CN216854788U - Ultrasonic operation cutter bar - Google Patents
Ultrasonic operation cutter bar Download PDFInfo
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- CN216854788U CN216854788U CN202123170101.8U CN202123170101U CN216854788U CN 216854788 U CN216854788 U CN 216854788U CN 202123170101 U CN202123170101 U CN 202123170101U CN 216854788 U CN216854788 U CN 216854788U
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Abstract
The utility model discloses an ultrasonic surgical cutter bar which comprises a front amplitude control area, a stress control area, a rear amplitude control area and a cutter head cutting area. The whole stress is reduced and the safety of the ultrasonic scalpel is improved under the condition that the amplitude of the hardened structure arranged in the stress control area is basically not influenced. Wherein the length L of the hardened structure0(= a ×) λ/2, wherein: a is 0.4-0.6, and lambda is the cutter bar sound wave length; diameter D of the hardened structure1Or hardness H1Are all larger than the diameter D of the non-hardened structure0Or hardness H0Wherein the diameter D1=(1.1~1.3)D0Hardness H1=(1.5~2.0)H0. The utility model has the advantages of simple design,Low processing cost, large amplitude, high safety and the like, and is very suitable for being applied to an ultrasonic scalpel.
Description
Technical Field
The utility model relates to the technical field of ultrasonic scalpels, in particular to a high-amplitude low-stress ultrasonic scalpel bar.
Background
The ultrasonic knife operation has the advantages of high precision, small wound, good blood coagulation and operation timeThe surgical instrument has the advantages of short time, quick postoperative recovery and the like, brings great benefits to doctors and patients, and has been successfully applied to many surgical fields, such as gastrointestinal surgery, hepatobiliary surgery, general surgery, obstetrics and gynecology, urology and the like. The ultrasonic scalpel system mainly comprises an ultrasonic generator, an energy converter, an amplitude transformer, an ultrasonic scalpel bar, a scalpel head and the like. The vibration (mechanical wave) generated by the transducer is transmitted to the cutter head through the cutter rod, the cutter head is contacted with the tissue, the tissue is cut by means of mechanical impact, and coagulation hemostasis is realized along with heat generation. The frequency of the ultrasonic scalpel is 55-60 kHz when in work, the output amplitude is about 50-100 mu m, namely 2 multiplied by 10 is experienced every hour of work8And (5) secondary vibration. Although the vibration displacement is relatively small, the ultrasonic operation cutter bar can experience ultrahigh cycle load circulation in a short time, and fatigue damage is easily generated at certain positions of the cutter bar with larger stress, so that fracture accidents are caused. The search for optimizing the structure of the ultrasonic scalpel, reducing the overall stress of the ultrasonic scalpel, improving the safety of the ultrasonic scalpel and prolonging the service life of the ultrasonic scalpel is always the direction of effort of technicians in the field.
Patent document 1 (publication No. CN 211213385U) provides a longitudinal texture on the ultrasonic energy output end to offset a part of the force applied to the cross section of the cutter bar, thereby reducing the possibility of breakage of the cutter bar and improving the safety of the operation. Patent document 2 (publication No. CN 213310126U) improves the diameter of each segment of the tool holder according to a specific formula, in which the tool holder changes in response to a periodic change in the axial transmission of stress during vibration, the tool holder has the largest diameter at the position where the stress is maximized, and the tool holder has the smallest diameter at the position where the stress is zero. However, the structure disclosed in the above patent document is not only relatively complicated to process, but also cannot secure the amplitude.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the defects in the prior art, provides the ultrasonic operation cutter bar with high amplitude and low stress, sets the hardening structure in the stress peak region to offset the stress based on the standing wave field, has the characteristics of simple design, low processing cost, no influence on amplitude, high safety and the like, and overcomes the defects of the process.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the utility model relates to an ultrasonic surgical cutter bar with high amplitude and low stress, which is characterized by comprising a front amplitude control area, a stress control area, a rear amplitude control area and a cutter head cutting area.
The input end of the stress control area is connected with the front amplitude control area, and the output end of the stress control area is connected with the rear amplitude control area;
length L of the stress control region1=N1λ/2, wherein: n is a radical of1Is a positive integer, and lambda is the cutter bar sound wave length;
the stress control zone comprises a plurality of hardened structures and unhardened structures, the length L of the hardened structures0(= a ×) λ/2, wherein: a is 0.4 to 0.6; the node of the stress control region is located within the range of the hardened structure;
diameter D of the hardened structure1Larger than the diameter D of the non-hardened structure0Or the hardness H of the hardened structure1Greater than the non-hardened structure hardness H0Or the diameter D of the hardened structure1And hardness H1Are all larger than the diameter D of the non-hardened structure0And hardness H0Wherein the diameter D1=(1.1~1.3)D0Hardness H1=(1.5~2.0)H0。
As a preferred scheme, the stress control area is composed of cylinders with different diameters, the cylinders with different diameters are in transition through a fillet, and the radius of the fillet is 0.05-0.1 mm.
Preferably, the input end of the front amplitude control area is connected with the ultrasonic transducer, the output end of the front amplitude control area is used for being connected with the stress control area, and the front amplitude control area comprises a threaded hole and is connected with the ultrasonic transducer through a screw.
Preferably, the front amplitude control region comprises cylinders of different diameters, and the length L of the front amplitude control region2=N2λ/2, wherein: n is a radical of2Is a positive integer; the diameter of the cylinder is 4-8 mm, the cylinders with different diameters are in transition through round corners, and the radius of each round corner is 0.05-0.1 mm.
Preferably, the amplitude increase multiple of the front amplitude control area is 1.5-3 times;
preferably, the input end of the rear amplitude control area is connected with the stress control area, and the output end of the rear amplitude control area is connected with the cutter head cutting area.
Preferably, the rear amplitude control zone comprises cylinders of different diameters, and the length L of the rear amplitude control zone3=N3λ/2, wherein: n is a radical of3Is a positive integer; the diameter of the cylinder is 3-6 mm, the cylinders with different diameters are in transition through round corners, and the radius of each round corner is 0.05-0.1 mm.
Preferably, the amplitude increase multiple of the rear amplitude control area is 1.5-3 times.
Preferably, the cutting area of the tool bit is wedge-shaped or flat sheet-shaped, the input end of the cutting area of the tool bit is connected with the rear amplitude control area, and the length L of the cutting area of the tool bit is equal to that of the rear amplitude control area4=N4λ/2, wherein: n is a radical of4Is a positive integer.
Preferably, the ultrasonic surgical blade has a length of any one of 180mm, 270mm and 405 mm.
Wherein, the input end refers to a near end, and the output end refers to a far end; the distal and proximal ends are relative to the user of the ultrasonic blade, with the end distal from the operator being the distal end and the end proximal to the operator being the proximal end.
Principles and advantages
As the acoustic wave propagates through the medium, a reflected wave and a transmitted wave are generated at the interface. Standing waves are formed when incident and reflected waves interfere with each other in a medium. The standing wave is a wave formed by incident and reflected waves having the same amplitude, the same frequency, and the same vibration direction, propagating in opposite directions on the same straight line, and overlapping.
The wave equation of the incident wave is:
the wave equation of the reflected wave is:
where A is amplitude, w is angular frequency, t is time, k is wave number, and x is mass point at a certain position. The wave equation reflects the displacement of each particle from its respective equilibrium position at some point in the wave.
The two waves are superposed with each other, and the resultant wave, i.e. standing wave, is:
. Therefore, the amplitude Am =2Acoskx of the standing wave, and it can be seen that the amplitude of the standing wave is position-dependent and vibration time-independent.
When the amplitude is maximum, the position x satisfies
I.e. kx =2 pi x/λ n pi, then x = n x λ/2 (n 0, ± 1, ± 2, …). These locations are called antinodes.
When the amplitude is minimum, the position x satisfies
That is, kx =2 π x/λ ═ n +1/2 (π), x = (2 n + 1) × 4 (n ═ 0, ± 1, ± 2, …). These locations are called nodes.
For the ultrasonic blade holder, the final amplitude magnification is mainly determined by the front amplitude control zone and the back amplitude control zone. In the two amplitude control regions, firstly, the total length of the control region is controlled to be integral multiple of half wavelength, the output end of the control region is ensured to be an antinode, and secondly, at least one transition step with the diameter being changed from large to small (from large to small from the near end to the far end) is arranged at the node of the control region to provide amplitude gain (the transition step is a gain step). The high amplitude can ensure that the ultrasonic cutter bar has good cutting effect, but the phenomenon of stress concentration can be inevitably generated at certain positions, fatigue damage is easily generated, and the regions with larger stress are mainly at the positions of nodes. The method is characterized in that the node position of the stress control area is arranged in the range of the hardening structure, the length of the hardening structure is optimized to be 0.4-0.6 times of half wavelength, the stress is offset, the phenomenon of stress concentration is weakened as much as possible, the cutter bar fracture caused by overlarge stress is avoided, the effect of strengthening the cutter bar is achieved, the hardening structure is processed into at least one of diameter increase and/or hardness increase, any one of polishing, shot blasting and coating can be adopted in the method for increasing the hardness, and after the diameter increase or the hardness increase, the same acting force is applied, the stress applied at the position is reduced, the stress control area can ensure that the amplitude of the ultrasonic wave is not attenuated and amplified basically in the process of the propagation of the cutter bar through the optimized arrangement of the hardened structures, meanwhile, the overall stress of the ultrasonic scalpel is reduced, the safety of the ultrasonic scalpel is improved, and the service life of the ultrasonic scalpel is prolonged. So, supersound cutter arbor provides great first amplitude gain through preceding amplitude control district, keeps amplitude gain basically not taking place decay and enlargies through stress control district, reduces whole stress simultaneously, and amplitude control district provides great secondary amplitude gain behind the rethread to finally can provide great amplitude and cutting speed for the tool bit, and can guarantee that the use does not take place the cracked condition of cutter arbor, improve the security.
Drawings
Fig. 1 is a schematic structural view of a conventional ultrasonic scalpel.
Fig. 2 is a schematic structural view of the ultrasonic scalpel of the present invention.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and are not limiting of the utility model. It should be noted that, for convenience of description, only the relevant portions of the related inventions are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
FIG. 1 shows a schematic structural view of one embodiment of a prior art ultrasonic surgical blade. The length of the existing ultrasonic surgical knife rod is 270 mm.
Fig. 2 shows a schematic structural view of one embodiment of the ultrasonic surgical blade holder of the present application. The length of the ultrasonic surgical knife rod is 270mm, and the ultrasonic surgical knife rod comprises a front amplitude control area 1, a stress control area 2, a rear amplitude control area 3 and a knife head cutting area 4 which are sequentially connected.
The output end of the front amplitude control area 1 is connected with the stress control area 2, the output end of the stress control area 2 is connected with the rear amplitude control area 3, the output end of the rear amplitude control area 3 is connected with the cutter head cutting area 4, and all the joints are in fillet transition, wherein the radius of each fillet is 0.1 mm.
Length L of front amplitude control zone 12Is 45mm and comprises two cylinders with different diameters, the diameters are respectively 6mm and 4mm, the two cylinders are transited by a fillet, and the radius of the fillet is 0.05 mm.
The front amplitude control region 1 includes a threaded hole 11 and is connected to the ultrasonic transducer by a screw.
The length L of the stress control zone 21135mm, consisting of 3 hardened structures 21 and 6 unhardened structures 22, the length L of the 3 hardened structures 21018, 20 and 27mm, respectively, diameter D of 3 hardened structures14.8mm, 4mm and 4.4mm, respectively, hardness H of 3 hardened structures1300HV, 450HV and 300HV, respectively. Diameter D of 6 non-hardened structures 220And hardness H0Both 4mm and 300 HV. The portions of the 3 hardened structures having greater hardness are obtained by shot peening.
The cylinders in the stress control zone 2 are transitioned through a fillet with a fillet radius of 0.08 mm.
Length L of the rear amplitude control zone 33Is 45mm and comprises two cylinders with different diameters, the diameters are respectively 4mm and 3mm, the two cylinders are transited by a fillet, and the radius of the fillet is 0.05 mm.
The cutting zone 4 of the cutting head is in the form of a flat sheet with a length L4Is 45 mm.
This application supersound cutter arbor provides great first amplitude gain through preceding amplitude control district, theoretical amplitude increase multiple is 2.25 times (the ratio of two cylinder sectional area squares), keep amplitude gain not to take place decay and enlargeing basically through the stress control district, and set up 3 sclerosis structures, harden the structure including 2 diameters increase and 1 hardness increase reduces whole stress, amplitude control district provides great secondary amplitude gain behind the rethread, theoretical amplitude increase multiple is 1.69 times, thereby finally can provide great amplitude and cutting speed for the tool bit, and can guarantee that the cracked condition of cutter arbor does not take place for the use, and the security is improved.
Table 1 shows the amplitude and stress at 55KH for the conventional ultrasonic surgical blade and the ultrasonic surgical blade of the present invention. Through the comparison discovery, can see that the output amplitude of the cutter arbor structure of this application compares the amplitude of prior art's scalpel cutter arbor slightly high, but the maximum stress and the average stress compare the reduction by a wide margin of prior art's scalpel cutter arbor, and the amplitude of during operation cutter arbor is not only not influenced, improves the security moreover, the probability greatly reduced who breaks down.
TABLE 1 amplitude and stress results comparison
| Output amplitude um | Maximum stress MPa | Mean stress MPa | |
| Prior Art | 48 | 360 | 320 |
| The utility model | 49 | 285 | 254 |
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the utility model herein disclosed is not limited to the particular combination of features described above, but also encompasses other arrangements formed by any combination of features described above or equivalents thereof without departing from the spirit of the utility model. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (10)
1. An ultrasonic surgical knife bar is characterized by comprising a front amplitude control area (1), a stress control area (2), a rear amplitude control area (3) and a knife head cutting area (4);
the input end of the stress control area (2) is connected with the front amplitude control area (1), and the output end of the stress control area is connected with the rear amplitude control area (3);
length L of the stress control zone1=N1λ/2, wherein: n is a radical of1Is a positive integer, and lambda is the cutter bar sound wave length;
the stress control zone (2) comprises a plurality of hardened structures (21) and a plurality of non-hardened structures (22), the length L of the hardened structures0(= a ×) λ/2, wherein: a is 0.4 to 0.6; the node of the stress control zone (2) is located within the range of the hardened structure (21);
the diameter D of the hardened structure (21)1Is larger than the diameter D of the non-hardened structure (22)0Or the hardness H of the hardened structure (21)1Greater than the non-hardened structure (22) hardness H0Or the diameter D of the hardened structure (21)1And hardness H1Are all larger than the diameter D of the non-hardened structure (22)0And hardness H0Wherein the diameter D1=(1.1~1.3)D0Hardness H1=(1.5~2.0)H0。
2. The ultrasonic surgical blade bar of claim 1, wherein: stress control district (2) comprises the cylinder of different diameters, the cylinder of different diameters passes through the fillet transition, and fillet radius is 0.05~0.1 mm.
3. The ultrasonic surgical blade bar of claim 1, wherein: the input end of the front amplitude control area (1) is used for being connected with an ultrasonic transducer, the output end of the front amplitude control area is connected with the stress control area (2), and the front amplitude control area (1) comprises a threaded hole (11) and is connected with the ultrasonic transducer through a screw.
4. The ultrasonic surgical blade holder of claim 1, wherein: the front amplitude control region (1) comprises cylinders with different diameters, and the length L of the front amplitude control region (1)2=N2λ/2, wherein: n is a radical of hydrogen2Is a positive integer; the diameter of the cylinder is 4-8 mm, the cylinders with different diameters are in transition through round corners, and the radius of each round corner is 0.05-0.1 mm.
5. The ultrasonic surgical blade bar of claim 1, wherein: the amplitude increase multiple of the front amplitude control area (1) is 1.5-3 times.
6. The ultrasonic surgical blade bar of claim 1, wherein: the input end of the rear amplitude control area (3) is connected with the stress control area (2), and the output end of the rear amplitude control area is connected with the cutter head cutting area (4).
7. The ultrasonic surgical blade bar of claim 1, wherein: the rear amplitude control zone (3) comprises cylinders of different diameters, the length L of the rear amplitude control zone (3)3=N3λ/2, wherein: n is a radical of3Is a positive integer; the diameter of the cylinder is 3-6 mm, the cylinders with different diameters are in transition through round corners, and the radius of each round corner is 0.05-0.1 mm.
8. The ultrasonic surgical blade bar of claim 1, wherein: the amplitude increase multiple of the rear amplitude control area (3) is 1.5-3 times.
9. The ultrasonic surgical blade bar of claim 1, wherein: the tool bit cutting area (4) is wedge-shaped or flat sheet-shaped, the input end of the tool bit cutting area (4) is connected with the rear amplitude control area (3), and the length L of the tool bit cutting area (4)4=N4*λ(ii)/2, wherein: n is a radical of4Is a positive integer.
10. The ultrasonic surgical blade bar of claim 1, wherein: the length of the ultrasonic surgical knife rod is any one of 180mm, 270mm and 405 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123170101.8U CN216854788U (en) | 2021-12-16 | 2021-12-16 | Ultrasonic operation cutter bar |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123170101.8U CN216854788U (en) | 2021-12-16 | 2021-12-16 | Ultrasonic operation cutter bar |
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| CN216854788U true CN216854788U (en) | 2022-07-01 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115869046A (en) * | 2023-03-08 | 2023-03-31 | 杭州康基医疗器械有限公司 | Center rod of miniature open ultrasonic scalpel |
| CN117159096A (en) * | 2023-08-17 | 2023-12-05 | 哈尔滨理工大学 | Multistage type stress weakening ultrasonic scalpel cutter bar |
-
2021
- 2021-12-16 CN CN202123170101.8U patent/CN216854788U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115869046A (en) * | 2023-03-08 | 2023-03-31 | 杭州康基医疗器械有限公司 | Center rod of miniature open ultrasonic scalpel |
| CN117159096A (en) * | 2023-08-17 | 2023-12-05 | 哈尔滨理工大学 | Multistage type stress weakening ultrasonic scalpel cutter bar |
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