Ultrasonic osteotome cutter

Abstract

The utility model relates to the technical field of medical instruments, in particular to an ultrasonic osteotome. The ultrasonic osteotome tool comprises an amplitude-change pole and a working tool bit which are connected, a first cooling channel is formed in the amplitude-change pole in the central axis direction of the amplitude-change pole, a second cooling channel is formed in the working tool bit, the far end of the second cooling channel is used for outputting cooling liquid, and gas-liquid fluid formed through vibration is used for cooling a cutting area of the working tool bit; the amplitude-change pole comprises a first pole section and a second pole section which are connected, the second pole section is connected with the working tool bit, the diameter of the first cooling channel is D1, the diameter of the first pole section is d1, the diameter of the second pole section is d2, and d1 is larger than d2. Due to the fact that D1 is larger than 0.3 d2 and smaller than 0.5 d2, d1 / d2 is smaller than 4, the cooling efficiency of the working tool bit is improved, meanwhile, the vibration performance is not weakened, and the operation effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, in particular to an ultrasonic osteotome tool. Background Art

[0002] With the rapid development of medical technology, ultrasonic bone knife, as a new and efficient surgical instrument, has been favored by clinical orthopedic surgeons because of its advantages such as precise cutting, good tissue selectivity, little damage to surrounding vascular and nerve tissues, good hemostatic performance, easy operation and low heat generation. It is gradually playing an increasingly important role in medical fields such as plastic surgery, trauma orthopedics, joint surgery, spinal surgery, and dentistry.

[0003] However, due to the limitation of the volume of the working cutter head, it is necessary to increase the cutting force to improve the cutting efficiency, but this will increase the heat generated by the working cutter head and damage the bone tissue. In the prior art, the working cutter head is usually cooled by opening a cooling channel inside the amplitude transformer in the ultrasonic bone cutter and letting the coolant flow out of the working cutter head. The coolant is atomized under high-frequency vibration to form a gas-liquid two-phase fluid. The cooling efficiency and uniformity are better than ordinary pouring cooling, and the energy for atomizing the cooling liquid comes from the vibration energy of the cutter head. If the size of the cooling channel in the amplitude transformer is too large, it is beneficial to increase the flow rate of the cooling liquid and expand the heat dissipation area, but it will cause the amplitude transformer to lose more vibration energy, and also weaken the stiffness of the thin rod of the amplitude transformer; if the size of the cooling channel in the amplitude transformer is too small, it will reduce the cooling liquid flow rate that can be accommodated, reduce the heat dissipation area, and affect the cooling effect of the bone tissue cutting area. Therefore, there is an urgent need for an ultrasonic bone cutter that can ensure both the cooling efficiency of the working cutter head and its vibration performance. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the utility model provides an ultrasonic bone knife tool, which solves the technical problem that the existing ultrasonic bone knife tool cannot simultaneously ensure the cooling efficiency and vibration performance of the working knife head.

[0006] (II) Technical solution

[0007] In order to achieve the above-mentioned purpose, the main technical solutions adopted by the utility model include:

[0008] The utility model embodiment provides an ultrasonic bone knife tool, including a connected amplitude change rod and a working knife head; a first cooling channel is opened inside the amplitude change rod along its central axis direction, and a second cooling channel is opened inside the working knife head; the proximal end of the first cooling channel is used to pass coolant, the distal end of the first cooling channel is connected with the proximal end of the second cooling channel, and the distal end of the second cooling channel is used to output the gas-liquid fluid formed by the vibration of the coolant to cool the cutting area of ​​the working knife head; the amplitude change rod and the first cooling channel are both rotating body structures, the amplitude change rod includes a first rod segment and a second rod segment connected, and the second rod segment is connected to the working knife head; the diameter of the first cooling channel is D1, the diameter of the first rod segment is d1, and the diameter of the second rod segment is d2, and d1 is greater than d2; wherein, 0.3d2<D1<0.5d2, d1 / d2<4.

[0009] Preferably, the first rod segment and the second rod segment are transitioned through an arc.

[0010] Preferably, D1=0.4d2; d1 / d2=3.

[0011] Preferably, the horn and the working cutter head are both made of titanium alloy.

[0012] Preferably, the working blade head is a cutting blade head, an arc serrated blade head, a flat-head serrated blade head, an oblique-edged serrated blade head, a planing blade head or a grinding blade head; the working blade head is integrally formed with the amplitude transformer or is detachably connected.

[0013] Preferably, when the working cutter head is a cutting cutter head, an arc serrated cutter head, a flat-head serrated cutter head or a bevel-edged serrated cutter head; the working cutter head includes a connected mounting portion and a cutting portion, the cutting portion is a sheet-like structure, and a drainage flow hole is provided on the cutting portion; the drainage flow hole is a long strip structure extending in the length direction of the cutting portion, and the drainage flow hole passes through the thickness direction of the working cutter head; a first channel is provided in the mounting portion, and a second channel is provided in the cutting portion, and the first channel and the second channel are connected to form a second cooling channel; one end of the drainage flow hole is connected to the second cooling channel, and the coolant in the second cooling channel is vibrated to form a gas-liquid fluid and then passes through the drainage flow hole to cool the cutting area of ​​the working cutter head.

[0014] Preferably, the diameter of the first channel is larger than the diameter of the second channel.

[0015] Preferably, the thickness of the cutting portion is 0.8 mm-1.2 mm.

[0016] Preferably, a flow guiding slope is provided on one side of the discharge flow hole away from the first rod section; the thickness of the flow guiding slope gradually decreases in the direction from the cutting portion to the amplitude changing rod.

[0017] Preferably, when the working cutter head is a planing cutter head or a grinding cutter head, the distal end of the second cooling channel in the working cutter head extends to the tip of the working cutter head.

[0018] (III) Beneficial effects

[0019] The beneficial effects of the utility model are:

[0020] In the ultrasonic bone knife tool of the utility model, the diameter of the first cooling channel in the working knife head is D1, the diameter of the first rod segment in the amplitude rod is d1, and the diameter of the second rod segment in the amplitude rod is d2, d1 is greater than d2, and since 0.3d2<D1<0.5d2, d1 / d2<4, the cooling efficiency of the working knife head is improved while the vibration performance of the amplitude rod is not weakened, and the stiffness of the thin rod in the amplitude rod is increased as much as possible, thereby reducing thermal damage to bone tissue and avoiding bending of the amplitude rod, thereby improving cutting accuracy during surgery and improving surgical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the structure of the ultrasonic bone knife tool in Example 1 (the working knife head is a cutting knife head);

[0022] Figure 2 for Figure 1 A cross-sectional schematic diagram from the first perspective;

[0023] Figure 3 for Figure 1 A cross-sectional schematic diagram from a second viewing angle;

[0024] Figure 4 This is a schematic diagram of the structure in which the working cutter head in the second embodiment is a circular sawtooth cutter head;

[0025] Figure 5 This is a schematic diagram of the structure in which the working cutter head in the third embodiment is a flat-head serrated cutter head;

[0026] Figure 6 This is a schematic diagram of the structure of the working cutter head in the fourth embodiment, which is a bevel-edged sawtooth cutter head;

[0027] Figure 7 Schematic cross-sectional view of the ultrasonic bone knife tool in Example 5 (the working knife head is a planing knife head);

[0028] Figure 8 It is a cross-sectional schematic diagram of the ultrasonic bone knife tool in Example 6 (the working knife head is a grinding knife head).

[0029] [Description of Reference Numerals]

[0030] 1: horn; 11: first rod section; 12: second rod section; 13: first cooling channel;

[0031] 2: working cutter head; 21: second cooling channel; 211: first channel; 212: second channel; 22: mounting portion; 23: cutting portion; 231: drainage hole; 24: flow guide slope. DETAILED DESCRIPTION

[0032] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0033] like Figure 1-Figure 8 As shown, an embodiment of the utility model provides an ultrasonic bone knife tool, which includes a connected amplitude rod 1 and a working blade 2. The interior of the amplitude rod 1 is provided with a first cooling channel 13 along the central axis direction thereof, and the working blade 2 is provided with a second cooling channel 21. The proximal end of the first cooling channel 13 is used to pass the coolant, the distal end of the first cooling channel 13 is connected with the proximal end of the second cooling channel 21, and the distal end of the second cooling channel 21 is used to output the coolant. The coolant vibrates through the working blade 2 to form a gas-liquid fluid, and the gas-liquid fluid can cool the cutting area of ​​the working blade 2. The amplitude rod 1 and the first cooling channel 13 are both rotating body structures. The amplitude rod 1 includes a first rod segment 11 and a second rod segment 12 connected, and the second rod segment 12 is connected to the working blade 2. It should be noted that the proximal end is the end close to the operator, and the distal end is the end away from the operator.

[0034] The diameter of the first cooling channel 13 is D1, the diameter of the first rod segment 11 is d1, and the diameter of the second rod segment 12 is d2. d1 is greater than d2, that is, the diameter of the first rod segment 11 is greater than the diameter of the second rod segment 12, wherein 0.3d2<D1<0.5d2, d1 / d2<4. Since the diameter D1 of the first cooling channel 13, the diameter d1 of the first rod segment 11, and the diameter d2 of the second rod segment 12 are selected according to 0.3d2<D1<0.5d2, d1 / d2<4 in this embodiment, the cooling efficiency of the working cutter head 2 is ensured without weakening the vibration performance of the amplitude transformer, and the stiffness of the thin rod in the amplitude transformer 1 is increased as much as possible, thereby reducing the thermal damage of the bone tissue and avoiding the bending of the amplitude transformer 1, improving the cutting accuracy during the operation, and improving the surgical effect. Preferably, D1=0.4d2; d1 / d2=3.

[0035] The diameter selection of the first rod segment 11 and the second rod segment 12 also avoids the generation of local resonance.

[0036] Preferably, in order to achieve a better amplitude amplification effect and avoid stress concentration at the connection between the first rod segment 11 and the second rod segment 12, the first rod segment 11 and the second rod segment 12 are transitioned by an arc. The proximal end of the first rod segment 11 is used to connect with the ultrasonic transducer. In actual application, the connection between the amplitude transformer 1 and the working blade 2 can be selected as an integral molding or a detachable connection according to actual conditions.

[0037] The materials of the amplitude transformer 1 and the working blade head 2 are both titanium alloy, so that the manufactured working blade head 2 has high strength, light weight, and is easy to use. At the same time, the titanium alloy material has good biocompatibility, which reduces the risk of surgery.

[0038] like Figure 1 , Figure 4-8 As shown, the working tool head 2 can be a cutting tool head, an arc serrated tool head, a flat-head serrated tool head, a bevel-edged serrated tool head, a planing tool head or a grinding tool head.

[0039] like Figure 1 , Figure 4-Figure 6 As shown, when the working cutter head 2 is a cutting cutter head, an arc serrated cutter head, a flat-head serrated cutter head or an oblique-edge serrated cutter head, the working cutter head 2 is connected to the amplitude transformer 1 through a threaded connection.

[0040] Specifically, take the working blade 2 as a cutting blade as an example. Figure 2-Figure 3 As shown, the working cutter head 2 includes a connected mounting portion 22 and a cutting portion 23, the cutting portion 23 is a sheet structure, and a drainage flow hole 231 is opened on the cutting portion 23, and the drainage flow hole 231 is a long strip structure extending in the length direction of the cutting portion 23, and the drainage flow hole 231 passes through along the thickness direction of the working cutter head 2, and then the cooling medium is ejected from the drainage flow hole 231 area, when the working cutter head 2 is a cutting cutter head, its cutting area is the tip of the cutter, and the distal end of the drainage flow hole 231 is closer to the tip of the cutter to cool the tip of the cutter, and when the working cutter head 2 is an arc serrated cutter head, a flat-head serrated cutter head or a bevel-edged serrated cutter head, its cutting area is the tip of the cutter and the side edge, and the two sides of the drainage flow hole 231 are close to the side edge, and the distal end of the drainage flow hole 231 is close to the tip of the cutter, so as to cool the tip of the cutter and the side edge at the same time to avoid thermal damage to bone tissue.

[0041] A first channel 211 is provided in the mounting portion 22, and a second channel 212 is provided in the cutting portion 23. The first channel 211 and the second channel 212 are connected to form a second cooling channel 21. One end of the leakage flow hole 231 is connected to the second cooling channel 21. The coolant in the second cooling channel 21 is vibrated to form a gas-liquid fluid and then sprayed through the leakage flow hole 231 to cool the cutting area of ​​the working cutter head 2. A guide slope 24 is provided on one side of the leakage flow hole 231 away from the first rod segment 11, and the thickness of the guide slope 24 gradually decreases from the cutting portion 23 to the horn 1.

[0042] In this embodiment, the discharge flow hole 231 is located at the central axis of the cutting portion 23 of the working cutter head 2, and a symmetrical guide slope 24 is provided at the end of the discharge flow groove for diversion, thereby guiding the gas-liquid fluid to reach the cutting area of ​​the working cutter head 2 accurately and evenly, further improving the cooling effect and ensuring the safety of surgical treatment.

[0043] Considering that the working cutter head 2 gradually changes into a thin sheet from the proximal end to the distal end, the second cooling channel 21 is designed as a stepped hole, that is, the diameter of the first channel 211 is larger than the diameter of the second channel 212. At the same time, the diameter of the first cooling channel 13 in the amplitude transformer 1 is larger than the maximum diameter of the second cooling channel 21, which can increase the contact area between the coolant and the inner wall of the amplitude transformer 1, effectively reduce the temperature rise phenomenon caused by the deformation and heating of the amplitude transformer 1 due to high-frequency vibration, and maintain the stability of the vibration system. The cutting portion 23 of the working cutter head 2 adopts a small diameter hole to ensure that the strength of the working cutter head 2 is sufficient. In order to further improve the cooling effect, the aperture should be smaller than the thickness of the cutting portion 23 so that the coolant outlet is closer to the tip of the cutter. It should be noted that the second cooling channel 21 is also a rotating body structure.

[0044] In this embodiment, the thickness of the cutting portion 23 of the working blade 2 is 0.8mm-1.2mm, which ensures uniform internal stress distribution. It has a certain rigidity to prevent the blade from breaking, and meets the needs of small space cutting operations, ensuring a smooth and flat cut surface, which is conducive to postoperative suturing of the incision.

[0045] like Figure 7-8 As shown, when the working cutter head 2 is a planing cutter head or a grinding cutter head, the distal end of the second cooling channel 21 in the working cutter head 2 extends to the tip of the working cutter head 2. When the working cutter head 2 is a planing cutter head, the working cutter head 2 can be detachably connected to the amplitude rod 1, and the diameter of the second cooling channel 21 is smaller than the diameter of the first cooling channel 13. When the working cutter head 2 is a grinding cutter head, the working cutter head 2 is integrally formed with the amplitude rod 1, and the diameter of the second cooling channel 21 is the same as the diameter of the first cooling channel 13.

[0046] In the description of the present utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0047] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In the present utility model, unless otherwise clearly specified and limited, when a first feature is “on” or “below” a second feature, it may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above”, “above” or “above” a second feature, it may be that the first feature is directly above or obliquely above the second feature, or it may simply mean that the first feature is higher in level than the second feature. When a first feature is “below”, “below” or “below” a second feature, it may be that the first feature is directly below or obliquely below the second feature, or it may simply mean that the first feature is lower in level than the second feature.

[0049] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0050] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An ultrasonic bone knife tool, characterized in that: It comprises a connected amplitude change rod (1) and a working cutter head (2); A first cooling channel (13) is provided inside the horn (1) along the central axis direction thereof, and a second cooling channel (21) is provided inside the working cutter head (2); The proximal end of the first cooling channel (13) is used to pass a coolant, the distal end of the first cooling channel (13) is connected to the proximal end of the second cooling channel (21), and the distal end of the second cooling channel (21) is used to output a gas-liquid fluid formed by the vibration of the coolant to cool the cutting area of ​​the working cutter head (2); The horn (1) and the first cooling channel (13) are both rotating body structures; the horn (1) comprises a first rod segment (11) and a second rod segment (12) which are connected; the second rod segment (12) is connected to the working cutter head (2); The diameter of the first cooling channel (13) is D1, the diameter of the first rod segment (11) is d1, and the diameter of the second rod segment (12) is d2, wherein d1 is greater than d2; Among them, 0.3d2<D1<0.5d2, d1 / d2<4.

2. The ultrasonic osteotome tool according to claim 1, characterized in that: The first rod segment (11) and the second rod segment (12) are transitioned through an arc.

3. The ultrasonic osteotome tool according to claim 1, characterized in that: D1=0.4d2; d1 / d2=3.

4. The ultrasonic osteotome tool according to claim 1, characterized in that: The horn (1) and the working cutter head (2) are both made of titanium alloy.

5. The ultrasonic osteotome tool according to claim 1, characterized in that: The working blade (2) is a cutting blade, a circular sawtooth blade, a flat-head sawtooth blade, a bevel-edged sawtooth blade, a planing blade or a grinding blade; The working cutter head (2) and the amplitude transformer (1) are integrally formed or detachably connected.

6. The ultrasonic osteotome tool according to claim 5, characterized in that: When the working blade (2) is the cutting blade, the arc serrated blade, the flat-head serrated blade or the bevel-edged serrated blade; The working cutter head (2) comprises a connected mounting portion (22) and a cutting portion (23); the cutting portion (23) is a sheet-like structure, and a drainage hole (231) is provided on the cutting portion (23); The drainage hole (231) is a long strip structure extending in the length direction of the cutting portion (23), and the drainage hole (231) penetrates along the thickness direction of the working cutter head (2); A first channel (211) is provided in the mounting portion (22), a second channel (212) is provided in the cutting portion (23), and the first channel (211) and the second channel (212) are connected to form the second cooling channel (21); One end of the leakage flow hole (231) is in communication with the second cooling channel (21); the coolant in the second cooling channel (21) is vibrated to form the gas-liquid fluid and then passes through the leakage flow hole (231) to cool the cutting area of ​​the working tool head (2).

7. The ultrasonic osteotome tool according to claim 6, characterized in that: The diameter of the first channel (211) is greater than the diameter of the second channel (212).

8. The ultrasonic osteotome tool according to claim 6, characterized in that: The thickness of the cutting portion (23) is 0.8 mm-1.2 mm.

9. The ultrasonic osteotome tool according to claim 6, characterized in that: A flow guiding inclined surface (24) is provided on a side of the leakage flow hole (231) away from the first rod section (11); The thickness of the guide slope (24) gradually decreases in a direction from the cutting portion (23) to the amplitude transformer (1).

10. The ultrasonic osteotome tool according to claim 5, characterized in that: When the working cutter head (2) is a planing cutter head or a grinding cutter head; The distal end of the second cooling channel (21) in the working cutter head (2) extends to the tip of the working cutter head (2).

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