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CN-121983375-A - Preparation method of medical imaging equipment composite cable

CN121983375ACN 121983375 ACN121983375 ACN 121983375ACN-121983375-A

Abstract

The invention belongs to the technical field of medical cable manufacture, and discloses a preparation method of a medical imaging device composite cable, which sequentially comprises a cable core, an inner shielding layer, an outer shielding layer and an outer sheath from inside to outside, the cable core includes a centrally located center reinforcement and fluid transmission channels, visual channels, and acoustic channels stranded therearound. According to the invention, the high-strength reinforcing piece is arranged in the center of the cable core, a specific twisting pitch process is adopted, the central reinforcing piece is used as a main bearing unit, most of axial tensile load can be borne, the situation that an outer sheath and an inner fragile optical fiber are broken or deformed in an extending way due to overlarge stress is avoided, meanwhile, each functional unit has a certain relative movement space when being bent due to a reasonable twisting structure, the stress concentration caused by overlarge bending radius is prevented, the problem that the cable is easy to fatigue fracture or sheath collapse is avoided, and the physical integrity of the cable under long-term repeated use is ensured.

Inventors

  • ZHANG XUEWU
  • ZHANG XIAOFEN
  • TAO LEI

Assignees

  • 上海统缆科技有限公司

Dates

Publication Date
20260505
Application Date
20260206
Priority Date
20260108

Claims (10)

  1. 1. The composite cable of the medical imaging equipment sequentially comprises a cable core, an inner shielding layer (3), an outer shielding layer (2) and an outer sheath (1) from inside to outside, and is characterized in that the cable core comprises a central reinforcing piece (5) positioned at the center, a fluid transmission channel (8), a visual channel (9), an auditory channel (10), an olfactory channel (11) and an electric control channel (6) which are arranged around the central reinforcing piece in a twisting manner; The olfactory channel (11) comprises a shielding wire and a miniature gas sensor integrated at the end of the shielding wire, a breathable waterproof film is attached to the sensing surface of the miniature gas sensor, a local packaging adhesive layer is arranged at the pin and the welding part of the miniature gas sensor, and the local packaging adhesive layer avoids the sensing surface of the miniature gas sensor, so that a physical isolation channel for liquid and a selective permeation channel for gas are formed.
  2. 2. The medical imaging equipment composite cable according to claim 1, wherein the breathable waterproof membrane is an ePTFE film, and the micropore diameter of the breathable waterproof membrane is smaller than the diameter of water molecules and larger than the diameter of gas molecules; The visual channel (9) comprises an outer loose tube and an inner optical fiber bundle (7), a touch-type fiber paste is filled between the loose tube and the optical fiber bundle (7), and an anti-sterilization lubricating coating is coated on the inner wall of the fluid transmission channel (8).
  3. 3. The composite cable for medical imaging equipment according to claim 1, wherein the inner shielding layer (3) is a longitudinally-covered metal foil layer with an overlapping rate of more than or equal to 30%, and the outer shielding layer (2) is a woven metal mesh layer with a coverage rate of more than or equal to 90%; The hearing channel (10) comprises a stranded conductor, an insulating layer (12) extruded outside the stranded conductor and an aluminum foil shielding layer wrapped outside the insulating layer (12); And forming a layered shielding structure aiming at the high-frequency image signals and the low-frequency audio signals through the inner shielding layer, the outer shielding layer and the aluminum foil shielding layer.
  4. 4. The medical imaging equipment composite cable according to claim 1, wherein the central reinforcing piece (5) is made of aramid yarn, a filling layer (4) formed by polypropylene filling ropes is filled in a gap of the cable core, and the material of the outer sheath (1) is an irradiation-resistant thermoplastic polyurethane elastomer with Shore hardness of 80A.
  5. 5. The medical imaging equipment composite cable according to claim 1, wherein the miniature gas sensor is embedded in a reserved position of a cable end, the end face of the miniature gas sensor is flush with the end face of the outer sheath (1), the fluid transmission channel (8) is made of FEP or PFA, and the elongation at break of the fluid transmission channel is more than or equal to 300%.
  6. 6. A method for preparing a composite cable for medical imaging equipment according to any one of claims 1 to 5, comprising the following steps: S1, prefabricating functional units, namely respectively preparing the fluid transmission channel (8), the visual channel (9), the auditory channel (10), the olfactory channel (11) and the electric control channel (6); s2, twisting each functional channel around the central reinforcing piece (5), and filling a filling layer (4) at a gap; s3, shielding application, namely sequentially coating the inner shielding layer (3) and the outer shielding layer (2) outside the cable core; and S4, sheath extrusion, namely extruding the outer sheath (1) outside the outer shielding layer (2) by adopting a temperature gradient extrusion process, wherein the temperature gradient is set to gradually rise from the feeding section to the machine head, and the low-temperature flow characteristic is utilized to reduce the thermal shock to the internal optical fiber and the sensor.
  7. 7. The method for manufacturing the composite cable for medical imaging equipment according to claim 6, wherein in the step S1, the specific process for manufacturing the olfactory passageway (11) is that the miniature gas sensor is welded to the lead wire, then the welding position is subjected to dispensing to form a local packaging adhesive layer, and finally the breathable waterproof film is attached to the sensing surface of the miniature gas sensor with a film attaching pressure of 0.05 MPa.
  8. 8. The method of claim 6, wherein in the step S4, the specific temperature of the temperature gradient extrusion process is set to 160 ℃ in the feeding section, 190 ℃ in the melting section and 200 ℃ in the machine head, the extruded cable immediately enters a cooling tank at 25+/-2 ℃ for cooling, and the cable is aged for 24 hours in the natural environment to eliminate internal stress.
  9. 9. The method for preparing a composite cable for medical imaging equipment according to claim 6, wherein in the step S2, the cabling pitch ratio of the cable core combination is set to be 16-18 times, the paying-off tension difference of each functional unit is controlled to be less than or equal to 3%, and the central reinforcement (5) bears main axial tension in the twisting process.
  10. 10. The method for preparing a composite cable for medical imaging equipment according to claim 6, wherein in the step S1, the preparation of the fluid transmission channel (8) comprises extruding and molding a tube body at a temperature of 280-320 ℃, then coating an anti-sterilization and lubrication coating on the inner wall of the tube body and curing, and the preparation of the visual channel (9) comprises penetrating an optical fiber into a loose tube made of PBT material and synchronously injecting a touch-type fiber paste, wherein the extrusion temperature of the loose tube is controlled at 240-260 ℃.

Description

Preparation method of medical imaging equipment composite cable Technical Field The invention belongs to the technical field of medical cable manufacturing, and particularly relates to a preparation method of a medical image equipment composite cable. Background With the rapid development of minimally invasive medical technology and accurate medicine, the functions of high-end medical imaging devices such as endoscopes, interventional catheters and the like are increasingly complicated. In order to meet the omnibearing sensing requirement of the clinical operation on the internal environment of the human body, the cable connecting the probe and the control host computer does not only bear a single power transmission or image transmission function, but also evolves towards the composite direction of 'photoelectric liquid-gas integration'. The current medical imaging equipment generally needs to integrate various functional units such as high-definition vision transmission, auxiliary illumination, electric drive, surgical instrument channels, fluid flushing channels and the like in an extremely fine cable. However, the existing medical imaging equipment composite cable still has a plurality of technical bottlenecks which are difficult to overcome in the practical application and manufacturing process. First, the contradiction between multi-signal interference and mechanical stability is increasingly prominent. Because the internal space of the cable is narrow, high-frequency digital image signals, high-current power signals and weak analog sensing signals are mixed and distributed, serious electromagnetic interference is easily generated, and image noise is increased or acoustic signals are distorted. The existing shielding structure is often simpler, and only adopts a single-layer aluminum foil or a low-coverage-rate woven mesh, so that sufficient shielding efficiency cannot be provided in a high-frequency medical environment. In addition, during the operation of the endoscope, the cable needs to be frequently subjected to torsion and dragging, and the existing cable structure lacks an effective axial strengthening design, so that an internal fragile optical fiber is easily broken due to uneven stress, or the sheath is caused to collapse and deform, and the service life and clinical safety of the cable are seriously influenced. Secondly, the existing preparation process is difficult to consider the integration precision of the micro sensor and the integral tolerance of the cable. In particular in the manufacture of cables involving olfactory sensing functions, it is a great challenge how to integrate miniature gas sensors into the cable head and maintain their sensitivity. The traditional full packaging technology can protect the sensor from body fluid corrosion, but the sealing material can block gas contact, so that the response time is too long to meet the real-time monitoring requirement in operation, and the exposed design is extremely easy to cause short circuit damage of the sensor. On the other hand, in the sheath extrusion process of the composite cable, the prior art generally adopts a constant temperature high temperature extrusion process of 210 ℃ to 230 ℃. The high-temperature thermal shock not only easily causes the coating layer of the internal optical fiber to be damaged and increases additional loss, but also can cause the cable sheath material to be degraded by molecular chains in the subsequent gamma ray sterilization process, so that the sheath becomes brittle and cracks, thereby not only reducing the production yield, but also being incapable of meeting the severe requirements of medical instruments on the irradiation resistance. Disclosure of Invention The invention aims to provide a preparation method of a medical imaging device composite cable, which aims to solve the problems in the background technology. In order to achieve the above purpose, the composite cable of the medical imaging equipment comprises a cable core, an inner shielding layer, an outer shielding layer and an outer sheath from inside to outside, wherein the cable core comprises a central reinforcing piece positioned at the center, a fluid transmission channel, a visual channel, an auditory channel, an olfactory channel and an electric control channel which are stranded and arrayed around the central reinforcing piece, the olfactory channel comprises a shielding wire and a miniature gas sensor integrated at the end of the shielding wire, a breathable waterproof film is attached to the sensing surface of the miniature gas sensor, a local packaging adhesive layer is arranged at a pin and a welding position of the miniature gas sensor, and the local packaging adhesive layer avoids the sensing surface of the miniature gas sensor, so that a physical isolation for liquid and a selective permeation channel for gas are formed. According to the technical scheme, the breathable waterproof membrane is an ePTFE membrane, the micr