 31 with an inwardly concave structure for fitting the femoral condyle accessory 8, and the arc surface 31 is located on the side of the pad 3 facing the second end of the arm hook 2.
[0031] Another preferred embodiment is that the width of the arm hook 2 gradually decreases from the middle of the arm hook 2 to the second end of the arm hook 2, and the edges of the opposite sides of the pad block 3 are provided with chamfers 32, and the chamfers 32 on both sides correspond one-to-one with the edges of the width of the arm hook 2 and are directly opposite each other.
[0032] In actual setup, the width direction of the hook 2 is specifically formed on both radial horizontal sides of the positive and negative threaded screw 6. This direction is perpendicular to both the axial direction of the screw and the axial direction of the handle 1.
[0033] The reduction in the width of the arm hook 2 allows it to avoid human tissue covering the knee joint or reduce contact with human tissue during surgery; similarly, the chamfer 32 on the pad 3 can also avoid human components or reduce contact with human tissue.
[0034] like Figure 2 As shown, in the preferred embodiment, a guide groove 121 is provided on the inner side of the side wall of the mounting groove 12, and a guide rail 21 that slides with the guide groove 121 is provided on the first end of each of the two arm hooks 2.
[0035] The guide rail 21 on the arm hook 2 is arranged in the guide groove 121 of the mounting groove 12 and is in sliding fit with the guide groove 121 along the extension direction of the mounting groove 12, that is, the arm hook 2 is guided to move not only by the sliding fit between the outer side wall of the arm hook 2 and the inner side wall of the mounting groove 12, but also by the sliding fit between the guide groove 121 and the mounting groove 12, thereby improving the moving stability and precision of the arm hook 2 in the mounting groove 12.
[0036] In specific applications, the guide groove 121 can be arranged on only one side wall of the mounting groove 12 or on both side walls of the mounting groove 12. Correspondingly, the guide rail 21 on the arm hook 2 is arranged on only one side of the arm hook 2 or on both sides of the arm hook 2.
[0037] In combination with Figure 1 and Figure 2 As shown in the drawings, in the embodiment, the middle part of the reversible toothed lead screw 6 is sleeved with a knob 5, the knob 5 is fixedly connected with the reversible toothed lead screw 6, the edge of the knob 5 penetrates through at least one side wall of the mounting groove 12 and is arranged outside the mounting groove 12.
[0038] In actual use, the edge of the knob 5 penetrates through the side wall of the mounting groove 12 and is exposed outside the mounting groove 12, and the knob 5 is reversely rotated by being pushed, thereby reversely rotating the reversible toothed lead screw 6 and indirectly moving the arm hooks 2 to approach each other or move away from each other.
[0039] The outer circumferential surface of the knob 5 is provided with a recess and / or a convex part for preventing the fingers from slipping off.
[0040] As a preferred scheme of the embodiment, the edge of the knob 5 penetrates through the side walls of the mounting groove 12 on both sides, and the edges of the knob 5 on the diametrically opposite sides are respectively exposed outside the corresponding side of the mounting groove 12, so that the operator can push the knob 5 from above the holder regardless of whether the holder is in a normal position or a reversed position, and the holder is convenient to use.
[0041] Further preferably, the cushion block 3 is a soft plastic block, preferably a PP plastic block, which is safe and harmless and has a certain strength and will not be weakened by being penetrated by the nails or bolts, so that the cushion block 3 is extremely convenient and fast to be fixed and mounted.
[0042] It should be noted that in the general plastic industry, soft glue is a general term for plastics such as PP and PE which have a relatively low specific gravity and a relatively low surface hardness.
[0043] In combination with Figure 1 and Figure 2As shown, further improvement, the opposite end of the handle 1 is provided with a handle cap 11 for knocking, the handle cap 11 extends radially outward along the handle 1.
[0044] The provision of the handle cap 11 increases the end area of the handle 1 and forms a force point with relatively large knocking area. In specific use, when the femoral condyle auxiliary part 8 is installed on the lower end of the femur, the handle cap 11 is knocked from the side away from the handle 1 towards the side adjacent to the femoral condyle auxiliary part 8 by using a hammer, and under the transmission of force, the femoral condyle auxiliary part 8 is rapidly pushed forward by using instantaneous impact force, and when the femoral condyle auxiliary part 8 is removed from the lower end of the femur, the handle cap 11 is knocked from the side adjacent to the femoral condyle auxiliary part 8 towards the side away from the handle 1 by using a hammer, and the femoral condyle auxiliary part is also pushed out by using instantaneous impact force. Therefore, when the hand-held device is used to install or remove the femoral condyle auxiliary part 8, the handle cap 11 can avoid the operation defects that the hand cannot exert force and needs to exert force for a long time.
[0045] In actual assembly, the end of the handle 1 away from the mounting groove 12 is provided with a key block, which is inserted on the handle cap 11 and fixedly connected with the handle cap 11. The key block is a rectangular protrusion, which is inserted on the handle cap 11 and fixedly connected by laser welding.
[0046] In combination Figure 1 and Figure 2 As shown, further improvement of the embodiment, the end of the positive and negative toothed rod 6 is fixedly connected with the knob 4 outside the mounting groove 12.
[0047] In this embodiment, in addition to being able to drive the positive and negative toothed rod 6 through the ring 5, the knob 4 can also be used to drive the positive and negative toothed rod 6 to rotate. The ring 5 and the knob 4 can be installed on the positive and negative toothed rod 6 alternatively or all at the same time, and the embodiment does not make too many limitations on this.
[0048] Among them, the knob 4 not only has the function of driving the positive and negative toothed rod 6 to rotate, but also has the function of limiting the arm hook 2. When the arm hook 2 adjacent to the knob 4 on the positive and negative toothed rod 6 gradually approaches the knob 4 until it abuts against the knob 4, the arm hook 2 reaches the maximum stroke and cannot continue to move, and at the same time, it reacts on the positive and negative toothed rod 6, so that the positive and negative toothed rod 6 cannot continue to rotate. In the case that the positive and negative toothed rod 6 cannot continue to rotate, the other arm hook 2 also stops moving synchronously and cannot continue to move, avoiding the two arm hooks 2 from falling off the positive and negative toothed rod 6.
[0049] As a further improvement of the embodiment, the knob 4 and the dial ring 5 are both mounted on the reverse thread screw rod 6, so that the operator can operate with one hand or both hands. In the specific one-handed operation, the operator can hold the holder with one hand and the femoral condyle auxiliary part 8 with the other hand. After aligning the femoral condyle auxiliary part 8 with the holder, the operator can preliminarily clamp the femoral condyle auxiliary part 8 by rotating the dial ring 5 with the thumb, and finally clamp the femoral condyle auxiliary part 8 by rotating the knob 4.
[0050] The threads at both ends of the reverse thread screw rod 6 are preferably trapezoidal threads. The reverse thread screw rod 6 with trapezoidal threads has high load capacity and will not deform or jam during the process of knocking the holder. In addition, the reverse thread screw rod 6 has good self-locking property, so that the two arm hooks 2 will not loosen after clamping the femoral condyle prosthesis due to knocking the holder. In addition, the reverse thread screw rod 6 has high transmission capacity, so that the operator can accurately adjust the position and transmit the force without generating large resistance when rotating the knob 4 and the dial ring 5, thereby avoiding the jamming phenomenon.
[0051] The specific connection mode of the knob 4 and the reverse thread screw rod 6 is that the knob 4 is provided with a connecting part 41 which is sleeved on the reverse thread screw rod 6, and the connecting part 41 is fixedly connected with the reverse thread screw rod 6. The first end of the arm hook 2 is provided with a notch 22 which is opposite to the connecting part 41, and the connecting part 41 is arranged in the notch 22.
[0052] In the specific assembly of the knob 4 and the arm hook 2, the first end of the arm hook 2 and the side surface adjacent to the knob 4 are inclined surfaces 7 which are matched with each other.
[0053] The provision of the notch 22 and the inclined surface 7 reduces the overall width of the holder and the occupied space of the holder, so that the manual operation is more flexible and convenient.
[0054] As shown in Figure 3 some embodiments, the holder 1 is provided with a weight-reducing part 13 which can be a hole or a slot. The embodiment does not make too many limitations on this.
[0055] As shown in Figure 3 and Figure 4 some embodiments, the femoral condyle auxiliary part 8 is provided with a bayonet 81 on the left and right sides thereof. When the two arm hooks 2 clamp the femoral condyle auxiliary part 8, the second end of the arm hook 2 is inserted into the bayonet 81. The bayonet 81 on the femoral condyle auxiliary part 8 provides positioning and clamping for the arm hook 2, thereby improving the accuracy, stability and connection strength of the relative fixation of the holder and the femoral condyle auxiliary part 8.
[0056] The specific assembly process of the gripper is that the push ring 5 is arranged in the mounting groove 12, the right-and-left thread rod 6 is inserted into the push ring 5, the positioning pins are punched on the push ring 5 and the right-and-left thread rod 6, and the positioning pins are welded with the push ring 5. The left arm hook 2 is right thread, the right arm hook 2 is left thread, the left arm hook 2 and the right arm hook 2 are symmetrically arranged on the right-and-left thread rod 6, the push ring 5 is pushed to drive the right-and-left thread rod 6 to rotate, the trapezoidal thread on the arm hook 2 is matched with the right-and-left thread rod 6, the arm hook 2 is moved by the right-and-left thread rod 6, the left and right arm hooks 2 are screwed into the middle part of the right-and-left thread rod 6, then the knob 4 is sleeved on one end of the right-and-left thread rod 6, the positioning pins are punched on the knob 4 and the right-and-left thread rod 6, the positioning pins and the knob 4 are welded, finally the pads 3 are fixed on the corresponding arm hooks 2 through the positioning pins, and the positioning pins and the arm hooks 2 are welded.
[0057] The above embodiment is a preferred embodiment of the present application, but the embodiment of the present application is not limited by the above embodiment, and any change, modification, replacement, combination and simplification made without departing from the spirit and principle of the present application should be an equivalent replacement mode, and all are included in the protection scope of the present application.
Claims
1. A femoral condyle prosthesis handpiece comprising a handle and two mirror image arm hooks, characterised in that, One end of the handle is provided with a mounting groove, two ends of the mounting groove are provided in an open manner, the first ends of the two arm hooks are arranged in the mounting groove, a reversible toothed rod capable of rotating is arranged in the mounting groove, the two ends of the reversible toothed rod are arranged in a one-to-one correspondence with the two arm hooks, the first end of the arm hook is threadedly connected with the corresponding end of the reversible toothed rod in a manner capable of being adjusted along the axial direction of the reversible toothed rod, and is in sliding fit with the mounting groove, the second end of the arm hook is arranged outside the mounting groove and forms a bayonet opening towards the adjacent arm hook together with the first end of the arm hook, a pad is arranged in each of the two bayonets, the pad is fixedly connected to the arm hook, and a space for clamping a femoral condyle auxiliary part is arranged between the pad and the second end of the arm hook.
2. The femoral condyle facet handpiece of claim 1, wherein, The pad is provided with a concave arc surface for fitting the femoral condyle auxiliary part, and the arc surface is located on the side of the pad opposite to the second end of the arm hook.
3. The femoral condyle facet handpiece of claim 1, wherein, The width of the arm hook gradually decreases from the middle of the arm hook to the second end of the arm hook, and the edges of the opposite sides of the pad are chamfered, and the chamfers on the two sides correspond to and face the edges of the width of the arm hook.
4. The femoral condyle facet handpiece of claim 1, wherein, A guide groove is formed in the inner side of the side wall of the mounting groove, and a guide rail in sliding fit with the guide groove is arranged on the first end of each of the two arm hooks.
5. The femoral condyle facet handpiece of claim 1, wherein, A knob is arranged on the middle of the reversible toothed rod, the knob is fixedly connected with the reversible toothed rod, and the edge of the knob penetrates the side wall of at least one side of the mounting groove and is arranged outside the mounting groove.
6. The femoral condyle augment handpiece according to any one of claims 1-5, wherein, The pad is a soft plastic block.
7. The femoral condyle augment handpiece according to any one of claims 1-5, wherein, The opposite end of the handle is provided with a handle cap for knocking, and the handle cap extends outward along the radial direction of the handle.
8. The femoral condyle augment handpiece according to any one of claims 1-5, wherein, One end of the reversible toothed rod is fixedly connected with a knob arranged outside the mounting groove.
9. The femoral condyle facet handpiece of claim 8, wherein, The knob is provided with a connecting portion arranged on the reversible toothed rod, the connecting portion is fixedly connected with the reversible toothed rod, the first end of the arm hook is provided with a notch facing the connecting portion, and the connecting portion is arranged in the notch.
10. The femoral condyle facet handpiece of claim 8, wherein, The side surfaces adjacent to each other of the first end of the arm hook and the knob are inclined surfaces matched with each other.