Tissue blood oxygen sensor

Abstract

The utility model discloses a tissue blood oxygen sensor which comprises a light source probe, a photoelectric detector probe, a cable and a probe fixing sleeve. The light source probe comprises a light source and a light source protection sleeve, the cable comprises a main cable and two branch cables, and the light source protection sleeve and the photoelectric detector protection sleeve are sleeved with the ends of the two branch cables respectively; two grooves are formed in the surface of the probe fixing sleeve, and a gap exists between the two grooves; the shapes of the two grooves are the same as those of the light source probe and the photoelectric detector probe, and the two grooves are used for embedding and fixing the light source probe and the photoelectric detector probe. The probe fixing sleeve can be prepared into different sizes, and after the same tissue blood oxygen sensor probe is matched with the probe fixing sleeves with different sizes, the distance between a light source and a photoelectric detector can be adjusted, so that optimal distance coupling for different crowds and different measurement positions is realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical devices, and particularly relates to a tissue blood oxygen sensor. Background Art

[0002] A tissue blood oxygen monitor based on near-infrared spectroscopy (NIRS) technology is a medical monitoring device that has gradually emerged in recent years. This type of device can continuously, non-invasively, and real-time monitor the blood oxygen parameters of local tissues (such as brain tissue) (mainly tissue blood oxygen saturation and the change amount of hemoglobin concentration). A tissue blood oxygen sensor (or tissue blood oxygen probe) is an important component of a tissue blood oxygen monitor. It contacts the human skin and performs optoelectronic information conversion, which is the basis for realizing NIRS measurement. Due to algorithm requirements, there is at least one light source and two photodetectors at different distances from the light source on the tissue blood oxygen sensor. The light source is usually a multi-wavelength (at least 2 wavelengths) near-infrared light-emitting diode (LED), and the photodetector is usually a silicon photodiode. The distance between the light source and the photodetector determines the maximum depth of light penetration through the skin, and also greatly affects the intensity and signal-to-noise ratio of the measurement signal, which is an important coefficient for solving blood oxygen parameters.

[0003] For different populations (such as infants, children, adults) and different measurement positions (such as the head, leg muscles, abdominal organs), the optimal coupling distance between the light source and the photodetector will be different. For example, when measuring the tissue blood oxygen parameters of an infant's head, since the infant's head circumference is relatively small and the skull is relatively thin, the distances between the light source and the two photodetectors are 20 mm and 30 mm respectively, which are more ideal. When measuring the tissue blood oxygen parameters of an adult's head, it is more appropriate to adjust the distances to 30 mm and 40 mm. At the same time, the firmness and stability of the optoelectronic devices of the tissue blood oxygen sensor fixed on the skin and the light-shielding performance against external environmental light interference have a very great impact on the measurement accuracy of tissue blood oxygen parameters. For example, a one-piece tissue blood oxygen probe is disclosed in Patent CN204158399U. However, the distance between the optoelectronic devices of this one-piece tissue blood oxygen probe is fixed and cannot be adjusted after being manufactured; and the area of the probe body is relatively small, and the light-shielding effect is not good. Summary of the Utility Model

[0004] The first object of the utility model is to provide a tissue blood oxygen sensor with adjustable distances between the light source and the photodetector, which can achieve the optimal distance coupling for different populations and different measurement positions.

[0005] The utility model adopts the following technical solutions:

[0006] A tissue blood oxygen sensor includes: a light source probe, a photodetector probe, a cable, and a probe fixing sleeve;

[0007] The light source probe includes a light source, and the photodetector probe includes a photodetector;

[0008] The cable includes a main cable and two branch cables, and the end parts of the two branch cables are respectively connected to the light source and the photodetector;

[0009] The surface of the probe fixing sleeve is provided with two grooves, and there is a spacing between the two grooves; the shapes of the two grooves are respectively the same as those of the light source probe and the photodetector probe, and are used for inlaying and fixing the light source probe and the photodetector probe.

[0010] Preferably, the two branch cables have the same length, and the photodetector and the light source are arranged in a straight line.

[0011] Preferably, the number of photodetectors is greater than or equal to 2, and the same spacing exists between adjacent photodetectors; preferably, the center spacing of the photodetectors is 10 mm.

[0012] Preferably, the size of the probe fixing sleeve and the center distance between the two grooves are adjustable, so as to achieve the best distance coupling for different people and different measurement positions.

[0013] Preferably, the light source probe further includes a light source protective sleeve, and the light source is arranged inside the light source protective sleeve; the photodetector probe further includes a photodetector protective sleeve, and the photodetector is arranged inside the photodetector protective sleeve.

[0014] Preferably, a wire protection sleeve is provided outside the cable; the light source protective sleeve and the photodetector protective sleeve are respectively sleeved at the end parts of the wire protection sleeve.

[0015] Preferably, the light source protective sleeve, the photodetector protective sleeve and the probe fixing sleeve are all made of flexible and light-tight materials.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0017] 1) The overall strength of the tissue blood oxygen probe manufactured by the method of the present utility model is high, the electronic devices are completely sealed, and it can withstand hundreds of times of conventional disinfection and can be reused, thereby reducing the single-use cost of the tissue blood oxygen sensor;

[0018] 2) The present utility model is provided with a probe fixing sleeve. The same tissue blood oxygen sensor probe can be paired with probe fixing sleeves of different sizes, which can adjust the distance between the light source and the photodetector, achieving the best distance coupling for different populations and different measurement positions. Compared with manufacturing tissue blood oxygen sensor probes with different spacings, the preparation cost is greatly reduced. The probe fixing sleeve is made of a flexible material and can be bent to a certain extent, enabling the optoelectronic devices on the sensor to closely fit various measurement parts such as the head and body.

[0019] 3) Both the protective sleeve and the probe fixing sleeve of the present utility model are made of black light-tight materials, which have a good light-shielding effect, making the tissue blood oxygen sensor less susceptible to external ambient light and improving the stability and accuracy of measurement. Description of the Drawings

[0020] Figure 1 is the overall structure diagram of the present utility model.

[0021] Figure 2 is the structure diagram of the light source probe of the present utility model.

[0022] Figure 3 is the structure diagram of the photodetector probe of the present utility model.

[0023] Figure 4 is the structure diagram of the present utility model after removing the probe fixing sleeve.

[0024] Figure 5 is the structure diagram of the probe fixing sleeve of the present utility model.

[0025] Reference numerals in the drawings: 1, main cable; 2, splitter; 3, branch cable; 301, cable protection sleeve; 4, light source probe; 401, light source; 402, light source protection sleeve; 5, photodetector probe; 501, photodetector; 502, photodetector protection sleeve; 6, probe fixing sleeve; 601, light source probe groove; 602, photodetector probe groove. Detailed Embodiment

[0026] The following further describes the present utility model with reference to the drawings and embodiments.

[0027] Please refer to Figure 1 and 4 , this embodiment provides a tissue blood oxygen sensor, including: a light source probe 4, a photodetector probe 5, a cable, and a probe fixing sleeve 6;

[0028] Please refer to Figure 2 and 3, the light source probe 4 includes a light source 401 and a light source protective sleeve 402. The light source 4 is disposed inside the light source protective sleeve 402, and the light source 4 uses a multi-band light emitting diode; the photodetector probe 5 includes a photodetector 501 and a photodetector protective sleeve 502. The photodetector 501 is disposed inside the photodetector protective sleeve 502; the number of the photodetectors 501 is greater than or equal to 2, and there is the same spacing between adjacent photodetectors;

[0029] The cable includes a main cable 1 and two branch cables 3. The ends of the two branch cables 3 are respectively sleeved with the light source protective sleeve 402 and the photodetector protective sleeve 502; the lengths of the two branch cables 3 are the same, and the photodetectors 501 and the light source 401 are arranged in a straight line;

[0030] Please refer to Figure 5 , two grooves are formed on the surface of the probe fixing sleeve 6, namely a light source probe groove 601 for accommodating the light source probe and a photodetector probe groove 602 for accommodating the photodetector probe, and there is a spacing between the two grooves; the shapes of the two grooves are the same as those of the light source probe 4 and the photodetector probe 5 respectively, and are used for inlaying and fixing the light source probe 4 and the photodetector probe 5.

[0031] In this embodiment, two photodetectors 501 are provided, and the spacing between the two photodetectors 501 is 10 mm.

[0032] The center distance between the two grooves can be adjusted by preparing different probe fixing sleeves 6, so as to achieve the best distance coupling for different people and different measurement positions; taking this embodiment as an example, in this embodiment, when the tissue blood oxygen sensor is used to measure the tissue blood oxygen parameters of an adult's head, the center distance between the light source probe groove 601 and the photodetector probe groove 602 is 35 mm; when the tissue blood oxygen sensor is used to measure the tissue blood oxygen parameters of a child's head, the center distance between the two grooves, namely the light source probe groove 601 and the photodetector probe groove 602, is 25 mm.

[0033] The light source protective sleeve 402, the photodetector protective sleeve 502 and the probe fixing sleeve 6 are all made of flexible and light-tight materials, such as silica gel, TPU or PVC. In this embodiment, black silica gel is used.

[0034] The following is an exemplary description of the manufacturing method of the tissue blood oxygen sensor of the present invention, including:

[0035] 1) Strip the outer sheath and the shielding layer at about 10 cm from the end of the shielded cable used for the tissue blood oxygen sensor;

[0036] 2) Divide the cable core wire into two strands. One strand is used for the core wire of the light source 401, and the other strand is used for the core wires of the two photodetectors 501. Pass the two strands of core wires through the splitter 2, and the splitter 2 can be injection-molded with silicone, TPU or PVC;

[0037] 3) Sheath the outer parts of the two strands of core wires with soft wire protection sleeves 301 respectively to form a branched cable 3; the wire protection sleeves can be made of silicone, TPU or PVC materials. The inner wire diameter of the wire protection sleeve should be such that all the core wires can pass through easily but without leaving too much space;

[0038] 4) Pass the core wire used for the light source 401 through the mesh end of the light source protection sleeve 402, and at the same time stuff the wire protection sleeve into the mesh end. The light source protection sleeve is injection-molded with silicone, black and light-impermeable, and hollow inside;

[0039] 5) Pass the core wire used for the photodetector 501 through the photodetector protection sleeve 502, and at the same time stuff the wire protection sleeve into the mesh end. The photodetector protection sleeve is injection-molded with silicone, black and light-impermeable, and hollow inside;

[0040] 6) Solder the core wire used for the light source 401 and the light source (i.e., the multi-band light-emitting diode) to the customized PCB, then stuff the PCB into the light source protection sleeve 402, and adjust the position so that the light-emitting diode is located at the center of the protection sleeve, and the upper surface of the light-emitting diode is flush with the surface of the protection sleeve;

[0041] 7) Solder the core wire used for the photodetector 501 and the two photodetectors 501 to the customized PCB, then stuff the PCB into the photodetector protection sleeve 502, and adjust the position so that the centers of the two photodetectors are located at the center of the protection sleeve, and the upper surfaces of the two photodetectors are flush with the surface of the protection sleeve;

[0042] 8) Pour black liquid silicone into the light source protection sleeve 402 and the photodetector protection sleeve 502 to fill the hollow area inside. Let it stand for several hours. After the silicone is completely solidified, the protection sleeve and the internal devices and cables form a sealed whole. The overall strength of the probe is high, and the internal solder joints are not easy to fall off and oxidize; the made whole can be called a tissue blood oxygen sensor probe;

[0043] 9) Separate the probe fixing sleeve 6 is made. There are a light source probe groove 601 and a photodetector probe groove 602 in the fixing sleeve, and the light source probe 4 and the photodetector probe 5 on the tissue blood oxygen sensor probe can be embedded into it to fix the positions of the optoelectronic devices; the probe fixing sleeve 6 is injection-molded with a flexible material (such as silicone, TPU or PVC).

[0044] When the utility model is in use, the light source probe 4 and the photodetector probe 5 are respectively embedded into the light source probe groove 601 and the photodetector probe groove 602, and then pasted on the body surface of the tissue to be measured of the object to be measured (such as the forehead of the head). The flexible probe fixing sleeve 6 can be fitted with the human skin. At this time, the light source 401 emits a light signal, and the photodetector 501 receives the light signal. By calculating the light intensity value received by the photodetector 501, the blood oxygen parameters in the tissue of the subject can be obtained.

[0045] The above-mentioned embodiments are only specific implementation manners of the utility model, which are used to illustrate the technical solutions of the utility model, rather than to limit it. The protection scope of the utility model is not limited thereto.

[0046] Although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: any person skilled in the art within the technical scope disclosed by the present utility model can still modify the technical solutions recorded in the foregoing embodiments, or can easily think of changes, or make equivalent replacements for some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present utility model, and should all be covered by the protection scope of the present utility model.

Claims

1. A tissue blood oxygen sensor, comprising: A light source probe (4), a photoelectric detector probe (5), a cable and a probe fixing sleeve (6); characterized in that: The light source probe (4) comprises a light source (401), and the photoelectric detector probe (5) comprises a photoelectric detector (501); The cable comprises a main cable (1) and two branch cables (3), and ends of the two branch cables (3) are respectively connected to the light source (401) and the photodetector (501); The surface of the probe fixing sleeve (6) is provided with a light source probe groove (601) and a photoelectric detector probe groove (602), and there is a distance between the two grooves; the shapes of the light source probe groove (601) and the photoelectric detector probe groove (602) are respectively the same as those of the light source probe (4) and the photoelectric detector probe (5); The center distance between the light source probe groove (601) and the photoelectric detector probe groove (602) is adjustable.

2. The tissue blood oxygen sensor according to claim 1, characterized in that: The two branch cables (3) have the same length, and the photoelectric detector (501) and the light source (401) are arranged in a straight line.

3. The tissue blood oxygen sensor according to claim 2, characterized in that: The number of the photodetectors (501) is greater than or equal to 2, and adjacent photodetectors (501) have the same spacing.

4. The tissue blood oxygen sensor according to claim 1, characterized in that: The light source probe (4) further comprises a light source protection cover (402), and the light source (401) is arranged inside the light source protection cover (402).

5. The tissue blood oxygen sensor according to claim 4, characterized in that: The photoelectric detector probe (5) further comprises a photoelectric detector protective cover (502), and the photoelectric detector (501) is arranged inside the photoelectric detector protective cover (502).

6. The tissue blood oxygen sensor according to claim 5, characterized in that: A wire sheath (301) is provided on the outside of the cable; the light source protection sheath (402) and the photoelectric detector protection sheath (502) are respectively sleeved on the ends of the wire sheath (301).

7. The tissue blood oxygen sensor according to claim 5, characterized in that: The light source protection cover (402), the photoelectric detector protection cover (502) and the probe fixing cover (6) are all made of flexible and light-proof materials.

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