CN217506972U - Cable for endoscope and endoscope signal transmission system - Google Patents

Abstract

The utility model discloses a cable and endoscope signal transmission system for endoscope belongs to medical instrument technical field, and this cable includes the oversheath, has arranged signal conductor and ground wire in the oversheath, and signal conductor's outside parcel has the internal shield layer, and signal conductor passes through the internal shield layer and contacts with the ground wire. Through the setting, need not peel off the back with the internal shield layer and reconnect the ground wire, the shielding layer of whole root cable all contacts with the ground wire, has overcome the problem that has distributed capacitance between the wire, and anti-interference effect is better.

Description

Cable for endoscope and endoscope signal transmission system

Technical Field

The utility model relates to the technical field of medical equipment, more specifically say, relate to a cable and endoscope signal transmission system for endoscope.

Background

The cable for the endoscope is a coaxial cable, and due to different signal characteristics transmitted by cable bundles, distributed capacitance existing between the cable bundles generates interference between the cables, and in addition, the situation of electromagnetic interference in the environment where the endoscope is located in clinical application is complex, so that external interference on the multi-core cable is serious.

In order to avoid interference influence between the signal conductors, the three signal conductors are all independently arranged in the sheath, shielding layers at two ends of each signal conductor are required to be stripped out and connected with the ground wire to be grounded, namely, two ends of each signal conductor are required to be grounded, but the problem of poor signal transmission effect still exists in the actual use process, and the reason is that distributed capacitance between the conductors is ignored, and the distributed capacitance influences the anti-electromagnetic interference capability of the cable. Although the capacitance of the distributed capacitor is small, in the case of an electric appliance with a relatively strict requirement, the influence of the distributed capacitor on the circuit and the equipment is still considered.

CN 201821014474 discloses a "cable for endoscope", which includes a cable unit, an outer shield layer and an outer sheath; the outer sheath is wrapped outside the outer shielding layer, and the cable unit and the optical cable unit are arranged in the outer shielding layer in parallel; the cable unit includes a power line, a control line, and an image signal line, and the optical cable unit includes an optical fiber for transmitting an optical signal. The utility model uses the optical fiber as the light guide beam, integrates the light guide beam with the control line, the image signal line and the like to form an integral cable for the endoscope, and has convenient use and low cost; and the internal optical cable unit and the internal electric cable unit are arranged in parallel and are separately wired, and the optical fiber is not easy to break, so that the image signal transmission is more stable.

However, the above-mentioned solution fails to solve the problem of inter-wire interference caused by distributed capacitance existing between the cable harnesses; in addition, the traditional endoscope cable is relatively thick, cannot meet the development trend that the outer diameter of the endoscope is thinner and the inner channel is larger, and has complex manufacturing process and high cost; the shielding layer of each signal wire needs to be stripped to be connected with the ground wire, so that the post-processing is complex.

Therefore, there is a need for an endoscope cable that can avoid the interference between wires due to the distributed capacitance between the cable harnesses and simplify the post-processing.

SUMMERY OF THE UTILITY MODEL

1. Technical problem to be solved

An object of the utility model is to overcome among the prior art between the cable pencil because the produced line to line interference of distributed capacitance to and need peel off signal conductor's shielding layer and come out the not enough of being connected with the ground wire, provide a cable for endoscope, through reasonable settings such as the outside cladding structure of signal conductor, aim at improving the interference killing feature of cable, and simplify the postprocessing.

2. Technical scheme

In order to achieve the above purpose, the utility model provides a technical scheme does:

the utility model discloses a cable for endoscope, including the oversheath, signal conductor and ground wire have been arranged in the oversheath, signal conductor's outside parcel has the internal shield layer, signal conductor passes through the internal shield layer with the ground wire contact.

Further, an outer shielding layer is arranged on the inner side of the outer sheath and is in contact with the ground wire.

Further, a copper coating layer is arranged between the outer sheath and the outer shielding layer.

Further, the signal wire comprises a first conductor wire core, and a first insulating layer is arranged between the first conductor wire core and the inner shielding layer.

Further, including the power supply wire, the power supply wire includes second conductor sinle silk to and the cladding is in the outside second insulating layer of second conductor sinle silk.

Further, the power supply lead is provided with a plurality of wires;

and/or the presence of a gas in the gas,

the signal conductor is provided with a plurality of strips.

Furthermore, the arrangement positions of the power supply lead, the signal lead and the ground lead in the cable are relatively fixed.

Further, a tensile member is arranged between the outer sheath and the signal conductor.

Furthermore, one end of the cable is provided with a camera end head for connecting a camera, and the other end of the cable is provided with a host end head for connecting a host.

On the other hand, the utility model also provides an endoscope signal transmission system, it includes the cable for endoscope of any one above.

3. Advantageous effects

The technical scheme provided by the utility model, compared with the prior art, following beneficial effect has:

the utility model discloses a cable for endoscope, its internal shield layer, outer shielding layer and ground wire contact each other. The cable of this kind of structure need not peel off the internal shield layer and connect the ground wire again, and whole cable all contacts with the ground wire from beginning to end shield layer, has solved the problem that has distributed capacitance between wire and the wire, and the anti-interference effect is better.

Drawings

FIG. 1 is a schematic sectional view of a cable for an endoscope;

FIG. 2 is a schematic sectional view of a cable for an endoscope with an external shield;

FIG. 3 is a schematic sectional view of a copper clad wire for an endoscope.

The reference numerals in the figures illustrate:

100. a cable; 110. an outer sheath; 111. an outer shield layer; 112. a copper cladding layer; 120. a signal conductor; 121. a first conductor core; 122. a first insulating layer; 123. an inner shield layer; 130. a power supply lead; 131. a second conductor core; 132. a second insulating layer; 140. and a ground line.

Detailed Description

The invention is further described with reference to the following examples and the accompanying drawings.

The structure, ratio, size and the like shown in the drawings of the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by people familiar with the technology, and are not used for limiting the limit conditions which can be implemented by the present invention, so that the present invention does not have the substantial significance in the technology, and any structure modification, ratio relationship change or size adjustment should still fall within the scope which can be covered by the technical content disclosed by the present invention without affecting the efficacy which can be produced by the present invention and the achievable purpose. In addition, the terms "first", "second" and "middle" as used herein are for the sake of clarity, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as the scope of the present invention.

The cable for the endoscope is connected between the camera head of the endoscope and the host machine and used for supplying power to the camera head and the illumination light source by the host machine and transmitting control signals, image signals and the like between the camera head and the host machine. In any circuit, a distributed capacitance is formed between two insulated conductors with voltage difference, and the distributed capacitance is just the problem of the size of the distributed capacitance. At low frequencies, its effect on the circuit is negligible; but at high frequencies its effect on the circuit is not negligible. Therefore, in general, in high-frequency circuits and precision instruments, special attention needs to be paid to measures for reducing the influence of distributed capacitance, so that the anti-interference capability of the circuit is improved.

In order to overcome the above-described interference caused by the distributed capacitance, the present embodiment provides a cable for an endoscope, which is used particularly between an endoscope apparatus main body and an imaging unit. The endoscope cable shown in fig. 1 is electrically connected to transmit control signals, image signals, and electric power between the image pickup unit and the endoscope apparatus main body. By adopting the endoscope signal transmission system with the cable structure, the problem of distributed capacitance between leads is solved, the anti-interference capability of signal transmission can be improved, the transmission quality is high, and the transmission distance is long.

As shown in fig. 1, the cable 100 of the present embodiment includes an outer sheath 110, and the outer sheath 110 forms a first protective barrier of the cable 100 for protecting the cable 100 from damage or intrusion of foreign substances and moisture. The signal conductor 120 and the ground wire 140 are disposed within the outer sheath 110, and the ground wire 140 is provided as a bare wire. The signal wire 120 is wrapped with an inner shield layer 123, and the signal wire 120 contacts the ground wire 140 through the inner shield layer 123.

The endoscope cable of the present embodiment has a structure in which the inner shield layer 123 and the ground wire 140 are in direct contact with each other. On the one hand, the cable 100 of the structure does not need to be stripped off the inner shielding layer 123 and then connected with the ground wire 140, the whole cable 100 is in contact with the ground wire 140 from the head to the tail of the inner shielding layer 123, the problem that distributed capacitance exists between wires is solved, and the anti-interference effect is better. On the other hand, the cable 100 has a simple structure and a compact layout, and can satisfy the development trends of thinner outer diameter and larger inner channel of the endoscope.

In order to enhance the anti-interference effect of the cable 100, as shown in fig. 2, an outer shielding layer 111 may be disposed on the inner side of the outer sheath 110 in this embodiment, a cavity is formed inside the outer shielding layer 111, the cavity is used for arranging wires, and the outer shielding layer 111 is in contact with the ground wire 140. The outer shielding layer 111 may be a metal shielding layer, and the metal shielding layer is wrapped outside each of the wires to shield electromagnetic interference.

Further, as shown in fig. 3, a copper cladding layer 112 is added outside the outer shielding layer 111, that is, one side of the copper cladding layer 112 is connected to the outer sheath 110, and the other side of the copper cladding layer 112 is connected to the outer shielding layer 111. Through the above arrangement, the anti-interference effect of the cable 100 is effectively improved.

The signal wire 120 includes a first conductor wire core 121, a first insulating layer 122 is disposed between the first conductor wire core 121 and the inner shielding layer 123, and the inner shielding layer 123 is used for completely wrapping the first conductor wire core 121. The signal wire 120 is used to electrically connect the endoscope apparatus main body and the image pickup unit, and to transmit a control signal, an image signal, and the like between the endoscope apparatus main body and the image pickup unit. The arrangement of a sheath is reduced between the inner shielding layer 123 and the outer shielding layer 111, and the post-processing process is simplified.

In order to enhance the strength of the cable 100 as a whole, a tensile member is arranged between the outer sheath 110 and the signal conductor 120. Preferably, the outer shield layer 111 is filled in a space other than the tensile member so that the outer shield layer 111 is sufficiently in contact with the ground line 140.

In addition, the power supply wire 130 includes a second conductor core 131 having a conductor inner portion composed of a metal wire, and a second insulation layer 132 covering around the second conductor core 131. The power supply wire 130 is used to electrically connect the endoscope apparatus main body and the image pickup unit and to supply power from the endoscope apparatus main body to the image pickup unit. In this embodiment, two power supply wires 130 are provided; meanwhile, the signal conductor 120 is provided with three. It is noted that the specific number of each wire can be adjusted according to the use requirement.

Preferably, the arrangement positions of the power supply conductor 130, the signal conductor 120 and the ground conductor 140 inside the cable 100 are relatively fixed. The conductors inside a conventional cable are usually twisted together, that is, the relative positions of the signal conductor 120, the power supply conductor 130 and the ground conductor 140 are different in each cross section of the cable. The cable 100 in this embodiment fixes the arrangement position of the internal conductor, so that the situation of intersection can not occur when the camera is welded, and the welded part can be thinner, so that the whole equipment is lighter and more flexible to use.

In this embodiment, one end of the cable 100 may be formed with a camera head for connecting a camera, and the other end is formed with a host head for connecting a host. In order to adapt to different connection modes, the camera head and the host machine head can also have different structural forms.

In addition, the present invention further provides an endoscope signal transmission system, which includes the above-mentioned endoscope cable, and uses the provided endoscope cable for signal transmission in the system, and details are not repeated here, and reference can be made to the above description.

The above embodiment is only an implementation manner of the present invention, and the description thereof is specific and detailed, but not construed as limiting the scope of the present invention. The specific structure and the size of the device can be adjusted correspondingly according to actual needs. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.

Claims (10)

1. An endoscope cable, characterized in that: the cable comprises an outer sheath (110), wherein a signal wire (120) and a ground wire (140) are arranged in the outer sheath (110), an inner shielding layer (123) wraps the outside of the signal wire (120), and the signal wire (120) is in contact with the ground wire (140) through the inner shielding layer (123).

2. The endoscope cable according to claim 1, wherein: an outer shielding layer (111) is arranged on the inner side of the outer sheath (110), and the outer shielding layer (111) is in contact with the ground wire (140).

3. The endoscope cable according to claim 2, wherein: a copper coating layer (112) is arranged between the outer sheath (110) and the outer shielding layer (111).

4. The endoscope cable according to claim 1, wherein: the signal wire (120) comprises a first conductor wire core (121), and a first insulating layer (122) is arranged between the first conductor wire core (121) and the inner shielding layer (123).

5. The endoscope cable according to claim 1, wherein: the power supply wire (130) is arranged, and the power supply wire (130) comprises a second conductor core (131) and a second insulating layer (132) coated outside the second conductor core (131).

6. The endoscope cable according to claim 5, wherein: the power supply lead (130) is provided with a plurality of wires;

and/or the presence of a gas in the gas,

the signal conducting wire (120) is provided with a plurality of wires.

7. The endoscope cable according to claim 5, wherein: the arrangement positions of the power supply lead (130), the signal lead (120) and the ground lead (140) in the cable (100) are relatively fixed.

8. The endoscope cable according to claim 1, wherein: tensile members are arranged between the outer sheath (110) and the signal conductor (120).

9. The endoscope cable according to claim 1, wherein: one end of the cable (100) is provided with a camera end head for connecting a camera, and the other end of the cable is provided with a host end head for connecting a host.

10. An endoscope signal transmission system characterized by: comprising the endoscope cable according to any one of claims 1 to 9.

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