Pressure measuring device for cerebrospinal fluid drainage

Abstract

The utility model provides a pressure measuring device for cerebrospinal fluid drainage, and relates to the technical field of medical instruments, the pressure measuring device comprises a drainage tube, a pressure measuring mechanism, a ventilation mechanism and a switching valve, the pressure measuring mechanism is provided with a pressure measuring tube and a pressure sensor, the pressure measuring tube is internally provided with a pressure measuring chamber, and the pressure sensor is arranged in the pressure measuring chamber; the ventilation mechanism comprises a ventilation pipeline, and a ventilation opening is formed in the outer end of the ventilation pipeline and communicates with the atmosphere. The piezometric tube is arranged between the drainage tube and the ventilation pipeline, the inner end of the piezometric tube is communicated with the drainage tube, and the switching valve is arranged between the outer end of the piezometric tube and the ventilation pipeline; the state of the switching valve is changed, so that the pressure measuring chamber is communicated with the ventilation opening through the switching valve, the pressure sensor is communicated with the atmosphere through the ventilation opening, zero calibration can be conducted on the pressure sensor at any time, and it is guaranteed that pressure measured by the pressure sensor is more accurate. By changing the state of the switching valve, whether the pressure measuring chamber is communicated with the air vent or not can be controlled at any time, and zero calibration operation is convenient.

Description

Technical Field

[0001] This application belongs to the technical field of medical devices, and more specifically, relates to a pressure measuring device for cerebrospinal fluid drainage. Background Technology

[0002] Intracranial pressure (ICP) refers to the pressure exerted by the contents of the cranial cavity on the walls of the cranial cavity, also known as intracranial pressure. Cerebrospinal fluid (CSF), located in the subarachnoid space and cisterns, lies between the cranial cavity walls and brain tissue, and communicates with the ventricles and the subarachnoid space within the spinal canal. The hydrostatic pressure of CSF can represent intracranial pressure, usually measured in the lateral decubitus position. Under normal circumstances, the average intracranial pressure remains within a narrow range: adults: 5-15 mmHg; children: 3-6 mmHg; full-term infants: 1.5-6 mmHg.

[0003] When a patient suffers internal or external head injury, the damaged tissues within the skull will leak fluid or blood, leading to increased intracranial pressure. If the patient's intracranial pressure (ICP) rises to more than 20 mmHg within 1 hour and lasts for more than 15 minutes, external cranial drainage needs to be performed within 5 to 30 minutes to decompress the intracranial pressure and control it below 20 mmHg to avoid a series of serious consequences. Clinically, at this time, surgical external or external drainage must be performed to relieve symptoms, reduce intracranial pressure, and carry out treatment.

[0004] Existing pressure measurement devices mainly have the following problems: The core of the pressure sensor is the sensitive element, which can convert pressure signals into electrical signals. In clinical use, after catheter placement, the pressure sensor will experience zero drift, requiring recalibration every few days. This requires aligning the drainage collection bottle outlet, the intracranial pressure sensor, and the patient's external auditory canal or mid-axillary line. After zeroing, the drainage collection bottle needs to be readjusted to the required drainage height, which is inconvenient. The pressure sensor for monitoring intracranial pressure is a hydraulic sensor. Hydraulic sensors measure intracranial pressure more accurately, but in cases of cysts, hematomas, etc., the drainage fluid may contain some tissue, which may block the pressure sensor and cause it to malfunction. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a pressure measuring device for cerebrospinal fluid drainage. The technical solution adopted in this application is as follows:

[0006] A pressure measuring device for cerebrospinal fluid drainage includes a drainage tube, a pressure measuring mechanism, a ventilation mechanism, and a switching valve. The pressure measuring mechanism is equipped with a pressure measuring tube and a pressure sensor. A pressure measuring chamber is provided inside the pressure measuring tube, and the pressure sensor is located inside the pressure measuring chamber. The ventilation mechanism includes a ventilation pipe with a vent at its outer end, which is connected to the atmosphere. The pressure measuring tube is located between the drainage tube and the ventilation pipe, and its inner end is connected to the drainage tube. The switching valve is located between the outer end of the pressure measuring tube and the ventilation pipe.

[0007] Optionally, the switching valve is provided with a switching valve body, the switching valve body is provided with a switching valve cavity, and the switching valve body is provided with a first channel port, a second channel port and a third channel port. The inner ends of the first channel port, the second channel port and the third channel port are all connected to the switching valve cavity; the outer ends of the first channel port and the third channel port are respectively connected to the pressure measuring chamber and the ventilation chamber.

[0008] Optionally, it also includes a syringe, which has an injection chamber that is connected to a second channel port; the first channel port is disposed opposite to the second channel port, and the third channel port is disposed between the first channel port and the second channel port.

[0009] Optionally, the injection cavity is filled with physiological saline.

[0010] Alternatively, the syringe may employ a push-pull infusion device.

[0011] Optionally, the switching valve also includes a switching valve core, which is rotatably disposed within the switching valve chamber; the switching valve core is provided with a switching inner plug, which can block any one of the first channel port, the second channel port, and the third channel port.

[0012] Optionally, the ventilation system may also include an air filter located at the ventilation port.

[0013] Optionally, the ventilation duct is provided with a ventilation chamber, and a hydrophobic membrane is provided inside the ventilation chamber; the ventilation chamber is connected to the ventilation port.

[0014] Optionally, the drainage tube also includes a drainage valve, which is located at the connection between the drainage tube and the pressure measuring tube. The drainage valve has a drainage valve body, which has a drainage valve cavity. The drainage valve body has a fourth channel port, a fifth channel port, and a sixth channel port. The inner ends of the fourth, fifth, and sixth channel ports are all connected to the drainage valve cavity. The outer ends of the fourth and fifth channel ports are connected to the drainage tube, and the outer end of the sixth channel port is connected to the pressure measuring tube.

[0015] Optionally, the drainage valve also includes a drainage valve core, which is rotatably disposed within the drainage valve cavity; the drainage valve core is provided with a drainage inner plug, which can block any one of the fourth, fifth, and sixth channel ports.

[0016] The advantages of this invention are as follows:

[0017] By changing the state of the switching valve, the pressure measuring chamber is connected to the vent through the switching valve, and the pressure sensor is connected to the atmosphere through the vent. This allows the pressure sensor to be zeroed at any time, ensuring more accurate pressure measurements. By changing the state of the switching valve, the connection between the pressure measuring chamber and the vent can be controlled at any time, making zeroing convenient.

[0018] The pressure measuring tube is located between the drainage tube and the syringe, and the pressure measuring tube connects the drainage tube and the syringe. If a blood clot enters the pressure measuring chamber and blocks the pressure sensor, physiological saline is injected into the injection chamber. The saline is then pressurized by the syringe and sent into the pressure measuring chamber, which can clear the blockage area and flush the pressure sensor, ensuring that the pressure sensor can accurately measure the pressure. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of a pressure measuring device calibrating a pressure sensor to zero.

[0021] Figure 2 This is a schematic diagram of cleaning the pressure sensor in a pressure measuring device.

[0022] Figure 3 This is a schematic diagram of a pressure measuring device measuring pressure.

[0023] Explanation of symbols in the diagram:

[0024] 1 is the drainage tube, 11 is the drainage valve, 111 is the drainage valve body, 112 is the drainage valve cavity, 113 is the fourth channel port, 114 is the fifth channel port, 115 is the sixth channel port, and 116 is the drainage valve core.

[0025] 2 is the pressure measuring mechanism, 21 is the pressure measuring tube, 211 is the pressure measuring chamber, and 22 is the pressure sensor;

[0026] 3 is the syringe, and 31 is the injection chamber;

[0027] 4 is the ventilation mechanism, 41 is the ventilation duct, 42 is the ventilation chamber, 43 is the air filter, 44 is the vent, and 45 is the hydrophobic membrane.

[0028] 5 is the switching valve, 51 is the switching valve body, 511 is the first channel port, 512 is the second channel port, 513 is the third channel port, 52 is the switching valve chamber, and 53 is the switching valve core. Detailed Implementation

[0029] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0030] like Figure 1 As shown, a pressure measuring device for cerebrospinal fluid drainage includes a drainage tube 1, a pressure measuring mechanism 2, a ventilation mechanism 4, and a switching valve 5. The pressure measuring mechanism 2 is equipped with a pressure measuring tube 21 and a pressure sensor 22. A pressure measuring chamber 211 is provided inside the pressure measuring tube 21, and the pressure sensor 22 is located inside the pressure measuring chamber 211. The ventilation mechanism 4 includes a ventilation pipe 41, and a vent 44 is provided at the outer end of the ventilation pipe 41, which is connected to the atmosphere. The pressure measuring tube 21 is located between the drainage tube 1 and the ventilation pipe 41, and the inner end of the pressure measuring tube 21 is connected to the drainage tube 1. The switching valve 5 is located between the outer end of the pressure measuring tube 21 and the ventilation pipe 41.

[0031] By changing the state of the switching valve 5, the pressure measuring chamber 211 is connected to the vent 44 through the switching valve 5, and the pressure sensor 22 is connected to the atmosphere through the vent 44. The pressure sensor 22 can be zeroed at any time to ensure that the pressure measured by the pressure sensor 22 is more accurate. By changing the state of the switching valve 5, the connection between the pressure measuring chamber 211 and the vent 44 can be controlled at any time, and the zeroing operation is convenient.

[0032] The pressure measuring device also includes a ventilation mechanism 4 and a switching valve 5. The ventilation mechanism 4 includes a ventilation pipe 41, and a ventilation chamber 42 is provided inside the ventilation pipe 41. The switching valve 5 is a three-way valve and is located between the pressure measuring tube 21 and the syringe 3. The switching valve 5 has a switching valve body 51, and a switching valve chamber 52 is provided inside the switching valve body 51. A first channel port 511, a second channel port 512, and a third channel port 513 are provided outside the switching valve body 51. The inner ends of the first channel port 511, the second channel port 512, and the third channel port 513 are all connected to the switching valve chamber. The outer ends of the first channel port 511 and the third channel port 513 are respectively connected to the pressure measuring chamber 211 and the ventilation chamber 42.

[0033] By controlling the connection between the first channel port 511 and the third channel port 513, the pressure measuring chamber 211 and the ventilation chamber 42 can be connected to each other through the switching valve 5, so that the pressure sensor 22 in the pressure measuring chamber 211 can be connected to the atmosphere, and the pressure sensor 22 can be zeroed, which is convenient to operate.

[0034] like Figure 2As shown, the pressure measuring device also includes a syringe 3, which has an injection chamber 31 that is connected to the second channel port 512.

[0035] The pressure measuring tube 21 is located between the drainage tube 1 and the syringe 3, and the pressure measuring tube 21 connects the drainage tube 1 and the syringe 3. If a blood clot enters the pressure measuring chamber 211 and blocks the pressure sensor 22, physiological saline is injected into the injection chamber 31. The syringe 3 pressurizes the saline and sends it into the pressure measuring chamber 211, which can clear the blockage area and flush the pressure sensor 22, ensuring that the pressure sensor 22 can accurately measure the pressure.

[0036] In this embodiment, the first channel port 511 and the second channel port 512 are arranged opposite to each other, and the third channel port 513 is located between the first channel port 511 and the second channel port 512; by pressurizing with the syringe 3, physiological saline is sent into the pressure measuring chamber 211, which has a better effect on rinsing the pressure sensor 22.

[0037] The injection chamber 31 is filled with saline solution, and the syringe 3 uses a push-pull type infusion device, which makes it more convenient to use.

[0038] The switching valve 5 also includes a switching valve core 53, which is rotatably disposed in the switching valve chamber 52; the switching valve core 53 is provided with a switching inner plug, which can block any one of the first channel port 511, the second channel port 512 and the third channel port 513.

[0039] Rotating the switching valve core 53 allows for convenient adjustment of the state of the switching valve 5, making operation easy; switching the inner plug blocks the second channel port 512, connecting the first channel port 511 and the third channel port 513; switching the inner plug blocks the third channel port 513, connecting the first channel port 511 and the second channel port 512.

[0040] The ventilation mechanism 4 also includes an air filter 43, which has a bacteriostatic filter membrane to prevent bacteria and germs from entering the pressure measuring device; the outer end of the ventilation pipe 4 is provided with a vent 44, which is connected to the atmosphere, and the air filter 43 is located at the vent 44.

[0041] The ventilation chamber 42 is provided with a hydrophobic membrane 45, which divides the ventilation chamber 42 into two parts. Liquid will not flow out through the hydrophobic membrane 45, thus protecting the air filter 43.

[0042] The drainage tube 1 also includes a drainage valve 11, which is located at the connection between the drainage tube 1 and the pressure measuring tube 21. The drainage valve 11 is a three-way valve, and the drainage valve 11 has a drainage valve body 111. The drainage valve body 111 has a drainage valve cavity 112 inside, and a fourth channel port 113, a fifth channel port 114, and a sixth channel port 115 outside the drainage valve body 111. The inner ends of the fourth channel port 113, the fifth channel port 114, and the sixth channel port 115 are all connected to the drainage valve cavity 112. The outer ends of the fourth channel port 113 and the fifth channel port 114 are all connected to the drainage tube 1, and the outer end of the sixth channel port 115 is connected to the pressure measuring tube 21.

[0043] The drainage valve 11 also includes a drainage valve core 116, which is rotatably disposed within the drainage valve cavity 112. The drainage valve core 116 is provided with a drainage inner plug, which can block either the fourth channel port 113 or the fifth channel port 114. When the drainage inner plug blocks the fourth channel port 113, the fifth channel port 114 and the sixth channel port 115 are connected. When the drainage inner plug blocks the fifth channel port 114, the fourth channel port 113 and the sixth channel port 115 are connected.

[0044] like Figure 3 As shown, when the switching valve core 53 rotates, the switching inner plug blocks the first channel port 511, and the right end of the pressure measuring chamber 211 is closed, forming a stable pressure measuring space and ensuring the stable performance of the pressure sensor 2 in the pressure measuring chamber 211; when the drainage valve core 116 rotates, the drainage inner plug blocks the fifth channel port 114, and the fourth channel port 113 and the sixth channel port 115 are connected to each other. At this time, the cerebrospinal fluid in the drainage tube 1 stops flowing, and the pressure sensor 22 can accurately measure the intracranial pressure.

[0045] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A pressure measuring device for cerebrospinal fluid drainage, comprising a drainage tube, characterized in that, It also includes a pressure measuring mechanism, a ventilation mechanism, and a switching valve. The pressure measuring mechanism is equipped with a pressure measuring tube and a pressure sensor. The pressure measuring tube has a pressure measuring chamber, and the pressure sensor is located in the pressure measuring chamber. The ventilation mechanism includes a ventilation pipe with a vent at its outer end, which is connected to the atmosphere. The pressure measuring tube is located between the drainage pipe and the ventilation pipe, and its inner end is connected to the drainage pipe. The switching valve is located between the outer end of the pressure measuring tube and the ventilation pipe.

2. The pressure measuring device for cerebrospinal fluid drainage according to claim 1, characterized in that: The switching valve is provided with a switching valve body, the switching valve body is provided with a switching valve cavity, and the switching valve body is provided with a first channel port, a second channel port and a third channel port. The inner ends of the first channel port, the second channel port and the third channel port are all connected to the switching valve cavity. The outer ends of the first channel port and the third channel port are respectively connected to the pressure measuring chamber and the ventilation chamber.

3. The pressure measuring device for cerebrospinal fluid drainage according to claim 2, characterized in that: It also includes a syringe, which has an injection chamber that is connected to a second channel port; the first channel port is positioned opposite to the second channel port, and the third channel port is positioned between the first channel port and the second channel port.

4. The pressure measuring device for cerebrospinal fluid drainage according to claim 3, characterized in that: The injection chamber is filled with physiological saline.

5. The pressure measuring device for cerebrospinal fluid drainage according to claim 4, characterized in that: The syringe uses a push-pull type injector.

6. The pressure measuring device for cerebrospinal fluid drainage according to any one of claims 2 to 5, characterized in that: The switching valve further includes a switching valve core, which is rotatably disposed within the switching valve cavity; the switching valve core is provided with a switching inner plug, which can block any one of the first channel port, the second channel port, and the third channel port.

7. The pressure measuring device for cerebrospinal fluid drainage according to any one of claims 1 to 5, characterized in that: The ventilation mechanism also includes an air filter, which is located at the ventilation port.

8. The pressure measuring device for cerebrospinal fluid drainage according to claim 7, characterized in that: The ventilation duct is provided with a ventilation chamber, and the ventilation chamber is provided with a hydrophobic membrane; the ventilation chamber is connected to the ventilation port.

9. The pressure measuring device for cerebrospinal fluid drainage according to any one of claims 1 to 5, characterized in that: The drainage tube also includes a drainage valve, which is located at the connection between the drainage tube and the pressure measuring tube. The drainage valve has a drainage valve body, which has a drainage valve cavity. The drainage valve body has a fourth channel port, a fifth channel port, and a sixth channel port. The inner ends of the fourth, fifth, and sixth channel ports are all connected to the drainage valve cavity. The outer ends of the fourth and fifth channel ports are connected to the drainage tube, and the outer end of the sixth channel port is connected to the pressure measuring tube.

10. The pressure measuring device for cerebrospinal fluid drainage according to claim 9, characterized in that: The drainage valve also includes a drainage valve core, which is rotatably disposed within the drainage valve cavity; the drainage valve core is provided with a drainage inner plug, which can block any one of the fourth channel port, the fifth channel port, and the sixth channel port.

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