Injection device with a cocking element and a second setting element
First Claim
1. An injection device for performing dosed injections, said injection device defining a proximal end and a distal end and havingan elongated housing (30, 32) for reception of an ampule or medication container (12) retaining a medicinal fluid,said ampule including a fluid expelling piston (17) movable in proximal direction within the ampule and having means for reception of an injection needle (16) engageable with the proximal end of the ampule and movable with the ampule in proximal direction with respect to the housing in an injecting direction;
- an injection plunger or tappet (18) engageable against said piston (17);
a plunger length setting mechanism (62) coupled to said plunger and forming with said plunger an injection dosing arrangement (18-22).said plunger setting mechanism having two relatively rotatable parts, one of which is formed by said plunger (18), and means (40, 70, 71,
100) for selectively preventing relative rotation of one of said parts with respect to said housing;
a spring (105) coupled to the injection dosing arrangement (18-62);
user operable spring cocking means (74);
user operable spring release means (11,
53),said spring (105), after cocking, moving the injection dosing arrangement (18-62) upon release by the spring release means (11-53) longitudinally in the housing for engagement of said plunger (18) with said piston (17) to expel medicament fluid from the injection needle, and comprisinglocking means (100) operatively associated with said plunger length setting mechanism (18,
62) and effective only when said plunger length setting mechanism is in a distal terminal position, and to permit rotation of the other (62) of said parts relative to the housing only in a predetermined direction (FIG. 15;
128) with respect to the housing while inhibiting rotation in reverse direction, said locking means being ineffective when said plunger length setting mechanism is in a terminal proximal position.
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Accused Products
Abstract
The injection device described comprises a loading element (74) which can be moved longitudinally for loading purposes and is rotatable for the purpose of setting the injection dose. Associated with this loading element (74) is a second setting element (86). The latter allows a judicious internal combination of the information supplied by the position of the loading element (74) and of the second setting element (86). The patient can effect several individually-dosed injections from a single container.
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Citations
22 Claims
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1. An injection device for performing dosed injections, said injection device defining a proximal end and a distal end and having
an elongated housing (30, 32) for reception of an ampule or medication container (12) retaining a medicinal fluid, said ampule including a fluid expelling piston (17) movable in proximal direction within the ampule and having means for reception of an injection needle (16) engageable with the proximal end of the ampule and movable with the ampule in proximal direction with respect to the housing in an injecting direction; -
an injection plunger or tappet (18) engageable against said piston (17); a plunger length setting mechanism (62) coupled to said plunger and forming with said plunger an injection dosing arrangement (18-22). said plunger setting mechanism having two relatively rotatable parts, one of which is formed by said plunger (18), and means (40, 70, 71,
100) for selectively preventing relative rotation of one of said parts with respect to said housing;a spring (105) coupled to the injection dosing arrangement (18-62); user operable spring cocking means (74); user operable spring release means (11,
53),said spring (105), after cocking, moving the injection dosing arrangement (18-62) upon release by the spring release means (11-53) longitudinally in the housing for engagement of said plunger (18) with said piston (17) to expel medicament fluid from the injection needle, and comprising locking means (100) operatively associated with said plunger length setting mechanism (18,
62) and effective only when said plunger length setting mechanism is in a distal terminal position, and to permit rotation of the other (62) of said parts relative to the housing only in a predetermined direction (FIG. 15;
128) with respect to the housing while inhibiting rotation in reverse direction, said locking means being ineffective when said plunger length setting mechanism is in a terminal proximal position. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An injection device for performing dosed injections, said injection device defining a proximal end and a distal end and having
an elongated housing (30, 32) for reception of an ampules or medication container (12) retaining a medicinal fluid, said ampule including a fluid expelling piston (17) movable in proximal direction within the ampule and having means for reception of an injection needle (16) engageable with the proximal end of the ampule and movable with the ampule in proximal direction with respect to the housing in an injecting direction; -
an injection plunger or tappet (18) engageable against said piston (17); a plunger length setting mechanism (62) coupled to said plunger and forming with said plunger an injection dosing arrangement (18-22), said plunger setting mechanism having two relatively rotatable parts, one of which is formed by said plunger (18), and means (40, 70, 71,
100) for selectively preventing relative rotation of one of said parts with respect to said housing;a spring (105) coupled to the injection dosing arrangement (18-62); user operable spring cocking means (74); user operable spring release means (11,
53),said spring (105), after cocking, moving the injection dosing arrangement (18-62) upon release by the spring release means (11-53) longitudinally in the housing for engagement of said plunger (18) with said piston (17) to expel medicament fluid from the injection needle, wherein said spring cocking means (74) is rotatable with respect to the housing and forms a first setting element; said device further having a second setting element (86); a control arrangement (85) depending on the position of the first setting element (74) relative to the second setting element (86), said control arrangement including an engagement element (85); and a counterpart engagement element having a first and second portions (110,
113) coupled to said plunger length setting mechanism (62), said engagement element being engageable with the first portion (110) after cocking by said spring cocking means (74) and with the second portion (113) after the injection portion process. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification