blood gas analyzer

Abstract

The present application relates to a kind of blood gas analyzers, including test card assembly and reagent pack assembly, test card assembly at least includes the test card main body with calibration liquid port, reagent pack assembly at least includes rotating switch assembly, liquid storage device, air inlet device and sample inlet device with liquid inlet needle, rotating switch assembly includes the fixed valve body with first pipe mouth with liquid storage device communication, second pipe mouth with sample inlet device communication, third pipe mouth with air inlet device communication, and rotating main body with communication pipeline is set, both ends of liquid inlet needle are respectively communicated with second pipe mouth and calibration liquid port, rotating main body is set in fixed valve body inside and can be rotated relative to fixed valve body to realize first pipe mouth and second pipe mouth communication, or second pipe mouth and third pipe mouth communication, or close second pipe mouth.This blood gas analyzer uses rotating switch assembly to realize the on-off control of different pipeline, without pressing and relaxing rubber tube action, there is no pipeline blockage hidden trouble, prevent calibration liquid from leaking.

Description

[0001] This application is a divisional application of Chinese Patent No. CN201610207561.8, filed on March 31, 2016. Technical Field

[0002] This invention relates to the field of medical technology, and in particular to a blood gas analyzer. Background Technology

[0003] Blood gas analyzers are commonly used medical devices. They contain a reagent kit containing calibration solution for calibrating the electrodes being tested. To ensure the stability of the calibration solution, it must be well-sealed. Commercially available reagent kits mainly consist of a housing, tubing, and a tubing valve. The tubing valve can be inserted around the housing assembly point, causing the hook to engage with the locking hole. The housing and valve then compress the tubing, shutting it off. Releasing the hook releases the pressure, allowing the tubing to open and close. While this method allows for tubing on / off control, it has the following drawbacks: During transportation and storage, the tubing needs constant pressure from the valve to prevent calibration solution leakage. This prolonged pressure can cause the tubing to stick together and become blocked; the valve's compression action is unreliable, potentially leading to leakage due to incomplete compression of the tubing cross-section. Summary of the Invention

[0004] The purpose of this invention is to provide a blood gas analyzer that can avoid pipe blockage and liquid leakage.

[0005] To achieve the objective of this invention, the technical solution adopted is as follows:

[0006] A blood gas analyzer includes a test card assembly and a reagent kit assembly. The test card assembly includes at least a test card body with a calibration liquid port. The reagent kit assembly includes at least a rotary switch assembly, a liquid storage device, an air inlet device, and a sample injection device with an inlet needle. The rotary switch assembly includes a fixed valve body with a first port connected to the liquid storage device, a second port connected to the sample injection device, and a third port connected to the air inlet device, and a rotating body with a connecting pipe. The two ends of the inlet needle are connected to the second port and the calibration liquid port, respectively. The rotating body is disposed inside the fixed valve body and can rotate relative to the fixed valve body to realize the connection between the first port and the second port, or the connection between the second port and the third port, or to close the second port.

[0007] When the rotary switch assembly is in the state where the first and second ports are connected, the liquid storage device is connected to the sample injection device, allowing for the extraction of calibration solution. When the rotary switch assembly is in the state where the second and third ports are connected, the sample injection device is connected to the air intake device, allowing for air extraction. When the rotary switch assembly is in the state where the second port is closed, the second port is sealed, i.e., the sample injection device is closed, allowing the test card to extract test solution. This blood gas analyzer uses the rotary switch assembly to control the on / off state of different pipes, eliminating the need for tightening and loosening the tubing and preventing pipe blockage. Furthermore, when the rotary switch assembly is in the third state, the first port is effectively sealed, preventing calibration solution leakage.

[0008] The technical solution is further explained below:

[0009] Furthermore, the test card body also includes liquid pipelines, an inlet, and an electrode circuit board. The liquid pipelines include a test solution pipeline, a calibration solution pipeline, and an electrode pipeline connected to the electrode circuit board. One end of the test solution pipeline is connected to the inlet, and the other end is connected to the calibration solution pipeline and the electrode pipeline. The end of the calibration solution pipeline furthest from the test solution pipeline is connected to the calibration solution outlet. The highest point of the calibration solution pipeline is higher than the surface of the test solution. After the test is completed, the calibration solution outlet detaches from the reagent pack assembly, and the test solution is stored in the electrode pipeline and the calibration solution pipeline. Because the highest point of the calibration solution pipeline is higher than the surface of the test solution, the test solution cannot flow past the highest point of the calibration solution pipeline without external force, preventing liquid leakage from the calibration solution outlet and preventing liquid contamination. Compared with traditional blood gas analyzers, the calibration solution outlet of this invention does not require a sealing plug. The reagent pack assembly is directly connected to the calibration solution outlet, eliminating the problem of debris generated due to puncturing the sealing plug and eliminating the risk of debris contaminating the electrode and causing test failure.

[0010] Furthermore, a leak-proof groove with an upward-facing opening is recessed at the highest point of the calibration solution pipeline. The cross-sectional difference between the leak-proof groove and the calibration solution pipeline prevents the test solution from flowing out of the leak-proof groove due to its own surface tension, further preventing leakage from the calibration solution outlet.

[0011] Furthermore, the test card body also includes a liquid pipeline, a sample inlet, an exhaust port, and an electrode circuit board. The liquid pipeline includes a test liquid pipeline, a waste liquid chamber, and an electrode pipeline connected to the electrode circuit board. Both ends of the test liquid pipeline are connected to the sample inlet and the electrode pipeline, respectively. The end of the electrode pipeline furthest from the test liquid pipeline is connected to the inlet of the waste liquid chamber. The outlet of the waste liquid chamber is connected to the exhaust port, which is located above the inlet. After the test is completed, the exhaust port is disconnected from the external device, and the calibration solution is stored in the waste liquid chamber. Because the outlet of the waste liquid chamber is located above the inlet, the calibration solution cannot flow out from the outlet without external force. Therefore, the exhaust port connected to the outlet will not leak liquid, preventing liquid contamination. Compared with traditional blood gas analyzers, the exhaust port of this invention does not require a sealing plug. The external device is directly connected to the exhaust port, eliminating the problem of debris generated due to puncturing the sealing plug and eliminating the risk of debris contaminating the electrode and causing test failure.

[0012] Furthermore, the waste liquid chamber includes at least a first waste liquid chamber and a second waste liquid chamber arranged side by side, and a drain port connecting the first and second waste liquid chambers. The bottom of the first waste liquid chamber has an inlet, and the top of the second waste liquid chamber has an outlet, with the drain port located near the outlet. After testing, the calibration solution is stored in the first waste liquid chamber. The drain port is located between the first and second waste liquid chambers, near the outlet, and connects to the top of both chambers. A cross-sectional difference exists between the drain port and the waste liquid chambers, preventing the calibration solution from flowing from the first waste liquid chamber into the second waste liquid chamber due to its own surface tension, further preventing liquid leakage from the extraction port.

[0013] Furthermore, support columns are installed in both the first and second waste liquid chambers. These support columns prevent the sealing membrane on the test card from sinking into the waste liquid chamber when air is drawn through the extraction port.

[0014] Furthermore, the blood gas analyzer also includes a test valve assembly with a pressure-retaining element. The test card body also has a liquid pipeline. The test card assembly includes a sealing membrane to close the liquid pipeline. The sealing membrane is an elastic composite membrane. A valve groove is provided on the opposite side of the liquid pipeline and the sealing membrane. The sealing membrane is located between the valve groove and the pressure-retaining element, which has a pressure head that matches the shape of the valve groove. When the pressure-retaining element squeezes the sealing membrane to adhere to the valve groove, the test liquid pipeline is closed. The sealing membrane is an elastic composite membrane. When the pressure-retaining element leaves the sealing membrane, the sealing membrane moves away from the valve groove due to its own elastic deformation, and the test liquid pipeline is opened. The valve groove is set in the test liquid pipeline and forms an integral part with the test liquid pipeline, eliminating unnecessary cavities and residual air bubbles. It also reduces the amount of test liquid used and improves test accuracy. The test card body does not need to have a switch plug or a sealing membrane to cover the channel switch plug, avoiding air leakage problems, reducing the number of parts, facilitating production, and reducing product defect rate.

[0015] Furthermore, the bottom of the valve groove has a protrusion that faces the sealing membrane. When the sealing membrane is filled into the valve groove, the protrusion is embedded in the sealing membrane, resulting in a better seal in the test liquid pipeline.

[0016] Furthermore, the test valve assembly also includes a first drive device that drives the pressure member to reciprocate toward one side of the valve groove.

[0017] Furthermore, the fixed valve body and the rotating main body are interference-fitted. The sealing of the pipeline is achieved by utilizing the wall surface of the rotating main body, demonstrating an ingenious structural design.

[0018] Furthermore, the blood gas analyzer also includes a reagent pack valve control assembly, which further includes a rotating cover fitted onto the rotating body and a second drive device for rotating the rotating cover. The second drive device drives the rotating cover and the rotating body to rotate, and a rotary switch assembly is used to control the on / off state of different pipelines.

[0019] Furthermore, the test card body also includes an inlet, an exhaust port, an electrode circuit board, and liquid pipelines. The liquid pipelines include a test liquid pipeline, a calibration liquid pipeline, a waste liquid chamber, and an electrode pipeline connected to the electrode circuit board. One end of the test liquid pipeline is connected to the inlet, and the other end is connected to the calibration liquid pipeline and the electrode pipeline. The end of the calibration liquid pipeline furthest from the test liquid pipeline is connected to the calibration liquid outlet, and the highest point of the calibration liquid pipeline is higher than the test liquid surface. The end of the electrode pipeline furthest from the test liquid pipeline is connected to the inlet of the waste liquid chamber, and the outlet of the waste liquid chamber is connected to the exhaust port, located above the inlet. Without external force, the test liquid cannot flow past the highest point of the calibration liquid pipeline, and the calibration liquid cannot flow out from the outlet of the waste liquid chamber, preventing liquid from flowing out from the calibration liquid outlet and the exhaust port connected to the outlet, thus preventing liquid contamination.

[0020] Furthermore, the blood gas analyzer also includes a test valve assembly with a pressure-retaining component. The test card body also includes a sample inlet, an electrode circuit board, and a liquid pipeline. The test card assembly also includes a sealing membrane that seals the liquid pipeline. A valve groove is located on the opposite side of the liquid pipeline and the sealing membrane. The sealing membrane is situated between the valve groove and the pressure-retaining component, which has a pressure head that matches the shape of the valve groove. The liquid pipeline includes a test liquid pipeline, a calibration liquid pipeline, and an electrode pipeline connected to the electrode circuit board. One end of the test liquid pipeline is connected to the sample inlet, and the other end is connected to the calibration liquid pipeline and the electrode pipeline. The end of the calibration liquid pipeline furthest from the test liquid pipeline is connected to the calibration liquid outlet. The highest point of the calibration liquid pipeline is higher than the test liquid level. This prevents liquid from flowing out of the calibration liquid outlet and avoids air leakage, improving the accuracy of the blood gas analyzer test.

[0021] Furthermore, the blood gas analyzer also includes a test valve assembly with a pressure-retaining component. The test card body also includes a sample inlet, an exhaust port, an electrode circuit board, and a liquid pipeline. The test card assembly also includes a sealing membrane that seals the liquid pipeline. A valve groove is located on the opposite side of the liquid pipeline and the sealing membrane. The sealing membrane is located between the valve groove and the pressure-retaining component, which has a pressure head that matches the shape of the valve groove. The liquid pipeline includes a test liquid pipeline, a waste liquid chamber, and an electrode pipeline connected to the electrode circuit board. Both ends of the test liquid pipeline are connected to the sample inlet and the electrode pipeline, respectively. The end of the electrode pipeline furthest from the test liquid pipeline is connected to the inlet of the waste liquid chamber. The outlet of the waste liquid chamber is connected to the exhaust port, and the outlet is located above the inlet. This prevents liquid from flowing out of the exhaust port and avoids air leakage, improving the accuracy of the blood gas analyzer test.

[0022] Furthermore, the liquid pipeline includes a calibration solution pipeline, and one end of the test solution pipeline connected to the electrode pipeline is also connected to both the calibration solution pipeline and the electrode pipeline. The end of the calibration solution pipeline furthest from the test solution pipeline is connected to the calibration solution outlet, and the highest point of the calibration solution pipeline is higher than the surface of the test solution. This prevents liquid from flowing out of the suction port and the calibration solution outlet, avoids air leakage, and improves the accuracy of the blood gas analyzer test.

[0023] Furthermore, the blood gas analyzer also includes a piston pump assembly, and the test card body is equipped with an air extraction port. The piston pump assembly includes an extraction needle connected to the air extraction port at one end, a connector connected to the extraction needle, a piston connected to the connector, and a third drive device that drives the piston to perform linear reciprocating motion. During the test, the third drive device drives the piston to retract, creating negative pressure in the liquid pipeline inside the test card body, allowing calibration solution, air, or test solution to enter the liquid pipeline, thus completing the extraction of each medium.

[0024] Furthermore, the blood gas analyzer also includes a sealing element, which is fitted onto the inlet needle and the suction needle. The outer wall of the test card body has a sealing groove that matches the shape of the sealing element. This improves the effectiveness of the blood gas analyzer in preventing liquid leakage. Compared with traditional blood gas analyzers, the sealing element seals the inlet needle and the suction needle respectively. After the reagent pack assembly and the piston pump assembly are separated from the test card body, the potential for test failure due to debris contamination of the electrodes is avoided while ensuring a tight seal.

[0025] Furthermore, the blood gas analyzer also includes a sliding assembly, which is positioned opposite the test card body and located on the side of the test card body facing the electrode circuit board. The sliding assembly includes a slider, a first fixing seat, and first compression springs at both ends that abut against the slider and the fixing seat, respectively. The slider has a first plug protruding towards the test card body, and the test card body has a first limiting groove that mates with the first plug. After the test card assembly is inserted into the reagent pack assembly, the slider, under the action of the first compression spring, causes the first plug on the slider to insert into the first limiting groove, thereby positioning the test card body.

[0026] Furthermore, the blood gas analyzer also includes a heating component, and the test card body is equipped with an electrode circuit board. The heating component is positioned opposite the test card body and located on the side of the test card body facing away from the electrode circuit board. The heating component includes a first heating element positioned opposite the electrode circuit board, a heating element fixing bracket fixed to the first heating element, and a fourth driving device that drives the heating element fixing bracket to reciprocate towards the electrode circuit board. The heating element fixing bracket has a second plug protruding towards the test card body, and the test card body has a second limiting groove that mates with the second plug. After the test card component is inserted into the reagent pack component, the slider, under the action of the first compression spring, causes the first plug on the slider to insert into the first limiting groove, achieving initial positioning of the test card body. Under the action of the fourth driving device, the second plug moves towards the test card body and inserts into the second limiting groove, achieving secondary positioning of the test card body, making the positioning of the test card body more accurate and reliable. The first heating element heats the liquid inside the test card body, bringing the liquid to a specified temperature. The sliding fastener and heating assembly provide dual-sided positioning for the front and back of the test card body, ensuring that the test card body is subjected to uniform force and will not deform under stress.

[0027] Furthermore, the blood gas analyzer also includes a pop-up assembly located directly below the test card body. This assembly includes a second fixing seat, a pressing block positioned opposite the bottom of the test card body, and second compression springs at both ends that abut against the second fixing seat and the pressing block, respectively. After the test card assembly is inserted into the reagent pack assembly, the sliding fastener assembly and the heating assembly fix the test card body in place, the pressing block is pressed down, and the second compression spring is compressed. When the test is completed, the sliding fastener assembly and the heating assembly release the fixation of the test card body, and the pressing block springs back upward under the action of the second compression spring, thus automatically popping the test card body up.

[0028] Furthermore, the blood gas analyzer also includes a testing component, which is positioned opposite to the test card body and located on the side of the test card body facing the electrode circuit board. The testing component includes a detection module, a second heating element positioned opposite to the electrode circuit board, a housing with the detection module and the second heating element fixed thereon, and a fifth driving device that drives the housing to reciprocate toward the electrode circuit board. A slider is located above the housing, and a mating rib protrudes from the bottom of the slider toward one side of the housing. A pushing rib protrudes from the top of the housing toward one side of the slider, and the pushing rib is located between the mating rib and the test card body. After the test card assembly is inserted into the reagent pack assembly, the fifth driving device drives the second heating element on the housing to move towards the electrode circuit board. The first plug is inserted into the first limiting groove, and the second plug is inserted into the second limiting groove. After the test assembly is powered on, it heats the electrode circuit board, so that the liquid in the test card body reaches the specified temperature. The current and voltage signals generated on the electrode circuit board are transmitted to the host through the detection module to realize the testing of the calibration solution and the test solution. After the test is completed, the fifth driving device of the test assembly drives the housing to retract. Since the pushing rib is located between the mating rib and the test card body, when the pushing rib on the housing contacts the mating rib, the pushing rib continues to retract with the housing, and the slider retracts with the pushing rib. The first compression spring is compressed, and the first plug on the slider is disengaged from the first limiting groove. After the test card body automatically pops up, the fifth drive device moves the housing forward, and the slider also moves forward under the action of the first compression spring. The mating rib squeezes the pushing rib. When the housing moves to the point where there is no force between the pushing rib and the mating rib, the first plug of the sliding buckle assembly returns to the initial position, which facilitates the next round of testing. The clever design of the mating rib and the pushing rib structure realizes the position control of the sliding buckle assembly by the test assembly, making the action more reliable.

[0029] Furthermore, the blood gas analyzer also includes a reagent pack valve control assembly, a piston pump assembly, a heating assembly, and a testing assembly. The testing valve assembly includes a first driving device that drives the pressure member to reciprocate towards the valve slot. The reagent pack valve control assembly includes a rotating cover fitted onto the rotating body and a second driving device that drives the rotating cover to rotate. The piston pump assembly includes a suction needle with one end connected to the suction port, a connector connected to the suction needle, a piston connected to the connector, and a third driving device that drives the piston to reciprocate linearly. The heating assembly includes a first heating element disposed opposite to the electrode circuit board, a heating element fixing bracket fixed to the first heating element, and a fourth driving device that drives the heating element fixing bracket to reciprocate towards the electrode circuit board. The testing assembly includes a detection module, a second heating element disposed opposite to the electrode circuit board, a housing fixed to the detection module and the second heating element, and a fifth driving device that drives the housing to reciprocate towards the electrode circuit board. The test valve assembly, reagent pack valve control assembly, piston pump assembly, heating assembly, and test assembly are all controlled by independent drive devices. Compared with the traditional rotary synchronous drive system of blood gas analyzers, the control of blood gas analyzers is more flexible and the working cycle is shortened.

[0030] Furthermore, the first, third, fourth, and fifth drive devices are linear stepper motors, while the second drive device is a rotary stepper motor. Since all five drive devices are stepper motors, compared to the traditional rotary synchronous drive system of blood gas analyzers, stepper motors offer adjustable speed, smooth and controllable movement, low noise, simplified structure, and improved assembly efficiency.

[0031] Furthermore, the first, second, third, fourth, and fifth drive units are all equipped with reset optocouplers. These reset optocouplers detect the initial position of the motor shaft, eliminating positional errors after each movement and making control more precise.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] When the rotary switch assembly is in the state where the first and second ports are connected, the liquid storage device is connected to the sample injection device, allowing for the extraction of calibration solution. When the rotary switch assembly is in the state where the second and third ports are connected, the sample injection device is connected to the air intake device, allowing for air extraction. When the rotary switch assembly is in the state where the second port is closed, the second port is sealed, i.e., the sample injection device is closed, allowing the test card to extract test solution. This blood gas analyzer uses the rotary switch assembly to control the on / off state of different pipes, eliminating the need for tightening and loosening the tubing and preventing pipe blockage. Furthermore, when the rotary switch assembly is in the third state, the first port is effectively sealed, preventing calibration solution leakage. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the blood gas analyzer according to an embodiment of the present invention;

[0035] Figure 2 This is an explosion diagram of the blood gas analyzer according to an embodiment of the present invention;

[0036] Figure 3 This is a schematic diagram showing the connection between the test card assembly and the reagent pack assembly according to an embodiment of the present invention;

[0037] Figure 4 This is a schematic diagram of the structure of the reagent package component according to an embodiment of the present invention;

[0038] Figure 5 This is an exploded view of the reagent package assembly according to an embodiment of the present invention;

[0039] Figure 6 This is a schematic diagram showing the connection between the reagent package assembly and the reagent package valve control assembly according to an embodiment of the present invention;

[0040] Figure 7 This is a schematic diagram of the piston pump assembly according to an embodiment of the present invention;

[0041] Figure 8 This is a schematic diagram of the structure of the test card assembly according to an embodiment of the present invention;

[0042] Figure 9 This is an exploded view of the test card assembly according to an embodiment of the present invention;

[0043] Figure 10 for Figure 8 Sectional view along the AA direction;

[0044] Figure 11 for Figure 10 Enlarged view of point I;

[0045] Figure 12 This is a schematic diagram of the structure of the test valve assembly according to an embodiment of the present invention;

[0046] Figure 13 This is a schematic diagram of the first working state of the test card component according to an embodiment of the present invention;

[0047] Figure 14 This is a schematic diagram of the second working state of the test card component according to an embodiment of the present invention;

[0048] Figure 15 This is a schematic diagram of the third working state of the test card component according to an embodiment of the present invention;

[0049] Figure 16 for Figure 1 Enlarged view of section II;

[0050] Figure 17 for Figure 1 Enlarged view of section III;

[0051] Figure 18 This is a schematic diagram showing the connection of the test card assembly, heating assembly, and test assembly according to an embodiment of the present invention;

[0052] Figure 19 for Figure 18 Enlarged view of point IV;

[0053] Figure 20 This is a schematic diagram of the structure of the heating assembly according to an embodiment of the present invention;

[0054] Figure 21 This is a schematic diagram of the structure of the test component in an embodiment of the present invention;

[0055] Figure 22 for Figure 4 Enlarged image of V.

[0056] Explanation of reference numerals in the attached figures:

[0057] 10. Test card assembly, 110. Test card body, 111. Sample inlet, 112. Calibration solution inlet, 113. Vacuum outlet, 114. Sealing groove, 115. Electrode test groove, 116. First limiting groove, 117. Second limiting groove, 120. Sealing membrane, 121. Adhesive film, 122. Elastic silicone film, 123. PET film, 130. Electrode circuit board, 140. Liquid pipeline, 141. Test solution pipeline, 1411. Valve groove, 142. Calibration solution pipeline, 1421. Leak-proof groove, 1422. Top, 143. Waste liquid chamber, 1431. First waste liquid chamber, 1432. Second waste liquid chamber, 1433. Drain outlet, 1434. Inlet, 1435. Outlet 144. Electrode conduit, 145. Waste liquid conduit, 150. Seal, 160. Support column, 170. Injection needle, 180. Syringe, 190. Protrusion, 20. Reagent pack assembly, 210. Rotary switch assembly, 211. Fixed valve body, 212. Rotating body, 213. Connecting pipe, 214. First port, 215. Second port, 216. Third port, 220. Liquid storage device, 221. Liquid outlet pipe, 230. Gas inlet device, 240. Injection device, 241. Injection needle, 242. Injection pipe, 250. Outer shell, 251. Front shell, 252. Rear shell, 260. Rotary handle, 270. Support base, 30. Reagent pack valve control assembly Components, 310. Rotating cover, 320. Second drive unit, 321. First motor shaft, 330. First optocoupler, 40. Piston pump assembly, 410. Suction needle, 420. Suction pipe, 430. Connector, 440. Piston, 450. Third drive unit, 451. Second motor shaft, 460. Second optocoupler, 470. First fixed bracket, 480. Pump body, 50. Test valve assembly, 510. Pressing element, 511. Press head, 520. First drive unit, 521. Third motor shaft, 530. Third optocoupler, 60. Sliding buckle assembly, 610. Slider, 611. First plug, 612. Mating rib, 620. First fixed base, 630. First compression spring 640. First guide shaft, 70. Heating assembly, 710. First heating element, 720. Heating element fixing bracket, 721. Second plug, 730. Fourth drive device, 731. Fourth motor shaft, 740. Fourth optocoupler, 750. Heating element fixing cover, 760. Motor fixing bracket, 770. Second guide shaft, 780. Buckle, 80. Spring-up assembly, 810. Second fixing seat, 820. Pressing block, 830. Second compression spring, 90. Test assembly, 910. Detection module, 911. Test probe, 920. Second heating element, 930. Housing, 931. Push rib, 940. Fifth drive device, 941. Fifth motor shaft, 950. Fifth optocoupler. Detailed Implementation

[0058] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings:

[0059] like Figures 1 to 4 , Figure 9 , Figure 22 As shown, a blood gas analyzer includes a test card assembly 10 and a reagent pack assembly 20. The test card assembly 10 includes a test card body 110 with an inlet 111, a calibration liquid inlet 112, an exhaust port 113, and a liquid pipeline 140; a sealing membrane 120 sealing the liquid pipeline 140; and an electrode circuit board 130 disposed on the test card body 110. The reagent pack assembly 20 includes at least a rotary switch assembly 210, a liquid storage device 220, an air inlet device 230, and an inlet device 240 with an inlet needle 241. The rotary switch assembly 210 includes a fixed valve body 211 and a rotating body 212. The rotating body 212 is disposed inside the fixed valve body 211 and can rotate relative to the fixed valve body 211. The rotating body 212 is provided with a connecting pipe 213. The fixed valve body 211 is provided with a first port 214 connected to the liquid storage device 220, a second port 215 connected to the sample injection device 240, and a third port 216 connected to the air inlet device 230. The two ends of the liquid injection needle 241 are connected to the second port 215 and the calibration liquid port 112, respectively. Rotating the rotating body 212 can put the rotary switch assembly 210 into a first state, a second state, or a third state: the first state is that the second port 215 and the first port 214 are connected through the connecting pipe 213; the second state is that the second port 215 and the third port 216 are connected through the connecting pipe 213; the third state is that both the second port 215 and the first port 214 are closed.

[0060] When the rotary switch assembly 210 is in the first state, the liquid storage device 220 is connected to the sample injection device 240, allowing for the extraction of calibration solution. When the rotary switch assembly 210 is in the second state, the sample injection device 240 is connected to the air intake device 230, allowing for air extraction. When the rotary switch assembly 210 is in the third state, the second port 215 is closed, i.e., the sample injection device 240 is closed, allowing the test card to extract test solution. This blood gas analyzer uses the rotary switch assembly 210 to control the opening and closing of different pipes, eliminating the need for tightening and loosening the tubing and preventing pipe blockage. Simultaneously, when the rotary switch assembly 210 is in the third state, the first port 214 is effectively closed, preventing calibration solution leakage. Preferably, the fixed valve body 211 and the rotating body 212 are interference-fitted, directly utilizing the wall surface of the rotating body 212 to achieve pipe closure.

[0061] In this embodiment, as Figure 4 , Figure 5 and Figure 22As shown, the reagent kit assembly 20 also includes a housing 250 with a placement cavity, a fixed valve body 211 fixed inside the placement cavity, and an L-shaped connecting pipe 213. The housing 250 is equipped with a rotating handle 260 connected to the rotating body 212, and the rotating handle 260 is exposed on the housing 250. During use, rotating the rotating handle 260 adjusts the rotary switch assembly 210 to different states, making it convenient to use. The connecting pipe 213 can also be configured in other shapes according to actual needs.

[0062] like Figure 4 and Figure 5 As shown, the liquid storage device 220 is a calibration solution bag placed inside the placement cavity. The outer shell 250 protects the calibration solution bag from contamination. The calibration solution bag is provided with a liquid outlet tube 221, which is fitted onto the first port 214. The outer shell 250 includes a front shell 251 and a rear shell 252, which are detachably connected for easy installation of the calibration solution bag.

[0063] In this embodiment, the front shell 251 and the rear shell are fixed by screws. A status indicator (not shown in the figure) is provided on the outer shell 250 near the rotary handle 260 to help the user understand the current status of the rotary switch assembly 210.

[0064] like Figure 2 and Figure 6 As shown, the blood gas analyzer also includes a reagent pack valve control assembly 30, which further includes a rotating cover 310 sleeved on the rotating body 212 and a second drive device 320 for driving the rotating cover 310 to rotate. The second drive device 320 drives the rotating cover 310 and the rotating body 212 to achieve rotational movement, and the rotary switch assembly 210 is used to control the on / off state of different pipelines.

[0065] In this embodiment, the second driving device 320 is a rotary stepper motor, which has a first motor shaft 321. The rotating cover 310 is designed with an optocoupler sensing wall (not shown in the figure), and the rotating cover 310 is fixed to the first motor shaft 321 by screws. When the rotary stepper motor is powered on, the first motor shaft 321 drives the rotating cover 310 and the rotating body 212 to rotate, thereby realizing the on / off control of the sample inlet liquid path and the gas inlet pipe of the reagent package assembly 20.

[0066] The reagent package valve control assembly 30 also includes a first optocoupler 330, which detects and controls the initial position of the first motor shaft 321 to eliminate position errors after each rotation.

[0067] like Figure 4 and Figure 22As shown, the reagent kit assembly 20 also includes a support base 270, which is fixed to the outer shell 250. The sample injection device 240 includes an injection needle 241 and an injection tube 242. The injection needle 241 is fixed to the support base 270 and connected to the calibration port 112 of the test card for easy sample delivery. One end of the injection tube 242 is fitted onto the injection needle 241, and the other end is fitted onto the second port 215. The injection needle 241 is connected to the second port 215 through the injection tube 242. The air intake device 230 is an air tube fitted onto the third port 216. The air tube is connected to the atmosphere and directly draws air from the atmosphere.

[0068] like Figure 3 , Figure 4 and Figure 7 As shown, the blood gas analyzer also includes a piston pump assembly 40. The piston pump assembly 40 includes a suction needle 410 with one end connected to the suction port 113, a suction tube 420 with one end connected to the other end of the suction needle 410, a connector 430 connected to the other end of the suction tube 420, a piston 440 connected to the connector 430, and a third drive device 450 that drives the piston 440 to perform linear reciprocating motion. The suction needle 410 and the suction tube 420 are fixed on the support base 270 of the reagent pack assembly 20. During the test, the third drive device 450 drives the piston 440 to retract, creating a negative pressure in the liquid pipeline 140 inside the test card body 110, allowing calibration solution, air, or test solution to enter the liquid pipeline 140, thus completing the extraction of each medium.

[0069] In this embodiment, the third drive device 450 is a linear stepper motor, which has a second motor shaft 451. The piston pump assembly 40 also includes a piston pump sub-assembly with a piston 440 and a connector 430, a second optocoupler 460, and a first fixed bracket 470. The piston pump assembly also includes a pump body 480. The piston pump assembly is fitted into the first fixed bracket 470, wherein the piston 440 is threadedly connected to the second motor shaft 451. The third drive device 450 is fixed to the first fixed bracket 470 by screws, which also fixes the piston pump assembly. When the third drive device 450 is powered on, the second motor shaft 451 drives the piston 440 to reciprocate along the pump body 480. The second optocoupler 460 detects the initial position of the second motor shaft 451 and eliminates positional errors after each reciprocating motion.

[0070] like Figure 3As shown, the blood gas analyzer also includes a sealing element 150, which is fitted onto the inlet needle 241 and the suction needle 410. The outer wall of the test card body 110 is provided with a sealing groove 114 that matches the shape of the sealing element 150. This improves the effectiveness of the blood gas analyzer in preventing liquid leakage. Compared with traditional blood gas analyzers, the sealing element 150 seals the inlet needle 241 and the suction needle 410 respectively. After the reagent pack assembly 20 and the piston pump assembly 40 are separated from the test card body 110, the potential for test failure due to debris contamination of the electrodes is avoided while ensuring a tight seal.

[0071] like Figure 8 and Figure 9 As shown, the liquid pipeline 140 of the test card assembly 10 includes a test liquid pipeline 141, a calibration liquid pipeline 142, a waste liquid chamber 143, and an electrode pipeline 144 connected to the electrode circuit board 130. One end of the test liquid pipeline 141 is connected to the sample inlet 111, and the other end is connected to the calibration liquid pipeline 142 and the electrode pipeline 140. The end of the calibration liquid pipeline 142 away from the test liquid pipeline 141 is connected to the calibration liquid inlet 112. The end of the electrode pipeline 140 away from the test liquid pipeline 141 is connected to the inlet 1434 of the waste liquid chamber 143. The outlet 1435 of the waste liquid chamber 143 is connected to the air extraction port 113. The outlet 1435 is located above the inlet 1434. The highest point of the calibration liquid pipeline 142 is higher than the surface of the test liquid. After the test is completed, the suction port 113 and the calibration liquid port 112 are detached from the reagent pack assembly 20. The calibration liquid is stored in the waste liquid chamber 143, and the test liquid is stored in the electrode pipe 140 and the calibration liquid pipe 142. Since the outlet 1435 of the waste liquid chamber 143 is located above the inlet 1434, the calibration liquid cannot flow out from the outlet 1435 without external force. Therefore, the suction port 113 connected to the outlet 1435 will not leak liquid, preventing liquid contamination. Furthermore, the highest liquid level in the calibration liquid pipe 142, i.e., the top 1422 of the pipe, is higher than the liquid level of the test liquid. Without external force, the test liquid cannot flow past the highest liquid level in the calibration liquid pipe 142, and the liquid will not leak from the calibration liquid port 112, preventing liquid contamination. Compared with traditional test cards, the calibration liquid port 112 and the air extraction port 113 of this invention do not require sealing plugs. External devices are directly connected to the calibration liquid port 112 and the air extraction port 113, eliminating the problem of debris generated due to puncturing the sealing plug and eliminating the hidden danger of debris contaminating the electrode and causing test failure.

[0072] In this embodiment, the waste liquid chamber 143 includes a first waste liquid chamber 1431 and a second waste liquid chamber 1432 arranged side by side, and a drain port 1433 connecting the first waste liquid chamber 1431 and the second waste liquid chamber 1432. The bottom of the first waste liquid chamber 1431 is provided with a liquid inlet 1434, and the top of the second waste liquid chamber 1432 is provided with a liquid outlet 1435. The drain port 1433 is located on the side close to the liquid outlet 1435. After the test, the calibration solution is stored in the first waste liquid chamber 1431. A drain port 1433 is provided between the first waste liquid chamber 1431 and the second waste liquid chamber 1432. The drain port 1433 is located on the side near the outlet 1435 and connects to the top of the first waste liquid chamber 1431 and the second waste liquid chamber 1432. There is a cross-sectional difference between the drain port 1433 and the waste liquid chamber 143. Due to its own liquid surface tension, the calibration solution cannot easily flow from the first waste liquid chamber 1431 into the second waste liquid chamber 1432, further preventing liquid leakage from the vent 113. More than one waste liquid chamber 143 can be provided as needed.

[0073] like Figure 8 As shown, two support pillars 160 are provided in both the first waste liquid chamber 1431 and the second waste liquid chamber 1432. The support pillars 160 prevent the sealing membrane 120 on the test card from sinking into the waste liquid chamber 143 when air is drawn through the extraction port 113. The first waste liquid chamber 1431 and the second waste liquid chamber 1432 may also be equipped with more than one support pillar 160 as needed.

[0074] like Figure 8 As shown, the liquid pipeline 140 also includes a waste liquid pipeline 145, and the waste liquid pipeline 145 is connected between the liquid outlet 1435 and the air extraction port 113.

[0075] like Figure 8 As shown, the top 1422 of the calibration fluid pipeline 142 is recessed with an upward-facing anti-leakage groove 1421. There is a cross-sectional difference between the anti-leakage groove 1421 and the calibration fluid pipeline 142, preventing the test fluid from flowing out of the anti-leakage groove 1421 due to its own liquid surface tension, further preventing leakage from the calibration fluid port 112. The anti-leakage groove 1421 can also be installed between the top 1422 of the calibration fluid pipeline 142 and the end where the calibration fluid pipeline 142 connects to the test fluid pipeline 141, depending on actual needs.

[0076] like Figure 10 As shown, the test card body 110 is also provided with an electrode test slot 115, and the bottom of the electrode pipe 140 is connected to the electrode circuit board 130 through the electrode test slot 115.

[0077] like Figure 8As shown, the test card assembly 10 also includes a sample injection needle 170, and a liquid injection needle 241 is fixed to the sample injection port 111 of the test card body 110 and communicates with the syringe 180, and the test liquid is stored in the syringe 180.

[0078] like Figure 2 , Figure 8 , Figure 9 and Figure 12 As shown, the blood gas analyzer also includes a test valve assembly 50 with a pressure member 510. The sealing membrane 120 is an elastic composite membrane. A valve groove 1411 is provided on the opposite side of the test fluid pipeline 141 and the sealing membrane 120. The sealing membrane 120 is located between the valve groove 1411 and the pressure member 510. The pressure member 510 is provided with a pressure head 511 that matches the shape of the valve groove 1411. When the pressure member 510 squeezes the sealing membrane 120 to adhere to the valve groove 1411, the test fluid pipeline 141 is closed. The sealing membrane 120 is an elastic composite membrane. When the pressure member leaves the sealing membrane 120, the sealing membrane 120 moves away from the valve groove 1411 due to its own elastic deformation, and the test fluid pipeline 141 is opened. The valve groove 1411 is set in the test liquid pipeline 141 and is integrated with the test liquid pipeline 141. There are no extra cavities and no residual air bubbles. At the same time, the amount of test liquid used is reduced and the test accuracy is improved. The test card body 110 does not need to be equipped with a switch plug and a sealing membrane 120 for covering the channel switch plug, which avoids air leakage, reduces the number of parts, facilitates production, and reduces the product defect rate.

[0079] In this embodiment, as Figure 12 As shown, the test valve assembly 50 also includes a first drive device 520 and a third optocoupler 530 that drive the pressing member 510 to reciprocate towards the valve groove 1411. The first drive device 520 is a linear stepper motor with a third motor shaft 521. The pressing member 510 is threaded onto the third motor shaft 521. When the first drive device 520 is energized, the third motor shaft 521 drives the pressing member 510 to reciprocate along the axial direction of the linear stepper motor. The third optocoupler 530 detects and controls the initial position of the third motor shaft 521, eliminating positional errors in each reciprocating motion.

[0080] like Figure 11 As shown, the bottom of the valve groove 1411 is provided with a protrusion 190 that protrudes towards the sealing membrane 120. The protrusion 190 is rib-shaped. When the sealing membrane 120 is filled into the valve groove 1411, the protrusion 190 is embedded in the sealing membrane 120, which makes the sealing effect of the test liquid pipeline 141 better.

[0081] In this embodiment, as Figure 11As shown, the sealing membrane 120 includes an adhesive film 121, an elastic silicone film 122, and a PET film 123. The adhesive film 121 is bonded between the test card body 110 and the elastic silicone film 122, and the PET film 123 covers the side of the elastic silicone film 122 facing away from the valve groove 1411. The adhesive film 121 serves to bond the sealing membrane 120 to the test card body 110, thus sealing all the channels of the test card. The elastic silicone film 122 provides a sealing function, filling the valve groove 1411 with its own elasticity. The PET film 123 provides support and reset, ensuring that the sealing membrane 120 effectively resets after the external force is removed while deforming. Furthermore, the sealing membrane 120 uses a flat and large-area application method to seal the liquid channels 140 within the entire test card, further preventing air leakage. The sealing membrane 120 can also adopt other structural forms according to actual needs.

[0082] The test card assembly 10, test valve assembly 50, reagent pack assembly 20, reagent pack valve control assembly 30, and piston pump assembly 40 constitute the liquid extraction subsystem of the blood gas analyzer. Before testing, the test card assembly 10 is inserted into the reagent pack assembly 20. The calibration port 112 of the test card body 110 is connected to the inlet needle 241 on the support base 270, and the suction port 113 of the test card body 110 is connected to the suction needle 410 on the support base 270 and sealed by the sealing element 150, thereby connecting the pipeline of the reagent pack assembly 20 with the pipeline of the test card assembly 10. The connector 430 of the piston pump assembly 40 is inserted into the suction tube 420 on the support base 270, and the suction tube 420 is connected to the suction needle 410, thereby connecting the pipeline of the piston pump assembly 40 with the pipeline of the test card assembly 10. The pressure member 510 of the test valve assembly 50 is installed at the valve groove 1411 position of the test liquid pipeline 141 to realize the on / off control of the test liquid pipeline 141.

[0083] During testing, first draw up the calibration solution: such as Figure 2 , Figure 3 and Figure 13As shown, when the second drive device 320 of the reagent package valve control assembly 30 is energized, the first motor shaft 321 drives the rotating cover 310 and the rotating body 212 to rotate, so that the L-shaped pipe in the rotating body 212 is connected to the first port 214 and the second port 215 of the reagent package assembly 20, respectively, thereby connecting to the calibration solution pipe 142 and the electrode test slot 115 of the test card assembly 10; when the first drive device 520 of the test valve assembly 50 is energized, the third motor shaft 521 drives the pressing member 510 to push forward, pressing the sealing membrane 120 into the valve slot 141 of the test solution pipe 141. On the 1st, the elastic silicone membrane 122 of the sealing membrane 120 fills the valve groove 1411, sealing the test liquid pipeline 141; the third drive device 450 of the piston pump assembly 40 is powered on, and the second motor shaft 451 drives the piston 440 to move backward, generating negative pressure in the liquid pipeline 140 of the test card assembly 10; under the action of negative pressure, the calibration solution in the liquid storage device 220 of the reagent package assembly 20 flows into the electrode test groove 115 through the rotating body 212, the liquid inlet pipe 242, the liquid inlet needle 241 and the calibration solution pipeline 142 of the test card assembly 10, completing the extraction of calibration solution.

[0084] Then extract the air: such as Figure 2 , Figure 3 and Figure 14 As shown, the second drive device 320 of the reagent package valve control assembly 30 is energized, and the first motor shaft 321 drives the rotating cover 310 and the rotating body 212 of the reagent package assembly 20 to rotate, so that the L-shaped pipe in the rotating body 212 is connected to the second port 215 and the third port 216 respectively, thereby connecting to the calibration solution pipe 142 and the electrode test slot 115 of the test card assembly 10; the first drive device 520 of the test valve assembly 50 remains energized, and the pressing member 510 still presses the sealing membrane 120 tightly in the valve slot 14. At step 11, the test liquid pipeline 141 is kept closed; the third drive device 450 of the piston pump assembly 40 is powered on, and the second motor shaft 451 drives the piston 440 to continue to move backward, so that a negative pressure is generated in the liquid pipeline 140 of the test card assembly 10; under the action of negative pressure, the outside air of the reagent pack assembly 20 enters the electrode test tank 115 through the third port 216, the rotating body 212, the second port 215, the liquid inlet pipe 242, the liquid inlet needle 241 and the calibration liquid pipeline 142 of the test card assembly 10, thus completing the air extraction.

[0085] Finally, extract the test solution: (e.g.) Figure 2 , Figure 3 and Figure 15As shown, when the second drive device 320 of the reagent package valve control assembly 30 is energized, the first motor shaft 321 drives the rotating cover 310 and the rotating body 212 of the reagent package assembly 20 to rotate, causing the L-shaped pipes inside the rotating body 212 to leave the first port 214 and the third port 216 respectively, that is, the liquid storage device 220 and the liquid inlet pipe 242 are sealed by the outer wall of the rotating body 212, thus closing the reagent package pipeline system; when the first drive device 520 of the test valve assembly 50 is energized, the pressure member 510 leaves the test liquid pipeline 141. The valve slot 1411, the sealing membrane 120 of the test card assembly 10 is elastically reset by the PET film 123, so that the test liquid pipeline 141 is opened; the third drive device 450 of the piston pump assembly 40 is powered on and the second motor shaft 451 drives the piston 440 to continue to move backward, so that negative pressure is generated in the liquid pipeline 140 of the test card assembly 10; under the action of negative pressure, the test liquid in the syringe 180 enters the electrode test slot 115 through the liquid inlet needle 241 of the test card assembly 10 and the test liquid pipeline 141, thus completing the extraction of the test liquid.

[0086] like Figure 1 , Figure 2 and Figure 16 As shown, the blood gas analyzer also includes a sliding fastener assembly 60, which is disposed opposite to the test card body 110 and located on the side of the test card body 110 facing the electrode circuit board 130. The sliding fastener assembly 60 includes a slider 610, a first fixing seat 620, a first compression spring 630 whose two ends respectively abut against the slider 610 and the fixing seat, and a first guide shaft 640 on which the first compression spring 630 is sleeved. One end of the first guide shaft 640 is connected to the first fixing seat 620, and the other end passes through the guide hole of the slider 610. The slider 610 is provided with a first plug 611 protruding towards one side of the test card body 110, and the side wall of the test card body 110 is recessed with a first limiting groove 116 that cooperates with the first plug 611. After the test card assembly 10 is inserted into the reagent pack assembly 20, the slider 610, under the action of the first compression spring 630, causes the first plug 611 on the slider 610 to be inserted into the first limiting groove 116, thereby positioning the test card body 110. The first guide shaft 640 plays a guiding role to prevent the slider 610 from shifting during movement.

[0087] like Figure 2 , Figures 17 to 20As shown, the blood gas analyzer also includes a heating assembly 70, which is disposed opposite to the test card body 110 and located on the side of the test card body 110 facing away from the electrode circuit board 130. The heating assembly 70 includes a first heating element 710 disposed opposite to the electrode circuit board 130, a heating element fixing bracket 720 on which the first heating element 710 is fixed, and a fourth driving device 730 for driving the heating element fixing bracket 720 to reciprocate toward the electrode circuit board 130. The heating element fixing bracket 720 is provided with a second plug 721 protruding toward the test card body 110, and a second limiting groove 117 that cooperates with the second plug 721 is recessed in the side wall of the test card body 110. After the test card assembly 10 is inserted into the reagent pack assembly 20, the slider 610, under the action of the first compression spring 630, causes the first plug 611 on the slider 610 to insert into the first limiting groove 116, achieving initial positioning of the test card body 110. Under the action of the fourth driving device 730, the second plug 721 moves to one side of the test card body 110 and inserts into the second limiting groove 117, achieving secondary positioning of the test card body 110, making the positioning of the test card body 110 more accurate and reliable. The first heating element 710 heats the liquid inside the test card body 110, bringing the liquid to a specified temperature. The sliding assembly 60 and the heating assembly 70 perform bilateral positioning of the front and back of the test card body 110, ensuring that the test card body 110 is subjected to uniform force and will not deform under stress.

[0088] In this embodiment, as Figure 20 As shown, the fourth drive device 730 is a linear stepper motor, which has a fourth motor shaft 731. The heating assembly 70 also includes a fourth optocoupler 740, a heating element fixing cover 750, a motor fixing bracket 760, and a second guide shaft 770 mounted on the motor fixing bracket 760. The heating element fixing bracket 720 and the heating element fixing cover 750 have mutually cooperating fasteners 780. The fourth drive device 730 is fixed to the motor fixing bracket 760 with screws. The heating element fixing bracket 720 is fitted onto the second guide shaft 770 of the motor fixing bracket 760 and threadedly connected to the fourth motor shaft 731. The first heating element 710 is fixed to the heating element fixing bracket 720 through the heating element fixing cover 750. When the fourth drive device 730 is powered on, the fourth motor shaft 731 drives the first heating element 710 to perform linear reciprocating motion along the direction of the second guide shaft 770. The fourth optocoupler 740 detects and controls the initial position of the fourth motor shaft 731, eliminating positional errors after each reciprocating motion.

[0089] like Figure 1 and Figure 2As shown, the blood gas analyzer also includes a pop-up assembly 80 located directly below the test card body 110. The pop-up assembly 80 includes a second fixing seat 810, a pressing block 820 disposed opposite to the bottom of the test card body 110, and a second compression spring 830 whose two ends respectively abut against the second fixing seat 810 and the pressing block 820. After the test card assembly 10 is inserted into the reagent pack assembly 20, the sliding fastener assembly 60 and the heating assembly 70 fix and position the test card body 110, the pressing member 510 is pressed down, and the second compression spring 830 is compressed. After the test is completed, the sliding fastener assembly 60 and the heating assembly 70 release the fixation of the test card body 110, and the pressing block 820 rebounds upward under the action of the second compression spring 830, realizing the automatic pop-up of the test card body 110.

[0090] like Figure 2 , Figure 18 , Figure 19 and Figure 21As shown, the blood gas analyzer also includes a test component 90, which is disposed opposite to the test card body 110 and located on the side of the test card body 110 facing the electrode circuit board 130. The test component 90 includes a detection module 910, a second heating element 920 disposed opposite to the electrode circuit board 130, a housing 930 on which the detection module 910 and the second heating element 920 are fixed, and a fifth driving device 940 that drives the housing 930 to reciprocate toward the side of the electrode circuit board 130. The slider 610 is located above the housing 930. The bottom of the slider 610 is provided with a mating rib 612 protruding toward one side of the housing 930, and the top of the housing 930 is provided with a pushing rib 931 protruding toward one side of the slider 610. The pushing rib 931 is located between the mating rib 612 and the test card body 110. After the test card assembly 10 is inserted into the reagent pack assembly 20, the fifth driving device 940 drives the second heating element 920 on the housing 930 to move towards the electrode circuit board 130. The first plug 611 is inserted into the first limiting groove 116, and the second plug 721 is inserted into the second limiting groove 117. After the test assembly 90 is powered on, it heats the electrode circuit board 130, so that the liquid in the test card body 110 reaches the specified temperature. The current and voltage signals generated on the electrode circuit board 130 are transmitted to the host computer through the detection module 910. The calibration solution and test solution are tested. After the test is completed, the fifth drive device 940 of the test component 90 drives the housing 930 to retract. Since the push rib 931 is located between the mating rib 612 and the test card body 110, when the push rib 931 on the housing 930 contacts the mating rib 612, the push rib 931 continues to retract with the housing 930, and the slider 610 retracts together with the push rib 931. The first compression spring 630 is compressed, and the first plug 611 on the slider 610 is disengaged from the first limiting groove 116. After the test card body 110 automatically pops up, the fifth drive device 940 moves the housing 930 forward, and the slider 610 also moves forward under the action of the first compression spring 630. The mating rib 612 squeezes the pushing rib 931. When the housing 930 moves to the point where there is no force between the pushing rib 931 and the mating rib 612, the first plug 611 of the sliding buckle assembly 60 returns to the initial position, which is convenient for the next round of testing. The clever design of the structure of the mating rib 612 and the pushing rib 931 realizes the position control of the sliding buckle assembly 60 by the test assembly 90, making the action more reliable.

[0091] In this embodiment, as Figure 21As shown, the fifth drive device 940 is a linear stepper motor, and the detection module 910 is a test PCBA assembly. The test PCBA assembly is equipped with a test probe 911. The linear stepper motor has a fifth motor shaft 941, and the housing 930 is fixed to the fifth motor shaft 941 with screws. The test assembly 90 also includes a fifth optocoupler 950. When the fifth linear drive device 940 is powered on, the fifth motor shaft 941 drives the housing 930 to reciprocate along the axial direction of the stepper motor, thereby realizing the testing function. The fifth optocoupler 950 detects and controls the initial position of the fifth motor shaft 941, eliminating positional errors after each reciprocating motion.

[0092] The test card assembly 10, the heating assembly 70, and the test assembly 90 constitute the testing and heating subsystem of the blood gas analyzer. The test card assembly 10 is inserted into the reagent pack assembly 20. The first heating element 710 of the heating assembly 70 is directly opposite the electrode test slot 115 on the test card body 110. The second heating element 920 and the test probe 911 of the test assembly 90 correspond to the electrode circuit board 130 on the test card body 110.

[0093] After the test card assembly 10 is inserted into place, the blood gas analyzer's liquid extraction subsystem operates, drawing the calibration solution or test solution into the electrode test chamber 115; the fourth drive device 730 of the heating assembly 70 is energized, and the fourth motor shaft 731 drives the first heating element 710 forward, pressing it against the sealing membrane 120 of the test card assembly 10; the first heating element 710 is energized, generating heat to heat the sealing membrane 120 and the electrode test chamber 115 of the test card assembly 10, heating the liquid in the electrode test chamber 115 to the set temperature; the fifth drive device 940 of the test assembly 90 is energized, and the fifth motor shaft 941 drives the entire housing 930 forward and presses it against the test card assembly 115. On the electrode circuit board 130 on 0; the second heating element 920 is energized and heated to generate heat to heat the electrode circuit board 130, thereby indirectly heating the liquid in the electrode test tank 115, so that the liquid in the electrode test tank 115 is heated to the set temperature; the test probe 911 of the test component 90 is connected to the output terminal of the electrode circuit board 130, and transmits the current and voltage signals generated on the electrode circuit board 130 to the host to realize the testing of the calibration liquid and the test liquid; after the test card component 10 completes all processes of liquid extraction, heating and testing, the fourth driving device 730 causes the heating component 70 to retract, and the fifth driving device 940 causes the test component 90 to retract so that the test card can be taken out.

[0094] In this embodiment, the first driving device 520, the second driving device 320, the third driving device 450, the fourth driving device 730 and the fifth driving device 940 are all stepper motors. The first driving device 520, the second driving device 320, the third driving device 450, the fourth driving device 730 and the fifth driving device 940 may also adopt other driving methods such as cylinders according to actual needs.

[0095] Compared with traditional blood gas analyzers, the blood gas analyzer of the present invention has the following advantages:

[0096] 1. The test card assembly 10 eliminates the need for steel needle piercing, effectively solving the problem of test card fragmentation; a two-stage waste liquid chamber is designed, with the inlet 1434 at the lower end and the outlet 1435 at the upper end, solving the problem of liquid leakage from the vent 113; the highest point of the calibration liquid pipeline 142 is higher than that of the test liquid pipeline 141, and a leak-proof groove 1421 is designed at the highest point to solve the problem of liquid leakage from the calibration liquid outlet 112; the valve groove 1411 is designed on the test liquid pipeline 141, forming an integral part with the test liquid pipeline 141, eliminating the need for cylindrical rubber stoppers and membrane parts, reducing the number of parts, reducing the risk of leakage, and improving production efficiency.

[0097] 2. The reagent package assembly 20 controls the opening and closing of the liquid and gas paths by the rotary switch assembly 210 and the reagent package valve control assembly 30. The rotary switch technology is mature and reliable, effectively solving the problems of reagent package pipeline blockage and liquid leakage. The opening and closing of each liquid path of the liquid extraction subsystem is controlled by an independent stepper motor, so each opening and closing action can be performed simultaneously. Compared with the existing original turntable system, there is no need for the waiting time of turntable rotation, thus shortening the working cycle.

[0098] 3. The opening and closing of each liquid circuit in the liquid extraction subsystem is controlled by an independent stepper motor. Compared with the gear transmission and spring clamping structure in the existing turntable system, the stepper motor has adjustable speed, smooth and controllable action, and no gear rotation noise or abnormal noise from the pull rod impact. Therefore, the noise is low. At the same time, the gear set, pull rod, spring, roller and other parts are eliminated, reducing the number of parts, simplifying the structure and improving assembly efficiency.

[0099] 4. The testing and heating subsystem uses a stepper motor to control the clamping and loosening of the testing component 90 and the heating component 70. The operation is smooth and controllable, with low noise and high precision.

[0100] 5. The test card body 110 is effectively positioned using the sliding buckle assembly 60, the testing assembly 90, and the heating assembly 70. Initial mechanical positioning is achieved by the elastic force of the first compression spring 630 of the sliding buckle assembly 60; a second precise positioning is achieved by the second plug 721 of the heating assembly 70, thus ensuring reliable positioning of the test card body 110. Furthermore, the front and back sides of the test card body 110 are positioned by the testing assembly 907 and the heating assembly 703 respectively, resulting in uniform force distribution and preventing deformation of the test card body 110. The stepper motor of the testing assembly 90 is fully utilized, and the structure of the push rib 931 and the mating rib 612 is cleverly designed to achieve position control of the sliding buckle assembly 60 by the testing assembly 90, ensuring reliable operation.

[0101] 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.

[0102] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A blood gas analyzer, characterized in that, The device includes a test card assembly and a reagent kit assembly. The test card assembly includes at least a test card body with a calibration liquid port. The test card body also includes a liquid pipeline, an inlet, an exhaust port, and an electrode circuit board. The test card assembly also includes an injection needle. The liquid pipeline includes a test liquid pipeline, a waste liquid chamber, and an electrode pipeline connected to the electrode circuit board. Both ends of the test liquid pipeline are connected to the inlet and the electrode pipeline, respectively. The end of the electrode pipeline away from the test liquid pipeline is connected to the inlet of the waste liquid chamber. The outlet of the waste liquid chamber is connected to the exhaust port, which is located above the inlet. The liquid pipeline also includes a waste liquid pipeline. The waste liquid pipeline is connected between the outlet and the exhaust port. The exhaust port is located below the electrode pipeline, the inlet is located above the electrode pipeline, and the outlet is located above the electrode pipeline. Before the test card assembly is connected to the reagent kit assembly, the air extraction port is not fitted with a sealing plug; The reagent kit assembly includes at least a rotary switch assembly, a liquid storage device, an air inlet device, and a sample injection device equipped with an injection needle. The rotary switch assembly includes a fixed valve body and a rotating body. The rotating body is disposed inside the fixed valve body and can rotate relative to the fixed valve body. The rotating body is provided with a connecting pipe. The fixed valve body is provided with a first port communicating with the liquid storage device, a second port communicating with the sample injection device, and a third port communicating with the air inlet device. The two ends of the injection needle are respectively used to communicate with the second port and the calibration liquid port. Rotating the rotating body allows the rotary switch assembly to be in a first state, a second state, or a third state: the first state is that the second port is connected to the first port through the connecting pipe; the second state is that the second port is connected to the third port through the connecting pipe; the third state is that both the second port and the first port are closed. When the rotary switch assembly is in the first state, the liquid storage device is connected to the injection device, and the calibration solution can be extracted. When the rotary switch assembly is in the second state, the sample injection device is connected to the air inlet device, and air can be extracted. When the rotary switch assembly is in the third state, both the second port and the first port are closed, and the sample injection device is turned off to extract the test solution. After the test card assembly is connected to the reagent pack assembly, when the blood gas analyzer extracts calibration solution, extracts air, and extracts test solution, the test card assembly is still connected to the reagent pack assembly, and the injection needle is still connected to the calibration solution port. The reagent kit assembly also includes a housing with a placement cavity, the fixed valve body is fixed in the placement cavity, the connecting pipe is an L-shaped pipe, the housing is provided with a rotating handle connected to the rotating body, and the rotating handle is exposed on the housing. When in use, rotating the rotating handle can adjust the rotating switch assembly to different states. The reagent kit assembly also includes a support base, which is fixed on the outer shell. The injection device includes the injection needle and the injection tube. The injection needle is fixed on the support base and is used to connect with the calibration liquid port. One end of the injection tube is sleeved on the injection needle, and the other end is sleeved on the second tube port. The injection needle communicates with the second tube port through the injection tube. The blood gas analyzer also includes a sliding fastener assembly, which is disposed opposite to the test card body and located on the side of the test card body facing the electrode circuit board. The sliding fastener assembly includes a slider, a first fixing seat, and a first compression spring with its two ends respectively abutting against the slider and the first fixing seat. The slider has a first plug protruding towards one side of the test card body, and the test card body has a first limiting groove that cooperates with the first plug. After the test card assembly is inserted into the reagent pack assembly, the slider, under the action of the first compression spring, causes the first plug on the slider to be inserted into the first limiting groove, thereby positioning the test card body. The blood gas analyzer also includes a heating assembly, which is disposed opposite to the test card body and located on the side of the test card body facing away from the electrode circuit board. The heating assembly includes a first heating element disposed opposite to the electrode circuit board, a heating element fixing bracket fixed to the first heating element, and a fourth driving device that drives the heating element fixing bracket to reciprocate towards the electrode circuit board. The heating element fixing bracket has a second plug protruding towards the test card body. The test card body has a second limiting groove that mates with the second plug. After the test card assembly is inserted into the reagent pack assembly, the slider, under the action of the first compression spring, causes the first plug on the slider to insert into the first limiting groove, achieving initial positioning of the test card body. Under the action of the fourth driving device, the second plug moves towards the test card body and inserts into the second limiting groove, achieving secondary positioning of the test card body. The first heating element heats the liquid inside the test card body to reach a specified temperature. The sliding assembly and the heating assembly perform bilateral positioning of the front and back of the test card body.

2. A blood gas analyzer, characterized in that, Includes reagent kit components and test card components; The test card assembly includes at least a test card body with a calibration liquid port. The test card body also includes a liquid pipeline, a sample inlet, a suction port, and an electrode circuit board. The test card assembly also includes a sample injection needle. The liquid pipeline includes a test liquid pipeline, a waste liquid chamber, and an electrode pipeline connected to the electrode circuit board. Both ends of the test liquid pipeline are connected to the sample inlet and the electrode pipeline, respectively. The end of the electrode pipeline away from the test liquid pipeline is connected to the inlet of the waste liquid chamber. The outlet of the waste liquid chamber is connected to the suction port, and the outlet is located above the inlet. The liquid pipeline also includes a waste liquid pipeline. The waste liquid pipeline is connected between the outlet and the suction port. The suction port is located below the electrode pipeline, the inlet is located above the electrode pipeline, and the outlet is located above the electrode pipeline. Before the test card assembly is connected to the reagent kit assembly, the air extraction port is not fitted with a sealing plug; The reagent kit assembly includes at least a rotary switch assembly, a liquid storage device, an air inlet device, and a sample injection device equipped with an injection needle. The rotary switch assembly includes a fixed valve body and a rotating body. The rotating body is disposed inside the fixed valve body and can rotate relative to the fixed valve body. The rotating body is provided with a connecting pipe. The fixed valve body is provided with a first port communicating with the liquid storage device, a second port communicating with the sample injection device, and a third port communicating with the air inlet device. The two ends of the injection needle are respectively used to communicate with the second port and the calibration liquid port. Rotating the rotating body allows the rotary switch assembly to be in a first state, a second state, or a third state: the first state is that the second port is connected to the first port through the connecting pipe; the second state is that the second port is connected to the third port through the connecting pipe; the third state is that both the second port and the first port are closed. When the rotary switch assembly is in the first state, the liquid storage device is connected to the injection device, and the calibration solution can be extracted. When the rotary switch assembly is in the second state, the sample injection device is connected to the air inlet device, and air can be extracted. When the rotary switch assembly is in the third state, both the second port and the first port are closed, and the sample injection device is turned off to extract the test solution. After the test card assembly is connected to the reagent pack assembly, when the blood gas analyzer extracts calibration solution, extracts air, and extracts test solution, the test card assembly is still connected to the reagent pack assembly, and the injection needle is still connected to the calibration solution port. The reagent kit assembly also includes a housing with a placement cavity, the fixed valve body is fixed in the placement cavity, the connecting pipe is an L-shaped pipe, the housing is provided with a rotating handle connected to the rotating body, and the rotating handle is exposed on the housing. When in use, rotating the rotating handle can adjust the rotating switch assembly to different states. The reagent kit assembly also includes a support base, which is fixed on the outer shell. The injection device includes the injection needle and the injection tube. The injection needle is fixed on the support base and is used to connect with the calibration liquid port. One end of the injection tube is sleeved on the injection needle, and the other end is sleeved on the second tube port. The injection needle communicates with the second tube port through the injection tube. The blood gas analyzer also includes a piston pump assembly, which includes a suction needle with one end connected to the suction port, a suction tube with one end connected to the other end of the suction needle, a connector connected to the other end of the suction tube, a piston connected to the connector, and a third drive device for driving the piston to perform linear reciprocating motion. The suction needle and the suction tube are fixed on the support base of the reagent pack assembly.

3. A reagent pack assembly for a blood gas analyzer, characterized in that, The reagent kit assembly includes at least a rotary switch assembly, a liquid storage device, an air inlet device, and a sample injection device equipped with an inlet needle. The rotary switch assembly includes a fixed valve body with a first port communicating with the liquid storage device, a second port communicating with the sample injection device, and a third port communicating with the air inlet device, and a rotating body with a connecting pipe. The rotating body is disposed inside the fixed valve body and can rotate relative to the fixed valve body to achieve communication between the first port and the second port, or between the second port and the third port, or to close the second port. Rotating the rotating body allows the rotary switch assembly to be in a first state, a second state, or a third state: The first state is that the second pipe opening and the first pipe opening are connected through the connecting pipe; The second state is that the second pipe opening and the third pipe opening are connected through the connecting pipe; The third state is that both the second pipe opening and the first pipe opening are closed; Before the test card assembly is connected to the reagent kit assembly, the air extraction port of the test card assembly is not fitted with a sealing plug; When the test card assembly is connected to the reagent pack assembly, the reagent pack assembly is directly connected to the air extraction port of the test card assembly, eliminating the problem of debris being generated due to puncturing the sealing plug and eliminating the risk of debris contaminating the electrode and causing the test to be scrapped. The test card assembly includes at least a test card body with a calibration liquid port. The test card body also includes a liquid pipeline, a sample inlet, an air extraction port, and an electrode circuit board. The liquid pipeline includes a test liquid pipeline, a waste liquid chamber, and an electrode pipeline connected to the electrode circuit board. Both ends of the test liquid pipeline are connected to the sample inlet and the electrode pipeline, respectively. The end of the electrode pipeline away from the test liquid pipeline is connected to the inlet of the waste liquid chamber. The outlet of the waste liquid chamber is connected to the air extraction port. The outlet is located above the inlet. The liquid pipeline also includes a waste liquid pipeline. The waste liquid pipeline is connected between the outlet and the air extraction port. The air extraction port is located below the electrode pipeline, the inlet is located above the electrode pipeline, and the outlet is located above the electrode pipeline. The reagent kit assembly also includes a housing with a placement cavity. The housing includes a front housing and a rear housing, which are fixed together by screws. The fixed valve body is fixed inside the placement cavity. The connecting pipe is an L-shaped pipe. The housing is provided with a rotating handle connected to the rotating body, and the rotating handle is exposed on the housing. When in use, rotating the rotating handle can adjust the rotating switch assembly to different states. The reagent kit assembly also includes a support base, which is fixed to the outer shell. The injection device includes the injection needle and the injection tube. The injection needle is fixed to the support base and is used to connect to the calibration liquid port. One end of the injection tube is sleeved on the injection needle, and the other end is sleeved on the second port. The injection needle communicates with the second port through the injection tube.

4. A test card assembly capable of connecting to a reagent pack assembly for a blood gas analyzer, characterized in that, The test card assembly includes at least a test card body with a calibration liquid port. The test card body also includes a liquid pipeline, a sample inlet, a suction port, and an electrode circuit board. The test card assembly also includes a sample injection needle. The liquid pipeline includes a test liquid pipeline, a waste liquid chamber, and an electrode pipeline connected to the electrode circuit board. Both ends of the test liquid pipeline are connected to the sample inlet and the electrode pipeline, respectively. The end of the electrode pipeline away from the test liquid pipeline is connected to the inlet of the waste liquid chamber. The outlet of the waste liquid chamber is connected to the suction port, and the outlet is located above the inlet. The liquid pipeline also includes a waste liquid pipeline. The waste liquid pipeline is connected between the outlet and the suction port. The suction port is located below the electrode pipeline, the inlet is located above the electrode pipeline, and the outlet is located above the electrode pipeline. Before the test card assembly is connected to the reagent kit assembly, the extraction port is not fitted with a sealing plug.

5. The test card assembly according to claim 4, characterized in that, The liquid pipeline includes a calibration solution pipeline. One end of the test solution pipeline is connected to the injection port, and the other end is connected to the calibration solution pipeline and the electrode pipeline. The end of the calibration solution pipeline away from the test solution pipeline is connected to the calibration solution port. The highest point of the calibration solution pipeline is higher than the liquid surface of the test solution. The highest point of the calibration solution pipeline has an upward-facing anti-leakage groove. There is a cross-sectional difference between the anti-leakage groove and the calibration solution pipeline. Before the test card assembly is connected to the reagent pack assembly, neither the air extraction port nor the calibration liquid port is fitted with a sealing plug.

6. The test card assembly according to claim 5, characterized in that, The waste liquid chamber includes a first waste liquid chamber and a second waste liquid chamber arranged side by side, and a drain port connecting the first waste liquid chamber and the second waste liquid chamber. The bottom of the first waste liquid chamber is provided with the inlet port, and the top of the second waste liquid chamber is provided with the outlet port. The drain port is located on the side close to the outlet port and connects the top of the first waste liquid chamber and the second waste liquid chamber. There is a cross-sectional difference between the drain port and the waste liquid chamber. The first waste liquid chamber and the second waste liquid chamber are located above the electrode pipe.

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