CN107411800B - A surgical instrument for trimming the curved surface of bones - Google Patents

Abstract

The invention provides a surgical instrument for trimming the curved surface of a bone, comprising a knife head and a knife handle; the knife head comprises: an arc-shaped knife edge (1), a serrated structure (2), a plurality of springs (3), and the tail of the knife head is embedded in The upper part (4) is connected with a T-shaped T-shaped connection, and the lower part (5) is embedded in the T-shaped connection at the end of the cutter head; Refers to the grasping part (9); wherein, the T-shaped structure at the tail of the cutter head is connected to the upper part (4) and the embedded T-shaped connection lower part (5) of the tail of the cutter head is used to be embedded in the T-shaped slot hole of the front end of the cutter handle (6), In order to achieve convenient and quick installation and/or disassembly, the thumb grip portion (7) and the four-finger grip portion (9) are designed according to the ergonomic principle of the operator's hand holding the tool, preventing the handle of the tool from being removed from the operator during surgery. Hands fall off and/or avoid operator hand discomfort during long-term use.

Description

A surgical instrument for trimming the curved surface of bones

technical field

The present invention relates to a surgical instrument suitable for repairing the bone surface into an arc-shaped structure during surgery.

Background technique

At present, domestic and foreign orthopedics, orthopedic trauma departments, etc. all need to carry out detailed trimming of the surface of the skeletal structure to adapt to the attachment of tendons, muscles and soft tissues. Especially in orthopedics, the curved bone surface needs to be trimmed, and the implant and the bone surface need to be well matched when the 3D printed personalized bone plate is implanted, so the bone structure needs to be trimmed accordingly. In medical equipment, most knives have flat blades, such as J12090 10#, J12100 11# and other surgical knives are flat, even like J12110 12# scalpel, although the shape of the blade is L-shaped, the blade Still flat. For the skeletal structure that needs to be trimmed into curved surfaces, the precision of the flat blade in excising the compact bone and cancellous bone is poor, resulting in excessive resection of the bone body, which will prolong the recovery time of postoperative patients.

SUMMARY OF THE INVENTION

3D printing technology is more and more widely used in medical orthopedic implants. Bone plate reconstruction after tumor resection, bone plate design during foot joint fusion, and curved surface modeling of prosthesis surface, etc., need to match personalized bone plate and prosthesis. Body surface modeling design. In the process of medical imaging, structural design, and prosthesis design, there is an error between the actual implant shape and the actual contour of the bone surface, so the irregular contour of the bone surface needs to be trimmed. It is difficult to maintain the irregular contour of the bone surface by trimming the bone surface with the flat blade of the scalpel.

The purpose of the patent of the present invention is to provide a medical device with a simple structure, convenient and suitable structure for the irregular contour of the bone surface in orthopaedic surgery and the bone surface trimming when the curvature of the 3D printed bone plate is inconsistent with the bone surface. Bone surface outline.

According to one aspect of the present invention, there is provided a surgical instrument for trimming the curved surface of a bone, which is characterized by comprising:

cutter head, including:

curved blade,

sawtooth structure,

multiple springs,

The tail of the cutter head is embedded with a T-shaped connection to the upper part,

The bottom part of the cutter head is embedded with a T-shaped connection,

Knife handle, including:

handle body,

front end of handle,

thumb grip,

Four-finger gripping part,

in,

The T-shaped structure at the tail of the cutter head connects the upper part and the embedded T-shaped connection at the tail of the cutter head. The lower part is used to be embedded in the T-slot hole at the front end of the tool holder, so as to realize convenient and quick installation and/or disassembly,

The thumb grip portion and the four-finger grip portion are designed according to the ergonomic principle of the operator's hand holding the knife, to prevent the knife handle from falling off the operator's hand during surgery and/or to avoid the operator's hand discomfort during long-term use.

Description of drawings

FIG. 1 is a structural diagram of a cutter head according to an embodiment of the present invention.

Figure 2 is a cross-sectional view of a cutter head according to one embodiment of the present invention.

FIG. 3 is a view along the direction A of FIG. 1 .

FIG. 4 is a plan view of the handle of the embodiment shown in FIG. 1 .

FIG. 5 is a bottom view of the handle of FIG. 4 .

FIG. 6 is a view along the B direction of FIG. 4 .

FIG. 7 is a top view of the cutter head of FIG. 1 and the handle of FIG. 4 after assembly.

FIG. 8 is a bottom view of the cutter head and handle of FIG. 7 after assembly.

FIG. 9 is a cross-sectional view along the C direction of the connecting portion of the cutter head and the cutter handle in FIG. 8 after assembly.

Reference number:

1-Arc-shaped blade; 2-Sawtooth structure; 3-Spring; 4-The upper part of the embedded T-shaped connection at the tail of the cutter head; 5-The lower part of the embedded T-shaped connection at the tail of the cutter head; 6-The front end of the handle connected with the cutter head; 7-thumb gripping part; 8-knife handle body; 9-four-finger gripping part.

Detailed ways

The purpose of the present invention is to provide a surgical instrument for trimming the curved surface of the bone, that is, to provide a medical instrument for trimming the bone surface that can be easily disassembled by an orthopedist or a surgeon, has excellent ergonomic coordination and is multipurpose. The medical device can be used to trim the bone surface into an arc-shaped structure.

As shown in Figures 1-9, the medical device includes a knife head and a knife handle. The cutter head includes an arc-shaped blade 1, a serrated structure 2, a spring 3, an upper part 4 of a T-shaped connection embedded in the tail of the cutter head, and a lower part 5 of an embedded T-shaped connection at the tail of the cutter head. Among them, the radian of the arc-shaped blade 1 can be designed into various types of arc structures according to the curvature of the bone surface, which is convenient to fit the bone surface well when trimming the bone surface; The sawtooth structure 2 can be used for sawing trimming when the surface is facing; the spring 3 is easy to disassemble and clamp; the T-shaped structure at the end of the cutter head connects the upper part 4 and the connection lower part 5 and can be accurately embedded in the handle, which is convenient and quick to install and disassemble. On the handle of the knife, according to the ergonomics of the plastic surgeon or surgeon holding the knife, the grasping direction of the thumb and other four fingers of the hand is designed to prevent the knife handle from falling off during surgery and to prevent hand discomfort during long-term use; secondly , the handle can also match the percussion hammer in the medical device to increase the propulsive force for trimming the bone.

The shank includes a shank body 8 and a shank front end 6 , as shown in FIGS. 4 and 5 .

The material of the knife head and the knife handle for trimming the curved surface of the bone is stainless steel, which can be repeatedly sterilized and prevented from rusting caused by repeated use. The arc size of the knife head can be designed into different sizes of curved blades according to the curvature of the bone surface. The diameter of the knife handle ranges from 3 to 3.5 cm, which is convenient for plastic surgeons or surgeons to grasp. Its structural design conforms to the posture characteristics of the hand. . The thumb grip portion 7 and the four-finger grip portion 9 can be structurally designed according to the average length and width of fingers of Chinese adults.

The overall structure of the surgical instrument for trimming the curved surface of the bone is stainless steel, and no other materials are used. According to the embodiment shown in Figures 1-9, the assembly relationship between the spring and the tail of the cutter head is as follows: four springs 3 are semi-press-fitted into the corresponding upper part 4 and the lower part 5 of the embedded T-shaped connection at the tail of the cutter head position, so that the connecting parts 4 and 5 of the tail of the cutter head are embedded in the handle, that is, under the force of the spring 3, the tail of the cutter head is embedded in the T-slot of the front end 6 of the handle (Fig. 4); when removing or replacing the cutter head , By pressing the upper part 4 of the embedded T-shaped connection at the end of the cutter head and the lower part 5 of the embedded T-shaped connection at the end of the cutter head, the spring 3 is squeezed, and the cutter head is removed from the T-shaped groove at the front end 6 of the handle; thus free Easy and fast loading and unloading.

According to an embodiment of the present invention, the surgical instrument for trimming the curved surface of a bone includes a knife head and a knife handle. Among them, the arc-shaped blade 1 of the cutter head can be processed into blade sizes of different radians according to different bone surfaces (it can be divided into various types). The entire front end 6 of the handle and the body 8 of the handle are formed by one-time processing, and the thumb grasping part 7 and the four-finger grasping part 9 conform to the anatomical characteristics of human fingers.

Specific installation, use and removal process:

The installation process includes: holding one-half of the middle area of the cutter head in one hand, so that the axis of the cutter head shown in FIG. 1 and the axis of the cutter handle shown in FIG. 4 are in a straight line. Assemble the upper part 4 of the embedded T-shaped connection at the end of the cutter head and the lower part 5 of the embedded T-shaped connection at the end of the cutter head with the T-slot hole of the front end 6 of the shank until it can no longer be inserted.

The use process includes: holding the handle of the knife, so that the thumb is in the thumb grasping part 7, and the other four fingers are in the position of the four-finger grasping part 9, and force is applied along the axial direction to trim the bone surface. If the cortical bone of the bone is too thick, it can be sawed through the sawtooth structure 2, and then trimmed with the curved blade 1; in order to increase the trimming strength, a hammer can also be used to hit the plane at the end of the handle.

Disassembly process: When it is necessary to disassemble or replace the cutter head with different radians, hold the handle body 8 with one hand, press the two springs 3 at the front end of the cutter head with the other end, and apply a pull-out force at the same time, the cutter head and the handle can be separated. , to achieve disassembly or replacement.

Claims (6)

1. A surgical instrument for trimming the curved surface of a bone is characterized in that comprising: cutter head, including: Curved blade (1), sawtooth structure (2), a plurality of springs (3), The T-shaped connection upper part (4) is embedded in the tail of the cutter head, The bottom part of the cutter head is embedded with a T-shaped connection (5), Knife handle, including: Shank body (8), The front end of the shank (6), Thumb Grip (7), The four-finger grip portion (9), in, The T-shaped structure at the end of the cutter head connects the upper part (4) and the lower part (5) of the embedded T-shaped connection at the end of the cutter head for embedding in the T-slot hole of the front end of the tool holder (6), so as to realize convenient and quick installation and/or disassembly , when the installation is completed, the axis of the cutter head and the axis of the handle are in a straight line, and the arc of the arc-shaped blade (1) protrudes to the distal end along the direction of the straight line, The thumb grip portion (7) and the four-finger grip portion (9) are designed according to the ergonomic principle of the operator's hand holding the knife, to prevent the knife handle from falling off the operator's hand during surgery and/or to avoid the operator during long-term use hand discomfort, The handle body (8) is matched with the percussion hammer to increase the propulsive force for trimming the bone, The radian of the arc-shaped blade (1) is designed to fit various types of arc-shaped structures of the curvature of the bone surface, so as to fit well with the bone surface when the bone surface is trimmed. 2. The surgical instrument according to claim 1, characterized in that: The sawtooth structure (2) is suitable for sawing trimming when trimming a bone surface with a relatively large thickness. 3. The surgical instrument according to claim 1, characterized in that: The overall structure of the surgical instrument is stainless steel. 4. The surgical instrument according to claim 1, characterized in that the assembly relationship of the spring (3) and the cutter head is: A plurality of springs (3) are semi-press-fitted into the corresponding positions between the upper part (4) of the embedded T-shaped connection at the end of the cutter head and the lower part (5) of the embedded T-shaped connection at the end of the cutter head, so that when the end of the cutter head is embedded When the upper part (4) of the T-shaped connection and the lower part (5) of the embedded T-shaped connection at the end of the cutter head are embedded in the tool shank, the upper part (4) and The bottom part (5) of the embedded T-shaped connection at the end of the cutter head is embedded in the T-shaped groove of the front end (6) of the tool holder, and when the cutter head is removed or replaced, the upper part (4) and the cutter head are connected by pressing the embedded T-shaped connection at the end of the cutter head. The embedded T-shaped connection at the tail part is connected to the lower part (5) and squeezes the spring (3), thereby removing the cutter head from the T-shaped groove at the front end (6) of the cutter handle. 5. The surgical instrument according to claim 1, characterized in that: The front end of the shank (6) and the shank body (8) are integrally formed by one-time processing. The thumb grasping part (7) and the four-finger grasping part (9) conform to the anatomical characteristics of human fingers. 6. The surgical instrument according to one of claims 1-5, characterized in that: The use process of the surgical instrument includes: The knife handle is suitable for being held by an operator during use, so that the operator's thumb is located in the thumb grasping part (7), and the other four fingers of the operator's hand are located in the four-finger grasping part (9) so that the operator can apply axial force to trim the bone surface.

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