Device for administering an injectable product

• US 20020016571A1
• Filed: 07/11/2001
• Published: 02/07/2002
• Est. Priority Date: 01/12/1999
• Status: Active Grant

• Current Assignee: Fritz Kirchhofer, Thomas Gurtner
• Original Assignee: TecPharma Licensing AG (Ypsomed Holding AG)
• Inventors: Kirchhofer, Fritz, Gurtner, Thomas
• Granted Patent: US 6,699,224 B2
• Time in Patent Office: Days
• US Class Current: 604/218
• CPC Class Codes: A61M 5/24 Ampoule syringes, i.e. syringes with needle for use in combination with replaceable ampoules or carpules, e.g. automatic ampoules or carpules A61J1/06
• CPC Class Codes: A61M 5/31553 without axial movement of dose setting member
• CPC Class Codes: A61M 5/31561 using freely adjustable volume steps
• CPC Class Codes: A61M 5/31563 interacting with a displaceable stop member
• CPC Class Codes: A61M 5/3158 performed by axially moving actuator operated by user, e.g. an injection button
• CPC Class Codes: A61M 5/31593 Multi-dose, i.e. individually set dose repeatedly administered from the same medicament reservoir

Abstract

The invention refers to a device for administering an injectable product in doses, comprising a casing, itself comprising: a reservoir for the product; a piston which forces product out of the reservoir when moved in a feed direction towards a reservoir outlet; a drive member (6); a driven member which is slaved by the drive member (6) when the drive member (6) is moved in the feed direction, so moving the piston in the feed direction; and a dosing member (15) which may be rotated about the sliding axis (V) of the drive member (6), to set the product dosage to be administered. The drive member (6) and the dosing member (15) abut each other via at least one dosage stopper (14, 18) each, one of which is provided on the drive member (6) and the other on the dosing member (15). At least one of these dosage stoppers (14, 18) at least partially encircles the sliding axis (V) of the drive member (6) in the form of a spiral. The at least one spiral dosage stopper (18) exhibits a continuous course with a constant pitch α.

Claims

1. A device for administering an injectable product in doses, comprising:

a) a casing, comprising a reservoir for said product;

b) a piston, forcing product out of said reservoir when moved in a feed direction towards a reservoir outlet;

c) a drive member, which may be moved along a sliding axis in said feed direction up to a proximal end position, and counter to said feed direction up to a distal end position;

d) a driven member, which is prevented from moving counter to said feed direction, and is slaved by said drive member when said drive member is moved in said feed direction, so moving said piston in said feed direction;

e) a dosing member, which may be rotated about said sliding axis of said drive member, to set the product dosage to be administered;

f) wherein in said distal end position, said drive member and said dosing member abut via at least one dosage stopper each, one of which is provided on said drive member and the other on said dosing member; and

wherein

g) at least one of said dosage stoppers at least partially encircles said sliding axis of said drive member in the form of a spiral;

characterized in that

h) said at least one spiral dosage stopper exhibits a continuous course with a constant pitch.

2. The device as set forth in claim 1, characterized in that said dosing member can be twisted between determined or determinable rotational angular positions, preferably by being locked into rotational angular locking positions, and in that said other dosage stopper, preferably provided on said drive member, extends to said spiral dosage stopper, preferably provided on said dosing member, covering an angle larger than an angular spacing between immediately consecutive rotational angular positions of said dosing member.

3. The device as set forth in the preceding claim, characterized in that said other dosage stopper extends over an angle which is at least twice said angular spacing between immediately consecutive rotational angular positions of said dosing member.

4. The device as set forth in claim 2, characterized in that said second dosage stopper extends over an angle at most ten times said angular spacing between immediately consecutive rotational angular positions of said dosing member.

5. The device as set forth in claim 1, characterized in that said other dosage stopper, preferably provided on said drive member, is of the same pitch as said spiral dosage stopper, with respect to said spiral dosage stopper preferably provided on said dosing member.

6. The device as set forth in the preceding claim, characterized in that said spiral dosage stopper is provided on a proximal front face of said dosing member and in that said other dosage counter stopper is provided by means of a cam projecting out of said drive member perpendicular to said feed direction.