In today's clinical medical field, the application of intravenous catheters is extremely common and has become the preferred method for clinical infusion. It brings many significant advantages, effectively reducing the pain caused by repeated scalp needle punctures for infants and young children; For adults who receive long-term intravenous infusion, the torment of repeated needle insertion is also avoided. At the same time, intravenous catheters greatly reduce the workload of clinical nurses and improve nursing efficiency.

However, intravenous catheters come into direct contact with human skin and blood, and their quality and safety are directly related to the patient's life and health. Our country's Food and Drug Administration has increased the management of pharmaceutical packaging talents, especially the management of pharmaceutical packaging materials. It is explicitly required that the hard straight stainless steel needle tubes used in medical devices must have a certain degree of rigidity. This is because there is a risk of breakage during the injection process of a non compliant rigid intravenous catheter. Once it breaks, it is highly likely to cause secondary harm to the patient, and the consequences are unimaginable. The country has also formulated relevant standards and put forward clear requirements for the rigidity detection indicators of intravenous catheters. So, how to detect the rigidity of a venous catheter? The answer is to use a professional rigidity tester.

The unique advantages of the rigidity tester

The rigidity tester plays a crucial role in the rigidity detection of venous indwelling needles. It can not only accurately detect the rigidity of intravenous catheters, but also has user level permission management function. This function can effectively standardize the operating permissions of different users on the instrument, ensure the security and confidentiality of data, and prevent data from being tampered with or leaked at will. At the same time, it can also ensure the integrity and standardization of data, saving detailed and accurate testing data for medical device manufacturers. These data are not only a visual reflection of product quality, but also an important basis for manufacturers to trace quality and improve production processes.

Detailed explanation of the detection method of the rigidity tester

1. Sample preparation

Firstly, an appropriate amount of stainless steel needle separated from the glass needle tube needs to be taken as the test sample. This step may seem simple, but it is crucial because the quality and condition of the sample directly affect the accuracy of the test results. Only by selecting representative samples that meet the requirements can we ensure that the test results truly reflect the rigidity of the intravenous catheter.

2. Instrument settings

Place the prepared stainless steel needle on the ZG-D medical needle tube rigidity tester. Next, we need to perform a series of detailed settings on the instrument. The push rod requires a force of approximately 60N (accuracy: ± 0.1N) to be applied, and it should act vertically downward on the needle tube. There are strict requirements for the magnitude and accuracy of this force, as too small or too large a force cannot accurately detect the rigidity of the needle tube, and insufficient accuracy can lead to significant errors in the detection results.

The lower end structure of the force push rod is also very special, consisting of a mold with a 60 ° angle to each other and a cylindrical surface with a curvature radius of 1mm. The width of the push rod is at least 5mm. This design is to ensure uniform and stable force application, and to accurately simulate the force experienced by the needle tube during actual use. At the same time, the displacement measurement accuracy of the instrument is 0.01mm, which can accurately measure the deformation of the needle after being subjected to force. In addition, it is necessary to adjust the test bracket to ensure that its span meets the standard requirements, providing stable support for subsequent testing.

3. Testing process

Align the lower end of the force push rod with the middle of the sample, which is a key step to ensure the accuracy of the detection. If the alignment is not accurate, the point of application will shift, resulting in distorted detection results. After the alignment is completed, apply the standard bending force to the needle tube downwards through the force push rod at a rate of 10mm/min. In this process, it is necessary to closely observe the deformation of the needle tube and use instruments to accurately measure and record the deflection of the needle tube at the point of application, accurate to 0.01mm. This deflection value is the rigidity index we need to test, and the rigidity of each stainless steel needle must meet the standard requirements.

Overall, the rigidity testing of intravenous catheters is a rigorous and important task, which directly affects the safety of patient use and the quality level of medical equipment. The rigid testing instrument provides reliable technical support for the quality inspection of intravenous catheters with its precise detection capability and comprehensive data management functions. By strictly following the above testing methods, we can ensure that every intravenous catheter meets the national standard requirements and safeguard the health of patients.