An ultrasonic knife bar anti-collision performance testing device and testing method

Abstract

The present invention discloses a device for testing the collision resistance performance of an ultrasonic tool bar, which includes a laser vibrometer, a load loading component, and a collision device; the laser vibrometer is used to measure the amplitude and frequency of the working part of the ultrasonic tool bar; the load loading component is used to apply a clamping force to the working part of the ultrasonic tool bar; the collision device is used to apply a collision to the ultrasonic tool bar. The present invention also discloses a method for testing the collision resistance performance of an ultrasonic tool bar. The present invention applies the principle of energy balance, controls the frictional force by controlling the clamping force, and then evaluates the power consumed by friction in a single state. By combining the data changes before and after the experiment, a unified change amount of energy transmission efficiency is obtained. Combining the intensity and number of collisions, the sensitivity of different tool bars to collisions is evaluated.

Description

Technical Field

[0001] The present invention relates to a device and method for testing the collision resistance performance of an ultrasonic knife rod, belonging to the technical field of ultrasonic knife medical devices. Background Art

[0002] With the development of medical technology, endoscopic surgery, as a new type of surgery, has been increasingly favored by doctors and patients due to its advantages such as small surgical incisions. In laparoscopic surgery, the ultrasonic knife is favored by the operators due to its good cutting and coagulation ability and small thermal damage.

[0003] When the ultrasonic knife is working, the collision of other instruments against the ultrasonic knife will cause damage to the knife rod or a decrease in the ultrasonic energy transfer efficiency. The collision resistance performance of the knife rod, that is, the impact of the collision on its energy conduction ability, is an important indicator for evaluating the performance of the ultrasonic knife rod, and has an important impact on the quality and stable use of the ultrasonic guide rod. However, there is currently no corresponding evaluation method to evaluate the collision resistance performance of the knife rod. Summary of the Invention

[0004] In order to test the collision resistance performance of the ultrasonic guide rod, the present invention provides a device for testing the collision resistance performance of an ultrasonic knife rod, and the specific technical solution is as follows.

[0005] An ultrasonic knife rod collision resistance performance testing device, characterized by comprising a laser vibrometer, a load loading assembly, and a collision device;

[0006] The laser vibrometer is used to measure the amplitude and frequency of the working part of the ultrasonic knife rod;

[0007] The load loading assembly is used to apply a clamping force to the working part of the ultrasonic knife rod;

[0008] The collision device is used to apply a collision to the ultrasonic knife rod.

[0009] Further, the laser vibrometer includes a laser probe, and the laser probe is arranged on a base; the load loading assembly includes a first clamping block, a second clamping block, and a driving mechanism, the driving mechanism is used to drive the second clamping block, and a pressure sensor is arranged between the driving mechanism and the second clamping block. Preferably, a buffer block is further arranged between the driving mechanism and the second clamping block.

[0010] Further, the collision device includes a collision motor and a collision rod, and the collision motor is used to drive the collision rod to swing. Preferably, the collision motor is installed on a motor fixing bracket, and the motor fixing bracket is fixedly arranged on the sliding table, and the sliding table is connected to a linear driving mechanism. The direct driving mechanism can drive the sliding table to move linearly, so as to move the collision motor to different positions of the ultrasonic knife rod, and realize collision at different positions of different ultrasonic knife rods. The linear driving mechanism can be a lead screw nut mechanism, a gear rack mechanism, a belt slider mechanism, etc.

[0011] Further, a knife rod guide seat is also arranged on the base, and the knife rod guide seat is provided with a through guide hole; the laser probe is aligned with the guide hole.

[0012] Further, cooling systems are arranged inside both the first clamping block and the second clamping block. The cooling system helps to maintain the temperature of the clamping block and keep the friction force constant.

[0013] Based on the same inventive concept, the present invention also relates to a method for testing the anti-collision performance of an ultrasonic knife rod, which is characterized in that the above-mentioned ultrasonic knife rod anti-collision performance testing device is adopted, and mainly includes the following steps:

[0014] 1), Connect the ultrasonic knife rod to the transducer, and the transducer is connected to the ultrasonic host, and keep the output power of the ultrasonic host constant; use a laser vibrometer to detect the amplitude and frequency of the working part of the ultrasonic knife rod;

[0015] 2), Use the load loading component to apply a clamping force to the working part of the ultrasonic knife rod, and record the clamping force F1 at this time when the amplitude and frequency of the ultrasonic knife rod are stable;

[0016] 3), The load loading component releases the clamping of the ultrasonic knife rod, the collision device applies a collision to the ultrasonic knife rod, and record the collision position and the number of times;

[0017] 4), Use the load loading component to apply a gradually increasing clamping force to the working part of the ultrasonic knife rod. When the amplitude and frequency of the ultrasonic knife rod are stable at the same level as those in step 2), record the clamping force F2 at this time; if the difference between F1 and F2 is greater than a predetermined value, stop the test; if the difference between F1 and F2 does not reach the predetermined value, repeat step 3).

[0018] Among them, "the amplitude and frequency of the ultrasonic knife rod are stable at the same level as those in step 2)" means that the difference in amplitude is within a certain range, and the difference in frequency is within a certain range, that is, the amplitude in step 4) reaches the specified amplitude range.

[0019] Further, the amplitude in step 2) is greater than or equal to the minimum amplitude required for the knife rod to reach the cutting threshold acceleration at the knife rod resonance frequency.

[0020] The working principle of the present invention is as follows. During the shearing operation of the ultrasonic knife bar, stable vibration needs to be maintained. The condition for maintaining vibration is that the energy received by its working part (the energy transmitted by the transducer) is equal to the consumed energy, that is, the energy transmitted by the rear knife bar is equal to the energy consumed by doing work on the tissue. A large part of the consumed energy is used to do work against the friction force between the knife bar and the tissue. The power loss of this part depends on the moving speed of the front end of the knife bar, the positive pressure received, and the friction coefficient of the interface.

[0021] Clamping force is applied to the working part of the ultrasonic knife bar using specified materials. Preferably, liquid circulation is used to control the temperature of the clamping block to ensure a relatively stable friction coefficient at its contact interface. When the vibration frequency and amplitude of the working part of the ultrasonic knife bar are stable, the energy loss of the working part of the ultrasonic knife bar is proportional to the positive pressure of the knife bar.

[0022] Relatively speaking, for the entire ultrasonic system, the ultrasonic main unit controls the electrical output performance, the transducer determines the conversion efficiency of electrical energy to acoustic energy, and the role of the ultrasonic knife bar is to transmit the energy of the transducer to the front working part of the knife bar. When the knife bar is damaged by collision, the energy transmission rate will decrease.

[0023] When the input at the rear end is constant (the output power of the ultrasonic main unit remains unchanged and the transducer remains unchanged), the reduction in the energy received by the front working part is completely related to the collision.

[0024] When the amplitude is stabilized within a specified range by adjusting the clamping force on the working part (the vibration frequency of the working part does not change), the power consumed by the working part is proportional to the positive pressure (clamping force) at this time. By recording the positive pressure required to reach the amplitude range, the power received by the front working part can be evaluated. The knife bar is collided repeatedly, and then the positive pressure is controlled so that the working part of the ultrasonic knife bar vibrates at a specified amplitude (the frequency remains unchanged during the change of the positive pressure) until the change value of the positive pressure reaches the preset requirement, and the experiment is completed. By statistically analyzing the collision data during this period, the collision data received by the knife bar when the transmission efficiency of the knife bar is reduced to the specified range can be obtained, and its anti-collision performance can be evaluated. If the transmission efficiency of the knife bar is reduced to the specified range only after repeated collisions, it indicates good anti-collision performance. Otherwise, it indicates that the ultrasonic knife bar is very sensitive to collisions. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the anti-collision performance test device for the ultrasonic knife bar of the present invention;

[0026] Figure 2 It is a schematic diagram of the workbench assembly;

[0027] Figure 3 Schematic diagram of the collision device;

[0028] Figure 4 Schematic diagram of the load loading component.

[0029] In the figure: laser vibrometer 1, control center 2, workbench component 3, ultrasonic host 4, ultrasonic tool bar 5, laser probe 301, base 302, load loading component 303, tool bar guide seat 304, collision device 305, transducer 306, transducer moving device 307, lead screw slider 3051, collision rod 3052, collision rod connecting seat 3053, motor fixing bracket 3054, collision motor 3055, electric push-pull rod 3031, loading device base 3032, pressure sensor 3033, buffer block 3034, clamp block A 3035, clamp block B 3036. Specific embodiments

[0030] The present invention will be further described in detail below in conjunction with embodiments.

[0031] As Figures 1 to 4 shown, the ultrasonic tool bar anti-collision performance test device includes a laser vibrometer 1, a control center 2, a workbench component 3, and an ultrasonic host 4.

[0032] The laser vibrometer is used to collect the vibration data of the working part of the ultrasonic tool bar 5 and feedback it to the control center 2. The working part of the ultrasonic tool bar 5 is the tool head of the ultrasonic knife, which is mainly used to cut tissues and coagulate blood vessels. The control center 2 can control the actions of all mechanical components on the workbench component and can display the status and data of each sensor in real time. And can write relevant programs according to needs to automatically complete the test. It can also manually control each component through the control components. The workbench component 3 is a work execution component, which accepts the instructions of the control center 2 to complete corresponding actions. And the corresponding data is collected by the equipped sensors and fed back to the control center. The ultrasonic host 4 provides stable and reliable electrical output to ensure that the transducer 306 and the tool bar 5 work in a stable state.

[0033] As Figure 2As shown, all components are fixed to the base 302. The placement position of the laser probe 301 of the laser vibrometer 1 and the main amplitude direction of the ultrasonic knife bar 5 are on the same axis, which can effectively collect the vibration data (vibration frequency and amplitude) in the vibration state. The load loading component 303 adds mechanical load to the ultrasonic system by clamping the working part of the ultrasonic knife bar 5. The knife bar guide seat 304 provided on the base 302 provides a guiding function for the movement of the knife bar. The knife bar guide seat 304 has a through guiding hole (not shown), and the ultrasonic knife bar 5 passes through this guiding hole. A transducer moving device 307 is also provided on the base 302, and the transducer moving device 307 is used to adjust the positions of the transducer 306 and the ultrasonic knife bar 5 to ensure that the knife bar and the transducer assembly can move to the specified state. The collision device 305 completes the collision of different intensities at different positions of the knife bar through the coordinated action of the internal motor.

[0034] As Figure 3 described, the lead screw slide 3051 (an example of a linear drive mechanism) is a conventional lead screw slide assembly. A collision motor 3055 is fixedly connected to its slide through a motor fixing bracket 3054. The collision motor 3055 is a servo motor, and its movement speed and torque can be controlled through the control system. A collision rod 3052 and a collision rod connecting seat 3053 are assembled on the rotating shaft of the collision motor 3055 and are relatively fixed to the rotating shaft. The collision rod 3052 is made of common medical metal materials and can imitate the situation of the collision between the instrument and the knife bar during surgery. By adjusting its relative position through the lead screw slide and then adjusting the operating parameters of the servo motor, different speeds and collision forces can be set to collide with the knife bar.

[0035] As Figure 4 shown: The electric push-pull rod 3031 (an example of a drive mechanism) is a common electric push rod or oil cylinder, etc. Its telescopic rod can extend and retract in length according to the electric control instructions of the control system. It is fixed to the upper wall of the loading device base 3032. The loading device base 3032 is a C-shaped fixed base, which is processed from metal materials and can provide sufficient mechanical strength. A pressure sensor 3033, a buffer block 3034, and a second clamping block 3035 are assembled at the front end of the telescopic rod of the electric push rod. The telescopic movement of the telescopic rod can drive the components fixed on it to move accordingly, and together with the second clamping block 3036, it clamps the working part (not shown) of the ultrasonic knife bar 5. The pressure sensor can effectively check the clamping force. The buffer block is an elastic buffer device, which can effectively buffer the fluctuation of the positive pressure of the telescopic rod to make the loading more stable.

[0036] During use, assemble the ultrasonic tool bar 5 and the transducer 306, set the corresponding test parameters to control the experimental intensity, and start the experiment. The transducer moving device 307 moves the ultrasonic tool bar 5 to the loading area. The ultrasonic main unit 4 activates the transducer 306 to make it excited. Control the load loading component 303 to clamp the working part of the ultrasonic tool bar 5. The laser vibrometer 1 monitors the amplitude and frequency data, and continuously and slowly increases the load intensity (clamping force). Adjust the amplitude to the set range, record the clamping force F1 at this time, retract the telescopic rod, open the load tooling, and retract the transducer moving device 307. The collision device 305, according to the preset program, collides with the tool bar once or multiple times while the tool bar is excited or not excited. The transducer moving device 307 moves the tool bar to the loading area again, continues to clamp and load until the amplitude reaches the specified range (the level equivalent to the previous amplitude), record the clamping force F2, and so on until the difference between F1 and F2 reaches the preset range. Record the collision intensity and number of times data, and the test is completed.

[0037] This patent evaluates the energy transmission efficiency of the ultrasonic tool bar by testing and comparing the tolerance of the tool bar to friction before and after collision, so as to form two corresponding relatively stable state values of energy transfer efficiency. Then, combined with the controllable collision experiment, the collision resistance of the tool bar is evaluated, which is simple and effective.

[0038] The embodiments of the present invention have been described above in conjunction with the accompanying drawings. Without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other. The present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present invention, those of ordinary skill in the art can also make many forms without departing from the purpose of the present invention and the scope protected by the claims, and these all belong to the protection scope of the present invention.

Claims

1. A method for testing the collision resistance performance of an ultrasonic knife bar, characterized in that an ultrasonic knife bar collision resistance performance testing device is adopted. The ultrasonic knife bar collision resistance performance testing device includes a laser vibrometer, a load loading component and a collision device; the laser vibrometer is used to measure the amplitude and frequency of the working part of the ultrasonic knife bar; the load loading component is used to apply a clamping force to the working part of the ultrasonic knife bar; the collision device is used to apply a collision to the ultrasonic knife bar; the testing method includes the following steps: 1), connect the ultrasonic knife bar to the transducer, connect the transducer to the ultrasonic host, and keep the output power of the ultrasonic host constant; use the laser vibrometer to detect the amplitude and frequency of the working part of the ultrasonic knife bar; 2), use the load loading component to apply a clamping force to the working part of the ultrasonic knife bar, and record the clamping force F1 at this time when the amplitude and frequency of the ultrasonic knife bar are stable; 3), the load loading component releases the clamping of the ultrasonic knife bar, the collision device applies a collision to the ultrasonic knife bar, and record the position and number of collisions; 4), use the load loading component to apply a gradually increasing clamping force to the working part of the ultrasonic knife bar. When the amplitude and frequency of the ultrasonic knife bar are stable at the same level as the amplitude and frequency in step 2), record the clamping force F2 at this time; if the difference between F1 and F2 is greater than a predetermined value, stop the test; if the difference between F1 and F2 does not reach the predetermined value, repeat step 3).

2. The method for testing the collision resistance performance of an ultrasonic knife bar according to claim 1, characterized in that the laser vibrometer includes a laser probe, and the laser probe is arranged on the base; the load loading component includes a first clamping block, a second clamping block and a driving mechanism, and the driving mechanism is used to drive the second clamping block, and a pressure sensor is arranged between the driving mechanism and the second clamping block.

3. The method for testing the collision resistance performance of an ultrasonic knife bar according to claim 2, characterized in that a buffer block is further arranged between the driving mechanism and the second clamping block.

4. The method for testing the collision resistance performance of an ultrasonic knife bar according to claim 1, characterized in that the collision device includes a collision motor and a collision rod, and the collision motor is used to drive the collision rod to swing.

5. The method for testing the collision resistance performance of an ultrasonic knife bar according to claim 4, characterized in that the collision motor is installed on a motor fixing bracket, the motor fixing bracket is fixedly arranged on the sliding table, and the sliding table is connected to a linear driving mechanism.

6. The method for testing the collision resistance performance of an ultrasonic knife bar according to claim 2, characterized in that it further includes a knife bar guiding seat arranged on the base, and the knife bar guiding seat is provided with a through guiding hole; the laser probe is aligned with the guiding hole.

7. The method for testing the collision resistance performance of an ultrasonic knife bar according to claim 2, characterized in that a cooling system is arranged inside both the first clamping block and the second clamping block.

8. The method for testing the collision resistance performance of an ultrasonic knife bar according to claim 1, characterized in that the amplitude in step 2) is greater than or equal to the minimum amplitude required for the knife bar to reach the cutting threshold acceleration at the knife bar resonance frequency.

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