Optical fiber oxyhemoglobin saturation assisted deep venipuncture device

Abstract

The invention provides an optical fiber blood oxygen saturation assisted deep vein puncture device. The optical fiber blood oxygen saturation assisted deep vein puncture device comprises a puncture needle, an optical fiber blood oxygen sensor assembly and a signal monitoring and feedback module. The puncture needle is a hollow needle body and is used for puncturing deep veins of a patient, and a needle point is provided with an opening for blood to enter; the optical fiber blood oxygen sensor assembly is arranged in the puncture needle, the sensing end of the optical fiber blood oxygen sensor assembly is close to the needle tip to make contact with blood entering the needle tip, and the optical fiber blood oxygen sensor assembly is connected to the in-vitro signal monitoring and feedback module through optical fibers. And the signal monitoring and feedback module is used for transmitting an optical signal for detecting the blood oxygen saturation to the optical fiber blood oxygen sensor assembly, receiving a feedback optical signal, calculating the blood oxygen saturation value of the blood at the needle point part and providing feedback information for indicating whether the puncture needle enters the vein or not. By introducing an optical fiber blood oxygen monitoring means, whether the puncture needle point enters the target vein or not can be judged in time, the one-time success rate of deep vein puncture is greatly improved, and pain, injury and the like caused by repeated puncture to a patient are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of venipuncture, in particular to an optical fiber blood oxygen saturation assisted deep vein puncture device. Background Art

[0002] Deep vein puncture (such as central venous catheterization) is a common and important clinical procedure, widely used in critical care, chemotherapy, and emergency venous access. However, due to their hidden location and complex surrounding tissues, locating the deep vein during puncture is challenging. Traditional deep vein puncture relies primarily on the operator's guidance based on anatomical landmarks and on blood return and pressure to determine whether the vein has been entered. However, studies have shown that even among experienced operators, the failure rate of central vein puncture based solely on landmarks can reach 7% to 19.4%. Ultrasound imaging can improve the success rate of puncture, but the high cost and specialized training required for ultrasound equipment have limited its widespread clinical application. In practice, mistaking an artery for a vein or repeated unsuccessful punctures increase the risk of complications such as bleeding, hematoma, and arterial injury. Therefore, a method that provides real-time feedback on whether the needle tip has entered the vein is urgently needed to improve the accuracy and safety of deep vein puncture. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art and proposes an optical fiber blood oxygen saturation assisted deep vein puncture device.

[0004] The present invention provides a fiber optic blood oxygen saturation assisted deep vein puncture device, comprising a puncture needle, a fiber optic blood oxygen sensor assembly, and a signal monitoring and feedback module; The puncture needle is a hollow needle body used to pierce the patient's deep vein and its needle tip is provided with an opening for blood to enter; The fiber optic blood oxygen sensor assembly is disposed in the puncture needle with its sensing end close to the needle tip to contact the blood entering the needle tip, and the fiber optic blood oxygen sensor assembly is connected to the signal monitoring and feedback module outside the body via an optical fiber; The signal monitoring and feedback module is used to transmit an optical signal for detecting blood oxygen saturation to the optical fiber blood oxygen sensor assembly, receive the feedback optical signal and calculate the blood oxygen saturation value of the blood at the needle tip, and provide feedback information indicating whether the puncture needle has entered the vein.

[0005] In some possible embodiments, the fiber optic blood oxygen sensor assembly includes at least two fiber optic channels, respectively used to transmit red light signals and infrared light signals, so as to calculate blood oxygen saturation by utilizing the difference in blood absorption of light of different wavelengths; The sensing end of the fiber optic blood oxygen sensor assembly adopts a reflective measurement structure. The end of the optical fiber is substantially flush with the needle tip opening and has a transparent protective layer to prevent blood from clogging the optical fiber.

[0006] In some possible embodiments, the puncture needle has a double-lumen structure, having a first lumen and a second lumen arranged in parallel; The first lumen is used to fix and accommodate the fiber optic blood oxygen sensor assembly, and the second lumen is used for blood reflux indication or for the passage of a guide wire after successful puncture; The sensing end of the fiber optic blood oxygen sensor assembly is located at the bevel area of ​​the needle tip of the puncture needle, so that blood contacts the sensing end as soon as it enters the needle tip.

[0007] In some possible embodiments, the fiber optic blood oxygen sensor assembly is a removable fiber optic probe, which can be inserted into the inner cavity of the puncture needle to provide blood oxygen monitoring during puncture, and removed from the inner cavity of the puncture needle after confirming that the puncture is successful to free up a channel for guidewire placement or blood return verification; The diameter of the optical fiber probe is smaller than the inner cavity diameter of the puncture needle, and the front end thereof is flush with and aligned with the needle tip of the puncture needle.

[0008] In some possible embodiments, the needle seat portion of the puncture needle has a multi-channel interface, one side interface is used to connect the fiber optic blood oxygen sensor assembly to the signal monitoring and feedback module, and the other side interface is used to connect a syringe or catheter, so as to simultaneously realize blood aspiration verification or guidewire insertion during the puncture process.

[0009] In some possible embodiments, the optical fiber of the fiber optic blood oxygen sensor assembly is made of plastic optical fiber or quartz optical fiber with a diameter ranging from 50 μm to 300 μm, and an anti-fog and anti-coagulation biocompatible coating is coated on the end of the optical fiber.

[0010] In some possible embodiments, the signal monitoring and feedback module includes a light source, a photodetector, a signal processing unit, and an output unit; The light source is used to emit a light signal of a specific wavelength toward the needle tip of the puncture needle; The photoelectric detector is used to receive the reflected light signal returned from the optical fiber blood oxygen sensor assembly; The signal processing unit is configured to receive the electrical signal from the photodetector and calculate the blood oxygen saturation value based on the electrical signal; The output unit is used to display the blood oxygen saturation value and provide feedback information indicating whether the puncture needle has entered the vein.

[0011] In some possible embodiments, the signal processing unit is further configured to generate a warning signal when the detected blood oxygen saturation value is higher than a preset threshold, and generate a success indication signal when the detected blood oxygen saturation value is lower than a preset range and stable.

[0012] In some possible embodiments, the output unit includes an audible and visual alarm device and / or a digital display screen, which is used to provide the operator with an intuitive prompt of the type of blood vessel where the needle tip is located.

[0013] In some possible embodiments, the light source includes a red light source with a wavelength of approximately 660 nm and an infrared light source with a wavelength of approximately 940 nm; The photodetector is a silicon photodiode array; The signal processing unit adopts a proportional calculation method to calculate the blood oxygen saturation value, and has data calibration and noise filtering functions to improve measurement accuracy.

[0014] The fiber-optic blood oxygen saturation-assisted deep vein puncture device of an embodiment of the present invention, by introducing fiber-optic blood oxygen monitoring means, can instantly determine whether the puncture needle tip has entered the target vein, significantly improving the one-time success rate of deep vein puncture and reducing the pain and damage caused to the patient by repeated punctures. This device can promptly distinguish between venous and arterial blood, greatly reducing the risk of accidental arterial puncture and improving the safety of the operation. In addition, the present invention provides real-time, physiological parameter-driven feedback, does not rely on large-scale imaging equipment, and can also be used under conditions of limited resources or bedside operation, and has good clinical application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the structure of the fiber-optic blood oxygen saturation-assisted deep vein puncture device according to an embodiment of the present invention; Figure 2 Schematic diagram of the local structure of the tip of a puncture needle according to an embodiment of the present invention; Figure 3 FIG. 4 is a structural diagram of a signal monitoring and feedback module according to an embodiment of the present invention. DETAILED DESCRIPTION

[0016] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0017] The inventors of this invention discovered that clinically, there is a significant difference in oxygen saturation between venous and arterial blood: venous blood oxygen saturation is typically approximately 70% to 75%, significantly lower than arterial blood, which is approximately 95%. By leveraging this physiological difference, if the oxygen saturation of blood can be monitored in real time at the tip of a puncture needle, it would be possible to determine whether the needle tip has entered the venous cavity or has mistakenly entered an artery.

[0018] Based on this, the present invention designs a fiber-optic blood oxygen saturation-assisted deep vein puncture device. By integrating a miniature fiber-optic blood oxygen saturation sensor into the puncture needle, blood oxygen monitoring feedback is achieved during the puncture process, thereby assisting in locating the deep vein.

[0019] Figure 1 This is a schematic diagram of the structure of a fiber-optic blood oxygen saturation-assisted deep vein puncture device according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the local structure of the puncture needle tip according to an embodiment of the present invention. Figure 1 and Figure 2 As shown, an embodiment of the present invention relates to a fiber optic blood oxygen saturation assisted deep vein puncture device, including a puncture needle 1, a fiber optic blood oxygen sensor assembly 2 and a signal monitoring and feedback module 3.

[0020] For example, Figure 1 and Figure 2 As shown, the puncture needle 1 is a hollow needle body used to pierce the patient's deep vein and its needle tip 11 is provided with an opening for blood to enter. In some embodiments, the puncture needle can be a medical stainless steel hollow needle, and the needle tip 11 has a bevel opening to facilitate piercing tissue and allowing blood to enter the needle cavity.

[0021] For example, Figure 1 and Figure 2 As shown, the fiber optic blood oxygen sensor assembly 2 is arranged in the puncture needle 1 and its sensing end 21 is close to the needle tip 11 to contact the blood entering the needle tip 11. The fiber optic blood oxygen sensor assembly 2 is connected to the signal monitoring and feedback module 3 outside the body through an optical fiber.

[0022] In some embodiments, as Figure 1 and Figure 2 As shown, the fiber optic blood oxygen sensor assembly 2 is arranged inside the puncture needle 1 or integrated along the wall of the puncture needle. The sensing end 21 of the sensor is located near the opening of the needle tip 11 and is in contact with the external blood. The other end of the sensor is connected to the signal monitoring and feedback device 3 outside the body through an optical fiber.

[0023] In some embodiments, as Figure 1 and Figure 2As shown, the fiber-optic blood oximetry sensor assembly 2 can be made of a thin-diameter biocompatible optical fiber and is arranged along the lumen of the puncture needle 1. Its front sensing portion 21 is located at the needle tip 11 and is flush with the needle tip bevel. The rear end of the fiber-optic blood oximetry sensor assembly 2 is sealed and extends beyond the puncture needle through a needle holder, connecting to the signal monitoring and feedback module 3.

[0024] For example, Figure 1 and Figure 2 As shown, the signal monitoring and feedback module 3 is used to transmit an optical signal for detecting blood oxygen saturation to the optical fiber blood oxygen sensor assembly 2, receive the feedback optical signal and calculate the blood oxygen saturation value of the blood at the needle tip, and provide feedback information indicating whether the puncture needle has entered the vein.

[0025] In the above embodiment, the fiber-optic blood oximetry sensor assembly 2 is fixedly embedded within the puncture needle, without affecting the needle's basic access function. The needle hub is equipped with a lateral catheter port 12, which can be connected to a syringe for aspiration or to place a guidewire for subsequent cannulation after successful puncture. The fiber-optic blood oximetry sensor assembly 2 is integrated with the needle hub via a dedicated seal, ensuring that the needle lumen is leak-proof when connected to the catheter port 12. During needle insertion, the operator can read the blood oxygen saturation value at the needle tip in real time on the display screen of the signal monitoring and feedback module 3. When the displayed value rapidly decreases and stabilizes at venous level (for example, from the ambient air reading to approximately 70%), the needle tip is considered to have entered the vein. At this point, the signal monitoring and feedback module 3 will emit an audible and visual warning signal, prompting the operator to stop advancing. If the blood oxygen saturation reading momentarily rises to near 95% during needle insertion, it indicates that an artery may have been punctured. The device will immediately sound an alarm, prompting the operator to quickly withdraw the needle to avoid further damage.

[0026] The fiber-optic blood oxygen saturation-assisted deep vein puncture device of an embodiment of the present invention, by introducing fiber-optic blood oxygen monitoring means, can instantly determine whether the puncture needle tip has entered the target vein, significantly improving the one-time success rate of deep vein puncture and reducing the pain and damage caused to the patient by repeated punctures. This device can promptly distinguish between venous and arterial blood, greatly reducing the risk of accidental arterial puncture and improving the safety of the operation. In addition, the present invention provides real-time, physiological parameter-driven feedback, does not rely on large-scale imaging equipment, and can also be used under conditions of limited resources or bedside operation, and has good clinical application prospects.

[0027] For example, Figure 1 and Figure 2As shown, the fiber optic blood oximetry sensor assembly 2 includes at least two optical fiber channels, one for transmitting red light and the other for transmitting infrared light. This allows calculation of blood oxygen saturation by utilizing the differential absorption of light of different wavelengths by blood. The sensing end 21 of the fiber optic blood oximetry sensor assembly 2 utilizes a reflective measurement structure. The end of the optical fiber is substantially flush with the opening of the needle tip 11 and has a transparent protective layer to prevent blood from clogging the fiber.

[0028] The fiber-optic blood oxygen saturation-assisted deep vein puncture device of an embodiment of the present invention calculates blood oxygen saturation by the absorption ratio of red light to infrared light, avoiding the error of single-wavelength measurement and significantly improving the ability to distinguish between venous blood and arterial blood. In addition, the design of the sensing end flush with the needle tip ensures that the optical signal acts directly on the blood entering the needle tip, reducing tissue scattering interference; the transparent protective layer not only protects the optical fiber end face but also maintains the transmittance of the light path, avoiding signal attenuation caused by blood adhesion. During the puncture process, the operator can immediately determine the position of the needle tip based on the blood oxygen saturation value (for example, a sudden drop to 70% indicates venous entry, and a sudden rise to 95% warns of mis-puncture of the artery), reducing the risk of blind puncture. In addition, the transparent protective layer (such as a heparin coating) can inhibit blood coagulation, ensuring that the sensor continues to work effectively during long-term punctures and avoiding monitoring failure due to blood clot blockage.

[0029] For example, Figure 1 and Figure 2 As shown, the puncture needle 1 has a dual-lumen structure, having a first lumen and a second lumen arranged in parallel; the first lumen is fixedly accommodated in the fiber optic blood oxygen sensor assembly 2, and the second lumen is used for blood reflux indication or for the passage of a guide wire after a successful puncture; the sensing end 21 of the fiber optic blood oxygen sensor assembly 2 is located in the bevel area of ​​the needle tip of the puncture needle 1, so that blood contacts the sensing end 21 as soon as it enters the needle tip.

[0030] Specifically, in this embodiment, the puncture needle 1 has a dual-lumen structure, with a first lumen and a second lumen arranged in parallel on the needle body. The first lumen is for the fiber optic blood oxygen sensor assembly to be embedded, and the second lumen is for blood return or guide wire passage. The sensing end of the fiber optic blood oxygen sensor assembly is exposed flush with the bevel of the puncture needle tip, ensuring that blood contacts the sensor as soon as it enters the needle tip; secondly, the fiber optic blood oxygen sensor assembly is made into a slender and flexible probe that can be removably inserted into the inner lumen of the hollow puncture needle. During puncture, it is placed in the needle to provide blood oxygen monitoring. After confirming venous entry, the fiber optic probe can be removed to free up the inner lumen for guide wire insertion or blood return verification. These layout methods ensure that the fiber optic sensor neither significantly increases the diameter of the puncture needle nor interferes with normal puncture and catheterization operations.

[0031] In the fiber-optic blood oxygen saturation-assisted deep vein puncture device of an embodiment of the present invention, after blood enters the needle tip, the sensor detects blood oxygen saturation within milliseconds and uses audio and visual signals to indicate the needle tip position, avoiding blind puncture. A sudden rise in the blood oxygen value (>90%) triggers an alarm for false arterial puncture, significantly reducing the risk of false arterial puncture (the false arterial puncture rate with traditional methods can reach 8%). Furthermore, through the independent dual-lumen design, the first lumen is dedicated to sensing, preventing blood backflow from interfering with the signal; the second lumen retains traditional functions (blood return verification / guidewire placement), eliminating the need to change clinical operating habits.

[0032] For example, Figure 1 and Figure 2 As shown, the fiber optic blood oxygen sensor assembly 2 is a removable fiber optic probe, which can be inserted into the inner cavity of the puncture needle to provide blood oxygen monitoring during puncture, and removed from the inner cavity of the puncture needle 1 after confirming that the puncture is successful to free up a channel for guide wire insertion or blood return verification; the diameter of the fiber optic probe is smaller than the inner cavity diameter of the puncture needle and its front end is flush with the needle tip 11 of the puncture needle 1.

[0033] Specifically, in this embodiment, the fiber optic blood oxygen sensor assembly 2 can be inserted into the puncture needle 1 as a detachable fiber optic probe. The needle holder of the puncture needle 1 is designed with an axial through-hole for the fiber optic probe to pass through, and a quick-connect interface is provided on the outside to connect to the signal monitoring and feedback module 3. During operation, the fiber optic probe is inserted into the needle cavity until the needle tip before puncture, and is inserted along with the puncture needle to provide real-time blood oxygen monitoring. Once the signal monitoring and feedback module 3 indicates that the needle tip 11 has entered the vein, the operator can fix the needle body, remove the fiber optic probe, and connect the syringe through the needle holder to confirm blood return, or directly insert the guide wire for intravenous catheterization.

[0034] The fiber-optic oximetry-assisted deep vein puncture device of this embodiment features a removable probe design, ensuring monitoring functionality without compromising the traditional deep vein puncture and catheterization process. The fiber-optic probe has a very small diameter (e.g., <= 0.3 mm), minimally impacting the needle tip's position during insertion or removal. The sensor surface undergoes special optical treatment to enhance reflected signals and reduce blood adhesion. The signal monitoring and feedback device provides a green light when the needle tip is in place and a red light and buzzer alarm when an abnormality is detected, enhancing clinical convenience and safety.

[0035] For example, Figure 1 and Figure 2As shown, the needle hub of the puncture needle 1 has a multi-port interface. One port is used to connect the fiber-optic blood oximetry sensor assembly 2 to the signal monitoring and feedback module 3, and the other port is used to connect a syringe or catheter, so as to simultaneously perform blood aspiration verification or guidewire insertion during the puncture process. In some embodiments, the optical fiber of the fiber-optic blood oximetry sensor assembly 2 is made of plastic optical fiber or quartz optical fiber with a diameter ranging from 50μm to 300μm, and the optical fiber end is coated with a biocompatible coating that is anti-fog and anti-coagulation.

[0036] For example, Figure 3 As shown, the signal monitoring and feedback module 3 includes a light source 31, a photodetector 32, a signal processing unit 33, and an output unit 34. The light source 31 is used to emit a light signal of a specific wavelength toward the tip of the puncture needle; the photodetector 32 is used to receive the reflected light signal returned from the fiber optic blood oxygen sensor assembly 2. The signal processing unit 33 is used to receive the electrical signal from the photodetector 32 and calculate the blood oxygen saturation value based on the electrical signal. The output unit 34 is used to display the blood oxygen saturation value and provide feedback information indicating whether the puncture needle has entered the vein.

[0037] In some embodiments, as Figure 3 As shown, the signal processing unit 33 is further configured to generate a warning signal when the detected blood oxygen saturation value is higher than a preset threshold, and generate a success indication signal when the detected blood oxygen saturation value is lower than a preset range and stable.

[0038] For example, Figure 3 As shown, the output unit 34 may include an audible and visual alarm device and / or a digital display screen, for providing the operator with an intuitive prompt of the type of blood vessel where the needle tip is located.

[0039] In some embodiments, the light source 31 includes a red light source with a wavelength of approximately 660 nm and an infrared light source with a wavelength of approximately 940 nm; the photodetector 32 is a silicon photodiode array; the signal processing unit 33 uses a proportional calculation method to calculate the blood oxygen saturation value and has data calibration and noise filtering functions to improve measurement accuracy.

[0040] The fiber-optic blood oxygen saturation-assisted deep vein puncture device of the embodiment of the present invention integrates a fiber-optic blood oxygen saturation sensor into the puncture needle, thereby achieving a fusion of puncture positioning technology and optical detection technology. It can provide the operator with real-time physiological parameter feedback information without significantly changing the puncture operation process. The device has a compact structure, simple operation, and good applicability. For deep veins that are difficult to locate using traditional methods (such as the internal jugular vein of obese patients and the deep veins of patients with hypotensive shock), the present invention can significantly improve the puncture success rate and reduce the risks and discomfort caused to patients by repeated exploration. At the same time, the device can also be promoted and applied to peripheral deep vein puncture, vein sampling, and small vascular interventional procedures that require distinguishing between veins and arteries, and has broad application prospects.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fiber-optic blood oxygen saturation-assisted deep vein puncture device, characterized in that: Includes a puncture needle, a fiber optic blood oxygen sensor assembly, and a signal monitoring and feedback module; The puncture needle is a hollow needle body used to pierce the patient's deep vein and its needle tip is provided with an opening for blood to enter; The fiber optic blood oxygen sensor assembly is disposed in the puncture needle with its sensing end close to the needle tip to contact the blood entering the needle tip, and the fiber optic blood oxygen sensor assembly is connected to the signal monitoring and feedback module outside the body via an optical fiber; The signal monitoring and feedback module is used to transmit an optical signal for detecting blood oxygen saturation to the optical fiber blood oxygen sensor assembly, receive the feedback optical signal and calculate the blood oxygen saturation value of the blood at the needle tip, and provide feedback information indicating whether the puncture needle has entered the vein.

2. The fiber-optic blood oxygen saturation-assisted deep vein puncture device according to claim 1, characterized in that: The fiber optic blood oxygen sensor assembly includes at least two fiber optic channels, which are used to transmit red light signals and infrared light signals respectively, so as to calculate blood oxygen saturation by utilizing the difference in blood absorption of light of different wavelengths; The sensing end of the fiber optic blood oxygen sensor assembly adopts a reflective measurement structure. The end of the optical fiber is substantially flush with the needle tip opening and has a transparent protective layer to prevent blood from clogging the optical fiber.

3. The fiber-optic blood oxygen saturation-assisted deep vein puncture device according to claim 1, characterized in that: The puncture needle has a double-lumen structure, with a first lumen and a second lumen arranged in parallel; The first lumen is used to fix and accommodate the fiber optic blood oxygen sensor assembly, and the second lumen is used for blood reflux indication or for the passage of a guide wire after successful puncture; The sensing end of the fiber optic blood oxygen sensor assembly is located at the bevel area of ​​the needle tip of the puncture needle, so that blood contacts the sensing end as soon as it enters the needle tip.

4. The fiber-optic blood oxygen saturation-assisted deep vein puncture device according to claim 1, characterized in that: The fiber optic blood oxygen sensor assembly is a removable fiber optic probe that can be inserted into the lumen of the puncture needle to provide blood oxygen monitoring during puncture. After confirming that the puncture is successful, it is removed from the lumen of the puncture needle to free up a channel for guidewire placement or blood return verification. The diameter of the optical fiber probe is smaller than the inner cavity diameter of the puncture needle, and the front end thereof is flush with and aligned with the needle tip of the puncture needle.

5. The fiber-optic blood oxygen saturation-assisted deep vein puncture device according to any one of claims 1 to 4, characterized in that: The needle hub of the puncture needle has a multi-channel interface, one side of the interface is used to connect the fiber optic blood oxygen sensor assembly to the signal monitoring and feedback module, and the other side of the interface is used to connect a syringe or a catheter, so as to achieve blood aspiration verification or guidewire insertion simultaneously during the puncture process.

6. The fiber-optic blood oxygen saturation-assisted deep vein puncture device according to any one of claims 1 to 4, characterized in that: The optical fiber of the optical fiber blood oxygen sensor assembly is made of plastic optical fiber or quartz optical fiber with a diameter ranging from 50 μm to 300 μm, and the end of the optical fiber is coated with an anti-fog and anti-coagulation biocompatible coating.

7. The fiber-optic blood oxygen saturation-assisted deep vein puncture device according to any one of claims 1 to 4, characterized in that: The signal monitoring and feedback module includes a light source, a photodetector, a signal processing unit and an output unit; The light source is used to emit a light signal of a specific wavelength toward the needle tip of the puncture needle; The photoelectric detector is used to receive the reflected light signal returned from the optical fiber blood oxygen sensor assembly; The signal processing unit is configured to receive the electrical signal from the photodetector and calculate the blood oxygen saturation value based on the electrical signal; The output unit is used to display the blood oxygen saturation value and provide feedback information indicating whether the puncture needle has entered the vein.

8. The fiber-optic blood oxygen saturation-assisted deep vein puncture device according to claim 7, characterized in that: The signal processing unit is further configured to generate a warning signal when the detected blood oxygen saturation value is higher than a preset threshold, and generate a success indication signal when the detected blood oxygen saturation value is lower than a preset range and is stable.

9. The fiber-optic blood oxygen saturation-assisted deep vein puncture device according to claim 8, characterized in that: The output unit includes an audible and visual alarm device and / or a digital display screen, which is used to provide the operator with an intuitive prompt of the type of blood vessel where the needle tip is located.

10. The fiber-optic blood oxygen saturation-assisted deep vein puncture device according to claim 7, characterized in that: The light source includes a red light source with a wavelength of about 660 nm and an infrared light source with a wavelength of about 940 nm; The photodetector is a silicon photodiode array; The signal processing unit adopts a proportional calculation method to calculate the blood oxygen saturation value, and has data calibration and noise filtering functions to improve measurement accuracy.

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