Eccentric positioning sleeve for orthopedic surgery and surgical instrument accurate positioning system

Abstract

The utility model relates to the technical field of medical instruments, in particular to an eccentric positioning sleeve for orthopedic surgery and a surgical instrument accurate positioning system, the eccentric positioning sleeve comprises an outer tube and an inner tube, the outer diameter of the inner tube is smaller than the inner diameter of the outer tube, and the inner tube is embedded in the outer tube in an incised mode. The eccentric sleeve can accurately adjust the position of the positioning needle in the orthopedic surgery, so that the positioning needle guides the fixing nail to be accurately guided in, the success rate of the surgery is improved, and the risk that the built-in object penetrates out of the bone is reduced. The positioning method is simple in process, free of experience limitation in operation, capable of saving operation time and relieving pain of patients and suitable for clinical popularization.

Description

Technical Field

[0001] The utility model relates to the field of medical devices, and more specifically, to an eccentric positioning sleeve for orthopedic surgery and a precise positioning system for surgical instruments. Background Art

[0002] The proximal femoral nail antirotation (PFNA) is a new type of proximal femoral internal fixation system, which is applicable to various types of femoral fractures, including intertrochanteric fractures of the femur, subtrochanteric fractures of the femur, basal fractures of the femoral neck, femoral neck fractures combined with femoral shaft fractures, and intertrochanteric fractures of the femur combined with femoral shaft fractures. As Figure 1 shown, the PFNA includes three fixation nails: a main nail 200 is inserted from the tip of the greater trochanter of the femur to fix the greater trochanter and the femoral shaft; a hollow spiral blade 600 is inserted along a positioning needle from a lateral incision opposite the femoral head, which is used to proximally lock the middle part of the main nail to achieve the functions of filling and compressing bone mass, anti-rotation and stable support; a distal short nail 700 is inserted on the lateral side of the distal end of the femoral shaft to distally lock the tail of the main nail. The PFNA has better fixation effect and has been widely used in the industry.

[0003] As Figure 7 a and Figure 2 shown, the components related to the proximal locking step in the existing locked intramedullary nail surgical instruments include: a spiral blade 600 with a diameter of 10.4 mm and different specifications of length. A hole for accommodating a positioning needle to pass through is provided in the axis of the spiral blade, and the hole diameter is the diameter of the positioning needle; a aiming arm 100 for fixing the main nail, which is internally provided with a nut for support and compression; a protective sleeve 300 that is threadedly connected to the aiming arm 100 and guides the positioning needle and the spiral blade 600 to pass through, with an outer diameter of 16 mm and an inner diameter of 11 mm; a single-hole sleeve 400 that passes through the protective sleeve 300 and matches in size, with an outer diameter of 11 mm and an inner diameter of 3.2 mm; a first positioning needle 540 that passes through the single-hole sleeve 400 and matches in size, with an outer diameter of 3.2 mm, which is used to drill into the femoral head to form a needle track and guide the proximal locking of the spiral blade 600 to prevent the spiral blade 600 from piercing through the femoral head or femoral neck due to improper position. The connection mode of the aiming arm to the main nail or the protective sleeve is a threaded connection.

[0004] The steps for inserting the spiral blade in the existing PFNA positioning system are as follows: as Figure 7 shown in a, one end of the single-hole sleeve 400 is aligned with the opening position on the lateral side of the femur. The first positioning needle 540 passes through the single-hole sleeve, drills into the femur, and after confirming that the position of the needle track is not deviated from the predetermined needle track position by means of imaging, the single-hole sleeve 400 is then withdrawn, a hollow drill is sleeved on the first positioning needle 540, the hollow drill is used to ream the hole, and finally the hollow drill is pulled out. The spiral blade 600 is sleeved on the first positioning needle 540 and then the spiral blade 600 is inserted.

[0005] However, in the existing PFNA positioning system, there are problems of difficult positioning and inconvenient adjustment in the step of inserting the spiral blade 600. During the above process, after the first positioning pin 540 is inserted, imaging means often find that the first positioning pin 540 deviates from the predetermined position on the femoral neck cross-section, increasing the risk of the spiral blade 600 piercing out of the femoral head or femoral neck. If the first positioning pin 540 is pulled out and the second positioning pin 550 is inserted, the new needle track is likely to cross and merge into the old needle track, resulting in the failure of adjusting the position of the positioning pin.

[0006] Therefore, there is an urgent need to provide an improved sleeve that is convenient for adjusting the needle track, so as to improve the surgical success rate, save surgical time, relieve the pain of patients, and reduce the risk of the implant piercing out of the femoral head. Summary of the Utility Model

[0007] The purpose of the present utility model is to overcome at least one of the above-mentioned deficiencies of the prior art, and provide an eccentric positioning sleeve and a surgical instrument precise positioning system for orthopedic surgery, which are used to accurately adjust the position of the positioning pin during orthopedic surgery, so as to guide the accurate insertion of the fixation nail through the positioning pin, improve the surgical success rate, and reduce the surgical risk.

[0008] The technical solution adopted by the present utility model is to provide an eccentric positioning sleeve for orthopedic surgery, which includes an outer tube and an inner tube. The outer diameter of the inner tube is smaller than the inner diameter of the outer tube, and the inner tube is nested inside the outer tube in an inscribed manner. The area surrounded by the inner side wall of the outer tube and the outer side wall of the inner tube is an adjustment space. The inner tube being nested inside the outer tube in an inscribed manner means that the inner tube is inscribed in the outer tube by welding, or a part of the wall of the inner tube is cut off and then welded inside the outer tube, or a part of the wall of the outer tube is cut off and then the inner tube is welded inside the outer tube. The above three connection methods all result in a cross-sectionally closed adjustment space and an inner tube for accommodating the positioning pin mentioned in the background art. Among them, the first positioning pin is sleeved inside the adjustment space, the second positioning pin is sleeved inside the inner tube, and the inner diameter of the inner tube matches the diameter of the positioning pin.

[0009] The above eccentric positioning sleeve can be used in the steps involving adjusting the position of the positioning needle in various orthopedic surgeries, including the proximal locking step of the PFNA surgery. Its inner and outer tube design allows the eccentric positioning sleeve to not only accommodate multiple positioning needles but also provides space for relative displacement between the positioning needles. While the position of the positioning needle in the outer tube remains unchanged, the position of the inner tube is adjusted by the axial rotation and radial displacement of the eccentric positioning sleeve. After the adjustment is completed, the eccentric positioning sleeve is kept stationary, and a new needle track is drilled in the inner tube. The inner tube provides guidance and protection to ensure that the new needle track is not affected by the old needle track of the positioning needle in the outer tube, thus simplifying the operation of adjusting the needle track of the positioning needle and improving the success rate. The first positioning needle is sleeved in the adjustment space, facilitating the observation and adjustment of the distance and angle between the first positioning needle and the inner tube. The outer diameter of the inner tube does not exceed half of the inner diameter of the outer tube, creating a gap between the positioning needle in the outer tube and the inner tube, preventing the new needle track from being too close to the old needle track and merging into the old needle track, which may lead to failure in adjusting the position of the positioning needle.

[0010] Furthermore, the outer diameter of the inner tube does not exceed half of the inner diameter of the outer tube; preferably, the inner diameter of the inner tube is 3 - 4 mm, and the inner diameter of the outer tube is 8 - 12 mm. The outer diameter of the positioning needle used in the existing proximal locking process of the PFNA surgery is 3.2 mm, and the inner and outer diameters of the single-hole sleeve for accommodating the positioning needle are 3.2 mm and 11 mm respectively. Therefore, restricting the inner diameter of the inner tube can prevent the positioning needle in the inner tube from shaking significantly when drilling the needle track; the inner diameter of the outer tube not being greater than 12 mm is beneficial for ensuring the wall strength; the inner diameter of the outer tube not being less than 8 mm provides a larger movement range for the positioning needle in the outer tube. When the position of the positioning needle in the outer tube remains unchanged, the entire eccentric positioning sleeve has a larger axial rotation range, making the adjustment operation more convenient.

[0011] Furthermore, the eccentric positioning sleeve further includes a base, which surrounds one end of the outer tube and is fixedly connected to the outer tube. The base is used to limit the position of the eccentric positioning sleeve within the protective sleeve and facilitates insertion and removal.

[0012] Furthermore, the inner tube wall of the tangent part between the inner tube and the outer tube coincides with the outer tube wall. The "coincidence" refers to the latter two of the above three connection methods between the outer tube and the inner tube. In addition to increasing the connection strength between the inner tube and the outer tube, it also expands the adjustment range of the position of the positioning needle in the outer tube, making the adjustment operation more convenient.

[0013] Furthermore, the eccentric positioning sleeve further includes 2 lumen partitions, which are located inside the outer tube and are tangent to the outer wall of the inner tube. Without the partitions, the distance and angle between the positioning needle in the outer tube and the inner tube can be adjusted simultaneously, which is suitable for experienced doctors; after adding the partitions, the distance and angle can be adjusted successively, which is suitable for doctors with slightly less experience.

[0014] Another object of the present utility model is to provide a precise positioning system for surgical instruments, comprising:

[0015] A main nail, with a through hole provided in the middle;

[0016] A protective sleeve for aligning with the through hole;

[0017] A aiming arm for connecting one end to the main nail and the other end to the protective sleeve, and adjusting the position of the protective sleeve;

[0018] A first positioning needle for passing through the through hole and assisting in positioning;

[0019] A single-hole sleeve for sleeving inside the protective sleeve and guiding the introduction of the first positioning needle;

[0020] It further includes a second positioning needle for passing through the through hole parallel to the first positioning needle and assisting in positioning; and the above-mentioned eccentric positioning sleeve for orthopedic surgery, which is sleeved inside the protective sleeve and guides the introduction of the second positioning needle through an inner tube.

[0021] There is a degree of freedom for distance adjustment and a degree of freedom for angle adjustment between the inner tube and the first positioning needle. The degree of freedom for distance adjustment is the distance L between the outer side of the first positioning needle and the outer wall of the inner tube, and the degree of freedom for angle adjustment is the rotation angle α of the inner tube relative to the first positioning needle. The range of the distance L is 0.01 - 6 mm, and the range of the rotation angle α is 0 - 360°.

[0022] The core of using the precise positioning system for surgical instruments lies in adjusting the position of the eccentric positioning sleeve. The method is to adjust the depth of the main nail, and while the position of the first positioning needle remains unchanged, axially rotate and radially move the eccentric positioning sleeve. A circular opening for accommodating the oblique passing of a spiral blade is provided in the middle of the main nail, for accommodating the spiral blade or the positioning needle to pass through. Therefore, by adjusting the depth of the main nail in the medullary cavity, the height position of the eccentric positioning sleeve can be adjusted. After the position of the inner tube coincides with the position of the predetermined needle track, during the process of driving in the second positioning needle, since the first positioning needle occupies the position in the old needle track, and there can be a gap between the first positioning needle and the second positioning needle, the new needle track will not be forced to deviate and merge into the old needle track, thus ensuring the successful adjustment of the positioning needle position.

[0023] Compared with the prior art, the beneficial effects of the present utility model are:

[0024] The utility model provides an eccentric positioning sleeve and a precise positioning system for surgical instruments. In orthopedic surgeries, the eccentric sleeve enables the second positioning pin to be parallel to the first positioning pin through the inner tube limit, avoiding intersection. By adjusting the relative position of the inner tube and the first positioning pin through the axial rotation and radial displacement of the outer tube, the effect of accurately adjusting the position of the positioning pin is achieved, thereby guiding the accurate insertion of the fixing nail through the positioning pin. The utility model is beneficial to improving the success rate of surgeries, reducing the risk of implants piercing through the bone; the positioning method has a simple process, the operation is not limited by experience, saves surgical time, reduces the pain of patients, and is suitable for clinical promotion and popularization. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the positions of three fixing nails and the femur in the PFNA surgery.

[0026] Figure 2 It is a schematic structural diagram of the precise positioning system for surgical instruments provided in Embodiment 1.

[0027] Figure 3 It is a schematic cross-sectional view of the part of the single-hole sleeve other than the base provided in Embodiment 1.

[0028] Figure 4 It is a schematic cross-sectional view of the eccentric positioning sleeve provided in Embodiment 1, with the inner tube being inscribed in the outer tube by welding.

[0029] Figure 5 It is a schematic cross-sectional view of the eccentric positioning sleeve provided in Embodiment 1, with a part of the inner tube wall cut off and then welded inside the outer tube.

[0030] Figure 6 It is a schematic cross-sectional view of the eccentric positioning sleeve provided in Embodiment 1, with a part of the outer tube wall cut off and then the inner tube welded inside the outer tube.

[0031] Figure 7 It is a schematic diagram of the usage method of the precise positioning system for surgical instruments provided in Embodiment 1. Figure 7 a shows step S1. Figure 7 b shows steps S3 - S4. Figure 7 c shows step S5. Figure 7 d shows step S6.

[0032] Figure 8 It is a schematic cross-sectional view of the part of the eccentric positioning sleeve other than the base provided in Embodiment 2.

[0033] Figure 9 It is a schematic cross-sectional view of the part of the eccentric positioning sleeve other than the base provided in Embodiment 3.

[0034] Label description: aiming arm 100, main nail 200, protective sleeve 300, single-hole sleeve 400, eccentric positioning sleeve 500, spiral blade 600, distal short nail 700, femoral fracture 800, base 510, outer tube 520, inner tube 530, first positioning pin 540, second positioning pin 550, lumen partition 560. Detailed implementation mode

[0035] The attached drawings of the present utility model are only for exemplary illustration and should not be construed as a limitation of the present utility model. For better illustration of the following embodiments, some components in the drawings will be omitted, enlarged or reduced, which do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0036] Embodiment 1

[0037] As Figure 2 shown, this embodiment provides a precise positioning system for surgical instruments, including:

[0038] Main nail 200, with an obliquely penetrating hole in the middle for internal fixation of the long bone shaft; protective sleeve 300 for aligning with the penetrating hole; aiming arm 100 for connecting one end to the main nail 200 and the other end to the protective sleeve 300 and adjusting the position of the protective sleeve 300; first positioning pin 540 for passing through the penetrating hole and assisting in positioning; single-hole sleeve 400 for sleeving inside the protective sleeve 300 and guiding the first positioning pin 540 to be introduced; further including a second positioning pin 550 for passing through the penetrating hole parallel to the first positioning pin 540 and assisting in positioning; and an eccentric positioning sleeve 500 for sleeving inside the protective sleeve 300 and guiding the second positioning pin 550 to be introduced through the inner tube 530. The connection mode between the aiming arm 100 and the main nail 200 or the protective sleeve 300 is a threaded connection.

[0039] Among them, the single-hole sleeve 400 can only accommodate one positioning pin to pass through, and the cross-sectional schematic diagram of the part outside its base is as Figure 3 shown. The eccentric positioning sleeve 500 includes a base 510, an outer tube 520 and an inner tube 530, and its side view is as Figure 2 shown, the cross-sectional schematic diagram of the part outside the base 510 is as Figure 4 shown. The outer diameter of the inner tube 530 is smaller than the inner diameter of the outer tube 520, and the inner tube 530 is nested inside the outer tube 520 in an inscribed manner. The area between the inner side wall of the outer tube 520 and the outer side wall of the inner tube 530 is an adjustment space, and the inner diameter of the inner tube 530 matches the diameter of the second positioning pin 550; the first positioning pin 540 is sleeved in the adjustment space, and the second positioning pin 550 is sleeved inside the inner tube.

[0040] The inner tube 530 is internally nested within the outer tube 520 in an inscribed manner, which means: The inner tube 530 is inscribed within the outer tube 520 by welding, as shown in Figure 4 ; or a part of the tube wall of the inner tube 530 is cut off and then welded within the outer tube 520, as shown in Figure 5 ; or a part of the tube wall of the outer tube 520 is cut off and then the inner tube 530 is welded within the outer tube 520, as shown in Figure 6 . All of the above three methods result in an adjustment space and an inner tube with a closed cross-section.

[0041] The above eccentric positioning sleeve 500 is used for the proximal locking step of the PFNA surgery. The design of its inner and outer tubes 520 enables the eccentric positioning sleeve 500 to accommodate multiple positioning needles; while the positions of the positioning needles in the outer tube 520 remain unchanged, the position of the inner tube 530 is adjusted by the axial rotation of the eccentric positioning sleeve 500. After the adjustment is completed, the eccentric positioning sleeve 500 is held stationary, and a new needle track is drilled in the inner tube 530. The inner tube 530 provides guidance and protection to ensure that the new needle track is not affected by the old needle track of the positioning needles in the outer tube 520, thereby simplifying the operation of adjusting the needle track of the positioning needle and improving the success rate. The outer diameter of the inner tube 530 does not exceed half of the inner diameter of the outer tube 520, so that there is a gap between the positioning needles in the outer tube 520 and the inner tube 530, avoiding the cross-merging caused by the new needle track being too close to the old needle track.

[0042] The outer diameter of the inner tube 530 is 3.8 mm and the inner diameter is 3.4 mm. The outer diameter of the outer tube 520 is 11 mm and the inner diameter is 9 mm. The outer diameter of the positioning needle used in the existing proximal locking process of the PFNA surgery is 3.2 mm, and the inner and outer diameters of the single-hole sleeve 400 for accommodating the positioning needle are 3.2 mm and 11 mm respectively. Therefore, restricting the inner diameter of the inner tube 530 can prevent the positioning needle in the inner tube 530 from shaking significantly when drilling the needle track; the inner diameter of the outer tube 520 is not greater than 10 mm, which is beneficial to ensuring the wall strength; the inner diameter of the outer tube 520 is not less than 8 mm, providing a larger movement range for the positioning needles in the outer tube 520. It is equivalent to having a larger axial rotation range for the entire eccentric positioning sleeve 500 when the positions of the positioning needles in the outer tube 520 remain unchanged, making the adjustment operation more convenient.

[0043] The usage method of the surgical instrument precise positioning system is as follows:

[0044] S1: As shown in Figure 7 a, the main nail 200 is inserted into the medullary cavity from the tip of the greater trochanter of the femur through one end of the aiming arm 100. A protective sleeve 300 is connected to the other end of the aiming arm 100. The single-hole sleeve 400 is inserted through the protective sleeve 300 and aligned with the punching position on the outer side of the femur. The first positioning needle 540 passes through the single-hole sleeve 400 and punches through the femur to form the first needle track;

[0045] S2: Determine whether there is a deviation between the position of the first positioning pin 540 and the predetermined position of the positioning pin by means of imaging. If there is no deviation, pull out the single-hole sleeve 400 from the protective sleeve 300, sleeved the spiral blade 600 outside the first positioning pin 540, and guide the spiral blade 600 to be inserted through the first positioning pin 540. If there is a deviation, perform the subsequent steps;

[0046] S3: Keep the first positioning pin 540 stationary, pull out the single-hole sleeve 400 and replace it with the eccentric positioning sleeve 500, so that the first positioning pin 540 penetrates through the cavity of the outer tube 520 of the eccentric positioning sleeve 500, as Figure 7 shown in Fig. b;

[0047] S4: Adjust the depth of the main nail 200, and while keeping the position of the first positioning pin 540 unchanged, axially rotate the eccentric positioning sleeve 500 so that the position of the inner tube 530 cavity coincides with the predetermined needle track position, as Figure 7 shown in Fig. b;

[0048] S5: As Figure 7 shown in Fig. c, sleeve the second positioning pin 550 into the inner tube 530 and insert it. Keep the second positioning pin 550 stationary, pull out the inner tube 530, the outer tube 520 and the first positioning pin 540 from the protective sleeve 300, sleeve the spiral blade 600 outside the second positioning pin 550, and guide the spiral blade 600 to be inserted through the second positioning pin 550, as Figure 7 shown in Fig. d.

[0049] In step S4, the position of the eccentric positioning sleeve 500 can be adjusted because after the first positioning pin 540 is inserted into the femur, the needle tip is anchored in the bone and it is difficult to move radially or rotate axially. However, the front end of the eccentric positioning sleeve 500 sleeved around the first positioning pin 540 does not enter the femur, so the position of the eccentric positioning sleeve 500 can be adjusted.

[0050] The method of adjusting the position of the eccentric positioning sleeve 500 is to adjust the depth of the main nail 200, and while keeping the position of the first positioning pin 540 unchanged, axially rotate the eccentric positioning sleeve 500, as Figure 7 shown in Fig. b. A circular opening for the oblique passage of the spiral blade 600 is provided in the middle of the main nail 200 to accommodate the spiral blade 600 or the positioning pin to pass through. Therefore, by adjusting the depth of the main nail 200 in the medullary cavity, the height position of the eccentric positioning sleeve 500 can be adjusted. After the position of the inner tube 530 cavity coincides with the predetermined needle track position, during the insertion of the second positioning pin 550, since the first positioning pin 540 occupies the position in the old needle track and there can be a gap between the first positioning pin 540 and the second positioning pin 550, the new needle track will not be deflected by force and merge into the old needle track, thus ensuring the success of the positioning pin position adjustment.

[0051] The parameters for adjusting the position of the eccentric positioning sleeve 500 are to adjust the distance L between the outside of the first positioning pin 540 and the outside wall of the inner tube 530, as Figure 4 shown, and to adjust the rotation angle α of the inner tube 530 relative to the first positioning pin 540; the distance L and the rotatable angle α are adjusted sequentially or simultaneously, facilitating the operation of doctors with different levels of proficiency. The range of the distance L is 0 to 4.4 mm, and the range of the rotation angle α is 0 to 360°.

[0052] The eccentric positioning sleeve and the surgical instrument precise positioning system provided in this embodiment can accurately adjust the needle track of the positioning pin during the proximal locking step of orthopedic surgery, and guide the positioning pin without misalignment, which is beneficial to improving the success rate of the surgery, reducing the risk of the implant piercing through the bone, saving surgical time, reducing the pain of the patient, and is suitable for popularization.

[0053] Embodiment 2

[0054] As Figure 8 shown, the difference between this embodiment and Embodiment 1 is only that the eccentric positioning sleeve 500 further includes a lumen partition 560, and the lumen partition 560 is located inside the outer tube 520 and is tangent to the outer wall of the inner tube 530. When no partition is added, the distance and angle between the first positioning pin 540 and the inner tube 530 can be adjusted simultaneously, which is suitable for experienced doctors; after adding the partition, the distance and angle can be adjusted successively, which is suitable for doctors with slightly less experience.

[0055] Embodiment 3

[0056] As Figure 9 shown, the difference between this embodiment and Embodiment 1 is only that the eccentric positioning sleeve 500 includes two inner tubes 530, and the two inner tubes 530 are both nested inside the outer tube 520 in an inscribed manner and the two inner tubes 530 are kept parallel. Although the above design makes the distance between the first positioning pin 540 and the second positioning pin 550 unable to be adjusted, the degree of freedom of angle adjustment still exists, and makes the first positioning pin 540 and the second positioning pin 550 parallel, ensuring the success of the adjustment and positioning process.

[0057] Obviously, the above embodiments of the present invention are only examples for clearly explaining the technical solutions of the present invention, and are not limitations on the specific implementation manners of the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the claims of the present invention shall be included within the protection scope of the claims of the present invention.

Claims

1. An eccentric positioning sleeve for orthopedic surgery, characterized in that: It comprises an outer tube and an inner tube, the outer diameter of the inner tube is smaller than the inner diameter of the outer tube, and the inner tube is inscribed and nested in the outer tube.

2. An eccentric positioning sleeve for orthopedic surgery according to claim 1, characterized in that: The outer diameter of the inner tube does not exceed half the inner diameter of the outer tube; the inner diameter of the inner tube is 3 to 4 mm, and the inner diameter of the outer tube is 8 to 12 mm.

3. The eccentric positioning sleeve for orthopedic surgery according to claim 1, characterized in that: It also includes a base, which surrounds one end of the outer tube and is fixedly connected to the outer tube.

4. The eccentric positioning sleeve for orthopedic surgery according to claim 1, characterized in that: The inner tube wall and the outer tube wall of the tangent portion of the inner tube and the outer tube overlap.

5. The eccentric positioning sleeve for orthopedic surgery according to claim 1, characterized in that: It also includes two tubular cavity partitions, which are located in the outer tube and tangent to the outer wall of the inner tube.

6. A surgical instrument precision positioning system, comprising: A main nail, with a through hole in the middle; A protective sleeve, used for aligning the through hole; An aiming arm, used to connect the main nail at one end and the protective sleeve at the other end, and to adjust the position of the protective sleeve; A first positioning needle, used to pass through the through hole and assist in positioning; A single-hole sleeve, used for being sleeved in the protective sleeve and guiding the first positioning needle to be introduced; It is characterized in that it also includes a second positioning needle, which is used to pass through the through hole parallel to the first positioning needle and assist in positioning; and an eccentric positioning sleeve for orthopedic surgery as described in any one of claims 1 to 5, which is used to be sleeved in the protective sleeve and guide the second positioning needle through the inner tube.

7. A surgical instrument precise positioning system according to claim 6, characterized in that: There are distance adjustment freedom and angle adjustment freedom between the inner tube and the first positioning needle. The distance adjustment freedom is the distance L between the outer side of the first positioning needle and the outer side of the inner tube wall, and the angle adjustment freedom is the rotation angle α of the inner tube relative to the first positioning needle.

8. A surgical instrument precise positioning system according to claim 7, characterized in that: The distance L ranges from 0.01 to 6 mm, and the rotation angle α ranges from 0 to 360°.

Images