CN114916988A

CN114916988A - Bone cutting mechanism

Info

Publication number: CN114916988A
Application number: CN202210663536.6A
Authority: CN
Inventors: 江东; 程相允
Original assignee: Peking University Third Hospital Peking University Third Clinical Medical College
Current assignee: Peking University Third Hospital Peking University Third Clinical Medical College
Priority date: 2022-06-13
Filing date: 2022-06-13
Publication date: 2022-08-19

Abstract

The invention provides a bone cutting mechanism, comprising: the bone cutting device comprises a hand piece, a bone cutting piece and a rotary fixing piece, wherein the hand piece is connected with the rotary fixing piece, and the bone cutting piece is connected with the rotary fixing piece in a sliding manner through a connecting rod; the rotary fixing part is movably connected with the scale guide pin, so that the rotary fixing part 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 that: the defect that a traditional bone drill cannot perform targeted fresh treatment on the subchondral bone cyst and can only perform horizontal shape contact with a bone contact surface is overcome, so that compared with the prior art, the targeted fresh treatment on the subchondral bone cyst can be performed, and due to the structural characteristics of the invention, the targeted cutting of the bone surface can be performed according to the condition of the osteochondral defect and the customized surface part prosthesis shape.

Description

Bone cutting mechanism

Technical Field

The invention relates to the technical field of medical instruments, in particular to a bone cutting mechanism.

Background

The focal osteochondral injury of the knee joint is a common disease, can cause pain and limited movement of the knee joint of a patient, and seriously influences the life quality of the patient. If the injury is in an early stage and the area is small, conservative treatments such as oral non-steroidal anti-inflammatory drugs, rehabilitation exercise and the like can be adopted; if conservative treatment fails, surgical approaches such as microfracture, drilling, or osteochondral transplantation are generally considered. However, the treatment is limited for the middle-aged and elderly patients who have failed the above conservative or non-conservative treatment and have large lesions. Partial resurfacing prosthesis replacements that have emerged in recent years may be used in the treatment of severe focal osteochondral injuries to such joints.

For partial surface prosthesis replacement surgery, bone drills are mostly used for treating bone tracts before the prosthesis implantation process at present. However, the bone drill cannot perform targeted fresh treatment on the subchondral bone cyst, is not beneficial to the fusion of the implanted prosthesis and the surrounding bone, and is easy to cause focus residue and cyst recurrence in the later period. In addition, the prosthesis drilled by the bone drill is mostly in a horizontal shape, and if a customized prosthesis with an irregular shape is implanted, the bone drill cannot perform targeted cutting of the bone surface according to the defect condition and the shape of the customized prosthesis.

Disclosure of Invention

The invention provides a bone cutting mechanism which can eliminate bone cysts in a targeted manner and cut bone surfaces in a targeted manner according to defect conditions and customized prosthesis shapes.

In order to achieve the above purpose, the invention provides the following technical scheme:

a bone cutting mechanism comprising: the bone cutting device comprises a hand piece, a bone cutting piece and a rotary fixing piece, wherein the hand piece is connected with the rotary fixing piece, and the bone cutting piece is connected with the rotary fixing piece in a sliding manner through a connecting rod;

the rotary fixing part is movably connected with the scale guide pin, so that the rotary fixing part moves up and down along the length direction of the scale guide pin and rotates along the circumferential direction of the scale guide pin.

Preferably, the rotating fixing member comprises a fixing ring and a supporting rod, and one end of the hand piece is connected with the fixing ring, so that the hand piece moves along with the movement of the rotating fixing member; one end of the supporting rod is connected to the inner wall of the fixing ring, the other end of the supporting rod is directed to the circle center direction of the fixing ring, and the scale guide pins are clamped and connected to the supporting rod, so that the supporting rod moves along the length direction of the scale guide pins and rotates along the circumferential direction of the scale guide pins.

Preferably, be equipped with the shrinkage pool that is used for the card to establish the scale guide pin on the bracing piece, make solid fixed ring is in drive under the effect of handheld piece the bracing piece moves up and down along the length direction of scale guide pin to the circumferencial direction of following the scale guide pin is rotatory.

Preferably, the bone cutting member comprises a connecting pipe, a bone cutting knife and a connecting rod, one end of the connecting pipe is connected with the power source, the other end of the connecting pipe is connected with the bone cutting knife, and two ends of the connecting rod are respectively fixedly connected with the bone cutting knife, the other end of the connecting rod is connected with the fixing ring in a sliding manner, so that the bone cutting knife is connected with the fixing ring in a sliding manner in the circumferential direction through the connecting rod.

Preferably, the bone cutting member further comprises a moving ring sleeved on the fixing ring, so that after the connecting rod is connected with the moving ring, the moving ring slides along the circumferential direction of the fixing ring to drive the bone cutting knife to move along the circumferential direction of the fixing ring.

Preferably, the moving ring is provided with a screw hole for a screw to pass through, and the screw is inserted and then abuts against the fixing ring so as to fix the fixing ring and the moving ring.

Preferably, the hand piece is provided with a storage for storing the connecting pipe, so that the insertion end of the connecting pipe is stored in the storage.

Preferably, the rotary fixing part further comprises a support rib, two ends of the support rib are respectively connected with the support rod and the inner wall of the fixing ring, and the scale guide pin is located in a space enclosed by the support rod, the support rib and the fixing ring.

Preferably, the hand-held piece is used for being held by an operator and providing mechanical power for the operator so as to adjust the height and the direction of the guide pin relative to the scale.

The invention relates to a bone cutting mechanism, which has the advantages that: the defect that a traditional bone drill cannot perform targeted fresh treatment on the subchondral bone cyst and can only perform horizontal shape contact with a bone contact surface is overcome, so that compared with the prior art, the targeted fresh treatment on the subchondral bone cyst can be performed, and due to the structural characteristics of the invention, the targeted cutting of the bone surface can be performed according to the bone cartilage defect condition and the customized prosthesis shape.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. In the drawings:

FIG. 1 is a schematic structural view of a bone cutting mechanism according to the present invention;

FIG. 2 is an enlarged view of part A of FIG. 1;

FIG. 3 is a schematic view of a portion of the structure of the connection between the support rod and the scale guide pin;

FIG. 4 is a schematic view of a superficial osteochondral defect;

handpiece 1, memory 11;

the bone cutting part 2, the connecting pipe 21, the bone cutting knife 22, the connecting rod 23, the moving ring 24 and the screw 25;

the rotary fixing piece 3, the fixing ring 31, the support rod 32, the inserting part 33, the concave hole 34 and the support rib 35;

a scale guide needle 4 and a osteochondral defect part 5.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it should be understood that they are presented herein only to illustrate and explain the present invention and not to limit the present invention.

According to the drawings of fig. 1-3, the invention provides a bone cutting mechanism which is convenient, fast and effective to operate, comprising a hand piece 1, a bone cutting piece 2 and a rotary fixing piece 3, wherein the hand piece 1 is connected with the rotary fixing piece 3, and the bone cutting piece 2 is connected with the rotary fixing piece 3 in a sliding manner through a connecting rod 23;

the rotary fixing part 3 is movably connected with the scale guide pin 4, so that the rotary fixing part 3 moves up and down along the length direction of the scale guide pin 4 and rotates along the circumferential direction of the scale guide pin 4.

In this embodiment, the hand piece 1 is configured to be held by an operator without affecting the operation, for example, the cross-sectional configuration may be trapezoidal, and the moving direction of the whole apparatus of the present invention can be controlled by holding the hand piece 1. Further, the hand piece 1 is used for an operator to hold and provide mechanical power for the operator to adjust the height and direction of the relative scale guide pin 4.

More specifically, the bone cutting member 2 has a working principle similar to that of an ultrasonic osteotome, has no effect on soft tissues in the working process, can perform ultrasonic cutting when meeting bones, and due to the characteristics of the bone cutting member, water flow or fine mist can be sprayed out in the cutting process, so that the cutting part can be washed while cooling a cut wound.

In a specific embodiment, in order to keep the structure of the present invention at the center of the osteochondral defect 5 (because the graduated guide pin 4 is vertically implanted into the osteochondral defect 5) during the operation process, and facilitate the operation, the rotational fixing member 3 includes 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 rotational fixing member 3; the one end of bracing piece 32 connect in gu fixed ring 31's inner wall, the other end is directional gu fixed ring 31's centre of a circle direction is through bracing piece 32 joint scale guide pin 4, makes bracing piece 32 removes along 4 length direction of scale guide pin to rotatory along the circumferencial direction of scale guide pin 4, at this in-process, because scale guide pin 4 is located 5 central authorities of the defective department of cartilage perpendicularly throughout, improve the cutting accuracy.

In order to improve the cutting degree, the scale guide pin 4 is always positioned on the longitudinal central line of the fixed ring 31. Further, the supporting rod 32 is inserted into the inner wall of the fixing ring 31, for example, as shown in the drawings of the present invention, two opposite insertion portions 33 are disposed at one end of the supporting rod 32 connected to the fixing ring 31 for being inserted into two corresponding insertion holes (not shown) in the fixing ring 31. It should be noted that the supporting rod 32 and the fixing ring 31 may be fixedly connected or inserted, and are specifically arranged according to actual requirements.

In a specific embodiment, the supporting rod 32 is provided with a concave hole 34 for being engaged with the calibration guide pin 4, so that the fixing ring 31 drives the supporting rod 32 to move up and down along the length direction of the calibration guide pin 4 and rotate along the circumferential direction of the calibration guide pin 4 under the action of the hand piece 1. In this embodiment, the scale guide pin 4 is adapted to be clamped in the concave hole 34, so as to prevent the scale guide pin 4 from shaking in the concave hole 34 to affect the operation precision.

In a specific embodiment, in order to facilitate the targeted freshening treatment of the subchondral bone cyst, and at the same time, the targeted cutting of the bone surface can be performed according to the condition of the osteochondral defect 5 and the customized prosthesis shape, the bone cutting element 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 with a power source, the other end is connected with the bone cutting knife 22, and both ends of the connecting rod 23 are respectively fixedly connected with the bone cutting knife 22, and the other end is slidably connected with the fixing ring 31, so that the bone cutting knife 22 is slidably connected around the circumference direction of the fixing ring 31 through the connecting rod 23. In this embodiment, after the connection tube 21 is inserted into an instrument (which may be one of a osteotome power system and an osteotome main machine, and the structure is commercially available and therefore not described in detail), the bone cutting knife 22 may be operated to perform ultrasonic cutting, the bone cutting knife 22 in this embodiment is an ultrasonic cutting knife, and at least one power line is provided in the connection tube 21 for providing power to the at least one mist outlet tube for spraying during the bone cutting process to clean the cutting site.

Further, for the convenience of operation, to better perform the cutting operation on the osteochondral defect 5, the bone cutting element 2 further includes a moving ring 24 sleeved on the fixing ring 31, so that after the connecting rod 23 is connected to the moving ring 24, the moving ring 24 slides along the circumferential direction of the fixing ring 31 to drive the bone cutting knife 22 to move along the circumferential direction of the fixing ring 31. Namely, the bone cutting blade 22 can move around the circumference of the fixing ring 31, and then the cutting operation of the osteochondral defect 5 in the circumferential direction is completed.

In order to fix the bone cutting knife 22, the moving ring 24 is provided with a screw hole for passing the screw 25, and the screw 25 is inserted and then abuts against the fixing ring 31, so that the fixing ring 31 and the moving ring 24 are fixed.

For carrying and transportation, the hand piece 1 is provided with a storage 11 for storing the connecting tube 21, so that the insertion end of the connecting tube 21 is stored therein.

In a specific embodiment, in order to improve the accuracy, ensure the normal movement of the rotating fixing member 3 on the scale guide pin 4, and reduce the pressure of the structure of the present invention on the scale guide pin 4, the rotating fixing member 3 further includes a support rib 35 having two ends respectively connected to the support rod 32 and the inner wall of the fixing ring 31, and the scale guide pin 4 is located in the space enclosed by the support rod 32, the support rib 35, and the fixing ring 31.

The invention is realized by the following steps:

the scale guide pin 4 is clamped into the concave hole 34, then the insertion end of the connecting pipe 21 is inserted into a corresponding instrument to open the bone cutting knife 22, and meanwhile, the hand-held piece 1 can be held to move the hand-held piece 1 along the length direction and the circumferential direction of the scale guide pin 4 as required so as to adjust the cutting position of the bone cutting knife 22 at the osteochondral defect 5;

the position and motion relation among the connecting rod 23, the moving ring 24 and the fixing ring 31 can realize that the bone cutting knife 22 moves along the circumferential direction of the fixing ring 31, and compared with the horizontal shape cutting when the bone drill is used for cutting in the prior art, the bone cutting knife can cut the bone surface in a targeted way according to the defect condition and the customized prosthesis shape.

Principles, structures, processes, etc., not specifically described in the present disclosure are available to those of ordinary skill in the art through routine skill.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such 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 such modifications and variations.

Claims

1. A bone cutting mechanism, characterized in that: the bone cutting device comprises a hand-held piece (1), a bone cutting piece (2) and a rotary fixing piece (3), wherein the hand-held piece (1) is connected with the rotary fixing piece (3), and the bone cutting piece (2) is connected with the rotary fixing piece (3) in a sliding manner through a connecting rod (23);

the rotary fixing part (3) is movably connected with the scale guide pin (4), so that the rotary fixing part (3) moves up and down along the length direction of the scale guide pin (4) and rotates along the circumferential direction of the scale guide pin (4).

2. The bone cutting mechanism of claim 1, wherein: the rotary fixing piece (3) comprises a fixing ring (31) and a supporting rod (32), one end of the handheld piece (1) is connected with the fixing ring (31), and the handheld piece (1) moves along with the movement of the rotary fixing piece (3); the one end of bracing piece (32) connect in the inner wall of solid fixed ring (31), the other end is directional gu the centre of a circle direction of fixed ring (31) is through bracing piece (32) joint scale guide pin (4), makes bracing piece (32) remove along scale guide pin (4) length direction to it is rotatory along the circumferencial direction of scale guide pin (4).

3. The bone cutting mechanism of claim 2, wherein: be equipped with shrinkage pool (34) that are used for the card to establish scale guide pin (4) on bracing piece (32), make solid fixed ring (31) are in drive under the effect of handheld piece (1) bracing piece (32) move up and down along the length direction of scale guide pin (4) to it is rotatory along the circumferencial direction of scale guide pin (4).

4. A bone cutting mechanism as claimed in claim 3, wherein: the bone cutting piece (2) comprises a connecting pipe (21), a bone cutting knife (22) and a connecting rod (23), one end of the connecting pipe (21) is connected with a power source, the other end of the connecting pipe is connected with the bone cutting knife (22), and the two ends of the connecting rod (23) are respectively fixedly connected with the bone cutting knife (22), the other end of the connecting rod is connected with the fixing ring (31) in a sliding mode, so that the bone cutting knife (22) can wind around the fixing ring (31) in a sliding mode in the circumferential direction through the connecting rod (23).

5. The bone cutting mechanism of claim 4, wherein: the bone cutting piece (2) further comprises a moving ring (24) sleeved on the fixing ring (31), so that after the connecting rod (23) is connected with the moving ring (24), the moving ring (24) slides along the circumferential direction of the fixing ring (31) to drive the bone cutting knife (22) to move along the circumferential direction of the fixing ring (31).

6. The bone cutting mechanism of claim 5, wherein: the moving ring (24) is provided with a screw hole for a screw (25) to pass through, and the screw (25) is inserted and then abuts against the fixing ring (31) so as to fix the fixing ring (31) and the moving ring (24).

7. The bone cutting mechanism of claim 4, wherein: the hand piece (1) is provided with a memory (11) for storing the connecting pipe (21), so that the inserting end of the connecting pipe (21) is stored in the memory.

8. The bone cutting mechanism according to claim 2, wherein: the rotary fixing piece (3) further comprises a support rib (35) with two ends respectively connected with the support rod (32) and the inner wall of the fixing ring (31), and the scale guide pin (4) is located in a space enclosed by the support rod (32), the support rib (35) and the fixing ring (31).

9. The bone cutting mechanism of claim 7, wherein: the hand-held piece (1) is used for an operator to hold and provide mechanical power for the operator to adjust the height and direction of the relative scale guide pin (4).