A cerebrospinal fluid sampling and testing device

Abstract

The utility model belongs to the technical field of medical apparatus and instruments, especially relates to a cerebrospinal fluid sampling and detecting device. Including three -way valve and the sampling tube of depositing cerebrospinal fluid, the liquid inlet and one of the liquid outlet of three -way valve are all provided with the catheter, and the other liquid outlet of three -way valve is connected with the catheter through the connector, the connector includes the cannula of inserting the liquid outlet pipe of three -way valve, the liquid outlet of liquid outlet pipe is provided with annular groove, and the limit ring of fixed in the outside of cannula is embedded in annular groove, and the connecting pipe of inserting the sampling tube spout is arranged in the liquid outlet end of cannula, and the sealing cover of covering it is arranged at connecting pipe, and the sealing cover is connected with connecting pipe through connecting rope, and the first baffle is arranged in sealing cover, the cross -shaped cut -out of cutting the first baffle center is arranged at the first baffle center, and the first sterilizing cotton of disinfecting connecting pipe is arranged in the first baffle inboard. The utility model makes three -way valve continuously be in the disinfection and sterilization state, and the accuracy of cerebrospinal fluid sample detection is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, and in particular relates to a cerebrospinal fluid sampling and detection device. Background Technology

[0002] Cerebrospinal fluid (CSF) is a colorless, transparent liquid found in the ventricles and subarachnoid space. Changes in its composition can reflect the pathological state of the central nervous system, such as infection (meningitis), hemorrhage (subarachnoid hemorrhage), tumors, or autoimmune diseases (such as multiple sclerosis). CSF testing is an important diagnostic tool in neurology, neurosurgery, and infectious disease departments. External cranial drainage devices are commonly used in neurosurgery for treatment and monitoring, primarily for regulating CSF drainage, monitoring intracranial pressure, and obtaining CSF samples. When draining CSF using an external cranial drainage device, the puncture point is confirmed based on preoperative imaging. A cored needle can be inserted into the anterior horn of the lateral ventricle through a burr hole in the frontal lobe, or a catheter can be placed via lumbar puncture with the needle tip positioned in the lumbar cistern. After observing CSF flow, the needle is fixed in place, and the drainage catheter, three-way valve, pressure sensor, and drainage bag are connected sequentially. The interfaces are ensured to be airtight. The height of the drainage bag is adjusted, typically 10-15 cm above the external auditory canal, for precise drainage of CSF.

[0003] During drainage, cerebrospinal fluid (CSF) needs to be sampled and tested. When sampling, the three-way valve interface is disinfected three times with iodine or alcohol swabs. The syringe is connected to the three-way valve interface, and then the three-way valve is rotated to close the drainage bag, opening the syringe access for the patient. After sampling the CSF, drainage is restored. The CSF in the syringe is then injected into bacterial culture tubes, biochemical detection tubes, and routine detection tubes, and the samples are sent for testing. However, dispensing CSF using a syringe can cause cross-contamination, and biofilms easily form at the three-way valve interface. Colonizing bacteria in the biofilm can contaminate the sample, leading to errors in the CSF sample test results. Utility Model Content

[0004] The purpose of this invention is to provide a cerebrospinal fluid sampling and testing device that ensures the three-way valve interface is not contaminated and is in a sterilized state.

[0005] The cerebrospinal fluid sampling and testing device includes a three-way valve and a sampling tube for storing cerebrospinal fluid. The three-way valve has a conduit at its inlet and one of its outlets. The other outlet of the three-way valve is connected to the conduit via a connector. The connector includes an insertion tube for inserting into the outlet tube of the three-way valve. An annular groove is formed at the outlet of the outlet tube, and a limiting ring fixed to the outside of the insertion tube is embedded in the annular groove. A connecting tube is provided at the outlet end of the insertion tube for inserting into the sampling tube opening. A sealing cap is provided at the connecting tube to cover it. The sealing cap is connected to the connecting tube via a connecting rope. A first sealing plate is provided inside the sealing cap. A cross-shaped cut is provided at the center of the first sealing plate. A first disinfectant cotton is provided inside the first sealing plate to disinfect the connecting tube.

[0006] Furthermore, the outlet of the three-way valve outlet pipe is provided with several limiting strips arranged in a circumferential array along the center of the outlet pipe, and a locking sleeve threadedly fitted onto the limiting strip.

[0007] Furthermore, the inner wall of the outlet pipe of the three-way valve is provided with a second sealing plate, the center of the second sealing plate is provided with a cross-shaped cut, and the inner side of the second sealing plate is provided with a second disinfecting cotton for disinfecting the insertion tube.

[0008] Furthermore, the diameter of the connecting tube is smaller than the inner diameter of the sampling tube.

[0009] Furthermore, the insertion tube, the limiting ring, and the connecting tube are integrally formed.

[0010] Furthermore, the first sealing sheet is made of silicone material.

[0011] Compared with the prior art, the present invention has the following beneficial effects: This invention uses a connector to seal the outlet pipe of a three-way valve. The sealing cap of the connector covers the connecting pipe, and the first sterile cotton inside the sealing cap sterilizes and disinfects it, keeping it in a sterile state. When cerebrospinal fluid (CSF) needs to be sampled for testing during drainage, the sealing cap is opened to expose the connecting pipe. The first sealing plate inside the sealing cap keeps the first sterile cotton sealed, preventing contamination. Then, the connecting pipe is inserted into the opening of the sampling tube, and CSF flows into the sampling tube through the connector, facilitating CSF sample collection. After sampling, the sealing cap is closed again on the connecting pipe, keeping the three-way valve continuously sterilized and ensuring the accuracy of CSF sample test results. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a perspective view of the present utility model; Figure 3This is an exploded view of the present invention; The components in the diagram are named as follows: 1. Three-way valve; 2. Limiting ring; 3. Locking sleeve; 4. Limiting strip; 5. Insertion tube; 6. Connecting tube; 7. Sampling tube; 8. Connecting rope; 9. First sealing plate; 10. First disinfectant cotton; 11. Sealing cap; 12. Second sealing plate; 13. Second disinfectant cotton; 14. Tube. Detailed Implementation

[0013] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention. Example

[0014] The cerebrospinal fluid sampling and detection device described in this embodiment, such as Figure 1 , Figure 2 and Figure 3 As shown, the device includes a three-way valve 1 and a sampling tube 7 for storing cerebrospinal fluid. The inlet and one outlet of the three-way valve 1 are each provided with a conduit 14. The other outlet of the three-way valve 1 is connected to the conduit 14 via a connector. The connector includes an insertion tube 5 that is inserted into the outlet tube of the three-way valve 1. An annular groove is provided at the outlet of the outlet tube. A limiting ring 2 fixed to the outside of the insertion tube 5 is embedded in the annular groove. A connecting tube 6 is provided at the outlet end of the insertion tube 5 to be inserted into the port of the sampling tube 7. A sealing cap 11 is provided at the connecting tube 6 to cover it. The sealing cap 11 is connected to the connecting tube 6 via a connecting rope 8. A first sealing plate 9 is provided inside the sealing cap 11. A cross-shaped cut is provided at the center of the first sealing plate 9. A first disinfectant cotton 10 for disinfecting the connecting tube 6 is provided inside the first sealing plate 9. The three-way valve 1 has a conduit 14 at both its inlet and one outlet. Both conduits 14 are connected to the three-way valve 1 via Luer connectors. After puncture with a puncture needle, the conduit 14 is left in place and the puncture needle is removed. The outlet end of the other conduit 14 is connected to the inlet of the three-way valve 1 via a Luer connector; the inlet end of the other conduit 14 is connected to the outlet of the three-way valve 1 via a Luer connector. The outlet end of the other conduit 14 is connected to an anti-backflow drainage bag. The conduit 14 is equipped with… The drip bottle with an anti-backflow valve is used to monitor cerebrospinal fluid pressure in real time. In use, after determining the puncture site based on the influence, a puncture needle is inserted to insert the catheter 14. Then the catheter 14 is fixed. The cerebrospinal fluid flows through the catheter 14, through the three-way valve 1, and then along another catheter 14 to the drip bottle, and then flows into the drainage bag to drain and collect the cerebrospinal fluid. This is the connection method and usage method of the external brain drainage device. This embodiment does not improve it and is only used as existing technology. The outlet of the three-way valve 1 is connected to the conduit 14 via a connector. The connector includes a tube 5, with a limiting ring 2 on the outside of the tube 5. There is a gap between the tube 5 and the limiting ring 2. The tube 5 and the limiting ring 2 are connected by a connecting ring. A connecting tube 6 is provided on the limiting ring 2. The tube 5, the limiting ring 2, the connecting ring, and the connecting tube 6 are integrally formed, which facilitates production and makes the connection more secure and sealed. The tube 5 is inserted into the outlet of the outlet pipe of the three-way valve 1, and the limiting ring 2 is embedded in the annular groove of the outlet pipe. The limiting ring 2 and the annular groove are interlocked, thereby fixing the connecting tube 6 to the outlet pipe of the three-way valve 1. When the connecting tube 6 is contaminated or damaged, it can be removed from the outlet of the outlet pipe of the three-way valve 1 and replaced with a new one, making it more flexible to use. One end of the connecting rope 8 is fixed to the connecting pipe 6, and the other end is fixed to the sealing cap 11. The connecting rope 8 prevents the sealing cap 11 from being lost. A first sealing plate 9 is adhered to the inner wall of the sealing cap 11. The first sealing plate 9 has a cross-shaped cut at its center. A first disinfectant cotton 10 is adhered to the inner wall of the sealing cap 11 inside the first sealing plate 9. The first disinfectant cotton 10 has a barrel-shaped structure, and its bottom contacts the top of the inner side of the sealing cap 11. The first sealing plate 9 is made of silicone material. Silicone is soft and elastic. The four-lobed structure of the cross-shaped cut at the center of the first sealing plate 9 closes naturally without external force, forming an initial seal. The sealing cap 11 is then placed on the connecting pipe. When the connecting tube 6 is inserted, it passes through the cross-shaped cut of the first sealing plate 9. The four petals of the cut are compressed and expand elastically outward, tightly wrapping the wall of the connecting tube 6 and filling the microscopic gap between the wall of the connecting tube 6 and the cut. The diameter of the cross-shaped cut is slightly smaller than the outer diameter of the connecting tube 6, ensuring that the connecting tube 6 undergoes appropriate compression deformation after being inserted into the cut of the first sealing plate 9. The first sealing plate 9 exerts a compressive force on the connecting tube 6, fixing the sealing cap 11 onto the connecting tube 6, so that the sealing cap 11 provides sealing protection for the connecting tube 6. The cross-shaped structure evenly distributes the radial pressure of the connecting tube 6, avoiding local stress that could lead to seal failure. The elasticity of the silicone allows the cross-shaped cut petals to be compressed as the sealing cap 11 extends from the connecting tube 6. After being removed, the sealing cap automatically closes, sealing and protecting the first disinfectant cotton 10 inside the first sealing plate 9. The connecting tube 6 passes through the cross-shaped cut of the first sealing plate 9 and contacts the inner wall of the first disinfectant cotton 10. The first disinfectant cotton 10 is soaked in disinfectant alcohol or iodine to disinfect the connecting tube 6. The first disinfectant cotton 10 can kill any bacteria that may be present on the surface of the connecting tube 6, reducing the bacterial load on the connecting tube 6 and lowering the risk of infection during cerebrospinal fluid sampling. When the sealing cap 11 is removed from the connecting tube 6, the cross-shaped cut of the first sealing plate 9 closes naturally without external force, isolating external bacteria and other contaminants, ensuring the first disinfectant cotton 10 inside the first sealing plate 9 is sealed and protected. The disinfection effect of the 10 disinfectant cotton on the connecting tube 6 is that the first disinfectant cotton 10 continuously disinfects the connecting tube 6, extending its safe service life. It eliminates the need for frequent disassembly of the connecting tube 6 for disinfection, reducing the risk of contamination. It is especially suitable for patients who need long-term indwelling cerebrospinal fluid drainage. The outlet end of the connecting tube 6 is inserted into the opening of the sampling tube 7. The diameter of the connecting tube 6 is smaller than the inner diameter of the opening of the sampling tube 7, so that the outlet end of the connecting tube 6 does not come into contact with the inner wall of the sampling tube 7 as much as possible. This prevents the inner wall of the sampling tube 7 from being contaminated by attached environmental microorganisms, avoids cross-contamination, and also avoids interference from residual alcohol or iodine on the outlet end of the connecting tube 6 on the cerebrospinal fluid sampling and testing, ensuring the accuracy of the cerebrospinal fluid sample. like Figure 1 and Figure 3As shown, the outlet of the three-way valve 1 is provided with several limiting strips 4 arranged in a circular array along the center of the outlet pipe. A locking sleeve 3, threadedly engaged with each limiting strip 4, is fitted onto the limiting strip 4. Several limiting strips 4 are adhered to the outlet of the three-way valve 1, and each limiting strip 4 has an external thread. The inner wall of the locking sleeve 3 has an internal thread that engages with the external thread. The locking sleeve 3 is fitted onto the outlet pipe, and the locking sleeve 3 is threadedly engaged with the external threads on the limiting strips 4. Tightening the locking sleeve 3 reduces the gap between several limiting strips 4, thereby firmly clamping the limiting ring 2 within the annular groove. This ensures the stability of the connection between the connector and the outlet pipe of the three-way valve 1, preventing it from loosening during sampling. The threaded connection between the limiting strip 4 and the locking sleeve 3 is a tapered thread, which enhances the sealing at the connection between the three-way valve 1 and the connector, preventing bacterial contamination of the three-way valve 1 and ensuring the accuracy of the cerebrospinal fluid sample. like Figure 1 and Figure 3 As shown, the inner wall of the outlet tube of the three-way valve 1 is provided with a second sealing plate 12, and a cross-shaped cut is provided at the center of the second sealing plate 12. A second disinfectant cotton 13 for disinfecting the insertion tube 5 is provided on the inner side of the second sealing plate 12. The second sealing plate 12 is attached to the inner wall of the outlet tube of the three-way valve 1. The cross-shaped cut of the second sealing plate 12 facilitates the insertion tube 5 to pass through and be inserted into the outlet tube. The second disinfectant cotton 13 is attached to the inner wall of the outlet tube on the inner side of the second sealing plate 12. The insertion tube 5 contacts the second disinfectant cotton 13, and the second disinfectant cotton 13 disinfects the insertion tube 5. When the insertion tube 5 is inserted into the outlet tube of the three-way valve 1, the cross-shaped cut of the second sealing plate 12 is pushed open, and the insertion tube 5 is squeezed and fixed by the second sealing plate 12. The second disinfectant cotton 13 disinfects it, thereby ensuring that the connector is in a sterile state when connected to the three-way valve 1, and ensuring the accuracy of the cerebrospinal fluid sampling sample. In actual use, the limiting ring 2 is embedded into the annular groove of the outlet pipe of the three-way valve 1 and interlocked with it. Then, the insertion tube 5 is inserted into the outlet pipe of the three-way valve 1, so that the connecting tube 6 is fixed on the outlet pipe of the three-way valve 1. The sealing cap 11 protects and seals the connecting tube 6. The first disinfectant cotton 10 inside the sealing cap 11 disinfects the connecting tube 6, keeping it in a sterile state to prevent external bacteria from entering the three-way valve 1 and reduce the risk of infection. Cerebrospinal fluid is drained through the catheter 14. When it is necessary to sample and test the cerebrospinal fluid, the sealing cap 11 is closed. Remove the connecting tube 6 to expose it, then insert the connecting tube 6 into the opening of the sampling tube 7. Turn the valve of the three-way valve 1 to connect the catheter 14 to the connecting tube 6, allowing the cerebrospinal fluid to flow from the connecting tube 6 into the sampling tube 7. The sampling tube 7 stores the cerebrospinal fluid. Send multiple sampling tubes 7 containing cerebrospinal fluid for testing to make the cerebrospinal fluid sample test results more accurate. After sampling, put the sealing cap 11 back on the connecting tube 6, and disinfect the first disinfectant cotton 10 inside the sealing cap 11 again to ensure its sterility.

Claims

1. A cerebrospinal fluid sampling and detection device, comprising a three-way valve (1) and a sampling tube (7) for storing cerebrospinal fluid, wherein a conduit (14) is provided at both the inlet and one outlet of the three-way valve (1), and the other outlet of the three-way valve (1) is connected to the conduit (14) via a connector, characterized in that: The connector includes a tube (5) for inserting into the outlet tube of the three-way valve (1). An annular groove is provided at the outlet of the outlet tube. A limiting ring (2) fixed to the outside of the tube (5) is embedded in the annular groove. A connecting tube (6) for inserting into the outlet of the sampling tube (7) is provided at the outlet end of the tube (5). A sealing cap (11) is provided at the connecting tube (6) to cover it. The sealing cap (11) is connected to the connecting tube (6) by a connecting rope (8). A first sealing plate (9) is provided inside the sealing cap (11). A cross-shaped cut is provided at the center of the first sealing plate (9). A first disinfectant cotton (10) for disinfecting the connecting tube (6) is provided inside the first sealing plate (9).

2. The cerebrospinal fluid sampling and detection device according to claim 1, characterized in that: The three-way valve (1) has several limiting strips (4) arranged in a circular array along the center of the outlet pipe at the outlet port. The limiting strips (4) are fitted with locking sleeves (3) that are threaded together with them.

3. The cerebrospinal fluid sampling and detection device according to claim 1, characterized in that: The inner wall of the outlet pipe of the three-way valve (1) is provided with a second sealing plate (12), a cross-shaped cut is provided at the center of the second sealing plate (12), and a second disinfection cotton (13) for disinfecting the insertion tube (5) is provided on the inner side of the second sealing plate (12).

4. The cerebrospinal fluid sampling and detection device according to claim 1, characterized in that: The diameter of the connecting pipe (6) is smaller than the inner diameter of the sampling pipe (7).

5. The cerebrospinal fluid sampling and detection device according to claim 2, characterized in that: The insertion tube (5), the limiting ring (2), and the connecting tube (6) are integrally formed.

6. The cerebrospinal fluid sampling and detection device according to claim 1, characterized in that: The first sealing sheet (9) is made of silicone material.

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