Spring force assembly for biasing or actuating stoppers of syringes, injection pen cartridges and the like

Patent metadata

Field	Value
Publication number	US-11027059-B2
Application number	US-201414466256-A
Country	US
Kind code	B2
Filing date	Aug 22, 2014
Priority date	Feb 27, 2012
Publication date	Jun 8, 2021
Grant date	Jun 8, 2021

Abstract

A spring force assembly for biasing a displaceable stopper of a liquid medicament cartridge including a spring element arranged along a longitudinal axis, with brace elements and coupling elements, with the coupling elements restricting the distance between the brace elements which also restricts the possible expansion of the spring element.

First claim

The invention claimed is:

1. An infusion pump device, comprising a spring force unit for biasing a displaceable stopper of a liquid medicine cartridge, wherein the spring force unit is a spring force assembly comprising a spring element arranged along a longitudinal axis, comprising:
a first brace element is arranged on and supports one longitudinal end of the spring element;
a second brace element is arranged on the other longitudinal end of the spring element;
a first coupling element attached to the first brace element and aligned to the longitudinal axis; and
a second coupling element attached permanently to the second brace element and aligned to the longitudinal axis; and

wherein the first coupling element and the second coupling element are each single-piece elements operationally coupled to each other in such a way that they restrict the distance between the first brace element and the second brace element to a certain maximum value, thereby also restricting the possible expansion of the spring element.

2. The infusion pump device according to any of claim 1 , further comprising:
a compressing mechanism for compressing the spring force unit, with a cartridge holding block in which the liquid medicine cartridge can be mounted;
an open cavity in which the spring force unit is mounted with one distal end of the spring force unit abutting the bottom of the cavity, and into which the cartridge holding block can be inserted in a linear motion; and
a mechanism for converting a linear displacement of the cartridge holding block along a longitudinal axis of the cavity into a linear displacement of the proximal end of the spring force unit toward the bottom of the cavity.

3. The infusion pump device of claim 1 , wherein the first coupling element and the second coupling element are operationally coupled to each other in such a way that they restrict the distance between the first brace element and the second brace element to a certain minimum value, thereby restricting the possible compression of the spring element.

4. The infusion pump device of claim 1 , wherein the coupling elements are operationally coupled in such a way that they form a telescopic arrangement.

5. The infusion pump device of claim 1 , wherein the spring element comprises one or more helical compression springs.

6. The infusion pump device of claim 1 , wherein the spring force unit has a damper configured to allow only a certain maximum displacement velocity during expansion of the spring element along the longitudinal axis.

7. The infusion pump device of claim 1 , wherein the first coupling element has at least one venting bore.

8. The infusion pump device of claim 1 , wherein the first coupling element has at least one venting bore for pressure relief, and wherein the first coupling element, second coupling element and the at least one venting bore interact together as a damper configured to allow only a certain maximum displacement velocity during expansion of the spring element along the longitudinal axis.

9. The infusion pump device of claim 1 , wherein:
the coupling elements are operationally coupled in such a way that they form a telescopic arrangement,
the first coupling element is provided with at least one venting bore for pressure relief, and
the first coupling element, second coupling element and the at least one venting bore interact together as a damper configured to allow only a certain maximum displacement velocity during expansion of the spring element along the longitudinal axis.

Assignees

• Roche Diagnostics Int Ag
• Roche Diabetes Care Inc

Inventors

• Niklaus Hanspeter
• Schaad Florian
• Teutsch David

Classifications

• A61M5/31565

  Administration mechanisms, i.e. constructional features, modes of administering a dose (dosing mechanisms for setting a dose A61M5/31533) · CPC title

• A61M5/3159

  Dose expelling manners · CPC title

• A61M5/31576

  Constructional features or modes of drive mechanisms for piston rods · CPC title

• A61M5/2033

  Spring-loaded one-shot injectors with or without automatic needle insertion (multishot dosing syringes A61M5/31525, needle insertion only A61M5/3287) · CPC title

• A61M5/24

  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 title