# US 2019/0167890 A1 · Self-injection device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0167890 A1 - Document ID: US20190167890A1 - Status: Published application - Kind: A1 - Application number: 16/271,044 - Filed: 2019-02-08 - Published: 2019-06-06 - Earliest claimed: 2012-08-20 - Assignees: Becton, Dickinson and Company - Applicants: Becton, Dickinson and Company - Inventors: Lionel Vedrine; Ralph Sonderegger; Curt Bingham - Web page: https://patentgrep.com/patent/US20190167890A1 ## CPC - A61M 5/1452: {pressurised by means of pistons} - A61M 5/14248: {of the skin patch type} - A61M 2005/14252: {with needle insertion means} - 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 device (100) for delivering a medicament into a patient's body by injection into or through the patient's skin, including a main body having a top enclosure (116) and a bottom enclosure (104), a reservoir (160) disposed within the main body for containing the medicament, and an injection needle (152) for penetrating the skin of the patient, the needle (152) having a lumen and selectively communicating with the reservoir (160). The device also includes a pressurizing system (600, 140) for selectively pressurizing the reservoir (160). In a pre-activated position, the pressurizing system (600, 140) contacts and compresses the reservoir (160) to reduce the initial volume of the reservoir (160), thereby allowing for partial filling of the reservoir (160). ## Claims ### Claim 1 A method for a medicament delivery device having a reservoir disposed within a body and a pressurizing system for pressurizing the reservoir, the reservoir having a movable portion contacted by a plunger of the pressurizing system, the body retaining the plunger in a pre-activated position, the method, comprising: prior to filling the reservoir, varying the degree to which the plunger compresses the movable portion in the pre-activated position to reduce a fillable volume of the reservoir. ### Claim 2 (depends on 1) The method according to claim 1, wherein: the pressurizing system includes the plunger and a pressurization spring compressed by the plunger when the pressurizing system is in the pre-activated position; and the plunger comprises a foot disposed on the leg, the foot engaging a portion of the body to retain the pressurizing system in the pre-activated position. ### Claim 3 (depends on 1) The method according to claim 1, wherein: the pressurizing system includes the plunger and a pressurization spring compressed by the plunger when the pressurizing system is in the pre-activated position; and the plunger comprises a post having an engaging sprocket engaging one of a plate or a portion of the body to retain the pressurizing system in the pre-activated position. ### Claim 4 A method, comprising providing a body of a medicament delivery device; providing a reservoir in the body, the reservoir having a movable portion; and providing a plurality of plungers, each plunger having at least one axially extending member with and engaging structure thereon, the engaging portion being engagable with one of the body and a plate within the body, a length of the at least one axially extending member of a plunger differing from the length of the axially extending member of at least one of the remaining plungers, and each plunger corresponding to a reduction of fillable volume of the reservoir to one of a number of predetermined volumes. ### Claim 5 (depends on 4) The method according to claim 4, wherein the at least one axially extending member comprises a leg and the engaging portion comprises a foot engageable with the body to retain the plunger in a pre-activated position. ### Claim 6 (depends on 4) The method according to claim 4, wherein the at least one axially extending member comprises a post and the engaging portion comprises a sprocket engageable with the one of the body and the plate within the body to retain the plunger in a pre-activated position. ### Claim 7 A method, comprising: providing a body of a medicament delivery device; providing a reservoir in the body, the reservoir having a movable portion; and providing a plurality of plungers, each plunger having at least one axially extending member with an engaging means thereon, the engaging means being engagable with one of the body and a plate within the body, a length of the at least one axially extending member of a plunger differing from the length of the axially extending member of at least one of the remaining plungers, and each plunger corresponding to a reduction of fillable volume of the reservoir to one of a series of predetermined volumes. ### Claim 8 A method, comprising: providing a body of a medicament delivery device; providing a reservoir in the body, the reservoir having a movable portion; providing a pressurization system comprising a pressurization spring and a plunger, the plunger having an engaging structure for retaining the plunger against a force of the pressurization spring in an initial position contacting and compressing the reservoir; and changing the initial position of the plunger relative to the movable portion to provide to a desired fillable volume. ### Claim 9 (depends on 8) The method according to claim 8, wherein: changing the initial position of the plunger relative to the movable portion to provide to a desired fillable volume comprises changing a length of a leg of the plunger; and the engaging structure is disposed on the leg. ### Claim 10 (depends on 8) The method according to claim 8, wherein: changing the initial position of the plunger relative to the movable portion to provide to a desired fillable volume comprises changing a length of a post of the plunger; and the engaging structure is disposed on the post. ### Claim 11 A method, comprising: providing a body of a medicament delivery device; providing a reservoir in the body, the reservoir having a movable portion; providing a pressurization system comprising a pressurization spring and a plunger, the plunger having an engaging structure for retaining the plunger against a force of the pressurization spring in an initial position contacting and compressing the reservoir; and changing the amount of compression of the spring to correspond to a desired fillable volume. ### Claim 12 (depends on 11) The method according to claim 11, wherein: hanging the amount of compression of the spring to correspond to a desired fillable volume comprises changing a length of a leg of the plunger; and the engaging structure is disposed on the leg. ### Claim 13 (depends on 11) The method according to claim 11, wherein: changing the amount of compression of the spring to correspond to a desired fillable volume comprises changing a length of a post of the plunger; and the engaging structure is disposed on the post.