Ultrasonic bone cutting device and bone cutter thereof

Abstract

According to the ultrasonic bone cutting device and the bone cutting tool thereof, in the process that bone tissue is cut through a cutting edge of a cutting edge section, cooling liquid can reach a friction heat generation area of the cutting edge section and the bone tissue through a liquid injection channel, a communication through hole and a flow guide channel, and therefore a tool bit body can be effectively cooled in time; and thermal damage is avoided. Meanwhile, due to the fact that the communicating through hole communicating with the liquid injection channel and the flow guide channel penetrates through part of the operation plane and part of the cutting edge face, that is, part of the communicating through hole is formed in the tightening section, the strength of the cutting edge section is not or slightly affected, and the risk of breakage is avoided.

Description

Ultrasonic bone cutting device and bone cutting blade Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to an ultrasonic bone cutting device and its bone cutting blade. Background Technology

[0002] Ultrasonic osteotomy devices convert electrical energy into high-frequency mechanical energy to cut bone tissue and are widely used in clinical surgery. During the cutting process, the osteotomy blade generates a large amount of heat through friction with the bone tissue. If the osteotomy blade is not cooled in time, it can cause thermal damage. One traditional method is to slowly immerse coolant into the gap between the osteotomy blade and the bone tissue for cooling, but this method is ineffective. Another traditional method is to create a coolant injection hole in the cutting edge of the osteotomy blade to deliver coolant, but this method affects the strength of the osteotomy blade and increases the risk of breakage. Summary of the Invention

[0003] Therefore, it is necessary to provide an ultrasonic bone cutting device and its cutting blade to address the problem that bone cutting tools cannot simultaneously achieve heat dissipation and high strength.

[0004] The technical solution is as follows:

[0005] On one hand, a bone-cutting tool is provided, including a connector and a blade body. The connector is used to connect to a handle. The blade body includes a tightening section and a cutting edge section. One end of the tightening section is connected to the connector, and the other end is connected to the cutting edge section. The tightening section has an operating plane, and the cutting edge section has a cutting edge. The operating plane and the cutting edge are located on the same side of the blade body and are connected to each other. The connector has an axially extending injection channel, and the blade body has an axially extending guide channel that communicates with the injection channel. A portion of the guide channel radially penetrates a portion of the operating plane and a portion of the cutting edge to form a through hole.

[0006] The technical solution will be further explained below:

[0007] In one embodiment, along the axial direction, a portion of the connecting hole is located on the operating plane and another portion is located on the cutting edge surface, and along the axial direction, the length of the connecting hole on the operating plane is greater than the length of the connecting hole on the cutting edge surface.

[0008] In one embodiment, along the axial direction, the length of the connecting hole on the operating plane is L1, and the length of the connecting hole on the cutting edge is L2, wherein L1 / L2 = 2.

[0009] In one embodiment, the flow channel extends axially from the tightening section to the front end of the blade section.

[0010] In one embodiment, the flow channel located at the blade section is provided with a flow groove. Along the axial direction, one end of the flow groove is connected to the through hole, and the other end of the flow groove is connected to the flow channel located at the front end of the blade section. The width of the flow groove decreases in the direction away from the tightening section.

[0011] In one embodiment, the tightening section and the cutting edge section are connected in an arc-shaped transition.

[0012] In one embodiment, the cutting edge segment has a pair of cutting edges that are inclined relative to the axis of the cutting head body along the longitudinal direction, and at least one of the cutting edges is provided with a plurality of cutting teeth.

[0013] In one embodiment, each of the cutting teeth has a tooth tip, a first cutting edge located on one side of the tooth tip, and a second cutting edge located on the other side of the tooth tip, wherein the angle between the first cutting edge and the normal of the cutting edge is equal to the angle between the second cutting edge and the normal of the cutting edge.

[0014] In one embodiment, there are two operating planes, which are arranged radially and spaced apart from each other along the tightening section. There are also two cutting edges, which are arranged one-to-one with the two operating planes. The connecting hole passes through the two opposing operating planes, and each cutting edge is provided with a flow guide channel.

[0015] On the other hand, an ultrasonic bone-cutting device is provided, including a handle and the bone-cutting blade, wherein the handle is connected to the connector and the bone-cutting blade is tightened and fixed to the handle through the tightening section.

[0016] The ultrasonic bone-cutting device and its cutting blade described in the above embodiments, during the cutting process of bone tissue using the blade segment, allow coolant to reach the friction-generated heat area between the blade segment and the bone tissue through the injection channel, connecting holes, and guide channels. This enables timely and effective cooling of the blade body, preventing thermal damage. Simultaneously, since the connecting holes, which are connected to both the injection channel and the guide channels, penetrate part of the operating plane and part of the blade surface (i.e., a portion of the connecting holes is provided on the tightening section), the strength of the blade segment is not affected or is minimally affected, avoiding the risk of breakage. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 is a schematic diagram of the structure of a bone-cutting tool according to an embodiment from a single perspective;

[0020] Figure 2 is a structural schematic diagram of the bone-cutting tool in Figure 1 from another perspective;

[0021] Figure 3 is a magnified view of part A of the bone-cutting tool in Figure 2.

[0022] Explanation of reference numerals in the attached figures:

[0023] 10. Bone-cutting tool; 100. Connector; 110. Fluid injection channel; 200. Blade body; 210. Tightening section; 211. Operating plane; 220. Blade section; 221. Blade face; 222. Front end; 223. Blade; 224. Cutting tooth; 2241. Tooth tip; 2242. First tooth edge; 2243. Second tooth edge; 230. Flow channel; 231. Through hole; 232. Flow groove. Detailed Implementation

[0024] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0025] As shown in Figure 1, in one embodiment, an ultrasonic bone cutting device is provided, which includes a handle (not shown) and a bone cutting blade 10, which can be mounted on the handle to cut bone tissue.

[0026] The handle can be an existing component. A transducer can be installed on the handle to convert high-frequency electrical signals into mechanical vibrations of the bone-cutting tool 10. Since it is an existing component, it will not be described in detail here.

[0027] It should be noted that the ultrasonic bone cutting device may also include components such as an ultrasonic generator, but since these are existing components, they will not be described in detail here.

[0028] As shown in Figures 1 and 2, in one embodiment, a bone-cutting tool 10 is provided, including a connector 100 and a blade body 200.

[0029] The connector 100 is used to connect with the handle to realize the assembly connection between the bone cutting tool 10 and the handle.

[0030] The blade body 200 can be made of alloy or other metal materials to meet medical requirements. The blade body 200 includes a tightening section 210 and a cutting edge section 220. One end of the tightening section 210 is connected to the connector 100, and the other end is connected to the cutting edge section 220. The cutting edge section 220 can cut bone tissue. Optionally, the blade body 200 can vibrate at high frequency in the vertical direction, causing the cutting edge 223 on the cutting edge section 220 to cut bone tissue.

[0031] Optionally, the connector 100 and the tightening section 210 are integrally formed, which facilitates processing and also helps to improve the connection strength.

[0032] As shown in Figures 1 and 2, the tightening section 210 is provided with an operating surface 211. Thus, when connecting the connector 100 to the handle, in order to ensure the stability of the connection, a wrench or other tool can be placed on the flat operating surface 211 to apply force to the entire bone cutting tool 10, thereby enabling the connector 100 to achieve a stable and reliable assembly connection with the handle.

[0033] Optionally, the tightening section 210 is cylindrical, and a flat operating surface 211 is provided on the arc side wall of the tightening section 210, so that tools such as wrenches or sockets can be fitted on the operating surface 211 to apply torque to the tightening section 210, thereby enabling the connector 100 and the handle to achieve a stable and reliable assembly connection.

[0034] Optionally, the connector 100 has an external thread and the handle has an internal thread, or the connector 100 has an internal thread and the handle has an external thread. The connection between the external and internal threads is used to assemble the bone-cutting tool 10 and the handle. Moreover, by applying torque to the tightening section 210 after a tool such as a wrench or socket is placed on the operating plane 211, the internal and external threads are more tightly and stably engaged, thereby enabling the bone-cutting tool 10 to achieve a stable and reliable tightened assembly connection with the handle, preventing loosening during the cutting process.

[0035] As shown in Figures 1 and 2, the cutting edge section 220 has a cutting edge surface 221, and the operating plane 211 and the cutting edge surface 221 are located on the same side of the cutter head body 200, and the cutting edge surface 221 and the operating plane 211 are connected to each other. Furthermore, the connector 100 has an axially extending injection channel 110. Simultaneously, the cutter head body 200 has an axially extending guide channel 230 that communicates with the injection channel 110. A portion of the guide channel 230 radially penetrates a portion of the operating plane 211 and a portion of the cutting edge surface 221 to form a through hole 231.

[0036] Optionally, the blade segment 220 is flat and has a tip and a blade 223, which cuts bone tissue using the high-frequency vibrating blade 223.

[0037] In the bone-cutting tool 10 of the above embodiment, during the cutting of bone tissue using the cutting edge 223 of the cutting edge 220, coolant can reach the friction-generated heat area between the cutting edge 220 and the bone tissue through the injection channel 110, the connecting hole 231, and the guide channel 230. This allows for timely and effective cooling of the blade body 200, preventing thermal damage. Simultaneously, since the connecting hole 231, which communicates with both the injection channel 110 and the guide channel 230, penetrates part of the operating plane 211 and part of the cutting edge 221 (i.e., a partial connecting hole 231 is provided on the tightening section 210), it does not significantly affect the strength of the cutting edge 220, avoiding the risk of breakage.

[0038] The through hole 231 can be set on both the tightening section 210 and the cutting edge section 220. On the one hand, by making full use of the tightening section 210 with a larger diameter to make the hole, the stress value of the bone cutting tool can be adjusted to the maximum extent, so that the stress of the bone cutting tool is not concentrated on the end of the tool, thereby increasing the strength of the cutting edge section 220 and avoiding breakage. On the other hand, the vibration frequency of the bone cutting tool can also be adjusted to achieve good cutting efficiency.

[0039] As shown in Figures 1 and 2, in one embodiment, along the axial direction, a portion of the connecting hole 231 is located on the operating plane 211, and another portion is located on the cutting edge 221. Furthermore, along the axial direction, the length of the connecting hole 231 on the operating plane 211 is greater than the length of the connecting hole 231 on the cutting edge 221. Thus, by arranging as many connecting holes 231 as possible on the tightening section 210, not only is the cutting edge 220 guaranteed to have high strength and prevent breakage, but the vibration frequency of the blade body 200 also meets the requirements for cutting bone tissue, which is beneficial for the normal progress of the surgery.

[0040] The specific length of the through hole 231 along the axial direction on the operating plane 211 can be flexibly adjusted or designed according to actual usage requirements. For example, it can be 3.8mm to 4.2mm (specifically, it can be 3.8mm, 3.9mm, 4mm, 4.1mm or 4.2mm).

[0041] The specific length of the through hole 231 along the axial direction on the cutting edge 221 can be flexibly adjusted or designed according to actual usage requirements. For example, it can be 1.8mm to 2.2mm (specifically, it can be 1.8mm, 1.9mm, 2mm, 21mm or 2.2mm).

[0042] As shown in Figure 2, in one embodiment, along the axial direction, the length of the through hole 231 on the operating plane 211 is L1, and the length of the through hole 231 on the cutting edge 221 is L2, where L1 / L2 = 2. This ensures that the cutting edge segment 220 has sufficient strength to prevent breakage, and that the vibration frequency of the blade body 200 is close to the cutting frequency required for bone tissue, which is beneficial for the normal progress of the surgery.

[0043] Optionally, the length L1 of the through hole 231 on the operating plane 211 is 4 mm, and the length L2 of the through hole 231 on the cutting edge 221 is 2 mm.

[0044] Optionally, the flow channel 230 extends axially from the tightening section 210 to the front end 222 of the cutting edge section 220. In this way, the flow channel 230 guides the coolant to flow axially through the entire cutting edge section 220, allowing the coolant to reach the entire frictional heat-generating area between the cutting edge section 220 and the bone tissue, enabling timely and effective cooling and preventing thermal damage.

[0045] It should be noted that, in the embodiments of this application, the front end 222 of the blade segment 220 refers to the end of the blade segment 220 that is away from the tightening segment 210.

[0046] As shown in Figures 1 and 2, in one embodiment, the flow channel 230 located at the blade section 220 is provided with a flow groove 232. Along the axial direction, one end of the flow groove 232 communicates with the through hole 231, and the other end of the flow groove 232 communicates with the flow channel 230 located at the front end portion 222 of the blade section 220. Furthermore, the width of the flow groove 232 (as shown by D in Figure 2) decreases in the direction away from the tightening section 210. Thus, the coolant flowing out from the through hole 231 enters the flow groove 232 and, under the pull of capillary action, flows towards the front end portion 222 of the blade section 220, thereby better reaching the frictional heat-generating area between the blade section 220 and the bone tissue, which is beneficial for improving the cooling effect.

[0047] Optionally, the depth of the guide groove 232 is greater than the depth of the guide channel 230, which helps to enhance capillary action and guide the coolant flowing out of the through hole 231 through the guide groove 232 to flow towards the front end 222 of the blade section 220, so that the coolant can better reach the frictional heat generation area between the blade section 220 and the bone tissue, which helps to improve the cooling effect.

[0048] In one embodiment, the tightening section 210 and the cutting edge section 220 are connected in an arc-shaped transition. This avoids stress concentration that could lead to breakage, ensures connection strength, and also prevents scratching of other tissues.

[0049] As shown in Figures 1 and 2, in one embodiment, the cutting edge segment 220 has a pair of cutting edges 223 arranged obliquely relative to the axis of the cutting head body 200 along the longitudinal direction to prevent jamming during cutting. Furthermore, at least one of the cutting edges 223 is provided with multiple cutting teeth 224, thus achieving not only a cutting effect but also a sawing effect. Simultaneously, during high-frequency vibration, the cutting head body 200 utilizes the cutting teeth 224 to perform frictional cutting of bone tissue, improving cutting efficiency and quality.

[0050] As shown in Figure 2, each cutting tooth 224 further comprises a tooth tip 2241, a first cutting edge 2242 located on one side of the tooth tip 2241, and a second cutting edge 2243 located on the other side of the tooth tip 2241. Furthermore, the angle between the normal of the first cutting edge 2242 and the normal of the cutting edge 223 (as shown by α in Figure 2) is equal to the angle between the normal of the second cutting edge 2243 and the normal of the cutting edge 223 (as shown by β in Figure 2). This ensures that the orientation of the entire cutting tooth 224 is consistent with or substantially consistent with the vibration direction of the cutting edge segment 220, enabling effective frictional cutting with bone tissue during high-frequency vibration, thereby improving cutting efficiency and quality.

[0051] In one embodiment, the angle between the normal of the first tooth 2242 and the blade 223 and the angle between the normal of the second tooth 2243 and the blade 223 are both 30° (of course, in other embodiments, other angles are also possible), so that the orientation of the cutting tooth 224 is consistent with or substantially consistent with the vibration direction of the blade segment 220, which can effectively perform frictional cutting with bone tissue during high-frequency vibration, thereby improving cutting efficiency and cutting quality.

[0052] In one embodiment, there are two operating planes 211, which are arranged radially and spaced apart from each other along the tightening section 210. There are also two cutting edges 221, each corresponding to one of the two operating planes 211. Furthermore, the connecting hole 231 penetrates both opposing operating planes 211, and each cutting edge 221 is provided with a flow channel 230. This allows coolant to flow to both sides of the cutting edge 220, reaching the frictional heat-generating area between the cutting edge 220 and the bone tissue, thereby enabling more timely and effective cooling of the blade body 200 and preventing thermal damage.

[0053] It should be noted that "a certain body" or "a certain part" can be a portion of the corresponding "component," meaning that "a certain body" or "a certain part" is integrally formed and manufactured with the "other parts of the component"; or it can be an independent component that can be separated from the "other parts of the component," meaning that "a certain body" or "a certain part" can be manufactured independently and then combined with the "other parts of the component" to form a whole. The expression of "a certain body" or "a certain part" in this application is only one embodiment for ease of reading, and is not intended to limit the scope of protection of this application. Any technical solution that includes the above features and has the same function should be understood as an equivalent technical solution of this application.

[0054] It should be noted that the components included in the terms "unit," "component," "mechanism," and "device" of this application can be flexibly combined, enabling modular production according to actual needs and facilitating modular assembly. The division of the above-mentioned components in this application is merely one embodiment for ease of reading and is not intended to limit the scope of protection of this application. Any solution that includes the above-mentioned components and has the same function should be understood as an equivalent technical solution of this application.

[0055] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. The term "and / or" used in this utility model includes any and all combinations of one or more of the related listed items.

[0056] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0057] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0058] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0059] It should be noted that when a component is referred to as "fixed to," "set on," "fixed to," or "mounted on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component. Furthermore, when a component is considered to be "fixed transmission connection" to another component, the two can be fixed in a detachable or non-detachable manner, as long as power transmission can be achieved, such as sleeve, snap-fit, integral molding, welding, etc., which can be achieved in the prior art and will not be elaborated here. When a component is perpendicular or approximately perpendicular to another component, it means that the two are ideally perpendicular, but due to the influence of manufacturing and assembly, there may be a certain degree of perpendicularity error. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation. The term "and / or" used herein includes any and all combinations of one or more of the associated listed items.

[0060] It should also be understood that, in interpreting the connection or positional relationships of components, although not explicitly described, connection and positional relationships are interpreted to include a range of error, which should be within the acceptable deviation range of a specific value as determined by a person skilled in the art. For example, "approximately," "about," or "substantially" can mean within one or more standard deviations, without limitation herein.

[0061] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A bone cutting tool, characterized in that, The device includes a connector and a blade body. The connector is used to connect to a handle. The blade body includes a tightening section and a cutting edge section. One end of the tightening section is connected to the connector, and the other end is connected to the cutting edge section. The tightening section has an operating plane, and the cutting edge section has a cutting edge. The operating plane and the cutting edge are located on the same side of the blade body and are connected to each other. The connector has an axially extending injection channel, and the blade body has an axially extending guide channel that communicates with the injection channel. A portion of the guide channel radially penetrates a portion of the operating plane and a portion of the cutting edge to form a through hole.

2. The osteotomy cutter of claim 1, wherein, Along the axial direction, a portion of the connecting hole is located on the operating plane, and another portion is located on the cutting edge surface. Furthermore, along the axial direction, the length of the connecting hole on the operating plane is greater than the length of the connecting hole on the cutting edge surface.

3. The osteotomy cutter of claim 2, wherein, Along the axial direction, the length of the through hole on the operating plane is L1, and the length of the through hole on the cutting edge is L2, where L1 / L2 = 2.

4. The bone-cutting tool according to claim 1, characterized in that, The flow channel extends axially from the tightening section to the front end of the blade section.

5. The osteotomy cutter of claim 4, wherein, The flow channel located at the blade section is provided with a flow groove. Along the axial direction, one end of the flow groove is connected to the through hole, and the other end of the flow groove is connected to the flow channel located at the front end of the blade section. The width of the flow groove decreases in the direction away from the tightening section.

6. The osteotomy cutter of claim 1, wherein, The tightening section and the cutting edge section are connected in an arc-shaped transition.

7. The osteotomy cutter of any one of claims 1 to 6, wherein, The blade segment has a pair of blades that are inclined relative to the axis of the blade body along the longitudinal direction, and at least one of the blades is provided with a plurality of cutting teeth.

8. The osteotomy cutter of claim 7, wherein, Each of the cutting teeth has a tooth tip, a first cutting edge located on one side of the tooth tip, and a second cutting edge located on the other side of the tooth tip, wherein the angle between the first cutting edge and the normal of the cutting edge is equal to the angle between the second cutting edge and the normal of the cutting edge.

9. The bone-cutting tool according to any one of claims 1 to 6, characterized in that, There are two operating planes, which are arranged radially and spaced apart from each other along the tightening section. There are two blade surfaces, which are arranged one-to-one with the two operating planes. The connecting hole passes through the two opposing operating planes. Each blade surface is provided with a flow guide channel.

10. An ultrasonic osteotomy device, comprising: Includes a handle and a bone-cutting knife as described in any one of claims 1 to 9, wherein the handle is connected to the connector and the bone-cutting knife is tightened and fixed to the handle via the tightening section.

Images