Needle for subcutaneous delivery of fluids
US6261272A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 1999 |
| Grant date | Jul 17, 2001 |
| Priority date | — |
| Expiry date | Jun 1, 2019 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M5/2046
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A needle (10) for the delivery of a liquid to a subject comprises a shaft (11) having an internal surface defining a longitudinally extending internal bore open at one end (15) to receive a liquid supply, the other end (16) being sharpened for penetration of the skin of the subject. A plurality of apertures (18) are provided, each in the form of a cut extending across the external surface of the side of the shaft (11) at a sufficient depth to establish communication with the bore. The external aperture area is approximately three times greater than the internal aperture area, thereby ensuring that the liquid is delivered to a large surface area of tissue to improve absorption and eliminate fluctuations in the delivery rate. The needle (10) can be mass-produced by aligning a batch of shafts alongside one another and running a grinder across the surfaces of the shafts to create the apertures (18) in the entire batch of needles simultaneously.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.