CN110811770B - Ultrasonic knife conduction rod and ultrasonic knife - Google Patents
Ultrasonic knife conduction rod and ultrasonic knife Download PDFInfo
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- CN110811770B CN110811770B CN201810920954.2A CN201810920954A CN110811770B CN 110811770 B CN110811770 B CN 110811770B CN 201810920954 A CN201810920954 A CN 201810920954A CN 110811770 B CN110811770 B CN 110811770B
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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
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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
- A61B2017/320069—Surgical cutting instruments using mechanical vibrations, e.g. ultrasonic for ablating tissue
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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
- A61B2017/320072—Working tips with special features, e.g. extending parts
- A61B2017/320074—Working tips with special features, e.g. extending parts blade
- A61B2017/320075—Working tips with special features, e.g. extending parts blade single edge blade, e.g. for cutting
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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
- A61B2017/320082—Surgical cutting instruments using mechanical vibrations, e.g. ultrasonic for incising tissue
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Abstract
The invention discloses an ultrasonic knife conducting rod and an ultrasonic knife, wherein the conducting rod comprises a near part rod body, a middle part rod body and a far part rod body which are sequentially connected, one end of the near part rod body is connected with an ultrasonic transducer, the other end of the near part rod body is connected with the middle part rod body, one end of the far part rod body is connected with the middle part rod body, the other end of the far part rod body is connected with a knife head, and sound waves are transmitted from one end of the near part rod body connected with the ultrasonic transducer; the outer surface of the near rod body is provided with a convex structure along the circumferential direction; the outer surface of the middle rod body and/or the far rod body is/are provided with a gain step along the circumferential direction; the ultrasonic blade comprises the conducting rod. Compared with the prior art, the ultrasonic knife can obviously improve the phase tolerance and amplitude of resonance, reduce the energy loss of sound waves, and has smaller impedance of the conducting rod, so that the ultrasonic knife has more stable working state and higher-efficiency output.
Description
Technical Field
The invention relates to the technical field of ultrasonic scalpels, in particular to an ultrasonic scalpel conduction rod and an ultrasonic scalpel.
Background
An ultrasonic scalpel (i.e., an ultrasonic scalpel) is a novel surgical instrument, which has significant advantages over conventional electric scalpels, such as precise cutting, hemostasis, less thermal damage, short operation time, application to vital organs, less smoke and charring, clear visual field during operation, no current flow through the body, and capability of cutting any substantial tissue other than bone tissue. As ultrasonic blades are used more and more, the performance requirements for ultrasonic blades are also higher and higher.
The resonance characteristics of the ultrasonic blade vibration system specifically include resonance frequency, resonance impedance and resonance amplitude, which directly determine the working state of the ultrasonic blade and affect the electroacoustic conversion efficiency of the ultrasonic blade. In general, the larger the spacing (i.e., the frequency width) between the series resonance point (Fs) and the parallel resonance point (Fp) of the ultrasonic-blade vibration system, the better the resonance characteristics of the ultrasonic vibration system. The resonant amplitude, impedance and the like of the ultrasonic blade are determined by the blade structure, particularly the arrangement and distribution of gain steps, and the frequency characteristics of the ultrasonic blade are influenced.
More specifically, in the prior art, the phase margin of the tool holder operation is substantially within 80Hz, which is not sufficient to maintain a good resonance condition of the tool holder at all times in a complex operating environment. The fundamental reason for this narrow tolerance in view of the existing solutions is the structural design of the conducting part of the ultrasonic blade shaft. FIG. 1 illustrates a prior art ultrasonic blade. As shown in fig. 1, the conductive rod portion of the prior art ultrasonic blade provides a gain step at the proximal first half-wavelength node of the blade shaft, which is further from the blade tip. The gain step is arranged at the half-wavelength node, so that the vibration amplitude of ultrasonic waves input by the cutter bar is increased, the larger the vibration amplitude is, the larger the friction between sound waves and the inside of a solid medium in the propagation process is, the more obvious the energy loss of the sound waves is, the instability of sound wave conduction is caused, and the phase tolerance of resonance is sacrificed. Therefore, how to effectively optimize the structure of the ultrasonic blade conducting rod to improve the phase tolerance of resonance and reduce the energy loss of sound wave has become a key point for those skilled in the art to solve and research.
Disclosure of Invention
In order to solve the above problems, the present invention proposes a technical solution, which discards the existing structure in which a gain step is provided at a first half-wavelength node at a proximal end of a knife bar, and introduces a convex type enhancing structure (hereinafter may be referred to as "convex structure") called "bamboo joint" in an image at the first half-wavelength node, and provides gain steps with different gain ratios at different positions in a knife bar axial direction, so that the ultrasonic knife of the present invention has better frequency characteristics, impedance characteristics, and amplitude characteristics, thereby improving a phase margin of knife bar resonance of the ultrasonic knife of the present invention, reducing acoustic wave loss, improving an electric energy-acoustic energy conversion ratio, enhancing the knife bar strength of the ultrasonic knife, making the ultrasonic knife have a more stable working state, and improving the working efficiency of the ultrasonic knife as a whole.
According to an embodiment of the present invention, there is provided an ultrasonic blade conducting rod, which includes a proximal rod body, a middle rod body and a distal rod body connected in sequence, wherein one end of the proximal rod body is connected to an ultrasonic transducer, the other end of the proximal rod body is connected to the middle rod body, one end of the distal rod body is connected to the middle rod body, the other end of the distal rod body is connected to a cutter head, and sound waves are transmitted from one end of the proximal rod body connected to the ultrasonic transducer; the outer surface of the near rod body is circumferentially provided with a convex structure, and the convex structure is positioned in the length range of the first half wavelength transmitted by sound waves in the axial direction; and the outer surface of the middle rod body and/or the far rod body is/are provided with a gain step along the circumferential direction.
Based on the technical scheme, through the double design of the convex structure and the gain step, the ultrasonic knife conducting rod provided by the invention has the advantages of larger phase tolerance, larger amplitude, smaller impedance, more stable working state, higher output efficiency and the like; in addition, the protruding structure can also play the effect of strengthening local intensity, supporting the conduction pole, extension conduction pole to satisfy the work needs of complex environment.
Further, the geometric center of the raised structure is at the node of the first half wavelength of the incoming sound wave.
In the embodiment of the present invention, the protruding structure may be a regular structure or an irregular structure. Specifically, in the embodiment of the present invention, the protruding structure may be provided in a regular cylindrical shape or a circular truncated cone shape, and the protruding structure is integrally formed with the proximal rod body. Thereby the local intensity of the cutter arbor is strengthened to reduce the amplitude of input ultrasonic wave, locally reduced the energy loss of incoming sound wave, and increased conduction pole length, enlarged the operation scope, improved surgical instruments's flexibility.
In an embodiment of the invention, the ratio of the distance from the end of the convex structure on the side close to the tool tip to the end of the first half-wavelength to the half-wavelength is more than 0.4 and less than 0.6.
Thus, the embodiments of the present invention can maximally improve the phase margin and amplitude and maximally reduce the impedance, and can achieve an increase in the conductive rod length by 0.5mm to 2mm.
In an embodiment of the present invention, the gain step provided in the circumferential direction at the outer surface of the distal rod body may be a double-layer gain step. This double-deck gain step includes first step portion and second step portion, and from the tool bit to the body of rod direction of distal portion, first step portion, second step portion set gradually, and distal portion body of rod diameter is less than first step portion diameter, and first step portion diameter is less than second step portion diameter.
In the embodiment of the invention, the design of the double-layer gain step is carried out on the far rod body, so that the requirements of the vibration amplitude of the cutter head and the working strength of the conducting rod can be considered, for example, before ultrasonic waves reach the cutter head, the ultrasonic amplitude can be effectively and slowly amplified, the problem of overlarge local stress can be well alleviated through the double-layer gain step, the maximum stress of the cutter head is reduced from a thinner area of the cutter head, and the service life of the cutter head is prolonged.
In an embodiment of the present invention, a ratio of the diameter D1 of the first stepped portion to the diameter D2 of the second stepped portion may be D1/D2 > 60%.
Further, the ratio of the diameter D1 of the first stepped portion to the diameter D2 of the second stepped portion may be D1/D2 > 63.5%.
Therefore, on the basis of considering the requirements of the vibration amplitude of the cutter head and the working strength of the conducting rod, the embodiment of the invention can ensure that the cutter head has reasonable sound gain and better vibration mode, and the amplitude of ultrasonic waves is effectively and reasonably increased.
In an embodiment of the present invention, in the direction of sound wave transmission, the last node on the distal rod body is located in front of the second step portion, and the distance from the last node on the distal rod body to the starting end of the second step portion is less than 5% of the half wavelength.
Therefore, the embodiment of the invention can ensure that the cutter head has enough sound amplitude, ensure that the amplitude of the ultrasonic wave transmitted to the cutter head meets the actual requirement, better realize the acoustic characteristic of the ultrasonic wave, and the final gain realized by the invention can reach more than 3.5.
In the embodiment of the invention, the ratio of the axial distance a from the starting end of the second stepped part to the starting end of the first stepped part to the axial distance b from the end of the first stepped part to the tool bit can be a/b ≧ 0.325.
Therefore, stress can be released locally in the process that the ultrasonic wave is transited from the second step part to the first step part, the stress increase of the cutter head can be gradually relieved, so that the stress of a thinner area of the cutter head is greatly reduced, the probability of damage to the cutter head is reduced, and the purpose of prolonging the service life of the cutter head is achieved; in addition, the embodiment of the invention can also ensure that the tool bit keeps a pure and clean vibration mode in a preset frequency interval.
In the embodiment of the invention, one end of the near part rod body connected with the ultrasonic transducer is provided with a threaded hole, and the threaded hole and the near part rod body have the same axial lead in the axial direction. Therefore, a cavity structure can be formed through the threaded hole, and according to the sound wave theory, the cavity structure can reduce the amplitude of input ultrasonic waves, so that the purpose of further effectively reducing sound energy loss is achieved.
In an embodiment of the present invention, the proximal rod, the middle rod and the distal rod are integrally formed.
In an embodiment of the present invention, there is also provided an ultrasonic blade including the ultrasonic-blade conducting rod described above.
In an embodiment of the present invention, the ultrasonic blade may include a blade head provided with an arc-shaped cutting blade, and the blade head may be further provided with at least one cutting surface.
In the embodiment of the invention, the distance from the first half-wavelength node of the middle rod body to the middle gain step is 13-17% of the half wavelength.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 schematically illustrates a conductive rod structure of a typical ultrasonic blade of the prior art;
FIG. 2 illustrates an exploded view of the ultrasonic blade conducting bar in its entirety according to an embodiment of the present invention;
FIG. 3 illustrates a proximal shaft and a distal shaft in accordance with an embodiment of the present invention;
FIG. 4 illustrates a schematic view of an ultrasonic blade conducting bar structure and a partially enlarged structure thereof according to an embodiment of the invention;
FIG. 5 is a schematic diagram illustrating a relationship between a diameter of a bamboo joint structure and a resonant frequency according to an embodiment of the present invention;
FIG. 6 illustrates a schematic view of the distal shaft tip and the cutting head according to an embodiment of the present invention;
FIG. 7 illustrates a schematic view of a tool tip according to an embodiment of the invention;
FIG. 8 is a schematic illustration of a disclosed distal tip amplitude displacement graph in accordance with an embodiment of the present invention; and
FIG. 9 schematically illustrates a comparison of impedance curves for an ultrasonic blade as disclosed in embodiments of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention.
The same or similar numbered elements/components used in the drawings and the embodiments are used to represent the same or similar parts. And the drawings are merely schematic, the elements of which are not necessarily to scale.
Fig. 2 illustrates an exploded structural view of the entirety of an ultrasonic-blade conducting bar according to an embodiment of the present invention. As shown in fig. 2, the conducting rod of the ultrasonic scalpel of the embodiment of the present invention includes a proximal rod 1, a middle rod 2, and a distal rod 3, which are connected in sequence, wherein one end of the proximal rod 1 is connected to an ultrasonic transducer, and the other end is connected to the middle rod 2, one end of the distal rod 3 is connected to the middle rod 2, and the other end is connected to a scalpel head, and sound waves are transmitted from one end of the proximal rod 1 connected to the ultrasonic transducer; the outer surface of the near rod body 1 is circumferentially provided with a convex structure 10, and in the axial direction, the convex structure 10 is positioned in the length range of the first half wavelength transmitted by sound waves; the outer surface of the central shaft 2 and/or the distal shaft 3 is provided with a gain step 20 and/or 30 in the circumferential direction.
For the sake of simplicity, the reference to "proximal" and "distal" in the embodiments of the present invention is relative to the holder of the ultrasonic scalpel, where the proximal shaft 1 is closest to the holder and the distal shaft 3 is farthest from the holder, and the relative positions of the proximal shaft and the distal shaft with respect to the holder and the scalpel head will not be described in detail below.
In an embodiment of the present invention, preferably, for the whole ultrasonic blade transmission rod, the proximal rod body 1 according to this embodiment may be a region of about 1.5 wavelength length of the first ultrasonic wave transmitted, the middle rod body 2 may be a region of about 1 wavelength length from the connection point with the proximal rod body 1, and the rest may be the distal rod body 3. By optimizing the acoustic characteristics of the near rod body, the middle rod body and the far rod body, the better resonance characteristic of the cutter head is realized, and the effects of high output and low energy consumption are achieved.
In an embodiment of the present invention, the proximal rod 1, the middle rod 2, and the distal rod 3 may be integrally formed.
In order to ensure proper ultrasonic frequency, a convex structure 10 may be provided on the outer surface of the proximal rod body 1 along the circumferential direction to match the input ultrasonic frequency, thereby also playing a role in enhancing local strength and support. In the embodiment of the present invention, the protrusion structure may be a regular structure or an irregular structure.
The "arrows" in fig. 4 are used to point from the circle to the enlarged front portion to the enlarged rear portion. As shown in fig. 3 and 4, in the embodiment of the present invention, the protruding structure 10 may be cylindrical or truncated cone, and the diameter of the protruding structure 10 is larger than that of the proximal rod body 1. Thereby enhancing the local strength of the cutter bar and reducing the amplitude of the input ultrasonic wave.
In an embodiment of the invention, the raised structure 10 is in the length range of the first half wavelength of the incoming sound wave in the axial direction.
In an embodiment of the invention, the geometric center of the raised structure (10) may be near the node of the first half wavelength of the incoming sound wave. Whereas the proximal shaft body 1 (excluding the raised structure) may have a uniform cross-sectional radius over the length of the first half wavelength (or "first half wavelength").
In this embodiment, the protrusion structure 10 and the proximal rod body 1 can be integrally formed.
In the embodiment of the present invention, the two ends of the protrusion structure 10 can be connected with the proximal shaft body 1 in a smooth transition manner.
Since the conductive rod is a multi-wavelength structure, the wave will accompany the dissipation of acoustic energy during propagation. In order to reduce the dissipation of the sound energy as much as possible, the amplitude of the ultrasonic wave just transmitted into the conducting rod can be reduced by adjusting the width and the position of the convex structure 10, so that the effect of reducing the dissipation of the sound energy is achieved. The amplitude of the vibration can be amplified or reduced by appropriately adjusting the position of the projection structure 10.
In the embodiment of the present invention, the vibration amplitude is reduced by setting the relationship between the distance d from the tip of the convex structure 10 on the side close to the tool tip to the tip of the first half wavelength and the first half wavelength L. In addition, the convex structure 10 strengthens local strength, and plays a supporting role for the rod body, thereby further increasing the overall strength of the ultrasonic scalpel.
In the embodiment of the present invention, in order to achieve a more preferable resonance state, the ratio of the distance d from the end of the convex structure 10 to the end of the first half wavelength to the first half wavelength L may be more than 0.4 and less than 0.6 (i.e., 0.4-straw d/L < 0.6).
Fig. 5 illustrates a schematic diagram of a relationship between the diameter of the bamboo joint structure and the resonant frequency in the embodiment of the present invention. As shown in fig. 5, in the embodiment of the present invention, the diameter of the convex structure 10 is increased step by step, so that the frequency of the tool bar increases with the increase of the diameter, and the change relationship is almost a straight line. According to the characteristic, the ultrasonic frequency can be adjusted under the condition that the diameter of the bamboo joint structure is properly adjusted, so that the effective length of the cutter bar can be increased.
Generally, a wave will accompany dissipation of acoustic energy during propagation, with longer wavelengths and lower frequencies. In the embodiment of the invention, the ultrasonic frequency is adjusted or increased by introducing the bamboo joint structure, so that the barrier is overcome, and the effective length of the cutter bar is increased.
For a specific material, the structure has constant mechanical physical quantities such as young's modulus E and density ρ, and if the structure is regular, such as a pure bar, the resonant frequency f of the structure can be expressed as:
f = (sqrt (E/ρ))/2 × L, where L is the length of the rod.
Although conventional acoustically conductive rods are irregularly structured in order to meet both acoustic and mechanical requirements. However, for a particular length type of ultrasonic blade, within this framework, it can be seen from the above that the length of the blade can be increased appropriately while maintaining the ultrasonic blade frequency in a better resonance state. This can greatly improve the flexibility of the surgery for the surgery. For example, for a 36cm type knife bar, the resonance length is about 404mm, after the bamboo joint structure of the embodiment of the invention is introduced, the length of the knife bar can be increased by 0.5 to 2mm, which has a wider operation range and better operation effect in the surgical operation.
As shown in fig. 3, in the embodiment of the present invention, a threaded hole 11 is formed at one end of the proximal rod body 1 connected to the ultrasonic transducer, the threaded hole 11 and the proximal rod body 1 have the same axial lead in the axial direction, and by designing the threaded hole 11, the embodiment of the present invention generates a cavity structure at the first quarter wavelength within the first half wavelength range of the incoming sound wave, and according to the sound wave theory, the cavity structure has a gain effect and the gain is smaller than 1 (even if the amplitude of the sound wave is reduced), so that the present invention can moderate and reduce the amplitude of the input sound wave, thereby achieving the purpose of reducing the sound energy loss.
In the embodiment of the invention, the outer surface of the far rod body and/or the middle rod body can be provided with the gain steps along the circumferential direction to amplify the amplitude of the ultrasonic waves, so that the vibration effect is enhanced, and more effective amplitude output is provided for the cutter head.
For a free vibration system, the vibration characteristic equation is as follows:
([K]-ω 2 [M]){U 0 }＝{0}
wherein [ K ]]Represents the stiffness matrix of the system, [ M ]]Representing the system quality matrix, U 0 Representing the vibration displacement of the system and omega representing the vibration circular frequency of the system. For the vibration system of the embodiment of the invention, the materials of all parts are known, and meanwhile, the target structure frequency ω is also known, so that the system mass matrix needs to be adjusted to find out the corresponding vibration displacement distribution, namely the vibration mode. The amplitude gain effect of the conducting rod (cutter bar) is mainly determined by the mass ratio before and after the node, and the following expression represents the relationship between the mass before and after the node and the gain ratio:
∫M 1 *Vel 1 *dx＝∫M 2 *Vel 2 *dx (1)
∫M 1 *2πf*AMP 1 *dx＝∫M 2 *2πf*AMP 2 *Vel 2 *dx (2)
wherein M is 1 、M 2 The masses before and after the node, vel respectively 1 、Vel 2 Velocity vectors before and after the node, respectively, and AMP 1 、AMP 2 The amplitudes of the input end and the output end are respectively equal according to the same medium density, so that the gain ratio gain can be equivalent to:
gain＝M 1 /M 2 ＝AMP 2 /AMP 1 (3)
as shown in fig. 2, in the embodiment of the present invention, the distal rod body 3 may be provided with a gain step 30, which amplifies the amplitude of the ultrasonic wave, thereby enhancing the vibration effect and providing a more effective amplitude output to the cutter head. As shown in the above expressions (1) to (3), by adjusting the position of the gain step 30, the gain thereof can be changed.
As shown in fig. 3 and 4, in order to achieve a better vibration effect of the entire ultrasonic blade and alleviate the problem of excessive local stress of the shaft caused by the introduction of the gain step, the gain step 30 may be a double-layer gain step, and includes a first step 300 and a second step 301, and the first step 300 and the second step 301 are sequentially arranged in the direction from the blade to the distal shaft body 3. The distal shaft 3 diameter may be smaller than the first step 300 diameter, and the first step 300 diameter may be smaller than the second step 301 diameter. In the embodiment of the invention, the requirement on the vibration amplitude can be met through the structure of the double-layer gain step, and the requirement on the working strength of the cutter bar can also be met, so that the effect of slowly increasing the amplitude is achieved, and the requirement on the mechanical strength can also be ensured.
In the embodiment of the present invention, in order to obtain a reasonable acoustic gain, the ratio of the diameter D1 of the first step 300 to the diameter D2 of the second step 301 may be D1/D2 > 60%. Preferably, the ratio may be D1/D2 > 63.5%.
In the embodiment of the present invention, in the direction of sound wave transmission, i.e., the proximal rod 1, the middle rod 2, and the distal rod 3 are arranged in sequence from front to back, in order to better realize the acoustic characteristics thereof and ensure sufficient sound amplitude, the last node (the node at the farthest side) on the distal rod 3 is located in front of the second step 301, i.e., away from the tool tip.
In the embodiment of the present invention, for better mode shape, the distance from the last node on the distal rod 3 to the starting end of the second step portion 301 is less than 5% of half wavelength.
Generally speaking, the most dangerous region of an ultrasonic scalpel is at the abrupt bend of the blade tip, where the stress is greater due to the abrupt bend of the structure, which is also a relatively thin region. In the embodiment of the invention, after the double-layer gain step is introduced, the stress increase of the cutter head can be gradually relieved, and the stress is locally released when the double-layer gain step is transited from the female step (the second step part) to the sub step (the first step part), so that the stress at the bent part of the cutter head is transferred to a place with a larger size, and the bent abrupt change part is no longer the maximum stress part, therefore, the local stress of the cutter head is reduced, and the service life of the bent cutter head is prolonged. In the embodiment of the invention, in order to ensure the gain and the mode shape, the ratio of the axial distance a from the starting end of the second stepped part 301 to the starting end of the first stepped part 300 to the axial distance b from the end of the first stepped part 300 to the tool bit can be a/b ≧ 0.325, so that the tool bit can obtain larger amplitude in a mode with better mode shape. According to the embodiment of the invention, the vibration displacement cloud chart of the tool bit shows that the displacement distribution is very uniform, and the final gain of the tool bit is more than 3.5.
In the embodiment of the invention, in order to enable the whole ultrasonic scalpel to achieve a better vibration effect, a composite structure of a gain step and a conical structure can be arranged on the far rod body. In the embodiment of the present invention, a tapered structure may be further provided on the front side (the side away from the tool bit) of the gain step 30, and the node may be located within the position range of the tapered structure. By introducing the conical structure into the embodiment of the invention, the amplitude of the cutter tip is slowly increased, a local buffering effect is achieved, the vibration uniformity of the cutter tip is coordinated, and the working strength of the cutter head is enhanced to a certain extent. By adjusting the diameter of the input face and the diameter of the output face of the conical structure, the amplitude of the tip of the tool bit and the output of the associated resonant characteristics can be effectively controlled. For example, the amplitude of the tool nose can be reduced by increasing the diameter of the input surface, the amplitude output of the tool tip can be amplified by reducing the diameter of the output surface, and the relationship between the two is controlled to achieve better resonance characteristic output such as amplitude.
In embodiments of the invention, the ratio of the diameter of the input face to the diameter of the output face of the tapered structure may be greater than 0.9. Preferably, in an embodiment of the present invention, the ratio of the diameter of the input face to the output face of the tapered structure may be greater than 0.9 and less than 1.
In the embodiment of the present invention, as shown in fig. 2, to perform amplification and structural reinforcement, a gain step 20 may be provided on the outer surface of the middle rod body 2 along the circumferential direction. Based on the principle similar to the above, in the embodiment of the present invention, the first node of the ultrasonic wave entering the middle rod body may be located at the front side of the gain step, and the effect of better vibration mode is achieved by adjusting the position of the node and further the structures on the left and right sides of the node. In order to provide better vibration mode for the ultrasonic blade conducting rod, in the embodiment of the present invention, the distance from the first node of the sound wave on the central rod body 2 to the gain step on the central rod body 2 may be 10% to 20% of a half wavelength, and preferably may be 15%. In the embodiment of the invention, the gain step is arranged on the middle rod body, so that the amplitude of ultrasonic waves can be amplified, the vibration effect is enhanced, and more effective amplitude output is provided for the cutter head.
The gain step provided at the middle rod 2 may also be a double gain step based on a similar description as in the distal rod. For the sake of brevity, the structure thereof will not be described in detail herein.
In embodiments of the present invention, the gain of the gain step on the middle and/or distal shaft body of the conductive shaft may be greater than 1, such that the resonant system of the ultrasonic blade is capable of greater and more uniform amplitude output.
In embodiments of the invention, the resonant bandwidth of the conductive rod may be greater than 100Hz.
In an embodiment of the present invention, there is also provided an ultrasonic blade including the above-described conductive rod. As shown in fig. 2, the ultrasonic blade further includes a blade head 4.
In an embodiment of the invention, the cutting head is provided with an arc-shaped cutting blade. As shown in fig. 6 and 7, the cutting head 4 is provided with an arc-shaped cutting blade, at least one cutting surface 400 is provided on the cutting head 4, and an intersection line between the cutting surface 400 and the cutting surface 400 is a blade 401. The blade of the cutter head 4 is a key part for performing the operation, and in the embodiment of the invention, the cutter head has better output and better working state through optimizing the cutter bar.
Fig. 8-9 schematically illustrate the disclosed distal tip vibration displacement distribution and impedance curves of the vibration system of an embodiment of the present invention compared to the prior art, respectively.
In the above embodiment, as shown in fig. 8, the displacement of the input surface of the ultrasonic blade according to the embodiment of the present invention is preferably about 11, and the vibration displacement to the tip end of the blade reaches more than 40, and the overall gain ratio thereof reaches approximately 4, so that the tip end of the blade has a more sufficient displacement output. And the more sufficient ultrasonic vibration output enables the ultrasonic knife head of the embodiment of the invention to have better cutting hemostasis effect.
As shown in fig. 9, the impedance curve is one of the most basic and important metrics of the ultrasonic vibration system, and the basic characteristics of the ultrasonic vibration system can be almost reflected in the impedance curve. The ultrasonic vibration system of the embodiment of the invention has better impedance curve characteristics than the prior design, the frequency between the series resonance point and the parallel resonance point is wider, the bandwidth (namely the difference between the anti-resonance frequency and the resonance frequency) of the cutter bar vibration system is more than 110Hz, namely the phase margin is more than 100Hz, more than the prior design is at least 20Hz, the impedance at the series resonance point is lower, and the impedance at the parallel point is higher, which reflects that the vibration system related to the embodiment of the invention is a low-energy consumption system.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present specification, reference to the description of the terms "this embodiment," "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction. The invention relates to the 'A and/or B', which can be understood to include three cases of A, B and AB; in addition, references to "acoustic" in the present invention are to be understood as "ultrasonic" unless otherwise indicated.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the invention, and any modifications, equivalents and simple improvements made on the spirit of the present invention should be included in the scope of the present invention.
Claims (6)
1. An ultrasonic knife conduction pole which is characterized in that: the conduction rod comprises a near rod body (1), a middle rod body (2) and a far rod body (3) which are sequentially connected, one end of the near rod body (1) is connected with an ultrasonic transducer, the other end of the near rod body is connected with the middle rod body (2), one end of the far rod body (3) is connected with the middle rod body (2), the other end of the far rod body is connected with a cutter head (4), and sound waves are transmitted from one end of the near rod body (1) connected with the ultrasonic transducer; the outer surface of the near part rod body (1) is circumferentially provided with a convex structure (10), and in the axial direction, the convex structure (10) is positioned in the length range of the first half wavelength transmitted by sound waves; the ratio of the distance from the end of the convex structure (10) close to the side of the cutter head to the first half-wavelength end to the half-wavelength is more than 0.4 and less than 0.6; the outer surface of the middle rod body (2) and/or the far rod body (3) is/are provided with a gain step (20);
the gain step (30) arranged on the outer surface of the far-part rod body (3) along the circumferential direction is a double-layer gain step, the double-layer gain step comprises a first step part (300) and a second step part (301), the first step part (300) and the second step part (301) are sequentially arranged in the direction from the cutter head to the far-part rod body (3), the diameter of the far-part rod body (3) is smaller than that of the first step part (300), and the diameter of the first step part (300) is smaller than that of the second step part (301); in the direction of sound wave transmission, the last node on the far-part rod body (3) is positioned at the front side of the second step part (301), and the distance from the last node on the far-part rod body (3) to the starting end of the second step part (301) is less than 5% of half wavelength; the axial distance from the starting end of the second step part (301) to the starting end of the first step part (300) is a, the axial distance from the tail end of the first step part (300) to the cutter head is b, and a/b is more than or equal to 0.325;
a conical structure is arranged on the front side of the gain step (30), and a node is positioned in the position range of the conical structure; the ratio of the diameter of the input surface to the diameter of the output surface of the tapered structure is greater than 0.9 and less than 1.
2. The ultrasonic blade conduction bar of claim 1, wherein: the geometric center of the convex structure (10) is at the node of the first half wavelength transmitted by the sound wave.
3. The ultrasonic blade conduction bar of claim 2, wherein: the protruding structure (10) is cylindrical or round table-shaped, and the protruding structure (10) and the near rod body (1) are integrally formed.
4. The ultrasonic blade conducting bar according to claim 1, wherein the ratio D1/D2 of the diameter D1 of the first step portion (300) to the diameter D2 of the second step portion (301) is > 60%.
5. An ultrasonic blade, comprising: the ultrasonic blade includes the ultrasonic-blade-conducting rod of any one of claims 1 to 4.
6. The ultrasonic blade of claim 5, wherein: the ultrasonic knife comprises a knife head provided with an arc-shaped cutting blade point, and the knife head is provided with at least one cutting surface.
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| CN201810920954.2A CN110811770B (en) | 2018-08-14 | 2018-08-14 | Ultrasonic knife conduction rod and ultrasonic knife |
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| CN201810920954.2A CN110811770B (en) | 2018-08-14 | 2018-08-14 | Ultrasonic knife conduction rod and ultrasonic knife |
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| CN114587509B (en) * | 2022-03-09 | 2024-04-05 | 苏州锐诺医疗技术有限公司 | Wireless ultrasonic knife |
| CN116919535B (en) * | 2022-10-13 | 2024-05-07 | 以诺康医疗科技（苏州）有限公司 | Ultrasonic surgical tool bit |
| CN115869046B (en) * | 2023-03-08 | 2023-06-20 | 杭州康基医疗器械有限公司 | Miniature open ultrasonic scalpel center rod |
| 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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