Intravenous needle assembly with air bleed plug
US4193400A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 16, 1978 |
| Grant date | Mar 18, 1980 |
| Priority date | — |
| Expiry date | Jun 16, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S604/90
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An intravenous needle assembly and an associated manufacturing method, wherein the needle assembly comprises a hypodermic needle attached to a hub at its trailing end, a transparent blood detection chamber integral with the hub, a catheter disposed around the needle and the needle hub and a plug closing the blood detection chamber, the plug having air breathing means so that upon venipuncture blood from a vein may flow through the needle into the blood detection chamber without substantial air resistance to such flow to visually confirm the accuracy of the introduction of the needle into a vein. The plug is centrally hollow and has an axially directed leading breather projection connected to an annular shoulder or flange. The breather projection comprises a symmetrical hollow truncated conical extension with a hollow interior and walls having a plurality of narrow slits permitting ready passage of air under pressure of the heart while substantially preventing the passage of blood through the slits. The slits are preferably formed during molding of the plug, using molds wherein the apexes of a male mold are made to line contact the inner conical surface of a female mold to form each…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.