Bone cutting mechanism

Abstract

The present invention provides a bone cutting mechanism, comprising: a handpiece, a bone cutting piece, and a rotating fixing piece, wherein the handpiece is connected to the rotating fixing piece, and the bone cutting piece is slidably connected to the rotating fixing piece through a connecting rod; wherein the rotating fixing piece is movably connected to the scale guide pin, so that the rotating fixing piece moves up and down along the length direction of the scale guide pin, and rotates along the circumferential direction of the scale guide pin. The advantages are: avoiding the defects of the traditional use of bone drills that cannot perform targeted freshening treatment on subchondral bone cysts and can only perform horizontal contact with the bone contact surface, so that compared with the prior art, the present application can perform targeted freshening treatment on subchondral bone cysts, and due to the structural characteristics of the present invention, targeted cutting of the bone surface can be performed according to the situation of the osteochondral defect and the shape of the customized surface part prosthesis.

Description

Technical Field

[0001] The invention relates to the technical field of medical instruments, in particular to a bone cutting mechanism. Background Art

[0002] Focal osteochondral injury of the knee joint is a common disease that can cause knee pain and limited mobility, seriously affecting the patient's quality of life. If the injury is in the early stage and the area is small, conservative treatments such as oral nonsteroidal anti-inflammatory drugs and rehabilitation exercises can be adopted; if conservative treatment fails, surgical methods such as microfracture, drilling or osteochondral transplantation can generally be considered. However, for middle-aged and elderly patients who have failed the above conservative or non-conservative treatments and have large lesions, treatment options are limited. Partial surface prosthesis replacement that has emerged in recent years can be used to treat severe focal osteochondral injuries in such joints.

[0003] For partial surface prosthesis replacement surgeries, bone drills are currently used for bone channel processing before the prosthesis implantation process. However, bone drills cannot perform targeted freshening treatment on subchondral bone cysts, which is not conducive to the fusion of implanted prostheses with surrounding bones, and is also prone to residual lesions and later cyst recurrence. In addition, the contact surface between the prosthesis and the bone drilled by the bone drill is mostly horizontal. If an irregularly shaped customized prosthesis is implanted, this type of bone drill cannot perform targeted cutting of the bone surface according to the defect and the shape of the customized prosthesis. Summary of the invention

[0004] The present invention provides a bone cutting mechanism, which can eliminate bone cysts in a targeted manner and perform targeted cutting of the bone surface according to the defect situation and the customized prosthesis shape.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0006] The bone cutting mechanism comprises: a hand piece, a bone cutting piece, and a rotating fixing piece, wherein the hand piece is connected to the rotating fixing piece, and the bone cutting piece is slidably connected to the rotating fixing piece through a connecting rod;

[0007] The rotating fixing part is movably connected to the scale guide needle, so that the rotating fixing part moves up and down along the length direction of the scale guide needle and rotates along the circumferential direction of the scale guide needle.

[0008] Preferably, the rotating fixing member includes a fixing ring and a support rod, and one end of the handpiece is connected to the fixing ring so that the handpiece moves with the movement of the rotating fixing member; one end of the support rod is connected to the inner wall of the fixing ring, and the other end points to the center direction of the fixing ring. The support rod is clamped with the scale guide needle, so that the support rod moves along the length direction of the scale guide needle and rotates along the circumferential direction of the scale guide needle.

[0009] Preferably, the support rod is provided with a recessed hole for clamping the scale guide needle, so that the fixing ring drives the support rod to move up and down along the length direction of the scale guide needle and rotate along the circumferential direction of the scale guide needle under the action of the handpiece.

[0010] Preferably, the bone cutting part includes a connecting tube, a bone cutting knife, and a connecting rod. One end of the connecting tube is connected to a power source, and the other end is connected to the bone cutting knife. Both ends of the connecting rod are respectively fixedly connected to the bone cutting knife, and the other end is slidably connected to the fixing ring, so that the bone cutting knife is slidably connected around the circumferential direction of the fixing ring through the connecting rod.

[0011] Preferably, the bone cutting member further comprises a movable ring sleeved on the fixed ring, so that after the connecting rod is connected to the movable ring, the movable ring slides along the circumferential direction of the fixed ring to drive the bone cutting knife to move along the circumferential direction of the fixed ring.

[0012] Preferably, the movable ring is provided with screw holes for screws to pass through, and the screws are inserted and abut against the fixed ring to fix the fixed ring to the movable ring.

[0013] Preferably, a storage device for storing the connecting tube is provided on the handpiece, so that the plug-in end of the connecting tube is stored therein.

[0014] Preferably, the rotating fixing member also includes support ribs whose two ends are respectively connected to the support rod and the inner wall of the fixing ring, so that the scale guide needle is located in the space enclosed by the support rod, the support ribs and the fixing ring.

[0015] Preferably, the handpiece is used to be held by an operator and provide mechanical power thereto so as to adjust the height and direction of the relative scale guide needle.

[0016] The bone cutting mechanism of the present invention has the advantages of avoiding the defects of the traditional bone drill that cannot perform targeted freshening treatment on subchondral bone cysts and can only make horizontal contact with the bone contact surface. Compared with the prior art, the present application can perform targeted freshening treatment on subchondral bone cysts, and due to the structural characteristics of the present invention, targeted cutting of the bone surface can be performed according to the osteochondral defect situation and the customized prosthesis shape. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification for explaining the present invention, but do not constitute a limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 It is a structural schematic diagram of the bone cutting mechanism of the present invention;

[0019] Figure 2 for Figure 1 A schematic diagram of the enlarged structure of the middle part A;

[0020] Figure 3 It is a schematic diagram of the partial structure of the connection between the support rod and the scale guide needle;

[0021] Figure 4 is a schematic diagram of a surface osteochondral defect;

[0022] Handheld device 1, memory 11;

[0023] Bone cutting member 2, connecting tube 21, bone cutting knife 22, connecting rod 23, moving ring 24, screw 25;

[0024] Rotating fixing member 3, fixing ring 31, supporting rod 32, plug-in portion 33, recessed hole 34, supporting rib 35;

[0025] Scale guide needle 4, osteochondral defect 5. DETAILED DESCRIPTION

[0026] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0027] according to Figure 1-3 As shown, the present invention provides a bone cutting mechanism that is easy to operate, fast and effective, comprising a handpiece 1, a bone cutting piece 2, and a rotating fixing piece 3. The handpiece 1 is connected to the rotating fixing piece 3, and the bone cutting piece 2 is slidably connected to the rotating fixing piece 3 via a connecting rod 23;

[0028] The rotating fixing member 3 is movably connected to the scale guide needle 4 , so that the rotating fixing member 3 moves up and down along the length direction of the scale guide needle 4 and rotates along the circumferential direction of the scale guide needle 4 .

[0029] In this embodiment, the structure of the handpiece 1 is convenient for the operator to hold and does not affect the operation. For example, its cross-section structure can be trapezoidal, and the movement direction of the entire device of the present invention can be controlled by holding the handpiece 1. Furthermore, the handpiece 1 is used for the operator to hold and provide mechanical power to adjust the height and direction of the relative scale guide needle 4.

[0030] More specifically, the working principle of the bone cutting piece 2 is the same as that of an ultrasonic bone knife. During operation, it has no effect on soft tissues. When encountering bones, ultrasonic cutting can be performed. Due to its characteristics, water flow or fine mist will be sprayed out during the cutting process, which can cool the cut wound and rinse the cut area at the same time.

[0031] In a specific embodiment, in order to facilitate operation while keeping the structure of the present invention at the center of the osteochondral defect 5 at all times during operation (since the scale guide needle 4 is vertically implanted at the osteochondral defect 5), the rotating fixture 3 includes a fixing ring 31 and a support rod 32. One end of the handpiece 1 is connected to the fixing ring 31, so that the handpiece 1 moves with the movement of the rotating fixture 3; one end of the support rod 32 is connected to the inner wall of the fixing ring 31, and the other end points to the center direction of the fixing ring 31. The scale guide needle 4 is clamped by the support rod 32, so that the support rod 32 moves along the length direction of the scale guide needle 4 and rotates along the circumferential direction of the scale guide needle 4. In this process, since the scale guide needle 4 is always vertically located at the center of the osteochondral defect 5, the cutting accuracy is improved.

[0032] In order to improve the cutting degree, the scale guide pin 4 is always located on the longitudinal center line of the fixing ring 31. Further, the support rod 32 is plugged into the inner wall of the fixing ring 31. For example, as shown in the drawings of the present invention, two oppositely arranged plug-in parts 33 are provided on one end of the support rod 32 connected to the fixing ring 31 to be plugged into two corresponding plug holes in the fixing ring 31 (not shown in the drawings). It should be noted that the support rod 32 and the fixing ring 31 can be fixedly connected or plugged, which is specifically set according to actual needs.

[0033] In a specific embodiment, the support rod 32 is provided with a concave hole 34 for clamping the scale guide pin 4, so that the fixing ring 31 drives the support rod 32 to move up and down along the length direction of the scale guide pin 4 and rotate along the circumferential direction of the scale guide pin 4 under the action of the handpiece 1. In this embodiment, the scale guide pin 4 is adapted to be clamped in the concave hole 34 to prevent the scale guide pin 4 from shaking in the concave hole 34 and affecting the surgical accuracy.

[0034] In a specific embodiment, in order to facilitate targeted freshening of subchondral bone cysts, and to perform targeted cutting of the bone surface according to the condition of the osteochondral defect 5 and the shape of the customized prosthesis, the bone cutting member 2 includes a connecting tube 21, a bone cutting knife 22, and a connecting rod 23. One end of the connecting tube 21 is connected to the power source, and the other end is connected to the bone cutting knife 22. The two ends of the connecting rod 23 are respectively fixedly connected to the bone cutting knife 22, and the other end is slidably connected to the fixing ring 31, so that the bone cutting knife 22 is slidably connected around the circumferential direction of the fixing ring 31 through the connecting rod 23. In this embodiment, when the connecting tube 21 is inserted into the instrument (which can be one of the bone cutting knife power system and the bone cutting host, and the structure can be obtained commercially, so it is not described in detail), the bone cutting knife 22 can be operated to perform ultrasonic cutting. The bone cutting knife 22 in this embodiment is an ultrasonic cutting knife, and there is at least one power cord in the connecting tube 21 for providing power, and at least one mist outlet pipe is used for spraying and cleaning the cutting area during the bone cutting process.

[0035] Furthermore, in order to facilitate the operation and better perform the cutting operation on the osteochondral defect 5, the bone cutting member 2 further includes a movable ring 24 sleeved on the fixed ring 31, so that after the connecting rod 23 is connected to the movable ring 24, the movable ring 24 slides along the circumferential direction of the fixed ring 31 to drive the bone cutting knife 22 to move along the circumferential direction of the fixed ring 31. That is, the bone cutting knife 22 can move around the circumferential direction of the fixed ring 31, and then complete the cutting operation on the osteochondral defect 5 in the circumferential direction.

[0036] In order to fix the bone cutting knife 22 , the movable ring 24 is provided with a screw hole for the screw 25 to pass through. The screw 25 is inserted and abuts against the fixing ring 31 to fix the fixing ring 31 to the movable ring 24 .

[0037] In order to facilitate carrying and transportation, the handpiece 1 is provided with a storage 11 for storing the connecting tube 21, so that the plug end of the connecting tube 21 is stored therein.

[0038] In a specific embodiment, in order to improve the accuracy, ensure the normal movement of the rotating fixing member 3 on the scale guide needle 4, and reduce the pressure of the structure of the present invention on the scale guide needle 4, the rotating fixing member 3 also includes support ribs 35 respectively connected to the support rod 32 and the inner wall of the fixing ring 31 at both ends, and the scale guide needle 4 is located in the space enclosed by the support rod 32, the support ribs 35, and the fixing ring 31.

[0039] The present invention is achieved in that:

[0040] Insert the graduated guide pin 4 into the concave hole 34, and then insert the insertion end of the connecting tube 21 into the corresponding instrument to open the bone cutter 22. At the same time, the handpiece 1 can be held and moved along the length direction and circumferential direction of the graduated guide pin 4 as needed to adjust the cutting position of the bone cutter 22 at the osteochondral defect 5;

[0041] The position and movement relationship between the connecting rod 23 and the movable ring 24 and the fixed ring 31 can realize the movement of the bone cutting knife 22 along the circumferential direction of the fixed ring 31. Compared with the horizontal shape cutting when using a bone drill in traditional cutting, the present invention can perform targeted cutting on the bone surface according to the defect situation and the customized prosthesis shape.

[0042] The principles, structures, processes, etc. not explicitly described in the present invention can be obtained by those skilled in the art through conventional technical means.

[0043] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A bone cutting mechanism, characterized in that: It comprises a hand piece (1), a bone cutting piece (2), and a rotating fixing piece (3), wherein the hand piece (1) is connected to the rotating fixing piece (3), and the bone cutting piece (2) is slidably connected to the rotating fixing piece (3) via a connecting rod (23); The rotating fixing member (3) is movably connected to the scale guide needle (4), so that the rotating fixing member (3) moves up and down along the length direction of the scale guide needle (4) and rotates along the circumferential direction of the scale guide needle (4); The rotating fixing member (3) comprises a fixing ring (31) and a support rod (32); one end of the hand piece (1) is connected to the fixing ring (31), so that the hand piece (1) moves along with the movement of the rotating fixing member (3); one end of the support rod (32) is connected to the inner wall of the fixing ring (31), and the other end points to the center direction of the fixing ring (31); the support rod (32) is clamped with the scale guide needle (4), so that the support rod (32) moves along the length direction of the scale guide needle (4) and rotates along the circumferential direction of the scale guide needle (4); The support rod (32) is provided with a recessed hole (34) for clamping the scale guide needle (4), so that the fixing ring (31) drives the support rod (32) to move up and down along the length direction of the scale guide needle (4) and rotate along the circumferential direction of the scale guide needle (4) under the action of the handpiece (1); The bone cutting member (2) comprises a connecting tube (21), a bone cutting knife (22), and a connecting rod (23); one end of the connecting tube (21) is connected to a power source, and the other end is connected to the bone cutting knife (22); both ends of the connecting rod (23) are respectively fixedly connected to the bone cutting knife (22), and the other end is slidably connected to the fixing ring (31), so that the bone cutting knife (22) is slidably connected around the circumferential direction of the fixing ring (31) through the connecting rod (23); The bone cutting member (2) further comprises a movable ring (24) sleeved on the fixed ring (31), so that after the connecting rod (23) is connected to the movable ring (24), the movable ring (24) slides along the circumferential direction of the fixed ring (31) to drive the bone cutting knife (22) to move along the circumferential direction of the fixed ring (31); The hand piece (1) is provided with a storage (11) for storing the connecting tube (21), so that the plug-in end of the connecting tube (21) is stored therein.

2. A bone cutting mechanism according to claim 1, characterized in that: The movable ring (24) is provided with a screw hole for the screw (25) to pass through, and the screw (25) is inserted and abuts against the fixed ring (31) to fix the fixed ring (31) and the movable ring (24).

3. A bone cutting mechanism according to claim 1, characterized in that: The rotating fixing member (3) further comprises a supporting rib (35) with two ends respectively connected to the supporting rod (32) and the inner wall of the fixing ring (31), so that the scale guide needle (4) is located in a space enclosed by the supporting rod (32), the supporting rib (35) and the fixing ring (31).

4. A bone cutting mechanism according to claim 1, characterized in that: The handpiece (1) is used to be held by an operator and to provide mechanical power thereto so as to adjust the height and direction of the relative scale guide needle (4).

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