CN217765885U

CN217765885U - Wire bending fatigue testing machine

Info

Publication number: CN217765885U
Application number: CN202221880488.8U
Authority: CN
Inventors: 周志强
Original assignee: Suzhou Wushuang Medical Equipment Co ltd
Current assignee: Suzhou Wushuang Medical Equipment Co ltd
Priority date: 2022-07-20
Filing date: 2022-07-20
Publication date: 2022-11-08
Anticipated expiration: 2032-07-20

Abstract

The utility model provides a wire bending fatigue testing machine, include: the electric control cabinet is internally provided with a PLC control system; the swinging mechanism is fixedly arranged in the electric control cabinet and is electrically connected with the PLC control system; the mounting rack comprises an upper support and two stand columns, the upper support is connected with one end, extending out of the electric control cabinet, of the swing mechanism, and two ends of the upper support are respectively and rotatably connected to the upper ends of the two stand columns; the fixing devices are arranged on the upper bracket side by side and are connected with the swing mechanism through the upper bracket; the plurality of restraining devices are arranged on the two upright columns side by side; the PLC control system drives the swing mechanism to drive the fixing device to circularly swing at a certain angle at two sides in the vertical direction at a certain frequency. The utility model discloses compact structure, easy and simple to handle, the feasibility is high, can satisfy the parameter requirement of test method in YY/T0492-2017.

Description

Wire bending fatigue testing machine

Technical Field

The utility model relates to a wire test technical field, specificly relate to a wire bending fatigue testing machine.

Background

Implantable cardiac pacemakers and defibrillators are one of the most effective and commonly used means for treating arrhythmia at present, wherein an electrode lead is used as an electric signal conduction path in the implantable cardiac pacemakers and defibrillators, is a material which cannot be frequently replaced and needs to be implanted into a body for a long time, so the reliability of the electrode lead is very important. Specifically, after the electrode lead is implanted into a body, the head end of the electrode lead is fixed on an endocardium or an epicardium, the head end of the electrode lead can be bent back and forth along with the pulsation of the heart, and as the long-term implantation time of the electrode lead is usually more than 10 years, if the fatigue of the electrode lead is too low, the electrode lead is easy to break. Therefore, it is required to test the bending fatigue property of the electrode lead to ensure the safety thereof in use.

Currently, the medical industry standard "implantable pacemaker electrode lead" (YY/T0492-2017) has specified the bending fatigue test of implantable pacemaker electrode leads. The "bending fatigue test" section specified by the standard includes two tests, i.e., "bending fatigue test of the wire segment" and "bending fatigue test of the portion of the wire connected to the connector". In the bending fatigue test of the lead segment, a special lead fixing device is required to be used for fixing the electrode lead to be tested, and the lead fixing device needs to be driven by a machine to circularly swing at least 47000 times at a frequency of about 2Hz at an angle of +/-90 degrees on two sides in the vertical direction. In the bending fatigue test of the connection part of the lead and the connector, a special connector fixing device is required to be used for fixing the connector, and the connector fixing device needs to circularly swing at least 82000 times at an angle of +/-45 +/-2 DEG on two sides in the vertical direction at a frequency of about 2Hz under the drive of a machine. However, the standard provides only a structural schematic of the wire fixing device and the connector fixing device, and does not provide a structural schematic of the machine.

In addition, an electrode lead bending fatigue testing machine in the prior art, for example, chinese patent CN204944961U discloses a bending fatigue performance testing device, which includes a reciprocating motion transmission mechanism, a holder, and a driver, where the driver is connected to the reciprocating motion transmission mechanism, a test object is disposed between the reciprocating motion transmission mechanism and the holder, a first end of the test object is fixed by the holder, and under the driving of the driver, the reciprocating motion transmission mechanism fixes and drives a second end of the test object to make a linear reciprocating motion relative to the first end of the test object fixed by the holder. Although the bending fatigue performance testing equipment can also simulate reciprocating bending to carry out bending fatigue test, the bending fatigue performance testing equipment obviously cannot meet the requirements of the standard testing method of YY/T0492-2017, and cannot carry out the bending fatigue test on the connecting part of the lead and the connector.

Therefore, it is highly desirable to design an electrode lead bending fatigue testing machine provided with a lead fixing device and a connector fixing device, which can efficiently complete a bending fatigue test according to the standard method of YY/T0492-2017.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome prior art's defect, provide a wire bending fatigue testing machine that can carry out bending fatigue test according to YY/T0492-2017's standard method high efficiency.

In order to achieve the above and other objects, the present invention is achieved by including the following technical solutions: the utility model provides a wire bending fatigue testing machine, a serial communication port, include: the electric control cabinet is internally provided with a PLC control system; the swinging mechanism is fixedly arranged in the electric control cabinet and is electrically connected with the PLC control system; the mounting rack comprises an upper support and two stand columns, the upper support is connected with one end, extending out of the electric control cabinet, of the swing mechanism, and two ends of the upper support are respectively and rotatably connected to the upper ends of the two stand columns; the fixing devices are arranged on the upper bracket side by side and connected with the swing mechanism through the upper bracket; the plurality of restraining devices are arranged on the two upright columns side by side; the PLC control system drives the swing mechanism to drive the fixing device to circularly swing at a certain angle at two sides in the vertical direction at a certain frequency. The bending fatigue test of the implanted cardiac pacemaker electrode lead is realized according to the standard method of the implanted cardiac pacemaker electrode lead (YY/T0492-2017).

In one embodiment, the swing mechanism comprises a driver, a transmission assembly and a swing assembly, the driver is connected with one end of the transmission assembly, the other end of the transmission assembly is connected with the swing assembly, and the driver drives the transmission assembly to do linear reciprocating motion, so that the swing assembly is driven to swing circularly.

In one embodiment, the transmission assembly comprises an eccentric wheel, a connecting rod, a sliding block and a gear rack, the center of the eccentric wheel is connected with the driver, one end of the connecting rod is connected with the eccentric wheel, the other end of the connecting rod is connected with the sliding block, and the gear rack is fixedly connected to the upper end face of the sliding block.

In an embodiment, the swing assembly comprises a gear, a swing rod, a bearing seat and a flat key, the gear is placed on the gear rack and meshed with the gear rack, one end of the swing rod is rotatably connected with the bearing seat through a bearing, the other end of the swing rod penetrates through a central hole of the gear and the other end of the swing rod is connected with one end of the flat key, and the other end of the flat key is connected with the upper bracket so as to drive the fixing device to circularly swing.

In one embodiment, the drive includes a servo motor and a reducer.

In one embodiment, a window is formed on an upper end face of the electric control cabinet, and the position of the connecting rod on the eccentric wheel is adjusted through the window to realize manual adjustment of the swing amplitude.

In one embodiment, a graduated ring is arranged on the electric control cabinet and is positioned at a position where the swing mechanism extends out of the electric control cabinet; the swing mechanism further comprises a pointer disc, and the pointer disc is tightly attached to the scale ring and arranged on the outer side of the electric control cabinet. Due to the design of the scale ring and the pointer plate, the swing amplitude is visual.

In one embodiment, the electronic control cabinet is further provided with an indicator light for indicating the state of the lead bending fatigue testing machine.

In one embodiment, the electronic control cabinet is further provided with a touch screen, and the touch screen is electrically connected with the PLC control system and used for inputting instruction parameters.

In an embodiment, a displacement sensor and a counting sensor are further arranged in the electric control cabinet, the displacement sensor and the counting sensor are respectively electrically connected with the PLC control system, the displacement sensor is used for determining the amplitude of oscillation, and the counting sensor is used for counting the number of times of oscillation. The counting sensor is designed to realize the function of memorizing the swinging times.

The utility model discloses compact structure, easy and simple to handle, the feasibility is high, can satisfy each item test parameter requirement of standard test method in "implanted cardiac pacemaker electrode wire" (YY/T0492-2017). And simultaneously, the utility model discloses can carry out 24 hours incessant tests, the speed of swaying is infinitely variable adjustable, and has outage memory function, has good use and spreading value.

Drawings

Fig. 1 shows that the utility model relates to a wire bending fatigue testing machine's spatial structure sketch map.

Fig. 2 shows a schematic top view of the wire bending fatigue testing machine of the present invention.

Fig. 3 is a schematic perspective view of the swing mechanism of the present invention.

Fig. 4 shows a schematic structure of a lead fixing device specified in the "electrode lead of implantable pacemaker" (YY/T0492-2017).

Fig. 5 shows a schematic structure of the connector fixture defined in "electrode lead of implantable pacemaker (YY/T0492-2017)".

Detailed Description

Please refer to fig. 1 to 5. The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein.

It should be understood that the structure, ratio, size and the like shown in the drawings attached to the present specification are only used for matching with the content disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essential meaning, and any structure modification, ratio relationship change or size adjustment should still fall within the scope that the technical content disclosed in the present invention can cover without affecting the function that the present invention can produce and the purpose that the present invention can achieve.

As shown in fig. 1 and 2, the utility model provides a wire bending fatigue testing machine 1, including automatically controlled cabinet 10, wabbler mechanism 20, mounting bracket 30, fixing device 40 and restraint device 50. A PLC control system (not shown in the figure) is arranged in the electric control cabinet 10, and the PLC control system is electrically connected with the swing mechanism 20. The swing mechanism 20 is fixedly arranged in the electric control cabinet 10, and one end of the swing mechanism extends out of the electric control cabinet 10 and is connected with the mounting frame 30. The mounting frame 30 comprises an upper bracket 31 and two upright posts 32, wherein two ends of the upper bracket 31 are respectively connected to the upper ends of the two upright posts 32 in a rotating manner. The fixing devices 40 are installed on the upper bracket 31 side by side, and are used for fixing the upper ends of the electrode leads or the connectors, and the fixing devices 40 are connected with the swing mechanism 20 through the upper bracket 31. The plurality of restraining devices 50 are arranged on the two upright posts 32 side by side, and the positions of the restraining devices 50 on the upright posts 32 are adjustable and used for restraining the lower ends of the electrode leads with different wire diameters or lengths. Further, the electric control cabinet 10 and the mounting frame 30 may be fixed on the ground or a movable bottom plate 60.

During testing, the PLC control system drives the swing mechanism 20 to drive the fixing device 40 to circularly swing at a certain angle at the two sides of the vertical direction at the frequency of about 2Hz, so that the bending fatigue test of the electrode lead of the implantable cardiac pacemaker is realized according to the standard method of electrode lead of the implantable cardiac pacemaker (YY/T0492-2017).

As shown in fig. 3, the swing mechanism 20 includes a driver 21, a transmission assembly 22 and a swing assembly 23, the driver 21 is connected to one end of the transmission assembly 22, the other end of the transmission assembly 22 is connected to the swing assembly 23, and the driver 21 drives the transmission assembly 22 to perform linear reciprocating motion, so as to drive the swing assembly 23 to perform cyclic swing.

Specifically, the transmission assembly 22 includes an eccentric wheel 221, a connecting rod 222, a sliding block 223 and a gear rack 224, the center of the eccentric wheel 221 is connected with the driver 21, one end of the connecting rod 222 is connected with the eccentric wheel 221, the installation position of the connecting rod 222 on the eccentric wheel 221 is adjustable, the other end of the connecting rod 222 is connected with the sliding block 223, and the gear rack 224 is fixedly connected to the upper end surface of the sliding block 223. The swing assembly 23 comprises a gear 231, a swing rod 232, a bearing seat 233 and a flat key 234, wherein the gear 231 is placed on the gear rack 224 and is meshed with the gear rack 224, one end of the swing rod 232 is rotatably connected with the bearing seat 233 through a bearing, and the other end of the swing rod 232 penetrates through a central hole of the gear 231 and the other end of the bearing seat 233 is connected with one end of the flat key 234.

The driver 21 is started, the driver 21 drives the eccentric wheel 221 to rotate, so as to drive the connecting rod 222 to pull the sliding block 223 and the gear rack 224 to do linear reciprocating motion on the linear sliding rail 225, the gear 231 realizes a certain angle of cyclic swing through the linear reciprocating motion of the gear rack 224, and drives the swing rod 232 and the flat key 234 to do cyclic swing. Referring to fig. 1, the other end of the flat key 234 is connected to the upper bracket 31, so as to drive the fixing device 40 mounted on the upper bracket 31 to circularly swing.

As shown in fig. 3, specifically, the driver 21 includes a servo motor 211 and a speed reducer 212, the servo motor 211 is connected to one end of the speed reducer 212, and the other end of the speed reducer 212 is connected to the transmission assembly 22. The combination design of the servo motor 211 and the speed reducer 212 can realize stepless adjustment of the swing speed.

Referring to fig. 1 and fig. 3, a graduated ring 11 is disposed on the electric control cabinet 10, and the graduated ring 11 is located at a position where the swing mechanism 20 extends out of the electric control cabinet 10. The swing mechanism 20 further comprises a pointer plate 24, and the pointer plate 24 is installed between the gear 231 and the flat key 234 and is arranged outside the electric control cabinet 10 in close contact with the graduated ring 11. The design of the graduated ring 11 and the pointer disc 24 enables the swing amplitude to be visualized.

As shown in fig. 1, 4 and 5, before the test, the type of the fixing device 40 needs to be changed according to the test contents. Specifically, when the "bending fatigue test of the wire segment" is performed, the fixing devices 40 are wire fixing devices 41 (see fig. 4). The diameter of the inner hole of the lead wire fixing means 41 is not more than 110% of the diameter of the electrode lead wire 2, and a radius R is formed at the inner surface of the lower end of the lead wire fixing means 41 ₁ When the electrode lead 2 is attached to the bell mouth 411, the center line of the electrode lead 2 forms a center line bending radius R of 6mm +/-0.1 mm ₂ . The lead wire fixture 41 can be oscillated by ± 90 ° from the vertical position to force the electrode lead 2 inside the bell 411 to bend. Further, a load 3 may be applied to the lower end of the test section of the electrode lead 2, and the weight of the load 3 ensures that the center line of the test section of the electrode lead 2 conforms to the bending radius R ₂ 。

The fixing means 40 are each a connector fixing means 42 (fig. 5) when the bending fatigue test of the portion where the wire is connected to the connector is performed. The connector fixture 42 resembles a pulse generator connector head, the connector fixture 42 being made of a rigid material, the depth of the cavity of the connector fixture 42 being the minimum allowed by the relevant standard, the electrode lead connector 4 being mounted in the cavity of the connector fixture 42. The connector fixing means 42 vertically suspends the electrode lead connector 4 from the electrode lead 2 by gravity, and the connector fixing means 42 can oscillate by ± 45 ± 2 ° from a vertical position, thereby forcing the electrode lead 2 connected to the electrode lead connector 4 to be bent. Further, a load 3 may be applied to the lower end of the electrode lead 2, the load 3 ensuring that there is no relative movement between the electrode lead 2 and the fixed point line 421.

Further, as shown in fig. 1, the specifications of the plurality of fixing devices 40 may be the same or different, and a plurality of electrode leads having the same diameter or different diameters may be subjected to a bending fatigue test simultaneously, which is highly efficient. Although the number of fixtures 40 shown in the figures is 6, this is not required and the number of fixtures 40 may be as many as desired for other designs. Although the greater the number of the fixing means 40, the higher the test efficiency, it is not preferable to provide the fixing means 40 in an excessive number in consideration of the load capacity of the rocking mechanism 20.

As shown in fig. 1 and 2, a window 12 is opened on an upper end surface of the electric control cabinet 10, and is used for observing the swing mechanism 20, and the position of the connecting rod 222 on the eccentric wheel 221 can be manually adjusted through the window 12 (i.e., the eccentric distance of the eccentric wheel 221 is adjusted), so as to realize adjustment of the swing amplitude, and the swing amplitude angle is mainly two gears of ± 90 ° and ± 45 °.

As shown in fig. 1, an indicator lamp 13 is further disposed on the electric control cabinet 10, and the indicator lamp 13 is electrically connected to the PLC control system and is used for indicating a state of the wire bending fatigue testing machine 1. Specifically, pilot lamp 13 is the tristimulus designation lamp, shows green lamp when normal operating, shows yellow lamp when the stop work, shows red lamp when failure alarm. Specifically, the indicator light 13 may be disposed on an upper end surface of the electric control cabinet 10.

As shown in fig. 1 and 2, a touch screen 14 is further disposed on the electric control cabinet 10, and the touch screen 14 is electrically connected to the PLC control system and is used for inputting instruction parameters, such as a swing speed, a swing frequency, and the like. Although not shown in the figure, a displacement sensor and a counting sensor electrically connected to the PLC control system are further disposed in the electric control cabinet 10, the displacement sensor is used for determining the amplitude of oscillation, and the counting sensor is used for counting the number of oscillations.

Referring to fig. 1-5, the working process of the present invention is as follows: firstly, according to the test content, selecting the wire fixing device 41 or the connector fixing device 42, and adjusting the eccentricity of the eccentric wheel 221 to select the swing angle (swing) required by the test content; secondly, setting the swing speed and the swing times required by the test content through the touch screen 14; then, the PLC control system controls the driver 21 to start, so that the swinging mechanism 20 drives the fixing device 40 to circularly swing; meanwhile, the amplitude of oscillation is judged through the displacement sensor, and the number of times of oscillation is counted through the counting sensor; and finally, when the running times reach the set swinging times, the PLC control system controls the driver 21 to stop working, and the test is completed.

To sum up, the utility model discloses compact structure, easy and simple to handle, the feasibility is high, can satisfy in "implanted cardiac pacemaker electrode wire" (YY/T0492-2017) each item test parameter requirement of standard test method. And simultaneously, the utility model discloses a PCL control system can carry out 24 hours incessant tests, and the speed of swaying is infinitely variable adjustable, and has outage memory function, cooperation the design of count sensor can realize swaing number of times memory function.

Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value. The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. A wire bending fatigue testing machine, characterized by comprising:

the electric control cabinet is internally provided with a PLC control system;

the swinging mechanism is fixedly arranged in the electric control cabinet and is electrically connected with the PLC control system;

the mounting rack comprises an upper support and two stand columns, the upper support is connected with one end, extending out of the electric control cabinet, of the swing mechanism, and two ends of the upper support are respectively and rotatably connected to the upper ends of the two stand columns;

the fixing devices are arranged on the upper bracket side by side and are connected with the swing mechanism through the upper bracket;

the plurality of restraining devices are arranged on the two upright columns side by side;

the PLC control system drives the swing mechanism to drive the fixing device to circularly swing at a certain angle at two sides in the vertical direction at a certain frequency.

2. The wire bending fatigue testing machine of claim 1, wherein the swinging mechanism comprises a driver, a transmission component and a swinging component, the driver is connected with one end of the transmission component, the other end of the transmission component is connected with the swinging component, and the driver drives the transmission component to perform linear reciprocating motion, so as to drive the swinging component to perform cyclic swinging.

3. The wire bending fatigue testing machine according to claim 2, wherein the transmission assembly comprises an eccentric wheel, a connecting rod, a sliding block and a gear rack, the center of the eccentric wheel is connected with the driver, one end of the connecting rod is connected with the eccentric wheel, the other end of the connecting rod is connected with the sliding block, and the gear rack is fixedly connected to the upper end face of the sliding block.

4. The wire bending fatigue testing machine of claim 3, wherein the swinging assembly comprises a gear, a swinging rod, a bearing seat and a flat key, the gear is placed on the gear rack and is meshed with the gear rack, one end of the swinging rod is rotatably connected with the bearing seat through a bearing, the other end of the swinging rod penetrates through a central hole of the gear and the other end of the swinging rod is connected with one end of the flat key through the bearing seat, and the other end of the flat key is connected with the upper bracket, so that the fixing device is driven to circularly swing.

5. The wire bending fatigue testing machine of claim 2, wherein the driver comprises a servo motor and a speed reducer.

6. The wire bending fatigue testing machine according to claim 3, wherein a window is formed on an upper end face of the electric control cabinet, and the position of the connecting rod on the eccentric wheel is adjusted through the window to realize amplitude adjustment.

7. The lead bending fatigue testing machine according to claim 1, wherein a graduated ring is arranged on the electric control cabinet, and the graduated ring is positioned at a position where the swing mechanism extends out of the electric control cabinet; the swing mechanism further comprises a pointer disc, and the pointer disc is tightly attached to the scale ring and arranged on the outer side of the electric control cabinet.

8. The lead bending fatigue testing machine according to claim 1, wherein an indicator lamp is further arranged on the electronic control cabinet and used for indicating the state of the lead bending fatigue testing machine.

9. The lead bending fatigue testing machine according to claim 1, wherein a touch screen is further arranged on the electric control cabinet, and the touch screen is electrically connected with the PLC control system and used for inputting instruction parameters.

10. The wire bending fatigue testing machine according to claim 1, wherein a displacement sensor and a counting sensor are further arranged in the electric control cabinet, the displacement sensor and the counting sensor are respectively electrically connected with the PLC control system, the displacement sensor is used for determining the amplitude of oscillation, and the counting sensor is used for counting the number of times of oscillation.