# US 9,517,310 B2 · Pen injector with resetting mechanism for receiving new cartridge during driver decoupling and proximal spindle retraction > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,517,310 B2 - Document ID: US9517310B2 - Status: Granted - Kind: B2 - Application number: 13/454,776 - Filed: 2012-04-24 - Published: 2012-08-16 - Granted: 2016-12-13 - Earliest claimed: 2009-06-01 - Assignees: Sanofi-Aventis Deutschland GmbH - Applicants: David Plumptre; Christopher Jones - Inventors: David Plumptre; Christopher Jones - Web page: https://patentgrep.com/patent/US9517310B2 ## CPC - A61M 5/31543: {piston rod reset means, i.e. means for causing or facilitating retraction of piston rod to its starting position during cartridge change} - A61M 5/31551: {including axial movement of dose setting member} - A61M 5/31585: {the component being manually operated or triggered by an axially moving actuator operated by user, e.g. an axially movable injection button} - A61M 5/31511: {Piston or piston-rod constructions, e.g. connection of piston with piston-rod (A61M5/5066 takes precedence)} - A61M 5/31541: {Means preventing setting of a dose beyond the amount remaining in the cartridge} - A61M 5/31558: {using scaling up or down transmissions, e.g. gearbox} - A61M 5/31575: {using scaling up or down transmissions, e.g. gearbox} - A61M 2005/2407: {from the rear} - A61M 2005/2488: {via rotation, e.g. threads or bayonet} - A61M 2005/2492: {via snap connection} - A61M 2005/3152: {including gearings to multiply or attenuate the piston displacing force} - A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)} ## Abstract A resettable dose setting mechanism for a drug delivery device comprising a driver for driving a spindle of the drug delivery device is provided. Said driver comprises a first component and a second component rotationally coupled to said first component. During resetting of said drug delivery device, said first component is rotationally decoupled from said second component. ## Claims ### Claim 1 A resettable dose setting mechanism for a drug delivery device comprising a driver for driving a spindle of the drug delivery device device in a distal direction to cause a distal end of the spindle to act on a bung within a cartridge, said driver comprising a first component and a second component rotationally coupled to said first component, wherein during resetting of said drug delivery device, that is during preparation of the dose setting mechanism for receiving a new cartridge, said first component is decoupled from said second component such that the first component can rotate relative to the second component, wherein during a dose setting operation the first and second components are coupled together to rotate together in unison relative to an outer housing and the spindle when a user dials a dose of medicament for administration causing the driver to move axially in a proximal direction, the dose setting mechanism further comprising a dose limiter wherein during resetting of said drug delivery device to add the new cartridge, said dose limiter is reset to an initial position and the spindle retracts axially in the proximal direction. ### Claim 2 (depends on 1) The resettable dose setting mechanism of claim 1 wherein the dose limiter has an internal helical groove matching a helical groove of the driver. ### Claim 3 (depends on 2) The resettable dose setting mechanism of claim 2 further comprising a housing wherein the dose limiter is located between the driver and the housing, disposed between a first flange of the driver and a second flange of the driver. ### Claim 4 (depends on 3) The resettable dose setting mechanism of claim 3 wherein an outer surface of the dose limiter and an inner surface of the housing are keyed together by way of splines. ### Claim 5 (depends on 1) The resettable dose setting mechanism of claim 1 wherein first component comprises a first component part and a second component part. ### Claim 6 (depends on 1) The resettable dose setting mechanism of claim 1 wherein first component is an integral component part. ### Claim 7 (depends on 1) The resettable dose setting mechanism of claim 1 wherein during resetting of said drug delivery device, said first component is decoupled from said second component by moving said first component in an axial direction. ### Claim 8 (depends on 1) The resettable dose setting mechanism of claim 1 wherein when said drug delivery device is used to set the dose of medication, both said first component and said second component rotate together at a same rate. ### Claim 9 (depends on 1) The resettable dose setting mechanism of claim 1 wherein when said device is used to inject a set dose of medication, both said first component and said second component rotate and/or move in an axial direction. ### Claim 10 (depends on 1) The resettable dose setting mechanism of claim 1 comprising a housing, a rotating sleeve in rotatable engagement with respect to said housing, the driver and the spindle operatively coupled to said driver, such that when a user sets the dose by rotating said rotating sleeve, both said first component and said second component of said driver rotate together, and such that when said user resets said resettable dose setting mechanism, said first component of said driver is decoupled from said second component of said driver and said first component can rotate back to an original position. ### Claim 11 (depends on 10) The resettable dose setting mechanism of claim 10 and further comprising a spindle guide engaged with said spindle, wherein during resetting of said drug delivery device, said spindle rotates while said spindle guide does not rotate. ### Claim 12 (depends on 10) The resettable dose setting mechanism of claim 10 further comprising a cartridge holder releasably coupled to said resettable dose setting mechanism, wherein decoupling of said first component from said second component is effected by decoupling said cartridge holder from said resettable dose setting mechanism. ### Claim 13 (depends on 10) The resettable dose setting mechanism of claim 10 wherein decoupling of said first component from said second component is effected by an axial movement of said spindle. ### Claim 14 (depends on 10) The resettable dose setting mechanism of claim 10 further comprising a biasing means wherein decoupling of said first component from said second component is effected by said biasing means. ### Claim 15 (depends on 10) The resettable dose setting mechanism of claim 10 wherein said housing comprises the outer housing and/or an inner housing.