Bone cutter

Abstract

The utility model relates to the technical field of medical instruments, and provides a bone cutter. The bone cutter comprises a cutter body and a cutter head. Wherein the cutter head comprises an extending part, the extending part is connected with the cutter body, and the end, away from the cutter body, of the extending part is bent in the direction deviating from the extending direction to form a cutting part; contracting faces are arranged on the two sides of the extending part and the two sides of the cutting part so that the width of the tool bit can be reduced. The utility model solves the problem in the prior art that the transition section of the cutter connected with the cutting part is thicker and cannot be inserted into a kerf, so that the operation space required by an operation is increased. According to the utility model, the extension part is arranged, so that the bending of the cutting part is smaller at the same kerf depth, thereby reducing the length of an incision of an operation, reducing the operation space of the operation and reducing the risk of the operation. In addition, due to the fact that the cutting part deviates from the extending direction of the extending part, the bone tissue cutting device can bypass the spinal cord to a certain degree to conduct bone tissue cutting.

Description

Technical Field

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

[0002] With the development of medical technology, orthopedic surgery has become more diversified. Accordingly, different shapes of surgical blades are used to cut and grind the affected area according to different orthopedic conditions. When the spinal cord needs to be bypassed to cut the lamina, the blade is set to a lateral bending type to facilitate bypassing the spinal cord in order to reduce the operating space.

[0003] However, the transition section connecting the knife and the cutting part in the prior art is relatively thick and cannot be inserted into the incision, thus increasing the operating space required for the operation. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the related art. To this end, the utility model provides a bone cutting tool to solve the problem that the transition section connecting the tool and the cutting part of the prior art is too thick and cannot be inserted into the cutting seam, thereby increasing the operating space required for surgery.

[0005] The utility model provides a bone cutting tool, comprising:

[0006] Blade,

[0007] The blade head comprises an extension part, the extension part is connected to the blade body, one end of the extension part away from the blade body is bent along a direction deviating from the extension direction to form a cutting part; contraction surfaces are provided on both sides of the extension part and the cutting part to reduce the width of the blade head.

[0008] According to a bone cutting tool provided by the utility model, the cutting portion includes a knife back and a blade, the cutting portion is inclined from one side of the blade to one side of the knife back, and the angle between the extension portion and the cutting portion is an obtuse angle.

[0009] According to a bone cutting tool provided by the utility model, the cutting portion comprises a contraction section and a cutting section, and the contraction section gradually contracts from one end connected to the extension section to one end connected to the cutting section.

[0010] According to the bone cutting tool provided by the utility model, the blade of the cutting section is an arc-shaped structure.

[0011] According to the bone cutting tool provided by the utility model, at least one of the blade back of the cutting section and the blade edge of the cutting section is provided with cutting teeth.

[0012] According to the bone cutting tool provided by the utility model, the knife back and the blade of the cutting section are both provided with cutting teeth.

[0013] According to a bone cutting tool provided by the utility model, an arcuate transition section is provided at one end of the cutting section away from the contraction section, and the arcuate transition section is provided with cutting teeth.

[0014] According to a bone cutting tool provided by the utility model, the blade body includes a blade rod and a connecting portion, one end of the blade rod is connected to the blade head, and the other end of the blade rod is connected to the connecting portion.

[0015] According to a bone cutting tool provided by the utility model, the knife bar comprises a first knife bar and a second knife bar connected to each other;

[0016] One end of the first knife bar away from the second knife bar is connected to the connecting portion, and one end of the second knife bar away from the first knife bar is connected to the knife head;

[0017] The diameter of the first cutter bar is different from the diameter of the second cutter bar.

[0018] According to a bone cutting tool provided by the utility model, the contraction surface of the cutting part is provided with a groove, and the groove is used for discharging bone residues.

[0019] The above one or more technical solutions in the embodiments of the utility model have at least one of the following technical effects:

[0020] The utility model can make the cutting part enter a deeper incision by setting the extension part. Due to the setting of the extension part, the bending of the cutting part is smaller when the incision depth is the same, thereby reducing the length of the surgical incision, reducing the surgical operation space, and reducing the risk of the surgery. In addition, the utility model makes the cutting part deviate from the extension direction of the extension part, so that the utility model can bypass the spinal cord to a certain extent to cut bone tissue. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 This is a front view of the bone cutting tool provided by the utility model;

[0023] Figure 2 It is a top view of the bone cutting tool provided by the utility model;

[0024] Figure 3 This is one of the structural schematic diagrams of the cutter head of the bone cutting tool provided by the utility model;

[0025] Figure 4 This is the second structural schematic diagram of the cutter head of the bone cutting tool provided by the utility model;

[0026] Figure 5 This is the third structural schematic diagram of the cutter head of the bone cutting tool provided by the utility model;

[0027] Figure 6 This is the fourth structural schematic diagram of the cutter head of the bone cutting tool provided by the utility model;

[0028] Figure 7 This is the fifth structural schematic diagram of the cutter head of the bone cutting tool provided by the utility model.

[0029] Reference numerals:

[0030] 100: blade body; 110: blade bar; 111: first blade bar; 112: second blade bar; 120: clamping part; 130: connecting part;

[0031] 200: blade head; 210: extension portion; 211: contraction portion; 220: cutting portion; 221: blade back; 222: blade edge; 223: cutting teeth; 224: arc-shaped transition section; 225: groove. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "first" and "second" are numbered for the purpose of clearly explaining the product components and do not represent any substantial difference. The directions of "upper" and "lower" shall be based on the directions shown in the accompanying drawings. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to the specific circumstances. In addition, the meaning of "multiple" is two or more. In the specification, "and / or" means at least one of the connected objects, and the character " / " generally indicates that the previously associated objects are in an "or" relationship.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Figure 1 The front view of the bone cutting tool provided by the embodiment of the utility model is illustrated; Figure 2 The top view of the bone cutting tool provided by the embodiment of the utility model is illustrated.

[0036] Reference Figure 1 or Figure 2 The bone cutting tool provided by the embodiment of the utility model comprises a blade body 100 and a blade head 200. The blade head 200 comprises an extension portion 210, which is connected to the blade body 100, and one end of the extension portion 210 away from the blade body 100 is bent along a direction deviating from the extension to form a cutting portion 220; contraction surfaces are provided on both sides of the extension portion 210 and the cutting portion 220 to reduce the width of the blade head 200.

[0037] In the above structure, the extension part 210 is provided so that the cutting part 220 can enter a deeper slit. Since the extension part 210 is provided, the bending of the cutting part 220 is smaller when the slit is penetrated to the same depth, thereby reducing the length of the surgical incision, reducing the surgical operation space, and reducing the risk of the surgery. In addition, by providing contraction surfaces on both sides of the extension part 210 and the cutting part 220, the width of the cutter head 200 can be reduced, so that the bone cutting tool can better enter the slit, reduce the friction with the slit, and further reduce the secondary damage to the incision. The utility model sets the cutting part 220 away from the extension direction of the extension part 210, so that the utility model can bypass the spinal cord to a certain extent to cut bone tissue.

[0038] Specifically, the blade 100 and the blade head 200 are integrally formed, so that the utility model has a strong connection strength, so that the utility model can be used better. The material of the blade 100 and the blade head 200 can be stainless steel, high-carbon stainless steel, tungsten steel or titanium alloy. Among them, stainless steel has good corrosion resistance and is not easy to rust. High-carbon stainless steel has excellent hardness and toughness. Of course, its material is not limited to the above-mentioned types. Some other metal materials or ceramic materials with high hardness, corrosion resistance and wear resistance can be used, as long as the quality, performance of the surgical knife and the biocompatibility and safety of the surgical instrument are ensured. Secondly, the extension part 210 and the cutting part 220 are provided with contraction surfaces on both sides. It can be understood that the extension part 210 and the cutting part 220 are flat structures. Setting the extension part 210 and the cutting part 220 as a flat structure can facilitate access to the inside of the surgical incision.

[0039] Figure 3 One of the structural schematic diagrams of the cutter head of the bone cutting tool provided by the embodiment of the utility model is illustrated; Figure 4 The second structural schematic diagram of the cutter head of the bone cutting tool provided by the embodiment of the utility model is illustrated; Figure 5 The third structural schematic diagram of the tool head of the bone cutting tool provided in the embodiment of the utility model is illustrated.

[0040] Reference Figure 3 In some embodiments of the present invention, the cutting portion 220 includes a blade back 221 and a blade 222, the cutting portion 220 is inclined from one side of the blade 222 to one side of the blade back 221, and the angle between the extension portion 210 and the cutting portion 220 is an obtuse angle. That is, Figure 3 The α in the figure is an obtuse angle.

[0041] In the above structure, since the cutting portion 220 is inclined from one side of the blade 222 to one side of the blade back 221, this design enables the blade 222 to cut into the bone more quickly, reducing the resistance during cutting. At the same time, the inclined blade 222 can move more smoothly along the bone surface, improving the cutting accuracy. The angle between the extension portion 210 and the cutting portion 220 is an obtuse angle, that is, the cutting portion 220 forms a larger angle when it deviates from the extension direction. This design enables the tool to better adapt to the irregular shape and curved structure of the bone surface, reducing the jamming and deviation that may occur during the cutting process. In addition, since the angle between the cutting portion 220 and the extension portion 210 is an obtuse angle, this structure helps to disperse the stress generated during cutting and improves the overall strength of the tool. This makes the tool less likely to break or be damaged when subjected to greater pressure. The inclined structure of the cutting portion 220 allows the operator to control the cutting depth by changing the cutting force during cutting. When shallow cutting is required, the operator can reduce the cutting force; and when deep cutting is required, the cutting force can be increased. This design provides greater operational flexibility and control.

[0042] Reference Figure 3 In some embodiments of the present invention, the cutting portion 220 includes a contraction section and a cutting section, and the contraction section gradually contracts from one end connected to the extension portion 210 to one end connected to the cutting section.

[0043] Specifically, the contraction section and the cutting section are connected to each other. The end of the contraction section away from the cutting section is connected to the extension part 210. The extension part 210, the contraction section and the cutting section are all integrally formed. The contraction section gradually contracts from the end connected to the extension part 210 to the end connected to the cutting section. It can be understood that the width of the contraction section in the vertical direction gradually decreases from the end connected to the extension part 210 to the end connected to the cutting section. That is, Figure 3 In this case, d1 is greater than d2.

[0044] It is understandable that in the direction from the blade body 100 to the blade head 200 in the contraction section, the distance between the back of the blade 221 and the blade 222 gradually decreases. Such a design, on the one hand, can make the tool fit the bone surface more closely during the cutting process, reduce the error in the cutting process, and improve the cutting accuracy. On the other hand, since the distance between the back of the blade 221 and the blade 222 gradually decreases, the tool can concentrate more power during the cutting process, thereby improving the cutting efficiency. Furthermore, the distance between the back of the blade 221 and the blade 222 gradually decreases, and the tool can also control the cutting depth and range more accurately during the cutting process, reducing the damage to the surrounding tissues.

[0045] Reference Figure 3 In some embodiments of the present invention, the blade 222 of the cutting section is an arc-shaped structure.

[0046] In the above structure, the design of the arc-shaped cutting teeth 223 makes the cutting surface smoother, reduces the possible breakage and irregularity during the cutting process, and thus improves the cutting accuracy. During the cutting process, the tool can slide across the bone surface more smoothly, reducing jamming and resistance, thereby improving the smoothness of the cutting. Secondly, the design of the arc-shaped cutting teeth 223 can also effectively reduce damage to surrounding tissues, because the arc-shaped cutting teeth 223 can better fit the curve of the bone during the cutting process, reducing unnecessary cutting and scratches.

[0047] Reference Figure 3 and Figure 5 In some embodiments of the present invention, at least one of the blade back 221 and the blade edge 222 of the cutting section is provided with cutting teeth 223 .

[0048] It is understandable that this embodiment has at least three solutions. Solution 1: The blade 222 of the cutting section is provided with cutting teeth 223 (such as Figure 3 Solution 2: The back of the cutting section 221 and the blade 222 are provided with cutting teeth 223 (as shown); Figure 5 Solution 3: The back of the cutting section 221 is provided with cutting teeth 223 (not shown). In some other possible embodiments, 222 is not provided with 223 (such as Figure 4 shown).

[0049] In the above structure, the design of the cutting teeth 223 can make the blade 222 produce more cutting points during the cutting process, thereby improving the cutting efficiency. The existence of the cutting teeth 223 allows the tool to cut into the bone more quickly; at the same time, it can also increase the contact area between the blade 222 and the bone, so that the tool can fit the bone surface more stably during the cutting process, reducing the shaking and deviation of the tool, thereby improving the cutting stability and reducing the time and force required for cutting. Secondly, the sharp edge of the cutting teeth 223 can effectively cut the bone and reduce the resistance during the cutting process. This design allows the tool to cut more smoothly.

[0050] Specifically, the shape of the cutting teeth 223 can be straight teeth, sawtooth teeth or oblique teeth. Among them, there are multiple straight teeth, and the multiple straight teeth are evenly arranged along the blade 222. Straight teeth have the advantages of being simple, strong, and easy to manufacture and maintain. It can provide uniform cutting force, making the cutting of bones more stable; there are also multiple sawtooth teeth, and multiple sawtooth teeth are arranged along the blade 222 in a sawtooth shape. Each sawtooth tooth is provided with a sharp tip, so that it can provide better self-sharpening and cutting ability during the cutting process. The design of the sawtooth teeth can also reduce friction and resistance during the cutting process and improve cutting efficiency; the tooth shape of the oblique teeth is set at a certain angle to the axis of the blade 222. This design can increase the angle change when the blade 222 cuts into the bone, making the cutting process smoother. The oblique teeth can also provide better cutting force distribution, reduce stress concentration on the blade 222, and improve the stability and efficiency of cutting.

[0051] Figure 6 The fourth structural schematic diagram of the tool head of the bone cutting tool provided in the embodiment of the utility model is illustrated.

[0052] Reference Figure 6 In some embodiments of the present invention, the back 221 and the blade 222 of the cutting section are both provided with cutting teeth 223. An arc-shaped transition section 224 is provided at one end of the cutting section away from the contraction section, and the arc-shaped transition section 224 is provided with cutting teeth 223.

[0053] In the above structure, by providing cutting teeth 223 on the back 221, the blade 222 and the arc-shaped transition section 224 of the cutting section, the tool can have efficient cutting ability throughout the entire cutting process. The cutting teeth at different positions can work together to share the cutting force, thereby quickly and effectively cutting bones. This allows the tool to better adapt to different cutting scenarios, such as cutting bones of different shapes, sizes and hardness.

[0054] Reference Figure 2 In some embodiments of the present invention, the blade body 100 includes a blade rod 110 and a connecting portion 130 , one end of the blade rod 110 is connected to the blade head 200 , and the other end is connected to the connecting portion 130 .

[0055] Specifically, the connecting portion 130 is provided with an external thread, and by providing the connecting portion 130, the tool can be better connected to the transducer. Bone cutting tools are usually used in surgical operations to cut or cut bones and hard tissues. The transducer is a device that converts one form of energy into another form. Connecting the bone cutting tool to the transducer can utilize the energy converted by the transducer to provide the bone cutting tool to increase the power of the bone cutting tool or change its working mode. For example, an ultrasonic transducer can be connected to the bone cutting tool, and then electrical energy can be converted into ultrasonic energy. These ultrasonic energies can be transmitted to the bone cutting tool, so that the bone cutting tool generates ultrasonic vibrations, making it easier to cut bones and hard tissues. Such a connection can improve the efficiency, accuracy and safety of the bone cutting tool during surgery.

[0056] Reference Figure 2 In some embodiments of the utility model, the knife rod 110 includes a first knife rod 111 and a second knife rod 112 connected to each other, an end of the first knife rod 111 away from the second knife rod 112 is connected to the connecting part 130, an end of the second knife rod 112 away from the first knife rod 111 is connected to the knife head 200, and the diameter of the first knife rod 111 is smaller than the diameter of the second knife rod 112.

[0057] It should be noted that the tool rod 110 is not limited to the above structure. It is only necessary to make the diameter of the tool rod 110 not unique, that is, the tool rod 110 is designed with a variable diameter. According to vibration theory, the resonant frequency is related to the mass and stiffness of the vibration system. By adjusting the diameter of the tool rod 110, the mass distribution and stiffness of the tool rod 110 can be changed, thereby affecting the resonant frequency of the tool rod 110. A tool rod 110 with a larger diameter usually has a lower frequency, while a tool rod 110 with a smaller diameter has a higher frequency. Therefore, by reducing the diameter of the tool rod 110, the resonant frequency of the tool rod 110 can be adjusted. By adjusting the resonant frequency of the tool, it can be better adapted to specific working conditions and improve work efficiency and precision.

[0058] Reference Figure 2 In some embodiments of the present invention, a clamping portion 120 is provided between the knife rod 110 and the connecting portion 130 .

[0059] Specifically, the clamping portion 120 may be a hexagonal prism structure. By providing the clamping portion 120 , it is convenient to clamp the cutting tool, thereby facilitating the connection of the tool to the transducer through a tool such as a wrench.

[0060] Figure 7 The fifth structural schematic diagram of the tool head of the bone cutting tool provided in the embodiment of the utility model is illustrated.

[0061] Reference Figure 7In some possible embodiments of the present invention, the contraction surface of the cutting portion 220 is provided with a groove 225, and the groove 225 is used to discharge bone residues.

[0062] The utility model provides a groove 225 on the contraction surface of the cutting portion 220, which can, on the one hand, discharge the bone residue after cutting, and on the other hand, improve the efficiency of cutting. It should be noted that the groove 225 is obliquely arranged on the surface of the contraction surface, and the groove 225 extends from one side of the blade to one side of the back of the blade, and the groove 225 can be arranged perpendicular to the straight line where the blade is located. In this way, the bone residue produced by cutting can be discharged. In some possible embodiments, the groove 225 can be arranged on both contraction surfaces, or on one of the contraction surfaces. Multiple grooves 225 can be arranged at intervals on each contraction surface. The depth of the groove 225 should be designed accordingly according to the thickness of the cutting portion 220.

[0063] Reference Figure 2 and Figure 3 , providing a complete embodiment of the utility model. The overall size of the bone cutting tool is 50mm-400mm. The bone cutting tool is provided with a connecting portion 130, a clamping portion 120, a first shank 111, a second shank 112, a contraction portion 211, an extension portion 210 and a cutting portion 220 in sequence. And the connecting portion 130, the clamping portion 120, the first shank 111, the second shank 112, the contraction portion 211, the extension portion 210 and the cutting portion 220 are connected in sequence and integrally formed. The connecting portion 130 is provided with an external thread for connecting the tool to the transducer. The clamping portion 120 is a hexagonal prism structure. By providing the clamping portion 120, it is convenient to clamp the cutting tool, so that it is convenient to connect the tool to the transducer through a tool such as a wrench. The first shank 111 and the second shank 112 are cylindrical, and the diameter of the first shank 111 is smaller than the diameter of the second shank 112. The extension portion 210 and the cutting portion 220 are flat structures, and the angle between the extension portion 210 and the cutting portion 220 is an obtuse angle. The contraction portion 211 is arranged between the second shank 112 and the extension portion 210, and one end of the contraction portion 211 is cylindrical and the other end is flat. Cutting teeth 223 are provided at one end of the cutting portion 220 away from the extension portion 210. Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it; although the utility model is described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that it is still possible to modify the technical solutions recorded in the aforementioned embodiments, or to replace some of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A bone cutting tool, characterized in that: include: Blade(100), The blade head (200) comprises an extension portion (210), wherein the extension portion (210) is connected to the blade body (100), and one end of the extension portion (210) away from the blade body (100) is bent along a direction deviating from the extension direction to form a cutting portion (220); contraction surfaces are provided on both sides of the extension portion (210) and the cutting portion (220) to reduce the width of the blade head (200).

2. The bone cutting tool according to claim 1, characterized in that: The cutting portion (220) includes a knife back (221) and a blade (222); the cutting portion (220) is inclined from one side of the blade (222) to one side of the knife back (221); and the included angle between the extending portion (210) and the cutting portion (220) is an obtuse angle.

3. The bone cutting tool according to claim 2, characterized in that: The cutting portion (220) comprises a contraction section and a cutting section, and the contraction section gradually contracts from one end connected to the extension portion (210) to one end connected to the cutting section.

4. The bone cutting tool according to claim 3, characterized in that: The blade (222) of the cutting section is an arc-shaped structure.

5. The bone cutting tool according to claim 4, characterized in that: At least one of the blade back (221) of the cutting section and the blade edge (222) of the cutting section is provided with cutting teeth (223).

6. The bone cutting tool according to claim 3, characterized in that: The blade back (221) and the blade edge (222) of the cutting section are both provided with cutting teeth (223).

7. The bone cutting tool according to claim 6, characterized in that: An arc-shaped transition section (224) is provided at one end of the cutting section away from the contraction section, and the arc-shaped transition section (224) is provided with cutting teeth (223).

8. The bone cutting tool according to any one of claims 1 to 7, characterized in that: The blade body (100) comprises a blade rod (110) and a connecting portion (130); one end of the blade rod (110) is connected to the blade head (200), and the other end is connected to the connecting portion (130).

9. The bone cutting tool according to claim 8, characterized in that: A clamping portion (120) is provided between the knife rod (110) and the connecting portion (130).

10. The bone cutting tool according to claim 9, characterized in that: The knife bar (110) comprises a first knife bar (111) and a second knife bar (112) connected to each other; One end of the first knife rod (111) away from the second knife rod (112) is connected to the clamping portion (120), and one end of the second knife rod (112) away from the first knife rod (111) is connected to the knife head (200); The diameter of the first cutter bar (111) is different from the diameter of the second cutter bar (112).

Images