Blood oxygen sensor
By filling the translucent medium in the blood oxygen sensor and using optical devices to improve the light utilization rate, the problem of light intensity in the MRI environment is solved, and high-precision blood oxygen measurement in the magnetic field environment is achieved.
Patent Information
- Application Number
- CN202311872124.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-29
- Publication Date
- 2025-07-01
AI Technical Summary
In the MRI environment, the light intensity of traditional blood oxygen probes leads to reduced measurement accuracy and accuracy, and metal cables and electronic components cannot work properly due to magnetic field interference.
A light-transmitting medium is used to fill the gaps between the light emitting device and the light guide beam, and the optical device is used to improve the light utilization rate, transmit light signals through the first light guide beam and the second light guide beam, avoid magnetic field interference and improve light intensity.
It improves the light intensity of the blood oxygen sensor, improves the measurement accuracy and accuracy of measurement results, and ensures normal operation in an MRI environment.
Smart Images
Figure CN120227018A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of in vitro diagnostic technologies, and particularly to an oxygen saturation sensor. Background Art
[0002] In related technologies, in a traditional oxygen saturation probe, a light emission structure and a light reception structure are arranged in a finger clip structure. After converting an optical signal into an electrical signal, a metal wire is used to transmit the electrical signal. However, in a magnetic resonance imaging (MRI) environment, the metal wire and some electronic components will be interfered by a magnetic field, resulting in the terminal device such as a monitor being unable to read data or unable to accurately read data. For this reason, for some MRI oxygen saturation probes, a light guide beam is used to transmit the measurement light of a light emitting device to a detection site, and another light guide beam receives the measurement light passing through the measurement site and transmits the measurement light to a photosensitive element. The photosensitive element converts the optical signal into an electrical signal, and the oxygen saturation value can be obtained through calculation and analysis by a signal processing unit. However, under the same drive current, the light intensity of an MRI oxygen saturation probe is much weaker than that of a traditional oxygen saturation probe, affecting the measurement accuracy and the accuracy of measurement results. Summary of the Invention
[0003] In view of this, embodiments of this application are expected to provide an oxygen saturation sensor that can improve light intensity and enhance the measurement accuracy and the accuracy of measurement results.
[0004] Embodiments of this application provide an oxygen saturation sensor, including:
[0005] A connector, the connector including a housing, a light emitting device, and a light receiving device; the light emitting device and the light receiving device are both arranged in the housing, the light emitting device is used for emitting a first measurement light, and the light receiving device is used for receiving a second measurement light;
[0006] A clamping mechanism for clamping the detection site;
[0007] A first light guide beam and a second light guide beam connecting the clamping mechanism and the connector; wherein, the light emitting device is connected to the first light guide beam, the light receiving device is connected to the second light guide beam, the first measurement light emitted by the light emitting device is conducted to the clamping mechanism through the first light guide beam, passes through the detection site, and forms a second measurement light after attenuation. The second measurement light is received by the second light guide beam and conducted to the light receiving device through the second light guide beam;
[0008] The light receiving device receives the second measurement light and converts the second measurement light into an electrical signal;
[0009] A light-transmitting medium is filled in the gap between the light-emitting surface of the light-emitting device and the light-incident surface of the first light guide beam, and / or a light-transmitting medium is filled in the gap between the light-incident surface of the light-receiving device and the light-emitting surface of the second light guide beam.
[0010] Wherein, the light-transmitting medium includes at least one of a light-transmitting liquid, a cured glue, and a paste, and the cured glue is a structure obtained by curing a liquid adhesive.
[0011] In the blood oxygen sensor according to the embodiment of the present application, since a light-transmitting medium is filled in the gap between the light-emitting surface of the light-emitting device and the light-incident surface of the first light guide beam, and / or a light-transmitting medium is filled in the gap between the light-incident surface of the light-receiving device and the light-emitting surface of the second light guide beam, thus, the gap between the light-emitting surface of the light-emitting device and the light-incident surface of the first light guide beam is eliminated by the light-transmitting medium, and / or the gap between the light-incident surface of the light-receiving device and the light-emitting surface of the second light guide beam is eliminated by the light-transmitting medium. Therefore, the light intensity loss during the transmission of the measurement light can be reduced, the light intensity of the blood oxygen sensor can be improved to a certain extent, and thus the measurement accuracy and the accuracy of the measurement result can be improved.
[0012] An embodiment of the present application provides a blood oxygen sensor, including:
[0013] A connector, the connector includes a housing, a light-emitting device, and a light-receiving device; the light-emitting device and the light-receiving device are both arranged in the housing, the light-emitting device is used for emitting a first measurement light, and the light-receiving device is used for receiving a second measurement light;
[0014] A clamping mechanism for clamping a detection part;
[0015] A first light guide beam and a second light guide beam connecting the clamping mechanism and the connector; wherein, the light-emitting device is connected to the first light guide beam, the light-receiving device is connected to the second light guide beam, the first measurement light emitted by the light-emitting device is conducted to the clamping mechanism through the first light guide beam, passes through the detection part, and forms a second measurement light after attenuation. The second measurement light is received by the second light guide beam and conducted to the light-receiving device through the second light guide beam;
[0016] The light-receiving device receives the second measurement light and converts the second measurement light into an electrical signal;
[0017] An optical device is arranged on the light-emitting side of the light-emitting device and is used for coupling the first measurement light of the light-emitting device into the first light guide beam.
[0018] In the blood oxygen sensor according to the embodiment of the present application, the optical device is beneficial to improving the light utilization rate of the light emitting device, coupling as much light as possible into the first light guide beam, reducing light loss, and can improve the light intensity of the blood oxygen sensor to a certain extent, thereby improving the measurement accuracy and the accuracy of the measurement result. Description of the Drawings
[0019] Figure 1 Schematic diagram of a blood oxygen sensor according to an embodiment of the present application;
[0020] Figure 2 is Figure 1 Schematic diagram of another perspective of the structure shown;
[0021] Figure 3 is Figure 1 Schematic diagram of the structure of the connector in
[0022] Figure 4 is Figure 3 Explosion schematic diagram of another perspective of the structure shown;
[0023] Figure 5 is a cross-sectional view along the Figure 3 A-A direction in
[0024] Figure 6 Simplified schematic diagram of the mounting structure according to an embodiment of the present application;
[0025] Figure 7 Schematic diagram of the light emitting device and the light receiving device fixed to the mounting structure;
[0026] Figure 8 is Figure 7 Schematic diagram of the inverted structure shown;
[0027] Figure 9 Schematic diagram of the end face of the light guide beam of the comparative example;
[0028] Figure 10 Schematic diagram of the end face of the first light guide beam / second light guide beam according to an embodiment of the present application;
[0029] Figure 11 Schematic diagram of the principle of the optical device according to an embodiment of the present application, where the dotted line indicates the light ray.
[0030] Description of the Reference Numerals
[0031] 10. Connector; 11. First half shell; 12. Second half shell; 13. Interface; 14. Mounting structure; 141. First mounting hole; 142. Second mounting hole; 14a. First hole section; 14b. Second hole section; 14c. Step surface; 14d. Glue receiving groove; 15. Light emitting device; 16. Light receiving device; 171. Optical cone; 172. First spherical lens; 173. Second spherical lens; 21A. First light guiding beam; 21B. Second light guiding beam; 211. Cladding; 212. Core wire; 30. Clamping mechanism. Detailed implementation manners
[0032] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.
[0033] For the various specific technical features described in the specific embodiments, they can be combined in any appropriate manner without conflict. For example, different embodiments and technical solutions can be formed by combining different specific technical features. To avoid unnecessary repetition, various possible combination methods of the various specific technical features in the present invention will not be described separately.
[0034] In the following description, the terms "first / second / ..." involved are only used to distinguish different objects and do not indicate that there are any same or related relationships between the objects. It should be understood that the orientation descriptions "above", "below", "outside", "inside" involved are all the orientations in the normal use state, and the "left" and "right" directions represent the left and right directions shown in the specific corresponding schematic diagrams, which may or may not be the left and right directions in the normal use state.
[0035] It should be noted that the term "comprising", "including" or any other variant thereof is intended to cover a non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including that element. "Plurality" means greater than or equal to two.
[0036] An embodiment of the present application provides a blood oxygen sensor. Please refer to Figure 1 and Figure 2 , and includes a connector 10, a clamping mechanism 30, a first light guiding beam 21A and a second light guiding beam 21B.
[0037] The connector 10 includes a housing, a light emitting device 15, and a light receiving device 16; both the light emitting device 15 and the light receiving device 16 are disposed within the housing.
[0038] Exemplarily, the connector 10 may further include an interface 13. The connector 10 is connected to the plug of the monitor through the interface 13, and electrical signals are transmitted between the blood oxygen sensor and the monitor through the interface 13.
[0039] The light emitting device 15 is used to emit a first measurement light. The composition of the first measurement light is not limited. For example, it may be a mixed light of red light and infrared light. The specific structure of the light emitting device 15 is not limited. For example, it may be an LED light source (Light Emitting Diode).
[0040] The light receiving device 16 is used to receive a second measurement light.
[0041] The clamping mechanism 30 is used to clamp the detection site. The detection site may be a finger, for example. Of course, it may also be other tissues of the human body or an animal.
[0042] The first light guide beam 21A and the second light guide beam 21B connect the clamping mechanism 30 and the connector 10. That is to say, the clamping mechanism 30 and the connector 10 are not directly connected, and the two are physically connected through the first light guide beam 21A and the second light guide beam 21B.
[0043] The first light guide beam 21A and the second light guide beam 21B respectively use a light guiding medium to transmit light rays instead of transmitting electrical signals, so that the influence of the magnetic field on the measurement can be avoided, and this blood oxygen sensor can be used in an MRI environment.
[0044] Among them, the light emitting device 15 is connected to the first light guide beam 21A. Specifically, the two may be directly connected or indirectly connected through other structures.
[0045] The light receiving device 16 is connected to the second light guide beam 21B. Specifically, the two may be directly connected or indirectly connected through other structures.
[0046] The first measurement light emitted by the light emitting device 15 is conducted to the clamping mechanism 30 through the first light guide beam 21A, passes through the detection site, and forms a second measurement light after attenuation. The second measurement light is received by the second light guide beam 21B and conducted to the light receiving device 16 through the second light guide beam 21B.
[0047] Specifically, the end of the first light guide beam 21A away from the light emitting device 15 and the end of the second light guide beam 21B away from the light receiving device 16 are oppositely arranged on the clamping mechanism 30. During detection, the detection site is placed between the end of the first light guide beam 21A and the end of the second light guide beam 21B, so that the first measurement light emitted from the end of the first light guide beam 21A can pass through the detection site and then enter the end of the second light guide beam 21B.
[0048] The light receiving device 16 receives the second measurement light and converts the second measurement light into an electrical signal. That is, the light receiving device 16 realizes photoelectric conversion. Exemplarily, the light receiving device 16 is electrically connected to the interface 13 and is used to transmit the electrical signal to the monitor through the interface 13.
[0049] The gap between the light emitting surface of the light emitting device 15 and the light incident surface of the first light guide beam 21A is filled with a light transmissive medium, and / or the gap between the light incident surface of the light receiving device 16 and the light emitting surface of the second light guide beam 21B is filled with a light transmissive medium.
[0050] Wherein, the light transmissive medium includes at least one of a light transmissive liquid, a cured glue, and a paste. The cured glue is a structure obtained by curing a liquid adhesive. The paste refers to a semi-solid paste-like substance with a soft texture.
[0051] In the related art, in the MRI blood oxygen sensor, since there are air gaps between the light emitting device 15 and the first light guide beam 21A, and between the second light guide beam 21B and the light receiving device 16, when the measurement light is transmitted in the air gap, due to reasons such as interface reflection, the light intensity loss is very large, which is also the main reason for the weak light intensity of the MRI blood oxygen sensor.
[0052] In the embodiment of the present application, since the gap between the light emitting surface of the light emitting device 15 and the light incident surface of the first light guide beam 21A is filled with a light transmissive medium, and / or the gap between the light incident surface of the light receiving device 16 and the light emitting surface of the second light guide beam 21B is filled with a light transmissive medium. Thus, by using the light transmissive medium to eliminate the gap between the light emitting surface of the light emitting device 15 and the light incident surface of the first light guide beam 21A, and / or by using the light transmissive medium to eliminate the gap between the light incident surface of the light receiving device 16 and the light emitting surface of the second light guide beam 21B. Therefore, it is possible to reduce the light intensity loss during the transmission of the measurement light, and to a certain extent, improve the light intensity of the blood oxygen sensor, thereby improving the measurement accuracy and the accuracy of the measurement result.
[0053] Exemplarily, the refractive index of the light transmissive medium between the light emitting surface of the light emitting device 15 and the light incident surface of the first light guide beam 21A is the same as or close to the refractive index of the first light guide beam 21A, which can further effectively reduce the light loss caused by interface reflection and refraction.
[0054] The light-transmitting medium between the light-incident surface of the optical receiver device 16 and the light-emitting surface of the second light guiding beam 21B has a refractive index that is the same as or close to that of the second light guiding beam 21B, which can further effectively reduce the light loss caused by interface reflection and refraction.
[0055] Exemplarily, the connector 10 includes an optical device disposed on the light-emitting side of the light-emitting device 15 for coupling the first measurement light of the light-emitting device 15 into the first light guiding beam 21A. In this way, it is beneficial to improve the light utilization rate of the light-emitting device 15 and couple as much light as possible into the first light guiding beam 21A.
[0056] The specific type of the optical device is not limited.
[0057] The number of optical devices is not limited. For example, it can be one or a lens group composed of multiple lenses.
[0058] Exemplarily, please refer to Figure 5 , the optical device includes a light cone 171. The light cone 171 has a large end and a small end. The end face of the small end faces the light-emitting device 15, and the end face of the large end faces the light-incident surface of the first light guiding beam 21A. It should be noted that the light cone 171 is a solid light cone. Exemplarily, the end faces of the large end and the small end are parallel.
[0059] The light of the light-emitting device 15 has a relatively large emission angle. When the emission angle exceeds a certain angle, for example, exceeds 70°, the light cannot enter the light-incident surface of the first light guiding beam 21A. That is to say, this part of the light cannot enter the first light guiding beam 21A and thus cannot be utilized.
[0060] In this embodiment, the light cone 171 is used to couple the light of the light-emitting device 15, which can make full use of the light and couple as much light as possible from the light-emitting device 15 into the first light guiding beam 21A.
[0061] In other embodiments, please refer to Figure 11 , the optical device includes a first spherical lens 172 and a second spherical lens 173. Among the two refractive surfaces of the first spherical lens 172, one is a plane 172a, which serves as the light-incident surface of the first spherical lens 172, and the other is a spherical surface 172b, which serves as the light-emitting surface of the first spherical lens 172. Among the two refractive surfaces of the second spherical lens 173, one is a spherical surface 173a, which serves as the light-incident surface of the second spherical lens 173, and the other is a plane 173b, which serves as the light-emitting surface of the second spherical lens 173. The spherical surfaces 172b and 173a of the first spherical lens 172 and the second spherical lens 173 face each other. The plane 172a of the first spherical lens 172 faces the light-emitting device 15, and the plane 173b of the second spherical lens 173 faces the light-incident surface of the first light guiding beam 21A.
[0062] Among them, the first spherical lens 172 is used to receive the light of the light emitting device 15 at a large angle and emit light in an approximately parallel beam, and the second spherical lens 173 is used to converge the light of the approximately parallel beam to the light incident surface of the first light guide beam 21A.
[0063] Exemplarily, the gap between the light incident surface of the optical device and the light emitting surface of the light emitting device 15 is filled with a light transmissive medium; thus, the light loss of the path of the light propagating from the light emitting surface of the light emitting device 15 to the optical device can be reduced. And / or, the gap between the light emitting surface of the optical device and the light incident surface of the first light guide beam 21A is filled with a light transmissive medium, so that the light loss of the path of the light propagating from the light emitting surface of the optical device to the light receiving device 16 can be reduced.
[0064] For example, in the embodiment where the optical device is the light cone 171, a light transmissive liquid is filled between the end surface of the large end of the light cone 171 and the light incident surface of the first light guide beam 21A, and / or a light transmissive liquid is filled between the end surface of the small end of the light cone 171 and the light emitting surface of the light emitting device 15.
[0065] For example, in the embodiment where the optical device includes the first spherical lens 172 and the second spherical lens 173, a light transmissive medium can be filled between the light incident surface of the first spherical lens 172 and the light emitting surface of the light emitting device 15. A light transmissive medium can be filled between the light emitting surface of the first spherical lens 172 and the light incident surface of the second spherical lens 173. A light transmissive medium can be filled between the light emitting surface of the second spherical lens 173 and the light incident surface of the first light guide beam 21A.
[0066] Exemplarily, please refer to Figure 4 and Figure 5 , the connector 10 includes a mounting structure 14, please refer to Figures 6 to 8 , the mounting structure 14 has a first mounting hole 141 and a second mounting hole 142. One end of the light emitting device 15 and the first light guide beam 21A are both arranged in the first mounting hole 141, and one end of the light receiving device 16 and the second light guide beam 21B are both arranged in the second mounting hole 142. The light emitting device 15, the light receiving device 16, the first light guide beam 21A and the second light guide beam 21B are mounted and fixed by the mounting structure 14.
[0067] The cross-sectional shape of the first mounting hole 141 is not limited. For example, it can be circular, elliptical, polygonal, etc., and is not limited here.
[0068] The cross-sectional shape of the second mounting hole 142 is not limited. For example, it can be circular, elliptical, polygonal, etc., and is not limited here.
[0069] The cross-sectional shape of the first mounting hole 141 and the cross-sectional shape of the second mounting hole 142 can be the same or different.
[0070] The first mounting hole 141 and / or the second mounting hole 142 is encapsulated with a light-transmitting medium. The first mounting hole 141 /
[0071] The second mounting hole 142 provides a packaging space for the light-transmitting medium, facilitating the perfusion of the light-transmitting medium and also facilitating the sealing of the light-transmitting medium.
[0072] Exemplarily, please refer to Figure 5 , a sealing ring 213 is sleeved on the outer periphery of the part where the first light guide beam 21A is inserted into the first mounting hole 141, and the sealing ring 213 is in sealing contact with the hole wall of the first mounting hole 141. Thus, when the first light guide beam 21A is inserted into the first mounting hole 141, the first mounting hole 141 is at least divided into two spaces by the sealing ring 213. One space is the space between the sealing ring 213 and the light-emitting device 15, and the other space is the space from the sealing ring 213 to the outer surface of the mounting structure 14. On the one hand, it blocks external substances such as impurities and glue from entering between the light-emitting device 15 and the incident light surface of the first light guide beam 21A, preventing contamination of the light-emitting device 15 and the incident light surface of the first light guide beam 21A; on the other hand, the sealing ring 213 can seal the light-transmitting medium in the space between the sealing ring 213 and the light-emitting device 15, reducing the probability of the light-transmitting medium leaking out.
[0073] Exemplarily, a sealing ring 213 is sleeved on the outer periphery of the part where the second light guide beam 21B is inserted into the second mounting hole 142, and the sealing ring 213 is in sealing contact with the hole wall of the second mounting hole 142. Thus, when the second light guide beam 21B is inserted into the second mounting hole 142, the second mounting hole 142 is at least divided into two spaces by the sealing ring 213. One space is the space between the sealing ring 213 and the light-emitting device 15, and the other space is the space from the sealing ring 213 to the outer surface of the mounting structure 14. On the one hand, it blocks external substances such as impurities and glue from entering between the light-emitting device 15 and the incident light surface of the second light guide beam 21B, preventing contamination of the light-emitting device 15 and the incident light surface of the second light guide beam 21B; on the other hand, the sealing ring 213 can seal the light-transmitting medium in the space between the sealing ring 213 and the light-emitting device 15, reducing the probability of the light-transmitting medium leaking out.
[0074] It should be noted that the sealing ring 213 on the first light guide beam 21A and the sealing ring 213 on the second light guide beam 21B may have the same or different shapes; the materials of the two may be the same or different.
[0075] The arrangement of the first mounting hole 141 and the second mounting hole 142 is not limited. For example, in some embodiments, the axes of the first mounting hole 141 and the second mounting hole 142 intersect. In other embodiments, the axes of the first mounting hole 141 and the second mounting hole 142 are arranged as skew lines in space.
[0076] Exemplarily, in some embodiments, the axes of the first mounting hole 141 and the second mounting hole 142 are parallel to each other, and the first light guiding beam 21A and the second light guiding beam 21B are respectively inserted into the first mounting hole 141 and the second mounting hole 142 from the same side of the mounting structure 14. For example, the first light guiding beam 21A is inserted into the first mounting hole 141 from the first side of the mounting structure 14, and the second light guiding beam 21B is also inserted into the second mounting hole 142 from the first side of the mounting structure 14.
[0077] In this embodiment, it is convenient to process the first mounting hole 141 and the second mounting hole 142 on the mounting structure 14, and it is also convenient for the assembly of the first light guiding beam 21A, the second light guiding beam 21B and the mounting structure 14, and the structure is compact.
[0078] Exemplarily, please refer to Figures 6 to 8 , a glue receiving groove 14d is provided on the outer surface of the mounting structure 14 along the first side in the axial direction of the first mounting hole 141. The glue receiving groove 14d communicates with the first mounting hole 141. The first light guiding beam 21A can be inserted into the first mounting hole 141 through the glue receiving groove 14d. The glue receiving groove 14d is filled with an adhesive, and the adhesive is used to bond the first light guiding beam 21A and the mounting structure 14.
[0079] During assembly, please refer to Figure 7 , the light emitting device 15 can be first placed into the first mounting hole 141 from the second side in the axial direction of the first mounting hole 141 and fixed in the first mounting hole 141, and the second end in the axial direction of the first mounting hole 141 needs to be closed. For example, the light emitting device 15 can be fixed in the first mounting hole 141 by glue. In this way, while fixing the light emitting device 15, the second end in the axial direction of the first mounting hole 141 is also closed. Subsequently, please refer to Figure 8 , invert the mounting structure 14, pour a light-transmitting medium into the first mounting hole 141 from the first end in the axial direction of the first mounting hole 141, and then insert one end of the first light guiding beam 21A into the first mounting hole 141 from the first side in the axial direction of the mounting structure 14. The sealing fit between the first light guiding beam 21A and the hole wall of the first mounting hole 141 is realized through a sealing ring. In this way, the light-transmitting medium can be encapsulated in the first mounting hole 141. Thereafter, pour glue into the glue receiving groove 14d. After the glue is cured, the cured glue connects the outer periphery of the first light guiding beam 21A and the mounting structure 14. It can be understood that the sealing ring can also prevent the glue in the glue receiving groove 14d from entering the space between the sealing ring and the light emitting device 15, and at least to a certain extent, it can prevent the glue from contaminating the light emitting device 15 and the light incident surface of the first light guiding beam 21A.
[0080] Please refer to Figures 6 to 8, a glue receiving groove 14d is provided on the outer surface of the mounting structure 14 along the first side in the axial direction of the second mounting hole 142. The glue receiving groove 14d communicates with the second mounting hole 142. The second light guide beam 21B can be inserted into the second mounting hole 142 through the glue receiving groove 14d. The glue receiving groove 14d is filled with an adhesive for bonding the second light guide beam 21B and the mounting structure 14.
[0081] During assembly, please refer to Figure 7 , the light emitting device 15 can be first placed into the second mounting hole 142 from the second side in the axial direction of the second mounting hole 142 and fixed in the second mounting hole 142, and the second end in the axial direction of the second mounting hole 142 needs to be closed. For example, the light emitting device 15 can be fixed in the second mounting hole 142 with glue. In this way, while fixing the light emitting device 15, the second end in the axial direction of the second mounting hole 142 is also closed. Subsequently, please refer to Figure 8 , invert the mounting structure 14, pour a light-transmitting medium into the second mounting hole 142 from the second end in the axial direction of the second mounting hole 142, and then insert one end of the second light guide beam 21B into the second mounting hole 142 from the second side in the axial direction of the mounting structure 14. The sealing cooperation between the second light guide beam 21B and the hole wall of the second mounting hole 142 is realized through a sealing ring. In this way, the light-transmitting medium can be encapsulated in the second mounting hole 142. After that, pour glue into the glue receiving groove 14d. After the glue cures, the cured glue connects the outer periphery of the second light guide beam 21B and the mounting structure 14. It can be understood that the sealing ring can also prevent the glue in the glue receiving groove 14d from entering the space between the sealing ring and the light emitting device 15, and can at least prevent the glue from contaminating the light emitting device 15 and the light incident surface of the second light guide beam 21B to a certain extent.
[0082] In some embodiments, the glue receiving grooves 14d corresponding to the first mounting hole 141 and the glue receiving grooves 14d corresponding to the second mounting hole 142 can be independent of each other. During glue filling, glue is respectively poured into the glue receiving grooves 14d corresponding to the first mounting hole 141 and the glue receiving grooves 14d corresponding to the second mounting hole 142.
[0083] In other embodiments, please refer to Figures 6 to 8 , the glue receiving grooves 14d corresponding to the first mounting hole 141 and the glue receiving grooves 14d corresponding to the second mounting hole 142 communicate with each other. In this way, during assembly, after inserting the first light guide beam 21A into the first mounting hole 141 and inserting the second light guide beam 21B into the second mounting hole 142, then pour glue into one glue melting groove. After the glue cures, the fixing of the first light guide beam 21A and the fixing of the second light guide beam 21B can be realized.
[0084] Exemplarily, please refer to Figure 6 and Figure 8, the first mounting hole 141 and / or the second mounting hole 142 include a first hole section 14a and a second hole section 14b. The cross-sectional area of the first hole section 14a is larger than that of the second hole section 14b. The light-emitting device 15 or the light-receiving device 16 is inserted into the first hole section 14a, and the first light guide beam 21A or the second light guide beam 21B is inserted into the second hole section 14b.
[0085] Specifically, it can be that the first mounting hole 141 adopts the structure of the above-mentioned first hole section 14a and the above-mentioned second hole section 14b. The light-emitting device 15 is inserted into the first hole section 14a of the first mounting hole 141, and the first light guide beam 21A is inserted into the second hole section 14b of the first mounting hole 141. It can also be that the second mounting hole 142 adopts the structure of the above-mentioned first hole section 14a and the above-mentioned second hole section 14b. The light-receiving device 16 is inserted into the first hole section 14a of the second mounting hole 142, and the second light guide beam 21B is inserted into the second hole section 14b of the second mounting hole 142. It can also be that the first mounting hole 141 and the second mounting hole 142 respectively adopt the structure of the above-mentioned first hole section 14a and the above-mentioned second hole section 14b.
[0086] Exemplarily, the mounting structure 14 is made of a light-impermeable material. On the one hand, the light emitted by the light-emitting device 15 will not leak out of the mounting structure 14 to the outside of the mounting structure 14. In addition, the light emitted by the light-emitting device 15 will not cross from the first mounting hole 141 to the second mounting hole 142 and cause interference to the light-receiving device 16. In addition, the light emitted from the light-emitting surface of the second light guide beam 21B will not cross to the first mounting hole 141.
[0087] The material of the mounting structure 14 is not limited. For example, it can be metal, plastic, ceramic, etc.
[0088] In some embodiments, the mounting structure 14 is made of light-impermeable plastic.
[0089] In some embodiments, the mounting structure 14 is an integral component. For example, an integral plastic part, or an integral metal part, or an integral ceramic part, etc. In this way, the structure is simple, the assembly time is saved, and the mounting structure 14 also has good structural strength.
[0090] In some other embodiments, the mounting structure 14 can also be assembled from individual parts.
[0091] Exemplarily, please refer to Figure 4 , the connector 10 includes a first half-shell 11 and a second half-shell 12. The first half-shell 11 and the second half-shell 12 are docked, so that it is convenient for assembly.
[0092] Exemplarily, the first half-shell 11 and the second half-shell 12 fix the mounting structure 14 therebetween. Thus, when the first half-shell 11 and the second half-shell 12 are docked, the mounting structure 14 can be fixed therebetween by the clamping of the two, and there is no need to use other connecting parts for connection, saving the assembly time.
[0093] Of course, in other embodiments, the mounting structure 14 can also be fixed to the housing by connecting parts such as screws and snaps.
[0094] Exemplarily, please refer to Figure 10 , the first light guide beam 21A and / or the second light guide beam 21B include a cladding 211 and a plurality of core filaments 212. Light is totally reflected and propagated in the core filaments 212, and each core filament 212 is accommodated inside the cladding 211. The cladding 211 is the outer shell of the light guide beam and plays a protective role for the core filaments 212.
[0095] One end of the light guide beam close to the connector 10 contracts radially inward to form a contraction structure, and the end face of the contraction structure faces the light receiving device 16 or the light emitting device 15. Alternatively, in the end face of one end of the light guide beam close to the connector 10, the cladding 211 radially inwardly presses the core filaments 212 so that the end face shapes of at least some of the core filaments 212 are non-circular (refer to Figure 10 ).
[0096] It should be noted that the cross-sectional dimensions at various positions in the length direction of the core filaments 212 are basically unchanged.
[0097] It should be noted that the parts where the first light guide beam 21A and the second light guide beam 21B are respectively connected to the mounting structure 14 have light guide beam joints. At the positions of the light guide beam joints, there are no such claddings 211 and core filaments 212. Therefore, the above-mentioned contraction structure or the part where the cladding 211 radially inwardly presses the core filaments 212 is located at the end face of the core filaments 212 facing the light guide beam joint.
[0098] In the embodiment where one end of the light guide beam close to the connector 10 contracts radially inward to form a contraction structure, compared with the cross-section of the cladding 211 at other parts outside the contraction structure, the cross-sectional area of the cladding 211 at the contraction structure is smaller. Thus, the space for the cladding 211 to accommodate the core filaments 212 is smaller, making the distribution of the core filaments 212 denser at the contraction structure, and the gap between two adjacent core filaments 212 is smaller. That is, more core filaments can be accommodated with the same cross-sectional area. Therefore, more light can enter the core filaments 212, and less light enters the gap between the core filaments 212 (the light entering the gap between the core filaments 212 cannot be utilized and is regarded as light loss). The higher the number of core filaments filled in the light guide beam with the same outer diameter, the higher the light transmittance. Therefore, the light loss at the light incident surface of the light guide beam can be effectively reduced.
[0099] Similarly, in an embodiment where the cladding 211 radially inwardly presses the core filaments 212 such that at least a part of the end face shape of the core filaments 212 is non-circular, after the cladding 211 radially inwardly presses the core filaments 212, a contraction structure is formed at one end of the light guiding beam close to the connector 10. The pressing operation causes the cross-sectional shape of the core filaments 212 to change from circular to non-circular, such as, for example, a polygon, etc. Thus, the core filaments 212 can be arranged more densely, and the gap between two adjacent core filaments 212 is smaller, that is, more core filaments can be accommodated in the same cross-sectional area. Therefore, more light can enter the core filaments 212, and less light enters the gap between the core filaments 212 (the light entering the gap between the core filaments 212 cannot be utilized and is regarded as light loss). The higher the number of core filaments filled in the light guiding beam with the same outer diameter, the higher the light transmittance. Therefore, the light loss of the light incident surface of the light guiding beam can be effectively reduced.
[0100] For example, please refer to Figure 9 and Figure 10 , it can be seen that under the same cross-sectional area of the cladding, more core filaments 212 can be accommodated in the cladding 211 in the embodiment of the present application.
[0101] Exemplarily, during the processing, after gathering a plurality of core filaments into a bundle, heating and pressing operations are performed on the circumference of the end face of the light guiding beam. Heating softens the core filaments, and pressing reduces the gap between the core filaments. For a schematic diagram of the end face of the formed core filaments, please refer to Figure 10 , compared with the light guiding beam before improvement ( Figure 9 shown), the gap between the pressed core filaments is very small, and the core filaments are denser.
[0102] An embodiment of the present application provides a blood oxygen sensor, including a connector 10, a clamping mechanism 30, a first light guiding beam 21A, and a second light guiding beam 21B.
[0103] The connector 10 includes a housing, a light emitting device 15, and a light receiving device 16; both the light emitting device 15 and the light receiving device 16 are disposed in the housing. Exemplarily, the connector 10 may further include an interface 13, and the connector 10 is connected to the plug of the monitor through the interface 13.
[0104] The light emitting device 15 is used for emitting a first measurement light. The composition of the first measurement light is not limited. For example, it may be a mixed light of red light and infrared light. The specific structure of the light emitting device 15 is not limited. For example, it may be an LED light source (Light Emitting Diode).
[0105] The light receiving device 16 is used for receiving a second measurement light.
[0106] The clamping mechanism 30 is used to clamp the detection site. The detection site can be, for example, a finger. Of course, it can also be other tissues of the human body or animals.
[0107] The first light guide beam 21A and the second light guide beam 21B connect the clamping mechanism 30 and the connector 10. That is to say, the clamping mechanism 30 and the connector 10 are not directly connected, and the two are physically connected through the first light guide beam 21A and the second light guide beam 21B.
[0108] The first light guide beam 21A and the second light guide beam 21B respectively use an optical guiding medium to transmit light rays instead of electrical signals, so the influence of the magnetic field on the measurement can be avoided, and this blood oxygen sensor can be used in an MRI environment.
[0109] Among them, the light emitting device 15 is connected to the first light guide beam 21A. Specifically, the two can be directly connected or indirectly connected through other structures.
[0110] The light receiving device 16 is connected to the second light guide beam 21B. Specifically, the two can be directly connected or indirectly connected through other structures.
[0111] The first measurement light emitted by the light emitting device 15 is conducted to the clamping mechanism 30 through the first light guide beam 21A, passes through the detection site, and forms the second measurement light after attenuation. The second measurement light is received by the second light guide beam 21B and conducted to the light receiving device 16 through the second light guide beam 21B.
[0112] Specifically, the end of the first light guide beam 21A far from the light emitting device 15 and the end of the second light guide beam 21B far from the light receiving device 16 are oppositely arranged on the clamping mechanism 30. During detection, the detection site is placed between the end of the first light guide beam 21A and the end of the second light guide beam 21B, so that the first measurement light emitted from the end of the first light guide beam 21A can pass through the detection site and then be incident on the end of the second light guide beam 21B.
[0113] The light receiving device 16 receives the second measurement light and converts the second measurement light into an electrical signal. That is, the light receiving device 16 realizes photoelectric conversion.
[0114] The connector 10 further includes an optical device. The optical device is arranged on the light emitting side of the light emitting device 15 and is used to couple the first measurement light of the light emitting device 15 into the first light guide beam 21A. In this way, it is beneficial to improve the light utilization rate of the light emitting device 15, couple as much light as possible into the first light guide beam 21A, reduce light loss, and can improve the light intensity of the blood oxygen sensor to a certain extent, thereby improving the measurement accuracy and the accuracy of the measurement result.
[0115] Exemplarily, an antireflection film is provided on the light emitting surface and / or the light incident surface of the optical device.
[0116] The antireflection film can reduce the light reflection phenomenon at the end face of the optical device, enabling more light to transmit through the end face, which is beneficial to improving the light utilization rate of the light emitting device 15 and coupling as much light as possible into the first light guiding beam 21A.
[0117] The specific type of the optical device is not limited.
[0118] The number of optical devices is not limited. For example, it can be a single lens or a lens group composed of multiple lenses.
[0119] Exemplarily, the optical device includes an optical cone 171. The optical cone 171 has a large end and a small end. The end face of the small end faces the light emitting device 15, and the end face of the large end faces the incident light surface of the first light guiding beam 21A. The antireflection film is provided on the end face of the large end and / or the end face of the small end.
[0120] It should be noted that the optical cone 171 is a solid optical cone 171. Exemplarily, the end faces of the large end and the small end are parallel.
[0121] The light emitted by the light emitting device 15 has a relatively large emission angle. When the emission angle exceeds a certain angle, for example, exceeds 70°, the light cannot enter the incident light surface of the first light guiding beam 21A. That is to say, this part of the light cannot enter the first light guiding beam 21A and thus cannot be utilized.
[0122] In this embodiment, the optical cone 171 is used to couple the light emitted by the light emitting device 15, which can make full use of the light and couple the light emitted by the light emitting device 15 into the first light guiding beam 21A as much as possible.
[0123] In other embodiments, please refer to Figure 11 , the optical device includes a first spherical lens 172 and a second spherical lens 173. Among the two refracting surfaces of the first spherical lens 172, one surface is a plane 172a, serving as the incident light surface of the first spherical lens 172, and the other surface is a spherical surface 172b, serving as the outgoing light surface of the first spherical lens 172. Among the two refracting surfaces of the second spherical lens 173, one surface is a spherical surface 173a, serving as the incident light surface of the second spherical lens 173, and the other surface is a plane 173b, serving as the outgoing light surface of the second spherical lens 173. The spherical surfaces 172b and 173a of the first spherical lens 172 and the second spherical lens 173 face each other. The plane 172a of the first spherical lens 172 faces the light emitting device 15, and the plane 173b of the second spherical lens 173 faces the incident light surface of the first light guiding beam 21A.
[0124] Among them, the first spherical lens 172 is used to receive the light of the light emitting device 15 at a large angle and emit light in an approximately parallel beam, and the second spherical lens 173 is used to converge the light of the approximately parallel beam to the light incident surface of the first light guiding beam 21A.
[0125] An anti-reflection film is provided on at least one of the plane and the spherical surface of the first spherical lens 172 and the plane and the spherical surface of the second spherical lens 173.
[0126] That is to say, an anti-reflection film can be provided on the light incident surface and / or the light emitting surface of the first spherical lens 172.
[0127] An anti-reflection film can be provided on the light incident surface and / or the light emitting surface of the second spherical lens 173.
[0128] For other structures of the blood oxygen sensor according to the embodiments of the present application, reference can be made to the structures of the blood oxygen sensors in any of the above embodiments, which will not be elaborated herein.
[0129] In the description of the present application, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the present application, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine the different embodiments or examples described in the present application and the features of the different embodiments or examples.
[0130] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A blood oxygen sensor, characterized in that, Comprising: A connector, which includes a housing, an optical transmitting device, and an optical receiving device; Both the optical transmitting device and the optical receiving device are arranged in the housing. The optical transmitting device is used to emit a first measurement light, and the optical receiving device is used to receive a second measurement light; A clamping mechanism for clamping a detection part; A first light guiding beam and a second light guiding beam, connecting the clamping mechanism and the connector; wherein, the optical transmitting device is connected to the first light guiding beam, the optical receiving device is connected to the second light guiding beam, the first measurement light emitted by the optical transmitting device is conducted to the clamping mechanism through the first light guiding beam, passes through the detection part, and forms a second measurement light after attenuation. The second measurement light is received by the second light guiding beam and conducted to the optical receiving device through the second light guiding beam; The optical receiving device receives the second measurement light and converts the second measurement light into an electrical signal; The gap between the light emitting surface of the optical transmitting device and the light incident surface of the first light guiding beam is filled with a light transmissive medium, and / or, the gap between the light incident surface of the optical receiving device and the light emitting surface of the second light guiding beam is filled with a light transmissive medium, wherein, the light transmissive medium includes at least one of a light transmissive liquid, a cured glue, and a paste, and the cured glue is a structure obtained by curing a liquid adhesive.
2. The blood oxygen sensor according to claim 1, characterized in that The connector includes an optical component, which is arranged on the light emitting side of the optical transmitting device and is used to couple the light of the optical transmitting device into the first light guiding beam; The gap between the light incident surface of the optical component and the light emitting surface of the optical transmitting device is filled with the light transmissive medium; and / or, the gap between the light emitting surface of the optical component and the light incident surface of the first light guiding beam is filled with the light transmissive medium.
3. The blood oxygen sensor according to claim 2, wherein The optical component includes a light cone, the light cone has a large end and a small end, the end surface of the small end faces the optical transmitting device, and the end surface of the large end faces the light incident surface of the first light guiding beam; or, the optical component includes a first spherical lens and a second spherical lens. The first spherical lens and the second spherical lens respectively include a plane and a spherical surface. The planes of the first spherical lens and the second spherical lens face each other, the spherical surface of the first spherical lens faces the optical transmitting device, and the spherical surface of the second spherical lens faces the light incident surface of the first light guiding beam.
4. The blood oxygen sensor according to claim 1, characterized in that, The connector includes a mounting structure, The mounting structure has a first mounting hole and a second mounting hole. One end of both the optical transmitting device and the first light guiding beam is arranged in the first mounting hole, and one end of both the optical receiving device and the second light guiding beam is arranged in the second mounting hole; The first mounting hole and / or the second mounting hole is encapsulated with the light transmissive medium.
5. The blood oxygen sensor according to claim 4, wherein, A sealing ring is sleeved on the outer periphery of the part of the first light guiding beam inserted into the first mounting hole, and the sealing ring is in sealing contact with the hole wall of the first mounting hole; and / or, a sealing ring is sleeved on the outer periphery of the part of the second light guiding beam inserted into the second mounting hole, and the sealing ring is in sealing contact with the hole wall of the second mounting hole.
6. The blood oxygen sensor according to claim 4, wherein, The axes of the first mounting hole and the second mounting hole are parallel to each other, and the first light guide beam and the second light guide beam are respectively inserted into the first mounting hole and the second mounting hole from the same side of the mounting structure.
7. The blood oxygen sensor according to claim 4, wherein a glue receiving groove is provided on the outer surface of the mounting structure along the first side in the axial direction of the first mounting hole, the glue receiving groove communicates with the first mounting hole, the first light guide beam can be inserted into the first mounting hole through the glue receiving groove, the glue receiving groove is filled with an adhesive, and the adhesive is used for bonding the first light guide beam and the mounting structure; and / or, a glue receiving groove is provided on the outer surface of the mounting structure along the first side in the axial direction of the second mounting hole, the glue receiving groove communicates with the second mounting hole, the second light guide beam can be inserted into the second mounting hole through the glue receiving groove, the glue receiving groove is filled with an adhesive, and the adhesive is used for bonding the second light guide beam and the mounting structure.
8. The blood oxygen sensor according to claim 7, wherein The glue receiving groove corresponding to the first mounting hole and the glue receiving groove corresponding to the second mounting hole communicate with each other.
9. The blood oxygen sensor according to claim 4, wherein The first mounting hole and / or the second mounting hole includes a first hole section and a second hole section, the cross-sectional area of the first hole section is larger than that of the second hole section, the light emitting device or the light receiving device is inserted into the first hole section, and the first light guide beam or the second light guide beam is inserted into the second hole section.
10. The blood oxygen sensor according to any one of claims 4-9, characterized in that, The mounting structure is made of a light-impermeable material.
11. The blood oxygen sensor according to any one of claims 4-9, characterized in that, The mounting structure is an integral member.
12. The blood oxygen sensor according to any one of claims 4-9, characterized in that, The connector includes a first half shell and a second half shell, the first half shell and the second half shell are butted, and the mounting structure is fixed between the two.
13. The blood oxygen sensor according to any one of claims 1 to 12, characterized in that, The first light guide beam and / or the second light guide beam includes a cladding and a plurality of core filaments, each core filament is disposed inside the cladding, one end of the light guide beam close to the connector contracts radially inward to form a contraction structure, and the end face of the contraction structure faces the light receiving device or the light emitting device; or, the first light guide beam and / or the second light guide beam includes a cladding and a plurality of core filaments, each core filament is disposed inside the cladding, in the end face of one end of the light guide beam close to the connector, the cladding squeezes the core filaments radially inward so that the end face shapes of at least some of the core filaments are non-circular.
14. A blood oxygen sensor, characterized in that, Comprising: a connector, the connector including a housing, a light emitting device, and a light receiving device; the light emitting device and the light receiving device are both disposed inside the housing, the light emitting device is used for emitting a first measurement light, and the light receiving device is used for receiving a second measurement light; a clamping mechanism for clamping a detection site; A first light guiding beam and a second light guiding beam connect the clamping mechanism and the connector; wherein, the light emitting device is connected to the first light guiding beam, the light receiving device is connected to the second light guiding beam, the first measurement light emitted by the light emitting device is conducted to the clamping mechanism via the first light guiding beam, passes through the detection part, and forms second measurement light after attenuation. The second measurement light is received by the second light guiding beam and conducted to the light receiving device via the second light guiding beam; The light receiving device receives the second measurement light and converts the second measurement light into an electrical signal; An optical device is arranged on the light emitting side of the light emitting device and is used for coupling the first measurement light of the light emitting device into the first light guiding beam.
15. The blood oxygen sensor according to claim 14, wherein An antireflection film is arranged on the light emitting surface and / or the light incident surface of the optical device.
16. The blood oxygen sensor according to claim 15, wherein, The optical device includes a light cone, the light cone has a large end and a small end, the end face of the small end faces the light emitting device, the end face of the large end faces the light incident surface of the first light guiding beam, and the antireflection film is arranged on the end face of the large end and / or the end face of the small end.
17. The blood oxygen sensor according to claim 15, wherein The optical device includes a first spherical lens and a second spherical lens. The first spherical lens and the second spherical lens respectively include a plane and a spherical surface. The planes of the first spherical lens and the second spherical lens face each other. The spherical surface of the first spherical lens faces the light emitting device, and the spherical surface of the second spherical lens faces the light incident surface of the first light guiding beam; The antireflection film is arranged on at least one of the plane and the spherical surface of the first spherical lens and the plane and the spherical surface of the second spherical lens.