Femoral reference frame

Abstract

The utility model belongs to the technical field of medical instruments, and particularly relates to a femur reference frame which is mainly used in robot-assisted total knee arthroplasty and is mounted on a femur of a patient, so that a robot can accurately identify and position the femur. The fixing part is provided with a first axis in the height direction; the connecting rod is provided with a first end and a second end, the first end is connected with the fixing part, the second end is located above the first end in the extending direction of the first axis, and the distance between the second end and the first axis is larger than that between the first end and the first axis; the reference frame is arranged on one side of the connecting rod, and the distance between the reference frame and the first end is larger than that between the reference frame and the second end; the problems that when an existing reference frame is installed on the femur of a patient, a surgical incision needs to be increased or lengthened, and movement of a mechanical arm of a surgical robot is hindered are mainly solved.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, specifically relating to a femoral reference frame. Background Technology

[0002] During robot-assisted total knee arthroplasty, a femoral reference frame is required to facilitate accurate identification and positioning of the femur by the robot. Existing reference frame connectors are straight rods; placing them inside the incision would prolong the incision and increase bleeding. Alternatively, an additional incision could be made away from the femoral osteotomy area to place the reference frame. This extra incision would further increase bleeding and, being closer to the perineum, increase the risk of infection.

[0003] There are two main placement methods for the existing femoral reference frame: one is outside the incision, located 4 finger widths above the patella and 10mm medially, which requires an additional incision in the patient's thigh; the other is inside the incision, located on the anterior cortex of the femoral condyle. However, in this method, the incision needs to be extended to avoid interference with the robotic arm. Both methods increase the risk of bleeding and infection. Furthermore, the first method is prone to displacement of the reference frame due to the traction of the quadriceps femoris muscle during knee flexion and extension. Therefore, the ideal placement method is one that neither extends nor increases the incision nor interferes with the robotic arm.

[0004] This invention addresses the aforementioned problems by providing a femoral reference frame. Utility Model Content

[0005] To overcome the problems mentioned in the background art, the present invention adopts the following technical solution: a femoral reference frame, comprising: a fixing part having a first axis in the height direction; a connecting rod having a first end and a second end, the first end being connected to the fixing part, the second end being located above the first end in the extension direction of the first axis, and the distance between the second end and the first axis being greater than the distance between the first end and the first axis; and a reference frame disposed on one side of the connecting rod, and the distance between the reference frame and the first end being greater than the distance between the reference frame and the second end.

[0006] In some embodiments of this application, the fixing part includes: a fixing member and a connecting arm, the connecting arm being connected to the outer wall of the fixing member, wherein the connecting arm has an included angle with the first axis.

[0007] Furthermore, the first end of the connecting rod is rotatably connected to the connecting arm.

[0008] Furthermore, the included angle ranges from 35° to 75°.

[0009] Furthermore, the connecting arm is parallel to the first axis.

[0010] In some embodiments of this application, the connecting rod has a first sidewall and a second sidewall opposite to each other, wherein the first sidewall is provided with a first connecting portion, the second sidewall is provided with a second connecting portion, and the reference frame is detachably connected to the first connecting portion and the second connecting portion.

[0011] Furthermore, the first connecting portion and the second connecting portion are arranged as mirror images of each other.

[0012] Furthermore, the reference frame has a bottom end face, wherein a connecting shaft is provided on the bottom end face, and the reference frame is connected to the first connecting part and the second connecting part through the connecting shaft.

[0013] Furthermore, the first connecting portion includes: a plurality of arc-shaped fixing plates, wherein the plurality of arc-shaped fixing plates are arranged in a circumferential array on the first sidewall, wherein the end of each arc-shaped fixing plate away from the first sidewall is inclined toward the opposite arc-shaped fixing plate, and the connecting shaft can be inserted between the plurality of arc-shaped fixing plates; and a constraint member connected to the plurality of arc-shaped fixing plates, wherein the constraint member can approach and move away from the first sidewall in the height direction of the arc-shaped fixing plates.

[0014] Furthermore, the constraint member is cylindrical, and its height is less than half the height of the arc-shaped fixing piece.

[0015] Furthermore, each of the arc-shaped fixing pieces has a first thread on its outer wall and a second thread on its inner side, wherein the first thread engages with the second thread.

[0016] The beneficial effects of this utility model are as follows: 1. By setting a fixing part including a fixing member and a connecting arm, after the connecting rod is connected to it, the connecting rod is biased towards the proximal end of the patient's femur, so that the reference frame is fixed away from the patient's osteotomy area, thereby avoiding the need to increase or prolong the surgical incision during the operation, as well as interfering with the robotic arm; 2. By setting two mirror-symmetrical connecting parts at the second end of the connecting rod, during use, the reference frame can be installed on the corresponding side of the corresponding connecting rod according to the patient's affected leg, so that the surgical robot can better identify and track the reference frame. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the fixing part structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the first end structure of the connecting rod of this utility model;

[0020] Figure 4 This is a schematic diagram of the second end structure of the connecting rod of this utility model;

[0021] Figure 5 This is a schematic diagram of the connecting rod after it is separated from the reference frame.

[0022] Figure 6 This is a schematic diagram showing the connection between the connecting rod and the reference frame of this utility model;

[0023] Figure 7 This is a cross-sectional view of the connecting rod and the reference frame after they are connected.

[0024] In the figure, 1 is the fixing part; 11 is the fixing component; 12 is the connecting arm; 2 is the connecting rod; 21 is the first end; 22 is the second end; 23 is the first side wall; 24 is the second side wall; 25 is the arc-shaped fixing piece; 26 is the constraint component; 3 is the reference frame; 31 is the connecting shaft; and 4 is the femur. Detailed Implementation

[0025] The technical solutions of this utility model are clearly and completely described below through specific embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] Figure 1 —4 illustrates the main technical content of this embodiment. This specific embodiment provides a femoral reference frame, which includes:

[0027] Fixing part 1, the fixing part 1 has a first axis in the height direction;

[0028] The connecting rod 2 has a first end 21 and a second end 22. The first end 21 is connected to the fixing part 1, and the second end 22 is located above the first end 21 in the extension direction of the first axis, and the distance between the second end 22 and the first axis is greater than the distance between the first end 21 and the first axis.

[0029] Reference frame 3 is disposed on one side of connecting rod 2, and the distance between reference frame 3 and first end 21 is greater than the distance between reference frame 3 and second end 22.

[0030] When in use, the fixing part 1 is fixed to the patient's femur 4 with fixing screws, and the connecting rod 2 is pointed towards the proximal end of the patient's femur 4. Under the action of the connecting rod 2, the reference frame 3 is biased towards the proximal end of the patient's femur 4 and faces one side of the patient's body; this avoids adding an extra incision to the patient's thigh during the operation and avoids the reference frame 3 affecting the osteotomy operation.

[0031] refer to Figure 1 —2. In this embodiment, the fixing part 1 includes a fixing member 11 and a connecting arm 12. The connecting arm 12 is connected to the outer wall of the fixing member 11. The connecting arm 12 has an angle with the first axis. Under this setting, the connecting arm 12 is inclined relative to the fixing member 11. After the connecting rod 2 is connected to the connecting arm 12, the connecting rod 2 is also inclined, thereby making the reference frame 3 away from the osteotomy area at the distal end of the patient's femur 4. More specifically, the angle ranges from 35° to 75°. Under this setting, the connecting arm 12 can extend out of the surgical incision to avoid irritating the tissues around the patient's incision.

[0032] Alternatively, the connecting arm 12 is parallel to the first axis.

[0033] More specifically, the first end 21 of the connecting rod 2 is rotatably connected to the connecting arm 12. With this configuration, the tilt angle of the connecting rod 2 can be changed, thereby facilitating the adjustment of the distance between the reference frame 3 and the patient's thigh surface. When applied to patients with larger leg circumferences, this can prevent the reference frame 3 from compressing the patient's body surface.

[0034] More specifically, the connecting arm 12 has a first connecting hole, and the first end 21 of the connecting rod 2 has a second connecting hole. A bolt is passed through the first connecting hole and the second connecting hole, and a nut is screwed onto the bolt, thereby forming an engagement relationship between the connecting rod 2 and the connecting arm 12. When it is necessary to adjust the tilt of the connecting rod 2, the nut can be loosened, allowing the connecting rod 2 to rotate around the bolt as the center, thereby adjusting the tilt of the connecting rod 2, and thus causing the reference frame 3 to move away from or closer to the patient's thigh in the longitudinal direction.

[0035] refer to Figure 1—4. In this embodiment, the connecting rod 2 has a first sidewall 23 and a second sidewall 24 that are opposite to each other. The first sidewall 23 is provided with a first connecting part, and the second sidewall 24 is provided with a second connecting part. The reference frame 3 is detachably connected to the first connecting part and the second connecting part. More specifically, after the fixing part 1 is fixed on the patient's femur 4, the first sidewall 23 of the connecting rod 2 faces the left side of the patient's body, and the second sidewall 24 faces the right side of the patient's body. In use, the reference frame 3 is installed on the corresponding side of the connecting rod 2 according to the patient's affected leg. For example, if the patient's left leg is the affected leg, the reference frame 3 is installed on the first sidewall 23 of the connecting rod 2, so that the reference frame 3 can be better identified by the navigation system. More specifically, the first connecting part and the second connecting part are mirror images of each other.

[0036] Specifically, the reference frame 3 has a bottom end face, wherein a connecting shaft 31 is provided on the bottom end face, and the reference frame 3 is connected to the first connecting part and the second connecting part through the connecting shaft 31.

[0037] refer to Figure 2 —7. In this embodiment, the first connecting part includes: a plurality of arc-shaped fixing pieces 25 and a constraint member 26. The plurality of arc-shaped fixing pieces 25 are arranged in a circumferential array on the first sidewall 23, wherein the end of each arc-shaped fixing piece 25 away from the first sidewall 23 is inclined toward the opposite arc-shaped fixing piece 25, and the connecting shaft 31 can be inserted between the plurality of arc-shaped fixing pieces 25; the constraint member 26 is connected to the plurality of arc-shaped fixing pieces 25, wherein the constraint member 26 can approach and move away from the first sidewall 23 in the height direction of the arc-shaped fixing pieces 25; in use, the connecting shaft 31 is inserted into each arc-shaped fixing piece. Within the space enclosed by the plates 25, at this time, the ends of each arc-shaped plate away from the first side wall 23 move away from the connecting shaft 31 under the action of the connecting shaft 31 and abut against the outer wall of the connecting shaft 31. Then, by moving the constraint member 26 away from the first side wall 23, each arc-shaped fixing plate 25 hugs the connecting shaft 31 tightly, thereby forming an engagement relationship between the reference frame 3 and the connecting rod 2. Conversely, when the reference frame 3 is removed, the constraint member 26 moves towards the first side wall 23, thereby releasing each arc-shaped fixing plate 25 from the connecting shaft 31, thereby separating the reference frame 3 from the connecting rod 2.

[0038] More specifically, the constraint member 26 is cylindrical, and the height of the constraint member 26 is less than 1 / 2 of the height of the arc-shaped fixing piece 25; under this arrangement, it is possible to prevent the arc-shaped fixing piece 25 from constraining the connecting shaft 31 of the reference frame 3 when it is inserted into the arc-shaped fixing piece 25.

[0039] In this embodiment, the outer wall of each arc-shaped fixing piece 25 is provided with a first thread, and the inner side of the constraint member 26 is provided with a second thread, wherein the first thread and the second thread are engaged; in use, by rotating the constraint member 26, under the engagement of the first thread and the second thread, the constraint member 26 can move closer to and further away from the first side wall 23 in the height direction of the arc-shaped fixing piece 25, thereby forming a tight fixation and release of the connecting shaft 31, so as to facilitate the operator to change the position of the reference frame 3 on the connecting rod 2.

[0040] Alternatively (not shown), a threaded rod is provided on the bottom end face of the reference frame 3, and a through hole is opened in the first side wall 23 of the connecting rod 2 towards the second side wall 24. In use, the threaded rod is passed through the through hole, and then a nut is screwed onto the threaded rod until it abuts against the second side wall 24, thereby fixing the reference frame 3 to the second end 22 of the connecting rod 2. When disassembling the reference frame 3 from the second end 22 of the connecting rod 2, the nut is unscrewed from the threaded rod. At this time, the threaded rod can be pulled out of the through hole, thereby disengaging the reference frame 3 from the connecting rod 2.

[0041] The method of using this utility model is as follows: 1. Install the reference frame on the second end of the connecting rod according to the patient's affected leg; 2. Fix the fixing part to the patient's femur using fixing screws; at this time, the reference frame is biased towards the proximal end of the patient's femur under the action of the connecting rod, and the reference frame faces one side of the patient's body; thus keeping it away from the osteotomy area, avoiding additional incisions in the patient's thigh during the operation, and avoiding the reference frame affecting the osteotomy operation; 3. By loosening the bolts and nuts connecting the connecting rod and the connecting arm, the connecting rod can be rotated relative to the connecting arm, thereby adjusting the distance between the reference frame and the patient's femur; adjusting the reference frame to the ideal position; 4. The surgical robot identifies the reference frame to locate the patient's femur, and then performs the surgical operation.

[0042] The above description of the embodiments is only for understanding the present invention. It should be noted that those skilled in the art can make several improvements to the present invention without departing from the principle of the present invention, and these improvements will also fall within the protection scope of the claims of the present invention.

Claims

1. A femoral reference frame, characterized in that, It includes: The fixing part has a first axis in the height direction; A connecting rod having a first end and a second end, the first end being connected to the fixing part, the second end being located above the first end in the extension direction of the first axis, and the distance between the second end and the first axis being greater than the distance between the first end and the first axis; A reference frame is disposed on one side of the connecting rod, and the distance between the reference frame and the first end is greater than the distance between the reference frame and the second end; The fixing part includes: a fixing member and a connecting arm, wherein the first end of the connecting rod is rotatably connected to the connecting arm; The connecting rod has a first sidewall and a second sidewall that are opposite to each other. The first sidewall is provided with a first connecting part, and the second sidewall is provided with a second connecting part. The reference frame is detachably connected to the first connecting part and the second connecting part. The reference frame has a bottom end face, wherein a connecting shaft is provided on the bottom end face, and the reference frame is connected to the first connecting part and the second connecting part through the connecting shaft; The first connecting part includes: A plurality of arc-shaped fixing pieces are arranged in a circumferential array on the first sidewall, wherein the end of each arc-shaped fixing piece away from the first sidewall is inclined toward the opposite arc-shaped fixing piece, and the connecting shaft can be inserted between the plurality of arc-shaped fixing pieces; A constraint member is connected to a plurality of the aforementioned arc-shaped fixing pieces, wherein the constraint member is able to approach and move away from the first sidewall in the height direction of the arc-shaped fixing pieces.

2. The femoral reference frame according to claim 1, characterized in that, The connecting arm is connected to the outer wall of the fixing member, wherein the connecting arm has an angle with the first axis.

3. The femoral reference frame according to claim 1, characterized in that, The connecting arm is parallel to the first axis.

4. The femoral reference frame according to claim 1, characterized in that, The first connecting portion and the second connecting portion are arranged in a mirror image of each other.

5. The femoral reference frame according to claim 1, characterized in that, The constraint member is cylindrical, and its height is less than 1 / 2 of the height of the arc-shaped fixing piece.

6. The femoral reference frame according to claim 5, characterized in that, Each of the arc-shaped fixing pieces has a first thread on its outer wall and a second thread on its inner side, wherein the first thread engages with the second thread.

Images