Medical blood oxygen monitoring cable

Abstract

This application provides a medical pulse oximetry monitoring cable, relating to the field of cables. It includes a signal line, a power line, a composite ground wire, an inner shielding layer, a middle shielding layer, and an outer shielding layer. The inner and middle shielding layers sequentially cover the signal line. The power line and the composite ground wire are simultaneously twisted around the middle shielding layer. The outer shielding layer covers the power line and the composite ground wire. The inner, middle, and outer shielding layers are made of different shielding materials. This application can meet the anti-interference requirements of pulse oximetry monitoring cables in high-frequency environments and avoid signal distortion caused by electromagnetic crosstalk. It can improve the signal transmission efficiency and performance of pulse oximetry monitoring cables, thereby improving the accuracy of pulse oximetry monitoring.

Description

Technical Field

[0001] This utility model relates to the field of cables, and in particular to a medical blood oxygen monitoring cable. Background Technology

[0002] Blood oxygen saturation (SpO2) monitoring is a key vital sign detection method in clinical medicine, widely used in operating rooms, ICUs, and home monitoring scenarios. Traditional blood oxygen monitoring equipment relies on photoelectric sensors (such as finger clip probes) to transmit photoelectric pulse wave (PPG) signals to the host unit via cables for processing.

[0003] However, existing blood oxygenation cables generally have the following problems: electromagnetic crosstalk is easily generated when the signal line and power line are in the same cable, which leads to signal distortion; and the single-layer shielding structure is difficult to meet the anti-interference requirements in high-frequency environments. Summary of the Invention

[0004] In view of the above problems, this utility model embodiment is proposed to provide a medical blood oxygen monitoring cable that overcomes or at least partially solves the above problems.

[0005] A medical pulse oximetry monitoring cable includes a signal line, a power line, a composite ground wire, an inner shielding layer, a middle shielding layer, and an outer shielding layer. The inner shielding layer and the middle shielding layer sequentially cover the outside of the signal line. The power line and the composite ground wire are synchronously twisted around the outside of the middle shielding layer. The outer shielding layer covers the outside of the power line and the composite ground wire. The inner shielding layer, the middle shielding layer, and the outer shielding layer are made of different shielding materials.

[0006] Preferably, the inner shielding layer is a semi-conductive PVC layer, and the surface resistance of the semi-conductive PVC layer is ≤10 Ω·cm. 3 Ω.

[0007] Preferably, the middle shielding layer is a tin-plated copper wire winding layer, which is spirally wound around the outside of the inner shielding layer, and its coverage is ≥90%.

[0008] Preferably, the outer shielding layer is an aluminum foil layer, which is longitudinally wrapped around the outside of the power line and the composite ground wire, with an overlap rate of ≥25%.

[0009] Preferably, the composite ground wire is formed by simultaneously twisting tin-plated copper wire and nylon wire.

[0010] Preferably, the composite ground wire is formed by synchronously twisting 25 / 0.05TS copper wire and 250D nylon wire.

[0011] Preferably, the signal line is formed by twisting two signal cores together, and the power line is formed by twisting two power cores together; each of the signal cores and each of the power cores includes a conductor layer and a PE insulation layer covering the conductor layer.

[0012] Preferably, it further includes an inner sheath and an outer sheath, wherein the inner sheath covers the outside of the middle shielding layer and the outer sheath covers the outside of the outer shielding layer.

[0013] Preferably, both the inner sheath and the outer sheath are made of medical-grade PVC material.

[0014] Preferably, it also includes two sets of cotton yarn, which are synchronously twisted with the power line, the composite ground wire and the inner sheath in the same direction outside the middle shielding layer.

[0015] This application specifically includes the following advantages:

[0016] In the embodiments of this application, a signal line, a power line, a composite ground wire, an inner shielding layer, a middle shielding layer, and an outer shielding layer are used. The inner shielding layer and the middle shielding layer sequentially cover the outside of the signal line; the power line and the composite ground wire are synchronously twisted around the outside of the middle shielding layer; and the outer shielding layer covers the outside of the power line and the composite ground wire. The inner shielding layer, the middle shielding layer, and the outer shielding layer are made of different shielding materials. By setting three shielding layers and using different shielding materials to form a differentiated shielding structure, the cable shielding performance and anti-interference ability can be improved. By performing staged shielding on the signal line and power line, electromagnetic crosstalk can be avoided while reducing cable noise. Furthermore, by setting a composite ground wire, the mechanical strength of the cable can be improved. This application can meet the anti-interference requirements of blood oxygen monitoring cables in high-frequency environments and avoid signal distortion caused by electromagnetic crosstalk. It can improve the signal transmission efficiency and performance of blood oxygen monitoring cables, thereby improving the accuracy of blood oxygen monitoring. Attached Figure Description

[0017] 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.

[0018] Figure 1 This is a schematic diagram of the structure of the medical blood oxygen monitoring cable of this utility model;

[0019] Attached diagram labels: 1. Signal line; 2. Power line; 3. Composite ground wire; 4. Inner shielding layer; 5. Middle shielding layer; 6. Outer shielding layer; 7. Inner sheath; 8. Outer sheath; 9. Cotton yarn. Detailed Implementation

[0020] 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.

[0021] Reference Figure 1 This diagram illustrates the structure of a medical pulse oximetry monitoring cable according to the present invention. Specifically, it includes the following structure: a signal line 1, a power line 2, a composite ground wire 3, an inner shielding layer 4, a middle shielding layer 5, and an outer shielding layer 6. The inner shielding layer 4 and the middle shielding layer 5 sequentially cover the outside of the signal line 1; the power line 2 and the composite ground wire 3 are synchronously twisted around the outside of the middle shielding layer 5; the outer shielding layer 6 covers the outside of the power line 2 and the composite ground wire 3; wherein the inner shielding layer 4, the middle shielding layer 5, and the outer shielding layer 6 are made of different shielding materials.

[0022] In the embodiments of this application, a signal line 1, a power line 2, a composite ground wire 3, an inner shielding layer 4, a middle shielding layer 5, and an outer shielding layer 6 are used. The inner shielding layer 4 and the middle shielding layer 5 sequentially cover the outside of the signal line 1; the power line 2 and the composite ground wire 3 are synchronously twisted around the outside of the middle shielding layer 5; and the outer shielding layer 6 covers the outside of the power line 2 and the composite ground wire 3. The inner shielding layer 4, the middle shielding layer 5, and the outer shielding layer 6 are made of different shielding materials. By setting three shielding layers and using different shielding materials to form a differentiated shielding structure, the cable shielding performance and anti-interference ability can be improved. By performing staged shielding on the signal line 1 and the power line 2, electromagnetic crosstalk can be avoided while reducing cable noise. Furthermore, by setting the composite ground wire 3, the mechanical strength of the cable can be improved. This application can meet the anti-interference requirements of blood oxygen monitoring cables in high-frequency environments and avoid signal distortion caused by electromagnetic crosstalk, thereby improving the signal transmission efficiency and performance of blood oxygen monitoring cables and ultimately improving the accuracy of blood oxygen monitoring.

[0023] The following will further describe a medical blood oxygen monitoring cable in this exemplary embodiment.

[0024] In this embodiment, a three-layer composite shielding structure, combined with differentiated shielding design, is employed to achieve high shielding and high anti-interference performance for the blood oxygen monitoring cable. The three-layer composite shielding structure includes an inner shielding layer 4, a middle shielding layer 5, and an outer shielding layer 6. The inner and middle shielding layers 4 and 5 sequentially cover the signal line 1, providing initial shielding. The power line 2 and the composite ground line 3 are simultaneously twisted together outside the middle shielding layer 5, effectively separating the signal line 1 and the power line 2 through two shielding layers to prevent electromagnetic crosstalk between them, which could lead to signal distortion. The outer shielding layer 6 covers the power line 2 and the composite ground line 3, shielding them from the external high-frequency environment. The inner shielding layer 4, the middle shielding layer 5, and the outer shielding layer 6 are made of different shielding materials, enabling staged shielding between the signal line 1 and the power line 2, reducing common-mode noise by more than 60% (measured data). Simultaneously, the differentiated shielding structure enhances anti-interference performance. Furthermore, the composite ground wire 3 can improve the mechanical strength of the cable, avoiding the problem of poor cable contact due to low mechanical strength of the ground wire, which can easily lead to poor cable contact due to pulling, thus affecting blood oxygen monitoring.

[0025] As an example, the aforementioned inner shielding layer 4 is a semi-conductive PVC layer, specifically, its outer diameter is 1.33 mm, and its surface resistivity is ≤10 Ω·cm. 3 Ω can suppress partial discharge, prevent corrosion of insulating materials and signal interference, and affect the measurement accuracy of medical equipment (such as pulse oximeters).

[0026] As an example, the aforementioned shielding layer 5 is a tin-plated copper wire winding layer. Specifically, the tin-plated copper wire winding layer is spirally wound around the outside of the inner shielding layer 4, with a single wire diameter of 0.05mm, a coverage rate of ≥90%, and a braiding angle of 45°±5°. The copper wire winding layer can provide intermediate frequency shielding, which refers to shielding against electromagnetic interference (EMI) in the frequency range of 300kHz~30MHz. It can suppress intermediate frequency noise in scenarios such as medical equipment, improve anti-interference capability, and thus improve signal reliability.

[0027] As an example, the outer shielding layer 6 is an aluminum foil layer. Specifically, the aluminum foil layer is longitudinally wrapped around the outside of the power line 2 and the composite ground line 3. It is 8mm wide and has an overlap rate of ≥25%, forming a full-circumferential electromagnetic shield that can block high-frequency interference. It is combined with the inner shielding layer 4 and the middle shielding layer 5 to form a differentiated shielding structure, thereby meeting the anti-interference requirements in high-frequency environments.

[0028] As an example, the aforementioned composite ground wire 3 is formed by simultaneously twisting tinned copper wire and nylon wire. Specifically, it is formed by simultaneously twisting 25 / 0.05TS copper wire and 250D nylon wire to enhance tensile strength. Compared to existing blood oxygen monitoring cables, the addition of nylon wire to the ground wire in this embodiment can increase the tensile strength by 300% (actual measured data).

[0029] As an example, the cable in this embodiment also includes an inner sheath 7 and an outer sheath 8. The inner sheath 7 covers the outside of the middle shielding layer 5, and the outer sheath 8 covers the outside of the outer shielding layer 6. This double-layer sheath structure, covering both the signal line 1 and the power line 2 respectively, works in conjunction with the triple-layer shielding structure to achieve efficient protection for the signal line 1 and the power line 2, as well as excellent electromagnetic crosstalk prevention.

[0030] Furthermore, both the inner sheath 7 and the outer sheath 8 are made of medical-grade PVC material (compliant with ISO 10993 biocompatibility standard), and the outer diameter of the inner sheath 7 is controlled at 1.85mm and the outer diameter of the outer sheath 8 is controlled at 3.42mm. This can improve the structural compactness and avoid the insufficient biocompatibility of existing blood oxygen monitoring cables, which may cause allergies with long-term use.

[0031] As an example, the cable in this embodiment also includes two sets of cotton yarn 9, which are synchronously twisted with the power line 2, the composite ground wire 3 and the inner sheath 7 in the same direction outside the middle shielding layer 5.

[0032] As an example, the signal line 1 is formed by twisting two signal line 1 cores together, and the power line 2 is formed by twisting two power line 2 cores together; each of the signal line 1 cores and each of the power line 2 cores includes a conductor layer and a high-density PE insulation layer covering the conductor layer.

[0033] In one specific embodiment, the manufacturing process of the blood oxygen monitoring cable is as follows:

[0034] First, the conductor is processed:

[0035] Signal line 1 / Power line 2: 10 strands of 0.08mm tinned copper wires are twisted together and extruded with high-density PE insulation (extrusion temperature 195℃±5℃) to form signal line 1 core and conductor core respectively.

[0036] Composite ground wire 3: 25 strands of 0.05mm tin-plated copper wire and nylon wire are twisted together synchronously with a twist pitch of 15D.

[0037] Secondly, the cabling process is carried out:

[0038] Two signal wires are twisted together with a twist pitch of 12mm and then wrapped with a semi-conductive PVC layer to form an inner shielding layer 4. Tinned copper wire is spirally wound around the outside of the semi-conductive PVC layer at a winding density of 28 turns / inch to form a middle shielding layer 5.

[0039] The inner sheath 7 wire group is twisted in an S-direction with two parallel power lines 2, a composite ground wire 3, and two sets of cotton yarns 9, with a twist pitch of 27mm, and simultaneously wrapped with aluminum foil to form an outer shielding layer 6. Then, an outer sheath 8 is extruded outside the outer shielding layer 6, and the die temperature is controlled at 180℃±3℃ during extrusion.

[0040] Beneficial effects of the embodiments in this application:

[0041] 1. Differentiated shielding design:

[0042] The semi-conductive PVC layer suppresses partial discharge, the copper wire winding layer provides mid-frequency shielding, and the aluminum foil layer blocks high-frequency interference, thereby greatly improving the cable's high shielding and high anti-interference performance and meeting the anti-interference requirements in high-frequency environments.

[0043] 2. Safety redundancy design:

[0044] The power line 2 and signal line 1 are shielded in stages to avoid electromagnetic crosstalk that could cause signal distortion and reduce common-mode noise by more than 60%.

[0045] 3. Mechanical strengthening:

[0046] The addition of nylon filaments to the ground wire forms a composite ground wire 3, which increases the tensile strength of the cable by 300%.

[0047] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope 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 blood oxygen monitoring 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 pulse oximetry monitoring cable, characterized in that, The shield includes a signal line, a power line, a composite ground wire, an inner shielding layer, a middle shielding layer, and an outer shielding layer. The inner shielding layer and the middle shielding layer sequentially cover the outside of the signal line. The power line and the composite ground wire are simultaneously twisted together outside the middle shielding layer. The outer shielding layer covers the outside of the power line and the composite ground wire. The inner shielding layer, the middle shielding layer, and the outer shielding layer are made of different shielding materials.

2. The medical blood oxygen monitoring cable according to claim 1, characterized in that, The inner shielding layer is a semi-conductive PVC layer, and the surface resistance of the semi-conductive PVC layer is ≤10. 3 Ω.

3. The medical blood oxygen monitoring cable according to claim 2, characterized in that, The middle shielding layer is a tin-plated copper wire winding layer, which is spirally wound around the outside of the inner shielding layer, with a coverage of ≥90%.

4. The medical blood oxygen monitoring cable according to claim 3, characterized in that, The outer shielding layer is an aluminum foil layer, which is longitudinally wrapped around the outside of the power line and the composite ground wire, with an overlap rate of ≥25%.

5. The medical blood oxygen monitoring cable according to claim 1, characterized in that, The composite ground wire is formed by simultaneously twisting tin-plated copper wire and nylon wire.

6. The medical pulse oximetry monitoring cable according to claim 5, characterized in that, The composite ground wire is formed by synchronously twisting 25 / 0.05TS copper wire and 250D nylon wire.

7. The medical blood oxygen monitoring cable according to claim 1, characterized in that, The signal line is formed by twisting two signal cores together, and the power line is formed by twisting two power cores together; each of the signal cores and each of the power cores includes a conductor layer and a PE insulation layer covering the conductor layer.

8. The medical pulse oximetry monitoring cable according to any one of claims 1-7, characterized in that, It also includes an inner sheath and an outer sheath, wherein the inner sheath covers the outside of the middle shielding layer and the outer sheath covers the outside of the outer shielding layer.

9. The medical blood oxygen monitoring cable according to claim 8, characterized in that, Both the inner and outer sheaths are made of medical-grade PVC material.

10. The medical blood oxygen monitoring cable according to claim 8, characterized in that, It also includes two sets of cotton yarn, which are twisted synchronously with the power line, the composite ground wire and the inner sheath in the same direction outside the middle shielding layer.

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