US 5,304,152 AGranted

Dispensing device

OwnerBernard Samsinventor

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Abstract

A dispensing device has a shell (11) which may be connected to a container (14) for a fluid to be dispensed, such as an injectable pharmaceutical compound. The device has a fixed first threaded member (21) and a second threaded member (22) surrounding the first member, the first and second members each having equi-spaced threaded segments (27 and 29) with non-threaded segments (28) therebetween whereby the second member will be wound axially when rotated about the first member but may be positioned for axial sliding movement with respect to the first member. A plunger (23) is slidably mounted within the first member (21) and has a portion (33) engageable with the threads of the second member. A dose setting sleeve (53) surrounds the second member and has threads (54) engaged with the device shell, the sleeve being coupled to the second member for rotation therewith. A dose is set by winding the second member (22) away from a fixed stop (25) until the sleeve (53) indicates the required does amount, whereafter the second member (22) is slid axially back to the fixed stop (25), the plunger (23) being thrust forwardly thereby to expel fluid from the container.

Claims14

Dependent claims

A device for dispensing controlled doses of fluid from a container having a piston movable axially in increments thereby to dispense doses of fluid from an outlet of the container, which device comprises a main body having at one end means to connect the device to a container, a plunger mounted for sliding movement within said main body and engageable with the container piston, a fixed stop disposed within the main body adjacent the container connection means and a dose setting and dispensing arrangement disposed within the main body and having first and second threaded members, the first member being fixed in relation to the main body and the second member being mounted for rotation about the first member and having threads engageable with those of the first member, said plunger being mounted within the first member for sliding movement with respect to the main body and having a portion engageable with the threads of the second member, and the second member being rotatable to any one of a plurality of settings where its threads are engaged with said portion of the plunger but free of the first member whereby the second member and plunger may slide axially relative to the first member, movement of the second member in a direction towards the container connection means being limited by said fixed stop, the device further comprising dosage indicator means connected to the second member and arranged to indicate an ascending series of measured doses as the second member is rotated to move along the threads of the first member away from said fixed stop whilst the plunger remains stationary, and for each indicated dose the second member is disposed in one of its said settings relative to the first member where axial movement of the second member is permitted, the second member during such movement driving the plunger to act on the piston of a connected container and the dose expelled thereby being controlled by the axial distance of travel of the second member to the fixed stop from the position to which said member has been turned to indicate a desired dose.

A medication dispensing device comprising:

(i) a body defining
a) a chamber for receiving a container for fluid, which container has an outlet and a piston movable axially in increments thereby to dispense doses of fluid through said outlet;
and
b) support means for a dispensing needle which when supported thereby communicates with said outlet of said container;
and
(ii) dispensing means provided within said body for dispensing controlled doses of fluid from a received container through a supported needle, which dispensing means comprises:
a) a plunger mounted for sliding movement within said body and engageable with said piston of a received container;
b) a first member disposed within and fixed in relation to said body and threaded externally with a plurality of equi-spaced threaded arcuate sectors separated by a like plurality of non-threaded sectors;
c) a second member mounted for rotation about said first member and having internal threaded and non-threaded sectors arranged in essentially the same configuration as that of the first member, the threaded sectors of the second member being engageable with the threaded sectors of the first member, said plunger being slidably mounted within the first member and having a portion engageable with the threads of the second member, and the second member being rotatable to any one of a plurality of settings where one of the threaded sectors thereof is engaged with said portion of the plunger but all of the threaded sectors of said second member are free of the threaded sector of the first member whereby both the second member and plunger may slide axially relative to the first member;
d) a fixed stop provided on the body adjacent said chamber and arranged to limit sliding movement of the second member in a direction towards a received container;
and
e) dosage indicator means connected to said second member and arranged to indicate an ascending series of measured doses as the second member is rotated to be screwed along the threads of the first member away from the said fixed stop whilst the plunger remains stationary, the second member being disposed in one of its said settings relative to the first member where axial movement of the second member is permitted for each indicated dose, the second member during such axial movement driving the plunger to act on the piston of a received container and the dose expelled thereby being controlled by the axial distance of travel of the second member to said fixed stop from the position to which said member had been set by rotation, to indicate a desired dose.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 07/773,610Filed 27 Nov 1991
Priority: GB 900711329 Mar 1990
Granted: 19 Apr 1994
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

A61M 5/31553
By rotational movement of dose setting member, e.g. during setting or filling of a syringe: without axial movement of dose setting member
A61M 5/3158
The piston rod being moved by the axial movement of a component directly in contact with it: the component being manually operated or triggered by…
A61M 5/31511
Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing…:…
A61M 5/31541
Means improving security or handling thereof, e.g. blocking means, means preventing insufficient dosing, means allowing correction of overset…