Pen-type injector

Patent metadata

Field	Value
Publication number	US-8992486-B2
Application number	US-201313909681-A
Country	US
Kind code	B2
Filing date	Jun 4, 2013
Priority date	Mar 3, 2003
Publication date	Mar 31, 2015
Grant date	Mar 31, 2015

Abstract

A housing for a dispensing apparatus. The housing comprising a main housing and a dose dial sleeve. The dose dial sleeve comprising a helical groove configured to engage a threading provided by the housing. A dose knob is disposed near a proximal end of the dose dial sleeve and a piston rod is provided within the housing. The piston rod is non-rotatable during a dose setting step. A driver comprises an internal threading near a distal portion of the driver and is adapted to engage an external thread of the piston rod. A tubular clutch is located adjacent a distal end of the dose knob and operatively coupled to the dose knob. The dose dial sleeve may extend circumferentially around at least a portion of the tubular clutch.

First claim

The invention claimed is:

1. A housing part for a medication dispensing apparatus, said housing part comprising:
a main housing, said main housing extending from a distal end to a proximal end;
a dose dial sleeve positioned within said housing, said dose dial sleeve comprising a helical groove configured to engage a threading provided by said main housing;
a dose knob disposed near a proximal end of said dose dial sleeve;
a piston rod provided within said housing, said piston rod is non-rotatable during a dose setting step relative to said main housing;
a driver extending along a portion of said piston rod, said driver comprising an internal threading near a distal portion of said driver, said internal threading adapted to engage an external thread of said piston rod; and,
a tubular clutch located adjacent a distal end of said dose knob, said tubular clutch operatively coupled to said dose knob,

wherein said dose dial sleeve extends circumferentially around at least a portion of said tubular clutch.

2. The housing part of claim 1 , wherein said tubular clutch is directly coupled to said dose knob.

3. The housing part of claim 1 , wherein said main housing comprises a window through which at least a portion of an outer surface of said dose dial sleeve may be viewable.

4. The housing part of claim 3 , wherein said window is located near a proximal end of said main housing and near a helical rib provided on an inner surface of said outer housing.

5. The housing part of claim 1 , wherein said driver comprises a cylindrical shape.

6. The housing part of claim 1 , wherein said dose knob extends circumferentially around at least a portion of said tubular clutch.

7. The housing part of claim 1 , wherein during a dose dispensing step, said dose knob is activated in a distal direction and said tubular clutch disengages such that said dose dial sleeve rotates back towards said proximal end of said main housing.

8. The housing part of claim 7 , wherein during said dose dispensing step, said dose dial sleeve and said tubular clutch rotate together.

9. The housing part of claim 1 , further comprising
a container housing operatively coupled to said main housing, said container housing comprising a fluid container,
wherein said fluid container defines a medicament filled reservoir with a movable plunger at a proximal end and an outlet at a distal end,
said plunger movable by said piston rod to be advanced toward an outlet of said fluid container when said piston rod is moved distally, wherein
during a dose dispensing step, said driver advances axially in a distal direction relative to said main housing, and
said driver advances said piston rod in said distal direction so as to dispense said medicament from said outlet at said distal end of said fluid container.

10. The housing part of claim 1 , wherein said dose setting knob is coupled in part by said clutch to said dose dial sleeve so as to prevent relative movement between said dose setting knob and said dose dial sleeve during a dose setting step.

11. The housing part of claim 1 , wherein said dose setting knob is partially secured to said dose dial sleeve so as to allow relative movement between said dose setting knob and said dose dial sleeve during a dose dispensing step.

12. The housing part of claim 1 , wherein said driver comprises at least one flange.

13. The housing part of claim 12 , wherein said at least one flange is located near a distal portion of said driver.

14. The housing part of claim 1 , further comprising a clicker, said clicker providing at least an audible feedback to a user when said dose knob is rotated.

15. The housing part of claim 14 , wherein said clicker provides tactile feedback to a user when said dose knob is rotated.

16. The housing part of claim 14 , wherein said clicker provides audible feedback when said dose knob is rotated in a dose increasing direction.

17. The housing part of claim 14 , wherein said clicker provides audible feedback when said dose knob is rotated in a dose decreasing direction.

18. The housing part of claim 14 , wherein said clicker comprises,
at least one flexible arm, said flexible arm comprising at least one tooth member, and
at least one spline,
wherein when said dose knob is rotated, said at least one flexible arm deforms and drags said tooth member over said at least one spline so as to provide said audible feedback.

19. The housing part of claim 14 , wherein said clicker is disposed between said clutch and a proximal end of said piston rod.

20. The housing part of claim 14 , wherein
said clicker generally comprises a cylindrical shape having a first and a second end, and
said cylindrical shape is provided at said first end with at least one flexible extending arm.

21. The housing part of claim 1 , wherein
said tubular clutch comprises a plurality of teeth formed near an end of said tubular clutch,
said plurality of teeth remaining meshed during a dose setting step, and
said plurality of teeth becoming unmeshed during a dose dispensing step.

22. The housing part of claim 21 , wherein said plurality of teeth comprise a plurality of dog teeth.

23. The housing part of claim 1 , wherein said piston rod comprises a generally circular cross section.

24. The housing part of claim 1 wherein said external thread of said piston rod comprises a part thread.

25. The housing part of claim 1 ,
wherein said piston rod comprises a first thread and a second thread, and
wherein at least one of said first or said second thread comprises at least one part threads rather than a complete thread.

26. The housing part of claim 1 , wherein said dose dial sleeve is provided outside said tubular clutch and radially inward of said main housing.

27. The housing part of claim 1 , wherein said main housing further comprises a helical rib, said helical rib adapted to be seated in said helical groove provided along an outer surface of said dose dial sleeve.

28. The housing part of claim 27 , wherein said helical rib extends for at least a single sweep of said inner surface of said main housing.

29. The housing part of claim 27 , wherein said helical rib comprises a single start helical rib.

30. The housing part of claim 1 , wherein said dose dial sleeve comprises at least one radial stop, said radial stop positioned near an end of said helical groove.

31. The housing part of claim 30 , wherein when said dose dial sleeve is rotated to set a maximum dose of said medication dispensing apparatus, said radial stop near said end of said helical groove abuts an end of said threading provided on said inner surface of said main housing and thereby prevents rotation of said dose dial sleeve.

32. The housing part of claim 30 , wherein said radial stop is positioned near a distal end of said helical groove.

33. The housing part of claim 1 , wherein if a user inadvertently dials said dose knob in one direction beyond a desired dose, said dose knob may be rotated in a second direction so as to allow said dialed dose to be reduced.

34. The housing part of claim 1 , wherein, to dispense a set dose, said dose knob is activated, and wherein activation of said dose knob disengages said tubular clutch in an axially direction with respect to said dose dial s

Assignees

• Veasey Robert Frederick
• Perkins Robert
• Plumptre David Aubrey
• Sanofi Aventis Deutschland

Inventors

• Veasey Robert Frederick
• Perkins Robert
• Plumptre David Aubrey

Classifications

• A61M5/31535

  Means improving security or handling thereof, e.g. blocking means, means preventing insufficient dosing, means allowing correction of overset dose · CPC title

• A61M2005/3126

  Specific display means related to dosing · CPC title

• A61M5/31551

  including axial movement of dose setting member · CPC title

• A61M5/31541

  Means preventing setting of a dose beyond the amount remaining in the cartridge · CPC title

• A61M5/24 Primary

  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