Electrocardiogram chest lead electrode slice connecting structure

Abstract

The utility model relates to the technical field of medical instruments, and discloses an electrocardiogram chest lead electrode slice connecting structure which comprises an electrode slice body, a connecting seat and a lead head, the connecting seat comprises a connecting ring, a fixing piece and a reset spring, the connecting ring is conductively connected with the electrode slice body, the connecting ring is provided with a center hole, and the side wall of the connecting ring is further provided with an assembly hole. The fixing piece is rotationally assembled in the assembling hole and comprises an inner fixing arm, the inner fixing arm is located on the side, close to the electrode plate body, of the rotating center line of the fixing piece, and the reset spring is connected between the connecting ring and the fixing piece; the lead head comprises a conductive column, the outer wall of the conductive column is provided with a jack, and the inner fixing arm is inserted into the jack along the radial direction of the fixing ring. When the lead wire is pulled to be separated from the center hole of the connecting ring, the fixing piece rotates to enable the inner fixing arm to be close to the rotating center line of the fixing piece, at the moment, the inner fixing arm can prevent the lead head from being separated from the connecting ring, and therefore the lead wire is prevented from being torn off, and the stability of electrocardiogram signal collection is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to an electrocardiogram chest lead electrode piece connection structure. Background Art

[0002] The chest lead electrodes used in the rapid electrocardiographs currently commonly used in clinical practice are trumpet-shaped suction-ball chest lead electrodes, which are composed of a rubber airbag and a metal suction cup with an intubation tube. When in use, the airbag is squeezed to generate vacuum negative pressure and the metal suction cup is attached to the human skin. Usually, the electrode can be firmly attached to the chest skin until the electrocardiogram test is completed.

[0003] For critically ill patients with thin bodies, poor skin elasticity, and a lack of surface fat, such as those with cirrhosis or end-stage renal disease, rapid and stable ECG data collection using existing suction-ball chest lead electrodes is extremely difficult. Due to the lack of surface fat, even after the chest lead ball electrodes are properly positioned, they can leak due to the skin's inability to maintain tight contact, making them a common cause of electrode detachment in these patients. Furthermore, their structural design minimizes contact with the skin, generating significant negative pressure, which can cause noticeable bruising when the suction cup is lifted.

[0004] The patent with authorization announcement number CN205626718U discloses a physical therapy electrode sheet for low-frequency electrotherapy. It has a layered structure, including a low-frequency current access terminal, a conductive layer, an insulating non-woven fabric, a carbon fiber cloth, a superconducting layer, and a hydrogel arranged in sequence from top to bottom. The insulating non-woven fabric, the carbon fiber cloth, and the superconducting layer are all provided with small holes in the middle. After the low-frequency current access terminal is fixedly connected to the conductive layer, it passes through the small hole and is bonded together by the hydrogel. The hydrogel is in direct contact with human skin, and the area of the superconducting layer is smaller than that of the insulating non-woven fabric and the carbon fiber cloth.

[0005] The above-mentioned therapy electrode sheet is provided with a hydrogel at the bottom side so that the hydrogel is in direct contact with the human skin. The hydrogel has good adhesion to maintain good contact with the patient's skin, thus preventing the electrode sheet from falling off the patient's skin. However, the above-mentioned therapy electrode sheet adopts a magnetic buckle connection structure, and the current access end of the electrode sheet is magnetically fixed to the magnet in the magnetic buckle wire. After the magnetic buckle structure is connected, if the patient moves or people walk and pull the lead wire, the external force will tear off the lead wire, causing the electrode sheet to be disconnected from the electrocardiogram machine, affecting the electrocardiogram signal acquisition. Utility Model Content

[0006] The purpose of the utility model is to provide an electrocardiogram chest lead electrode piece connection structure to solve the problem in the prior art that the electrode pieces adopt a magnetic buckle structure to connect and the lead wires may be torn off by external forces.

[0007] In order to achieve the above-mentioned object, the utility model provides an electrocardiogram chest lead electrode piece connection structure, comprising an electrode piece body, a connecting seat and a lead head, wherein the connecting seat is fixedly connected to the electrode piece body, the connecting seat comprises a connecting ring, a fixing plate and a reset spring, the connecting ring is conductively connected to the electrode piece body, the connecting ring has a center hole, the side wall of the connecting ring further has an assembly hole, the fixing plate is rotatably assembled in the assembly hole, the rotation center line of the fixing plate is perpendicular to the central axis of the connecting ring, the fixing plate comprises an inner fixing arm located in the center hole, the inner fixing arm is located on the side of the rotation center line of the fixing plate close to the electrode piece body, the reset spring is connected between the connecting ring and the fixing plate, and the reset spring is used to apply a force to the fixing plate to rotate the inner fixing arm toward the center hole;

[0008] The lead head includes a conductive column, which is used to be inserted into the central hole. The outer wall of the conductive column has an insertion hole, and the inner fixing arm is used to be inserted into the insertion hole along the radial direction of the connecting ring.

[0009] Preferably, the fixing plate also includes a connecting arm, which is rotatably assembled in the assembly hole, the bottom end of the connecting arm is located in the center hole, the bottom end of the connecting arm is fixedly connected to the inner fixed arm, and the reset spring is connected between the connecting ring and the connecting arm.

[0010] Preferably, the fixing plate further includes a handle, the top end of the connecting arm is located outside the connecting ring, the top end of the connecting arm is fixedly connected to the handle, and the reset spring is fixedly connected to the top end of the connecting arm.

[0011] Preferably, the handle and the internal fixation arm are parallel to each other.

[0012] Preferably, the jack includes a first hole wall and a second hole wall, the first hole wall is connected to the bottom side of the second hole wall, the first hole wall extends radially along the conductive column, and the hole side of the second hole wall extends away from the first hole wall.

[0013] Preferably, the electrode sheet body includes a hydrogel layer and an electrical isolation layer arranged in layers, the hydrogel layer is located at the bottom of the electrical isolation layer to contact the patient's skin, the connecting ring is embedded in the electrical isolation layer, and the bottom of the connecting ring is electrically connected to the hydrogel layer.

[0014] Preferably, the electrical isolation layer is a non-woven fabric layer.

[0015] Preferably, the lead head further includes a head end connecting portion and a lead wire, the conductive post is fixedly connected to the head end connecting portion, and the lead wire is electrically connected to the conductive post.

[0016] Compared with the prior art, the electrocardiogram chest lead electrode patch connection structure of the embodiment of the present invention has the following beneficial effects: the fixing plate is rotatably assembled on the connecting ring of the connecting seat, and the conductive post of the lead head is inserted into the center hole of the connecting ring. Under the action of the elastic force of the reset spring, the internal fixing arm can be inserted into the jack on the conductive post along the radial direction of the connecting ring. Since the internal fixing arm is located on the side of the rotation center line of the fixing plate close to the electrode patch body, when the lead wire is pulled and wants to be separated from the center hole of the connecting ring, the conductive post pulls the fixing plate through the internal fixing arm, and the fixing plate rotates so that the internal fixing arm approaches the rotation center line of the fixing plate. At this time, the internal fixing arm can prevent the lead head from being separated from the connecting ring, thereby avoiding the lead wire from being torn off and ensuring the stability of electrocardiogram signal acquisition. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural diagram of the electrode body and the connection seat of the electrocardiogram chest lead electrode connection structure of the utility model;

[0018] Figure 2 yes Figure 1 An enlarged schematic diagram of the structure of the electrocardiogram chest lead electrode connection structure at A;

[0019] Figure 3 yes Figure 1 A top view of the connection structure of the electrocardiogram chest lead electrode;

[0020] Figure 4 This is a structural schematic diagram of the lead head of the electrocardiogram chest lead electrode connection structure of the present invention;

[0021] Figure 5 This is a schematic diagram of the electrocardiogram chest lead electrode connection structure of the present invention in a state where the lead head and the connection base are not connected;

[0022] Figure 6 This is a schematic diagram of the state in which the return spring is compressed when the lead head of the electrocardiogram chest lead electrode connection structure of the present invention is inserted into the center hole;

[0023] Figure 7 The utility model is a schematic diagram of the state of the reset spring after the lead head and the connection base of the electrocardiogram chest lead electrode piece connection structure are connected.

[0024] In the figure, 1. electrode sheet body, 11. hydrogel layer, 12. electrical isolation layer, 2. connecting seat, 21. connecting ring, 211. center hole, 212. assembly hole, 22. fixing plate, 221. internal fixing arm, 222. connecting arm, 223. handle, 224. rotating shaft, 23. reset spring, 3. lead head, 31. conductive column, 32. jack, 321. first hole wall, 322. second hole wall, 33. head end connecting part, 34. lead wire. DETAILED DESCRIPTION

[0025] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0026] A preferred embodiment of the electrocardiogram chest lead electrode connection structure of the utility model is as follows: Figures 1 to 4 As shown, the electrocardiogram chest lead electrode connection structure includes an electrode body 1, a connecting base 2 and a lead head 3. The electrode body 1 is used to be pasted on the patient's skin to collect electrical signals. The connecting base 2 is used to be fixed on the electrode body 1 and connected to the lead head 3 to realize the transmission of electrical signals between the lead head 3 and the electrode body 1. The lead head 3 is used to connect to the electrocardiogram machine.

[0027] The connector 2 includes a connecting ring 21, a fixing plate 22, and a return spring 23. The connecting ring 21 is fixedly mounted in the center of the electrode body 1 and electrically connected to the electrode body 1 to enable electrical signal transmission. The connecting ring 21 has a central hole 211. The diameter of the central hole 211 is slightly larger than the outer diameter of the conductive post 31, allowing the lead head 3 to be slightly adjusted within the central hole 211. In this embodiment, the inner wall of the connecting ring 21 is a metal structure, and the central hole 211 is used to mount the lead head 3, allowing electrical signals to be transmitted between the electrode body 1 and the lead head 3.

[0028] The sidewall of the connecting ring 21 further defines an assembly hole 212, and the fixing plate 22 further defines a rotating shaft 224. Both ends of the rotating shaft 224 are embedded in the walls of the assembly hole 212, and the fixing plate 22 is rotatably assembled within the assembly hole 212 via the rotating shaft 224. The rotating shaft 224 extends horizontally, such that the rotational centerline of the fixing plate 22 is perpendicular to the central axis of the connecting ring 21. The fixing plate 22 can rotate up and down within the assembly hole 212 to a certain degree, thereby changing the angle of the fixing plate 22.

[0029] The fixing plate 22 includes an internal fixing arm 221, which is located within the center hole 211 of the connecting ring 21. That is, when the fixing plate 22 and the connecting ring 21 are assembled, the internal fixing arm 221 is located inside the connecting ring 21. The internal fixing arm 221 is located on the side of the fixing plate 22's rotational centerline that is closest to the electrode plate body 1. That is, when the electrode plate body 1 is attached to the patient, the internal fixing arm 221 is located below the fixing plate 22's rotational centerline, preventing the internal fixing arm 221 from being pulled outward.

[0030] The return spring 23 is assembled between the connecting ring 21 and the fixing plate 22. The return spring 23 is used to apply a force to the fixing plate 22 to rotate the inner fixing arm 221 toward the center hole 211. That is, in the absence of external force, the return spring 23 drives the fixing plate 22 to rotate, so that the inner fixing arm 221 is lifted upward and swings toward the direction of the center hole 211, ensuring a stable connection between the inner fixing arm 221 and the lead head 3, so that the fixing plate 22 is automatically reset.

[0031] The lead head 3 includes a conductive post 31, which is inserted into the center hole 211 along the central axis of the connecting ring 21. The outer wall of the conductive post 31 also has a socket 32. When the conductive post 31 is inserted into the center hole 211 of the connecting ring 21, the socket 32 is inserted toward the assembly hole 212 of the connecting ring 21. The conductive post 31 pushes the internal fixing arm 221 to swing downward. When the internal fixing arm 221 is aligned with the socket 32, the elastic force of the return spring 23 returns the fixing plate 22 to its original position, and the internal fixing arm 221 is inserted into the socket 32, completing the fixed connection between the connector 2 and the lead head 3.

[0032] The fixing plate 22 is rotatably assembled on the connecting ring 21 of the connecting base 2 of the electrocardiogram chest lead electrode connection structure, and the conductive column 31 of the lead head 3 is inserted into the center hole 211 of the connecting ring 21. Under the action of the elastic force of the reset spring 23, the internal fixing arm 221 can be inserted into the socket 32 on the conductive column 31 along the radial direction of the connecting ring 21. Since the internal fixing arm 221 is located on the side of the rotation center line of the fixing plate 22 close to the electrode plate body 1, when the lead wire 34 is pulled and wants to be separated from the center hole 211 of the connecting ring 21, the conductive column 31 pulls the fixing plate 22 through the internal fixing arm 221, and the fixing plate 22 rotates so that the internal fixing arm 221 approaches the rotation center line of the fixing plate 22. At this time, the internal fixing arm 221 can prevent the lead head 3 from being separated from the connecting ring 21, thereby avoiding the lead wire 34 from being torn off, thereby ensuring the stability of electrocardiogram signal acquisition.

[0033] Preferably, the fixing plate 22 also includes a connecting arm 222, which is rotatably assembled in the assembly hole 212, the bottom end of the connecting arm 222 is located in the center hole 211, the bottom end of the connecting arm 222 is fixedly connected to the inner fixed arm 221, and the return spring 23 is connected between the connecting ring 21 and the connecting arm 222.

[0034] The fixing plate 22 has a connecting arm 222. In this embodiment, a rotating shaft 224 is fixedly connected to the connecting arm 222, allowing the connecting arm 222 to be rotatably assembled within the assembly hole 212. An included angle is formed between the inner fixing arm 221 and the connecting arm 222. The connecting arm 222 allows the inner fixing arm 221 to form the free end of the fixing plate 22, allowing for some deformation as the fixing plate 22 swings up and down. This ensures that the lead head 3 can pass through the area of the inner fixing arm 221 when entering the center hole 211 and connect with the connecting ring 21.

[0035] Preferably, the fixing plate 22 further includes a handle 223 , the top end of the connecting arm 222 is located outside the connecting ring 21 , the top end of the connecting arm 222 is fixedly connected to the handle 223 , and the return spring 23 is fixedly connected to the top end of the connecting arm 222 .

[0036] The middle portion of the connecting arm 222 is fixedly connected to the rotating shaft 224 and rotatably assembled within the assembly hole 212. The handle 223 and the inner fixed arm 221 are located at either end of the connecting arm 222. When the lead head 3 is connected to the connector 2, the operator can use the handle 223 to move the fixed plate 22, allowing the top end of the connecting arm 222 to enter the assembly hole 212 and leave a gap in the center hole 211, facilitating the insertion of the conductive post 31 into the center hole 211 of the connecting ring 21. A return spring 23 is fixedly connected to the top end of the connecting arm 222, increasing the moment arm. When the external force is removed, the return spring 23 pushes the fixed plate 22 back into its original position.

[0037] Preferably, the handle 223 and the internal fixation arm 221 are parallel to each other.

[0038] After the handle 223 is parallel to the internal fixation arm 221 , the direction of the internal fixation arm 221 connected to the socket 32 can be determined by the direction of the handle 223 , making it easier for medical personnel to determine the connection status between the internal fixation arm 221 and the socket 32 .

[0039] Preferably, the jack 32 includes a first hole wall 321 and a second hole wall 322 , the first hole wall 321 is connected to the bottom side of the second hole wall 322 , the first hole wall 321 extends radially along the conductive column 31 , and the hole opening side of the second hole wall 322 extends away from the first hole wall 321 .

[0040] The opening of the second hole wall 322 of the jack 32 extends laterally away from the first hole wall 321, forming a V-shaped structure between the first and second hole walls 321 and 322. To detach the lead head 3 from the connector 2, the operator uses the handle 223 to move the fixing plate 22. The internal fixing arm 221 swings along an arc-shaped path. The opening of the second hole wall 322 is tilted downward, guiding the internal fixing arm 221 and reducing resistance to its swing.

[0041] Preferably, the electrode sheet body 1 includes a hydrogel layer 11 and an electrical isolation layer 12 arranged in a stacked manner, the hydrogel layer 11 is located at the bottom of the electrical isolation layer 12 to contact the patient's skin, the connecting ring 21 is embedded in the electrical isolation layer 12, and the bottom of the connecting ring 21 is electrically connected to the hydrogel layer 11.

[0042] An electrical isolation layer 12 is arranged on the hydrogel layer 11. The electrical isolation layer 12 can insulate and isolate signal interference outside the hydrogel layer 11 to avoid affecting the acquisition of electrical signals. The hydrogel layer 11 contacts the patient's skin. Since the hydrogel itself has excellent adhesion and ductility, it can fit well on the skin and is not easy to fall off. Therefore, it is designed as the part that contacts the patient's skin. It is not only suitable for examinations of normal people, but also can well fix the electrode sheet body 1 for thin and fat-deficient patients in the end stage of liver cirrhosis and end-stage renal disease, preventing them from falling off, thereby improving work efficiency. At the same time, it does not require the use of negative pressure suction for fixation, and can be directly adhered to the skin, so it will not cause skin pain or bruising. The hydrogel has no obvious immunogenic reaction and toxic side effects, is safe and non-toxic, and basically does not cause allergies when in contact with human skin.

[0043] A hydrogel material is a mixture of a porous, permeable solid and at least 10% by weight or volume of interstitial fluid, which is composed entirely or primarily of water. The porous structure of the hydrogel enables water molecules to freely pass through the polymer network, making it possible to prepare a conductive hydrogel. In addition to its excellent conductivity, the hydrogel also has good adhesion, transparency, ductility, self-healing properties and biocompatibility, and can be conveniently used in clinical work for the rapid collection of patient surface electrocardiograms. In addition, conductive ions such as lithium chloride or compounds such as a mixture can be added to the hydrogel to enhance its ability to conduct electrical signals.

[0044] Connecting ring 21 is embedded in electrical isolation layer 12 and electrically connected to hydrogel layer 11 at its bottom end. Electrical signals collected by hydrogel layer 11 can be transmitted to connecting ring 21, completing electrocardiogram signal acquisition. In this embodiment, the connections between hydrogel layer 11, electrical isolation layer 12, and connecting ring 21 are all bonded together using 3M adhesive. The 3M adhesive is conductive and ensures electrical connection between the hydrogel layer 11 and connecting ring 21. The hydrogel layer 11 can transmit the collected electrical signals to the interconnected connecting ring 21, and from there to the conductive pillars 31.

[0045] Preferably, the electrical isolation layer 12 is a non-woven fabric layer.

[0046] Non-woven fabrics are commonly used medical materials that ensure electrical isolation while being low-cost.

[0047] Preferably, the lead head 3 further includes a head end connection portion 33 and a lead wire 34 . The conductive post 31 is fixedly connected to the head end connection portion 33 , and the lead wire 34 is electrically connected to the conductive post 31 .

[0048] After the head end connection part 33, the conductive column 31 and the lead wire 34 are connected, the electrical signal can be transmitted to an external electrocardiograph through the lead wire 34 to realize electrocardiogram signal collection.

[0049] The working process of the electrocardiogram chest lead electrode connection structure of the utility model is as follows: Figure 5 As shown, initially, the lead head 3 is ready to be inserted into the center hole 211 of the connecting ring 21 for connection and fixation, and the fixing piece 22 is in the initial state; Figure 6 As shown, the medical staff applies an external force to the handle 223, and the connecting arm 222 of the fixing plate 22 overcomes the elastic force of the return spring 23 and moves online. The connecting arm 222 rotates around the rotating shaft 224 and the part of the connecting arm 222 located outside the connecting ring 21 rotates and retreats into the assembly hole 212. The conductive post 31 of the lead head 3 enters the central hole 211 of the connecting ring 21 and passes through the area where the fixing plate 22 is located; Figure 7 As shown, after the conductive column 31 is completely inserted into the connecting ring 21, the force on the handle 223 is removed, and the fixing plate 22 automatically rebounds to the initial position under the elastic force of the reset spring 23. At this time, the inner fixing arm 221 of the fixing plate 22 is inserted into the socket 32 and is in a completely fixed state. The fixation is completed, the lead head 3 is connected to the connecting seat 2, and the electrocardiogram signal can be collected.

[0050] In summary, the embodiment of the present invention provides an electrocardiogram chest lead electrode patch connection structure, in which a fixing plate is rotatably assembled on the connecting ring of the connecting seat, and the conductive post of the lead head is inserted into the center hole of the connecting ring. Under the action of the elastic force of the reset spring, the internal fixing arm can be inserted into the jack on the conductive post along the radial direction of the connecting ring. Since the internal fixing arm is located on the side of the rotation center line of the fixing plate close to the electrode plate body, when the lead wire is pulled and is about to be separated from the center hole of the connecting ring, the conductive post pulls the fixing plate through the internal fixing arm, and the fixing plate rotates so that the internal fixing arm approaches the rotation center line of the fixing plate. At this time, the internal fixing arm can prevent the lead head from being separated from the connecting ring, thereby avoiding the lead wire from being torn off and ensuring the stability of electrocardiogram signal acquisition.

[0051] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and replacements can be made without departing from the technical principles of the present invention. These improvements and replacements should also be regarded as the scope of protection of the present invention.

Claims

1. An electrocardiogram chest lead electrode connection structure, characterized in that: The invention comprises an electrode sheet body (1), a connecting seat (2) and a lead head (3), wherein the connecting seat (2) is fixedly connected to the electrode sheet body (1), the connecting seat (2) comprises a connecting ring (21), a fixing plate (22) and a reset spring (23), the connecting ring (21) is conductively connected to the electrode sheet body (1), the connecting ring (21) has a central hole (211), the side wall of the connecting ring (21) also has an assembly hole (212), the fixing plate (22) is rotatably assembled in the assembly hole (212), and the fixing plate (22) is The rotation centerline is perpendicular to the central axis of the connecting ring (21); the fixing plate (22) includes an inner fixing arm (221) located in the center hole (211); the inner fixing arm (221) is located on a side of the rotation centerline of the fixing plate (22) close to the electrode plate body (1); the reset spring (23) is connected between the connecting ring (21) and the fixing plate (22); the reset spring (23) is used to apply a force to the fixing plate (22) to rotate the inner fixing arm (221) toward the center hole (211); The lead head (3) comprises a conductive column (31), the conductive column (31) is used to be inserted into the central hole (211), the outer wall of the conductive column (31) has a socket (32), and the inner fixing arm (221) is used to be inserted into the socket (32) along the radial direction of the connecting ring (21).

2. The electrocardiogram chest lead electrode connection structure according to claim 1, characterized in that: The fixing plate (22) further includes a connecting arm (222), the connecting arm (222) being rotatably assembled in the assembly hole (212), the bottom end of the connecting arm (222) being located in the center hole (211), the bottom end of the connecting arm (222) being fixedly connected to the inner fixing arm (221), and the return spring (23) being connected between the connecting ring (21) and the connecting arm (222).

3. The electrocardiogram chest lead electrode connection structure according to claim 2, characterized in that: The fixing plate (22) further includes a handle (223), the top end of the connecting arm (222) is located outside the connecting ring (21), the top end of the connecting arm (222) is fixedly connected to the handle (223), and the return spring (23) is fixedly connected to the top end of the connecting arm (222).

4. The electrocardiogram chest lead electrode connection structure according to claim 3, characterized in that: The handle (223) and the inner fixing arm (221) are parallel to each other.

5. The electrocardiogram chest lead electrode connection structure according to any one of claims 1 to 4, characterized in that: The insertion hole (32) comprises a first hole wall (321) and a second hole wall (322), wherein the first hole wall (321) is connected to the bottom side of the second hole wall (322), the first hole wall (321) extends radially along the conductive column (31), and the hole opening side of the second hole wall (322) extends in a direction away from the first hole wall (321).

6. The electrocardiogram chest lead electrode connection structure according to any one of claims 1 to 4, characterized in that: The electrode sheet body (1) comprises a hydrogel layer (11) and an electrical isolation layer (12) arranged in a stacked manner, wherein the hydrogel layer (11) is located at the bottom of the electrical isolation layer (12) so as to be in contact with the patient's skin, and the connecting ring (21) is embedded in the electrical isolation layer (12), and the bottom of the connecting ring (21) is electrically connected to the hydrogel layer (11).

7. The electrocardiogram chest lead electrode connection structure according to claim 6, characterized in that: The electrical isolation layer (12) is a non-woven fabric layer.

8. The electrocardiogram chest lead electrode connection structure according to any one of claims 1 to 4, characterized in that: The lead head (3) further comprises a head end connection portion (33) and a lead wire (34); the conductive column (31) is fixedly connected to the head end connection portion (33); and the lead wire (34) is electrically connected to the conductive column (31).

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