Magnetic resonance blood oxygen sensor

Abstract

This invention provides an MR pulse oximeter sensor, including a plug assembly, a fixing assembly, and an optical fiber assembly. The plug assembly includes a metal plug, an inner mold, a housing, a welding wire, a receiving tube, a light-emitting tube, and a light cone. One end of the welding wire is connected to the metal plug, and the other end is connected to the receiving tube or the receiving tube. The metal plug is fixed to the inner mold. The light cone is positioned at the light-emitting tube and used to focus the light emitted by the tube. The housing is fitted onto the inner mold, and the receiving tube, light-emitting tube, welding wire, and light cone are housed within the housing. The light-emitting tube includes an LED. The fixing assembly includes a first fixing frame and a clamping member. The clamping member is used to clamp a human body part, and the first fixing frame is embedded within the clamping member. The optical fiber assembly is used to transmit optical fiber signals between the fixing assembly and the plug assembly. Implementing the MR pulse oximeter sensor of this invention allows the use of LEDs instead of round-headed LED beads without reducing measurement accuracy.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, and in particular to an MR blood oxygen sensor. Background Technology

[0002] Blood oxygen sensors are based on the photoplethysmography (PPG) method. They emit 660nm red light and 940nm infrared light to penetrate tissue (such as fingers or earlobes) and detect the difference in absorption of oxyhemoglobin (HbO2) and deoxyhemoglobin (Hb) to different wavelengths of light, calculating blood oxygen saturation (SpO2) and pulse rate. The MRI environment refers to the specific three-dimensional spatial region around magnetic resonance imaging equipment affected by strong magnetic fields, radio frequency fields, and gradient fields. Its safety boundary is defined by the magnetic field strength (such as a 5 Gauss or 9 Gauss line), and must be strictly controlled to prevent the risk of ferromagnetic object projection, equipment interference, and personnel injury. Blood oxygen sensors used in MRI environments are called MR blood oxygen sensors.

[0003] Conventional pulse oximeters use LED sensors, but most commercially available MR pulse oximeters use round-head LEDs. One reason is that fiber optic transmission suffers signal loss, and round-head LEDs increase signal strength for more accurate measurements. Another reason is that conventional structures and manufacturing processes cannot reliably connect the fiber optic cable and other components. Using lower-power LEDs would result in significant signal loss during transmission, making accurate pulse oximetry calculations impossible. Round-head LEDs offer stronger light intensity, compensating for losses caused by fiber optic transmission and connections, but this approach is more expensive. While round-head LEDs offer higher power, they also result in higher energy consumption and shorter lifespans. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides an MR blood oxygen sensor that uses LEDs instead of round-headed LED beads without reducing measurement accuracy.

[0005] Therefore, one embodiment provides an MR blood oxygen sensor, comprising:

[0006] A plug assembly includes a metal plug, an inner mold, a outer shell, a welding wire, a receiving tube, a light-emitting tube, and a light cone; one end of the welding wire is connected to the metal plug, and the other end is connected to the light-emitting tube or the receiving tube; the metal plug is fixed to the inner mold; the light cone is disposed at the light-emitting tube and is used to focus the light emitted by the light-emitting tube and guide it into the optical fiber assembly; the outer shell is fitted onto the inner mold, and the receiving tube, the light-emitting tube, the welding wire, and the light cone are housed within the outer shell; the light-emitting tube includes an LED light.

[0007] A fixing component, comprising a first fixing frame and a clamping member, the clamping member being used to clamp a human body part, the first fixing frame being embedded within the clamping member;

[0008] An optical fiber assembly for transmitting optical fiber signals between the fixing assembly and the plug assembly.

[0009] As a further optional embodiment of the MR blood oxygen sensor, the plug assembly also includes a second fixing bracket, which is disposed within the housing and used to fix the light-emitting tube and the receiving tube.

[0010] As a further alternative to the MR blood oxygen sensor, the second mounting bracket is fixed to the light-emitting tube and the receiving tube by adhesive filling.

[0011] As a further alternative to the MR blood oxygen sensor, the welding wire and the housing are fixed together by adhesive filler.

[0012] As a further alternative to the MR blood oxygen sensor, the welding line has a shielding layer for shielding against external interference.

[0013] As a further alternative to the MR blood oxygen sensor, the light cone has a large end and a small end, and the light emitted by the light-emitting tube is guided into the optical fiber assembly after passing through the large end and the small end in sequence.

[0014] As a further alternative to the MR blood oxygen sensor, the fixation assembly also includes a strap, one end of which is connected to the clamp.

[0015] As a further alternative to the MR blood oxygen sensor, the metal plug is a non-magnetic plug.

[0016] As a further optional embodiment of the MR blood oxygen sensor, the optical fiber assembly includes a near-light connector, a far-light connector, and two optical fibers; each of the optical fibers is connected to a near-light connector and a far-light connector at both ends, the near-light connector being used to connect to the light-emitting tube or the receiving tube, and the far-light connector being used to insert into the first fixing frame.

[0017] As a further alternative to the MR blood oxygen sensor, the optical fiber assembly also includes a sheath sleeve, which is fitted onto the optical fiber.

[0018] Implementing the embodiments of this utility model will have the following beneficial effects:

[0019] According to the MR pulse oximeter sensor in the above embodiments, the clamping component of the fixation assembly is held in place by the patient. The fiber optic assembly connects the fixation assembly and the plug assembly for signal transmission, and the plug assembly is inserted into the monitoring device. In the plug assembly, the light-emitting diode is an LED lamp. The light is amplified by the focusing effect of the light cone, ensuring that the light intensity emitted by the LED lamp after entering the fiber optic assembly is no less than that of a round-headed LED. After entering the fiber optic assembly, the light shines on the human body through the clamping component, and after reflection, it passes through the clamping component, the fiber optic assembly, and the receiving tube. The receiving tube converts the light signal into an electrical signal, which is then transmitted to the metal plug via a soldering wire. The electrical signal from the metal plug is ultimately read by the monitoring device. Implementing the MR pulse oximeter sensor of this invention allows the use of LED lamps instead of round-headed LEDs without reducing measurement accuracy. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] in:

[0022] Figure 1 A schematic diagram of the overall structure of the MR pulse oximeter sensor provided according to an embodiment of the present invention is shown;

[0023] Figure 2 This diagram shows the overall structure of an MR pulse oximeter sensor with part of its outer casing removed, according to an embodiment of the present invention.

[0024] Figure 3 A cross-sectional schematic diagram of the plug assembly and optical fiber assembly after assembly according to an embodiment of the present invention is shown;

[0025] Figure 4 A cross-sectional schematic diagram of the assembled fixing component and optical fiber component according to an embodiment of the present invention is shown;

[0026] Figure 5 An exploded view of the plug assembly and optical fiber assembly provided according to an embodiment of the present invention is shown.

[0027] Figure 6 This diagram illustrates a structural schematic of a high beam connector and fixing assembly according to an embodiment of the present invention.

[0028] Figure 7This diagram illustrates another structural schematic of a high beam connector and fixing assembly provided according to an embodiment of the present invention.

[0029] Explanation of key component symbols:

[0030] Plug assembly - 10; Metal plug - 110; Inner mold - 120; Outer shell - 130; Welding wire - 140; Receiving tube - 150; Light-emitting tube - 160; Light cone - 170; Second fixing bracket - 180;

[0031] Fixing component-20; First fixing frame-210; Clamping component-220; Strap-230;

[0032] Fiber optic assembly - 30; Near-beam connector - 310; Far-beam connector - 320; Fiber optic cable - 330; Cable sheath - 340. Detailed Implementation

[0033] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0034] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0036] This utility model provides an MR blood oxygen sensor, please refer to... Figures 1-7The MR pulse oximeter sensor includes a plug assembly 10, a fixing assembly 20, and an optical fiber assembly 30. The plug assembly 10 includes a metal plug 110, an inner mold 120, a housing 130, a welding wire 140, a receiving tube 150, a light-emitting tube 160, and a light cone 170. One end of the welding wire 140 is connected to the metal plug 110, and the other end is connected to the light-emitting tube 160 or the receiving tube 150. The metal plug 110 is fixed to the inner mold 120. The light cone 170 is located at the light-emitting tube 160 and is used to focus the light emitted by the light-emitting tube 160 and guide it into the optical fiber assembly 30. The housing 130 is fitted inside the inner mold 120, and the receiving tube 150, the light-emitting tube 160, the welding wire 140, and the light cone 170 are housed within the housing 130. The light-emitting tube 160 includes an LED light. The fixing component 20 includes a first fixing frame and a clamping member 220. The clamping member 220 is used to clamp a human body part, and the first fixing frame 210 is embedded in the clamping member 220. The optical fiber assembly 30 is used to transmit optical fiber signals between the fixing component 20 and the plug assembly 10.

[0037] According to the MR pulse oximeter sensor in the above embodiments, the clamping member 220 of the fixing component 20 is clamped to the patient. The fiber optic component 30 connects the fixing component 20 and the plug component 10 for signal transmission. The plug component 10 is inserted into the monitoring device. In the plug component 10, the light-emitting tube 160 is an LED lamp. The light-concentrating effect of the light cone 170 enhances the light signal, so that the light intensity emitted by the LED lamp after entering the fiber optic component 30 is not weaker than that of a round-headed LED. After entering the fiber optic component 30, the light shines on the human body through the clamping member 220, and after reflection, it passes through the clamping member 220, the fiber optic component 30, and the receiving tube 150. The receiving tube 150 converts the light signal into an electrical signal and transmits it to the metal plug 110 via the welding wire 140. The electrical signal of the metal plug 110 is finally read by the monitoring device. Implementing the MR pulse oximeter sensor of this utility model can achieve the purpose of using an LED lamp instead of a round-headed LED lamp without reducing the measurement accuracy.

[0038] LED lights need to be able to emit red and infrared light. The fiber optic assembly 30 is connected to the first mounting bracket 210, which allows the fiber optic assembly 30 and the mounting component 20 to be detached. The mounting component 20 can also be replaced, cleaned, disinfected, etc.

[0039] In some specific embodiments, please refer to Figure 3 and Figure 5 The plug assembly 10 also includes a second fixing bracket 180, which is disposed inside the housing 130 and is used to fix the light-emitting tube 160 and the receiving tube 150.

[0040] Typically, there are two welding wires 140. One welding wire 140 is connected at one end to the metal plug 110 and at the other end to the light-emitting tube 160. The other welding wire 140 is connected at one end to the metal plug 110 and at the other end to the receiving tube 150. After the welding wires 140 are connected, the light-emitting tube 160 and the receiving tube 150 are installed in the mounting slots of the second mounting bracket 180, and the light cone 170 is also installed in the corresponding mounting slot of the light-emitting tube 160.

[0041] Next, the second fixing bracket 180 and the inner mold 120 are sequentially inserted into the outer shell 130 to encapsulate the plug assembly 10. Typically, the inner mold 120 is injection molded to ensure that the inner cavity of the outer shell 130 is isolated from the outside, achieving the purpose of waterproofing and dustproofing.

[0042] In some specific embodiments, the second mounting bracket 180 is fixed to the light-emitting tube 160 and the receiving tube 150 by adhesive filling.

[0043] The gap between the second fixing bracket 180 and the light-emitting tube 160 and the receiving tube 150 is filled with adhesive to fix them, thereby achieving a seal for the light-emitting tube 160 and the receiving tube 150. This not only improves the waterproof and dustproof capabilities, but also serves as a light shield, preventing the light emitted by the light-emitting tube 160 from leaking out, thus increasing the light intensity.

[0044] The optical cone 170 is roughly trumpet-shaped, with a large end and a small end. The large end is near the light-emitting diode 160, and the small end is near the optical fiber 330. The diameter of the large end is larger than that of the small end, thus forming a tapered structure that gradually tapers from the large end to the small end. The light emitted by the light-emitting diode 160, acting as the light source, first illuminates the large end of the optical cone 170. The light then undergoes a series of reflections and refractions within the optical cone 170, gradually converging and propagating along the axial direction of the optical cone towards the small end. Finally, the light exits from the small end and is precisely guided into the optical fiber assembly 30 to achieve efficient optical signal transmission. This structural design of the optical cone 170 effectively improves the coupling efficiency of the light, reduces energy loss during transmission, and ensures that the light can enter the optical fiber assembly 30 stably and efficiently, thereby enhancing the performance of the entire optical system.

[0045] In some specific embodiments, the welding line 140 and the housing 130 are fixed together by adhesive filler.

[0046] In this embodiment, the welding line 140 and the outer casing 130 are also fixed with glue, thereby fixing the welding line 140 and protecting the solder joint.

[0047] The adhesives used here are generally hot melt adhesives. Hot melt adhesives are a type of plastic adhesive whose physical state changes with temperature within a certain temperature range, while its chemical properties remain unchanged. They are non-toxic, odorless, and considered environmentally friendly chemical products. There are many types of hot melt adhesives. According to their material composition, they can be divided into polyethylene, polyamide, polyester, etc., and according to their physical form, they can be divided into granular, powder, and block forms.

[0048] In some specific embodiments, the welding line 140 has a shielding layer (not shown) for shielding against external interference.

[0049] The primary purpose of the shielding layer is to shield against electromagnetic interference. In an MRI environment, electromagnetic fields, radio frequency fields, and gradient fields can interfere with the electrical signal transmission of the bonding wire 140; therefore, the shielding wire can serve to shield against this interference.

[0050] When electromagnetic waves encounter a shielding layer made of conductive or magnetic materials, they are reflected on the surface of the shielding layer. At the same time, some of the electromagnetic wave energy is absorbed by the shielding layer and converted into other forms of energy such as heat, thereby weakening the electromagnetic wave energy and reducing interference.

[0051] Electromagnetic waves may induce eddy currents on the shielding layer, which in turn generate a reverse electromagnetic field on the shielding layer. This field cancels out some of the energy of the interfering electromagnetic waves, thus reducing electromagnetic interference.

[0052] In some specific embodiments, the clamping member 220 is at least partially made of silicone.

[0053] In the structural design of the pulse oximeter, the clamping component 220 is a key component, and at least some areas of it are made of high-quality silicone material. This silicone material undergoes a special formulation and processing, resulting in superior flexibility and biocompatibility. It not only conforms closely to the human skin, ensuring stability and accuracy during monitoring, but also effectively reduces user discomfort. Furthermore, this silicone material has good aging and corrosion resistance, extending the service life of the clamping component 220 and ensuring the long-term stable operation of the pulse oximeter. During the manufacturing process of the clamping component 220, the silicone material achieves good adhesion and fit with other components or structures, thereby optimizing the overall assembly process and performance.

[0054] In some specific embodiments, please refer to Figure 6 The fixing component 20 also includes a strap 230, one end of which is connected to the clamp 220.

[0055] The purpose of strap 230 is to facilitate clamping the patient at different locations. Please refer to... Figure 1 , Figure 6 and Figure 7Different types of clamping parts 220 can be used in different environments. The clamping parts are usually clamped on the patient's fingers, some are fixed with straps 230, and some are relatively fixed with the elasticity of torsion springs.

[0056] In some specific embodiments, the metal plug 110 is a non-magnetic plug.

[0057] When current flows through a coil, it generates magnetic field lines. If these magnetic field lines are placed inside another coil, they will induce eddy currents in the conductor, leading to magnetic field distortion. Non-magnetic plugs minimize their own influence on magnetic fields and the interference of magnetic fields on themselves by using materials that are not easily affected by magnetic fields and through a special structural design, thereby ensuring the accuracy of signal transmission and the stability of equipment operation.

[0058] In some specific embodiments, the optical fiber assembly 30 includes a near-light connector 310, a far-light connector 320, and two optical fibers 330; each optical fiber 330 is connected to a near-light connector 310 and a far-light connector 320 at both ends. The near-light connector 310 is used to connect to the light-emitting tube 160 or the receiving tube 150, and the far-light connector 320 is used to insert into the first fixing frame 210.

[0059] In this embodiment, the light-emitting diode 160 emits light, which enters the optical fiber 330 through its near-light end, then is guided into the clamping member 220 through the far-light connector 320, and finally illuminates the human body. After being reflected by the human body, the light is guided back into the optical fiber 330 through its far-light end, and then through its near-light end into the receiving diode 150. The receiving diode 150 converts the optical signal into an electrical signal, which is then transmitted to the monitoring device via the welding wire 140 and the metal plug 110.

[0060] In some specific embodiments, the optical fiber assembly 30 further includes a sheath 340, which is fitted onto the optical fiber 330.

[0061] The cable sheath 340 is mainly used to protect the optical fiber 330 and bind the two optical fibers 330 together.

[0062] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0063] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An MR blood oxygen sensor, characterized in that, Includes plug assembly, fixing assembly and fiber optic assembly; The plug assembly includes a metal plug, an inner mold, a outer shell, a welding wire, a receiving tube, a light-emitting tube, and a light cone; one end of the welding wire is connected to the metal plug, and the other end is connected to the light-emitting tube or the receiving tube; the metal plug is fixed to the inner mold, the light cone is disposed at the light-emitting tube and is used to focus the light emitted by the light-emitting tube and guide it into the optical fiber assembly, the outer shell is fitted onto the inner mold, and the receiving tube, the light-emitting tube, the welding wire, and the light cone are housed within the outer shell, the light-emitting tube including an LED light; The fixing component includes a first fixing frame and a clamping member, the clamping member being used to clamp a human body part, and the first fixing frame being embedded within the clamping member; The optical fiber assembly is used to transmit optical fiber signals between the fixing assembly and the plug assembly.

2. The MR pulse oximeter sensor as described in claim 1, characterized in that, The plug assembly also includes a second fixing bracket, which is disposed inside the housing and is used to fix the light-emitting tube and the receiving tube.

3. The MR blood oxygen sensor as described in claim 2, characterized in that, The second fixing frame is fixed to the light-emitting tube and the receiving tube by filling with glue.

4. The MR pulse oximeter sensor as described in claim 1, characterized in that, The welding line and the outer shell are fixed together by adhesive filling.

5. The MR pulse oximeter sensor as described in claim 1, characterized in that, The welding line has a shielding layer for shielding against external interference.

6. The MR pulse oximeter sensor as described in claim 1, characterized in that, The light cone has a large end and a small end, and the light emitted by the light-emitting tube is guided into the optical fiber assembly after passing through the large end and the small end in sequence.

7. The MR pulse oximeter sensor as described in claim 1, characterized in that, The fixing component also includes a strap, one end of which is connected to the clamp.

8. The MR pulse oximeter sensor as described in claim 1, characterized in that, The metal plug is a non-magnetic plug.

9. The MR blood oxygen sensor as described in claim 1, characterized in that, The optical fiber assembly includes a near-light connector, a far-light connector, and two optical fibers; each optical fiber is connected to a near-light connector and a far-light connector at both ends. The near-light connector is used to connect to the light-emitting tube or the receiving tube, and the far-light connector is used to insert into the first fixing frame.

10. The MR blood oxygen sensor as described in claim 9, characterized in that, The optical fiber assembly also includes a sheath, which is fitted onto the optical fiber.

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