A clamp for blood index detection

Abstract

The utility model discloses a kind of clamps for blood index detection, including open-close type light shielding clamp body, open-close type light shielding clamp body includes left half light shield shell and right half light shield shell, which are mutually perpendicular rotationally connected at top, the opposite side of left half light shield shell and right half light shield shell is all provided with half hole, two half holes are enclosed and are adapted to the pipe hole of blood circulation pipe;Light source and photoelectric detector are respectively arranged on the position of open-close type light shielding clamp body and about the symmetry of blood circulation pipe, light source and photoelectric detector are aligned. The clamp for blood index detection described above can avoid external environmental interference, and ensure that light source and photoelectric detector are aligned under the action of clamp, realize the anti-interference, high-precision and convenient operation of blood index detection, blood cell pressure accumulation and SO2 optical detection.

Description

Technical Field

[0001] This utility model relates to the field of blood index detection technology, and in particular to a clamp for blood index detection. Background Technology

[0002] Extracorporeal membrane oxygenation (ECMO), as a core life support technology for respiratory and circulatory function support in critically ill patients, relies heavily on the real-time and accurate monitoring of blood physiological parameters—hematocrit (HCT) and oxygen saturation (SO2)—for its effectiveness. Currently, in clinical practice and extracorporeal circulation simulations, HCT and SO2 detection primarily rely on near-infrared spectroscopy (NIRS) optical detection technology. Such optical detection systems typically include a light source, photodetector, monitoring probe, and fixation device (i.e., existing clamps). The clamp, as a key component connecting the artificial vascular access and the optical detection assembly, needs to achieve the dual function of "fixing the tubing + ensuring the optical path." However, its existing design has many technical defects that directly limit detection accuracy and system stability. 1. Insufficient suppression of ambient light interference, resulting in low signal-to-noise ratio: Existing fixtures mostly use non-light-shielding materials, which can only initially block light and cannot effectively absorb or filter stray ambient light (such as indoor white light in clinical environments and indicator light from equipment). Optical detection requires extremely high purity of light signals. The mixing of stray light will directly interfere with the accurate acquisition of transmitted light intensity, leading to deviations in absorbance calculation, and thus causing errors in HCT and SO2 detection.

[0003] 2. Poor optical path alignment accuracy and insufficient coordination between the light source and detector: HCT and SO2 detection require the light emitted by the light source to penetrate the blood in the blood flow tube perpendicularly and be strictly coaxial with the photodetector to ensure optical path stability (compliant with the "constant optical path" assumption in Lambert-Beer's law). To achieve precise coaxial alignment of the light source and detector in existing fixtures would be extremely difficult to design, resulting in an overly complex structure. This would not only significantly increase manufacturing and assembly costs but also raise the difficulty of subsequent maintenance and calibration.

[0004] In summary, existing fixtures for HCT and SO2 optical detection in blood marker testing suffer from drawbacks such as weak anti-interference capabilities, poor optical path alignment, and insufficient adaptability and stability, directly limiting detection accuracy and system practicality. Therefore, there is an urgent need for a novel fixture with high-efficiency anti-interference capabilities, precise optical path positioning, good tubing adaptability, and stable clamping performance to address the pain points of existing technologies, provide reliable structural support for high-precision HCT and SO2 detection, and ultimately enhance the clinical reference value of blood marker testing systems. Utility Model Content

[0005] The purpose of this invention is to provide a clamp for blood index testing to solve the above-mentioned technical problems.

[0006] To achieve the above objectives, this utility model provides a blood index detection fixture, including an openable light-shielding fixture body. The openable light-shielding fixture body includes a left half light-shielding cover and a right half light-shielding cover that are rotatably connected at their top ends. Half holes are provided on opposite sides of the left half light-shielding cover and the right half light-shielding cover, and the two half holes form a tube hole adapted to the blood flow tube. The light-shielding clamp body is equipped with a light source and a photodetector at symmetrical positions about the blood flow tube, and the light source and photodetector are aligned.

[0007] Preferably, the bottom ends of the left half of the light-shielding cover and the right half of the light-shielding cover are magnetically connected.

[0008] Preferably, a protruding magnet is fixed at the bottom of the left half of the light-shielding cover and on the side facing the right half of the light-shielding cover, and a recessed magnet is embedded at the bottom of the right half of the light-shielding cover and on the side facing the left half of the light-shielding cover. The protruding magnet extends into the recessed magnet and is magnetically connected to the recessed magnet.

[0009] Preferably, the openable light-shielding clamp body is also provided with lead wires that are electrically connected to the light source and photodetector.

[0010] Preferably, the light source is a laser diode array uniformly arranged along the direction of blood flow; The photodetector includes fiber optic probes that correspond one-to-one with the laser diode array, and the fiber optic probes are attached to the outer wall of the blood flow tube via filters.

[0011] Preferably, the body of the openable light-blocking clamp is made of black PVC, ABS, PP, PC or PA material; Silicone layers are adhered to the inner walls of the half-holes in both the left and right halves of the light-shielding cover.

[0012] Therefore, the advantages of this utility model using the above-mentioned clamp for blood index detection are as follows: 1. Effectively suppresses ambient light interference and improves the signal-to-noise ratio of the detection signal: The openable light-shielding fixture is made of black PVC material, which can absorb stray ambient light (such as indoor white light and equipment indicator light) in clinical or simulated scenarios to the maximum extent, preventing stray light from mixing into the detection optical path, providing a clean optical path environment for the accurate calculation of HCT and SO2 absorbance, and reducing detection errors. 2. Precise optical path alignment ensures stable detection data: On the one hand, the left and right halves of the light-shielding cover of the fixture are connected by vertical rotation at the top to open and close, while the bottom adopts an embedded magnetic attraction structure with convex and concave magnets. When closed, it can ensure that the left and right halves of the shell are precisely aligned, avoiding optical path deviation due to loose clamping. On the other hand, the laser diode array and the fiber optic probe with filter correspond one-to-one, and the fiber optic probe is attached to the outer wall of the tube to ensure that the specific wavelength of light emitted by the light source penetrates the blood vertically and is accurately received, which meets the requirement of "constant optical path" of Lambert-Beer law and reduces optical signal attenuation or distortion. 3. Adapt to pipe size tolerances and enhance clamping stability: The inner walls of the half-holes of the left and right halves of the light-shielding cover are bonded with silicone layers, which can compensate for batch size tolerances of the blood flow tube (such as slight deviations in pipe diameter) through elastic deformation. This avoids damage to the pipe by rigid clamping and ensures that the pipe fits tightly against the inner wall of the clamp, preventing optical path fluctuations caused by pipe displacement under blood flow impact and improving detection repeatability. 4. Simplify operation and system integration, and improve ease of use: The openable structure facilitates quick loading and unloading of blood flow tubes without complicated disassembly steps; the clamp body integrates lead wires for electrical connection with the light source and photoelectric detector, which can be directly connected to the back-end detection system (power supply and signal processing module), eliminating the need for additional wiring and reducing operational complexity. 5. Optimize optical signal acquisition quality to support high-precision parameter detection: The light source is a laser diode array uniformly arranged along the pipeline axis, which can ensure that the detection light uniformly covers the pipeline detection cross section and avoid detection deviation caused by uneven local light intensity; the fiber optic probe of the photodetector has a built-in filter, which can further filter out non-target wavelength stray light and ensure that the received signal is only the effective detection light that penetrates the blood, providing a high-quality signal foundation for the subsequent accurate calculation of HCT and SO2.

[0013] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0014] Figure 1 This is a perspective view of a blood index detection fixture according to the present invention. Figure 2 This is a perspective view of a blood index detection fixture according to the present invention. Figure 3 This is an axial sectional view of a blood index detection fixture according to the present invention.

[0015] Figure Labels 1. Left half of the light-shielding cover; 2. Light source; 3. Right half of the light-shielding cover; 4. Lead wire; 5. Recessed magnet; 6. Through hole; 7. Raised magnet; 8. Photodetector; 9. Filter; 10. Blood flow tube. Detailed Implementation

[0016] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0017] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0018] like Figures 1-3 As shown, a blood index detection fixture includes an openable light-shielding fixture body. The openable light-shielding fixture body includes a left half light-shielding cover 1 and a right half light-shielding cover 3 that are rotatably connected to each other at their top ends. Half holes are opened on opposite sides of the left half light-shielding cover 1 and the right half light-shielding cover 3. The two half holes form a through hole 6 that is adapted to the blood flow tube 10. A light source 2 and a photodetector 8 are respectively arranged on the openable light-shielding fixture body at symmetrical positions about the blood flow tube 10. The light source 2 and the photodetector 8 are aligned.

[0019] The bottom ends of the left half of the light-shielding cover 1 and the right half of the light-shielding cover 3 are magnetically connected.

[0020] A raised magnet 7 is fixed at the bottom of the left half of the light-shielding cover 1 and on the side facing the right half of the light-shielding cover 3. A recessed magnet 5 is embedded at the bottom of the right half of the light-shielding cover 3 and on the side facing the left half of the light-shielding cover 1. The raised magnet 7 extends into the recessed magnet 5 and is magnetically connected with the recessed magnet 5 to ensure that the opening and closing light-shielding clamp body is tightly closed.

[0021] The openable light-shielding clamp body is also equipped with lead wires 4 that are electrically connected to the light source 2 and the photodetector 8.

[0022] The light source 2 is a laser diode array uniformly arranged along the axial direction of the blood flow tube 10; the photodetector 8 includes an optical fiber probe that corresponds one-to-one with the laser diode array, and the optical fiber probe is attached to the outer wall of the blood flow tube 10 through the filter 9.

[0023] The main body of the openable light-shielding clamp is made of black PVC, ABS, PP, PC or PA material to absorb ambient stray light to the maximum extent and avoid interference of external light source 2 with transmitted light signal; silicone layer is bonded to the inner wall of the half hole of the left half light-shielding cover 1 and the right half light-shielding cover 3 to ensure that the inner wall of the main body of the openable light-shielding clamp (through hole 6) is in close contact with the outer wall of the blood flow tube 10.

[0024] It should be noted that the choice of material for the body of the above-mentioned openable light-shielding clamp is only an example and should not be construed as a limitation on the material by those skilled in the art.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solution of this utility model, and these modifications or equivalent substitutions cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of this utility model.

Claims

1. A clamp for detecting blood indicators, characterized in that: The device includes an openable light-shielding clamp body, which includes a left half light-shielding cover and a right half light-shielding cover that are rotatably connected at their top ends. Half holes are provided on opposite sides of the left half light-shielding cover and the right half light-shielding cover, and the two half holes form a tube hole that is adapted to the blood flow tube. The light-shielding clamp body is equipped with a light source and a photodetector at symmetrical positions about the blood flow tube, and the light source and photodetector are aligned.

2. The blood index detection fixture according to claim 1, characterized in that: The bottom ends of the left and right half of the light-shielding cover are magnetically connected.

3. A blood index detection fixture according to claim 2, characterized in that: A raised magnet is fixed at the bottom of the left half of the light-shielding cover and on the side facing the right half of the light-shielding cover. A recessed magnet is embedded at the bottom of the right half of the light-shielding cover and on the side facing the left half of the light-shielding cover. The raised magnet extends into the recessed magnet and is magnetically connected to the recessed magnet.

4. A blood index detection fixture according to claim 1, characterized in that: The openable light-shielding clamp body is also equipped with lead wires that are electrically connected to the light source and photodetector.

5. A blood index detection fixture according to claim 1, characterized in that: The light source is a laser diode array uniformly arranged along the direction of blood flow; The photodetector includes fiber optic probes that correspond one-to-one with the laser diode array, and the fiber optic probes are attached to the outer wall of the blood flow tube via filters.

6. A blood index detection fixture according to claim 1, characterized in that: The main body of the opening and closing light-blocking clamp is made of black PVC, ABS, PP, PC or PA material; Silicone layers are adhered to the inner walls of the half-holes in both the left and right halves of the light-shielding cover.

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