High-frequency ultrasonic bone tissue cutting knife

Abstract

The utility model discloses a high-frequency ultrasonic bone tissue cutting knife which comprises an energy converter, a knife body is detachably arranged at one end of the energy converter, the knife body comprises a cutting knife head and a plurality of transmission rod sets, the cutting knife head is arranged at the cutting end of the knife body, the transmission rod sets are connected end to end, each transmission rod set is composed of a wide rod and a narrow rod, and the wide rod is connected with the narrow rod. And the diameter of the wide rod in each group is larger than that of the narrow rod in the group. The utility model aims to provide the high-frequency ultrasonic bone tissue cutting knife which is high in resonant frequency and small in vibration amplitude.

Description

Technical Field

[0001] The utility model relates to medical equipment, in particular to a high-frequency ultrasonic bone tissue cutting knife. Background Art

[0002] Some surgical operations involve cutting or removing bones. Traditional cutting devices have low precision, great trauma, and relatively high requirements for patient indications. This not only prolongs the patient's postoperative recovery period, but also makes the risk of the operation relatively high.

[0003] With the development of science and technology, especially the development of ultrasonic technology, the conditions for combining ultrasonic technology with bone tissue cutting have gradually matured, and ultrasonic bone tissue cutting knives have begun to appear on the market. They use the energy generated by the ultrasonic frequency vibration of the transducer to remove bone tissue. The use of ultrasonic bone tissue cutting knives has the advantages of high surgical precision, less trauma and easy recovery after surgery.

[0004] However, existing ultrasonic bone tissue cutting knives have the following problems: in order to obtain more energy, ultrasonic bone tissue cutting knives usually pursue higher vibration frequencies, which makes the vibration amplitude of the cutting end larger. Since there is a high probability that the nervous system exists near the bones, the large vibration amplitude may damage the nerves during the operation, posing a hidden danger to the operation. Summary of the invention

[0005] Purpose of the utility model: The purpose of the utility model is to provide a high-frequency ultrasonic bone tissue cutting knife with high resonance frequency and small vibration amplitude.

[0006] Technical solution: The utility model discloses a high-frequency ultrasonic bone tissue cutting knife, comprising a transducer, one end of which is detachably provided with a knife body, the knife body comprising a cutting knife head and a plurality of transmission rod groups, the cutting knife head being provided at the cutting end of the knife body, the plurality of transmission rod groups being connected end to end, each transmission rod group being composed of a wide rod and a narrow rod, the diameter of the wide rod in each group being larger than the diameter of the narrow rod in the group. The function of each transmission rod group is to amplify or reduce the vibration amplitude of the transducer, and the amplification or reduction ratio is different according to the diameter of the wide rod and the narrow rod in the group, and the distance between the wide rod and the narrow rod in the group, so as to adjust the stroke of the cutting knife head. The interface between the wide rod and the narrow rod amplifies the vibration amplitude of the transducer, and the interface between the narrow rod and the wide rod reduces the vibration amplitude of the transducer. In addition, the wide rod and the narrow rod also have the function of adjusting the overall impedance of the knife bar. Generally speaking, for the excitation mode controlled by a digital circuit, the impedance of the knife bar is in the range of 10Ω to 100Ω, the vibration of the tip of the knife bar is stable, the power consumption is small, and the surgery can be made safer. When the tool rod impedance is high, the tool rod impedance can be reduced by increasing the length of the narrow rod, reducing the length of the wide rod, or increasing the ratio of the wide rod diameter to the narrow rod diameter. Conversely, when the tool rod impedance is too small, the tool rod impedance can be reduced by reducing the length of the narrow rod, increasing the length of the wide rod, or reducing the ratio of the wide rod diameter to the narrow rod diameter.

[0007] Furthermore, the wide rods in each transmission rod group are arranged at one end close to the transducer. This arrangement is to allow the transducer to be detachably connected to the wide rods in the first transmission rod group, and the end surface of the wide rods in the first transmission rod group connected to the transducer is exactly at the starting point of the ultrasonic wave.

[0008] Furthermore, the overall length of the blade body is an integral multiple of the wavelength of the ultrasonic wave emitted by vibration at the resonance frequency.

[0009] Furthermore, the overall length of each transmission rod group is half the wavelength of the ultrasonic wave emitted by vibration at the resonance frequency.

[0010] Furthermore, the diameter of the narrow rod is larger than the diameter of the cutting head.

[0011] Furthermore, the wide rod and the narrow rod are cylindrical.

[0012] Furthermore, the transducer, the wide rod, the narrow rod and the cutting head are coaxial, and the transducer, the wide rod, the narrow rod and the cutting head are symmetrically arranged about their central axis.

[0013] Furthermore, the diameters of the wide rods in different groups of the transmission rod sets may be different.

[0014] Furthermore, the diameters of the narrow rods in different groups of the transmission rod sets may be different.

[0015] Furthermore, the resonant frequency of the transducer is 38kHz to 42kHz.

[0016] Furthermore, the material of the cutting blade is titanium alloy.

[0017] Beneficial effects: Compared with the prior art, the utility model has the following advantages: the utility model is provided with several groups of transmission rod groups, and the purpose of ultimately adjusting the vibration amplitude of the cutting head is achieved by adjusting the diameters of the wide rods and the narrow rods in each group of transmission rod groups, thereby taking into account both high vibration frequency and small vibration amplitude. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a cross-sectional view of the utility model.

[0019] Figure 2 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0020] Figure 3 This is a schematic diagram of the structure of Example 2 of the utility model.

[0021] Among them: 1. transducer; 2. blade body; 201. first wide rod; 202. first narrow rod; 203. first cutting blade head; 204. second wide rod; 205. second narrow rod; 206. third wide rod; 207. third narrow rod; 208. fourth wide rod; 209. fourth narrow rod; 210. second cutting blade head. DETAILED DESCRIPTION

[0022] The technical solution of the utility model is further described below in conjunction with the accompanying drawings.

[0023] See attached Figure 1 to Figure 3 The utility model shows a high-frequency ultrasonic bone tissue cutting knife, comprising a transducer 1, the resonant frequency of the transducer 1 is 38kHz to 42kHz, a knife body 2 is detachably provided at one end of the transducer 1, the overall length of the knife body 2 is an integer multiple of the wavelength of the ultrasonic wave vibrating at the resonant frequency, the knife body 2 comprises a cutting head and a plurality of transmission rod groups, the cutting head is arranged at the cutting end of the knife body 2, and the material of the cutting head is titanium alloy.

[0024] Several groups of transmission rod groups are connected end to end, and the overall length of each transmission rod group is half the wavelength of the ultrasonic wave vibrating at the resonant frequency. Each transmission rod group consists of a wide rod and a narrow rod, and the wide rod and the narrow rod are cylindrical. The wide rod in each transmission rod group is arranged at one end close to the transducer 1, and the diameter of the wide rod in each group is larger than the diameter of the narrow rod in the group, and the diameter of the narrow rod is larger than the diameter of the cutting head. The transducer 1, the wide rod, the narrow rod and the cutting head are coaxial, and the transducer 1, the wide rod, the narrow rod and the cutting head are symmetrically arranged about their central axes. The diameters of the wide rods in different groups of transmission rod groups can be different, and the diameters of the narrow rods in different groups of transmission rod groups can be different.

[0025] The function of each group of transmission rods is to amplify or reduce the vibration amplitude of the transducer 1. The ratio of amplification or reduction varies according to the diameter of the wide rod and the narrow rod, and the distance between the wide rod and the narrow rod, so as to adjust the stroke of the cutting head. In addition, the impedance of the tool rod can also be adjusted accordingly. The interface between the wide rod and the narrow rod amplifies the vibration amplitude of the transducer 1, and the interface between the narrow rod and the wide rod reduces the vibration amplitude of the transducer 1; the wide rod in each group of transmission rods is set at one end close to the transducer 1, so that the transducer 1 can be detachably connected to the wide rod in the first group of transmission rods, and the end surface where the wide rod in the first group of transmission rods is connected to the transducer 1 is just at the starting point of the ultrasonic wave.

[0026] Example 1

[0027] like Figure 2 A high-frequency ultrasonic bone tissue cutting knife includes a transducer 1, the resonant frequency of the transducer 1 is 40.5kHz, a knife body 2 is detachably provided at one end of the transducer 1, the knife body 2 includes a cutting head and a group of transmission rod groups, the cutting head is arranged at the cutting end of the knife body 2, the material of the cutting head is titanium alloy, the diameter of the first cutting head 203 is 3mm, and the length of the first cutting head 203 is 32.4mm.

[0028] The transmission rod group consists of a first wide rod 201 and a first narrow rod 202, the diameter of the first wide rod 201 is 7.6 mm, the length of the first wide rod 201 is 6.5 mm, the diameter of the first narrow rod 202 is 5 mm, the length of the first narrow rod 202 is 25.5 mm, the first wide rod 201 and the first narrow rod 202 are cylindrical, the first wide rod 201 is arranged at one end close to the transducer 1, the transducer 1, the first wide rod 201, the first narrow rod 202 and the first cutting head 203 are coaxial, and the transducer 1, the first wide rod 201, the first narrow rod 202 and the cutting head are symmetrically arranged about their central axis.

[0029] A more optimal design is that a chamfer is provided at a junction of the first wide rod 201 and the first narrow rod 202 , and at a junction of the first narrow rod 202 and the first cutting blade head 203 , and the chamfer can prevent stress concentration.

[0030] The input impedance of the blade body 2 is about 20Ω, and the maximum amplitude of the first cutting blade head 203 is about 69 um.

[0031] Example 2

[0032] like Figure 3 A high-frequency ultrasonic bone tissue cutting knife includes a transducer 1, the resonant frequency of the transducer 1 is 40.3kHz, a knife body 2 is detachably provided at one end of the transducer 1, the knife body 2 includes a cutting head and three groups of transmission rod groups, the cutting head is arranged at the cutting end of the knife body 2, the material of the cutting head is titanium alloy, the diameter of the second cutting head 210 is 3mm, and the length of the second cutting head 210 is 19.3mm.

[0033] The three transmission rod groups are respectively the first transmission rod group, the second transmission rod group and the third transmission rod group, wherein the first transmission rod group is composed of the second wide rod 204 and the second narrow rod 205, the diameter of the second wide rod 204 is 7.6mm, the length of the second wide rod 204 is 6mm, the diameter of the second narrow rod 205 is 5mm, and the length of the second narrow rod 205 is 31mm; the second transmission rod group is composed of the third wide rod 206 and the third narrow rod 207, the diameter of the third wide rod 206 is 6.2mm, the length of the third wide rod 206 is 4mm, the diameter of the third narrow rod 207 is 4.2mm, and the length of the third narrow rod 207 is 29.1mm; the third transmission rod group is composed of the fourth wide rod 208 and the fourth narrow rod 209, the diameter of the fourth wide rod 208 is 6.1mm, the length of the fourth wide rod 208 is 4 .2mm, the diameter of the fourth narrow rod 209 is 3.6mm, and the length of the fourth narrow rod 209 is 29.4mm; the second wide rod 204, the second narrow rod 205, the third wide rod 206, the third narrow rod 207, the fourth wide rod 208 and the fourth narrow rod 209 are cylindrical, and the second wide rod 204, the third wide rod 206 and the third wide rod 206 are respectively arranged at one end close to the transducer 1, and the transducer 1, the second wide rod 204, the second narrow rod 205, the third wide rod 206, the third narrow rod 207, the fourth wide rod 208, the fourth narrow rod 209 and the second cutting head 210 are coaxial, and the transducer 1, the second wide rod 204, the second narrow rod 205, the third wide rod 206, the third narrow rod 207, the fourth wide rod 208, the fourth narrow rod 209 and the second cutting head 210 are symmetrically arranged about their central axis.

[0034] A more optimal design is that chamfers are provided at the junction of the second wide rod 204 and the second narrow rod 205, the junction of the second narrow rod 205 and the third wide rod 206, the junction of the third wide rod 206 and the third narrow rod 207, the junction of the third narrow rod 207 and the fourth wide rod 208, the junction of the fourth wide rod 208 and the fourth narrow rod 209, and the junction of the fourth narrow rod 209 and the second cutting head 210, and the chamfers can prevent stress concentration.

[0035] The input impedance of the blade body 2 is about 40Ω, and the maximum amplitude of the second cutting blade head 210 is about 70um.

Claims

1. A high-frequency ultrasonic bone tissue cutting knife, characterized in that: The invention comprises a transducer (1), a blade body (2) being detachably arranged at one end of the transducer (1), the blade body (2) comprising a cutting blade head and a plurality of transmission rod groups, the cutting blade head being arranged at the cutting end of the blade body (2), the plurality of transmission rod groups being connected end to end, each transmission rod group being composed of a wide rod and a narrow rod, the diameter of the wide rod in each group being larger than the diameter of the narrow rod in the group, and the resonant frequency of the transducer (1) being 38 kHz to 42 kHz.

2. The high-frequency ultrasonic bone tissue cutting knife according to claim 1, characterized in that: The wide rod in each group of the transmission rods is arranged at one end close to the transducer (1).

3. The high-frequency ultrasonic bone tissue cutting knife according to claim 1, characterized in that: The overall length of the blade body (2) is an integral multiple of the wavelength of the ultrasonic wave emitted by vibration at the resonance frequency.

4. The high-frequency ultrasonic bone tissue cutting knife according to claim 1, characterized in that: The overall length of each transmission rod group is half the wavelength of the ultrasonic wave vibrating at the resonance frequency, and the diameter of the narrow rod is larger than the diameter of the cutting blade.

5. The high-frequency ultrasonic bone tissue cutting knife according to claim 1, characterized in that: The wide rod and the narrow rod are cylindrical.

6. The high-frequency ultrasonic bone tissue cutting knife according to claim 1, characterized in that: The transducer (1), the wide rod, the narrow rod and the cutting blade are coaxial, and the transducer (1), the wide rod, the narrow rod and the cutting blade are symmetrically arranged about their central axis.

7. The high-frequency ultrasonic bone tissue cutting knife according to claim 1, characterized in that: The material of the cutting blade head is titanium alloy.

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