Cartridge and rod for axially loading medication pump
US7033338B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 28, 2002 |
| Grant date | Apr 25, 2006 |
| Priority date | — |
| Expiry date | Aug 15, 2022 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2207/00
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The present invention concerns a medication pump, a cartridge for use in a medication pump, a pump cap for use with a medication pump, components of the cartridge and methods of use of these devices. A cartridge includes a plunger having a tab that projects from an interior wall of the plunger. The tab can be used to lock the plunger into engagement with a drive rod of the pump. The drive rod defines a channel for receiving the tab of the plunger, where the channel includes an axial portion disposed parallel to an axis of the drive rod and a locking portion disposed in a circumferential direction around an outer surface of the drive rod. A similar channel structure can be provided on a removable fill rod used while filling the cartridge. The cartridge axially inserted into a cartridge chamber and then is rotated into engagement with the drive rod. The cartridge may also include axial guides at one end that interface with a guides on pump cap. When the pump cap is rotated into engagement with the pump, the interacting guides cause the cartridge to be rotated into engagement with the drive rod.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.