Patent US20050004492A1 successfully refreshed from Google Patents.
EP0554995B1
Expired / Lapsed
EP
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Reusable medication delivery pen
Assignee: Becton Dickinson and Co
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Filing: 1993-01-25
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Granted: 1997-12-17
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Expires: 2013-01-25
Abstract
No abstract record available.
Inventors
- 👤 David Balkwill
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 04:52
CPC Classifications
A; A61; A61M; A61M5/00; A61M5/178; A61M5/31; A61M5/315; A61M5/31565; A61M5/31576; A61M5/31578; A61M5/3158; A61M5/31533; A61M5/31545; A61M5/31548; A61M5/3155; A61M5/31553; A61M2205/00; A61M2205/58; A61M2205/581; A61M5/24; A61M5/31535; A61M5/31541; A61M5/31543; A61M5/31566; A61M5/31568
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
343 words
An injection device (10) for injecting selected dosages of fluid, comprising; an elongate housing (20); a plunger (22) positioned at least partially within said housing (20); a lead screw (26) positioned at least partially within said plunger (22) and axially slidable therein; means for threadably engaging said lead screw (26); and means for securing a cartridge (46) for containing fluid to said housing (20), characterized by means for selectively moving said means for threadably engaging said lead screw (26) into and out of engagement with said lead screw (26), whereby said lead screw (26) is freely slidable with respect to said plunger (22) when said means for threadably engaging said lead screw (26) are disengaged from said lead screw (26), said lead screw (26) and plunger (22) being slidable as a unit with respect to said housing (20) when said means for threadably engaging said lead screw (26) are engaged with said lead screw (26); wherein said means for securing a cartridge (46) to said housing (20) is an elongate cartridge housing (18) having an end portion securable to said housing (20), said means for securing a cartridge (46) being engageable with said means for selectively moving such that said lead screw (26) is disengaged from said means for threadably engaging said lead screw (26) when said means for securing is disengaged from said housing (20), and wherein said means for threadably engaging said lead screw (26) includes a pair of at least partially threaded half nuts (28) positioned in opposing relation to each other within said housing (20) with the threaded portion of said half nuts (28) facing said lead screw (26), and said means for moving include a rotatable locking ring (30), said locking ring (30) including an internal wall defining a plurality of diameters, said half nuts (28) engaging said internal wall of said locking ring (30), said locking ring (30) being engageable with said cartridge housing (18) such that rotation of said cartridge housing (18) causes rotation of said locking ring (30) with respect to said half nuts (28).
Claim 2
Dependent Claim
25 words
A device (10) as defined in Claim 1 including means for resiliently urging said locking ring (30) and half nuts (28) in opposing axial directions.
Claim 3
Dependent Claim
20 words
A device (10) as defined in Claim 2 including means for urging an end of each half nut radially inwardly.
Claim 4
Dependent Claim
38 words
A device (10) as defined in Claim 3 wherein said half nuts (28) are coupled to said plunger (22) such that said half nuts (28) and said plunger (22) are slidable as a unit within said housing (20).
Claim 5
Dependent Claim
25 words
A device (10) as defined in Claim 4 including means for abutting said half nuts (28) at a selected axial position within said housing (20).
Claim 6
Dependent Claim
105 words
A device (10) as defined in Claim 5 wherein said plunger (22) includes a band of radially extending ribs (22b), said band including a first end portion which abuts against said half nuts (28) and a second end portion, said means for abutting said half nuts (28) including a spring (30) member mounted within said housing (20), said spring (30) member abutting against said half nuts (28) when said plunger (22) is in a first axial position with respect to said housing (20) and abutting against the second portion of said band of ribs (22b) when said plunger (22) is in a second axial position.
Claim 7
Dependent Claim
51 words
An injection device (10) as defined in any preceding Claim further including an elongate fluid-containing cartridge (46) having an internal piston (46b) at its proximal end (50c) and pierceable seal (46a) at its distal end (50b) defining a reservoir for said fluid, said cartridge (46) being secured to said housing (20).
Claim 8
Dependent Claim
114 words
An injection device (10) as defined in Claim 7 further comprising a needle assembly (50) including an elongate cannula (50a) and a cup-shaped hub (50d), said cannula (50a) having a sharp proximal end (50c), a sharp distal end (50b) and a lumen therethrough, said cup-shaped hub (50d) holding said cannula (50a) so that said sharp proximal end (50c) of said cannula (50a) projects outwardly from the interior of said cup-shaped hub (50d), said needle assembly (50) being removably attached to said device (10) so that said sharp proximal end (50c) pierces said pierceable seal (46a) of said cartridge (46) so that said lumen is in fluid communication with the fluid in said cartridge (46).
References Cited (Backward Citations)
No citation records indexed.
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