Ultrasonic bone cutter head and ultrasonic bone cutter system

Abstract

The application provides an ultrasonic bone knife head and an ultrasonic bone knife system. The ultrasonic bone knife system comprises an ultrasonic host, a transducer and the ultrasonic bone knife head. The ultrasonic bone knife head is used for working in a 25KHz-26KHz resonance frequency range, and the total length L0 of the ultrasonic bone knife head ranges from 289.5mm to 299.5mm. The ultrasonic bone knife head comprises a knife rod part and a cutting part. The knife rod part comprises a first rod segment, a second rod segment, a third rod segment and a fourth rod segment connected in sequence along the axial direction of the knife rod part. The cutting part is connected with the fourth rod segment. The diameters of the first rod segment, the second rod segment, the third rod segment, the fourth rod segment and the cutting part decrease in sequence. The application lengthens the design of the ultrasonic bone knife head, so that the ultrasonic bone knife head can reach deep or difficult-to-access anatomical regions, thereby enabling the ultrasonic bone knife head to be applied to complex surgeries such as minimally invasive surgeries, and the application range is wider.

Description

Technical Field

[0001] This application belongs to the field of medical device technology, and more specifically, relates to an ultrasonic bone scalpel tip and an ultrasonic bone scalpel system. Background Technology

[0002] The working principle of an ultrasonic bone scalpel is to convert electrical energy into mechanical energy through a piezoelectric converter, causing the ultrasonic bone scalpel tip to oscillate at a specific high frequency range. This vaporizes water and breaks protein hydrogen bonds within the contacted tissue cells, thereby completely destroying the bone tissue that needs to be removed. Simultaneously, the ultrasonic bone scalpel's unique operating frequency provides excellent soft and hard tissue differentiation capabilities, effectively reducing damage to surrounding soft tissues, blood vessels, and nerves. In orthopedic surgery, situations often arise requiring the cutting or sawing of necrotic bone tissue. The typical procedure involves mounting the ultrasonic bone scalpel on a piezoelectric converter, and the surgeon then controls the ultrasonic bone scalpel through surgical equipment to perform the cutting work at the patient's affected area.

[0003] The ultrasonic bone scalpel tip is a crucial component of the ultrasonic bone scalpel, and its design and function play a vital role in improving surgical precision, reliability, and safety. However, currently, ultrasonic bone scalpels are primarily used in open surgeries, which require relatively short tip lengths. With the continuous development of minimally invasive surgery, existing bone scalpel tips often cannot reach deep areas or are difficult to access anatomical regions in some minimally invasive orthopedic procedures, limiting their application in complex surgeries such as minimally invasive procedures. Summary of the Invention

[0004] The purpose of this application is to provide an ultrasonic bone scalpel tip and an ultrasonic bone scalpel system to solve the technical problem that the ultrasonic bone scalpel tip cannot reach deep or difficult-to-access anatomical areas in the prior art.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: An ultrasonic bone scalpel tip is provided, which operates within a resonant frequency range of 25kHz-26kHz, and the total length L0 of the ultrasonic bone scalpel tip ranges from 289.5mm to 299.5mm; the ultrasonic bone scalpel tip includes a shank portion and a cutting portion, the shank portion comprising a first segment, a second segment, a third segment, and a fourth segment connected sequentially along its axial direction, and the cutting portion being connected to the fourth segment; the diameters of the first segment, the second segment, the third segment, the fourth segment, and the cutting portion decrease sequentially.

[0006] In some embodiments, the outer peripheral surface of the second segment includes a second cut surface formed by partial cutting, and the outer peripheral surface of the third segment includes a third cut surface formed by partial cutting.

[0007] In some embodiments, the second segment includes two second cut surfaces symmetrically arranged relative to its central axis, and the third segment includes two third cut surfaces symmetrically arranged relative to its central axis; one of the second cut surfaces is parallel to one of the third cut surfaces, and the other second cut surface is parallel to the other third cut surface.

[0008] In some embodiments, the first distance from the second cut surface to the proximal end face of the tool holder is in the range of 75mm-77mm; the axial length of the second cut surface is in the range of 45mm-49mm; and the radial depth of the second cut surface is in the range of 3.05mm-3.15mm.

[0009] And / or, the second distance from the third cutting surface to the proximal end face of the tool holder ranges from 158mm to 162mm; the axial length of the third cutting surface ranges from 45mm to 47mm; and the radial depth of the third cutting surface ranges from 3.05mm to 3.15mm.

[0010] In some embodiments, the outer peripheral surface of the fourth segment includes two fourth tangential surfaces symmetrically arranged relative to its central axis; the cutting portion has two opposing first sidewalls and two opposing second sidewalls, and the two fourth tangential surfaces extend to the two first sidewalls respectively; cutting teeth are distributed on the two second sidewalls and the distal end face of the cutting portion.

[0011] In some embodiments, the distance between the two first sidewalls is a first thickness, the first thickness gradually decreases from the proximal end to the distal end in at least a partial section, and the minimum value of the first thickness ranges from 0.8 mm to 1.0 mm.

[0012] In some embodiments, the outer peripheral surface of the first rod segment includes two first sectional surfaces arranged symmetrically with respect to its central axis.

[0013] In some embodiments, the axial length of the first rod segment ranges from 30mm to 34mm, the axial length of the second rod segment ranges from 91.5mm to 107.5mm, the axial length of the third rod segment ranges from 88mm to 107mm, and the axial length of the fourth rod segment ranges from 50.5mm to 59mm.

[0014] And / or, the outer diameter of the first rod segment is in the range of 7.5mm-8.5mm, the outer diameter of the second rod segment is in the range of 4.0mm-4.4mm, the outer diameter of the third rod segment is in the range of 3.4mm-3.8mm, and the outer diameter of the fourth rod segment is in the range of 2.9mm-3.1mm.

[0015] In some embodiments, the proximal end of the second rod segment includes a first transition segment whose outer diameter gradually decreases from the proximal end to the distal end, and the radius of the arc of the first transition segment is in the range of 17mm-18mm.

[0016] And / or, the proximal end of the third rod segment includes a second transition segment whose outer diameter gradually decreases from the proximal end to the distal end, and the radius of the arc of the second transition segment is in the range of 6.5mm-15mm;

[0017] And / or, the proximal end of the fourth segment includes a third transition segment whose outer diameter gradually decreases from the proximal end to the distal end, and the radius of the arc of the third transition segment is in the range of 16mm-17mm.

[0018] On the other hand, this application also provides an ultrasonic bone scalpel system, including an ultrasonic host, a transducer, and the aforementioned ultrasonic bone scalpel head. The transducer is connected to the ultrasonic bone scalpel head, the ultrasonic host provides electrical energy to the transducer, and the transducer is used to convert the electrical energy into mechanical vibration.

[0019] The beneficial effects of the ultrasonic bone scalpel tip and ultrasonic bone scalpel system provided in this application are as follows: The total length L0 of the ultrasonic bone scalpel tip is set within the range of 289.5mm-299.5mm, thus meeting the need for lengthening the ultrasonic bone scalpel tip. This allows the ultrasonic bone scalpel tip to reach deep or difficult-to-access anatomical areas, enabling its application in complex surgeries such as minimally invasive surgery, thus broadening its application range. Simultaneously, when the resonant frequency f of the ultrasonic bone scalpel is in the range of 25kHz-26kHz, the total length L0 of the extended ultrasonic bone scalpel tip ranges from 289.5mm to 299.5mm. Furthermore, the scalpel shaft is designed with four segments connected sequentially along its axial direction, with the diameter decreasing sequentially. This ensures that the system composed of the ultrasonic bone scalpel tip and transducer achieves a stable resonant state at the operating frequency. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A three-dimensional structural schematic diagram of the ultrasonic bone scalpel head provided in the embodiments of this application;

[0022] Figure 2 A side view of the ultrasonic bone scalpel head provided in an embodiment of this application;

[0023] Figure 3A schematic diagram of the radial cross-section of the ultrasonic bone scalpel tip relative to the second rod segment, provided in an embodiment of this application;

[0024] Figure 4 A three-dimensional structural schematic diagram of the cutting portion in the ultrasonic bone scalpel head provided in an embodiment of this application;

[0025] Figure 5 This is a side view of the cutting section in the ultrasonic bone scalpel head provided in an embodiment of this application;

[0026] Figure 6 This is a schematic diagram illustrating the relationship between frequency and amplitude in the ultrasonic bone scalpel system provided in this application embodiment.

[0027] The following are the labeling elements in the figure:

[0028] 100, Blade shank; 110, First segment; 111, First cut surface; 120, Second segment; 121, Second cut surface; 122, First transition segment; 130, Third segment; 131, Third cut surface; 132, Second transition segment; 140, Fourth segment; 141, Fourth cut surface; 142, Third transition segment; 200, Cutting part; 210, First sidewall; 230, Cutting tooth; 231, Cutting surface; d1, First distance; d2, Second distance. Detailed Implementation

[0029] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0030] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0031] It should be understood that the terms "length", "width", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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 application.

[0032] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0033] For ease of description and understanding, the terms "distal" and "proximal" should be understood as referring to the view from the direction held by the attending physician or interventional physician. The distal end is the side furthest from the attending physician's or interventional physician's hand, while the proximal end refers to the side facing the attending physician's or interventional physician's hand. Axial direction refers to the direction parallel to the line connecting the distal and proximal centers of the medical device; radial direction refers to the direction perpendicular to the aforementioned axial direction.

[0034] As described in the background section, the ultrasonic bone scalpel tip is an important component of the ultrasonic bone scalpel, and its design and function play a crucial role in improving surgical precision, reliability, and safety. However, currently, ultrasonic bone scalpels are mainly used in open surgeries, which require a relatively short tip length. With the continuous development of minimally invasive surgery, existing bone scalpel tips cannot reach deep areas or are difficult to access anatomical regions in some minimally invasive or orthopedic surgeries, limiting their application in certain complex surgeries, including minimally invasive procedures.

[0035] To address the aforementioned issues, this application provides an ultrasonic bone scalpel tip and system. By lengthening the shank 100 of the ultrasonic bone scalpel tip, the requirement for a longer tip is met, enabling the tip to reach deep or difficult-to-access anatomical areas, thus allowing its application in minimally invasive surgery. However, the lengthened shank 100 can lead to instability in the overall resonant system during operation. Therefore, while meeting the requirement for a longer shank 100, the structure of the shank 100 also needs to be designed to ensure that the system comprised of the tip and transducer achieves a stable resonant state at the operating frequency during use. In this embodiment, the extended ultrasonic bone scalpel tip has a total length L0 ranging from 289.5mm to 299.5mm when the resonant frequency f of the ultrasonic bone scalpel is in the range of 25KHz-26KHz. At the same time, the scalpel shank 100 is designed with a first shank segment 110, a second shank segment 120, a third shank segment 130, and a fourth shank segment 140 connected sequentially along its axial direction with decreasing diameters. This allows the system composed of the ultrasonic bone scalpel tip and the transducer to reach a stable resonant state at the operating frequency.

[0036] Please see Figure 1 and Figure 2The ultrasonic bone scalpel head provided in the embodiments of this application will now be described. This ultrasonic bone scalpel head is used to operate in the resonant frequency range of 25kHz-26kHz, and the total length L0 of the ultrasonic bone scalpel head ranges from 289.5mm to 299.5mm. The ultrasonic bone scalpel head includes a shank portion 100 and a cutting portion 200. The shank portion 100 includes a first segment 110, a second segment 120, a third segment 130, and a fourth segment 140 connected sequentially along its axial direction. The cutting portion 200 is connected to the fourth segment 140. The diameters of the first segment 110, the second segment 120, the third segment 130, the fourth segment 140, and the cutting portion 200 decrease sequentially.

[0037] Specifically, the resonant frequency f of the ultrasonic bone scalpel can be 25 kHz, 25.1 kHz, 25.2 kHz, 25.3 kHz, 25.4 kHz, 25.5 kHz, 25.6 kHz, 25.7 kHz, 25.8 kHz, 25.9 kHz, or 26 kHz. The ultrasonic bone scalpel inherently possesses the characteristic of "cutting hard tissues but not soft tissues," and this characteristic is better manifested at frequencies between 25 kHz and 26 kHz. During orthopedic surgeries, even if the scalpel tip occasionally encounters nearby blood vessels or nerves, it will not cause damage, thus maximizing the protection of soft tissues and promoting the recovery of surrounding soft tissues. Furthermore, at this frequency, the cutting tip amplitude of the ultrasonic bone scalpel is small, at the micrometer level, resulting in higher cutting precision and effectively avoiding unnecessary bone damage. In addition, ultrasonic oscillation at 25 kHz-26 kHz creates cavitation, which limits blood leakage and facilitates the removal of bone fragments from the working area. During the surgery, the doctor can see the surgical area very clearly, minimizing damage to soft tissues such as mucous membranes, blood vessels, and nerves, which helps improve the safety and success rate of the surgery.

[0038] When the resonant frequency f of the ultrasonic bone scalpel is in the range of 25kHz-26kHz, the total length L0 of the ultrasonic bone scalpel tip is in the range of 289.5mm-299.5mm. Specifically, the total length L0 of the ultrasonic bone scalpel tip can be 289.5mm, 290.0mm, 290.5mm, 291.0mm, 291.5mm, 292.0mm, 292.5mm, 293.0mm, 293.5mm, 294.0mm, 294.5mm, 295.0mm, 295.5mm, 296.0mm, 296.5mm, 297.0mm, 297.5mm, 298.0mm, 298.5mm, 299.0mm, or 299.5mm. This setting allows for both high cutting precision and a sufficiently long tip to meet the cutting needs of various complex surgeries.

[0039] The ultrasonic bone scalpel tip provided in this embodiment satisfies the need for lengthening the ultrasonic bone scalpel tip by setting its total length L0 to the range of 289.5mm-299.5mm. This allows the ultrasonic bone scalpel tip to reach deep or difficult-to-access anatomical areas, thus enabling its application in complex surgeries such as minimally invasive surgery, broadening its application range. Furthermore, when the resonant frequency f of the ultrasonic bone scalpel is in the range of 25kHz-26kHz, the total length L0 of the extended ultrasonic bone scalpel tip ranges from 289.5mm to 299.5mm. The scalpel shaft 100 is designed with four segments—a first segment 110, a second segment 120, a third segment 130, and a fourth segment 140—connected sequentially along its axial direction with progressively decreasing diameters. This ensures that the system composed of the ultrasonic bone scalpel tip and the transducer achieves a stable resonant state at the operating frequency.

[0040] In some embodiments, the total length is L0, L0 = 3λ², λ = c / f, where λ is the ultrasonic wavelength of the ultrasonic scalpel tip, c is the sound velocity of the ultrasonic waves in the ultrasonic scalpel, and f is the resonant frequency of the ultrasonic scalpel. This embodiment sets the total length of the ultrasonic scalpel tip to an integer multiple of λ², allowing the use of the ultrasonic resonance characteristics to improve the amplitude amplification ratio of the ultrasonic transducer and the mechanical impact force of the tip, thereby optimizing the cutting effect and energy conversion efficiency during surgery. Simultaneously, it ensures that the total length of the ultrasonic scalpel tip is sufficiently long to reach deep within the body, adapting to various complex surgeries, such as minimally invasive surgery, thus broadening its application range.

[0041] In some embodiments, the axial length of the first segment 110 ranges from 30mm to 34mm, the axial length of the second segment 120 ranges from 91.5mm to 107.5mm, the axial length of the third segment 130 ranges from 88mm to 107mm, and the axial length of the fourth segment 140 ranges from 50.5mm to 59mm. With the resonant frequency f of the ultrasonic bone scalpel ranging from 25kHz to 26kHz, by appropriately adjusting the lengths of the first segment 110, the second segment 120, the third segment 130, and the fourth segment 140, the total length of the ultrasonic bone scalpel tip is kept within the range of 289.5mm to 299.5mm. This ensures that the frequency and amplitude of the ultrasonic bone scalpel have only one peak, resulting in a higher energy conversion rate and better cutting effect.

[0042] Optionally, the axial length of the first segment 110 can be 30mm, 30.5mm, 31mm, 31.5mm, 32mm, 32.5mm, 33mm, 33.5mm, or 34mm, etc. The axial length of the second segment 120 can be 91.5mm, 92.5mm, 93.5mm, 94.5mm, 95.5mm, 96.5mm, 97.5mm, 98.5mm, 99.5mm, 100.5mm, 101.5mm, 102.5mm, 103.5mm, 104.5mm, 105.5mm, 106.5mm, or 107.5mm, etc. The axial length of the third segment 130 can be 88mm, 90mm, 92mm, 94mm, 96mm, 98mm, 100mm, 102mm, 104mm, 106mm or 107mm, etc., and the axial length of the fourth segment 140 can be 50.5mm, 51mm, 52mm, 53mm, 54mm, 55mm, 56mm, 57mm, 58mm or 59mm, etc.

[0043] In some embodiments, the outer diameter range of the first segment 110 is 7.5mm-8.5mm, the outer diameter range of the second segment 120 is 4.0mm-4.4mm, the outer diameter range of the third segment 130 is 3.4mm-3.8mm, and the outer diameter range of the fourth segment 140 is 2.9mm-3.1mm. In this application, since the total length of the ultrasonic bone scalpel tip is significantly longer than that of the existing standard ultrasonic bone scalpel tip, in order to ensure the structural strength of the extended ultrasonic bone scalpel tip, this embodiment limits the outer diameter range of the first segment 110, the second segment 120, the third segment 130, and the fourth segment 140. While ensuring that the outer diameter of the fourth segment 140 is sufficiently large, the outer diameters of each segment can be decreased sequentially.

[0044] Optionally, the outer diameter of the first segment 110 can be 7.5mm, 7.6mm, 7.7mm, 7.8mm, 7.9mm, 8.0mm, 8.1mm, 8.2mm, 8.3mm, 8.4mm, or 8.5mm; the outer diameter of the second segment 120 can be 4.0mm, 4.1mm, 4.2mm, 4.3mm, or 4.4mm; the outer diameter of the third segment 130 can be 3.4mm, 3.5mm, 3.6mm, 3.7mm, or 3.8mm; and the outer diameter of the fourth segment 140 can be 2.9mm, 2.95mm, 3.0mm, 3.05mm, or 3.1mm.

[0045] In some embodiments, please refer to Figure 1The proximal end of the second segment 120 includes a first transition segment 122 whose outer diameter gradually decreases from proximal to distal; and / or, the proximal end of the third segment 130 includes a second transition segment 132 whose outer diameter gradually decreases from proximal to distal; and / or, the proximal end of the fourth segment 140 includes a third transition segment 142 whose outer diameter gradually decreases from proximal to distal. The arrangement of the first transition segment 122, the second transition segment 132, and the third transition segment 142 ensures a smooth transition at the connection points of the first segment 110, the second segment 120, the third segment 130, and the fourth segment 140, thus ensuring the overall strength and stability of the ultrasonic bone scalpel head.

[0046] Optionally, the radius of the arc of the first transition segment 122 is in the range of 17mm-18mm. For example, the radius of the arc of the first transition segment 122 can be 17mm, 17.1mm, 17.2mm, 17.3mm, 17.4mm, 17.5mm, 17.6mm, 17.7mm, 17.8mm, 17.9mm, or 18mm. By limiting the radius of the arc of the first transition segment 122, a smooth transition between the first segment 110 and the second segment 120 is achieved.

[0047] Optionally, the radius of the arc of the second transition segment 132 is in the range of 6.5mm-15mm. For example, the radius of the arc of the second transition segment 132 can be 6.5mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm or 15mm. By limiting the radius of the arc of the second transition segment 132, the second segment 120 and the third segment 130 can be smoothly transitioned.

[0048] Optionally, the radius of the arc of the third transition segment 142 is in the range of 16mm-17mm. For example, the radius of the arc of the third transition segment 142 can be 16mm, 16.1mm, 16.2mm, 16.3mm, 16.4mm, 16.5mm, 16.6mm, 16.7mm, 16.8mm, 16.9mm, or 17mm. By limiting the radius of the arc of the third transition segment 142, a smooth transition between the third segment 130 and the fourth segment 140 is achieved.

[0049] In some embodiments, please refer to Figure 1 and Figure 2 The outer peripheral surface of the second segment 120 includes a second cut surface 121 formed by local cutting, and the outer peripheral surface of the third segment 130 includes a third cut surface 131 formed by local cutting.

[0050] It should be noted that both the second segment 120 and the third segment 130 are generally cylindrical. A second cut surface 121 is formed by locally cutting the outer surface of the second segment 120, and a third cut surface 131 is formed by locally cutting the outer surface of the third segment 130. The formation of the second and third cut surfaces 121 allows for adjustment of the overall structural distribution of the ultrasonic bone scalpel head, preventing the elongated cylindrical structure of the scalpel shaft 100 from generating other modal vibrations during vibration, thus optimizing the cutting performance of the ultrasonic bone scalpel head.

[0051] In some embodiments, the second segment 120 includes two second cut surfaces 121 arranged symmetrically with respect to its central axis, and the third segment 130 includes two third cut surfaces 131 arranged symmetrically with respect to its central axis.

[0052] The above configuration improves the structural performance of the ultrasonic bone scalpel tip and better prevents the generation of other modal vibrations during vibration. Understandably, in other embodiments of this application, the number of second cut surfaces 121 may also be three or more, with each second cut surface 121 sequentially distributed along the circumference of the second rod segment 120. The structural performance of the ultrasonic bone scalpel tip can be improved by adjusting the position, axial length, and radial depth of each second cut surface 121. Similarly, the number of third cut surfaces 131 may also be three or more, with each third cut surface 131 sequentially distributed along the circumference of the third rod segment 130. The structural performance of the ultrasonic bone scalpel tip can be improved by adjusting the position, axial length, and radial depth of each third cut surface 131.

[0053] In some embodiments, please refer to Figure 2 Both the second cut surface 121 and the third cut surface 131 are planar. The second cut surface 121 is perpendicular to the radial section of the blade holder 100, and the third cut surface 131 is also perpendicular to the radial section of the blade holder 100. One of the second cut surfaces 121 is parallel to one of the third cut surfaces 131, and the other second cut surface 121 is parallel to the other third cut surface 131. This arrangement makes the surface of the blade holder 100 smooth and neat, reducing damage to human tissue.

[0054] In some embodiments, please refer to Figure 2 The first distance d1 from the second cutting surface 121 to the proximal end face of the tool holder 100 ranges from 75mm to 77mm; the axial length of the second cutting surface 121 ranges from 45mm to 49mm; and the radial depth of the second cutting surface 121 ranges from 3.05mm to 3.15mm.

[0055] It should be noted that the first distance d1 refers to the distance from the end of the second cutting surface 121 near the proximal end of the tool holder 100 to the proximal end face of the tool holder 100, such as... Figure 2As shown. The radial depth of the second cut surface 121 refers to the first depth H1 cut inward from the outer cylindrical surface of the second rod segment 120 relative to the second cut surface 121, as shown. Figure 3 As shown.

[0056] Specifically, the first distance d1 from the second cutting surface 121 to the proximal end face of the tool holder portion 100 is 75mm, 75.4mm, 75.8mm, 76.2mm, 76.6mm, or 77mm; the axial length of the second cutting surface 121 is 45mm, 46mm, 47mm, 48mm, or 49mm; and the radial depth of the second cutting surface 121 is 3.05mm, 3.06mm, 3.07mm, 3.08mm, 3.09mm, 3.10mm, 3.11mm, 3.12mm, 3.13mm, 3.14mm, or 3.15mm.

[0057] In this embodiment, by limiting the position, axial length and radial depth of the second cut surface 121, the performance adjustment effect of the second cut surface 121 on the entire ultrasonic bone scalpel head is maximized, thereby ensuring the cutting performance of the ultrasonic bone scalpel head.

[0058] In some embodiments, the second distance d2 from the third cutting surface 131 to the proximal end face of the tool holder portion 100 ranges from 158mm to 162mm; the axial length of the third cutting surface 131 ranges from 45mm to 47mm; and the radial depth of the third cutting surface 131 ranges from 3.05mm to 3.15mm.

[0059] It should be noted that the second distance d2 refers to the distance from the end of the third cutting surface 131 near the proximal end of the tool holder 100 to the proximal end face of the tool holder 100, such as... Figure 2 As shown. The radial depth of the third cut surface 131 is set to the second depth by which the third cut surface 131 is cut inward relative to the outer cylindrical surface of the third rod segment 130.

[0060] Specifically, the second distance d2 from the third cutting surface 131 to the proximal end face of the tool holder 100 is 158mm, 159mm, 160mm, 161mm or 162mm; the axial length of the third cutting surface 131 is 45mm, 45.5mm, 46mm, 46.5mm or 47mm; and the radial depth of the third cutting surface 131 is 3.05mm, 3.06mm, 3.07mm, 3.08mm, 3.09mm, 3.10mm, 3.11mm, 3.12mm, 3.13mm, 3.14mm or 3.15mm.

[0061] In this embodiment, by limiting the position, axial length and radial depth of the third cut surface 131, the performance adjustment effect of the third cut surface 131 on the entire ultrasonic bone scalpel head is maximized, thereby ensuring the cutting performance of the ultrasonic bone scalpel head.

[0062] In some embodiments, please refer to Figure 1 The outer peripheral surface of the first segment 110 includes a first cut surface 111 formed by local cutting. The first cut surface 111 is used for assembling the ultrasonic bone scalpel tip with the ultrasonic transducer. The first cut surface 111 not only enables the assembly of the ultrasonic bone scalpel tip, but also allows for the adjustment of the structural performance of the ultrasonic bone scalpel tip.

[0063] Optionally, the first segment 110 includes two first cut surfaces 111 arranged symmetrically with respect to their central axis. It is understood that in other embodiments, the number of first cut surfaces 111 may also be three or more.

[0064] In some embodiments, please refer to Figure 1 , Figure 3 and Figure 4 The outer peripheral surface of the fourth segment 140 includes two fourth cut surfaces 141 symmetrically arranged relative to its central axis; the cutting part 200 has two oppositely arranged first sidewalls 210 and two oppositely arranged second sidewalls (not shown), and the two fourth cut surfaces 141 extend to the two first sidewalls 210 respectively; the two second sidewalls and the distal end face of the cutting part 200 are all provided with cutting teeth 230.

[0065] The two fourth cut surfaces 141 extending to the cutting section 200 create a smooth connection between the scalpel handle 100 and the cutting section 200, reducing structural stress and allowing for adjustment of the ultrasonic bone scalpel tip's structural performance. Furthermore, by designing the cutting section 200 as a sheet and providing cutting teeth 230 on both second sidewalls and the distal end face of the cutting section 200, it can adapt to the cutting needs of different anatomical structures, thus broadening its application range.

[0066] In some embodiments, please refer to Figure 4 The distance between the two first sidewalls 210 is the first thickness. The first thickness gradually decreases from the proximal end to the distal end in at least a partial section, and the minimum value of the first thickness is 0.8mm-1.0mm.

[0067] The minimum range of the first thickness is 0.8mm-1.0mm, meaning the thickness of the distal end of the switching section ranges from 0.8mm to 1.0mm. Specifically, it can be 0.8mm, 0.82mm, 0.84mm, 0.86mm, 0.88mm, 0.9mm, 0.92mm, 0.94mm, 0.96mm, 0.98mm, or 1.0mm. This configuration allows the ultrasonic bone scalpel tip to adapt well to situations requiring precise operation, ensuring cutting accuracy.

[0068] Optionally, the distance between the two second sidewalls is the second thickness, which gradually decreases from the proximal end to the distal end, so that the ultrasonic bone scalpel tip can adapt well to some situations requiring delicate operation.

[0069] Optionally, both opposite cutting surfaces 231 of the cutting tooth 230 are arc-shaped surfaces, which can reduce the damage of the cutting tooth 230 to the surrounding tissue.

[0070] In some embodiments, please refer to Figure 4 and Figure 5 Both first sidewalls 210 are provided with grooves 240 extending from the proximal end to the distal end, and the grooves 240 of the two first sidewalls 210 are not connected. The grooves 240 reduce the contact area between bone tissue and the cutting part 200, thereby reducing the cutting force of the cutting part 200. This results in less friction on the cutting part 200 during cutting, reducing the doctor's workload, facilitating operation, and making bone fragments easier to bend and break, effectively improving cutting efficiency. Simultaneously, the grooves 240 facilitate the removal of bone fragments.

[0071] In some embodiments, the first segment 110, the second segment 120, the third segment 130, the fourth segment 140, and the cutting part 200 are integrally manufactured from a high-strength, biocompatible titanium alloy, which can ensure the structural strength and corrosion resistance of the ultrasonic bone scalpel tip and ensure the cutting stability of the ultrasonic bone scalpel tip.

[0072] Optionally, the wear resistance of the cutting part 200 can be ensured by performing wear-resistant treatment on the cutting part 200.

[0073] Optionally, both the shank portion 100 and the cutting portion 200 are solid structures to ensure the structural strength of the ultrasonic bone scalpel tip. It is understood that in other embodiments, the shank portion 100 and the cutting portion 200 can also be made into hollow structures to ensure overall structural strength while reducing weight.

[0074] This invention, through the above-described design of the ultrasonic bone scalpel tip structure, limits the resonant frequency of the ultrasonic bone scalpel tip to the range of 25kHz-26kHz. The outer diameter and axial length of the first segment 110, second segment 120, third segment 130, and fourth segment 140 are adjusted, as are the positions, axial lengths, and radial depths of the second and third cut surfaces 121 and 131. This yields a relationship diagram between the frequency and amplitude of the ultrasonic bone scalpel. Experiments demonstrate that within the aforementioned frequency range and the design parameters of the tip structure, only one resonant point exists. Figure 6 This is a graph showing the relationship between frequency and amplitude for one set of parameters (horizontal axis is frequency, vertical axis is amplitude).

[0075] On the other hand, this application also provides an ultrasonic bone scalpel system, including an ultrasonic main unit, a transducer, and the aforementioned ultrasonic bone scalpel head. The transducer is connected to the ultrasonic bone scalpel head, and the ultrasonic main unit provides electrical energy to the transducer, which converts the electrical energy into mechanical vibration. The ultrasonic bone scalpel system provided in this application, through the design of the aforementioned ultrasonic bone scalpel head, enables the ultrasonic bone scalpel system to be applied in minimally invasive surgery, thus broadening its application range.

[0076] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An ultrasonic bone scalpel tip, wherein the ultrasonic bone scalpel tip is used to operate in the resonant frequency range of 25KHz-26KHz, characterized in that, The total length L0 of the ultrasonic bone scalpel head ranges from 289.5mm to 299.5mm; and the ultrasonic bone scalpel head includes a shank (100) and a cutting section (200). The shank (100) includes a first segment (110), a second segment (120), a third segment (130), and a fourth segment (140) connected sequentially along its axial direction. The cutting section (200) is connected to the fourth segment (140). The diameters of the first segment (110), the second segment (120), the third segment (130), and the fourth segment (140) decrease sequentially.

2. The ultrasonic bone scalpel head as described in claim 1, characterized in that, The outer peripheral surface of the second rod segment (120) includes a second cut surface (121) formed by local cutting, and the outer peripheral surface of the third rod segment (130) includes a third cut surface (131) formed by local cutting.

3. The ultrasonic bone scalpel head as described in claim 2, characterized in that, The second segment (120) includes two second cut surfaces (121) arranged symmetrically with respect to their central axis, and the third segment (130) includes two third cut surfaces (131) arranged symmetrically with respect to their central axis; one of the second cut surfaces (121) is parallel to one of the third cut surfaces (131), and the other second cut surface (121) is parallel to the other third cut surface (131).

4. The ultrasonic bone scalpel tip as described in claim 3, characterized in that, The first distance (d1) from the second cutting surface (121) to the proximal end face of the tool holder (100) ranges from 75mm to 77mm; the axial length of the second cutting surface (121) ranges from 45mm to 49mm; and the radial depth of the second cutting surface (121) ranges from 3.05mm to 3.15mm. And / or, the second distance (d2) from the third cut surface (131) to the proximal end face of the tool holder (100) ranges from 158mm to 162mm; the axial length of the third cut surface (131) ranges from 45mm to 47mm; and the radial depth of the third cut surface (131) ranges from 3.05mm to 3.15mm.

5. The ultrasonic bone scalpel head as described in claim 1, characterized in that, The outer peripheral surface of the fourth segment (140) includes two fourth cleavage surfaces (141) symmetrically arranged relative to its central axis; the cutting part (200) has two opposing first sidewalls (210) and two opposing second sidewalls, and the two fourth cleavage surfaces (141) extend to the two first sidewalls (210) respectively; the two second sidewalls and the distal end face of the cutting part (200) are all provided with cutting teeth (230).

6. The ultrasonic bone scalpel tip as described in claim 5, characterized in that, The distance between the two first sidewalls (210) is a first thickness, which gradually decreases from the proximal end to the distal end in at least a partial section, and the minimum value of the first thickness is in the range of 0.8 mm to 1.0 mm.

7. The ultrasonic bone scalpel tip as described in claim 1, characterized in that, The outer peripheral surface of the first rod segment (110) includes two first tangential surfaces (111) arranged symmetrically with respect to its central axis.

8. The ultrasonic bone scalpel tip according to any one of claims 1 to 7, characterized in that, The axial length of the first rod segment (110) ranges from 30mm to 34mm, the axial length of the second rod segment (120) ranges from 91.5mm to 107.5mm, the axial length of the third rod segment (130) ranges from 88mm to 107mm, and the axial length of the fourth rod segment (140) ranges from 50.5mm to 59mm. And / or, the outer diameter of the first rod segment (110) is in the range of 7.5mm-8.5mm, the outer diameter of the second rod segment (120) is in the range of 4.0mm-4.4mm, the outer diameter of the third rod segment (130) is in the range of 3.4mm-3.8mm, and the outer diameter of the fourth rod segment (140) is in the range of 2.9mm-3.1mm.

9. The ultrasonic bone scalpel tip according to any one of claims 1 to 7, characterized in that, The proximal end of the second rod segment (120) includes a first transition segment (122) whose outer diameter gradually decreases from the proximal end to the distal end, and the radius of the arc of the first transition segment (122) is in the range of 17mm-18mm; And / or, the proximal end of the third rod segment (130) includes a second transition segment (132) whose outer diameter gradually decreases from the proximal end to the distal end, and the radius of the arc of the second transition segment (132) is in the range of 6.5mm-15mm; And / or, the proximal end of the fourth segment (140) includes a third transition segment (142) with an outer diameter that gradually decreases from the proximal end to the distal end, the radius of the arc of the third transition segment (142) being 16mm-17mm.

10. An ultrasonic bone scalpel system, characterized in that, The device includes an ultrasound host, a transducer, and an ultrasonic bone scalpel head as described in any one of claims 1 to 9, wherein the transducer is connected to the ultrasonic bone scalpel head, the ultrasound host provides electrical energy to the transducer, and the transducer is used to convert the electrical energy into mechanical vibration.

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