Medical delivery device

Patent metadata

Field	Value
Publication number	US-10912890-B2
Application number	US-201616062014-A
Country	US
Kind code	B2
Filing date	Dec 13, 2016
Priority date	Dec 14, 2015
Publication date	Feb 9, 2021
Grant date	Feb 9, 2021

Abstract

A medical delivery device is disclosed having a rod element with a stem and a first thread arrangement, a dial shell with a second thread arrangement, a delivery orifice, and a switching mechanism. In a dosing status, the rod element is movable relative to the delivery orifice by rotating the dial shell around the stem causing the first thread arrangement and the second thread arrangement to travel along each other, a dosage chamber is formed between the rod element and the delivery orifice when the rod element moves away from the delivery orifice, and the rod element is prevented from movement along a longitudinal axis when an axial force is applied. In a delivery status, the rod element is movable along the longitudinal axis relative to the delivery orifice when an axial force is applied and moving the rod element by rotating the dial shell around the stem is prevented.

First claim

The invention claimed is:

1. A medical delivery device, comprising:
a rod element having a stem with a longitudinal axis, a first thread arrangement, a proximal end and a distal end;
a dial shell having a second thread arrangement;
a delivery orifice arranged adjacent to the proximal end of the stem of the rod element; and
a switching mechanism for changing the medical delivery device from a dosing status to a delivery status, the switching mechanism including a disengaging structure,
wherein, in the dosing status of the medical delivery device,
the first thread arrangement of the rod element and the second thread arrangement of the dial shell engage, and
the rod element is movable along the longitudinal axis of its stem relative to the delivery orifice by rotating the dial shell around the stem of the rod element causing the first thread arrangement of the rod element and the second thread arrangement of the dial shell to travel along each other, wherein a dosage chamber is formed between the rod element and the delivery orifice which dosage chamber increases when the rod element moves away from the delivery orifice, and
moving the rod element along the longitudinal axis of its stem by applying an axial force to the rod element is prevented by the engagement between the first thread arrangement of the rod element and the second thread arrangement of the dial shell, and

wherein, in the delivery status of the medical delivery device,
the rod element is movable along the longitudinal axis of its stem relative to the delivery orifice by applying an axial force to the rod element, and
moving the rod element along the longitudinal axis of its stem by rotating the dial shell around the stem of the rod element is prevented by the disengaging structure of the switching mechanism which disengages the first thread arrangement of the rod element from the second thread arrangement of the dial shell upon changing the medical delivery device from the dosing status to the delivery status.

2. The medical delivery device according to claim 1 , wherein the disengaging structure of the switching mechanism comprises a projection arranged at the first thread arrangement of the rod element and a guidance groove into which the projection extends, wherein upon changing the medical delivery device from the dosing status to the delivery status the guidance groove moved and the projection travels along the guidance groove such that the first thread arrangement of the rod element disengages the second thread arrangement of the dial shell.

3. The medical delivery device according to claim 2 , wherein the projection of the disengaging structure axially extends and the guidance groove runs in a plane essentially perpendicular to the longitudinal axis of the stem of the rod element, wherein the guidance groove is shaped such that the projection is moved towards the longitudinal axis of the stem of the rod element—when the guidance groove is rotated around the longitudinal axis of the stem of the rod element.

4. The medical delivery device according to claim 1 , wherein a thread of the first thread arrangement of the rod element and/or of the second thread arrangement of the dial shell is equipped with a plurality of irregularities being positioned in a fixed distance to each other such that when rotating the dial shell around the longitudinal axis of the rod element the first thread arrangement of the rod element and the second thread arrangement of the dial shell interact with one of the plurality of irregularities at a predefined rotating angle.

5. The medical delivery device according to claim 4 , wherein the irregularities are located such that rotating the dial shell about the predefined rotating angle causes the dosage chamber to change by a predefined volume.

6. The medical delivery device according to claim 1 , wherein the rod element comprises a transfer channel which extends through the stem along the longitudinal axis of the stem.

7. The medical delivery device according to claim 6 , comprising a container seat connected to the distal end of the stem of the rod element.

8. The medical delivery device according to claim 7 , wherein the transfer channel comprises a tip and an opening wherein, in the dosing status of the medical delivery device, the tip and the opening project into the container seat such that they extend into a container when the container is arranged in the container seat.

9. The medical delivery device according to claim 8 , wherein the transfer channel of the rod element is shut upon changing the medical delivery device from the dosing status to the delivery status.

10. The medical delivery device according to claim 9 , wherein the container seat is axially moved in relation to the transfer channel upon changing the medical delivery device from the dosing status to the delivery status such that the opening of the transfer channel is sealed.

11. The medical delivery device according to claim 7 , wherein the transfer channel connects the container seat with the dosage chamber such that, when a container with a fluid is arranged in the container seat and the rod element is moved along the longitudinal axis of its relative to the delivery orifice by rotating the dial shell around the stem of the rod element in a first direction of rotation, the fluid is transferred from the container to the dosage chamber.

12. The medical delivery device according to claim 11 , wherein the dial shell and the transfer channel are arranged such that, when the container is arranged in the container seat and the rod element is moved along the longitudinal axis of its stem relative to the delivery orifice by rotating the dial shell around the stem of the rod element in a second direction of rotation opposite to the first direction of rotation, the fluid is transferred from the dosage chamber to the container.

13. The medical delivery device according to claim 1 , comprising a counter coupled to the rod element such that the counter indicates a volume of the dosage chamber formed by the rod element when being moved along the longitudinal axis of its stem relative to the delivery orifice by rotating the dial shell around the stem of the rod element.

14. The medical delivery device according to claim 13 , wherein the counter decouples from the rod element upon changing the medical delivery device from the dosing status to the delivery status.

15. The medical delivery device according to claim 1 , wherein the first thread arrangement of the rod element is a male thread arrangement with at least one male member projecting off the stem and the second thread arrangement of the dial shell comprises a thread for receiving the at least one male member.

Assignees

• Hoffmann La Roche

Inventors

• Gaillot Maxime
• Leah Roberta
• Reilly Declan
• Teucher Mark Digby
• Hayton Paul Graham
• Ridley Jonathan Paul
• Coop James Robert

Classifications

• A61M2205/583

  by visual feedback · CPC title

• A61M2205/582

  by tactile feedback · CPC title

• A61M2205/581

  by audible feedback · CPC title

• A61M2205/58

  Means for facilitating use, e.g. by people with impaired vision · CPC title

• A61M5/3213

  Caps placed axially onto the needle, e.g. equipped with finger protection guards (axially-extensible protective sleeves A61M5/3243) · CPC title