CN209804327U

CN209804327U - Medical coaxial cable

Info

Publication number: CN209804327U
Application number: CN201920786443.6U
Authority: CN
Inventors: 不公告发明人
Original assignee: Hunan Vathin Medical Instrument Co Ltd
Current assignee: Hunan Vathin Medical Instrument Co Ltd
Priority date: 2019-05-28
Filing date: 2019-05-28
Publication date: 2019-12-17
Anticipated expiration: 2029-05-28

Abstract

the utility model relates to a coaxial cable signal transmission technical field, its aim at provides a medical coaxial cable. The adopted technical scheme is as follows: a medical coaxial cable comprises a coaxial line, a shielding layer and an outer sheath layer, wherein the shielding layer and the outer sheath layer are sequentially sleeved on the coaxial line from inside to outside, namely the coaxial line is arranged in the shielding layer in a penetrating way, and the outer sheath layer is sleeved outside the shielding layer; the coaxial line comprises a high-frequency coaxial line and a low-frequency coaxial line, the high-frequency coaxial line is used for transmitting high-frequency signals, the frequency range of the high-frequency signals is 3MHz-30MHz, the low-frequency coaxial line is used for transmitting low-frequency signals, the frequency range of the low-frequency signals is 30Hz-300kHz, and one end of the low-frequency coaxial line is grounded while the other end of the low-frequency coaxial line is suspended. The utility model discloses video signal's distortion can effectively be avoided.

Description

medical coaxial cable

Technical Field

the utility model relates to a coaxial cable signal transmission technical field especially relates to a medical coaxial cable.

Background

The upgrading application of cable throughout the past can not reflect the high requirement for signal transmission, and in the field of engineering communication, the coaxial cable is mainly used for transmitting video signals.

The coaxial cable multi-core wire is commonly used in medical equipment, and comprises different transmission signals such as a high-frequency video signal, a low-frequency control signal, a power signal and the like, mutual interference can occur among the core wires, and when the medical coaxial cable transmits a digital analog video signal, the condition that an image at a display end is interfered often occurs, so that the image has obvious video distortion phenomena such as transverse stripes, vertical stripes, mosaic, color cast and the like, and great troubles are brought to medical examination and diagnosis. In the prior art, the loss is compensated by only strengthening the treatment measures of medium loss, resistance loss, mismatch loss and leakage loss when the distance between signal lines exceeds a certain distance, but useful video signals are lost, and the normal use of the coaxial cable in medical equipment is not facilitated.

Disclosure of Invention

In order to solve the problems existing in the prior art, the utility model provides a medical coaxial cable.

The utility model adopts the technical proposal that:

A medical coaxial cable comprises a coaxial line, a shielding layer and an outer sheath layer, wherein the shielding layer and the outer sheath layer are sequentially sleeved on the coaxial line from inside to outside, namely the coaxial line is arranged in the shielding layer in a penetrating way, and the outer sheath layer is sleeved outside the shielding layer; the coaxial line comprises a high-frequency coaxial line and a low-frequency coaxial line, the high-frequency coaxial line is used for transmitting high-frequency signals, the frequency range of the high-frequency signals is 3MHz-30MHz, the low-frequency coaxial line is used for transmitting low-frequency signals, the frequency range of the low-frequency signals is 30Hz-300kHz, and one end of the low-frequency coaxial line is grounded while the other end of the low-frequency coaxial line is suspended.

Preferably, the shielding layer includes first shielding layer and second shielding layer, first shielding layer cover is established outside the coaxial, the second shielding layer cover is established outside first shielding layer, still be provided with the inner sheath layer between first shielding layer and the second shielding layer.

preferably, the coaxial line sequentially comprises an inner conductor, an insulating medium, an outer conductor and a protective sleeve from inside to outside.

The beneficial effects of the utility model are concentrated and are embodied in, video signal's distortion can effectively be avoided. Particularly, in the use process of the utility model, because one end of the low-frequency coaxial line is grounded and the other end is suspended, even if the high-frequency coaxial line has current flowing to the ground reference plane, the high-frequency coaxial line cannot form a loop because of single-end grounding, and the loop is formed inside a single coaxial line, so that the loop area is very small and can be ignored; the influence of the electromagnetic field in the multi-core coaxial line on a single coaxial video signal is small. The method can well avoid the distortion of the video signal, so that the receiver can truly embody the video signal output by the transmitter, and the method has popularization and use values.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic cross-sectional view of a medical coaxial cable according to the present invention;

Fig. 2 is a schematic cross-sectional view of a coaxial line in a medical coaxial cable according to the present invention;

FIG. 3 is a schematic diagram of a prior art coaxial cable connection during implementation;

Fig. 4 is a schematic connection diagram of a coaxial cable according to the present invention;

Fig. 5 is a schematic diagram of the connection of the coaxial line with the input unit and the output unit.

In the figure: 1-coaxial line; 11-an inner conductor; 12-an insulating medium; 13-an outer conductor; 14-a protective sheath; 2-a shielding layer; 111-low frequency coaxial line; 112-high frequency coaxial line; 21-a first shielding layer; 22-a second shielding layer; 3-an outer sheath layer; 4-inner jacket layer; 5-electron beam; 6-a transmitter; 7-a receiver; 8-an output unit; 9-input unit.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may include, for example, a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as appropriate by those of ordinary skill in the art.

The present invention will be further described with reference to the accompanying drawings and specific embodiments.

Example 1:

The embodiment provides a medical coaxial cable, as shown in fig. 1, which includes a coaxial cable 1, a shielding layer 2 and an outer sheath layer 3, where the shielding layer 2 and the outer sheath layer 3 are sequentially sleeved on the coaxial cable 1 from inside to outside, that is, the coaxial cable 1 is inserted into the shielding layer 2, the outer sheath layer 3 is sleeved outside the shielding layer 2, it should be understood that an electronic wire 5 is further provided in this embodiment, and the electronic wire 5 is inserted into the shielding layer 2 together with the coaxial cable 1; the coaxial line 1 comprises a high-frequency coaxial line 112 and a low-frequency coaxial line 111, wherein the high-frequency coaxial line 112 is used for transmitting high-frequency signals, the frequency range of the high-frequency signals is 3MHz-30MHz, the low-frequency coaxial line 111 is used for transmitting low-frequency signals, the frequency range of the low-frequency signals is 30Hz-300kHz, one end of the low-frequency coaxial line 111 is grounded, and the other end of the low-frequency coaxial line 111 is suspended; it should be understood that the coaxial line 1 further comprises an intermediate frequency coaxial line for transmitting intermediate frequency signals having a frequency range of 300kHz-3 MHz. Specifically, as shown in fig. 2, the coaxial line 1 includes, in order from inside to outside, an inner conductor 11, an insulating medium 12, an outer conductor 13, and a protective sheath 14.

It should be noted that fig. 3 shows a connection schematic diagram of a coaxial cable in an implementation process in the prior art, that is, the coaxial cable is connected between the transmitter 6 and the receiver 7, and the coaxial cable plays a role of signal transmission. The loop area formed by the signal line and the ground reference plane is already large (wherein, the ground reference plane can be a wire slot ground plane in engineering, or an outermost shielding net layer of a coaxial cable or another coaxial line loop ground, the plane net layer can be regarded as a reference plane independently because the position of the plane net layer is different from the ground circuit position of the coaxial line and the interfered condition is different), the interference from the electromagnetic field in the multi-core line generates a differential mode interference voltage on the unbalanced high-frequency coaxial line 112, so that the video signal passing through the inner conductor of the coaxial line is distorted, and the interference voltage between the high-frequency coaxial lines 112 can be ignored due to skin effect; the low-frequency power supply controls the skin depth of the signal coaxial cable, so that an electromagnetic field is formed more easily through the thin outer conductor and directly invades into a signal with a large loop area, a useful signal is seriously interfered, and the signal received by the receiver 7 is greatly different from the signal received by the transmitter 6, so that the fault phenomenon is reflected on the display precision of a video.

Fig. 4 shows a connection diagram of the embodiment in an implementation process, because one end of the low-frequency coaxial line 111 is grounded and the other end is suspended, even though the high-frequency coaxial line 112 has current flowing to the ground reference plane, because the high-frequency coaxial line is grounded at a single end, a loop cannot be formed, and a loop is formed inside the single coaxial line 1, and the loop area is very small and can be ignored; the influence of the electromagnetic field inside the multi-core coaxial line 1 on the single coaxial video signal is small. By adopting the mode, the distortion of the video signal can be well avoided, so that the receiver 7 can truly embody the video signal output by the transmitter 6, and the method has popularization and application values. In this embodiment, the power is transmitted by the coaxial line 1 in the single-ended grounding manner, so that the signal transmitted by the video coaxial line 1 can be prevented from being distorted.

example 2:

In a low-frequency power environment, low-frequency signals are easier to interfere with adjacent coaxial lines through the skin effect; however, the high frequency signal may interfere with the high frequency signal to a lesser extent. For further reducing the interference influence in this application, if allow to size, cost, can use multilayer shielded wire to make multicore coaxial line, still need to have the shielding layer in the middle of coaxial cable return circuit and the reference ground level, promptly shielding layer 2 includes first shielding layer 21 and second shielding layer 22, first shielding layer 21 cover is established outside coaxial line 1, second shielding layer 22 cover is established outside first shielding layer 21, still be provided with inner sheath layer 4 between first shielding layer 21 and the second shielding layer 22.

Therefore, the interference of the high-frequency signal to the video signal can be further reduced on the premise of reducing the interference of the low-frequency signal.

The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A medical coaxial cable, comprising: the coaxial cable comprises a coaxial cable (1), a shielding layer (2) and an outer sheath layer (3), wherein the shielding layer (2) and the outer sheath layer (3) are sequentially sleeved on the coaxial cable (1) from inside to outside; the coaxial line (1) comprises a high-frequency coaxial line (112) and a low-frequency coaxial line (111), wherein the high-frequency coaxial line (112) is used for transmitting high-frequency signals, the frequency range of the high-frequency signals is 3MHz-30MHz, the low-frequency coaxial line (111) is used for transmitting low-frequency signals, the frequency range of the low-frequency signals is 30Hz-300kHz, and one end of the low-frequency coaxial line (111) is grounded while the other end of the low-frequency coaxial line is suspended.

2. The medical coaxial cable of claim 1, wherein: shielding layer (2) include first shielding layer (21) and second shielding layer (22), first shielding layer (21) cover is established outside coaxial line (1), second shielding layer (22) cover is established outside first shielding layer (21), still be provided with inner sheath layer (4) between first shielding layer (21) and second shielding layer (22).

3. A medical coaxial cable according to claim 1 or 2, wherein: the coaxial line (1) comprises an inner conductor (11), an insulating medium (12), an outer conductor (13) and a protective sleeve (14) from inside to outside in sequence.