Syringe
First Claim
1. A a syringe comprising:
- (a) a plunger including a plunger head and a shaft;
(b) a barrel;
(c) a restrictor bobbin located between the shaft and the barrel and having an outer barb, tine, serration or the like engaged with the barrel and oriented so as to limit movement of the bobbin with respect to the barrel in a first direction;
(d) the restrictor bobbin and/or shaft carrying a formation for limiting movement of the bobbin with respect to the plunger in the said first direction;
(e) the bobbin being provided with a further barb, tine, serration or other formation oriented or arranged so as to restrict movement of the bobbin with respect to one of the barrel and plunger shaft in a second direction opposed to the first direction;
(f) a latch member for disabling the said restricting function of the further barb, tine, serration or other formation until a predetermined point in an operation cycle of the syringe.
1 Assignment
0 Petitions
Accused Products
Abstract
An auto-disable syringe is disclosed which prevents re-use of the syringe whetver dose is delivered on the first use. A restrictor bobbin comprises two elements: a plunger lock 1 and a barrel lock 20 which are relatively freely movable for a limited distance. The barrel lock includes a barb 27 which engages with the barrel interior wall to prevent proximal movement of the barrel lock, whilst the plunger lock includes a barb 6 which engages with the plunger to prevent distal movement of the plunger withy respect to the barrel lock. The plunger lock includes a further barb 9 which is engageable with the plunger to prevent proximal movement of the plunger. A lock release 40 inlcudes a latch tine 53 which, in the syringe as shipped, prevents engagement of the barb 9 with the plunger. After withdrawal of fluid, e.g. a liquid medicament, initial distal movement of the plunger causes the latch 53 to disengage with the barb 9, thereby preventing any further proximal movement of the plunger.
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Citations
10 Claims
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1. A a syringe comprising:
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(a) a plunger including a plunger head and a shaft;
(b) a barrel;
(c) a restrictor bobbin located between the shaft and the barrel and having an outer barb, tine, serration or the like engaged with the barrel and oriented so as to limit movement of the bobbin with respect to the barrel in a first direction;
(d) the restrictor bobbin and/or shaft carrying a formation for limiting movement of the bobbin with respect to the plunger in the said first direction;
(e) the bobbin being provided with a further barb, tine, serration or other formation oriented or arranged so as to restrict movement of the bobbin with respect to one of the barrel and plunger shaft in a second direction opposed to the first direction;
(f) a latch member for disabling the said restricting function of the further barb, tine, serration or other formation until a predetermined point in an operation cycle of the syringe. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification