Tibia sagittal osteotomy guider

Abstract

The utility model relates to the technical field of medical instruments, in particular to a tibia sagittal osteotomy guider, in particular to a tibia sagittal osteotomy guider used for an oxford inner side movable platform unicompartmental knee arthroplasty, which comprises a sleeve, a guide frame and a locking piece. A guide part is formed at the first end of the guide frame, a plurality of clamping teeth are formed on the guide part, a connecting part is formed at the second end of the guide frame, and a strip-shaped guide hole is formed in the connecting part; a mounting hole is formed in the sleeve, the sleeve comprises a fixing seat, fixing teeth are formed at the first end of the fixing seat, a sleeve is fixed to the second end of the fixing seat, and the sleeve penetrates through the guide hole and then is locked with the locking piece in a matched mode. By means of the slidable design of the guiding frame, guiding and positioning on the tibia platforms of different anatomical forms are achieved, an operator can conveniently use a reciprocating saw to conduct tibia sagittal osteotomy according to the edge of the guiding frame, and accurate tibia platform sagittal osteotomy can be achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical instrument technical field, especially tibial sagittal osteotomy guider for oxford medial mobile platform unicompartmental arthroplasty. BACKGROUND

[0002] The knee joint medial unicompartmental arthroplasty represented by the oxford mobile platform design concept is a kind of surgery for treating knee joint medial single compartment lesion, it has the advantages such as small trauma, less bleeding, quick recovery compared with total knee arthroplasty.In unicompartmental arthroplasty, tibial plateau sagittal osteotomy is a key step, it involves the rotation alignment of prosthesis implant position in sagittal plane and the recovery of postoperative knee function.A large number of literatures have reported that if the sagittal osteotomy line presents as internal / external rotation of inner or beyond limit, then it is easy to appear prosthesis overhanging and cause medial soft tissue repeated friction, movable washer impact and accelerated wear, eventually lead to postoperative persistent pain, washer dislocation and joint function limitation and other complications.Therefore, how to accurately perform tibial sagittal osteotomy in unicompartmental arthroplasty to ensure good alignment position of tibial prosthesis is the hot issue of current joint surgery.

[0003] In the operation guide suggestion provided by oxford unicompartmental prosthesis manufacturer, the operator can position the direction of osteotomy by touching ipsilateral anterior superior iliac spine of patient during operation, then accurately place reciprocating saw on the inner slope of intercondylar ridge of tibia, and the saw blade points to the touched anterior superior iliac spine, to perform sagittal plane osteotomy.For those patients who are obviously obese and pelvic tilt, it is especially difficult to touch the anterior superior iliac spine covered by sterile surgical drape by hand, so that the accuracy of sagittal osteotomy positioning is highly dependent on subjective experience and hand feeling of operator, and the final osteotomy effect has high uncertainty, it is difficult to ensure the correct alignment of tibial prosthesis.

[0004] Therefore, it is necessary to design a guider for assisting tibial sagittal osteotomy in operation to improve the accuracy of osteotomy. UTILITY MODEL CONTENT

[0005] In order to solve the problem that in oxford knee joint medial unicompartmental arthroplasty, tibial sagittal osteotomy is usually positioned by finding and touching anterior superior iliac spine of patient according to experience of operator, this method has obvious subjectivity, it is difficult to accurately perform osteotomy operation, and problems such as too much or too little osteotomy and poor rotation alignment of osteotomy are prone to occur, the utility model provides a kind of tibial sagittal osteotomy guider for oxford medial mobile platform unicompartmental arthroplasty.

[0006] In order to realize the above-mentioned purpose, the technical scheme applied by the utility model is as follows:

[0007] A tibial sagittal osteotomy guide for Oxford medial mobile platform unicompartmental replacement surgery, comprising a sleeve, a guide frame and a locking piece; the first end of the guide frame is formed with a guide portion, a plurality of clamping teeth are formed on the guide portion, the second end of the guide frame is formed with a connecting portion, and a strip-shaped guide hole is formed in the connecting portion; the sleeve is formed with a mounting hole, the sleeve comprises a fixing seat, the first end of the fixing seat is formed with a fixing tooth, and the second end of the fixing seat is fixed with a sleeve pipe which is locked with the locking piece after penetrating through the guide hole.

[0008] According to the above scheme, the sleeve is a circular tube structure, and the outer diameter of the sleeve is equal to the short diameter of the guide hole.

[0009] According to the above scheme, the locking piece is a cylindrical structure, and an inner hole is formed in the locking piece, and the hole diameter of the inner hole is equal to the outer diameter of the sleeve.

[0010] According to the above scheme, an external thread is formed on the outer wall of the end of the sleeve close to the locking piece, and an internal thread matched with the external thread is formed on the inner wall of the inner hole.

[0011] According to the above scheme, the fixing seat is a cylindrical structure, and the fixing tooth is annularly arranged on the surface of the first end of the fixing seat.

[0012] According to the above scheme, the surfaces on both sides of the connecting portion where the guide hole is opened are flat, the surface of the end of the fixing seat close to the guide hole is flat, and the surface of the end of the locking piece close to the guide hole is flat, and the diameters of the fixing seat and the locking piece are greater than the short diameter of the guide hole.

[0013] According to the above scheme, a plurality of clamping teeth are arranged side by side at the outer edge position of the end of the guide portion, and the spacing between the plurality of clamping teeth is equal.

[0014] The utility model has the advantages of simple structure, convenient use and operation, and the like.

[0015] The guide frame is slidably designed to realize guiding and positioning on tibial platforms with various different anatomical shapes, the surgeon can use a reciprocating saw to perform tibial sagittal osteotomy by referring to the edge of the guide frame, accurate tibial platform sagittal osteotomy can be realized, the risk of spacer impact dislocation and tibial prosthesis placement alignment caused by spacer sagittal plane wear can be effectively avoided, and therefore the clinical effect of the surgery is improved and the risk of postoperative complications is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the overall structure perspective view of the utility model;

[0017] Figure 2 is the exploded view of the whole machine structure of the utility model;

[0018] Figure 3 is the working schematic view of the utility model in unicompartmental arthroplasty surgery;

[0019] Figure 4 is Figure 3 the enlarged view of position A in the middle.

[0020] in the figure:

[0021] 1, sleeve; 11, fixed seat; 12, sleeve pipe; 13, mounting hole; 14, fixed tooth; 2, guide frame; 20, connecting part; 21, guide hole; 22, guide part; 23, clamping tooth; 3, locking piece; 31, inner hole; 4, femur; 41, femoral head center; 5, intramedullary rod; 6, tibial plateau; 7, reciprocating saw; 8, tuning fork-like connector; 81, fixed fork arm; 82, movable fork arm. DETAILED DESCRIPTION

[0022] The technical scheme of the utility model will be described below in combination with the drawings and embodiments.

[0023] As Figures 1 to 4 indicated, the utility model discloses a tibial sagittal osteotomy guide for oxford medial mobile platform unicompartmental arthroplasty surgery, including sleeve 1, guide frame 2 and locking piece 3, the first end of guide frame 2 is shaped with guide part 22, a plurality of clamping teeth 23 are shaped on guide part 22, the second end of guide frame 2 is shaped with connecting part 20, and strip-shaped guide hole 21 is shaped in connecting part 20, sleeve 1 is shaped with mounting hole 13 in, sleeve 1 includes fixed seat 11, the first end of fixed seat 11 is shaped with fixed tooth 14, the second end of fixed seat 11 is fixed with sleeve pipe 12, and sleeve pipe 12 is locked after passing through guide hole 21 and cooperating with locking piece 3.The above constitutes the basic structure of the utility model.

[0024] The working principle of the utility model is:

[0025] As Figure 3 and Figure 4As shown, in the knee joint flexion 90° position, firstly, the conventional insertion of the intramedullary rod 5 is completed, at this time, the direction of the intramedullary rod 5 represents the anatomical axis of the femur 4, then the sleeve 1 of the device is placed on the distal articular surface of the femur 4, the fixed seat 11 is tightly attached to the distal surface of the femur 4, the guide hole 21 of the connecting part 20 of the guide frame 2 is sleeved into the sleeve 12, then the locking piece 3 is screwed into the end of the sleeve 12, at the beginning, it is not tightened to keep the activity of the guide frame 2; the fixed prong arm 81 of the 7° tuning fork connector 8 is inserted into the intramedullary rod 5 to assemble, the movable prong arm 82 at the other end is inserted into the mounting hole 13 of the sleeve 1 to complete the connection operation, at this time, the direction of the sleeve 1 is coaxial with the movable prong arm 82 of the tuning fork connector 8, that is, the anatomical axis of the femur 4 is fixedly angled at 7° in the transverse plane; then the direction of the guide part 22 of the guide frame 2 is adjusted by rotating and sliding, so that the plurality of clamping teeth 23 accurately fall on the inner slope of the intercondylar ridge of the tibial platform 6, attention should be paid to avoiding the stop point of the anterior cruciate ligament to avoid iatrogenic injury, after the positioning of the plurality of clamping teeth 23 of the guide part 22 is completed, the locking piece 3 is tightened to complete the fixation of the guide frame 2; then, the reciprocating saw 7 is used to tightly attach the clamping teeth 23 and take them as a reference to perform sagittal plane osteotomy, at this time, the sagittal plane osteotomy line accurately pointing to the femoral head center 41 is obtained; finally, according to the standard operation process of the Oxford unicompartmental knee arthroplasty, the subsequent surgical steps are continued to be completed.

[0026] The device has a relatively simple structure, is convenient to use and operate, and provides an accurate and stable guiding auxiliary device for tibial sagittal osteotomy by perfectly matching the tuning fork connector 8 and the intramedullary rod 5 in the Oxford unicompartmental tool set, so that the positioning deviation and operation difficulty problems of tibial sagittal osteotomy under the traditional technology in the clinic are effectively solved; the slidable design of the guide frame 2 can realize guiding and positioning on tibial platforms 6 with various different anatomical shapes, the surgeon can use the reciprocating saw 7 to refer to the edge of the guide frame 2 to perform tibial sagittal osteotomy, accurate tibial platform 6 sagittal osteotomy can be realized, the spacer impact dislocation caused by poor alignment of the tibial prosthesis placement and the reduction of the spacer sagittal wear can be effectively avoided, so that the clinical effect of the operation is improved and the risk of postoperative complications is reduced.

[0027] The inner diameter of the mounting hole 13 is equal to the outer diameter of the movable prong arm 82 of the tuning fork connector 8, after the movable prong arm 82 of the tuning fork connector 8 is inserted, the direction of the sleeve 1 is consistent with the direction of the inserted movable prong arm 82, so that the sagittal osteotomy direction is consistent with the movable prong arm 82 of the tuning fork connector 8 (the movable prong arm 82 of the tuning fork connector 8 of the Oxford unicompartmental knee is fixedly pointed to the anterior superior iliac spine, and is consistent with the sagittal osteotomy direction).

[0028] Further, the sleeve 12 is a circular tube structure, and the outer diameter of the sleeve 12 is equal to the short diameter of the guide hole 21. In this way, when the sleeve 12 is arranged in the guide hole 21, the outer wall of the sleeve 12 is attached to the inner wall on both sides of the guide hole 21, and the assembly effect is better, and the sleeve 12 is prevented from being too small relative to the guide hole 21 to cause assembly looseness; when the position of the guide frame 2 is adjusted, the inner wall on both sides of the guide hole 21 of the guide frame 2 is attached to the outer wall of the sleeve 12 to slide, and the sliding position and fixed landing point of the guide frame 2 are adjusted by the operator to adapt to the anatomical morphology of the tibial plateau of different patients, so that the guide frame 2 can slide and rotate adjustably close to the sleeve 1, and the guide has universality for left and right limbs.

[0029] Further, the locking member 3 is a cylindrical structure, and an inner hole 31 is formed in the locking member 3, and the hole diameter of the inner hole 31 is equal to the outer diameter of the sleeve 12. In this way, when the locking member 3 is arranged on the sleeve 12, the inner hole 31 of the locking member 3 is attached to the outer wall of the sleeve 12, and the assembly effect is better.

[0030] Further, the outer wall of the end of the sleeve 12 close to the locking member 3 is formed with external threads, and the inner wall of the inner hole 31 is formed with internal threads matched with the external threads for threaded connection. In this way, the assembly is convenient, the locking member 3 is screwed into the sleeve 12 and tightened to complete the clamping and limiting of the sliding of the guide frame 2, and the influence of the guide frame 2 caused by the violent vibration during the osteotomy process of the reciprocating saw 7 is reduced.

[0031] Further, the fixing seat 11 is a cylindrical structure, and the fixing teeth 14 are annularly arranged on the surface of the first end of the fixing seat 11. In this way, the fixing stability of the fixing seat 11 can be effectively improved to realize the anti-sliding effect between the fixing seat 11 and the distal articular surface of the femur 4.

[0032] Further, the surfaces of the two sides of the connecting part 20 where the guide holes 21 are arranged are flat, the surface of the end of the fixing seat 11 close to the guide hole 21 is flat, the surface of the end of the locking member 3 close to the guide hole 21 is flat, and the diameters of the fixing seat 11 and the locking member 3 are greater than the short diameter of the guide hole 21. In this way, after assembly, the fixing seat 11 and the locking member 3 are respectively attached to the two flat surfaces of the connecting part 20 where the guide holes 21 are arranged, and the assembly effect is more stable.

[0033] The width of the connecting part 20 is determined according to the anatomical parameters of the tibial plateau of the average Chinese and the length of the movable fork arm 82 of the tuning fork connector 8, and is most preferably 10 mm; the length of the connecting part 20 is also determined according to the anatomical parameters of the distal femur of the Chinese, and is most preferably 20 mm.

[0034] Further, the plurality of the teeth 23 are arranged side by side at the outer edge of the end of the guide part 22, and the spacing between the plurality of the teeth 23 is equal. In this way, the stability of the fixation of the guide frame 2 on the articular surface of the tibial plateau 6 is enhanced.

[0035] The cross section of the guide part 22 is in the shape of a sharp cone, or the outer edge of the end of the guide part 22 is arranged in the shape of an inclined plane relative to the connecting part 20.

[0036] The embodiments of the present application are described above with reference to the drawings; however, the present application is not limited to the specific embodiments described above, and the specific embodiments described above are merely illustrative, rather than limiting. Those skilled in the art can make many forms under the inspiration of the present application without departing from the purpose of the present application and the scope protected by the claims, and these all belong to the protection scope of the present application.

Claims

1. A tibial sagittal osteotomy guide for use in Oxford medial mobile bearing unicompartmental replacement surgery, characterized in that: The sleeve (1), the guide frame (2) and the locking piece (3) are included. The first end of the guide frame (2) is formed with a guide part (22), and a plurality of clamping teeth (23) are formed on the guide part (22). The second end of the guide frame (2) is formed with a connecting part (20), and a strip-shaped guide hole (21) is formed in the connecting part (20). The sleeve (1) is formed with a mounting hole (13) therein. The sleeve (1) includes a fixed seat (11). The first end of the fixed seat (11) is formed with a fixed tooth (14). The second end of the fixed seat (11) is fixed with a sleeve pipe (12). The sleeve pipe (12) is locked with the locking piece (3) after passing through the guide hole (21).

2. The tibial sagittal bone cut guide of claim 1, wherein: The sleeve pipe (12) is a circular tube structure. The outer diameter of the sleeve pipe (12) is equal to the short diameter of the guide hole (21).

3. The tibial sagittal bone cut guide of claim 2, wherein: The locking piece (3) is a cylindrical structure. An inner hole (31) is formed in the locking piece (3). The hole diameter of the inner hole (31) is equal to the outer diameter of the sleeve pipe (12).

4. The tibial sagittal bone cut guide of claim 3, wherein: An external thread is formed on the outer wall of one end of the sleeve pipe (12) close to the locking piece (3). An internal thread is formed on the inner wall of the inner hole (31) for thread connection with the external thread.

5. The tibial sagittal bone cut guide of claim 1, wherein: The fixed seat (11) is a cylindrical structure. The fixed tooth (14) is annular and located on the first end surface of the fixed seat (11).

6. The tibial sagittal bone cut guide of claim 1, wherein: The surfaces of the connecting part (20) on both sides of the guide hole (21) opening are flat. The surface of one end of the fixed seat (11) close to the guide hole (21) is flat. The surface of one end of the locking piece (3) close to the guide hole (21) is flat. The diameters of the fixed seat (11) and the locking piece (3) are greater than the short diameter of the guide hole (21).

7. The tibial sagittal bone cut guide of claim 1, wherein: A plurality of clamping teeth (23) are arranged side by side at the outer edge position of the end of the guide part (22). The spacing between the plurality of clamping teeth (23) is equal.

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