Infusion device
First Claim
1. An infusion device, comprising:
- a housing;
a compartment inside the housing for a medicament container;
an infusion needle arranged to the housing for connection to the medicament container for delivering a dose of medicament;
a piston plunger disposed in the housing for acting on the medicament container to deliver the dose of medicament, wherein the piston plunger comprises a number of distinct separate segments for interconnection to each other, thereby forming an elongated piston plunger;
a first spring configured to act on a stack of the separate segments; and
a mechanical driver configured to act on the piston plunger to deliver the dose of medicament, the mechanical driver comprising a drive nut and a drive spring configured to rotatably drive the drive nut;
wherein upon activation of the drive spring, the drive nut urges a first segment of the number of distinct separate segments a distance thereby enabling the first spring to push a second segment of the number of distinct separate segments into line behind the first segment and to connect the second segment to the first segment;
the number of distinct separate segments have threads to interact with the drive nut;
the drive spring comprises a flat spiral spring disposed in a rotatable spring housing; and
the infusion device further comprises a drive member between the spring housing and the drive nut.
2 Assignments
0 Petitions
Accused Products
Abstract
The present invention relates to an infusion device comprising a housing (10, 12); a compartment inside said housing for positioning a medicament container (78), an infusion needle (124) arranged to said housing, being connectable to said medicament container for delivering a dose of medicament, a piston plunger (72) arranged in said housing capable of acting on said medicament container for delivering a dose of medicament, mechanical drive means capable of acting on said piston plunger for delivering a dose of medicament. The invention is characterized in that said piston plunger comprises a number of distinct segments (82) being inter-connectable to each other for forming an elongated piston plunger.
5 Citations
14 Claims
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1. An infusion device, comprising:
- a housing;
a compartment inside the housing for a medicament container; an infusion needle arranged to the housing for connection to the medicament container for delivering a dose of medicament; a piston plunger disposed in the housing for acting on the medicament container to deliver the dose of medicament, wherein the piston plunger comprises a number of distinct separate segments for interconnection to each other, thereby forming an elongated piston plunger; a first spring configured to act on a stack of the separate segments; and a mechanical driver configured to act on the piston plunger to deliver the dose of medicament, the mechanical driver comprising a drive nut and a drive spring configured to rotatably drive the drive nut; wherein upon activation of the drive spring, the drive nut urges a first segment of the number of distinct separate segments a distance thereby enabling the first spring to push a second segment of the number of distinct separate segments into line behind the first segment and to connect the second segment to the first segment;
the number of distinct separate segments have threads to interact with the drive nut;
the drive spring comprises a flat spiral spring disposed in a rotatable spring housing; and
the infusion device further comprises a drive member between the spring housing and the drive nut. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
- a housing;
Specification