Glass infusion devices, also known as glass perfusion devices or glass applicators, are essential tools in various medical and industrial applications. These devices typically consist of two glass barrels, each approximately 7–8 mm thick and 35 mm long, connected by a central glass tube. The outer casing and the mandrel are made from glass syringes, with the mandrel’s head featuring a round opening of about 2–3 mm.
The sealing and wear resistance of these glass applicators have been widely discussed among professionals. However, due to my limited ability to express technical details clearly, I will only share some observations. I hope that experienced engineers and technicians can provide more valuable insights.
In practice, many glass applicators used by companies today suffer from issues like poor sealing, leakage, and difficulty in wearing. Some may even blame the powder on the lamp or other factors. But the truth is often hidden. The root cause of these problems usually lies in the syringe itself.
Originally, hospitals used glass syringes extensively, and there were numerous manufacturers across China, such as the Shanghai Glass Factory, Beijing Glass Factory, and Tianjin Glass Factory. With the rise of disposable syringes, the demand for glass syringes has significantly decreased. Previously, they were made from "August 1st" material, which was later replaced by 17-gram and medium-sized materials around 1997 and 1998.
Today, you can find various brands on the market—like flying pigeons, petrels, chrysanthemums, and northern-style syringes—but the brand name doesn’t always reflect the quality. The key factor is still the material. Here's a simple way to identify the material: place the applicator on a white sheet of paper. If it looks white, it’s likely not made from 17-gram or medium-sized material. If it appears dark yellow, it could be the original August 1st material.
However, there are counterfeits or partial truths out there. For example, the outer shell might be August 1st material, while the inner mandrel is medium-sized, or vice versa. Some Bayi (August 1st) syringes are actually well-sealed, and there are ways to distinguish them—though those methods are currently kept confidential.
Currently, most Bayi materials are in stock, especially at the bottom of the boxes. It's rare to find high-quality ones these days. We still have a small inventory, including some 75-year-old syringes produced by the Shanghai Syringe Factory. If you're interested, feel free to exchange ideas and discuss further.
Next time, we’ll talk about glass pistons.
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