In the drug delivery system, the design of the medical needle is critical as the part of the direct contact with the patient. The design of custom medical needle requires consideration of a variety of factors to ensure safe, effective, and comfortable drug delivery. This paper will discuss the design considerations of custom medical needle from four aspects.

Material Selection and Biocompatibility

The material selection of medical needles is directly related to their biocompatibility and patient safety. High-quality materials should have good biocompatibility and avoid causing allergic reactions or toxic reactions. Commonly used medical needle materials include stainless steel, Nitinol and so on. When selecting materials, it is also necessary to consider factors such as hardness, corrosion resistance and processing properties. In addition, with the deepening of the research of biomaterials, new biocompatible materials such as biodegradable polymers are gradually used in the manufacture of medical needles.

Size and Shape Optimization

The size and shape of medical needles have an important impact on the accuracy of drug delivery and patient comfort. During the design process, the appropriate needle diameter, length, and shape need to be selected based on factors such as the type of drug, delivery volume, and patient needs. For example, in situations where precise control of drug delivery is required, a fine-diameter needle can be used to reduce extravasation; For cases where deeper tissue needs to be punctured, a needle long enough to ensure the puncture is in place will need to be selected. In addition, the shape design of the needle also needs to consider the mechanical properties of the puncture and the pain of the patient.

Surface Treatment Technology

The surface treatment technology of medical needle is of great significance for improving puncture performance and reducing patient pain. Common surface treatment techniques include coating, lubrication treatment, etc. By applying biocompatible coating, the friction coefficient between needle and tissue can be reduced, and the resistance during puncture can be reduced. The lubrication treatment can make the liquid flow in the needle more smoothly and avoid blockage. In addition, there are some new surface treatment technologies, such as nano-coating, microneedles, etc., are gradually applied to the manufacture of medical needles.

In summary, the design of custom medical needle needs to consider many factors, including material selection, size and shape optimization, surface treatment technology and intelligent design. By taking these factors together, we can provide patients with safer, more effective and more comfortable drug delivery solutions.