Auto-injection device
The present invention relates to an autoinjector device ( 10 ) for use in combination with a syringe ( 30 ), said syringe comprising a movable plunger; a needle; and a tubular needle shield ( 34 ). The claimed autoinjector device ( 10 ) comprises: an elongated housing having a proximal ( 11 ) and a distal end ( 12 ); a drive mechanism; a syringe holder ( 40 ) in order to support the fragile syringe and to prevent damage to the syringe. The invention furthermore relates to a method for assembly of the autoinjector device according to the invention.
1. An auto-injector device, elongated along a longitudinal axis and having a proximal end and an opposing distal end, the device comprising
a syringe having a substantially circular cross section with an outer diameter, a proximal end, a neck, a distal end with a flange radially extending from an outer periphery of a container, a movable plunger, a needle, and a tubular needle shield having an outer diameter that is larger than the outer diameter of the syringe;
an elongated auto-injector housing, comprising a space for the syringe; and
a syringe holder having a syringe holder wall with a substantially tubular shape, the syringe holder wall having:
an open distal end with a distal supporting collar arranged around an outer periphery of the syringe holder wall to support the syringe by the flange,
an open proximal end with a proximal supporting collar arranged around an inner periphery of the syringe holder wall to support the syringe neck, wherein the proximal supporting collar is configured to flex radially outward to allow the tubular needle shield to pass through when the syringe is longitudinally mounted in the syringe holder, and
a slot extending from the open proximal end in a distal direction, resulting in a C-shaped cross sectional shape of the syringe holder wall in the proximal end;
wherein the outer periphery of the proximal end of the syringe holder is radially supported by at least one contact surface of the auto-injector housing when the syringe holder is in a proximal and secured position within the auto-injector housing, and wherein the auto-injector housing prevents the proximal supporting collar from flexing radially outward when the syringe holder is in the proximal and secured position within the auto-injector housing, thereby restraining the syringe within the syringe holder.
2. The auto-injector device of claim 1 , wherein the proximal supporting collar has an inner diameter that is less than the outer diameter of the syringe.
3. The auto-injector device of claim 1 , wherein the proximal supporting collar has an inner diameter that is less than the outer diameter of the tubular needle shield.
4. The auto-injector device of claim 1 , wherein the syringe holder wall has a longitudinal length between the proximal supporting collar and the distal supporting collar corresponding to a length of the syringe such that the distal supporting collar supports the flange and the proximal supporting collar supports the neck simultaneously when a force is applied to the movable plunger.
5. The auto-injector device of claim 4 , wherein the proximal supporting collar has an inner diameter that is less than the outer diameter of the syringe.
6. The auto-injector device of claim 4 , wherein the proximal supporting collar has an inner diameter that is less than the outer diameter of the tubular needle shield.
7. The auto-injector device of claim 1 , wherein the syringe holder further comprises at least one protrusion to control movement of the syringe holder within the housing when the syringe holder is longitudinally mounted in the housing.
8. The auto-injector device of claim 7 , wherein the at least one protrusion comprises a number of protrusions along the outer periphery of the syringe holder wall, and wherein the auto-injector housing comprises a number of corresponding grooves along the inner periphery of the housing.
9. The auto-injector device of claim 1 , comprising a number of corresponding openings on the housing and on the syringe holder.
10. The auto-injector device of claim 1 , wherein the syringe holder comprises a fastener for securing the syringe holder in relation to the housing when the syringe holder is longitudinally mounted in the housing.
11. The auto-injector device of claim 1 , wherein the syringe holder is movably arranged in a proximal section of the housing between a distal position, in which the syringe may be inserted through the open distal end, and the proximal position.
12. A method of assembling a syringe in an auto-injector device according to claim 1 , comprising:
a) inserting the proximal end of the syringe in the distal end of the syringe holder;
b) moving the syringe toward the proximal end of the syringe holder until the neck is in contact with the proximal supporting collar and the flange is in contact with the distal supporting collar of the syringe holder; and
c) moving the syringe holder and the syringe toward the proximal end of the auto-injector device.