Medical ultrasonic electrotome cable

Abstract

The embodiment of the utility model provides a medical ultrasonic electrotome cable. The medical ultrasonic electrotome cable comprises an outer sheath, a core wire and a high polymer material wire, wherein the core wire and the high polymer material wire are arranged in the outer sheath; wherein the number of the high polymer material wires is greater than that of the core wires; the high polymer material wire and the core wire are spirally twisted; the core wire comprises an inner-layer center line, an outer-layer center line and an insulating layer; the periphery of the outer-layer center line is coated with the insulating layer, and the periphery of the inner-layer center line is coated with the outer-layer center line; the number of center lines of the inner layer is seven, and the number of center lines of the outer layer is twelve. The center line of the inner layer and the center line of the outer layer are symmetrically arranged along the center axis. According to the application, radial compression resistance and axial flexibility balance are realized through a core wire and high polymer material wire stranded structure; the bending fatigue life is prolonged through layered stranding of the conductor by the inner-layer center line and the outer-layer center line; the winding memorability is eliminated through the high-elasticity outer sheath, and the intraoperative wire arrangement efficiency is improved by more than 40%.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, and in particular to a medical ultrasonic electrosurgical cable. Background Technology

[0002] The ultrasonic scalpel cable is a specialized cable bundle connecting the ultrasonic scalpel handle to the main unit. It transmits ultrasonic energy and high-frequency current, supporting efficient cutting and hemostasis during surgery. As a core component connecting the handle and the main unit, the ultrasonic scalpel cable is responsible for transmitting high-frequency current and ultrasonic energy. Dedicated connectors at both ends of the cable ensure a reliable connection and require regular inspection and maintenance to prevent damage that could affect performance. It is suitable for precise cutting and hemostasis in surgical procedures.

[0003] The ultrasonic cables in the market transmit high-frequency current through independent wire harnesses and use a single-layer braided copper mesh shielding layer.

[0004] However, existing ultrasonic electrosurgical cables have the following problems: they are prone to memory entanglement, increasing the time required for suture management during surgery; the high dielectric constant of the insulation material leads to excessive cable capacitance, affecting the stability of high-frequency signal transmission; and the core wire stranding structure lacks rigidity, making it easy for conductors to break due to repeated bending, affecting the safety of the surgery. Utility Model Content

[0005] In view of the above problems, this utility model embodiment is proposed to provide a medical ultrasonic electrosurgical cable that overcomes or at least partially solves the above problems, including an outer sheath, and core wires and polymer material wires disposed inside the outer sheath; wherein, the number of polymer material wires is greater than the number of core wires; the polymer material wires are spirally twisted with the core wires;

[0006] The core wire includes an inner center wire, an outer center wire, and an insulating layer; the insulating layer covers the outer center wire, and the outer center wire covers the inner center wire; there are 7 inner center wires and 12 outer center wires; the inner center wires and the outer center wires are symmetrically arranged along the central axis.

[0007] Preferably, the polymer material thread is a nylon filament.

[0008] Preferably, there are 5 polymer material wires and 4 core wires.

[0009] Preferably, the outer sheath is a biocompatible, highly elastic PVC sheath.

[0010] Preferably, the pitch ratio of the core wire and the polymer material wire twisted together is 15:1.

[0011] Preferably, the inner layer centerline is a tin-plated copper wire.

[0012] Preferably, the tin-plated copper wire is subjected to annealing treatment.

[0013] Preferably, the outer layer centerline is a tin-plated copper wire.

[0014] Preferably, the core wire and the polymer material wire are provided with a high-temperature resistant strip on their outer layer;

[0015] The outer sheath wraps around the high-temperature resistant belt.

[0016] Preferably, the outer diameter of both the inner layer centerline and the outer layer centerline is in the range of 0.75-0.95 mm.

[0017] This application specifically includes the following advantages:

[0018] In the embodiments of this application, compared with the problems of easy memory winding, excessive capacitance due to high dielectric constant of insulating material, and insufficient rigidity of core wire stranding structure in the prior art, this application provides a solution to achieve a balance between radial compressive strength and axial flexibility in the stranded structure of core wire and polymer material wire. Specifically, it includes an outer sheath, and core wire and polymer material wire disposed inside the outer sheath; wherein, the number of polymer material wires is greater than the number of core wires; the polymer material wires are helically stranded with the core wires; the core wire includes an inner center wire, an outer center wire, and an insulating layer; the insulating layer covers the periphery of the outer center wire, and the outer center wire covers the periphery of the inner center wire; there are 7 inner center wires and 12 outer center wires; the inner center wire and the outer center wire are symmetrically arranged along the central axis. The medical ultrasonic electrosurgical cable of this application has high elasticity, low capacitance, and excellent mechanical properties, and is suitable for high-frequency electrosurgical energy transmission scenarios. This application achieves a balance between radial compressive strength and axial flexibility through a stranded structure of core wire and polymer material wire; improves bending fatigue life by layering conductors with inner and outer center wires; and eliminates entanglement memory through a highly elastic outer sheath, improving intraoperative suture management efficiency by more than 40%. Attached Figure Description

[0019] To more clearly illustrate the technical solution of this application, the drawings used in the description of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a medical ultrasonic electrosurgical cable according to this utility model;

[0021] Figure 2 This is a schematic diagram of the inner centerline structure of a medical ultrasonic electrosurgical cable according to this utility model;

[0022] Figure 3 This is a schematic diagram of the outer centerline structure of a medical ultrasonic electrosurgical cable according to this utility model;

[0023] Figure 4 This is a schematic diagram of the central coil structure of a medical ultrasonic electrosurgical unit cable according to this utility model;

[0024] 1. Outer sheath; 2. High temperature resistant tape; 3. Polymer material wire; 4. Core wire; 41. Insulation layer; 42. Center coil; 421. Inner center wire; 422. Outer center wire. Detailed Implementation

[0025] To make the objectives, features, and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0026] The inventors discovered through analysis of existing technologies that existing ultrasonic electrosurgical cables have the following problems: traditional cables are prone to memory entanglement after bending, increasing the time required for suture management during surgery; the high dielectric constant of the insulation material leads to excessive cable capacitance (>50pF / m), affecting the stability of high-frequency signal transmission; and the core wire stranding structure lacks rigidity, making it easy for conductors to break after repeated bending, affecting the safety of the surgery.

[0027] In the embodiments of this application, compared with the problems of easy memory winding, high dielectric constant of insulating material leading to excessive cable capacitance, and insufficient rigidity of core wire stranding structure in the prior art, this application provides a solution to achieve a balance between radial compressive strength and axial flexibility in the stranded structure of core wire and polymer material wire. Specifically, it includes an outer sheath, and core wire and polymer material wire disposed inside the outer sheath; wherein, the number of polymer material wires is greater than the number of core wires; the polymer material wires are helically stranded with the core wires; the core wire includes an inner center wire, an outer center wire, and an insulating layer; the insulating layer covers the periphery of the outer center wire, and the outer center wire covers the periphery of the inner center wire; there are 7 inner center wires and 12 outer center wires; the inner center wires and the outer center wires are symmetrically arranged along the central axis. This application achieves a balance between radial compressive strength and axial flexibility through a stranded structure of core wire and polymer material wire; improves bending fatigue life by layering conductors with inner and outer center wires; and eliminates entanglement memory through a highly elastic outer sheath, improving intraoperative suture management efficiency by more than 40%.

[0028] Reference Figure 1-4The diagram shows a schematic of the structure of this utility model, which specifically includes the following structure: an outer sheath 1, and core wires 4 and polymer material wires 3 disposed inside the outer sheath 1; wherein, the number of polymer material wires 3 is greater than the number of core wires 4; the polymer material wires 3 and the core wires 4 are spirally twisted together; the core wire 4 includes an inner center wire 421, an outer center wire 422, and an insulating layer 41; the insulating layer 41 covers the periphery of the outer center wire 422, and the outer center wire 422 covers the periphery of the inner center wire 421; there are 7 inner center wires 421 and 12 outer center wires 422; the inner center wires 421 and the outer center wires 422 are symmetrically arranged along a central axis.

[0029] In this embodiment of the application, the core wire 4 and the polymer material wire 3 are inside the outer sheath 1, and the outer sheath 1 is a biocompatible, highly elastic PVC sheath.

[0030] As an example, the high-elasticity PVC sheath eliminates tangling memory, improving intraoperative suture management efficiency by over 40%. The high-elasticity PVC sheath conforms to the ISO 10993 biocompatibility standard, has a Shore hardness of 60±5A, and an elastic recovery rate of ≥95%; the biocompatible PVC material combination achieves low capacitance and memory-free elasticity. The biocompatible high-elasticity PVC sheath has an overall outer diameter of 4.5mm.

[0031] In one specific embodiment, the core lies in the selection and structural optimization of the outer sheath material 1. A biocompatible, highly elastic PVC sheath is used. PVC (polyvinyl chloride) is a general-purpose plastic, but by adding plasticizers, stabilizers, and other modifiers, it can acquire biocompatibility and high elasticity. The ISO 10993 standard, an international standard for medical device biocompatibility, indicates that the material has passed tests for cytotoxicity and sensitization, ensuring safety when in contact with human tissue (such as during surgery or implantation). It is suitable for medical scenarios requiring direct or indirect contact with the human body, such as surgical instrument leads and monitoring equipment cables. The Shore hardness is 60±5A, meaning the hardness range (55A~65A) indicates that the material is moderately soft and hard, providing sufficient support to prevent deformation during surgery while maintaining flexibility to reduce mechanical damage to tissues. Ordinary PVC sheaths typically have a hardness >70A, while silicone is approximately 20A~50A; this design balances flexibility and operability. The material almost completely recovers its original shape after being stretched or bent (e.g., more than 95% spring back after being stretched by 100%), eliminating "tangle memory" (i.e., the cable does not easily maintain a fixed shape due to long-term curling).

[0032] Intraoperative suture management efficiency is improved by 40%. Due to the lack of memory, the sutures are easier to manage quickly during the operation, reducing the time spent on tangling and knotting, and improving surgical efficiency.

[0033] In this embodiment, the core wire 4 and the polymer material wire 3 are provided with a high-temperature resistant strip 2 on their outer layers; the outer sheath 1 wraps around the high-temperature resistant strip 2. The high-temperature resistant strip 2 is a PTFE strip, which is overlapped and wrapped (overlap rate ≥30%) before being extruded into a PVC sheath, with a die temperature of 175°C.

[0034] In one specific embodiment, the temperature resistance and reliability of the cable are improved by introducing a high-temperature resistant tape 2 (PTFE tape) and precise process design. PTFE has a long-term operating temperature range of -200℃ to 260℃ and can withstand short-term temperatures of 300℃ (such as the instantaneous high temperature of electrosurgical equipment), preventing the sheath from melting or deforming due to high temperatures during surgery (such as electrosurgical units or lasers). It is corrosion-resistant and anti-adhesive, reducing tissue adhesion or erosion by disinfectants (such as alcohol or glutaraldehyde) during surgery. When the PTFE tape is spirally wrapped around the core wire 4 and the polymer material wire 3, the overlap width of adjacent tape edges is ≥30%. This design ensures seamless coverage, preventing high-temperature steam or liquid from penetrating into the core wire 4. It guarantees improved mechanical strength, and the overlapping structure enhances bending resistance and prevents the wrapping layer from cracking. Compared with traditional processes, if the overlap rate is <20%, gaps are easily formed due to material shrinkage at high temperatures; if it is >50%, the cable flexibility decreases. The co-processing of PTFE and PVC at a die temperature of 175℃ is ideal. PTFE, with a melting point of approximately 327℃, remains stable at 175℃, while PVC can melt and flow at this temperature (PVC processing temperature is typically 160-200℃). This ensures uniform sheath coverage without damaging the PTFE layer. Too low a temperature (<160℃): Insufficient PVC plasticization results in poor adhesion between the sheath and the PTFE layer, leading to delamination. Too high a temperature (>190℃): While PTFE may not melt, it may accelerate PVC decomposition. Advantages of extrusion process: Interfacial bonding: Molten PVC partially penetrates the PTFE layer through gaps, forming a mechanical interlock and preventing interlayer slippage. Surface smoothness: High-temperature extrusion reduces surface defects in the sheath, facilitating intraoperative cleaning and disinfection.

[0035] As an example, the PTFE tape and the nylon filament twisted structure achieve a balance between radial compressive strength and axial flexibility.

[0036] In this embodiment, the polymer material wire 3 is spirally twisted with the core wire 4, and the polymer material wire 3 is a nylon filament. Four core wires 4 are spirally twisted with five 1000D nylon filaments, and the outer layer is wrapped with a PTFE high-temperature resistant tape 2.

[0037] As an example, nylon filaments are helically stranded with the core wire 4 as the polymer material wire 3. Its main functions are to enhance the mechanical strength, flexibility and fatigue resistance of the cable, and at the same time optimize the overall structural performance. Nylon filaments are a type of synthetic polyamide fiber. Nylon filaments have high tensile strength. The breaking strength of 1000D nylon filaments can reach 8-10 kgf, which can effectively resist external pulling and prevent the cable from being deformed or broken due to traction during the operation. Nylon filaments have good bending properties, making the cable easy to bend and twist during the operation without permanent deformation. The nylon surface is smooth and wear-resistant, reducing surface wear caused by long-term use. Compared with natural fibers, nylon has a low moisture absorption rate, reducing performance fluctuations caused by humidity changes. It is resistant to common disinfectants and is suitable for medical environments. In this embodiment, 1000D nylon filaments (Denier) are used, which means that the weight of the fiber per 9000 meters in length is 1000 grams, belonging to medium to high specifications, taking into account both strength and flexibility.

[0038] In a specific embodiment, 5 1000D nylon filaments are evenly distributed around the core wire 4 to provide structural support. The stranding direction can be S-direction (left-handed) or Z-direction (right-handed), usually opposite to the wrapping direction of PTFE to enhance structural stability.

[0039] In the embodiment of the present application, the number of the polymer material wires 3 is greater than that of the core wires 4; the polymer material wires 3 are helically stranded with the core wires 4; 5 polymer material wires 3 are provided, and 4 core wires 4 are provided. The pitch ratio of the stranding of the core wire 4 and the polymer material wire 3 is 15:1.

[0040] As an example, the core wire 4 is in the shape of a "square", respectively arranged at the four corners, presenting a quadrilateral, and the polymer material wire 3 is in the shape of a "field", arranged around the core wire 4.

[0041] In a specific embodiment, the number of the polymer material wires 3 (5) is more than that of the core wires 4 (4). This design optimizes the mechanical properties and electrical characteristics of the cable through an asymmetric stranding structure. The core wires 4 and the polymer material wires 3 are stranded in a spiral manner, and the pitch ratio is set to 15:1, that is, the stranding pitch is 15 times the stranding diameter. This ratio not only ensures the tightness of stranding to avoid the looseness of the wire, but also ensures sufficient flexibility to meet the intraoperative bending requirements. The core wires 4 are arranged in a "mouth" shape. The four core wires 4 are respectively located at the four diagonal positions of the stranding structure, forming a stable quadrilateral conductive framework. This symmetric layout is beneficial to balancing the electromagnetic field distribution and reducing signal crosstalk. The five polymer material wires 3 are arranged around the core wires 4 in a "field" shape, filling the gaps between the core wires 4 and forming a uniform stress support network. The high tensile strength 1000D specification of the nylon filaments effectively shares the external tensile force and prevents the core wires 4 from being deformed due to excessive stress. At the same time, its low dielectric constant characteristic (ε≈3.5)配合PTFE绕包层(ε≈2.1)进一步降低线缆整体电容,确保高频电信号的传输稳定性。芯线4的“口”字形排布与尼龙丝的“田”字形填充构成机械互补结构:四边形芯线4阵列提供刚性支撑,而尼龙丝的弹性填充则吸收弯折应力,两者协同实现“外柔内刚”的特性,既满足术中对线缆反复弯折的需求,实现弹性恢复率≥95%,又避免因绞合不对称导致的应力集中。此外,5根尼龙丝的冗余设计比芯线4多1根,增强了绞合截面的圆整度,使后续PTFE带绕包,保证搭接率≥30%,时能形成更均匀的耐高温带2,减少护套挤出时的厚度波动。这一结构设计通过材料排布与几何拓扑的精确匹配,在电气绝缘、机械强度和术中操作性之间取得了优化平衡。

[0042] In the embodiment of the present application, the core wire 4 includes an inner layer center line 421, an outer layer center line 422, and an insulating layer 41; the insulating layer 41 is coated around the outer layer center line 422, and the outer layer center line 422 is coated around the inner layer center line 421; 7 inner layer center lines 421 are provided, and 12 outer layer center lines 422 are provided; the inner layer center line 421 and the outer layer center line 422 are symmetrically arranged along the middle axis.

[0043] In a specific embodiment, the central coil 42 includes an outer layer center line 422 and an inner layer center line 421.

[0044] 注:原文中“配合PTFE绕包层(ε≈2.1)进一步降低线缆整体电容”这句话里“配合PTFE绕包层”前面的内容缺失,请补充完整以便准确理解和翻译。上述译文按照现有内容翻译,可能存在部分与原文语义不完全匹配的情况。In this embodiment, the inner centerline 421 is a tin-plated copper wire; the outer centerline 422 is a tin-plated copper wire; the tin-plated copper wire undergoes annealing treatment; the outer diameter of both the inner centerline 421 and the outer centerline 422 ranges from 0.75 to 0.95 mm, preferably 0.85 mm, but can also be 0.75 mm or 0.85 mm. After annealing, the tin-plated copper wire is stranded in a 7+12 configuration using a concentric stranding device.

[0045] As an example, there are 4 independent core wires 4, each core wire 4 consisting of 19 tinned copper wires with a diameter of 0.05mm arranged in a "7+12 layered twisting" pattern, that is, 7 inner center wires 421 and 12 outer center wires 422, as shown. Figure 4 As shown in the figure, 1-7 are the inner layer center lines, 8-19 are the outer layer center lines, and the outer layer is covered with PE insulation layer 41. The outer diameter of a single core wire 4 is 0.85mm.

[0046] In a specific embodiment, the core wire 4 adopts a multi-layer composite structure design. The nylon wire and the core wire 4 are combined and stranded together to synergistically enhance the tensile strength and flexibility. It consists of an inner center line 421 (7 tinned copper wires), an outer center line 422 (12 tinned copper wires), and a PE insulation layer 41. The high dielectric constant of the insulating material causes the capacitance of the cable to exceed the standard (>50 pF / m), which affects the stability of high-frequency signal transmission. High-performance transmission characteristics are achieved through a precision stranding process. The 7 tinned copper wires in the inner layer and the 12 tinned copper wires in the outer layer are strictly arranged in a concentric layer stranding manner (7 + 12 structure). The diameter of all copper wires is controlled at 0.05 mm and undergoes annealing treatment, so that the outer diameter of a single core wire 4 precisely reaches 0.85 mm (tolerance ±0.1 mm). After annealing the tinned copper wires, slow cooling after annealing at 300 - 400 °C significantly improves the ductility and conductivity of the copper wires, effectively reducing signal transmission loss. The thickness of the tin coating is 1 - 3 μm, which enhances the corrosion resistance and prevents the erosion of disinfectants in the medical environment. The 7 copper wires in the inner layer are tightly stranded in a 1 + 6 structure to form a core conductor, and the 12 copper wires in the outer layer completely cover the inner layer in a symmetrical arrangement of 12 surrounding 7. This hierarchical stranding design makes the cross-sectional area of the conductor reach 0.567 mm2, achieving a low DC resistance while maintaining flexibility. The PE insulation layer 41, with a dielectric constant of 2.3 - 2.35, is coated on the stranded conductor by a melt extrusion process with a thickness of 0.15 mm, precisely controlling the outer diameter of a single core wire 4 at 0.85 mm, ensuring sufficient insulation strength and maintaining the overall softness of the cable. The "7 + 12" stranding structure of 4 independent core wires 4配合 the "field" - shaped filling of 5 1000D nylon wires in the outer layer构成 a composite conductive network of 19×4 = 76 tinned copper wires. Through hierarchical and symmetrical stranding, electromagnetic interference is effectively suppressed, and the adjacent crosstalk can be reduced to below -60 dB when the high-frequency electrosurgical device is working. This design realizes a breakthrough balance in the electrical conductivity, mechanical strength, and signal integrity of medical cables through material selection, annealing tinned copper + PE, structural optimization (7 + 12 layer stranding), and process control, namely the triple technology collaboration of concentric stranding and precision extrusion, and is particularly suitable for the connecting cables of minimally invasive surgical instruments that need to simultaneously meet the requirements of high flexibility, anti-interference, and high-temperature sterilization.

[0047] Although the preferred embodiments of the embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications to these embodiments once they know the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

[0048] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0049] The above provides a detailed description of a medical ultrasonic electrosurgical cable provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A medical ultrasonic electrosurgical cable, characterized by, It includes an outer sheath, and core wires and polymer material wires disposed inside the outer sheath; wherein the number of polymer material wires is greater than the number of core wires; the polymer material wires are helically twisted with the core wires; The core wire includes an inner center wire, an outer center wire, and an insulating layer; the insulating layer covers the outer center wire, and the outer center wire covers the inner center wire; there are 7 inner center wires and 12 outer center wires; the inner center wires and the outer center wires are symmetrically arranged along the central axis.

2. The medical ultrasonic electrosurgery cable of claim 1, wherein, The core wire and the polymer material wire are provided with a high-temperature resistant strip on their outer layer; the high-temperature resistant strip is twisted with the polymer material wire; The outer sheath wraps around the high-temperature resistant belt.

3. The medical ultrasonic electrosurgery cable of claim 1, wherein, The polymer material thread is a nylon filament.

4. The medical ultrasonic electrosurgery cable of claim 1, wherein, Five polymer material wires are provided, and four core wires are provided.

5. The medical ultrasonic electrosurgery cord of claim 1, wherein, The outer sheath is a biocompatible, highly elastic PVC sheath.

6. The medical ultrasonic electrosurgery cord of claim 1, wherein, The pitch ratio of the core wire and the polymer material wire twisted together is 15:

1.

7. The medical ultrasonic electrosurgery cord of claim 1, wherein, The inner layer centerline is made of tin-plated copper wire.

8. The medical ultrasonic electrosurgery cord of claim 7, wherein, The tin-plated copper wire undergoes an annealing process.

9. The medical ultrasonic electrosurgery cord of claim 1, wherein, The outer layer centerline is made of tin-plated copper wire.

10. The medical ultrasonic electrosurgery cable of claim 1, wherein, The outer diameter of both the inner and outer layer centerlines ranges from 0.75 to 0.95 mm.

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