Double-edge serrated osteotome
By designing the arc and convex back tooth structure of the double-edged serrated bone cutter and optimizing the cooling channel, the problem of poor cutting quality of existing ultrasonic bone cutters has been solved, achieving a more stable, low-noise and high-precision cutting effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SICHUAN ZHUZHENG ROBOT CO LTD
- Filing Date
- 2025-01-03
- Publication Date
- 2026-05-01
AI Technical Summary
The existing ultrasonic bone scalpel has an unreasonable serrated structure design, which leads to high vibration and noise, uneven friction, excessive heat generation, and poor cutting quality during the cutting process. It is difficult to adapt to the use environment of precise control and low noise operation.
The double-edged serrated bone cutter is designed with an arc-shaped first serration and convex back teeth on the second and third serrations. Combined with the cooling channel, the coolant spray direction is optimized to reduce vibration and noise, and improve cutting accuracy and stability.
It reduces vibration and noise during surgery, improves the smoothness and precision of cutting, reduces heat generation, and results in a smooth bone tissue surface after cutting, making it suitable for precise control and low-noise operation.
Smart Images
Figure CN224179772U_ABST
Abstract
Description
A double-edged serrated bone knife Technical Field
[0001] This application relates to the field of medical device technology, and in particular to a double-edged serrated bone cutter. Background Technology
[0002] The ultrasonic bone scalpel is an innovative technology with many features and advantages that traditional manual and electric orthopedic surgical instruments cannot match. This scalpel utilizes high-intensity focused ultrasound technology, converting electrical energy into mechanical energy through a transducer. The high-frequency ultrasonic vibrations vaporize water within the cells of the tissue it contacts, breaking protein hydrogen bonds and thus completely destroying the bone tissue that needs to be cut during surgery.
[0003] Existing ultrasonic bone scalpels cut bone tissue through a cutting section, which is generally a serrated structure composed of multiple straight back teeth. Due to the unreasonable saw-shaped design of this serrated structure, the tooth surfaces of the straight back teeth directly contact the bone tissue during the cutting process, which easily generates significant vibration and noise. In addition, the friction during the cutting process is large, which easily generates heat, requiring additional cooling measures. Ultimately, the surface of the cut bone tissue may be relatively rough, requiring further processing. The cutting quality is poor, making it difficult to adapt to the use environment of precise control and low-noise operation. Summary of the Invention
[0004] The main purpose of this application is to provide a double-edged serrated bone cutter, which aims to solve the technical problem that the cutting quality of existing ultrasonic bone cutters is easily affected by the unreasonable saw-shaped design of the serrated structure.
[0005] To achieve the above objectives, this application provides a double-edged serrated bone cutter, including a shank connected to a blade, and a cutting section provided on the blade away from the shank. The cutting section includes a first serrated section at the end of the blade and a second and a third serrated section respectively on both sides of the blade. The second and third serrated sections are respectively connected to the two ends of the first serrated section. Both the second and third serrated sections include multiple convex back teeth, and the back of each convex back tooth is an arc shape that protrudes away from the blade.
[0006] Optionally, the lines connecting the tips of the multiple convex back teeth in the second and third sawtooth portions are all straight line segments, while the lines connecting the tips of the teeth in the first sawtooth portion are arc segments.
[0007] Optionally, the arc segment is a segment of an ellipse.
[0008] Optionally, the first serrated portion has multiple semi-circular grooves to form multiple cutting teeth.
[0009] Optionally, a cooling channel is provided inside the tool holder for injecting coolant into the blade. The inlet of the cooling channel extends through the end of the tool holder away from the blade, and the outlet of the cooling channel forms an angle θ with the length direction of the blade, and the angle θ is an acute angle.
[0010] Optionally, the cooling channel includes a liquid injection channel, one end of which is a liquid inlet, and the other end of which is connected to a liquid drain channel, the other end of which is a liquid outlet. The axis of the liquid drain channel forms an angle θ with the length direction of the blade.
[0011] Optionally, the injection channel is coaxially arranged inside the knife holder, and there are two drainage channels arranged symmetrically in a V-shape, with both drainage channels connected to one end of the injection channel.
[0012] Optionally, the included angle θ can range from 20° to 70°.
[0013] Optionally, a transition section connects the tool holder and the cutting tool, the thickness of which gradually decreases towards the cutting tool, and the thickness of the cutting tool gradually decreases away from the tool holder.
[0014] Optionally, the tool holder includes a rod body, on which a disassembly and positioning part is provided. The disassembly and positioning part has four disassembly surfaces, and adjacent disassembly surfaces are perpendicular to each other.
[0015] The beneficial effects that this application can achieve are as follows:
[0016] This application includes a blade holder connected to a blade, with a cutting section located on the blade's side away from the blade holder. The cutting section includes a first serrated portion at the blade tip and second and third serrated portions on either side of the blade. The second and third serrated portions are connected to both ends of the first serrated portion. Each of the second and third serrated portions includes multiple convex back teeth, the back of which are arc-shaped protrusions away from the blade. This application designs the second and third serrated portions on both sides of the blade tip as a structure with multiple convex back teeth. The arc-shaped protrusions on the back of the convex back teeth provide better contact with bone tissue, resulting in smoother cutting and reduced vibration and noise during surgery. Simultaneously, the smoother cutting and more uniform friction distribution reduce heat generation. During cutting, the convex back teeth provide better control and cutting precision, making it suitable for complex surgical procedures. Therefore, the cut bone tissue surface is relatively smooth, reducing the complexity of postoperative treatment. This design is suitable for environments requiring precise control and low-noise operation. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.
[0018] Figure 1 is a schematic diagram of the structure of a double-edged serrated bone knife in an embodiment of this application;
[0019] Figure 2 is a partial enlarged structural diagram of point A in Figure 1;
[0020] Figure 3 is a schematic diagram of the structure of the first saw tooth part in an embodiment of this application, where the line connecting the tips of the teeth is an elliptical arc segment;
[0021] Figure 4 is a schematic diagram of the structure of the top view of Figure 1;
[0022] Figure 5 is a schematic diagram of the internal structure of a double-edged serrated bone knife in an embodiment of this application;
[0023] Figure 6 is a three-dimensional structural diagram of a double-edged serrated bone knife in an embodiment of this application.
[0024] Figure label:
[0025] 100-Tool holder, 110-Bar body, 120-Disassembly and positioning part, 121-Disassembly surface, 200-Blade, 300-Cutting part, 310-First sawtooth part, 311-Semi-circular groove, 312-Cutting tooth, 320-Second sawtooth part, 330-Third sawtooth part, 340-Convex back tooth, 400-Cooling channel, 410-Injection channel, 420-Drainage channel, 500-Transition section.
[0026] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.
[0028] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.
[0029] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0030] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.
[0031] Example
[0032] Referring to Figures 1-6, this embodiment provides a double-edged serrated bone cutter, including a shank 100, a blade 200 connected to the shank 100, and a cutting portion 300 provided on a section of the blade 200 away from the shank 100; wherein, the cutting portion 300 includes a first serrated portion 310 formed at the end of the blade 200 and a second serrated portion 320 and a third serrated portion 330 formed on both sides of the blade 200 respectively, the second serrated portion 320 and the third serrated portion 330 being connected to both ends of the first serrated portion 310 respectively, and both the second serrated portion 320 and the third serrated portion 330 including a plurality of convex back teeth 340, the back of the convex back teeth 340 being an arc shape protruding away from the blade 200.
[0033] In this embodiment, the second serrated portion 320 and the third serrated portion 330 on both sides of the blade 200 end are designed as a structure of multiple convex back teeth 340. The arc-shaped protrusion on the back of the convex back teeth 340 has better fit with bone tissue, making the cutting more stable and reducing vibration and noise during the operation. At the same time, because the cutting is more stable, the friction force is more evenly distributed, reducing heat generation. During the cutting process, the convex back teeth 340 can provide better control and cutting precision, making it suitable for complex surgical operations. Therefore, the surface of the cut bone tissue is relatively smooth, reducing the complexity of postoperative treatment. Thus, it is suitable for use in environments requiring precise control and low noise operation.
[0034] It should be noted that the first serrated part 310 is mainly used to cut human tissue, while the second serrated part 320 and the third serrated part 330 are used to cut bone tissue, thus forming a double-edged serrated cutting structure. The second serrated part 320 or the third serrated part 330 of the corresponding length can be selected according to the required cutting position.
[0035] When selecting the blade tooth shape for an ultrasonic bone scalpel, the following factors need to be considered:
[0036] Surgical type: Different types of surgery have different requirements for cutting efficiency and precision. Fine surgery usually requires higher control and precision, and may be more suitable for using the convex back tooth 340.
[0037] Bone type: Hard bone and cartilage have different requirements for cutting tools. Hard bone may be more suitable for straight back teeth, while cartilage may be more suitable for convex back teeth 340.
[0038] Surgical environment: In environments requiring rapid cutting and efficient operation, straight back teeth may be more advantageous, while in environments requiring precise control and low-noise operation, convex back teeth 340 may be more suitable.
[0039] Cost and maintenance: Straight back teeth are less expensive and easier to maintain, but may not be as effective as convex back teeth 340 in complex surgeries.
[0040] By comprehensively considering the above factors, a better choice can be made regarding the ultrasonic bone scalpel tooth design to suit specific needs, thereby achieving the best surgical results and efficiency.
[0041] As an optional implementation, the lines connecting the tips of the plurality of convex back teeth 340 in the second serrated portion 320 and the third serrated portion 330 are all straight segments, while the lines connecting the tips of the first serrated portion 310 are arc segments.
[0042] In this embodiment, since the second serrated portion 320 and the third serrated portion 330 mainly cut bone tissue, their outer edge contours are generally straight, while the first serrated portion 310 plays the role of cutting human tissue, so its outer edge contours are generally curved, so as to be suitable for different operating scenarios.
[0043] As an optional implementation, the arc segment is elliptical in shape. Compared to the conventional structure where the outer edge of the first serrated part 310 has a circular arc shape, the outer edge of the first serrated part 310 here has an elliptical arc shape, which can increase the blade length and improve the service life of the bone knife. The arc segment can be designed as a semi-elliptical or quarter-elliptical length structure, or a combination of the two elliptical lengths, thus making it suitable for various application scenarios with different needs.
[0044] As an alternative implementation, the first serrated portion 310 has a plurality of semi-circular grooves 311 to form a plurality of cutting teeth 312, which can be used to cut human tissue.
[0045] As an optional implementation, a cooling channel 400 is provided inside the tool holder 100. The cooling channel 400 is used to inject coolant into the blade 200. The inlet of the cooling channel 400 extends through the end of the tool holder 100 away from the blade 200. The outlet direction of the cooling channel 400 forms an angle θ with the length direction of the blade 200, and the angle θ is an acute angle.
[0046] In this embodiment, the angle θ between the outlet direction of the cooling channel 400 and the blade 200 is optimized, which allows the coolant to be sprayed closer to the blade 200 when it is sprayed from the outlet of the cooling channel 400. This reduces the risk of the coolant being dispersed by ultrasonic vibration, improves the adhesion performance of the coolant on the blade 200 after it is ejected, and increases the amount of coolant flowing to the tip of the blade 200, thereby improving the cooling effect on the blade 200.
[0047] As an optional implementation, the cooling channel 400 includes a liquid injection channel 410, one end of which is a liquid inlet, and the other end of which is connected to a liquid discharge channel 420, the other end of which is a liquid outlet. The axis of the liquid discharge channel 420 forms an angle θ with the length direction of the blade 200.
[0048] In this embodiment, since the outlet needs to be arranged at an angle θ relative to the blade 200, the cooling channel 400 is designed as a multi-segment channel structure consisting of an injection channel 410 and a drainage channel 420. The relative angle between the injection channel 410 and the drainage channel 420 is θ. The coolant enters through the straight injection channel 410 and then exits through the drainage channel 420 at an angle θ. It should be noted that the axial direction of the drainage channel 420 should be close to the plane of the blade 200 so that the sprayed coolant can effectively adhere to the plane of the blade 200, ensuring the adhesion effect.
[0049] As an optional implementation, the injection channel 410 is coaxially disposed within the knife bar 100, and two drainage channels 420 are provided and arranged symmetrically in a V-shape, with both drainage channels 420 simultaneously connected to one end of the injection channel 410.
[0050] In this embodiment, since the blade 200 has two planes, two drainage channels 420 are provided that can be close to the planes of the blade 200 respectively. The coolant in the injection channel 410 can be divided into two streams and sprayed from the drainage channel 420 to the corresponding planes of the blade 200, which further improves the coverage of the coolant on the blade 200 and improves the cooling effect.
[0051] As an optional implementation, the included angle θ can be in the range of 20° to 70°, which can meet the requirements of the adhesion ability of the coolant after it is discharged. Considering the requirements of the discharge adhesion ability and the processing difficulty, the included angle θ is preferably 45°, that is, the two discharge channels 42° are perpendicular to each other.
[0052] As an optional implementation, a transition section 500 is connected between the tool holder 100 and the blade 200. The thickness of the transition section 500 gradually decreases towards the blade 200, and the thickness of the blade 200 gradually decreases away from the tool holder 100.
[0053] In this embodiment, since the tool holder 100 is generally a long cylindrical rod, while the blade 200 is a thin sheet structure, the two are connected by a transition section 500. The transition section 500 adopts a thickness gradient design, which can improve the strength of the connection structure of the blade 200 and reduce the risk of the blade 200 breaking or deforming. Similarly, by designing the thickness of the blade 200 gradually, the structural strength of the blade 200 can be further improved, thereby increasing the service life of the blade 200.
[0054] As an optional implementation, the tool holder 100 includes a rod body 110, on which a disassembly positioning part 120 is provided. The disassembly positioning part 120 has four disassembly surfaces 121, and adjacent disassembly surfaces 121 are perpendicular to each other.
[0055] In this embodiment, the rod 110 is a long cylindrical rod. Since the rod 110 needs to be used in conjunction with the ultrasonic instrument, after use, the tool rod 100 can be removed from the ultrasonic instrument by clamping the disassembly positioning part 120 with a wrench. Here, four disassembly surfaces 121 are designed to cooperate with the wrench, which can facilitate quick positioning and clamping with the wrench and improve the ease of operation.
[0056] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.
Claims
1. A double-edged serrated bone cutter, characterized in that, The device includes a blade holder connected to a blade, and a cutting section is provided on a portion of the blade away from the blade holder. The cutting section includes a first serrated portion formed at the end of the blade and a second serrated portion and a third serrated portion formed on both sides of the blade. The second serrated portion and the third serrated portion are respectively connected to both ends of the first serrated portion. Both the second serrated portion and the third serrated portion include multiple convex back teeth, and the back of each convex back tooth is an arc shape that convexes away from the blade.
2. The double-edged serrated bone cutter as described in claim 1, characterized in that, The lines connecting the tips of the multiple convex back teeth in the second and third sawtooth portions are all straight segments, while the lines connecting the tips of the teeth in the first sawtooth portion are arc segments.
3. A double-edged serrated bone cutter as described in claim 2, characterized in that, The arc segment is a segment of an ellipse.
4. A double-edged serrated bone cutter as described in any one of claims 1-3, characterized in that, The first sawtooth portion has multiple semi-circular grooves to form multiple cutting teeth.
5. A double-edged serrated bone cutter as described in claim 1, characterized in that, The tool holder has a cooling channel for injecting coolant into the blade. The inlet of the cooling channel extends through the end of the tool holder away from the blade. The outlet of the cooling channel forms an angle θ with the length direction of the blade, and the angle θ is an acute angle.
6. A double-edged serrated bone cutter as described in claim 5, characterized in that, The cooling channel includes a liquid injection channel, one end of which is the liquid inlet, and the other end of which is connected to a liquid discharge channel, the other end of which is the liquid outlet. The axis of the liquid discharge channel forms an angle θ with the length direction of the blade.
7. A double-edged serrated bone cutter as described in claim 6, characterized in that, The injection channel is coaxially disposed inside the knife bar, and there are two drainage channels arranged symmetrically in a V-shape. The two drainage channels are simultaneously connected to one end of the injection channel.
8. A double-edged serrated bone cutter as described in claim 5 or 6, characterized in that, The included angle θ ranges from 20° to 70°.
9. A double-edged serrated bone cutter as described in claim 1, characterized in that, A transition section connects the tool holder and the blade. The thickness of the transition section gradually decreases towards the blade, while the thickness of the blade gradually decreases away from the tool holder.
10. A double-edged serrated bone cutter as described in claim 1, characterized in that, The tool holder includes a rod body, on which a disassembly and positioning part is provided. The disassembly and positioning part has four disassembly surfaces, and adjacent disassembly surfaces are perpendicular to each other.