Ultrasonic osteotome head and ultrasonic osteotome system

Abstract

The utility model provides an ultrasonic osteotome head and an ultrasonic osteotome system. The ultrasonic osteotome system comprises an ultrasonic host, a transducer and the ultrasonic osteotome head. The ultrasonic osteotome head comprises a cutter bar part, a cutting part and a stepped hole extending and penetrating through the cutter bar part and the cutting part, the stepped hole comprises a large-diameter hole section and a small-diameter hole section, the small-diameter hole section extends to the large-diameter hole section from the end face, away from the cutter bar part, of the cutting part, and the large-diameter hole section extends to the small-diameter hole section from the end face, away from the cutting part, of the cutter bar part. The minimum hole diameter of the large-diameter hole section is larger than the maximum hole diameter of the small-diameter hole section. According to the ultrasonic osteotome head, by arranging the large-diameter hole section and the small-diameter hole section, on the premise that the aperture of the small-diameter hole section is designed to guarantee the cutting rigidity of the head end, the inner diameter of the large-diameter hole section can be set to be larger than that of the small-diameter hole section, the mass of the tail end is further reduced, the weight of the whole ultrasonic osteotome head is reduced, and the cost is reduced. The ultrasonic energy loss of the ultrasonic osteotome head is reduced, and the cutting efficiency of the ultrasonic osteotome system is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of medical devices, and more particularly relates to an ultrasonic bone cutter head and an ultrasonic bone cutter system. BACKGROUND

[0002] The ultrasonic bone cutter is a surgical tool which realizes cutting and grinding of bone tissue through a high-frequency longitudinal vibration cutter head by converting electric energy into mechanical energy. The ultrasonic bone cutter head is an important component of the ultrasonic bone cutter, and the design and function of the ultrasonic bone cutter head play an important role in improving the accuracy, reliability and safety of surgery. However, the weight of the ultrasonic bone cutter head in the prior art is large, resulting in a large loss of ultrasonic energy and affecting the cutting efficiency. CONTENT OF THE UTILITY MODEL

[0003] The purpose of the embodiment of the application is to provide an ultrasonic bone cutter head and an ultrasonic bone cutter system to solve the technical problem of large energy loss of the ultrasonic bone cutter head in the prior art.

[0004] To achieve the above-mentioned purpose, the technical scheme adopted by the application is as follows: an ultrasonic bone cutter head is provided, which comprises a cutter rod part, a cutting part and a stepped hole extending through the cutter rod part and the cutting part, the stepped hole comprises a large-diameter hole section and a small-diameter hole section, the small-diameter hole section extends from an end face of the cutting part away from the cutter rod part to the large-diameter hole section, the large-diameter hole section extends from an end face of the cutter rod part away from the cutting part to the small-diameter hole section, and the minimum hole diameter of the large-diameter hole section is greater than the maximum hole diameter of the small-diameter hole section.

[0005] In some embodiments, the center line of the small-diameter hole section, the center line of the large-diameter hole section and the center line of the ultrasonic bone cutter head coincide.

[0006] In some embodiments, the large-diameter hole section is a cylindrical hole or a hole with a gradually changing inner diameter.

[0007] The small-diameter hole section is a cylindrical hole or a hole with a gradually changing inner diameter.

[0008] In some embodiments, the hole diameter of the large-diameter hole section is less than one-half of the minimum outer diameter of the part of the ultrasonic bone cutter head corresponding to the large-diameter hole section.

[0009] The hole diameter of the small-diameter hole section is less than one-half of the minimum outer diameter of the part of the ultrasonic bone cutter head corresponding to the small-diameter hole section.

[0010] In some embodiments, the inner diameter of the small-diameter hole section ranges from 0.8mm to 1.25mm.

[0011] In some embodiments, the inner diameter of the large-diameter hole section ranges from 1.3 mm to 1.9 mm.

[0012] In some embodiments, the cutter bar section comprises a first bar section, a second bar section and a third bar section arranged in sequence along the axial direction of the cutter bar section, the outer diameters of the first bar section, the second bar section and the third bar section decrease in sequence, a first transition section is connected between the first bar section and the second bar section, a second transition section is connected between the second bar section and the third bar section, and a cutting section is connected to the end of the third bar section away from the second bar section; the stepped hole sequentially passes through the first bar section, the first transition section, the second bar section, the second transition section, the third bar section and the cutting section.

[0013] In some embodiments, the small-diameter hole section and the large-diameter hole section are connected at a position of the third bar section close to the second transition section.

[0014] Alternatively, the small-diameter hole section and the large-diameter hole section are connected at the second transition section.

[0015] Alternatively, the small-diameter hole section and the large-diameter hole section are connected at a position of the second bar section close to the second transition section.

[0016] In some embodiments, the surface of the second bar section is formed with a plurality of inclined grooves uniformly distributed in the circumferential direction.

[0017] In some embodiments, the starting end of the inclined groove is located at the connection between the first transition section and the second bar section.

[0018] Alternatively, the starting end of the inclined groove is located at the second bar section.

[0019] In some embodiments, the ending end of the inclined groove is located at the connection between the second bar section and the second transition section.

[0020] Alternatively, the ending end of the inclined groove is located at the second bar section.

[0021] In some embodiments, the cutting section comprises a cylindrical section connected to the cutter bar section and a plurality of gear rings arranged on the surface of the cylindrical section and spaced along the axial direction of the cylindrical section, each of the gear rings comprises a plurality of cutting teeth spaced along the circumferential direction of the cylindrical section, and the plurality of gear rings comprises at least three types of gear rings.

[0022] In some embodiments, the gear ring comprises a first tooth profile gear ring, a second tooth profile gear ring and a third tooth profile gear ring, the first tooth profile gear ring is arranged on the circumferential side of the cylindrical segment and is adjacent to the end face of the distal end of the cylindrical segment, the second tooth profile gear ring comprises a plurality of second tooth profile gear rings, and the plurality of second tooth profile gear rings are arranged on the circumferential side of the cylindrical segment and are axially spaced along the cylindrical segment; the third tooth profile gear ring is arranged on the circumferential side of the cylindrical segment and is between the first tooth profile gear ring and the second tooth profile gear ring.

[0023] In some embodiments, the axial spacing of the cutting teeth of adjacent gear rings is greater than 2 times the amplitude of the cutting portion.

[0024] In some embodiments, the cutting teeth of adjacent gear rings are arranged in a circumferential staggered manner along the cylindrical segment.

[0025] In another aspect, the application also provides an ultrasonic bone knife system, comprising an ultrasonic host, a transducer and the above-mentioned ultrasonic bone knife head, the transducer is connected with the ultrasonic bone knife head, the ultrasonic host provides electric energy for the transducer, and the transducer is used for converting the electric energy into mechanical vibration.

[0026] The ultrasonic bone knife head and the ultrasonic bone knife system provided by the application have the beneficial effects that: by designing a stepped hole in the ultrasonic bone knife head, and extending the small-diameter hole segment from the end face of the cutting portion away from the shank portion to the large-diameter hole segment, and extending the large-diameter hole segment from the end face of the shank portion away from the cutting portion to the small-diameter hole segment, that is, the hole diameter of the large-diameter hole segment corresponding to the shank portion is greater than the hole diameter of the small-diameter hole segment corresponding to the cutting portion, in this way, the hole diameter of the small-diameter hole segment can be designed to ensure the cutting stiffness of the cutting portion, and at the same time, the inner diameter of the large-diameter hole segment can be set to be greater than that of the small-diameter hole segment, so as to further reduce the mass of the shank portion, thereby reducing the weight of the entire ultrasonic bone knife head, reducing the ultrasonic energy loss of the ultrasonic bone knife head, and improving the cutting efficiency of the ultrasonic bone knife system. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative effort.

[0028] Figure 1 A perspective structural schematic diagram of the ultrasonic bone knife head provided by the embodiments of the application is shown in the figure.

[0029] Figure 2 An axial cross-sectional structural schematic diagram of the ultrasonic bone knife head provided by the embodiments of the application is shown in the figure.

[0030] Figure 3 A structure diagram of a cutting portion of an ultrasonic osteotome head provided by an embodiment of the present application is shown in FIG. 1.

[0031] Figure 4 A structure diagram of a cutting portion of an ultrasonic osteotome head provided by another embodiment of the present application is shown in FIG. 2.

[0032] In the drawings, various reference numbers refer to:

[0033] 1, ultrasonic osteotome head; 100, first rod segment; 200, second rod segment; 300, third rod segment; 400, cutting portion; 410, cylindrical segment; 420, gear ring; 421, cutting tooth; 420a, first tooth-shaped gear ring; 420b, second tooth-shaped gear ring; 420c, third tooth-shaped gear ring; 500, first transition segment; 600, second transition segment; 700, head end; 800, tail end; 900, stepped hole; 910, large-diameter hole segment; 920, small-diameter hole segment; 1000, inclined slot; 1001, starting end; 1002, ending end; 1100, threaded hole. DETAILED DESCRIPTION

[0034] In order to make the technical problems to be solved, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0035] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0036] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0037] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0038] The ultrasonic bone cutter is a surgical tool that uses high-frequency ultrasonic oscillation to achieve cutting and grinding of bone tissue. Its working principle is to convert electrical energy into mechanical energy through the high-frequency vibration of the transducer and the ultrasonic bone cutter head to break the water and protein hydrogen bonds in the bone tissue cells, thereby achieving the cutting effect.

[0039] The ultrasonic bone cutter head is an important component of the ultrasonic bone cutter. The weight of the ultrasonic bone cutter head in the prior art is relatively large, resulting in a large loss of ultrasonic energy and affecting the cutting efficiency.

[0040] In addition, in order to achieve heat dissipation of the ultrasonic bone cutter head, the inventors of the present application provide a central hole that penetrates in the axial direction in the ultrasonic bone cutter head, and a cooling fluid is transported through the central hole to achieve heat dissipation of the ultrasonic bone cutter head. Although the central hole can reduce the weight of the ultrasonic bone cutter head to a certain extent, the weight of the ultrasonic bone cutter head is still relatively large, and the ultrasonic energy is still lost to a certain extent.

[0041] To solve the above problems, the present application provides an ultrasonic bone cutter head 1 and an ultrasonic bone cutter system. By providing a stepped hole 900 that penetrates in the axial direction in the ultrasonic bone cutter head 1, the hole diameter of the small-diameter hole section 920 can be designed to ensure the cutting stiffness of the cutting part 400, and the inner diameter of the large-diameter hole section 910 can be set to be larger than that of the small-diameter hole section 920, thereby further reducing the mass of the cutter shaft part and the weight of the entire ultrasonic bone cutter head 1, reducing the ultrasonic energy loss of the ultrasonic bone cutter head 1, and improving the cutting efficiency of the ultrasonic bone cutter system.

[0042] Please refer to Figure 1 and Figure 2 , the ultrasonic bone cutter head 1 provided by the present application will be described in detail.

[0043] The ultrasonic bone cutter head 1 includes a cutter shaft part, a cutting part 400, and a stepped hole 900 extending through the cutter shaft part and the cutting part 400. The stepped hole 900 includes a large-diameter hole section 910 and a small-diameter hole section 920. The small-diameter hole section 920 extends from the end face of the cutting part 400 away from the cutter shaft part to the large-diameter hole section 910. The large-diameter hole section 910 extends from the end face of the cutter shaft part away from the cutting part 400 to the small-diameter hole section 920. The minimum hole diameter of the large-diameter hole section 910 is greater than the maximum hole diameter of the small-diameter hole section 920.

[0044] Among them, the ultrasonic bone cutter head 1 is approximately a rotary body structure, the axial direction of the ultrasonic bone cutter head 1 is a straight line direction parallel to the center line of rotation of the ultrasonic bone cutter head 1, specifically as Figure 2 indicated by the arrow, it can also be the length extension direction of the ultrasonic bone cutter head 1 and the longitudinal direction of the ultrasonic bone cutter.

[0045] The ultrasonic bone cutter head 1 has a head end 700 and a tail end 800 arranged oppositely along the axial direction of the ultrasonic bone cutter head 1. The head end 700 of the ultrasonic bone cutter head 1 refers to an end of the ultrasonic bone cutter head 1 for cutting human tissues, that is, an end having the cutting portion 400. The tail end 800 of the ultrasonic bone cutter head 1 refers to an end of the ultrasonic bone cutter head 1 for forming a connection with a transducer. Meanwhile, in order to improve the cutting efficiency of the ultrasonic bone cutter head 1, the outer diameter of the ultrasonic bone cutter head 1 is generally designed to decrease from the tail end 800 to the head end 700, so as to increase the amplitude ratio of the ultrasonic bone cutter head 1 and improve the cutting efficiency.

[0046] The ultrasonic bone cutter head 1 provided by the embodiment of the present application has the stepped hole 900 designed in the ultrasonic bone cutter head 1. The small-diameter hole segment 920 extends from the end face of the cutter shank portion away from the cutting portion 400 to the large-diameter hole segment 910, and the large-diameter hole segment 910 extends from the end face of the cutter shank portion away from the cutting portion 400 to the small-diameter hole segment 920. That is, the hole diameter of the large-diameter hole segment 910 corresponding to the cutter shank portion is greater than the hole diameter of the small-diameter hole segment 920 corresponding to the cutting portion 400. In this way, the hole diameter of the small-diameter hole segment 920 can be designed to ensure the cutting stiffness of the cutting portion 400, and the inner diameter of the large-diameter hole segment 910 can be set to be greater than that of the small-diameter hole segment 920, so as to further reduce the mass of the cutter shank portion, thereby reducing the weight of the entire ultrasonic bone cutter head 1, reducing the ultrasonic energy loss of the ultrasonic bone cutter head 1, and improving the cutting efficiency of the ultrasonic bone system.

[0047] In some embodiments, referring to Figure 2 the center line of the small-diameter hole segment 920, the center line of the large-diameter hole segment 910, and the center line of the ultrasonic bone cutter head 1 coincide. The above arrangement makes the weight of the ultrasonic bone cutter head 1 evenly distributed or tend to be evenly distributed along the circumferential direction even if there is a stepped hole 900 inside the ultrasonic bone cutter head 1, so as to ensure the vibration uniformity and cutting uniformity of the ultrasonic bone cutter head 1, and in addition, the stepped hole 900 is easy to process.

[0048] In some embodiments, referring to Figure 2 the large-diameter hole segment 910 is a cylindrical hole, that is, the inner diameter of the large-diameter hole segment 910 is evenly distributed along the axial direction. Such an arrangement makes the processing of the large-diameter hole segment 910 simple. It can be understood that in other embodiments of the present application, the above large-diameter hole segment 910 can also be a gradually changing inner diameter hole, for example, the inner diameter of the large-diameter hole segment 910 gradually increases from one end connected to the small-diameter hole segment 920 to the other end.

[0049] In some embodiments, referring to Figure 2The small-diameter hole section 920 is a cylindrical hole, that is, the inner diameter of the small-diameter hole section 920 is uniformly distributed along the axial direction. In this way, the processing of the small-diameter hole section 920 is simple. It can be understood that, in other embodiments of the present application, the small-diameter hole section 920 can also be a hole with a gradually changing inner diameter, for example, the inner diameter of the small-diameter hole section 920 gradually decreases from one end connected to the large-diameter hole section 910 to the other end.

[0050] In some embodiments, referring to Figure 2 The hole diameter of the large-diameter hole section 910 is less than one half of the minimum outer diameter of the part of the ultrasonic bone cutter head 1 corresponding to the large-diameter hole section 910, and the hole diameter of the small-diameter hole section 920 is less than one half of the minimum outer diameter of the part of the ultrasonic bone cutter head 1 corresponding to the small-diameter hole section 920. That is, the inner diameter of the ultrasonic bone cutter head 1 at any position is set to be less than one half of the outer diameter at the corresponding position. In this way, the rigidity of the ultrasonic bone cutter head 1 can be ensured, and the requirement that the ultrasonic bone cutter head 1 generates a large grinding force when working with bone tissue through intense friction can be met.

[0051] In some embodiments, referring to Figure 1 and Figure 2 The shank part includes a first shank section 100, a second shank section 200, and a third shank section 300 arranged in sequence along the axial direction. The outer diameters of the first shank section 100, the second shank section 200, and the third shank section 300 decrease in sequence. The first shank section 100 and the second shank section 200 are connected by a first transition section 500, the second shank section 200 and the third shank section 300 are connected by a second transition section 600, and the third shank section 300 is connected to a cutting part 400 at an end away from the second shank section 200. The stepped hole 900 sequentially penetrates the first shank section 100, the first transition section 500, the second shank section 200, the second transition section 600, the third shank section 300, and the cutting part 400.

[0052] The first shank section 100, the second shank section 200, and the third shank section 300 have outer diameters that decrease in sequence along the axial direction. In this way, the ultrasonic bone cutter head 1 has a large amplitude ratio between the head end 700 and the tail end 800, thereby increasing the cutting speed. Meanwhile, the first transition section 500 is arranged between the first shank section 100 and the second shank section 200, and the second transition section 600 is arranged between the second shank section 200 and the third shank section 300. In this way, the outer diameter of the ultrasonic bone cutter head 1 gradually changes from the first shank section 100 to the second shank section 200, and gradually changes from the second shank section 200 to the third shank section 300, thereby reducing the concentrated stress at the connection and reducing the processing difficulty.

[0053] Specifically, the first shank section 100 and the second shank section 200 are both cylindrical sections 410, and the third shank section 300 is a conical section. The outer diameter of the third shank section 300 gradually decreases from the second transition section 600 to the head end 700.

[0054] Specifically, the outer circumferential surface of the first transition section 500 and the second transition section 600 can be a gradual curved surface or a gradual circular arc surface.

[0055] In the present application, the small-diameter hole section 920 is arranged at a position where the outer diameter of the ultrasonic bone cutter head 1 is relatively small, and the large-diameter hole section 910 is arranged at a position where the outer diameter of the ultrasonic bone cutter head 1 is relatively large, so as to reduce the weight of the large section while meeting the rigidity of the small end. However, the specific length of the small-diameter hole section 920 and the specific length of the large-diameter hole section 910 can not be limited, that is, the joint position of the small-diameter hole section 920 and the large-diameter hole section 910 can not be strictly limited, as long as the small-diameter hole section 920 corresponds to a position where the outer diameter is relatively small, and the large-diameter hole section 910 corresponds to a position where the outer diameter is relatively large.

[0056] As an example, please refer to Figure 2 The small-diameter hole section 920 and the large-diameter hole section 910 are connected at the position of the third rod section 300 close to the second transition section 600. That is, the small-diameter hole section 920 extends from the head end 700 end face to the position of the third rod section 300 close to the second transition section 600, and the large-diameter hole section 910 extends from the tail end 800 end face through the first rod section 100, the first transition section 500, the second rod section 200, the second transition section 600, and the third rod section 300 to the joint position of the small-diameter hole section 920. In this example, by extending the large-diameter hole section 910 to the third rod section 300, the weight of the ultrasonic bone cutter head 1 can be further reduced, and the ultrasonic energy consumption can be reduced.

[0057] As another example, the small-diameter hole section 920 and the large-diameter hole section 910 are connected at the second transition section 600. Specifically, the small-diameter hole section 920 and the large-diameter hole section 910 can be connected at the connection between the second transition section 600 and the third rod section 300, can be connected in the second transition section 600, or can be connected at the connection between the second transition section 600 and the second rod section 200. That is, the small-diameter hole section 920 can pass through the third rod section 300, and the large-diameter hole section 910 can pass through the first rod section 100 and the second rod section 200. By arranging in this way, the weight of the first rod section 100 and the second rod section 200 can be reduced as much as possible while ensuring the rigidity of the third rod section 300.

[0058] As another example, the small-diameter hole section 920 is connected with the large-diameter hole section 910 at a position of the second rod section 200 close to the second transition section 600. That is, the small-diameter hole section 920 extends from the head end 700 end face through the third rod section 300 and the second transition section 600 to the position of the second rod section 200 close to the second transition section 600, and the large-diameter hole section 910 extends from the tail end 800 end face through the first rod section 100 and the first transition section 500 to the position of the second rod section 200 close to the second transition section 600. In this example, by extending the small-diameter hole section 920 to the second rod section 200, the stiffness of the third rod section 300 is further improved, and the cutting force of the ultrasonic bone cutter head 1 is ensured.

[0059] For the ultrasonic bone cutter head 1, the amplitude of the head end 700 is a core index. Assuming that the input amplitude of the tail end 800 is A in , the output amplitude of the head end 700 is A out , the relationship between the output amplitude and the input amplitude can be simplified as:

[0060]

[0061] Wherein, the outer diameter of the tail end 800 is D1, the inner diameter of the large-diameter hole section 910 is D 1h , the outer diameter of the head end 700 is D2, and the inner diameter of the small-diameter hole section 920 is D 2h . It can be seen from the above relationship that, when other parameters are unchanged, the smaller the outer diameter D2 of the head end 700 is, the greater the amplitude can be obtained. At the same time, in order to meet the structural stiffness of the head end 700 and the third rod section 300, the outer diameter D2 of the head end 700 cannot be too small. After comprehensive consideration, the outer diameter D2 of the head end 700 is set to be the minimum 2.5 mm, for example, it can be 2.5 mm, 2.51 mm, 2.52 mm, 2.53 mm, 2.54 mm, 2.55 mm and above. When the outer diameter D2 of the head end 700 is set, the inner diameter D 2h of the small-diameter hole section 920 needs to be less than 1 / 2D2, that is, the inner diameter D 2h of the small-diameter hole section 920 needs to be less than 1.25 mm, for example, it can be 0-1.25 mm. In addition, considering the function of the small-diameter hole section 920 in transferring and dissipating heat of the fluid and considering the processing difficulty and stability of the small-diameter hole section 920, the inner diameter range of the small-diameter hole section 920 is set to 0.8 mm-1.25 mm in the embodiment, for example, the inner diameter of the small-diameter hole section 920 can be 0.8 mm, 0.85 mm, 0.9 mm, 0.95 mm, 1.0 mm, 1.05 mm, 1.1 mm, 1.15 mm, 1.2 mm or 1.25 mm. The above setting makes the small-diameter hole section 920 meet the stiffness of the third rod section 300 and also meet the fluid transmission and processing requirements.

[0062] Preferably, the inner diameter D2h 1.2mm, so that the fluid transmission requirements and processing requirements of the small-diameter hole section 920 can be met while satisfying the structural rigidity of the third rod section 300, and the inner diameter of the small-diameter hole section 920 is as large as possible, so that the inner diameter of the small-diameter hole section 920 and the inner diameter of the large-diameter hole section 910 do not differ too much.

[0063] In addition, corresponding to the tail end 800, in order to realize the connection of the tail end 800 and the transducer, and at the same time to ensure the structural rigidity of the ultrasonic bone knife head 1, the outer diameter D1 of the tail end 800 can be set to about 8mm, for example, can be 7.8mm, 7.9mm, 8mm, 8.1mm or 8.2mm, etc. Similarly, the inner diameter D 1h Need to be less than 1 / 2 of the outer diameter D1 of the tail end 800, then the inner diameter D 1h Can be 0-4mm. At the same time, since the second rod section 200 has a 1mm deep inclined groove 1000 (which will be described in detail later), that is, the inner wall of the second rod section 200 needs to be greater than 2mm, and the outer diameter of the second rod section 200 is generally set to 5.8mm, in order to satisfy the inner diameter D 1h Need to be less than 1 / 2 of the diameter of the second rod section 200, then the inner diameter D 1h Can be 0-1.9mm.

[0064] The present application replaces the parameter of the inner diameter D 2h 1.2mm of the small-diameter hole section 920 into the above relationship, the inner diameter D 1h When the inner diameter D 1h Should take a larger value in the range of 0-1.9mm, and in this embodiment, the inner diameter D 1h Of the large-diameter hole section 910 is set to 1.3mm-1.9mm, for example, the inner diameter D 1h Of the large-diameter hole section 910 can be 1.3mm, 1.35mm, 1.4mm, 1.45mm, 1.5mm, 1.55mm, 1.6mm, 1.65mm, 1.7mm, 1.75mm, 1.8mm, 1.85mm or 1.9mm, etc.

[0065] In some embodiments, considering the processing error, the inner diameter D 1h Of the large-diameter hole section 910 can be set to 1.7mm. The inner diameter D 1hWhen the inner diameter D of the large-diameter hole section 910 is greater than 1.7 mm, the side wall of the ultrasonic bone cutting head is too thin when twisted, and plastic deformation is prone to occur; when the inner diameter D of the large-diameter hole section 910 is less than 1.7 mm, the mass of the ultrasonic bone cutting head is relatively large, and the loss of internal energy delivered by the ultrasonic transducer is also increased accordingly. 1h When the inner diameter D of the large-diameter hole section 910 is less than 1.7 mm, the mass of the ultrasonic bone cutting head is relatively large, and the loss of internal energy delivered by the ultrasonic transducer is also increased accordingly. 1h When the inner diameter D of the large-diameter hole section 910 is less than 1.7 mm, the processing difficulty is relatively large.

[0066] In some embodiments, referring to Figure 1 The surface of the second rod section 200 is formed with a plurality of inclined grooves 1000 uniformly distributed in the circumferential direction.

[0067] Specifically, the inclined grooves 1000 extend in the first direction, which has an axial component of the ultrasonic bone cutting head 1 and a circumferential component of the ultrasonic bone cutting head 1. In this way, the axial vibration of the ultrasonic bone cutting head 1 can be converted into circumferential vibration, thereby realizing the transverse twisting motion required for cutting and grinding human tissue.

[0068] The inclined grooves 1000 are formed on the surface of the second rod section 200, the depth of the inclined grooves 1000 is less than the thickness of the side wall of the second rod section 200, and the inclined grooves 1000 are not in communication with the stepped hole 900. In addition, the number of inclined grooves 1000 is a plurality, and each inclined groove 1000 is uniformly distributed in the circumferential direction of the second rod section 200, so that the vibration in the circumferential direction is uniformly distributed.

[0069] In some embodiments, the starting end 1001 of the inclined groove 1000 is located at the connection between the first transition section 500 and the second rod section 200. The outer diameter of the first transition section 500 gradually decreases from the first rod section 100 to the second rod section 200, that is, the amplitude of the first transition section 500 gradually increases from small to large. By setting the starting end 1001 of the inclined groove 1000 at the end position of the first transition section 500, the loss of internal energy of vibration can be reduced. It can be understood that in other embodiments of the present application, the starting end 1001 of the inclined groove 1000 can also be located in the second rod section 200, which is not uniquely limited here.

[0070] In some embodiments, the ending end 1002 of the inclined groove 1000 is located at the connection between the second rod section 200 and the second transition section 600. The circumferential vibration direction changes at the connection between the second rod section 200 and the second transition section 600, which is the end point of vibration conversion, and can improve the conversion efficiency of the twisting amplitude. In addition, the connection position of the large-diameter hole section 910 and the small-diameter hole section 920 can also be set at this position. It can be understood that in other embodiments of the present application, the ending end 1002 of the inclined groove 1000 can also be located in the second rod section 200.

[0071] As an example, when the second rod segment 200 is short, the start end 1001 of the chute 1000 can be located at the connection between the first transition segment 500 and the second rod segment 200, and the end end 1002 of the chute 1000 can be located at the connection between the second rod segment 200 and the second transition segment 600.

[0072] As another example, when the second rod segment 200 is long, the start end 1001 of the chute 1000 can be located at the second rod segment 200, and the end end 1002 of the chute 1000 can be located at the connection between the second rod segment 200 and the second transition segment 600.

[0073] As another example, when the second rod segment 200 is long, the start end 1001 of the chute 1000 can be located at the second rod segment 200, and the end end 1002 of the chute 1000 can be located at the connection between the second rod segment 200 and the second transition segment 600.

[0074] In some embodiments, referring to Figure 2 , the chute 1000 is axially deflected by 14 degrees relative to the second rod segment 200, and the length of the chute 1000 is 11 mm. In other embodiments, the deflection angle of the chute 1000 can also be 10 degrees, 11 degrees, 12 degrees, 13 degrees, 14 degrees, 15 degrees, 16 degrees, 17 degrees, or 18 degrees, etc. according to the vibration conversion requirements. The length of the chute 1000 can also be 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, or 15 mm, etc.

[0075] In some embodiments, referring to Figure 2 and Figure 3 , the cutting part 400 includes a cylindrical segment 410 connected with the cutter rod part (specifically, the third rod segment 300) and a plurality of gear rings 420 arranged on the surface of the cylindrical segment 410 and spaced along the axial direction of the cylindrical segment 410, each gear ring 420 including a plurality of cutting teeth 421 spaced along the circumferential direction of the cylindrical segment 410. Among them, the plurality of gear rings 420 distributed along the axial direction of the cylindrical segment 410 can make the cutting part 400 have a certain cutting range along the axial direction of the cylindrical segment 410, and the cutting efficiency is high; at the same time, each gear ring 420 includes a plurality of cutting teeth 421 spaced along the circumferential direction, so that the cutting action of the cutting part 400 is uniformly distributed along the circumferential direction, and the cutting effect is uniformly distributed along the circumferential direction.

[0076] In some embodiments, referring to Figure 3 , the axial spacing of the cutting teeth 421 of adjacent gear rings 420 is greater than 2 times the amplitude of the cutting part 400. Specifically, among the two adjacent gear rings 420 along the axial direction, the axial center distance D of the two adjacent cutting teeth 421 along the axial direction is greater than 2 times the amplitude of the cutting part 400.

[0077] In this embodiment, the spacing of the cutting teeth 421 of the adjacent tooth ring 420 in the axial direction is greater than 2 times the amplitude of the cutting portion 400, so as to prevent the cutting teeth 421 from being stuck during the vibration of the cutting portion 400, and the cutting portion 400 cannot vibrate.

[0078] As an example, the amplitude of the cutting portion 400 is at least 300um, and the spacing of the cutting teeth 421 of the adjacent tooth ring 420 is greater than 600um, for example, 0.65mm, 0.7mm, 0.75mm or 0.8mm, etc.

[0079] In some embodiments, referring to Figure 3 , the cutting teeth 421 of the adjacent tooth ring 420 are arranged in a staggered manner along the circumference of the cylindrical segment 410. The staggered distribution of the cutting teeth 421, in combination with the 300um amplitude of the cutting portion 400, enables the ultrasonic bone cutter head 1 to cover a larger polishing area and enhance the polishing effect when performing longitudinal and torsional composite rotary motion.

[0080] In some embodiments of the present application, referring to Figure 4 , the cutting teeth 421 of the adjacent tooth ring 420 are arranged in alignment along the circumference of the cylindrical segment 410, which is simple in structure and easy to process.

[0081] In some embodiments, the plurality of tooth rings 420 includes at least three tooth rings with different tooth shapes. By arranging tooth rings with different tooth shapes, the purposes of positioning drilling, hole expansion and grinding can be achieved, and the final cutting effect can be achieved.

[0082] In some embodiments, referring to Figure 3 and Figure 4 , the tooth ring 420 includes a first tooth shape tooth ring 420a, a second tooth shape tooth ring 420b and a third tooth shape tooth ring 420c. The first tooth shape tooth ring 420a is arranged on the circumferential side surface of the cylindrical segment 410 and is adjacent to the end surface of the distal end of the cylindrical segment 410. The second tooth shape tooth ring 420b includes a plurality of second tooth shape tooth rings 420b, which are arranged on the circumferential side surface of the cylindrical segment 410 and are spaced apart along the axial direction of the cylindrical segment 410. The third tooth shape tooth ring 420c is arranged on the circumferential side surface of the cylindrical segment 410 and is located between the first tooth shape tooth ring 420a and the second tooth shape tooth ring 420b.

[0083] The first tooth-shaped gear ring 420a is arranged on the circumferential side of the cylindrical segment 410 and is adjacent to the end face of the distal end of the cylindrical segment 410, and is mainly used to realize the positioning drilling of the ultrasonic bone knife head 1 on the bone tissue and guide the ultrasonic bone knife head 1 to forward tapering. The third tooth-shaped gear ring 420c is located on the circumferential side of the cylindrical segment 410 and is adjacent to the first tooth-shaped gear ring 420a, and the third tooth-shaped gear ring 420c is mainly used to further expand the drilling. The second tooth-shaped gear ring 420b is located on the circumferential side of the cylindrical segment 410 and is adjacent to the third tooth-shaped gear ring 420c, and the second tooth-shaped gear ring 420b is used to realize the further grinding modification of the hole wall.

[0084] In some embodiments, referring to Figure 3 and Figure 4 , the cutting tooth 421 is a quadrangular pyramid structure, the bottom surface of the quadrangular pyramid structure is integrally connected with the outer wall surface of the cylindrical segment 410, and is connected through a circular arc transition. Among them, the setting of the sharp end can improve the sharpness of the cutting tooth 421 and improve the cutting efficiency, and the design of the quadrangular pyramid structure can increase the number of cutting edges of the cutting tooth 421 and improve the cutting efficiency and cutting comprehensiveness.

[0085] Specifically, referring to Figure 3 and Figure 4 , the cutting tooth 421 in the first tooth-shaped gear ring 420a has a sharp end facing the distal end of the cylindrical segment 410, and the sharp end extends beyond the end face of the cylindrical segment 410, one of the included angles between the tooth surface of the cutting tooth 421 and the connecting surface of the cylindrical segment 410 is an obtuse angle, and the obtuse angle is the included angle between the tooth surface and the connecting surface of the cylindrical segment 410 close to the distal end of the cylindrical segment 410, that is, the cross section of the cutting tooth 421 along the axial direction of the cylindrical segment 410 is an obtuse triangle, so that the sharp end extending beyond the end face of the cylindrical segment 410 is beneficial to the forward tapering of the ultrasonic bone knife head 1.

[0086] Specifically, referring to Figure 3 and Figure 4 , the sharp end of the cutting tooth 421 in the third tooth-shaped gear ring 420c has a first distance relative to the center line of the cylindrical segment 410, which is greater than the second distance of the sharp end of the cutting tooth 421 in the first tooth-shaped gear ring 420a relative to the center line of the cylindrical segment 410, thereby realizing the hole expansion. Among them, one of the included angles between the tooth surface of the cutting tooth 421 in the third tooth-shaped gear ring 420c and the connecting surface of the cylindrical segment 410 is preferably a right angle, and the right angle is the included angle between the tooth surface and the connecting surface of the cylindrical segment 410 close to the distal end of the cylindrical segment 410, that is, the cross section of the cutting tooth along the axial direction of the cylindrical segment 410 is preferably a right triangle, so as to improve the stress intensity of the cutting tooth 421 along the axial direction of the cylindrical segment 410, facilitate the forward drilling, and improve the cutting ability of the head.

[0087] Specifically, referring to Figure 3 and Figure 4The cutting teeth 421 in the second tooth-shaped ring gear 420b are in the shape of acute-angled triangles, preferably isosceles triangles, which are advantageous for further grinding and finishing the hole wall formed by drilling.

[0088] In some embodiments, referring to Figure 2 The tail end 800 of the ultrasonic bone cutter head 1 is further provided with a threaded hole 1100 for connecting the transducer and the ultrasonic bone cutter head 1. Specifically, the threaded hole 1100 is coaxially connected with the large-diameter hole section 910, and the inner diameter of the threaded hole 1100 is larger than the inner diameter of the large-diameter hole section 910. During assembly, the connecting part of the transducer is inserted into the threaded hole 1100, thereby realizing the connection between the transducer and the ultrasonic bone cutter head 1. The provision of the threaded hole 1100 not only forms the connection between the ultrasonic bone cutter head 1 and the transducer, but also further reduces the weight of the ultrasonic bone cutter head 1, thereby reducing the loss of ultrasonic energy. The ultrasonic energy transmission direction of the transducer is parallel to the axial direction of the ultrasonic bone cutter head 1.

[0089] In some embodiments, the total length of the ultrasonic bone cutter head 1 is λ2, Where c is the speed of sound of the ultrasonic bone cutter head 1, and f is the resonance frequency of the ultrasonic bone cutter head 1. In this embodiment, λ is 210 mm, so that the transmission energy of the ultrasonic bone cutter head 1 is maximized. Of course, in other embodiments, the length of the ultrasonic bone cutter head 1 can also be set in other ways, which is not limited herein.

[0090] In some embodiments, referring to Figure 1 and Figure 2 The ultrasonic bone cutter head 1 is an integral connection structure, that is, the first rod section 100, the first transition section 500, the second rod section 200, the second transition section 600, the third rod section 300, and the cutting part 400 are integrally formed.

[0091] On the other hand, the present application also provides an ultrasonic bone cutter system, which comprises the above ultrasonic bone cutter head 1. In addition, the ultrasonic bone cutter can further comprise an ultrasonic main machine and a transducer, the transducer is connected with the tail end 800 of the ultrasonic bone cutter head 1, the ultrasonic main machine provides electric energy for the transducer, and the transducer is used for converting electric energy into mechanical vibration.

[0092] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An ultrasonic bone cutting blade head (1) characterized in that, The ultrasonic osteotome head (1) comprises a shank portion, a cutting portion (400), and a stepped hole (900) extending through the shank portion and the cutting portion (400), the stepped hole (900) comprises a large-diameter hole section (910) and a small-diameter hole section (920), the small-diameter hole section (920) extends from an end face of the cutting portion (400) away from the shank portion to the large-diameter hole section (910), the large-diameter hole section (910) extends from an end face of the shank portion away from the cutting portion (400) to the small-diameter hole section (920), the minimum hole diameter of the large-diameter hole section (910) is greater than the maximum hole diameter of the small-diameter hole section (920).

2. The ultrasonic bone cutter head (1) according to claim 1, characterized in that The hole diameter of the large-diameter hole section (910) is less than half of the minimum outer diameter of the ultrasonic osteotome head (1) corresponding to the large-diameter hole section (910) portion; The hole diameter of the small-diameter hole section (920) is less than half of the minimum outer diameter of the ultrasonic osteotome head (1) corresponding to the small-diameter hole section (920) portion.

3. The ultrasonic bone cutter head (1) according to claim 1 or 2, characterized in that The shank portion comprises a first shank section (100), a second shank section (200), and a third shank section (300) arranged in sequence along the axial direction, the outer diameters of the first shank section (100), the second shank section (200), and the third shank section (300) decrease in sequence, a first transition section (500) is connected between the first shank section (100) and the second shank section (200), a second transition section (600) is connected between the second shank section (200) and the third shank section (300), and a cutting portion (400) is connected to an end of the third shank section (300) away from the second shank section (200); the stepped hole (900) sequentially penetrates the first shank section (100), the first transition section (500), the second shank section (200), the second transition section (600), the third shank section (300), and the cutting portion (400).

4. The ultrasonic bone cutter head (1) according to claim 3, characterized in that The small-diameter hole section (920) and the large-diameter hole section (910) are connected at a position of the third shank section (300) close to the second transition section (600); Alternatively, the small-diameter hole section (920) and the large-diameter hole section (910) are connected at the second transition section (600); Alternatively, the small-diameter hole section (920) and the large-diameter hole section (910) are connected at a position of the second shank section (200) close to the second transition section (600).

5. The ultrasonic bone cutter head (1) according to claim 3, characterized in that The surface of the second shank section (200) is formed with a plurality of circumferentially uniformly spaced inclined grooves (1000).

6. The ultrasonic bone cutter tip (1) of claim 1, characterized in that The cutting portion (400) comprises a cylindrical section (410) connected to the shank portion and a plurality of gear rings (420) arranged on the surface of the cylindrical section (410) and spaced along the axial direction of the cylindrical section (410), each gear ring (420) comprises a plurality of cutting teeth (421) spaced along the circumferential direction of the cylindrical section (410), and the plurality of gear rings (420) comprise at least three kinds of gear rings.

7. The ultrasonic bone cutter head (1) according to claim 6, characterized in that The gear ring (420) comprises a first tooth profile gear ring (420a), a second tooth profile gear ring (420b) and a third tooth profile gear ring (420c), the first tooth profile gear ring (420a) is arranged on the circumferential side of the cylindrical segment (410) and is adjacent to the end face of the distal end of the cylindrical segment (410), the second tooth profile gear ring (420b) comprises a plurality of second tooth profile gear rings (420b), and the plurality of second tooth profile gear rings (420b) are arranged on the circumferential side of the cylindrical segment (410) and are arranged in an axial interval along the cylindrical segment (410); the third tooth profile gear ring (420c) is arranged on the circumferential side of the cylindrical segment (410) and is located between the first tooth profile gear ring (420a) and the second tooth profile gear ring (420b).

8. The ultrasonic bone cutter tip (1) of claim 6, characterized in that The spacing of the cutting teeth (421) of the adjacent gear rings (420) in the axial direction is greater than 2 times the amplitude of the cutting part (400).

9. The ultrasonic bone cutter tip (1) of claim 6, characterized in that The cutting teeth (421) of the adjacent gear rings (420) are arranged in a staggered manner in the circumferential direction of the cylindrical segment (410).

10. An ultrasonic osteotome system characterized by, An ultrasonic osteotome head (1) according to any one of claims 1 to 9, an ultrasonic host, a transducer connected to the ultrasonic osteotome head (1), and the ultrasonic host providing electric energy to the transducer, the transducer being used to convert the electric energy into mechanical vibration.

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