Injection device
First Claim
1. An injection device including:
- a housing for containing a syringe having a bore extending from an end surface, a needle communicating with the bore through the end surface and a dispensing piston movable in said bore towards said end surface so as to expel the contents of the syringe through the needle, the housing having an opening at one end through which the needle may extend;
a resilient member for biassing the syringe and needle inwardly of the housing;
a drive element movable towards said one end so as to move the needle of the syringe out of the opening and to move the dispensing piston of the syringe towards the end surface;
a mechanism operable to release the syringe such that the needle moves inwardly of the housing;
a drive coupling for extending from said drive element to the dispensing piston of the syringe so as to transfer movement of said drive element to the dispensing piston;
wherein the drive coupling is compressible in length such that, after the drive element has moved the dispensing piston to the end surface, the drive coupling gradually reduces in length whilst the dispensing piston is maintained at the end surface until said mechanism releases the syringe.
4 Assignments
0 Petitions
Accused Products
Abstract
An injection device for use with a syringe (30) having a bore (32) extending from an end surface (34), a needle (36) communicating with the bore through the end surface and a dispensing piston (38) movable in said bore towards said end surface so as to expel the content of the syringe through the needle, the injection device including a housing (60) having an opening (64) at one end through which the needle may extend, a resilient member for biassing the syringe and needle inwardly of the housing, a drive element (66) movable towards said one end so as to move the needle of the syringe out of the opening against the bias of the resilient member and to move the dispensing piston of the syringe towards the end surface, a delatch mechanism (72) operable to release the syringe such that the needle moves inwardly of the housing, a drive coupling (40) for extending from said drive element to the dispensing piston of the syringe so as to transfer movement of said drive element to the dispensing piston, wherein the drive coupling gradually reduces in length such that, after the drive element has moved the dispensing piston to the end surface, the drive element continues to move to said predetermined piston to the end surface, the drive element continuous to move to said predetermined position at which said delatch mechanism releases the syringe.
83 Citations
54 Claims
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1. An injection device including:
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a housing for containing a syringe having a bore extending from an end surface, a needle communicating with the bore through the end surface and a dispensing piston movable in said bore towards said end surface so as to expel the contents of the syringe through the needle, the housing having an opening at one end through which the needle may extend;
a resilient member for biassing the syringe and needle inwardly of the housing;
a drive element movable towards said one end so as to move the needle of the syringe out of the opening and to move the dispensing piston of the syringe towards the end surface;
a mechanism operable to release the syringe such that the needle moves inwardly of the housing;
a drive coupling for extending from said drive element to the dispensing piston of the syringe so as to transfer movement of said drive element to the dispensing piston;
whereinthe drive coupling is compressible in length such that, after the drive element has moved the dispensing piston to the end surface, the drive coupling gradually reduces in length whilst the dispensing piston is maintained at the end surface until said mechanism releases the syringe. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
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22. An injection device including:
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a housing for containing a syringe having a bore extending in a syringe body from an end surface, a needle communicating with the bore through the end surface and a dispensing piston movable in said bore towards said end surface so as to expel the contents of the syringe through the needle, the housing having an opening at one end through which the needle may extend;
a resilient member for biassing the syringe and needle inwardly of the housing;
a drive element movable towards said one end so as to move the needle of the syringe out of the opening and to move the dispensing piston of the syringe towards the end surface;
a drive coupling for extending from said drive element to the dispensing piston of the syringe so as to transfer movement of said drive element to the dispensing piston; and
an engagement for transferring drive directly from the drive coupling to the syringe body such that movement of the drive element towards said one end causes no relative movement of the dispensing piston in the syringe;
whereinthe engagement is releasable once the needle of the syringe extends out of the opening such that movement of the drive element towards said one end causes relative movement of the dispensing piston in the syringe body. - View Dependent Claims (45, 46, 47, 48, 49, 50, 51, 52, 53, 54)
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Specification