Patent ID: 11857768
Assignee: CARRTECH CORP.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 16:
17. A method for making a filtered needle assembly unable to work with a second hollow needle, the method comprising:
loading a syringe with a liquid payload through the filtered needle assembly (100);
removing a first distal tip (154) of a first hollow needle (150) attached to the syringe from an open proximal end (208) of the filtered needle assembly;
subsequently, inserting a second distal tip (154) of the second hollow needle (150) into the open proximal end (208) of the filtering needle assembly;
advancing the second distal tip of the second hollow needle through a proximal chamber (212) of the filtering needle assembly and into a hollow interior (316) of a seal plug (300);
advancing the second distal tip of the second hollow needle distally until contact with the seal plug pushes the seal plug distally within a distal chamber (230) of the filtering needle assembly without the second distal tip traversing the seal plug; and
failing to easily draw liquid into the second hollow needle as the second distal tip of the second hollow needle is not in the distal chamber as the second distal tip of the second hollow needle could not pass through the seal plug without a holding tool (500) holding the seal plug against an annular shoulder (220) at a distal end of the proximal chamber (212).