CN110575228A - Cutter bar structure of ultrasonic scalpel and ultrasonic scalpel - Google Patents
Cutter bar structure of ultrasonic scalpel and ultrasonic scalpel Download PDFInfo
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- CN110575228A CN110575228A CN201910911327.7A CN201910911327A CN110575228A CN 110575228 A CN110575228 A CN 110575228A CN 201910911327 A CN201910911327 A CN 201910911327A CN 110575228 A CN110575228 A CN 110575228A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/32—Surgical cutting instruments
- A61B17/320068—Surgical cutting instruments using mechanical vibrations, e.g. ultrasonic
Abstract
The invention provides a cutter bar structure of an ultrasonic scalpel and the ultrasonic scalpel, wherein the length of the cutter bar structure is 380mm, the cutter bar structure comprises a tail part, a coupling area I, a thickness alternating area and a coupling area II which are sequentially connected, the thickness alternating area is formed by alternating cylinders with different diameters, and the tail part, the coupling area I and the coupling area II are all cylinders; the thickness alternating region is provided with five thin structures and five thick structures, the diameters of all the thick structures are equal, the diameters of all the thin structures are equal, the diameter difference between the thick structures and the thin structures is smaller than 0.3mm, the coupling region I is connected with the thin structures in the thickness alternating region, and the coupling region II is connected with the thick structures in the thickness alternating region. The invention can work safely in a fixed frequency range without causing operation difficulty or unsafe use due to frequency drift; when the ultrasonic wave passes through the thickness alternating structure, the amplitude of the ultrasonic scalpel bit can be enhanced, and the electric energy conversion efficiency is improved.
Description
Technical Field
The invention belongs to the field of ultrasonic medical treatment, and particularly relates to a cutter bar structure of an ultrasonic scalpel and the ultrasonic scalpel.
Background
Clinically, ultrasonic surgical knives have a very good effect, for example: the incision is neat, hemostasis is fast, the thermal damage scope is little, the smog that produces etc. now becomes clinical operation's important instrument, along with the continuous development of science and technology, also higher and higher to ultrasonic scalpel's requirement, these problems mainly show in ultrasonic scalpel is at the in-process of work, receive external disturbance and load effect easily, make its vibration mode convert other vibration modes into by simple longitudinal vibration very easily, thereby influence ultrasonic scalpel's work efficiency and cutting ability, thereby cause certain difficulty to clinician's accurate control to the scalpel, and then influence the operation effect, harm patient's personal safety even, traditional ultrasonic scalpel has gradually not solved these needs.
Disclosure of Invention
In view of the above, the present invention is directed to a knife bar structure of an ultrasonic scalpel and an ultrasonic scalpel, which can safely work in a fixed frequency range without causing operation difficulty or unsafe use due to frequency drift; when the ultrasonic transducer works, the generated ultrasonic waves pass through the thickness alternating structure, the amplitude of the cutter head of the ultrasonic scalpel can be enhanced, and the electric energy conversion efficiency is improved.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
A cutter bar structure of an ultrasonic scalpel is 380mm in length and comprises a tail part, a coupling area I, a thickness alternating area and a coupling area II which are sequentially connected, wherein the thickness alternating area is formed by cylinders with different diameters in an alternating mode, the tail part is a cylinder, the diameter of the cylinder is 4.68mm, the length of the cylinder is 22.8mm, the coupling area I is a cylinder, the diameter of the cylinder is 3.2mm, the length of the cylinder is 20mm, and the coupling area II is a cylinder, the diameter of the cylinder is 3.8mm, and the length of the cylinder is 20 mm; the thickness alternating region is provided with five thin structures and five thick structures, and the lengths of the five thin structures from the tail part to the coupling region in two directions are respectively as follows: 30.2mm, 10mm, 20mm, 10mm, 12mm, the length of five coarse structure is respectively in proper order: 80mm, 20mm, 25mm, 30mm, 80 mm; the diameters of all the coarse structures are equal, the diameters of all the fine structures are equal, the diameter difference between the coarse structures and the fine structures is smaller than 0.3mm, the coupling area I is connected with the fine structures in the thickness alternating area, and the coupling area II is connected with the coarse structures in the thickness alternating area.
Further, the tool holder structure has a central axis, all of the coarse and fine structures are symmetrical about the central axis, and the centers of gravity of all of the coarse and fine structures are on the central axis.
Further, the diameter of all the coarse structures is 2.84mm, and the diameter of all the fine structures is 2.6 mm.
Furthermore, a threaded hole is formed in the tail part of the tail part, and the tail part of the tail part is connected with the transducer through a screw.
further, the threaded hole is an M3 threaded hole, and the depth is 7 mm.
furthermore, all coarse structure with all thin structure all has the fillet transition, and fillet radius is 0.05 mm.
An ultrasonic scalpel comprises a scalpel head and a scalpel bar structure of the ultrasonic scalpel in any scheme, wherein the scalpel head is connected with a second coupling area, the length of the scalpel head is 23.5mm, one end of the scalpel head is of a cylindrical structure, and the diameter of the scalpel head is 2.14 mm.
Compared with the prior art, the cutter bar structure of the ultrasonic scalpel and the ultrasonic scalpel provided by the invention have the following advantages:
According to the cutter bar structure of the ultrasonic scalpel and the ultrasonic scalpel, the cutter bar structure adopts a structure (irregular structure) with alternating thicknesses, so that when ultrasonic waves pass through the structure, sound wave longitudinal vibration and transverse vibration are formed in the alternating structure. According to the wave acoustic principle, sound waves are transmitted in a bounded rod, when the length of the rod is an integral multiple of half wavelength, the rod resonates, and the maximum output amplitude is obtained at the free end of the rod. When the sound wave propagates in each structure, the sound wave generates longitudinal vibration and transverse vibration due to the relationship between the wavelength and the structure period and propagates forwards in each structure, the vibration is generated in each structure, the structure generates resonance, and the energy of the resonance can be directly transmitted to the cutter head to enable the cutter head to generate strong vibration, so that the cutter head is suitable for medical operation. The structure with different thicknesses is designed at the position of the cutter bar, so that longitudinal vibration can be effectively improved, and transverse vibration can be weakened; secondly, when the sound wave transmitted to the cutter head part and the returned sound wave are offset due to phase difference, after passing through a plurality of structures with different thicknesses, the energy of the sound wave is completely absorbed, so that the cutter head works stably, and the cutting effect of the ultrasonic cutter is enhanced.
The arrangement of the first coupling area is used for transition conduction, the arrangement of the first coupling area effectively prevents sound waves from directly entering the cutter bar (irregular thickness alternating area), the diameter difference between the tail end and the thin structure is too large, so that the stress is too large, the diameter difference is reduced by the arrangement of the first coupling area, and the cutter bar is effectively prevented from being broken; the second coupling area is arranged to prevent the cutter bar from colliding with the tube wall of the scalpel due to the fact that the vibration amplitude of the cutter bar is large in the working process of the cutter bar, and the second coupling area is equivalent to a fixed end.
The medical ultrasonic scalpel can safely work in a fixed frequency (55.5kHz) range, and cannot generate operation difficulty or use insecurity due to frequency drift; when ultrasonic waves generated by the ultrasonic transducer during working pass through the thickness alternating structure, the amplitude of the cutter head of the ultrasonic scalpel can be enhanced, and the electric energy conversion efficiency is improved.
drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural diagram of a conventional ultrasonic scalpel;
FIG. 2 is a schematic diagram of the amplitude of a prior art ultrasonic scalpel at a frequency of 55.5 kHz;
FIG. 3 is a stress diagram of a conventional ultrasonic scalpel at a frequency of 55.5 kHz;
FIG. 4 is a schematic structural view of an ultrasonic surgical blade of the present invention;
FIG. 5 is a schematic graph of the amplitude of the ultrasonic surgical blade of the present invention at a frequency of 55.5 kHz;
FIG. 6 is a stress diagram of the ultrasonic surgical blade of the present invention at a frequency of 55.5 kHz;
Fig. 7 is a schematic view of an ultrasonic surgical blade with a round corner treatment.
Detailed Description
it should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Fig. 1 shows a conventional ultrasonic scalpel having a tail portion, an elongated blade, and a blade, and the conventional ultrasonic scalpel has an amplitude diagram and a stress diagram at a fixed frequency of 55.5kHz as shown in fig. 2 and 3. The length of a slender cutter rod of the existing ultrasonic scalpel is 357.2mm, the length of the tail of the existing ultrasonic scalpel is 22.8mm, and the length of a cutter head of the existing ultrasonic scalpel is 23.5mm.
as shown in fig. 4, an ultrasonic scalpel comprises a scalpel bar structure and a scalpel head a2, wherein the total length of the scalpel bar structure is 403.5mm, the length of the scalpel bar structure is 380mm, the length of the scalpel head a2 is 23.5mm, the scalpel bar structure comprises a tail portion a1, a coupling region one D1, a thickness alternating region and a coupling region two D2 which are sequentially connected, the coupling region two D2 is connected with the scalpel head a2, one end of the scalpel head a2, which is connected with the coupling region two D2, is a cylindrical structure, the diameter of the end is 2.14mm, the thickness alternating region is composed of cylinders with different diameters in an alternating manner, the tail portion a1 is a cylinder, the diameter of the tail portion a is 4.68mm, and the length of the tail portion a is 22.8; the first coupling area D1 is a cylinder with a diameter of 3.2mm and a length of 20 mm; the second coupling area D2 is a cylinder with the diameter of 3.8mm and the length of 20 mm; the thickness alternating region is provided with five thin structures and five thick structures, the five thin structures are marked as C1, C2, C3, C4 and C5 in sequence from the tail part A1 to the cutter head A2, and the lengths are respectively as follows in sequence: 30.2mm, 10mm, 20mm, 10mm, 12 mm; the five coarse structures are marked as B1, B2, B3, B4 and B5 in sequence, and the lengths are respectively as follows: 80mm, 20mm, 25mm, 30mm, 80 mm; all the diameters of the coarse structures are equal, all the diameters of the fine structures are equal, and the diameter difference between the coarse structures and the fine structures is less than 0.3mm, and the diameters of the coarse structures and the fine structures are as follows: the diameter of all the coarse structures is 2.84mm, the diameter of all the fine structures is 2.6mm, the coupling area I D1 is connected with the fine structure C1, and the coupling area II D2 is connected with the coarse structure B5.
the tool bar structure has a central axis, all of the coarse and fine structures are symmetrical about the central axis, and the centers of gravity of all of the coarse and fine structures are on the central axis.
The tail part is provided with a threaded hole and is connected with the transducer through a screw. The screw hole is the M3 screw hole, and the degree of depth is 7 mm. The tail A1 is connected with the transducer; the coupling segment D1 is connected to the alternating thick and thin structure to couple the ultrasonic waves generated by the transducer into the alternating thick and thin structure.
As shown in fig. 7, all the coarse structures and all the fine structures have rounded transitions, and the radius of the rounded corners is 0.05 mm. The scalpel with the structure still has the advantages of the scalpel, stress is smoother when the scalpel bar vibrates, the stress at the connection position of the thick and thin structure of the scalpel is relatively smaller, the possibility of sudden breakage of the scalpel bar structure is avoided, and the added aesthetic degree of the structure is more attractive compared with the scalpel.
In the application, the lengths of all the thick structures B1-B5 are unequal, the lengths of all the thin structures C1-C5 are unequal, and when the lengths of the thick structures and the thin structures are unequal, the vibration intensity of the cutter head A2 is larger than that when the lengths of the thick structures B1-B5 and the thin structures C1-C5 are equal when the working frequency passes through, the amplitude is large, the generated transverse wave is weaker, and the working precision is higher; all the coarse structures B1-B5 are the same in shape, all the fine structures C1-C5 are the same in shape, and when the structure is adopted, the vibration intensity of the cutter head A2 is different or not completely the same as that of all the coarse structures B1-B5 when the working frequency passes through the ultrasonic knife, all the fine structures C1-C5 are stronger when the shapes are different or not completely the same, the amplitude is larger, and transverse waves influencing the amplitude of the cutter head A2 are weaker; further, the cutter head a2 vibrates in the direction of the center axis L, and the vibration is more stable.
By comparing fig. 2 and 4, it can be seen that the vibration of the knife bar structure of the present application is reduced compared to the vibration of the knife bar of the prior art scalpel at the frequency of 55.5kHz, and the vibration of the knife head of the present application is enhanced compared to the vibration of the knife head of the prior art scalpel; by comparing fig. 3 and fig. 5, it can be seen that the stress of the cutter bar structure of the present application is reduced at the frequency of 55.5kHz compared with the stress of the cutter bar of the prior scalpel, and the probability of fracture failure of the cutter bar when the scalpel is in operation is greatly reduced.
According to the wave acoustic principle, sound waves propagate in a bounded rod, when the length of the rod is an integral multiple of half wavelength, the rod resonates, and the maximum output amplitude is obtained at the free end of the rod, in the application, the frequency of ultrasonic waves is 55.5kHz, the material of an ultrasonic knife is a titanium alloy material, the wave speed v of the ultrasonic waves transmitted in the ultrasonic knife is 5090m/s, the total length L of the ultrasonic knife can be calculated according to the formula lambda v/f and L lambda n/2(n is 1,2,3, … infinity), n is 9, the total length L of the ultrasonic knife is the sum of the length of a knife bar structure and the length of a knife head, the application calculates that the theoretical length L is 412.7mm, but because the transducer realizes the transmission of the ultrasonic waves by a pressing sheet, the frequency of the ultrasonic waves has a certain variation range, theoretically 55.5kHz, and therefore the intermediate length of the ultrasonic knife is in the range of-4% of the theoretical length, the application takes L as 403.5mm, and comprises the following steps of; in order to ensure that the free end (cutter head) has stronger longitudinal vibration, according to the energy conservation theory, the local longitudinal vibration of the cutter bar can be reduced by thickening a certain part in a finite rod, so that the vibration of the free end (cutter head) is enhanced; and through greatly thickening in longitudinal displacement, can effectively restrain longitudinal vibration amplitude more, consequently set for every trough department that the ultrasonic wave passed through the pole with the position of the thickening of cutter arbor structure, will reduce the longitudinal vibration of cutter arbor department like this for the longitudinal vibration of cutter head position obtains strengthening, and the cutting effect of ultrasonic knife is better.
When being such thickness alternate structure in the middle of the cutter arbor, the ultrasonic wave can form the different sound wave of two kinds of propagation states in the cutter arbor according to the direction of propagation and frequency difference when passing through the cutter arbor, is respectively: longitudinal waves and transverse waves. When the sound wave propagates in the cutter bar, the wavelength of the sound wave and the alternate structure relation form longitudinal wave forward transmission, the structure generates resonance when transmitted in each structure, and the energy generated by the sound wave is transmitted to the cutter head part along with the resonance forward, so that the cutter head is strongly vibrated, and the cutter head can be applied to operation. Meanwhile, transverse waves are formed in the cutter bar, cannot be transmitted forwards and are retained in the cutter bar, but the transverse waves and the longitudinal waves are offset due to phase difference, so that the transverse waves and the longitudinal waves pass through a plurality of coarse and fine structures and are partially fed back to the cutter head, and the fed back longitudinal waves and the transverse waves in the cutter bar are offset due to phase difference, so that energy generated by the fed back longitudinal waves is almost absorbed, the cutter head is closer to a pure longitudinal vibration mode, and the cutting effect of the cutter head is enhanced.
in addition, according to the phononic crystal theory, the band gap structures of longitudinal waves and transverse waves of the infinite period variable cross-section long rod are respectively calculated by using a concentrated mass method and a transfer matrix method, and the geometric parameters of the cutter bar of the ultrasonic scalpel are determined. By utilizing a finite element method, the band gap characteristic of a slender rod with a finite period is simulated and calculated, the vibration mode of the cutter bar is controlled by adjusting the geometric structure of the cutter bar, so that the longitudinal wave vibration of 55.5kHz is in the pass band of the phononic crystal, and the transverse vibration is in the stop band of the phononic crystal, so that the longitudinal wave can pass through without attenuation, namely the transmission characteristic of 'passing longitudinal vibration and stopping transverse vibration' is realized.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. The utility model provides a cutter arbor structure of supersound scalpel which characterized in that: the length of the coupling device is 380mm, the coupling device comprises a tail part, a coupling area I, a thickness alternating area and a coupling area II which are sequentially connected, wherein the thickness alternating area is formed by alternating cylinders with different diameters, the tail part is a cylinder, the diameter of the tail part is 4.68mm, the length of the tail part is 22.8mm, the coupling area I is a cylinder, the diameter of the coupling area I is 3.2mm, the length of the coupling area II is 20mm, the diameter of the coupling area II is 3.8mm, and the length of the coupling area II is 20 mm; the thickness alternating region is provided with five thin structures and five thick structures, and the lengths of the five thin structures from the tail part to the coupling region in two directions are respectively as follows: 30.2mm, 10mm, 20mm, 10mm, 12mm, the length of five coarse structure is respectively in proper order: 80mm, 20mm, 25mm, 30mm, 80 mm; the diameters of all the coarse structures are equal, the diameters of all the fine structures are equal, the diameter difference between the coarse structures and the fine structures is smaller than 0.3mm, the coupling area I is connected with the fine structures in the thickness alternating area, and the coupling area II is connected with the coarse structures in the thickness alternating area.
2. The blade bar structure of an ultrasonic surgical blade as claimed in claim 1, wherein: the tool bar structure has a central axis, all of the coarse and fine structures are symmetrical about the central axis, and the centers of gravity of all of the coarse and fine structures are on the central axis.
3. The blade bar structure of an ultrasonic surgical blade as claimed in claim 1, wherein: all the coarse structures had a diameter of 2.84mm and all the fine structures had a diameter of 2.6 mm.
4. The blade bar structure of an ultrasonic surgical blade as claimed in claim 1, wherein: the tail part is provided with a threaded hole and is connected with the transducer through a screw.
5. The blade bar structure of an ultrasonic surgical blade as claimed in claim 4, wherein: the screw hole is the M3 screw hole, and the degree of depth is 7 mm.
6. The blade bar structure of an ultrasonic surgical blade as claimed in claim 1, wherein: all coarse structure all with all thin structure all has the fillet transition, and fillet radius is 0.05 mm.
7. An ultrasonic surgical blade characterized in that: the blade holder structure comprising a blade and the ultrasonic surgical blade as claimed in any one of claims 1 to 6, wherein the blade is connected with the second coupling region, the blade has a length of 23.5mm, and one end of the blade has a cylindrical structure with a diameter of 2.14 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910911327.7A CN110575228B (en) | 2019-09-25 | 2019-09-25 | Cutter bar structure of ultrasonic scalpel and ultrasonic scalpel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910911327.7A CN110575228B (en) | 2019-09-25 | 2019-09-25 | Cutter bar structure of ultrasonic scalpel and ultrasonic scalpel |
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| CN110575228A true CN110575228A (en) | 2019-12-17 |
| CN110575228B CN110575228B (en) | 2021-02-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115138546A (en) * | 2022-06-29 | 2022-10-04 | 湖南大学 | Ultrasonic scalpel with longitudinal composite amplitude transformer and design method thereof |
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