High-voltage direct-current cable for electronic medical equipment

Abstract

A high-voltage direct-current cable for an electronic medical instrument is characterized by comprising a positive wire, a negative wire, two grounding wires, a semi-conductive belting layer, an outer insulating layer, a metal shielding layer and an outer sheath, the cable core adopts a '2 + 2' symmetrical structure, the shielding adopts double-layer braided shielding, the cable has direct-current high-voltage resistance and radiation resistance, the outer diameter of the cable is uniform and consistent, the bending radius of the cable meets the design requirement, and the cable has the advantages of small bending radius, good flexibility, good insulation and shielding layer high-voltage resistance and breakdown resistance, strong radiation resistance and strong electromagnetic interference capability, and the like. The device is applied to various medical equipment and other occasions, the economic value and the application value are very remarkable, and the development of the national large health industry is promoted.

Description

TECHNICAL FIELD

[0001] The utility model relates to high voltage direct current cable technical field especially relates to a high voltage direct current cable for electronic medical instrument. BACKGROUND

[0002] In recent years, the intraoperative radiotherapy technology has developed to the fields of electron beam, positive voltage (250~300kV) X-ray, high dose rate brachytherapy or low energy (50kV) X-ray, among which the electron beam intraoperative radiotherapy and low energy X-ray are more mainstream, and the high voltage direct current cable used in the electronic medical instrument matched with the same has the following differences compared with the ordinary cable in addition to the general electrical performance: the bending radius limitation requirement is high, 5.5 times is allowed for 100kV and below, and 8 times for the rest; the cable is required to be super-soft; the insulation and metal shielding are required to be high-voltage-resistant and non-breakdown for 50kV; the cable is required to have strong long-term radiation resistance; the cable is required to have strong anti-strong electromagnetic interference ability; and the cable is required to be resistant to bending and twisting for 200000 times without core breaking. The existing ordinary high voltage direct current cable cannot meet the use requirements. SUMMARY

[0003] The utility model discloses a high voltage direct current cable for electronic medical instrument in the problem mentioned in the background art provides, and the bending radius is small, and the flexibility is good, and the insulation and shielding layer are high-voltage-resistant and non-breakdown, and the anti-radiation and strong electromagnetic interference ability are strong.

[0004] In order to realize the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] A high voltage direct current cable for electronic medical instrument, characterized by comprising positive electrode wire, negative electrode wire, two ground wires, semi-conductive wrapping layer, outer insulation layer, metal shielding layer and outer sheath;

[0006] The positive electrode wire and the negative electrode wire each contain a wire and an inner insulation layer, the wire is twisted by a plurality of galvanized soft copper conductors or fifth type annealed soft copper conductors with a single wire diameter of 0.2mm-0.25mm, and the inner insulation layer is made of silicone rubber material and is extruded on the wire;

[0007] The two ground wires are bare copper conductors, respectively arranged on the opposite sides of the wire bundle composed of the positive electrode wire and the negative electrode wire, and twisted into a cable core with the positive electrode wire and the negative electrode wire at a certain pitch, and the pitch ratio is less than or equal to 10 times;

[0008] The semi-conductive wrapping layer is a non-woven fabric layer made of semi-conductive material, which is extruded on the cable core to cover the cable core as a whole, and the semi-conductive material can play a role in uniform electric field;

[0009] The outer insulation layer is an insulation material layer with a thickness of 4mm extruded on the semi-conductive wrapping layer, and the outer insulation layer is made of ethylene propylene diene rubber.

[0010] The metal shielding layer is a double-layer tin-plated copper wire braided layer wrapped around the outer insulation layer, wherein the copper wire braiding density is greater than or equal to 90%, and it is connected to the ground wire to provide grounding and current leakage protection.

[0011] The outer sheath is a layer of low-smoke, halogen-free, flame-retardant, and environmentally friendly polymer material extruded onto the metal shielding layer. The sheath layer is 1.5mm thick, ensuring that the cable is protected from mechanical damage.

[0012] A further aspect of this invention is that the conductor has a cross-sectional area of ​​1.5 mm². 2 Or 2.5mm 2 .

[0013] A further aspect of this invention is that the thickness of the inner insulation layer is 0.90mm-1.1mm.

[0014] A further aspect of this invention is that the cross-sectional area of ​​the grounding wire is 0.75-2.5 mm². 2 .

[0015] The beneficial effects of this utility model are as follows: the cable core adopts a "2+2" symmetrical structure, the shielding adopts double-layer braided shielding, which has DC high voltage resistance and radiation resistance, the cable outer diameter is uniform, and its bending radius meets the design requirements. This cable has a small bending radius, good flexibility, good high voltage resistance and anti-breakdown performance of insulation and shielding layers, strong resistance to radiation and strong electromagnetic interference, and can be applied to various medical equipment and other occasions. Its economic and application value is very significant, promoting the development of the national health industry. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Example

[0018] like Figure 1 As shown, a high-voltage DC cable for electronic medical devices includes a positive conductor 1, a negative conductor 2, two grounding wires 3, a semi-conductive wrapping layer 4, an outer insulation layer 5, a metal shielding layer 6, and an outer sheath 7.

[0019] The positive and negative conductors each include a conductor 11 and an inner insulation layer 12. The conductor 11 is made of several galvanized soft copper conductors or Class V annealed soft copper conductors with a single wire diameter of 0.2mm-0.25mm twisted together. The inner insulation layer 12 is made of silicone rubber and is extruded onto the conductor 11.

[0020] The two grounding wires 3 are bare copper conductors, respectively set on opposite sides of the wire bundle consisting of positive conductor 1 and negative conductor 2, and twisted together with positive conductor 1 and negative conductor 2 at a certain pitch to form a cable core, with a pitch ratio of less than or equal to 10.

[0021] The semi-conductive wrapping layer 4 is a non-woven fabric layer of semi-conductive material that is extruded around the cable core to cover the cable core as a whole. The use of semi-conductive material can play a role in uniform electric field.

[0022] The outer insulation layer 5 is a 4mm thick insulating material layer on the extruded semi-conductive tape layer 4, and the material of the outer insulation layer 5 is EPDM rubber.

[0023] The metal shielding layer 6 is a double-layer tin-plated copper wire braided layer wrapped around the outer insulation layer 5, wherein the copper wire braiding density is greater than or equal to 90%, and it is connected to the grounding wire 3 to jointly ground and play a current leakage protection role.

[0024] The outer sheath 7 is a layer of low-smoke, halogen-free, flame-retardant, and environmentally friendly polymer material extruded onto the metal shielding layer 6. The sheath layer 7 is 1.5mm thick, ensuring that the cable is protected from mechanical damage.

[0025] The conductor 11 has a cross-sectional area of ​​1.5 mm². 2 Or 2.5mm 2 .

[0026] The thickness of the inner insulation layer 12 is 0.90mm-1.1mm.

[0027] The cross-sectional area of ​​the grounding wire 3 is 0.75-2.5mm². 2 .

Claims

1. A high voltage DC cable for an electronic medical instrument, characterized by The cable comprises positive pole conductor, negative pole conductor, two ground wires, semi-conductive wrapping layer, outer insulation layer, metal shielding layer and outer sheath. The positive pole conductor and the negative pole conductor each comprise a conductor and an inner insulation layer, the conductor is twisted by several galvanized soft copper conductors or the fifth type of annealed soft copper conductors with a single wire diameter of 0.2mm-0.25mm, and the inner insulation layer is made of silicone rubber and is extruded on the conductor. The two ground wires are bare copper conductors, which are arranged on the opposite sides of the wire bundle composed of the positive pole conductor and the negative pole conductor, and are twisted with the positive pole conductor and the negative pole conductor into a cable core with a pitch ratio less than or equal to 10 times. The semi-conductive wrapping layer is a non-woven fabric layer made of semi-conductive material, which is extruded on the cable core to cover the cable core into a whole, and the semi-conductive material can be used to uniform the electric field. The outer insulation layer is an insulation material layer with a thickness of 4mm, which is extruded on the semi-conductive wrapping layer, and the material of the outer insulation layer is ethylene-propylene-diene rubber. The metal shielding layer is a double-layer tinned copper wire braiding layer, which is wrapped on the outer insulation layer, the braiding density of the copper wire is greater than or equal to 90%, and the metal shielding layer is connected with the ground wire to achieve the function of current discharge protection. The outer sheath is a layer of low-smoke halogen-free flame-retardant environmental protection polymer material layer, which is extruded on the metal shielding layer, the thickness of the sheath layer is 1.5mm, and the cable is protected from mechanical damage.

2. A high voltage DC cable for an electronic medical device as defined in claim 1, characterized in that The wire has a cross-sectional area of 1.5 mm 2 or 2.5 mm 2 .

3. A high voltage DC cable for an electronic medical instrument according to claim 1 or 2, characterized in that The thickness of the inner insulation layer is 0.90mm-1.1mm.

4. A high voltage DC cable for an electronic medical device according to claim 1 or 2, characterized in that The ground wire section area is 0.75-2.5mm 2 .

5. A high voltage DC cable for an electronic medical device as defined in claim 3, characterized in that The ground wire section area is 0.75-2.5mm 2 .

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