Integrated blood line sensor waterproof pressure protection structure

Abstract

This invention relates to the field of medical device technology, specifically to an integrated waterproof and pressure-testing protection structure for a blood circuit sensor, comprising a protective cover body; a sleeve fixedly connected to one end of the protective cover body, and a connecting tube fixedly connected to the other end of the protective cover body; a dialysis machine pressure sensor is housed inside the sleeve; a receiving cavity is formed inside the protective cover body, and a sealing membrane is installed inside the receiving cavity, seamlessly fitting the sealing membrane to the inner wall of the receiving cavity, dividing the receiving cavity into a sealed first cavity and a second cavity. The sealing membrane is used to prevent blood from entering the first cavity and external liquids from entering the second cavity, and the connecting tube communicates with the second cavity; a pressure monitoring branch tube is fixedly connected to the end of the connecting tube away from the protective cover body. The protective cover body and the blood circuit tube of this invention are designed as an integrated structure, and the medical-grade sealing membrane inside the protective cover isolates the sensor detection end, forming a sealed space that prevents blood and external liquids from seeping in without affecting pressure transmission.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to an integrated waterproof and pressure-testing protection structure for a blood circuit sensor. Background Technology

[0002] Blood circuit sensor protectors are critical, disposable, sterile protective components installed at the arterial / venous pressure monitoring ports in extracorporeal circulation blood circuits such as hemodialysis, CRRT, and ECMO. Their core function is to protect the machine's pressure sensors, prevent contamination and leakage, and ensure accurate pressure monitoring.

[0003] In existing technologies, such as the B. Braun 5202507C disposable blood pressure sensor, it mainly consists of a pressure sensor, a pressure chamber, a transmission line, and a protective sleeve. It is mainly used for real-time continuous monitoring of invasive arterial pressure and central venous pressure in patients, converting intravascular pressure signals into electrical signals and transmitting them to a monitor or dialysis machine to provide pressure data for diagnosis and treatment.

[0004] However, in actual use of the aforementioned disposable blood pressure sensor, the accompanying protective sleeve is a separate design, requiring on-site assembly. Gaps exist at the connections between the protective sleeve and the sensor / tubing, making it prone to liquid seepage during clinical disinfection or when blood leaks from the tubing. This can lead to contamination of the sensor or blood tubing, making it difficult to simultaneously meet the clinical requirements of waterproofing, blood leakage prevention, and pressure transmission. Therefore, it is necessary to propose an integrated waterproof and pressure-testing protection structure for the blood tubing sensor to solve the above problems. Summary of the Invention

[0005] To address the aforementioned issues, this invention provides an integrated waterproof and pressure-testing protection structure for a blood circuit sensor. This structure integrates the sensor cover and the blood circuit into a single unit, eliminating the need for separate connections and preventing the risk of detachment. Simultaneously, a medical-grade sealing membrane is installed inside the cover, seamlessly fitting the inner wall of the cover to isolate the sensor detection end, creating a sealed space. This effectively prevents the infiltration of blood and external liquids without affecting pressure transmission, thus avoiding sensor contamination and reducing the risk of hospital-acquired infections in hemodialysis patients.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: An integrated waterproof and pressure-measuring protection structure for a blood circuit sensor, comprising a protective cover body; a sleeve is fixedly connected to one end of the protective cover body, and a connecting pipe is fixedly connected to the other end of the protective cover body; a dialysis machine pressure sensor is provided inside the sleeve; a receiving cavity is opened inside the protective cover body, and a sealing membrane is provided inside the receiving cavity. The sealing membrane is seamlessly attached to the inner wall of the receiving cavity, and the sealing membrane divides the receiving cavity into a sealed first cavity and a second cavity. The sealing membrane is used to isolate blood from entering the first cavity and external liquid from entering the second cavity. The connecting pipe communicates with the second cavity. The detection end of the dialysis machine pressure sensor is located in the first cavity, and the sealing membrane and the detection end of the dialysis machine pressure sensor are in contact; a pressure monitoring branch pipe is fixedly connected to the end of the connecting pipe away from the protective cover body; an automatic blocking component for automatically blocking blood from entering the first cavity is provided inside the first cavity.

[0007] The technical principles of the above solution are as follows:

[0008] The connecting tube and blood circuit tubing are integrally formed and connected, allowing pressure within the blood circuit tubing to be transmitted to the second chamber. The sealing membrane seamlessly adheres to the inner wall of the receiving chamber, dividing the chamber into a first and second chamber, forming a completely isolated, sealed space. This physically blocks blood, exudate, disinfectant, and external contaminants from entering the first chamber, preventing sensor contamination, and simultaneously preventing external liquids from seeping into the second chamber and contaminating the blood circuit tubing. The sealing membrane is highly elastic, thin and uniform, and exhibits no pressure attenuation. Pressure fluctuations within the blood circuit can be transmitted through the sealing membrane to the dialysis machine pressure sensor detection end in the first chamber, ensuring that the pressure signal is not distorted or delayed, meeting clinical monitoring requirements. In the event of accidental rupture of the sealing membrane, the automatic blocking component immediately triggers closure, cutting off the path of blood into the receiving chamber and further preventing blood from intruding into the sensor area.

[0009] The above approach has the following beneficial effects:

[0010] 1. This solution adopts an integrated structure of connecting tube and blood circuit tube, eliminating the gap of separate assembly, preventing the protective cover from loosening or falling off, and eliminating the need for on-site assembly in clinical use, simplifying the operation process and thus improving the work efficiency of medical staff.

[0011] 2. This solution uses a medical polyurethane sealing membrane to form a double-cavity isolation structure, thereby blocking blood from entering the sensor, disinfectant, and exudate from entering the blood circuit. At the same time, the pressure in the blood circuit can be transmitted to the dialysis machine pressure sensor detection end in the first cavity through the sealing membrane, thus ensuring that the pressure signal is transmitted without attenuation or distortion, achieving both waterproof and blood leakage prevention and pressure measurement, reducing the risk of hospital-acquired infections and equipment damage.

[0012] 3. The protective cover of this solution has a built-in automatic blocking component, which can immediately close and lock in the event of accidental damage to the sealing membrane or blood backflow, providing double protection to prevent blood from entering the sensor cavity and further improving the safety and reliability of extracorporeal circulation therapy.

[0013] Furthermore, the sealing membrane is made of medical-grade polyurethane membrane material, and the thickness of the sealing membrane is 0.1-0.3 mm.

[0014] Beneficial effects: Medical-grade polyurethane material is biocompatible and chemically resistant, allowing for long-term contact with blood without the risk of toxic leaching; the ultra-thin design of 0.1-0.3mm ensures physical structural strength and tear resistance while minimizing pressure transmission resistance, ensuring that pressure signals do not significantly attenuate when passing through the membrane layer.

[0015] Furthermore, the connection between the connecting tube and the blood circuit tube is fixedly equipped with a reinforcing protrusion.

[0016] Beneficial effects: The reinforcing protrusions enhance the mechanical strength of the integrally formed connection between the connecting tube and the blood circuit tube, reducing the risk of breakage and cracking at the connection point when the clinical tubing is pulled, bent, or twisted, extending the service life of the device, and ensuring the long-term stability and safety of the blood circuit connection during extracorporeal circulation therapy.

[0017] Furthermore, the outer wall of the protective cover body is provided with anti-slip texture; the inner diameter of the sleeve is adapted to the outer diameter of the dialysis machine sensor.

[0018] Beneficial effects: The anti-slip texture on the outside of the protective cover makes it easier for medical staff to grip the cover, reducing the risk of operational errors caused by hand slippage.

[0019] Furthermore, the protective cover body is made of either medical-grade PVC or silicone material.

[0020] Beneficial effects: The use of medical-grade PVC or silicone materials ensures that the device meets the biocompatibility standards for medical devices, is non-toxic and non-irritating, can withstand high-temperature and high-pressure steam sterilization, and meets the clinical requirements for single-use sterility; at the same time, this type of material has good flexibility and processing performance, which facilitates one-piece molding manufacturing, reduces production costs, and is easy to promote on a large scale.

[0021] Furthermore, the sealing membrane is seamlessly bonded to the inner wall of the cavity using ultrasonic welding.

[0022] Beneficial effects: The use of ultrasonic welding technology achieves a seamless fit between the sealing membrane and the inner wall of the cavity. Compared with traditional adhesive methods, the welded joint is tighter and gapless, and it is not easy to delaminate after long-term use. The sealing performance is more stable and reliable, and it can effectively prevent blood, liquid and bacteria from seeping in from the seam.

[0023] Furthermore, the automatic blocking component includes elastic semi-diaphragms symmetrically fixedly connected to the inner sidewall of the first cavity; the protective cover body has symmetrically opened contact cavities and channels in its sidewall, one end of each channel communicating with the first cavity, and the other end of each channel communicating with its adjacent contact cavity, and each channel is connected to a one-way valve. Pull wires are fixedly connected to the sidewall of each elastic semi-diaphragm, and the end of each pull wire away from the elastic semi-diaphragm extends through the sidewall of the first cavity to the adjacent contact cavity and is fixedly connected to the inner sidewall of the contact cavity.

[0024] Beneficial effects: Under normal use, the elastic half-membrane remains open under the traction of the pull wire, which does not affect the contact between the sealing membrane and the sensor detection end or the pressure transmission; when the sealing membrane is damaged and blood enters the first chamber, it can trigger the pull wire to fail, and the elastic half-membrane will close quickly under its own elasticity, thereby sealing and blocking the first chamber and quickly cutting off the path of blood to invade the sensor.

[0025] Furthermore, the portion of the pull cord located within the contact cavity is made of a water-soluble material, while the portion of the pull cord located within the first cavity is made of medical-grade nylon.

[0026] Beneficial effects: The water-soluble wire inside the contact cavity remains intact under normal dry conditions. Once the sealing membrane is damaged, blood or exudate will enter the contact cavity through the channel, causing the water-soluble wire to dissolve and break quickly, releasing the traction on the elastic half membrane, achieving rapid response, and automatically triggering the blocking without electrical signals or manual intervention.

[0027] Furthermore, the elastic semi-membrane is made of medical-grade silicone material.

[0028] Beneficial effects: Medical-grade silicone material has excellent biocompatibility, elasticity and aging resistance. It is non-toxic and non-irritating, and can be in contact with blood for a long time without producing adverse reactions.

[0029] Furthermore, the water-soluble material is medical-grade cross-linked carboxymethyl cellulose sodium.

[0030] Beneficial effects: Medical cross-linked sodium carboxymethyl cellulose is a pharmacopoeia-grade medical polymer material that has the characteristics of rapidly softening and breaking upon contact with water, but without dissolving or disintegrating, and without shedding debris. It can maintain sufficient tensile strength in a dry state to reliably pull the elastic half-membrane to maintain the channel opening, and can also rapidly lose structural strength after contact with blood to achieve an electrical-free, purely physical, and instantaneously triggered blocking action. This material is non-toxic, non-allergenic, and poses no risk of biological contamination. After breaking, it remains confined to the contact cavity and does not enter the blood circulation, thus improving the overall structural stability and clinical safety. Attached Figure Description

[0031] Figure 1 This is an isometric view of the waterproof and pressure-testing protection structure of the integrated blood circuit sensor of the present invention.

[0032] Figure 2This is a side sectional view of the waterproof and pressure-testing protection structure of the integrated blood circuit sensor of the present invention.

[0033] Figure 3 This diagram shows the connection position of the integrated blood circuit sensor waterproof and pressure-testing protection structure of the present invention within the blood circuit.

[0034] Figure 4 This is a side cross-sectional view of the blocking component in the integrated blood circuit sensor waterproof and pressure-testing protection structure of the present invention.

[0035] Figure 5 for Figure 4 Enlarged view of section A.

[0036] Figure 6 This is a schematic diagram of the state of the elastic half-film after the pull wire breaks in the waterproof and pressure-testing protection structure of the integrated blood circuit sensor of the present invention.

[0037] The reference numerals in the accompanying drawings of the instruction manual include: 1. Protective cover body; 2. Sleeve; 3. Connecting pipe; 4. Dialysis machine pressure sensor; 5. Reinforcing protrusion; 6. Sealing membrane; 7. First chamber; 8. Second chamber; 9. Pressure monitoring branch pipe; 10. Elastic half membrane; 12. Pull wire; 13. Contact chamber; 14. One-way valve. Detailed Implementation

[0038] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0041] The following detailed description illustrates the specific implementation method:

[0042] Example 1:

[0043] As attached Figure 1 As shown: An integrated blood circuit sensor waterproof and pressure-testing protection structure includes a protective cover body 1. In this embodiment, the inner diameter of the protective cover body 1 is 8mm and the overall length is 25mm.

[0044] The protective cover body 1 is made of either medical-grade PVC or silicone. In this embodiment, the protective cover body 1 is made of silicone. Silicone is non-toxic and non-irritating, and can withstand high-temperature and high-pressure steam sterilization, meeting the clinical requirements for single-use sterility. Silicone also has good flexibility and processing properties, making it easy to manufacture in one piece, reducing production costs, and facilitating large-scale promotion.

[0045] One end of the protective cover body 1 is integrally injection molded with a sleeve 2, and the other end of the protective cover body 1 is integrally injection molded with a connecting tube 3.

[0046] like Figure 2 As shown, the sleeve 2 is equipped with a dialysis machine pressure sensor 4. In this embodiment, a spiral groove is opened on the inner side wall of the sleeve 2, and a thread is opened on the outer side wall of the dialysis machine pressure sensor 4. The dialysis machine pressure sensor 4 is detachably connected to the spiral groove on the sleeve 2 through the thread, so that it can be easily removed and replaced quickly when the dialysis machine pressure sensor 4 is damaged.

[0047] The protective cover body 1 has an inner cavity, and a sealing membrane 6 is provided inside the cavity. The sealing membrane 6 is made of medical polyurethane membrane material and has a thickness of 0.1 mm. In this embodiment, the protective cover body 1 is divided into an upper part and a lower part during injection molding. The upper part and the lower part are welded together by ultrasonic welding. Before ultrasonic welding is performed on the upper part and the lower part of the protective cover body 1, the sealing membrane 6 is seamlessly attached to the inner wall of the cavity by ultrasonic welding.

[0048] The sealing membrane 6 divides the receiving cavity into a sealed first cavity 7 and a second cavity 8. The sealing membrane 6 is used to prevent blood from entering the first cavity 7 and external liquid from entering the second cavity 8. The connecting tube 3 is connected to the second cavity 8. The detection end of the dialysis machine pressure sensor 4 is located in the first cavity 7, and the sealing membrane 6 is in contact with the detection end of the dialysis machine pressure sensor 4.

[0049] like Figure 3 As shown, the end of the connecting tube 3 furthest from the protective cover body 1 is integrally injection molded and connected to the pressure monitoring branch tube 9. In this embodiment, the connection point between the pressure monitoring branch tube 9 and the blood circuit tube is located at the arterial pressure monitoring port or the venous pressure monitoring port of the blood circuit tube.

[0050] The connection between the connecting tube 3 and the blood circuit tube is integrally molded with a reinforcing protrusion 5. The reinforcing protrusion 5 enhances the mechanical strength of the integrally molded connection between the connecting tube 3 and the blood circuit tube, reduces the problem of breakage and cracking of the connection when the clinical tubing is pulled, bent and twisted, extends the service life of the device, and ensures the long-term stability and safety of the blood circuit connection during extracorporeal circulation treatment.

[0051] The outer wall of the protective cover body 1 is engraved with anti-slip textures, which facilitates the gripping of the protective cover body 1 by medical staff and reduces the risk of operational errors caused by hand slippage. The inner diameter of the sleeve 2 is compatible with the outer diameter of mainstream dialysis machine sensors on the market, for example, ∅=6mm.

[0052] Combination Figure 2 and Figure 3 As shown, the connecting tube 3 and the pressure monitoring branch tube 9 are integrally formed and connected, allowing the pressure of the blood in the blood circuit to be transmitted to the second chamber 8 and actuate the sealing membrane 6, causing it to deform. Since the sealing membrane 6 is in contact with the detection end of the dialysis machine pressure sensor 4, the pressure detected by the detection end of the dialysis machine pressure sensor 4 is the true pressure value of the blood flow in the blood circuit. With a thickness of 0.1 mm, the sealing membrane 6 only undergoes elastic deformation without pressure attenuation, and can transmit the blood flow pressure in the second chamber 8 to the detection end of the dialysis machine pressure sensor 4 without loss, distortion, or delay. This ensures that the pressure data displayed by the monitor or dialysis machine is consistent with the actual pressure in the patient's body, meeting the high precision and high reliability requirements of pressure monitoring for extracorporeal circulation treatments such as hemodialysis, CRRT, and ECMO.

[0053] The sealing membrane 6 fits seamlessly with the inner wall of the receiving cavity, dividing the cavity into a first cavity 7 and a second cavity 8, forming two completely isolated and sealed spaces. This physically blocks blood from entering the first cavity 7 and external liquids from entering the second cavity 8, preventing contamination of the dialysis machine pressure sensor 4, and also preventing external liquids from seeping into the second cavity 8 from contaminating the blood tubing.

[0054] This solution adopts an integrated structure of the connecting tube 3 and the blood circuit tube, eliminating the gaps in the separate assembly and preventing the protective cover body 1 from loosening or falling off. Clinical use requires no on-site assembly, simplifying the operation process and improving the work efficiency of medical staff. Simultaneously, this solution uses a medical polyurethane sealing membrane 6 to form a double-cavity isolation structure, thereby preventing blood from entering the dialysis machine pressure sensor 4, disinfectant, and exudate from entering the blood circuit tube. At the same time, the pressure within the blood circuit can be transmitted through the sealing membrane 6 to the detection end of the dialysis machine pressure sensor 4 in the first cavity 7, ensuring that the pressure signal is transmitted without attenuation or distortion. This achieves both waterproofing and blood leakage prevention as well as pressure measurement, reducing the risk of hospital-acquired infections and equipment damage.

[0055] Example 2:

[0056] As attached Figure 4 As shown, the difference from Embodiment 1 is that the first cavity 7 is provided with an automatic blocking component for automatically blocking blood from entering the first cavity 7.

[0057] like Figure 4 and Figure 5 As shown, specifically, the automatic blocking component includes an elastic semi-membrane 10 symmetrically injection molded integrally onto the inner wall of the first cavity 7. The elastic semi-membrane 10 is made of medical-grade silicone material.

[0058] The protective cover body 1 has symmetrically opened contact cavities 13 and channels on its side wall. One end of each channel is connected to the first cavity 7, and the other end of each channel is connected to the adjacent contact cavity 13. Each channel is connected to a one-way valve 14. In this embodiment, the liquid flow direction of the one-way valve 14 in the channel is from the first cavity 7 into the contact cavity 13.

[0059] Pull wires 12 are fixedly bonded to the sidewalls of the elastic half-membrane 10. The end of the pull wires 12 away from the elastic half-membrane 10 passes through the sidewall of the first cavity 7 and extends into the adjacent contact cavity 13, and is fixedly bonded to the inner sidewall of the contact cavity 13.

[0060] The portion of the pull cord 12 located within the contact cavity 13 is made of a water-soluble material, specifically medical-grade cross-linked carboxymethyl cellulose sodium; the portion of the pull cord 12 located within the first cavity 7 is made of medical-grade nylon material.

[0061] Combination Figure 4 and Figure 5As shown, during normal use, the two adjacent elastic half-membranes 10 remain open under the traction of the pull wire 12, which does not affect the contact and pressure transmission between the sealing membrane 6 and the detection end of the dialysis machine pressure sensor 4. When the sealing membrane 6 is damaged, blood enters the first chamber 7 and then the contact chamber 13, coming into contact with the pull wire 12 in the contact chamber 13. Since this part of the pull wire 12 is made of water-soluble material and the blood contains about 80% to 85% water, this part of the pull wire 12 will dissolve, causing the pull wire 12 to break. At this time, the two adjacent elastic half-membranes 10 quickly close under their own elasticity (as shown in the image). Figure 6 As shown in the figure, in this embodiment, two adjacent elastic half membranes 10 close together to form a circle, thereby achieving the sealing and blocking of the first cavity 7, quickly cutting off the path of blood entering the dialysis machine pressure sensor 4, achieving rapid response, without electrical signals or manual intervention, and automatically triggering the blocking.

[0062] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. An integrated blood line sensor waterproof pressure maintaining protection structure, characterized by, Includes a protective cover body (1); a sleeve (2) is fixedly connected to one end of the protective cover body (1), and a connecting pipe (3) is fixedly connected to the other end of the protective cover body (1); The sleeve (2) is equipped with a dialysis machine pressure sensor (4), and the protective cover body (1) has a receiving cavity. The receiving cavity is equipped with a sealing membrane (6). The sealing membrane (6) fits seamlessly with the inner wall of the receiving cavity. The sealing membrane (6) divides the receiving cavity into a sealed first cavity (7) and a second cavity (8). The sealing membrane (6) is used to isolate blood from entering the first cavity (7) and external liquid from entering the second cavity (8). The connecting tube (3) is connected to the second cavity (8). The detection end of the dialysis machine pressure sensor (4) is located in the first cavity (7). The sealing membrane (6) and the detection end of the dialysis machine pressure sensor (4) are in contact. The connecting pipe (3) is fixedly connected to a pressure monitoring branch pipe (9) at one end away from the protective cover body (1). The first cavity (7) is equipped with an automatic blocking component for automatically blocking blood from entering the first cavity (7).

2. The integrated blood line sensor and pressure protection structure of claim 1, wherein, The sealing membrane (6) is made of medical polyurethane membrane material and has a thickness of 0.1-0.3 mm.

3. The integrated blood line sensor and overpressure protection structure of claim 2, wherein, The connecting tube (3) is fixedly connected to the blood circuit tube with a reinforcing protrusion (5).

4. The one-piece blood line sensor and over-pressure protection structure of claim 3, wherein, The outer wall of the protective cover body (1) is provided with anti-slip texture; the inner diameter of the sleeve (2) is adapted to the outer diameter of the dialysis machine sensor.

5. The integrated blood line sensor and overpressure protection structure according to claim 4, wherein The protective cover body (1) is made of either medical PVC material or silicone material.

6. The integrated blood line sensor and pressure protection structure of claim 5, wherein, The sealing membrane (6) is seamlessly bonded to the inner wall of the cavity by ultrasonic welding.

7. The integrated blood line sensor and overpressure protection structure of claim 6, wherein, The automatic blocking assembly includes an elastic half-membrane (10) symmetrically fixed to the inner wall of the first cavity (7); The protective cover body (1) has symmetrically opened contact cavities (13) and channels inside the side wall. One end of each channel is connected to the first cavity (7), and the other end of each channel is connected to the adjacent contact cavity (13). Each channel is connected to a one-way valve (14). Pull wires (12) are fixedly connected to the side wall of the elastic half membrane (10). The end of the pull wires (12) away from the elastic half membrane (10) extends through the side wall of the first cavity (7) to the adjacent contact cavity (13) and is fixedly connected to the inner side wall of the contact cavity (13).

8. The one-piece blood line sensor and over-pressure protection structure of claim 7, wherein, The part of the pull cord (12) located in the contact cavity (13) is made of water-soluble material, and the part of the pull cord (12) located in the first cavity (7) is made of medical nylon material.

9. The one-piece blood line sensor and over-pressure protection structure of claim 8, wherein, The elastic half-membrane (10) is made of medical-grade silicone material.

10. The one-piece blood line sensor and over-pressure protection structure of claim 9, wherein, The water-soluble material is medical-grade cross-linked carboxymethyl cellulose sodium.

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