Administering apparatus comprising a dosing device

• US 20040186431A1
• Filed: 01/29/2004
• Published: 09/23/2004
• Est. Priority Date: 07/30/2001
• Status: Active Grant

• Current Assignee: TecPharma Licensing AG (Ypsomed Holding AG)
• Original Assignee: TecPharma Licensing AG (Ypsomed Holding AG)
• Inventors: Kirchhofer, Fritz, Graf, Roney
• Granted Patent: US 8,007,476 B2
• Time in Patent Office: Days
• US Class Current: 604/124
• CPC Class Codes: A61M 5/14566 with a replaceable reservoir for receiving a piston rod of the pump
• 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 5/315 Pistons; Piston-rods; Guiding, blocking or restricting the movement of the rod or piston; Appliances on the rod for facilitating dosing ; Dosing mechanisms
• CPC Class Codes: A61M 5/31501 Means for blocking or restricting the movement of the rod or piston A61M5/5013 takes precedence
• 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 5/31553 without axial movement of dose setting member
• CPC Class Codes: A61M 5/3158 performed by axially moving actuator operated by user, e.g. an injection button

Abstract

An administering apparatus having a casing including a reservoir for a product to be administered, a piston which can be shifted in the reservoir in an advancing direction towards a reservoir outlet to administer the product, a piston rod, a dosing and drive element for performing a dosing movement for selecting a product dose and a delivery movement for delivering the product dose, and a dose setting member which is moved in the advancing direction during the delivery movement, and which engages the piston rod and the casing such that it can only be moved in the advancing direction jointly with the piston rod and is moved counter to the advancing direction relative to the piston rod during the dosing movement.

Claims

1. An administering apparatus comprising a dosing device, said administering apparatus comprising:

a) a casing comprising a reservoir for a product which can be delivered;

b) a piston which can be shifted in the reservoir in an advancing direction towards a reservoir outlet to deliver the product;

c) a piston rod;

d) a dosing and drive element using which a dosing movement for selecting a product dosage and a delivery movement for delivering the product dosage can be performed relative to said casing, and which is in an engagement with said piston rod which slaves the piston rod during said dosing movement, but which allows a delivery movement of said dosing and drive element relative to the piston rod;

e) and a dosage setting member which is moved in the advancing direction by the dosing and drive element during the delivery movement, and which engages with each of the piston rod and the casing, such that it can only be moved in the advancing direction jointly with the piston rod and is moved counter to the advancing direction, relative to the piston rod, by the dosing movement.

2. The administering apparatus as set forth in claim 1, wherein said dosage setting member and the dosing and drive element are arranged one behind the other, without overlapping, with respect to the advancing direction.

3. The administering apparatus as set forth in claim 1, wherein a blocking means is provided which engages with the piston rod in order to prevent the piston rod from moving counter to the advancing direction.

4. The administering apparatus as set forth in claim 1, wherein a blocking means is provided which is in a braking engagement with the piston rod which makes it more difficult for the piston rod to move in the advancing direction.

5. The administering apparatus as set forth in claim 3, wherein the piston rod and said blocking means engage such that the piston rod slaves the blocking means during the dosing movement.

6. The administering apparatus as set forth in claim 3, wherein the blocking means is coupled to the casing such that it can be rotated about a longitudinal axis of the piston rod.

7. The administering apparatus as set forth in claim 3, wherein the piston rod comprises at least one row of teeth with which at least one engagement element of the blocking means engages.

8. The administering apparatus as set forth in claim 1, wherein the casing forms a linear guide for the dosage setting member, with which the dosage setting member engages.

9. The administering apparatus as set forth in claim 8, wherein:

the casing comprises at least a front casing section and a rear casing section which can be detachably connected to each other;

said front casing section contains the reservoir and forms said linear guide for the dosage setting member; and

said rear casing section comprises the dosing and drive element.

10. The administering apparatus as set forth in claim 1, wherein one of a cannula of at most 30 gauge or a cannula having a combination of outer and inner-diameter not specified in ISO 9626, having an outer diameter of 320 μ

m at most, forms an infusing part of the injection apparatus.

11. The administering apparatus as set forth in claim 10, wherein said cannula is one of a 31 or 32 gauge cannula.

12. A reservoir module for an administering apparatus as set forth in claim 1, said reservoir module comprising:

a) a casing section of the administering apparatus, comprising a reservoir for a product which can be delivered and a connecting means for connecting to a rear casing section of the administering apparatus;

b) a piston which is accommodated in said reservoir such that it can be shifted in an advancing direction towards a reservoir outlet, in order to deliver product;

c) a piston rod which is mounted by the front casing section, such that it can be rotated about its longitudinal axis, and comprises a thread; and

d) a dosage setting member which is in threaded engagement with the piston rod and is guided by the front casing section, such that a rotational movement of the piston rod about its longitudinal axis moves said dosage setting member counter to the advancing direction;

e) wherein the piston rod comprises a connecting section for coupling to a dosing and drive element of the administering apparatus, and wherein said connecting section is formed such that the coupling between the piston rod and the dosing and drive element of the administering apparatus allows the dosing and drive element and the piston rod to shift relative to each other along the longitudinal axis of the piston rod and prevents the dosing and drive element and the piston rod from rotating relative to each other about the longitudinal axis of the piston rod.

13. The reservoir module as set forth in claim 12, wherein the front casing section comprises a sleeve-shaped reservoir part comprising the reservoir and a sleeve-shaped mechanism holder, which are either detachably or non-detachably connected to each other, wherein said mechanism holder holds the piston rod and guides the dosage setting member.

14. The reservoir module as set forth in claim 12, wherein said reservoir module is a disposable module provided to be exchanged in its entirety after the reservoir has been emptied.

15. The reservoir module as set forth in claim 12 which is provided as an exchange module for a reservoir module forming a part of an administering apparatus.

16. The reservoir module as set forth in claim 15, wherein said administering apparatus comprises:

a) a casing;

b) a piston which can be shifted in an advancing direction;

c) a piston rod;

d) a dosing and drive element using which a dosing movement for selecting a product dosage and a delivery movement for delivering the product dosage can be performed relative to said casing, and which is in an engagement with said piston rod which slaves the piston rod during said dosing movement, but which allows a delivery movement of said dosing and drive element relative to the piston rod;

e) and a dosage setting member which is moved in the advancing direction by the dosing and drive element during the delivery movement, and which engages with each of the piston rod and the casing, such that it can only be moved in the advancing direction jointly with the piston rod and is moved counter to the advancing direction, relative to the piston rod, by the dosing movement

17. An administering apparatus comprising:

a casing comprising a reservoir for containing a product to be administered;

a piston which can be shifted in the reservoir in an advancing direction towards a reservoir outlet to administer the product;

a piston rod;

a dosing and drive element for selecting a product dose and for delivering the product dose, said dosing and drive element in an engagement with said piston rod which slaves the piston rod during said selecting and which allows a delivery movement of said dosing and drive element relative to the piston rod; and

a dose setting member movable in the advancing direction by the dosing and drive element during said delivering, said dose setting member engaging the piston rod and the casing such that it moves in the advancing direction jointly with the piston rod and moves counter to the advancing direction and relative to the piston rod by said selecting.

18. The administering apparatus according to claim 17, wherein the dosing and drive element is connected, secured against rotating, to the piston rod, and the dose setting member engages with the casing to move the dose setting member counter to the advancing direction.

19. The administering apparatus according to claim 18, wherein the dosing and drive element pushes against the dose setting member during the delivery movement.

20. The administering apparatus according to claim 19, wherein the dosing and drive element and the dose setting member are arranged one behind the other, without overlap, with respect to the advancing direction.