Medicament delivery device with easily connected disposable and reusable units

Patent metadata

Field	Value
Publication number	US-12201813-B2
Application number	US-201916968350-A
Country	US
Kind code	B2
Filing date	Feb 1, 2019
Priority date	Feb 19, 2018
Publication date	Jan 21, 2025
Grant date	Jan 21, 2025

Abstract

An automatic medicament delivery device for auto injections that has a re-usable part containing a driving and a signal mechanism and a disposable part containing a syringe or a cartridge with a medicament. The parts can be interconnected simply in one axial move avoiding any rotation or turning. The device is easily and safely connected from two parts prior and during the injection process and automatically dissembled when the injection is completed allowing to remove the disposable part.

First claim

The invention claimed is:

1. A medicament delivery device having an axis A, the device comprising:
a first unit having a distal closed end and an open connecting proximate end, the open connecting proximate end comprising a driving unit with a driving element that moves in a reciprocating fashion; and
a second unit with a housing adapted to receive a medicament container and having a first proximal medicament delivery end and a second distal connecting end, where the second distal connecting end is adapted to be connected with the open proximate connecting end of the first unit by insertion of the second connecting end into the open connecting proximate end along the axis A,
wherein one of the open connecting proximate end and second distal connecting end is equipped with at least one flexible part that moves radially inwards and outwards relative to the axis A due to a force created by the insertion of the second distal connecting end into the open connecting proximate end,
wherein a movable locking element is arranged coaxially within the first unit,
wherein the movable locking element is configured to interact with the at least one flexible part due to a relative axial movement of the at least one flexible part and the locking element so as to lock the open connecting proximate end and the second distal connecting end of the device relative to each other,
wherein the at least one flexible part has a wedge-shaped guiding extensions on its outer surface interacting with an inner surface of the locking element,
wherein the driving unit is configured to move the driving element to engage the movable locking element, wherein the moveable locking element is axially moved by the driving element in the distal closed end direction to release the at least one flexible part from the movable locking element, and wherein releasing the at least one flexible part from the movable locking element enables a disconnection of the first unit and the second unit, and
wherein the second distal connecting end of the housing has a longitudinal cross-section shape of varying dimensions and an extension formed at the end of an outer surface of the second distal connecting end.

2. The medicament delivery device according to claim 1 , wherein the locking element is one of a separate axially movable element and a locking element integrated with the open connecting proximate end of the first unit.

3. The medicament delivery device according to claim 1 , wherein the at least one flexible part is one of an integral part of one of a frame and the second distal connecting end and a separate flexible part arranged on one of the open connecting proximate end and second distal connecting end.

4. The medicament delivery device according to claim 3 , wherein at least one of the at least one flexible part is integrally arranged on the frame carrying the driving unit, the at least one flexible part is extending in the axial A direction towards the distal closed end and forming a receiving opening; the open connecting proximate end is integrated with the locking element surrounding the at least one flexible part and is axially movable by driving unit via the driving element relative the housing allowing a first inserting and locking state of the open connecting proximate end and second distal connecting end and a second release state of the open connecting proximate end and second distal connecting end relative to each other.

5. The medicament delivery device according to claim 4 , wherein in the first inserting and locking state of the device, the open connecting proximate end with the locking element is axially movable by the driving unit via the driving element in direction to the distal closed end allowing radially and outwardly movement of the at least one flexible part relative to the axis A releasing the wedge-shaped extensions of the flexible element from interacting with the inner surface of the locking element and insertion of the second connection end with the circular extension into the receiving opening; wherein springs situated between the movable open connecting proximate end and the frame are compressed; the driving unit is controlled to react on the second distal connecting end insertion allowing the movement of the open connecting proximate end by the springs in the opposite to the closed end axial direction so as to perform a snap-locking of the open connecting proximate end and second distal connecting end relative to each other; and in the second release state of the device, the driving unit is controlled to react by moving the open connecting proximate end in direction towards the closed end allowing the at least one flexible part flexing outwardly relative to the axis A thus releasing the open connecting proximate end and second distal connecting end of the units from connection with each other.

6. The medicament delivery device according to claim 1 , wherein the at least one flexible part is integrally arranged on the second distal connecting end which is to be inserted into a receiving opening in the open connecting proximate end; the receiving opening is provided with a longitudinal cross-section shape of a various radial dimensions on its inner surface adapted to accommodate the at least one flexible part having a corresponding longitudinal cross-section on its outer surface and allowing in a first state of the device an inserting and locking of the open connecting proximate end and second distal connecting end relative to each other and in a second state of the device a releasing of the open connecting proximate end and second distal connecting end relative to each other.

7. The medicament delivery device according to claim 6 , wherein the at least one flexible part having an outwardly extending ledge at its distal end is provided as an integral part of the housing, the housing having the second distal connecting end with an axial opening; the second distal connecting end is adapted to be inserted into the receiving opening of the open connecting proximate end having inclined wall surfaces and a groove able to accommodate the outwardly extending ledge for snap-locking the open connecting proximate end and second distal connecting end relative to each other.

8. The medicament delivery device according to claim 7 , wherein in the first inserting and locking state of the device, when the second distal connecting end is to be inserted into the opening, wherein the outwardly extending ledge is guided along the inclined surfaces forcing the at least one flexible part to move radially and inwardly pressing by its outer edge the locking element axially loaded by a spring in the open connecting proximate end direction until the outwardly extending ledge been accommodated by the groove allowing the at least one flexible part move radially and outwardly relative to the axis A so as to snap lock the housing relative the housing; simultaneously expanded outwardly the at least one flexible part stopping pressure on the element so as the spring is released and pushing the locking element axially in the housing direction entering into the opening on the second distal connecting end, so as to press outwardly on the at least one flexible part when the at least one flexible part is interacting with the surfaces of the opening in the open connecting proximate end, preventing disassembling of the open connecting proximate end and second distal connecting end; in the second releasing state of the device, when the locking element is axially moved by the driving element in the distal closed end direction, the at least one flexible part is released from being pressured to the open connecting proximate end inner surface allowing the at least one flexible part to move radially and inwardly towards the axis A an

Assignees

• Shl Medical Ag

Inventors

• Carlsson Daniel
• Säll Daniel

Classifications

• A61M2205/8206

  battery-operated · CPC title

• A61M2205/581

  by audible feedback · CPC title

• A61M2005/31588

  electrically driven · CPC title

• A61M2005/2492

  via snap connection · CPC title

• A61M2005/2403

  Ampoule inserted into the ampoule holder · CPC title