CN221242891U - Electrocardiogram detection electrode push-pull arm with length capable of being adjusted in multiple steps and portable electrocardiograph - Google Patents

Abstract

The utility model provides an electrocardiograph detection electrode push-pull arm with a length capable of being adjusted in multiple steps and a portable electrocardiograph, wherein the electrocardiograph detection electrode push-pull arm comprises: the sliding chute body is provided with a chute; the sliding arm body is connected in the sliding groove in a sliding manner so as to slide along the guiding direction of the sliding groove, and is provided with a storage state pushed into the sliding groove and a detection state pulled out of the sliding groove, wherein when the sliding arm body is in the detection state, the extending length of the sliding arm body at least comprises two gears. The extension length of the push-pull arm body in the detection state at least comprises two gears, so that the push-pull arm body can adapt to users to be detected with different body types in a certain range, the detection electrodes arranged on the push-pull arm body can be adjusted and accurately positioned at target positions with different body types, and the accuracy of electrocardiograph detection output results is improved.

Description

Electrocardiogram detection electrode push-pull arm with length capable of being adjusted in multiple steps and portable electrocardiograph

Technical Field

The utility model belongs to the technical field of portable electrocardiograph design, and particularly relates to an electrocardiograph push-pull arm with a length capable of being adjusted in multiple steps and an electrocardiograph.

Background

The traditional twelve-lead electrocardiograph adopts the Wilson twelve-lead system, and the lead of the electrocardiograph detection system with the structure is more and easy to wind, the detection point is complex in position and can be completed by professional personnel, and the electrocardiograph detection operation is difficult to master for ordinary people, so that the electrocardiograph detection system cannot be conveniently used in common people. Based on the foregoing shortcomings of the conventional twelve-conductivity electrocardiograph, some portable electrocardiographs are proposed in the related art, but these portable electrocardiographs are difficult to adapt to individual differences of different user sizes due to design problems, especially for the V6 detection electrode, which needs to be positioned relatively accurately to the 3/4 intercostal armpit central line position on the left side of the human body during specific detection, while the support arm with fixed length cannot adapt to users with different sizes, especially users with large fat-thin differences, and the electrocardiograph detection output result has a distortion risk because the detection electrode contact cannot be positioned accurately at the target position during electrocardiograph detection. The present utility model has been made in view of the foregoing technical problems.

Disclosure of utility model

The utility model provides an electrocardiograph detection electrode push-pull arm with a length capable of being adjusted in multiple steps and a portable electrocardiograph, which can solve the technical problem that in the prior art, the length of the electrocardiograph detection electrode push-pull arm which is connected to a support body in a push-pull sliding manner cannot be adjusted, so that a V6 detection electrode arranged on the electrocardiograph detection electrode cannot be accurately positioned at target positions of different body types, and the electrocardiograph detection output result is at risk of distortion.

In order to solve the above problems, the present utility model provides an electrocardiograph detection electrode push-pull arm with a length adjustable in multiple steps, comprising:

the sliding chute body is provided with a chute;

The sliding arm body is connected in the sliding groove in a sliding manner so as to slide along the guiding direction of the sliding groove, and is provided with a storage state pushed into the sliding groove and a detection state pulled out of the sliding groove, wherein when the sliding arm body is in the detection state, the extending length of the sliding arm body at least comprises two gears.

In some embodiments of the present invention, in some embodiments,

The sliding chute is provided with an inner end and an outer end which are positioned in the sliding guiding direction of the sliding chute, the sliding arm body slides from the inner end to the outer end to be pulled out, at least two gear grooves are formed in the chute wall of the sliding chute corresponding to the outer end, a telescopic positioning assembly is arranged on the wall surface parallel to the chute wall of the sliding arm body, the telescopic positioning assembly is provided with a limiting state inserted in the corresponding gear grooves and a sliding state retracted and contacted with the chute wall, and when the sliding arm body is in the detecting state, the telescopic positioning assembly is in the limiting state.

In some embodiments of the present invention, in some embodiments,

The telescopic positioning assembly comprises a pin body and an elastic piece, wherein the elastic piece applies elastic force to the tail end of the pin body so as to enable the free end of the pin body to be inserted into the gear groove corresponding to the position of the free end of the pin body.

In some embodiments of the present invention, in some embodiments,

The elastic piece is a coil spring, the coil spring is sleeved on the tail end of the pin body, a stop ring is further constructed on the tail end of the pin body, and the first end of the coil spring is abutted on the annular wall surface of the stop ring.

In some embodiments of the present invention, in some embodiments,

The push-pull arm body comprises a shell, a limit rib is arranged in the shell, and the second end of the spiral spring is abutted to the side wall, facing the pin body, of the limit rib.

In some embodiments of the present invention, in some embodiments,

The two side groove walls of the sliding groove are respectively provided with at least two gear grooves, each gear groove on the two side groove walls is symmetrical with respect to the sliding center line of the sliding groove, the two groups of telescopic positioning components are arranged, and each telescopic positioning component is respectively arranged corresponding to the two side groove walls.

In some embodiments of the present invention, in some embodiments,

A locking groove is formed in the groove wall of the sliding groove corresponding to the inner end, and when the push-pull arm body is in the storage state, the telescopic positioning assembly is inserted into the locking groove; and/or the number of the groups of groups,

A limiting protrusion is arranged at a notch corresponding to the outer end of the chute; and/or a roller is arranged at the notch corresponding to the outer end of the chute, and the roller and the bottom wall of the chute jointly form a clamping limit for the push-pull arm body.

In some embodiments of the present invention, in some embodiments,

The push-pull arm body comprises a first arm section close to the inner end and a second arm section far away from the inner end, the first arm section is hinged with the second arm section, a torsion spring is arranged between the first arm section and the second arm section, and the torsion spring can enable the near body side of the first arm section to have a trend of approaching to each other with the near body side of the second arm section.

In some embodiments of the present invention, in some embodiments,

A plurality of gear marks are formed on the proximal surface of the first arm segment 231, and the position of each gear mark corresponds to the position of each gear groove 111.

The utility model also provides a portable electrocardiograph, which comprises a bracket main body and a push-pull arm assembled and connected to the bracket main body, wherein the push-pull arm is an electrocardiograph detection electrode push-pull arm with the length capable of being adjusted in multiple steps.

The electrocardiograph detection electrode push-pull arm with the length capable of being adjusted in multiple steps and the portable electrocardiograph have the following beneficial effects:

The extension length of the push-pull arm body in the detection state at least comprises two gears, so that the push-pull arm body can adapt to users to be detected of different body types in a certain range, the detection electrodes arranged on the push-pull arm body can be adjusted to be accurately positioned at target positions of different body types, and the accuracy of electrocardiograph detection output results is improved.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those skilled in the art from this disclosure that the drawings described below are merely exemplary and that other embodiments may be derived from the drawings provided without undue effort.

The structures, proportions, sizes, etc. shown in the present specification are shown only for the purposes of illustration and description, and are not intended to limit the scope of the utility model, which is defined by the claims, so that any structural modifications, changes in proportions, or adjustments of sizes, which do not affect the efficacy or the achievement of the present utility model, should fall within the ambit of the technical disclosure.

FIG. 1 is a schematic perspective view of a push-pull arm body in a multi-stage length adjustable electrocardiograph detection electrode push-pull arm according to an embodiment of the present utility model;

FIG. 2 is a front view (from its proximal side) of FIG. 1;

FIG. 3 is a cross-sectional view of A-A of FIG. 2;

FIG. 4 is a schematic perspective view of a push-pull chute body in a push-pull arm of an electrocardiograph detection electrode with a length capable of being adjusted in multiple steps according to an embodiment of the present utility model;

FIG. 5 is a front view of FIG. 4;

FIG. 6 is a schematic perspective view of a portable electrocardiograph according to an embodiment of the present utility model;

Fig. 7 is a schematic perspective view of a portable electrocardiograph according to an embodiment of the present utility model.

The reference numerals are expressed as:

1. Pushing and pulling a chute body; 11. a chute; 111. a gear groove; 112. a locking groove; 113. a limit protrusion; 2. a push-pull arm body; 21. a telescoping positioning assembly; 211. a pin body; 212. an elastic member; 213. a stop ring; 22. a limit rib; 231. a first arm segment; 232. a second arm segment; 24. a torsion spring; 100. a holder main body; 101. LA detection electrode; 102. LL detection electrode; 103. v3 detection electrode; 104. a RL detection electrode; 105. v1 detection electrode; 106. v2 detection electrode; 107. v4 detection electrode; 108. v5 detection electrode; 109. v6 detection electrode; 200. push-pull arm.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

It should be understood that the term "and/or" as used herein is merely one relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present utility model unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present utility model, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present utility model; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface on … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present utility model.

Referring to fig. 1 to 7, in accordance with an embodiment of the present utility model, and referring specifically to fig. 1 and 4 in combination, there is provided an electrocardiograph detection electrode push-pull arm with a length adjustable in multiple steps, including:

The sliding chute body 1 is provided with a chute 11, and it can be understood that the length extension direction of the chute 11 is the sliding guiding direction;

a push-pull arm body 2 slidably connected to the inside of the chute 11, the push-pull arm body 2 being capable of being pushed and pulled to slide along the guiding direction of the chute 11, the push-pull arm body 2 having a storage state of being pushed into the chute 11 and a detection state of being pulled out of the chute 11, that is, the push-pull arm body 2 being capable of being pulled out of the chute 11 or being pushed into the chute 11 by a force applied by a user or an operator, wherein when the push-pull arm body 2 is in the detection state, the extension length of the push-pull arm body 2 includes at least two steps, it being understood that the push-pull arm body 2 has a side facing the user to be detected, i.e., a proximal side, on which at least one detection electrode for performing an electrical signal detection of a 3/4-rib under-axillary center line position of the user to be detected is provided.

In this technical scheme, push-pull arm body 2 includes two at least keeps off in the extension length under the detection state to can adapt to the waiting to detect the user of different sizes in certain limit and use, thereby make the detection electrode that sets up on it can be adjusted the target position department that the accurate determination is located different sizes, improve the accuracy of electrocardiograph's electrocardio detection output result.

In some embodiments, the sliding chute 11 has an inner end and an outer end in a sliding guiding direction, the sliding arm 2 slides from the inner end to the outer end in a pulling direction, at least two gear grooves 111 are configured on a groove wall of the sliding chute 11 corresponding to the outer end, as shown in fig. 4, in the embodiment corresponding to the fig., the gear grooves 111 are provided with five in total, which means that the length of the corresponding sliding arm 2 can have five gears, so that the corresponding electrocardiograph can adapt to a wider range of body types, the wall surface, parallel to the groove wall, of the sliding arm 2 is provided with a telescopic positioning assembly 21, the telescopic positioning assembly 21 has a limiting state of being inserted into the corresponding gear groove 111 and a sliding state of being retracted and contacting with the groove wall, and when the sliding arm 2 is in the detecting state, the telescopic positioning assembly 21 is in the limiting state.

In the technical scheme, reliable limiting of different extending lengths of the push-pull arm body 2 is realized through the inserting and assembling relation of the telescopic positioning assembly 21 and each gear groove 111, so that the position reliability of the push-pull arm body 2 after the user selects the length is ensured, and the application operation of the push-pull arm body 2 is convenient for the user.

Referring to fig. 3, the telescopic positioning assembly 21 includes a pin body 211 and an elastic member 212, wherein the elastic member 212 applies an elastic force to the tail end of the pin body 211 so as to enable the free end of the pin body 211 to be inserted into the gear groove 111 corresponding to the position thereof. In this technical solution, the pin body 211 is used as a plugging component between the telescopic positioning assembly 21 and each gear groove 111, and has a simple structure, and generates an outward axial movement trend along the axis of the pin body 211 under the action of the elastic force of the elastic member 212, and when the pin body 211 is positioned corresponding to the gear groove 111 during the sliding process of the push-pull arm body 2, it will slide into the gear groove 111, so as to realize the limit of the extending length of a gear, and it can be understood that the free end of the pin body 211 should be designed into a hemispherical structure, and the section of the corresponding gear groove 111 should be in a minor arc shape, so that when the force is further applied to the push-pull arm body 2, the pin body 211 can be smoothly separated from the gear groove 111 against the action of the elastic force of the elastic member 212, so as to facilitate readjustment of the length of the push-pull arm body 2.

As a specific implementation manner, further referring to fig. 3, the elastic member 212 is a coil spring, the coil spring is sleeved on the tail end of the pin body 211, and a stop ring 213 is further configured on the tail end of the pin body 211, and a first end of the coil spring abuts against a wall surface of the stop ring 213.

In this technical scheme, adopt coil spring to cup joint with the tail end of the round pin body 211 and form the thrust spacing to coil spring's first end through the stop ring 213, when can have higher connection reliability for structural design is compacter reasonable.

In a preferred embodiment, the push-pull arm 2 includes a housing (not labeled in the drawing), in which a limit rib 22 is disposed, the limit rib 22 forms a U-shaped opening, and the second end of the coil spring abuts against the side wall of the limit rib 22 facing the pin body 211, at this time, the position of the coil spring is reliably and stably located in the area surrounded by the limit rib 22, so as to ensure the reliability of the telescopic positioning assembly 21.

At least two gear grooves 111 are formed on the two side groove walls of the sliding groove 11, each gear groove 111 on the two side groove walls is symmetrical with respect to the sliding center line of the sliding groove 11, two groups of telescopic positioning assemblies 21 are arranged, and each telescopic positioning assembly 21 is arranged corresponding to the two side groove walls. In this technical scheme, the gear recess 111 that bilateral symmetry set up can match respectively with bilateral symmetry's flexible locating component 21 and correspond the setting, can make the push-and-pull sliding process of push-and-pull arm body 2 steady, smooth and easy, prevents that the uneven problem of atress that unilateral setting brought from taking place.

As shown in fig. 4 and 5, in some embodiments, a locking groove 112 is formed on a groove wall of the chute 11 corresponding to the inner end, and when the push-pull arm 2 is in the storage state, the telescopic positioning assembly 21 is inserted into the locking groove 112.

In this technical scheme, also correspond on the cell wall that the inner of spout 11 corresponds and set up locking groove 112, can make push-and-pull arm body 2 more reliable and more stable in the state of accomodating, prevent its unexpected damage of stretching out and bringing from spout 11.

In some embodiments of the present invention, in some embodiments,

The notch department that the outer end of spout 11 corresponds is provided with spacing protruding 113, and this spacing protruding 113 extends a take-off height towards the inboard of spout 11, can understand that it should not cause the disadvantage to the push-and-pull slip of push-and-pull arm body 2, can restrict the maximum length that stretches out of push-and-pull arm body 2 through this spacing protruding 113 of design, prevents that push-and-pull arm body 2 from slipping in the spout 11.

The roller (not shown in the figure) is arranged at the notch corresponding to the outer end of the chute 11, the roller and the bottom wall of the chute 11 jointly form a clamping limit for the push-pull arm body 2, and the roller can rotate around the axis of the roller under the action of friction force generated in the push-pull sliding process of the push-pull arm body 2, so that the push-pull sliding of the push-pull arm body 2 is smoother, and the position in the sliding process is more reliable and stable.

In another preferred embodiment, the push-pull arm body 2 includes a first arm segment 231 (which may also be referred to as an inner arm segment) near the inner end and a second arm segment 232 (which may also be referred to as an outer arm segment) far from the inner end, the first arm segment 231 is hinged to the second arm segment 232, and a torsion spring 24 is disposed between the first arm segment 231 and the second arm segment 232, and the torsion spring 24 can enable the proximal side of the first arm segment 231 and the proximal side of the second arm segment 232 to have a tendency to approach each other, and the aforementioned detection electrode is disposed on the proximal side of the second arm segment 232.

In this technical scheme, through setting up torsional spring 24 in the articulated position department of first arm section 231 and second arm section 232 to make the detection electrode on the second arm section 232 under the detection state (i.e. in the use) can be inseparable contact wait to detect user's health, guarantee the detection effect.

In a preferred embodiment, a plurality of gear marks are formed on the surface of the proximal side of the first arm segment 231, and the positions of the gear marks correspond to the positions of the gear grooves 111, so as to clearly feed back the length adjustment result of the push-pull arm body by the user or the operator to be detected.

According to an embodiment of the present utility model, there is further provided a portable electrocardiograph, including a stand main body 100 and a push-pull arm 200 assembled and connected to the stand main body 100, wherein the push-pull arm 200 is the electrocardiograph detection electrode push-pull arm with the length capable of being adjusted in multiple steps. Specifically, referring to fig. 6 and 7 in combination, the second arm segment 232 is provided with three detection electrodes, namely, a V4 detection electrode 107, a V5 detection electrode 108, and a V6 detection electrode; the proximal surface of the support main body 100 is further provided with a V1 detection electrode 105, a V2 detection electrode 106, a V3 detection electrode 103, a LL detection electrode 102 and a RL detection electrode 104, the distal surface of the support main body 100 is provided with two symmetrical LA detection electrodes 101 and RA detection electrodes (not shown in the figure), the naming rules of the ten detection electrodes are the same as those of the related detection electrodes (columns or sheets) of the traditional twelve-lead electrocardiograph detector, and the arrangement positions of the detection electrodes are designed according to the ergonomics and meet the requirements of the known twelve-lead wilson positioning system.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model. The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present utility model, and these modifications and variations should also be regarded as the scope of the utility model.

Claims (10)

1. An electrocardiograph detection electrode push-pull arm with a length capable of being adjusted in multiple steps, which is characterized by comprising:

A sliding chute body (1) on which a chute (11) is constructed;

The sliding arm body (2) is connected in the sliding groove (11) in a sliding manner so as to slide along the guiding direction of the sliding groove (11), the sliding arm body (2) is provided with a storage state pushed into the sliding groove (11) and a detection state pulled out of the sliding groove (11), and when the sliding arm body (2) is in the detection state, the extending length of the sliding arm body (2) at least comprises two gears.

2. The electrocardiograph detection electrode push-pull arm according to claim 1, wherein,

The sliding chute (11) is provided with an inner end and an outer end which are positioned in the sliding guide direction of the sliding chute (11), the sliding arm body (2) slides from the inner end to the outer end to be pulled out, at least two gear grooves (111) are formed in the wall surface of the sliding chute (11) corresponding to the outer end, a telescopic positioning assembly (21) is arranged on the wall surface parallel to the wall surface of the sliding arm body (2), the telescopic positioning assembly (21) is provided with a limiting state inserted in the corresponding gear grooves (111) and a sliding state which is retracted and contacted with the wall surface of the sliding arm body, and when the sliding arm body (2) is in the detection state, the telescopic positioning assembly (21) is in the limiting state.

3. The electrocardiograph detection electrode push-pull arm according to claim 2, wherein,

The telescopic positioning assembly (21) comprises a pin body (211) and an elastic piece (212), wherein the elastic piece (212) applies elastic force to the tail end of the pin body (211) so as to enable the free end of the pin body (211) to be inserted into the gear groove (111) corresponding to the position of the free end.

4. The electrocardiograph detection electrode push-pull arm according to claim 3, wherein,

The elastic piece (212) is a spiral spring, the spiral spring is sleeved on the tail end of the pin body (211), a stop ring (213) is further constructed on the tail end of the pin body (211), and the first end of the spiral spring is abutted on the annular wall surface of the stop ring (213).

5. The electrocardiograph detection electrode push-pull arm according to claim 4, wherein,

The push-pull arm body (2) comprises a shell, a limit rib (22) is arranged in the shell, and the second end of the spiral spring is abutted to the side wall, facing the pin body (211), of the limit rib (22).

6. The electrocardiograph detection electrode push-pull arm according to claim 5, wherein,

At least two gear grooves (111) are formed in the groove walls on the two sides of the sliding groove (11), the gear grooves (111) on the groove walls on the two sides are symmetrical with respect to the sliding center line of the sliding groove (11), two groups of telescopic positioning assemblies (21) are arranged, and each telescopic positioning assembly (21) is arranged corresponding to the groove walls on the two sides.

7. The electrocardiograph detection electrode push-pull arm according to claim 2, wherein,

A locking groove (112) is formed in the groove wall of the sliding groove (11) corresponding to the inner end, and when the push-pull arm body (2) is in the storage state, the telescopic positioning assembly (21) is inserted into the locking groove (112); and/or the number of the groups of groups,

A limiting protrusion (113) is arranged at a notch corresponding to the outer end of the sliding groove (11); and/or a roller is arranged at the notch corresponding to the outer end of the sliding groove (11), and the roller and the groove bottom wall of the sliding groove (11) jointly form clamping limit for the push-pull arm body (2).

8. The electrocardiograph detection electrode push-pull arm according to claim 2, wherein,

The push-pull arm body (2) comprises a first arm section (231) close to the inner end and a second arm section (232) far away from the inner end, the first arm section (231) is hinged with the second arm section (232), a torsion spring (24) is arranged between the first arm section (231) and the second arm section (232), and the torsion spring (24) can enable the near body side of the first arm section (231) and the near body side of the second arm section (232) to have opposite approaching trend.

9. The electrocardiograph detection electrode push-pull arm according to claim 8, wherein,

A plurality of gear marks are formed on the surface of the first arm section (231) on the near body side, and the positions of the gear marks correspond to the positions of the gear grooves (111).

10. A portable electrocardiograph, comprising a bracket main body (100) and a push-pull arm (200) assembled and connected to the bracket main body (100), wherein the push-pull arm (200) is an electrocardiograph detection electrode push-pull arm with a length capable of being adjusted in multiple steps according to any one of claims 1 to 9.