VOC (volatile organic compound) test pretreatment sampling device for respiratory gas passage type medical equipment
By combining a nitrogen generator and a gas distribution tube with a constant temperature incubator, the problems of gas source interference and multiple sample collection in VOC testing of respiratory gas pathway medical devices were solved, achieving efficient and accurate test results.
Patent Information
- Application Number
- CN202422907774.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-27
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2034-11-27
AI Technical Summary
Existing VOC emission testing for respiratory gas pathway medical devices suffers from problems such as significant gas source interference, high cost, complex operation, and difficulty in simultaneously collecting multiple parallel samples, resulting in low testing efficiency and unreliable results.
A nitrogen generator was used to provide high-purity nitrogen as the gas source. The gas was then connected to a constant temperature incubator via a gas distribution pipe to enable the synchronous collection of multiple parallel samples and blank samples. The consistency of the nitrogen flow rate was controlled by a main flow meter and a branch flow meter to ensure the stability of the test conditions.
It improved testing efficiency, reduced costs, simplified operating procedures, and enhanced the accuracy and reliability of testing.
Smart Images
Figure CN223526084U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to volatile organic compound detection technical field, concretely relates to a kind of breath gas passage class medical instrument VOC test pretreatment sampling device. BACKGROUND
[0002] At present, VOC emission test of breath gas passage class medical instrument is the key link in product quality and safety evaluation.The conventional pre-test processing method usually uses customized test bin or atmospheric sampling bag with flowmeter, and detects the equipment by air source;Because air is mixed gas, the air blank interference is larger, and the customized test bin or atmospheric sampling bag makes the cost of whole detection higher, and the operation is complex;And the existing test device can only carry out limited sample test, it is difficult to synchronously collect multiple parallel samples, so as to improve test efficiency, and ensure the reliability of test result. UTILITY MODEL CONTENT
[0003] The utility model solves the technical problem of the prior art, and provides a breath gas passage class medical instrument VOC test pretreatment sampling device, which can synchronously collect multiple parallel samples, effectively improve test efficiency and ensure the reliability of test results.
[0004] The utility model adopts the technical scheme: a breath gas passage class medical instrument VOC test pretreatment sampling device, which comprises a nitrogen generator and a constant-temperature incubator, the nitrogen generator is connected with a main gas pipe at the gas outlet end, the main gas pipe is provided with a main flowmeter, the gas outlet end of the main gas pipe is connected with a plurality of branch gas pipes through a shunt pipe, a branch flowmeter is installed on each branch gas pipe, the gas outlet end of the branch gas pipe extends into the constant-temperature incubator, a plurality of collection interfaces corresponding to the branch gas pipes are arranged on one side of the constant-temperature incubator, and the collection interfaces are connected with collectors through collection pipes.
[0005] Preferably, the end of the branch gas pipe extending into the constant-temperature incubator is provided with a connecting interface.
[0006] Preferably, the connecting interface and the collection interface are made of polytetrafluoroethylene.
[0007] Preferably, the main gas pipe, the shunt pipe, the branch gas pipe and the collection pipe are made of inert materials.
[0008] Preferably, the branch gas pipe is provided with at least four.
[0009] Preferably, the collector is an adsorption tube or an atmospheric sampler.
[0010] The utility model has the advantages of:
[0011] (1) Using a nitrogen generator to provide high-purity nitrogen as a gas source avoids the gas switching and temperature instability problems that are prone to occur in test chambers and gas cylinders.
[0012] (2) Multiple parallel samples and blank samples can be collected simultaneously through the gas splitting tube, which effectively improves the testing efficiency.
[0013] Compared with traditional test chambers, this invention is suitable for testing volatile organic compound emissions from various respiratory gas pathway medical devices, effectively improving the accuracy and reliability of the test, simplifying the operation process, and reducing the test cost. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of this utility model.
[0015] In the diagram: 1. Nitrogen generator; 2. Constant temperature incubator; 3. Main gas supply pipe; 4. Main flow meter; 5. Diverter pipe; 6. Diverter pipe; 7. Diverter flow meter; 8. Data acquisition interface; 9. Data acquisition device; 10. Connection interface. Detailed Implementation
[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.
[0017] Example
[0018] like Figure 1 As shown, the VOC testing pretreatment sampling device for respiratory gas pathway medical devices provided in this embodiment includes a nitrogen generator 1 and a constant temperature incubator 2.
[0019] Nitrogen generator 1 provides nitrogen with a purity greater than 99% as a gas source, which can effectively avoid interference from organic matter or impurities in the ambient air to the sampling, and also avoid the problems of gas switching and temperature instability.
[0020] The constant temperature incubator 2 is an existing mature product, which is mainly used to place the test sample and control the temperature required for the test, so as to ensure that the sample is collected under constant temperature conditions and avoid fluctuations in the rate of release of volatile organic compounds from the test sample due to temperature changes, thereby ensuring the consistency of the test results.
[0021] The gas outlet end of the nitrogen generator 1 is connected with a main gas conveying pipe 3, a main flow meter 4 is installed on the main gas conveying pipe 3, the gas outlet end of the main gas conveying pipe 3 is connected with several branch gas pipes 6 through a branch flow pipe 5, in the embodiment, five branch gas pipes 6 are arranged, three of which are used for three parallel samples, and two of which are used for blank samples; a branch flow meter 7 is installed on each branch gas pipe 6 respectively, the gas outlet end of the branch gas pipe 6 extends into the constant temperature incubator 2 and is connected with a connecting interface 10, a plurality of collecting interfaces 8 corresponding to the branch gas pipes 6 are arranged on one side of the constant temperature incubator 2, the collecting interfaces 8 are connected with collectors 9 through collecting pipes outside, and the collectors are adsorption pipes or atmospheric samplers;
[0022] The connecting interface 10 and the collecting interface 8 are both made of polytetrafluoroethylene; and the main gas conveying pipe 3, the branch flow pipe 5, the branch gas pipes 6 and the collecting pipes are all made of inert materials.
[0023] The nitrogen flow input into each branch gas pipe 6 is strictly controlled to be consistent through the main flow meter 4 and the branch flow meter 7, so that the collecting consistency of the three parallel samples and the two blank samples is ensured.
[0024] In use, five same to-be-tested samples are placed in the constant temperature incubator 2, the gas inlets of the to-be-tested samples are sealingly connected with the connecting interface 10, the gas outlets are sealingly connected with the collecting interfaces 8, the constant temperature incubator 2 is closed, the constant collecting temperature is adjusted, the nitrogen generator 1 is opened, the total nitrogen amount input is controlled through the main flow meter 4, the nitrogen amount input into each branch gas pipe 6 is controlled through each branch flow meter 7, the nitrogen amount input into each branch gas pipe 6 into the constant temperature incubator 2 is strictly ensured to be consistent, the nitrogen enters the gas passage of the to-be-tested sample, the to-be-tested sample releases volatile organic compounds at the constant temperature, the released volatile organic compounds enter the collectors 9 along with the nitrogen and are collected by the collectors 9, so that the sampling is completed.
[0025] The above only describes preferred embodiments of the present application, but the protection scope of the present application is not limited thereto, any modification and replacement based on the technical scheme and the application concept provided by the present application should be covered in the protection scope of the present application.
Claims
1. A VOC pre-treatment sampling device for respiratory gas pathway medical devices, characterized by: It comprises a nitrogen generator (1) and a constant temperature incubator (2), the outlet of the nitrogen generator (1) is connected with a main gas pipe (3), the main gas pipe (3) is provided with a main flow meter (4), the outlet of the main gas pipe (3) is connected with several branch gas pipes (6) through a branch pipe (5), each branch gas pipe (6) is provided with a branch flow meter (7), the outlet of the branch gas pipe (6) extends into the constant temperature incubator (2), one side of the constant temperature incubator (2) is provided with several collecting interfaces (8) corresponding to the branch gas pipes (6), the collecting interfaces (8) are connected with collectors (9) through collecting pipes.
2. The pre-treatment sampling device for VOC testing of respiratory gas pathway medical devices of claim 1, wherein: The end of the branch gas pipe (6) extending into the constant temperature incubator (2) is provided with a connecting interface (10).
3. The pre-treatment sampling device for VOC testing of respiratory gas pathway medical devices of claim 2, wherein: The connecting interface (10) and the collecting interface (8) are made of polytetrafluoroethylene.
4. The pre-treatment sampling device for VOC testing of respiratory gas pathway medical devices of claim 1, wherein: The main gas pipe (3), the branch pipe (5), the branch gas pipe (6) and the collecting pipe are made of inert materials.
5. The pre-treatment sampling device for VOC testing of respiratory gas pathway medical devices of claim 1, wherein: The branch gas pipe (6) is provided with at least four.
6. The pre-treatment sampling device for VOC testing of respiratory gas pathway medical devices of any of claims 1-5, wherein: The collector (9) is an adsorption pipe or an atmospheric sampler.