CN218943444U

CN218943444U - Flexible clamping ultrasonic surgical knife

Info

Publication number: CN218943444U
Application number: CN202223027089.XU
Authority: CN
Inventors: 佘军军; 郑孝明; 马任远; 胡晨浩; 郑腾飞; 武海军; 武志刚
Original assignee: First Affiliated Hospital of Medical College of Xian Jiaotong University
Current assignee: First Affiliated Hospital of Medical College of Xian Jiaotong University
Priority date: 2022-11-15
Filing date: 2022-11-15
Publication date: 2023-05-02
Anticipated expiration: 2032-11-15

Abstract

The utility model discloses a flexible clamping ultrasonic surgical knife, which comprises: tool bit subassembly, handle and the transducer mechanism who is connected with the tool bit subassembly, transducer mechanism includes: the device comprises a front shell, a rear shell, a transducer and a flexible flange, wherein an annular clamping groove is formed in the front shell, and a small hole is formed in the rear part of the rear shell; the flexible flange includes: the utility model discloses a transducer, which comprises a circular sleeve and a plurality of notch-shaped flexible hinges, wherein the circular sleeve is clamped in a circular clamping groove and is sleeved at the front end of a variable amplitude rod in an interference fit manner, two arc-shaped notches are symmetrically arranged on two sides of each flexible hinge, the plurality of flexible hinges are discharged in a rectangular array by taking the variable amplitude rod as a central shaft and are connected between the front end of the variable amplitude rod and the inner side of the circular sleeve.

Description

Flexible clamping ultrasonic surgical knife

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a flexible clamping ultrasonic surgical knife.

Background

An ultrasonic cutting hemostasis system (hereinafter referred to as an ultrasonic surgical knife) is one of surgical instruments widely used in clinical medical treatment processes, and is an accurate and efficient energy surgical instrument. The ultrasonic surgical knife integrates three functions of separation, cutting and hemostasis, and the efficiency and the safety of the operation are obviously improved.

The ultrasonic surgical knife in the market is mostly powered by an alternating current power supply, and generates a high-frequency electric pulse signal through a function generator and a signal amplifier. The generated high-frequency electric pulse signal is converted into high-frequency mechanical vibration through the piezoelectric material of the ultrasonic transducer, and then is transmitted to the working part of the tool bit assembly through the amplitude transformer and the connecting rod, and finally the high-frequency mechanical vibration is output at the working part of the tool bit assembly. The working part of the ultrasonic surgical tool bit assembly with high-frequency vibration can locally generate various physiological effects including micro-acoustic flow effect, cavitation effect, thermal effect and the like, and finally achieves the functions of cutting and hemostasis.

In the whole ultrasonic knife system, the transducer plays a central role as a key element for converting electric energy into mechanical energy. The ability of an ultrasonic surgical blade system to perform cutting and hemostasis depends largely on the performance of the transducer. The transducer is mostly mounted to the sleeve-like housing by means of clamping flanges. During operation of the transducer, force and moment disturbances from the clamping housing are unavoidable due to the interaction of the clamping housing and the clamping flange. If the location of the clamping flange is not properly selected, some of the ultrasonic energy may be transferred to the clamping housing through the flange, resulting in loss of ultrasonic energy and a reduction in the amplitude of vibration of the transducer. To address this problem, flanges are typically designed at the transducer longitudinal vibration node.

In theory, the vibration displacement at the node of the longitudinal vibration of the transducer is 0, the clamping flange is designed at the node without longitudinal vibration, so that the interference influence of the clamping shell on the transducer is eliminated, and the energy loss is avoided. However, in reality: first, the vibration node is a point and the clamping flange is a rigid solid of a thickness, so that it is not possible to completely eliminate the interaction between the clamping housing and the clamping flange. Second, the distribution position of the vibration node is closely related to the resonant frequency of the transducer, and the resonant frequency of the transducer is closely related to the excitation voltage, the bolt pretightening force, the load condition, the self-heating condition and the like of the transducer, which all cause the position of the vibration node to be uncertain under the working condition of the transducer.

Disclosure of Invention

The utility model aims to provide a flexibly clamped ultrasonic surgical knife so as to solve the problems.

The technical scheme of the utility model is as follows:

an ultrasonic surgical blade having a flexible grip, comprising: tool bit subassembly, handle and with the transducer mechanism that the tool bit subassembly is connected, transducer mechanism includes: the device comprises a front shell, a rear shell, a transducer and a flexible flange, wherein the front shell and the rear shell are in threaded connection to form a main shell, the transducer is arranged inside the main shell, an annular clamping groove is formed in the front shell, the shell of the flexible flange is fixedly clamped in the annular clamping groove, the flexible flange is clamped at the front end of an amplitude transformer of the transducer, and small holes are formed in the rear part of the rear shell and used for paving power supply lines and signal lines of the transducer;

the flexible flange comprises: the device comprises a circular sleeve and a plurality of notch-type flexible hinges, wherein the circular sleeve is clamped in the circular clamping groove and is sleeved at the front end of an amplitude transformer in an interference fit manner, two arc-shaped notches are symmetrically formed in two sides of each flexible hinge, and the plurality of flexible hinges are discharged in a rectangular array by taking the amplitude transformer as a central shaft and are connected between the front end of the amplitude transformer and the inner side of the circular sleeve.

Further, the tool bit assembly is selected from one of a straight rod type and a stepped type, and the tool bit assembly is connected with an amplitude transformer of the energy converter mechanism by a double-end stud.

Further, the amplitude transformer and the flexible flange are made of aluminum alloy materials, and the rear end cover and the bolt of the transducer are made of alloy steel through machining.

Further, the flexible hinge of the flexible flange is characterized in that the length 2L of the flexible hinge is 4mm, the width w is 1mm, and the height h is 1mm.

Further, the radius r of the arc-shaped notch of the flexible hinge is 0.45mm, the thickness t of the central position of the flexible hinge between the two arc-shaped notches is 0.1mm, the flexible flange 5 has higher flexibility in the longitudinal vibration direction of the transducer 3, and the flexibility in other directions is smaller, so that the influence of interference force and moment on the conversion efficiency of the transducer is reduced.

Compared with the prior art, the utility model has the beneficial effects that:

1. the utility model can make the transducer generate a certain degree of translation and rotation in the longitudinal vibration direction, thereby reducing the energy loss between the clamping shell and the clamping flange, improving the motion decoupling capacity of the transducer, increasing the vibration transmitted to the cutter head assembly by the transducer, and finally generating high-frequency vibration at the cutter head assembly part, thereby achieving the effect of cutting tissues.

2. The front section of the transducer adopts the detachable tool bit assembly, and the tool bit assembly belongs to consumables in the medical treatment process, so that when the transducer is used, only a new tool bit assembly is needed to be replaced, the utilization rate of the transducer is improved, the cost is reduced to the greatest extent, and the transducer has wide market and application prospect.

Drawings

Fig. 1 is a schematic view of the general structure of a flexible clamping ultrasonic surgical blade of the present utility model.

Fig. 2 is a schematic view of the general structure of the flexible clamping ultrasonic surgical blade of the present utility model in cross section.

Fig. 3 is a schematic structural view of a flexible clamping ultrasonic surgical blade head assembly according to the present utility model.

Fig. 4 is a schematic view of the front housing structure of the flexible clamping ultrasonic surgical blade of the present utility model.

Fig. 5 is a schematic view of the structure of the rear housing of the flexible clamping ultrasonic surgical blade of the present utility model.

Fig. 6 is a schematic diagram of the transducer structure of the flexible clamping ultrasonic surgical blade of the present utility model.

Fig. 7 is a shape, size and parameter chart of a notch type double-twisted flexible hinge of the flexible clamping ultrasonic surgical knife.

In the figure: 1. a cutter head assembly; 2. a front housing; 3. a transducer; 4. a rear housing; 5. a flexible flange; 6. a horn; 7. a rear end cover; 8. a bolt; 9. PZT piezoelectric ceramics.

Detailed Description

The following describes in detail the embodiments of the present utility model with reference to fig. 1 to 7. In the description of the present utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

The terms "first," "second," and the like, 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 defining "a first", "a second" may include one or more such features, either explicitly or implicitly; in the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.

It should be noted that, the circuit connection related in the present utility model adopts a conventional circuit connection manner, and no innovation is related.

Examples

As shown in fig. 1-6, a flexibly clamped ultrasonic surgical blade comprising: a cutter head assembly 1, a handle and a transducer mechanism 3 connected with the cutter head assembly 1, as shown in fig. 6, the transducer mechanism 3 comprises: the device comprises a front shell 2, a rear shell 4, a transducer and a flexible flange 5, wherein the front shell 2 and the rear shell 4 are in threaded connection to form a main shell, the transducer is arranged inside the main shell, as shown in fig. 4 and 5, an annular clamping groove is formed in the front shell 2, the shell of the flexible flange 5 is fixedly clamped in the annular clamping groove, the flexible flange 5 is clamped on the front end of an amplitude transformer 6 of the transducer, and a small hole is formed in the rear part of the rear shell 4 and used for laying a power supply line and a signal line of the transducer;

as shown in fig. 6 and 7, the flexible flange 5 includes: the flexible hinge comprises a circular sleeve and a plurality of notch-type flexible hinges, wherein the circular sleeve is clamped in the circular clamping groove and is sleeved at the front end of an amplitude transformer 6 in an interference fit manner, two arc-shaped notches are symmetrically formed in two sides of each flexible hinge, the plurality of flexible hinges are discharged in a rectangular array by taking the amplitude transformer 6 as a central shaft and are connected between the front end of the amplitude transformer 6 and the inner side of the circular sleeve, and the flexible flange 5 has higher flexibility in the longitudinal vibration direction of the transducer 3 and has smaller flexibility in other directions, so that the influence of interference force and moment on the conversion efficiency of the transducer is reduced.

The amplitude transformer 6 and the rear end cover 7 of the transducer clamp four PZT piezoelectric ceramics 9 back and forth and assemble the four PZT piezoelectric ceramics by bolts 8, copper electrode plates are clamped between the four PZT piezoelectric ceramics, and a connection mode of parallel connection and mechanical series connection of negative-positive-negative circuits is adopted.

Preferably, the tool bit assembly 1 is one of a straight rod type and a stepped type, and the tool bit assembly 1 is connected with the amplitude transformer of the transducer mechanism 3 by a double-end stud.

Specifically, the amplitude transformer and the flexible flange 5 are made of aluminum alloy materials, and the rear end cover and the bolts of the transducer are manufactured by processing alloy steel.

Preferably, the length 2L of the flexible hinge of the flexible flange is 4mm, the width w is 1mm, the height h is 0.8mm, the radius r of the arc-shaped part of the arc-shaped notch of the flexible hinge is 0.45mm, the thickness t of the middle position of the flexible hinge between the two arc-shaped notches is 0.1mm, and the notch-type flexible hinge can provide certain flexibility under the condition that the size is not multiplied, so that the energy loss of a disturbance torque in the ultrasonic transmission process is reduced, and the motion decoupling capacity is improved. The flexible hinge manufactured by the data can meet the rigidity requirement of medical staff when cutting tissues, and meanwhile, the output amplitude of the energy converter is improved by 12%, and the energy conversion efficiency is improved by 4.3%.

The foregoing disclosure is only illustrative of the preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited thereto, and any variations within the scope of the present utility model will be apparent to those skilled in the art.

Claims

1. A flexibly clamped ultrasonic surgical blade, comprising: tool bit subassembly (1), handle and with transducer mechanism (3) that tool bit subassembly (1) are connected, transducer mechanism (3) include: the device comprises a front shell (2), a rear shell (4), a transducer and a flexible flange (5), wherein the front shell (2) and the rear shell (4) are in threaded connection to form a main shell, the transducer is arranged inside the main shell, an annular clamping groove is formed in the front shell (2), the shell of the flexible flange (5) is fixedly clamped in the annular clamping groove, the flexible flange (5) is clamped at the front end of an amplitude transformer (6) of the transducer, and small holes are formed in the rear part of the rear shell (4) and used for laying power supply lines and signal lines of the transducer;

the flexible flange (5) comprises: the device comprises a circular sleeve and a plurality of notch-type flexible hinges, wherein the circular sleeve is clamped in the circular clamping groove and is sleeved at the front end of an amplitude transformer (6) in an interference fit manner, two arc-shaped notches are symmetrically formed in two sides of each flexible hinge, and the plurality of flexible hinges are discharged in a rectangular array by taking the amplitude transformer (6) as a central shaft and are connected between the front end of the amplitude transformer (6) and the inner side of the circular sleeve.

2. The flexible clamped ultrasonic surgical blade of claim 1, wherein the blade assembly (1) is one of a straight bar type and a stepped type, and wherein the blade assembly (1) is connected to the horn of the transducer mechanism (3) using a stud.

3. A flexible clamped ultrasonic surgical blade according to claim 1, wherein the horn and flexible flange (5) are fabricated from an aluminium alloy material and the rear end cap and bolts of the transducer are fabricated from an alloy steel.

4. The flexible clamped ultrasonic surgical blade of claim 1, wherein the flexible hinge of the flexible flange has a length 2L of 4mm, a width w of 1mm, and a height h of 1mm.

5. The flexible clamping ultrasonic surgical blade of claim 1, wherein the radius r of the arc-shaped notch of the flexible hinge is 0.45mm, and the thickness t of the middle position of the flexible hinge between the two arc-shaped notches is 0.1mm.