Pen-type injector

• US 20040267208A1
• Filed: 03/02/2004
• Published: 12/30/2004
• Est. Priority Date: 03/03/2003
• Status: Abandoned Application

• Current Assignee: Dca Design International Ltd.
• Original Assignee: Dca Design International Ltd.
• Inventors: Perkins, Robert, Veasey, Robert Frederick, Plumptre, David Aubrey
• Application Number:
  US10/790,225
• Publication Number:
  US 20040267208A1
• Time in Patent Office: Days
• US Class Current: 604/208
• CPC Class Codes: A61M 2005/2407 from the rear
• CPC Class Codes: A61M 2005/3126 Specific display means related to dosing
• CPC Class Codes: A61M 2205/581 by audible feedback
• CPC Class Codes: A61M 2205/582 by tactile feedback
• 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 5/31528 by means of rotational movements, e.g. screw-thread mechanisms
• CPC Class Codes: A61M 5/31533 Dosing mechanisms, i.e. setting a dose administrating mechanisms A61M5/31565
• CPC Class Codes: A61M 5/31535 Means improving security or handling thereof, e.g. blocking means, means preventing insufficient dosing, means allowing correction of overset dose
• CPC Class Codes: A61M 5/31536 Blocking means to immobilize a selected dose, e.g. to administer equal doses
• CPC Class Codes: A61M 5/31541 Means preventing setting of a dose beyond the amount remaining in the cartridge
• CPC Class Codes: A61M 5/31546 Electrically operated dose setting, e.g. input via touch screen or plus/minus buttons
• CPC Class Codes: A61M 5/31551 including axial movement of dose setting member
• CPC Class Codes: A61M 5/3156 using volume steps only adjustable in discrete intervals, i.e. individually distinct intervals
• CPC Class Codes: A61M 5/31563 interacting with a displaceable stop member
• CPC Class Codes: A61M 5/31565 Administration mechanisms, i.e. constructional features, modes of administering a dose dosing mechanisms for setting a dose A61M5/31533
• CPC Class Codes: A61M 5/31568 Means keeping track of the total dose administered, e.g. since the cartridge was inserted
• CPC Class Codes: A61M 5/3157 Means providing feedback signals when administration is completed A61M5/20 takes precedence
• CPC Class Codes: A61M 5/31575 using scaling up or down transmissions, e.g. gearbox
• CPC Class Codes: A61M 5/31578 based on axial translation, i.e. components directly operatively associated and axially moved with plunger rod
• CPC Class Codes: A61M 5/31585 performed by axially moving actuator, 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
• CPC Class Codes: A61M 5/32 : Needles; Details of needles pertaining to their connection with syringe or hub infusion needles A61M5/158; Accessories for bringing the needle into, or holding the needle on, the body A61M5/42, A61M5/46 take precedence; guide needles for catheters A61M25/065; Devices for protection of needles apparatus specially adapted for cleaning or sterilising needles A61M5/001

Abstract

The present invention relates to injectors, such as pen-type injectors, that provide for administration of medicinal products from a multidose cartridge and permit a user to set the delivery dose. The injector may include a housing, a piston rod adapted to operate through the housing, a dose dial sleeve located between the housing and the piston rod, and a drive sleeve located between the dose dial sleeve and the piston rod. The dose dial sleeve may have a helical thread of first lead and the drive sleeve may have a helical groove of second lead. The first lead of the helical thread and the second lead of the helical groove may be the same.

Claims

1. A pen-type injectors comprising:

a housing;

a piston rod adapted to operate through the housing;

a dose dial sleeve located between the housing and the piston rod, the dose dial sleeve having a helical thread of first lead; and

a drive sleeve located between the dose dial sleeve and the piston rod, the drive sleeve having a helical groove of second lead;

characterised in that the first lead of the helical thread and the second lead of the helical groove are the same.

2. A pen-type injector according to claim 1, characterised in that the piston rod has a first threaded portion at a first end and a second threaded portion at a second end;

and further including an insert or radially inwardly extending flange is located in the housing and through which the first threaded portion of the piston rod may rotate;

the dose dial sleeve being rotatable with respect to the housing and the insert;

the drive sleeve being releasably connected to the dose dial sleeve and connected to the piston rod for rotation with respect thereto along the second threaded portion of the piston rod;

and wherein a button is located on the dose dial sleeve and rotatable with respect to the dose dial sleeve; and

clutch means are provided which upon depression of the button permit rotation between the dose dial sleeve and the drive sleeve.

3. An pen-type injector according to claim 1 or claim 2, in which the injector further comprises a nut which is rotatable with respect to the drive sleeve and axially displaceable but not rotatable with respect to the housing.

4. A pen-type injector according to claim 3, in which the drive sleeve is provided at a first end with first and second flanges with an intermediate thread between the first and second flanges, the nut being disposed between the first and second flanges and keyed to the housing by spline means.

5. A pen-type injector according to claim 4, in which a first radial stop is provided on a second face of the nut and a second radial stop is provided on a first face of the second flange.

6. A pen-type injector according to claim 2 wherein the first thread of the piston rod is oppositely disposed to the second thread of the piston rod.

7. A pen-type injector according to claim 2, wherein a second end of the clutch means is provided with a plurality of dog teeth adapted to engage with a second end of the dose dial sleeve.

8. A pen-type injector according to claim 2, wherein the pen-type injector further includes clicker means disposed between the clutch means and spline means provided on the housing.

9. A pen-type injector according to claim 8, wherein the clicker means comprises a sleeve provided at a first end with a helically extending arm, a free end of the arm having a toothed member, and said sleeve being provided at a second end with a plurality of circumferentially directed saw teeth adapted to engage a corresponding plurality of circumferentially directed saw teeth provided on the clutch means.

10. A pen-type injector according to claim 8, wherein the clicker means comprises a sleeve provided at a first end with at least one helically extending arm and at least one spring member, a free end of the at least one arm having a toothed member, and said sleeve being provided at a second end with a plurality of circumferentially directed saw teeth adapted to engage a corresponding plurality of circumferentially directed saw teeth provided on the clutch means.

11. A pen-type injector according to claim 1, wherein the main housing is provided with a plurality of maximum dose stops adapted to be abutted by a radial stop provided on the dose dial sleeve.

12. A pen-type injector according to claim 11, in which at least one of the maximum dose stops comprises a radial stop located between a helical rib and spline means provided at a second end of the housing.

13. A pen-type injector according to claim 11, in which at least one of the maximum dose stops comprises a part of a raised window portion provided at a second end of the housing.

14. A pen-type injector according to claim 1, wherein the dose dial sleeve is provided with a plurality of radially extending members adapted to abut a corresponding plurality of radial stops provided at a second end of the housing.