CN220084928U

CN220084928U - Multi-electrode catheter testing device

Info

Publication number: CN220084928U
Application number: CN202321571259.2U
Authority: CN
Inventors: 朱美娇; 胡登脉; 徐汪洋; 王贝贝
Original assignee: Shanghai Weiqi Medical Instrument Co ltd
Current assignee: Shanghai Weiqi Medical Instrument Co ltd
Priority date: 2023-06-19
Filing date: 2023-06-19
Publication date: 2023-11-24
Anticipated expiration: 2033-06-19

Abstract

The utility model relates to the technical field of cardiac interventional therapy catheter testing, and provides a multi-electrode catheter testing device, which comprises a bottom plate, wherein the bottom plate is provided with a plurality of electrodes; the bottom plate is provided with a plurality of catheter electrode fixing parts, and the catheter electrode fixing parts are used for fixing catheter electrodes; the catheter electrode fixing part is connected with an electronic switch on the electrode switch board through a wire; the electrode switch board is electrically connected with an electrode switch control panel, a plurality of control buttons are arranged on the electrode switch control panel, when different control buttons are pressed, control signals are generated, the control signals control the electronic switch to be closed, and one or more pairs of pre-designated electrodes are conducted. The control button on the electrode switch control panel is used for sending a control signal to the electrode switch board, the opening/closing of the electronic switch is selected, the catheter electrode is fixed by arranging the catheter electrode fixing part on the bottom plate, the catheters with various ring diameters and electrode quantity are connected, the testing operation difficulty is reduced, the testing time is shortened, and the testing error risk is reduced.

Description

Multi-electrode catheter testing device

Technical Field

The utility model relates to the technical field of interventional therapy, in particular to a multi-electrode catheter testing device.

Background

Medical catheters are widely used in various active medical devices, and functional and performance tests such as leakage current, discharge tests, electric signal acquisition and the like are required in the production and manufacturing processes; so as to ensure that the product meets the design requirement or the delivery quality requirement.

In particular, pulse ablation catheters similar to vascular interventional atrial fibrillation treatment or operation auxiliary potential mapping catheters belong to multi-electrode catheters for releasing or collecting electric signals, and because different focus areas have different shapes, the number of catheter ring diameters and the number of electrodes are different, and it is difficult to effectively test all electrode combinations with different numbers on different catheters by adopting a unified device.

At present, when testing different electrodes, a tester usually manually controls an electrode switch control box connected with the electrode switch control box, and manually opens or closes the switch to test, the number of the electrodes is large, the error is easy to occur when the test scheme is combined, especially when the positive and negative polarities of the electrical signals are tested by different electrodes are controlled more importantly, and the test equipment or the guide tube can be damaged when a large current is generated by careless short circuit.

Accordingly, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.

Disclosure of Invention

The present utility model is directed to a multi-electrode catheter testing device that solves or alleviates the above-mentioned problems of the prior art.

In order to achieve the above object, the present utility model provides the following technical solutions:

the utility model provides a multi-electrode catheter testing device, which comprises:

a bottom plate;

the bottom plate is provided with a plurality of catheter electrode fixing parts, and the catheter electrode fixing parts are used for fixing catheter electrodes;

the catheter electrode fixing part is connected with an electronic switch on the electrode switch board through a lead-out wire;

the electrode switch board is electrically connected with an electrode switch control panel, a plurality of control buttons are arranged on the electrode switch control panel, control signals are generated when different control buttons are pressed down, the control signals control the electronic switch to be closed, and one or more specified pairs of electrodes are conducted.

Preferably, the catheter electrode fixing part is in a clamping groove or pressing groove structure,

the multi-electrode catheter testing device further comprises a matched pressing plate, and the clamping groove or the pressing groove is matched with the matched pressing plate and used for fixing the catheter electrode.

Preferably, the number of the catheter-electrode fixing members is equal to or greater than the number of the catheter electrodes.

Preferably, the arrangement order of the lead wires of the catheter-electrode fixing part coincides with the arrangement order of the electrodes on the catheter.

Preferably, the catheter-electrode fixing part is adapted to the shape of the catheter electrode.

Preferably, the bottom plate is further provided with a first connection port and a second connection port, the first connection port is configured to be connected with a positive pole of an input/output test signal, and the second connection port is configured to be connected with a negative pole of the input/output test signal.

Preferably, the bottom plate is a solid plate of insulating material.

Preferably, the base plate is a sub-force gram plate.

Preferably, the catheter-electrode fixing member is made of a metal material.

Preferably, the control buttons are at least 3.

The beneficial effects are that:

the utility model provides a multi-electrode catheter testing device, which comprises a bottom plate; the bottom plate is provided with a plurality of catheter electrode fixing parts, and the catheter electrode fixing parts are used for fixing catheter electrodes; the catheter electrode fixing part is connected with an electronic switch on the electrode switch board through a wire; the electrode switch board is electrically connected with the electrode switch control panel, a plurality of control buttons are arranged on the electrode switch control panel, control signals are generated when different control buttons are pressed, the control signals control the electronic switch to be closed, and the appointed conduction of any pair or pairs of electrodes can be realized. The control button on the electrode switch control panel is used for sending a control signal to the electrode switch board, the opening/closing of the electronic switch is selected, the catheter electrode is fixed by arranging the catheter electrode fixing part on the bottom plate, the catheters with various ring diameters and electrode quantity are connected, the testing operation difficulty is reduced, the testing time is shortened, and the testing error risk is reduced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. Wherein:

FIG. 1 is a block diagram of a multi-electrode catheter testing device provided in accordance with some embodiments of the present utility model;

FIG. 2 is a schematic diagram of a catheter electrode in some embodiments;

fig. 3 is a schematic structural diagram of an electrode switch control panel according to some embodiments of the present utility model.

Reference numerals illustrate:

1-first connection port, 2-second connection port, 3-clamping groove, 31-first clamping groove, 32-second clamping groove, 33-third clamping groove, 34-fourth clamping groove, 7-electrode switch board, 8-electrode switch control panel, 100-bottom plate, 101-catheter head, 102-catheter inter-electrode insulating layer, 103-electrode on catheter.

Detailed Description

The utility model will be described in detail below with reference to the drawings in connection with embodiments. The examples are provided by way of explanation of the utility model and not limitation of the utility model. Indeed, it will be apparent to those skilled in the art that modifications and variations can be made in the present utility model without departing from the scope or spirit of the utility model. For example, features illustrated or described as part of one embodiment can be used on another embodiment to yield still a further embodiment. Accordingly, it is intended that the present utility model encompass such modifications and variations as fall within the scope of the appended claims and their equivalents.

In the following description, the terms "first/second/third" are used merely to distinguish between similar objects and do not represent a particular ordering of the objects, it being understood that the "first/second/third" may be interchanged with a particular order or precedence where allowed, to enable embodiments of the utility model described herein to be implemented in other than those illustrated or described herein.

In interventional therapy, a catheter is a tubular instrument that is used for manipulation and treatment inside the human body. Catheters are typically made of flexible materials with some ability to bend to allow for puncture, navigation and manipulation in blood vessels, catheters or other body lumens, and may be provided with electrodes for various functions such as electrical signal acquisition, electrical stimulation, resistance measurement, etc.

In order to adapt to the positions and shapes of different focuses, the shape of the catheter, the arrangement condition of the electrodes arranged on the catheter and the number of the electrodes are different. For example, some catheters employ a single electrode arrangement, i.e., a single electrode is affixed to the distal end or side of the catheter, which is suitable for a single signal acquisition or electrical stimulation task, e.g., in cardiac catheters, a single electrode may be used to measure the electrical signal of the heart or to provide electrical stimulation to restore a normal heart rhythm. For another example, some catheters employ a multi-electrode linear arrangement, i.e., electrodes on the catheter are arranged linearly and equidistant from each other, which is suitable for situations where multiple signals need to be acquired simultaneously or multi-channel electrical stimulation is performed, e.g., in a nerve stimulation catheter, multiple electrodes may be used to stimulate different nerve roots or regions. For another example, some catheters employ a multi-electrode annular arrangement, i.e., electrodes on the catheter are wrapped around the catheter to form one or more annular electrode arrays. This arrangement is suitable for applications requiring omnidirectional signal acquisition or electrical stimulation, for example, in cardiac catheters, annular electrode arrays may be used to record the omnidirectional electrical signals of the heart for more accurate diagnosis and treatment. Yet another possible arrangement is a spring-type electrode arrangement, i.e. the electrodes on the catheter are arranged in a spring-type arrangement, i.e. the electrodes can be contracted or expanded within the catheter.

Fig. 2 shows an example of the shape of a catheter electrode, which, as shown in fig. 2, is in the shape of a ring, comprising a catheter head 101, a catheter inter-electrode insulation layer 102 and an electrode 103 on the catheter, the catheter ring referring to the outer diameter of the ring-shaped catheter, the catheters of different outer diameters having different dimensions.

Because the shapes, the number of the electrodes and the arrangement modes of the electrodes of different catheters are different, the functions and the performance of the electrodes are tested by manually switching the electrodes in the existing production and manufacturing process, the operation difficulty is high, the efficiency is low, and errors are easy to occur.

Therefore, the embodiment of the utility model provides a multi-electrode catheter testing device, a plurality of catheter electrodes are fixed on a bottom plate 100 through catheter electrode fixing components, each catheter electrode fixing component is connected with an electronic switch on an electrode switch board 7 through a lead-out wire, the electrode switch board 7 is connected with an electrode switch control panel 8, a plurality of control buttons are arranged on the electrode switch control panel 8, each control button generates a control signal when pressed, the corresponding electronic switch is controlled to be closed through the control signal to realize the conduction of one or more pairs of pre-designated electrodes, and then the function and performance of the electrodes are judged according to the output signals generated after the conduction of the electrodes.

Examples

The multi-electrode catheter testing device provided by the embodiment of the utility model comprises: a base plate 100; the base plate 100 is provided with a plurality of catheter-electrode fixing members for fixing catheter electrodes; the catheter electrode fixing part is connected with an electronic switch on the electrode switch board 7 through a lead-out wire; the electrode switch board 7 is electrically connected with the electrode switch control panel 8, a plurality of control buttons are arranged on the electrode switch control panel 8, control signals are generated when different control buttons are pressed, the control signals control the electronic switch to be closed, one or more designated pairs of electrodes are conducted, the operation difficulty of multi-electrode catheter testing is reduced, and the testing efficiency is improved.

In the embodiment of the present utility model, the bottom plate 100 refers to a base platform or a bottom structure supporting the entire testing device, and the bottom plate 100 plays a role in supporting, fixing and assembling other components in the multi-electrode testing device. The base plate 100 may be rectangular, circular, or other shapes, and the specific shape of the base plate 100 is not limited in the embodiments of the present utility model.

In this embodiment, the base plate 100 is a solid, stable planar structure, and may be made of plastic or other materials with isolation so that the base plate 100 can prevent the propagation of interference signals or power supply noise.

Preferably, the base plate 100 is a solid plate of insulating material. Since the insulating material solid plate has good insulating property, current can be effectively isolated and current conduction can be prevented, so that the bottom plate 100 has excellent insulating property, cannot become a current path, and reduces the risks of electric leakage and electric interference. Secondly, the use of the solid plate of insulating material as the base plate 100 can improve the safety of the apparatus, i.e. the insulating material increases the safety of the base plate 100, can prevent current from flowing through the base plate 100 to other components or contact points, reduces the risk of electric shock to personnel, and ensures the safety of operators. Again, the solid plate of insulating material enables the base plate 100 to be electrically isolated, prevents conduction and interference of current, helps to maintain the purity of the test signal, and improves the accuracy and reliability of the electrode test device. The solid plate of material can also provide the interference immunity of certain degree, can prevent outside electromagnetic field to electrode testing arrangement's influence, reduce interference signal's interference, ensure the accuracy of test result. Finally, since the solid plate of insulating material generally has good durability and stability, it is not easily damaged, which makes maintenance and repair of the base plate 100 more convenient, and also prolongs the service life of the electrode test device. In this embodiment, the insulating material may be: polyurethane, polyimide, polytetrafluoroethylene, glass fiber reinforced plastic, or high density polyethylene.

Further, the base plate 100 is a sub-dak plate. The sub-force gram plate is taken as a special insulating material solid plate, has excellent insulating performance, can effectively isolate current and prevent electric leakage, and has the insulating characteristics capable of meeting the requirements under high voltage and high current environments and ensuring electrical safety; meanwhile, the inferior force gram plate has high mechanical strength and rigidity, can bear larger pressure and force, has good durability and stability in application, is not easy to deform or damage, is easy to process and manufacture, and can be subjected to cutting, drilling, punching and other processing operations according to specific requirements. Compared with other insulating material solid plates, the present embodiment preferably uses the sub-force plate as the material of the base plate 100 because the sub-force plate has the characteristics of high insulating property, excellent mechanical strength, high temperature resistance, good chemical stability, excellent workability, and the like.

In some possible embodiments, the backplane 100 may be provided with wire-receiving through-holes, slots, or wire-grooves, which may be multiple, to provide routing and connecting channels and spaces for the multi-electrode test device.

In other possible implementations, to help dissipate heat, and ensure stable operation of the electrode testing device, a heat sink or heat sink may also be mounted to the base plate 100 to prevent overheating of the device during multi-electrode testing.

In this embodiment, the base plate 100 is provided with a plurality of catheter-electrode fixing members for fixing catheter electrodes. The catheter electrode fixing component can adopt specific structures such as clamping fixing or clamping groove/pressing groove fixing.

In particular, when the catheter-electrode-fixing member is a clamp-fixing member, a plurality of clamping devices (referred to as test clamps) may be designed on the base plate 100 to fix the electrode to the base plate 100 so that the electrode is fixed and kept stable. To accommodate electrodes of different sizes and shapes, the clamping device may preferably be designed as a spring clip with an adjustable clamping force to ensure stability and connectivity of the clamping device in contact with the electrode.

However, when the clamping device of the test clamp is used for fixing the electrode, even if the test clamp has a spring structure to maintain the clamping force, the test clamp is easy to fall off and has poor contact with the electrode in practical application, and therefore, in the embodiment of the utility model, the catheter electrode fixing component is of a clamping groove 3 or a pressing groove structure, and the multi-electrode catheter testing device further comprises a matched pressing plate, and the clamping groove 3 or the pressing groove is matched with the matched pressing plate for fixing the catheter electrode.

The clamping groove 3 can be of a groove-shaped structure with a hollow middle, and the pressing groove can be of a groove or a grooving structure.

In some embodiments, the catheter-electrode-securing component is adapted to the shape of the catheter electrode. That is, the shape and size of the clamping groove 3 or the pressing groove can be designed to be matched with those of the catheter electrode, for example, when the catheter electrode is in a circular shape, the clamping groove 3 or the pressing groove can be designed to be matched with the outer diameter of different catheter electrodes, so that the electrode can be firmly fixed in the testing device, the movement or looseness of the catheter electrode is reduced, and the stable testing environment and reliable testing result can be ensured.

In order to further ensure a stable mounting and reliable connection of the electrodes, the test device further comprises a mating pressure plate, which is a pressure plate or clamping means for fixing the electrodes, the shape of which is adapted to the clamping groove 3 or the pressure groove, is usually mounted above the catheter electrode and applies pressure via the fixing means to firmly fix the catheter electrode in the clamping groove 3 or the pressure groove.

In some embodiments, to ensure good contact with and not damage the electrodes of the various numbers, the catheter-electrode-fixing component is made of a metallic material, such as copper, tin-plated copper, or the like. That is, the material of the card slot 3 or the pressing slot may be set to a metal material, or a metal coating may be coated on the inner side of the card slot 3 or the pressing slot. Because the catheter electrode fixing part is matched with the shape of the catheter electrode, the electrode on the catheter can be fully contacted with the metal material of the catheter electrode fixing part, so that good conductivity is realized.

Because the electrode test process needs to connect the test input and output signals to the electrode, if the electrode is fixed by adopting a traditional test clamp, poor contact is easy to occur, and electric spark is generated or the test error is large; in addition, the catheter electrode is generally made of noble metal, soft and easy to damage the shape of the electrode due to clamping; the clamp is loose and easy to fall off; the number of the electrodes of different rings of the transcatheter is different; each electrode is to be tested; therefore, in this embodiment, the catheter electrode fixing component is a clamping groove 3 or a pressing groove structure made of metal materials, and is used for receiving and fixing the catheter electrode, so as to ensure the fastening and fixing of the catheter electrode, and the clamping grooves 3 with different diameters matched with the catheter electrode are adopted to fix the catheter electrode, so that the electrode on the catheter can be effectively protected, meanwhile, good contact of the electrode is ensured, and a better test effect is realized.

The number of the catheter electrode fixing parts is greater than or equal to the number of the catheter electrodes, specifically, the catheter electrode fixing parts are in a clamping groove 3 structure, and the clamping groove 3 can be one or more, so that a multi-electrode catheter can be connected into the testing device to test all electrodes of the multiple catheters simultaneously.

Fig. 1 shows an exemplary structure of a test device according to the present utility model, referring to fig. 1, there are a plurality of catheter-electrode fixing slots 3, in this example, four slots 3, namely, a first slot 31, a second slot 32, a third slot 33, and a fourth slot 34, each slot 3 being capable of receiving one catheter-electrode. It should be understood that the number of the card slots 3 may be other, and the number of the card slots 3 is equal to or greater than the number of the catheter electrodes.

In some embodiments, the plurality of card slots 3 may be linearly arranged and uniformly distributed on the base plate 100 to fully utilize the space of the base plate 100.

In some embodiments, the lead wires of the catheter-electrode-fixation device are arranged in a sequence that corresponds to the sequence of electrodes. That is, the electrode fixing grooves 3 made of metal sequentially draw out wires to the electrode switch plate 7, and the arrangement order of the electrodes corresponding to the electrode fixing grooves 3 is uniform.

In this embodiment, the multi-electrode catheter testing device further includes an electrode switch board 7, and the card slot 3 may be connected to an electronic switch on the electrode switch board 7 through a wire. Specifically, a lead (such as a flat cable in fig. 1) may be led from each card slot 3 to the electrode switch board 7 and connected to the corresponding electronic switch.

In this embodiment, the lead-out wires of each card slot 3 are flat cables, each flat cable is composed of a plurality of thin wires or cables, and the plurality of thin wires or cables are woven, insulated or wrapped together to form an integral harness for transmitting the electrical signals generated by the plurality of electrodes.

The electrode switch board 7 is used for controlling the state of the electronic switch, the electrode switch board 7 usually consists of a plurality of electronic switches and corresponding circuits, the electronic switches on the board can be used for switching the connection or disconnection of the electrodes to achieve different functions or operation modes.

The electrode switch plate 7 may comprise a plurality of electronic switches, each of which is connected to a corresponding one of the card slots 3 to be connected to a corresponding one of the electrodes, i.e. each of the conduit electrodes is connected to a corresponding electronic switch on the electrode switch plate 7 via a wire led out of the card slot 3.

Each electronic switch has two states, namely an on or off state, and a change in the state of the switch will result in a change in the state of communication of the corresponding circuit in the circuit, thereby controlling the connection or disconnection of the electrodes.

Further, the electronic switch may be a single pole double throw switch or an independent switch. When the electronic switch is an independent switch, the connection between the electrode and the electronic switch is set to be a structure that one electrode is correspondingly connected with two independent switches.

In this embodiment the electrode switch board 7 is provided with a connection interface for connection to other devices or systems while making electrical connection with the electrode switch control panel 8. The connection interface may be a plug, a socket, a lead, a flat cable, or other customized connection modes, which is not limited in the embodiment of the present utility model.

As shown in fig. 3, the electrode switch control panel 8 is provided with a plurality of control buttons, a control button driving circuit, an MCU (micro controller unit) main control circuit and a power supply, and when different control buttons are pressed, control signals are generated, and the control signals control the electronic switch to be closed, so that any pair or pairs of electrodes are conducted.

The MCU main control circuit is used for identifying different control signals according to different states of the control signals after receiving the control signals which are operated by a user and are output by the control buttons; then outputting corresponding control signals to the electrode switch plates, wherein one ends of the switches on the motor switch plates are correspondingly connected with the electrodes on the guide tubes one by one; the other end is connected with the test input/output signal, and the connection of the electrode and the test input/output signal can be controlled by the control signal.

Specifically, the control buttons are physical buttons used by a user to control the state of the electronic switch, control signals are generated when different control buttons are pressed or released, and the connection or disconnection states of the electronic switch at different positions can be changed by pressing or releasing different buttons, so that one or more pairs of pre-designated electrodes are connected or disconnected. For example, when the control signal is at a high level, the electronic switch is turned on, and the electrodes are connected; when the control signal is low, the switch is turned off and the electrode is turned off. That is, the electronic switch controls the on-off of the switch and the on-off connection position through the electrode switch control panel 8 so that the specified electrode or electrodes are turned on.

It should be appreciated that MCUs typically have a plurality of input/output pins for receiving and detecting external input control signals, or outputting control signals to the outside. The pins can receive level signals from externally connected switches, buttons or other control devices, the MCU can judge whether the state of the control signals is high level or low level by reading the states of the pins, and then the corresponding control signals are output to the electrode switch board according to the high level/low level states so as to conduct different pre-designated electronic switches. Therefore, the MCU main control circuit receives the control signals generated by the control buttons and outputs corresponding control signals to the electrode switch board, so that the electronic switch is opened/closed, and finally, the circuit is conducted.

Preferably, there are at least 3 control buttons, each of which is assigned a certain function, that is, different control buttons correspond to different control signals and have different functions, which enable connection selection of a pre-designated pair of electrodes or connection selection of a plurality of pairs of electrodes.

In the traditional technical scheme, the electrode connecting switch is directly manually stirred by people in medical catheter research and development or delivery, the operation of the testing process is complex, the multi-electrode catheter testing device provided by the embodiment can be connected with catheters with various loops and electrode quantity through different catheter electrode fixing clamping grooves 3, and different connecting modes can be set through an electrode switch control panel 8. The catheter electrode fixing clamping groove 3 can provide good contact of electrode connection areas, reduces the difficulty of test operation, shortens the test time and reduces the risk of test errors.

In some embodiments, the backplane 100 is further provided with connection ports for testing input/output signals, namely a first connection port 1 and a second connection port 2, for connecting input/output test signals, wherein the first connection port 1 is configured to connect with a positive pole of the input/output test signals, and the second connection port 2 is configured to connect with a negative pole of the input/output test signals.

When in use, each multi-electrode of the conduit to be tested is fixedly connected with each conduit electrode fixing part in sequence, then the test signals are accessed through the connection ports of the test input/output signals on the bottom plate 100 according to the test requirement, the conduits with various rings and electrode numbers are connected by pressing or releasing different control buttons on the electrode switch control panel 8, and the corresponding test output signals are recorded and analyzed to determine the electrode function and performance parameters of the conduit.

In summary, according to the technical problem that the current catheter needs to be manually connected with test equipment and electrodes in research and development or factory test, the test process is complex in operation and easy to go out of errors, an operator needs to continuously adjust a connection mode to complete the test, the test time is long, and the error risk of a test result is increased.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A multi-electrode catheter testing device, comprising:

a bottom plate;

the electrode switch board is electrically connected with an electrode switch control panel, a plurality of control buttons are arranged on the electrode switch control panel, control signals are generated when different control buttons are pressed down, and the control signals control the electronic switch to be closed, so that one or more specified pairs of electrodes are conducted.

2. The test device of claim 1, wherein the test device comprises a plurality of test elements,

the catheter electrode fixing part is of a clamping groove or pressing groove structure,

3. The test device according to claim 1 or 2, wherein the number of the catheter-electrode fixing members is equal to or greater than the number of the catheter electrodes.

4. A test device according to claim 3, wherein the arrangement of the lead wires of the catheter-electrode-fixing member coincides with the arrangement of the electrodes.

5. A test device according to claim 3, wherein the catheter electrode securing means is adapted to the shape of the catheter electrode.

6. The test device of claim 1, wherein the base plate is further provided with a first connection port configured to connect to a positive pole of an input/output test signal and a second connection port configured to connect to a negative pole of the input/output test signal.

7. The test device according to any one of claims 1 to 6, wherein,

the bottom plate is an insulating material solid plate.

8. The test device of any one of claims 1 to 6, wherein the base plate is a sub-dak plate.

9. The test device of claim 7 or 8, wherein the catheter-electrode-securing member is a metallic material.

10. The test device of claim 9, wherein there are at least 3 control buttons.