# US 10,864,325 B2 · Automatic injection device

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- Number: US 10,864,325 B2
- Document ID: US10864325B2
- Status: Granted
- Kind: B2
- Application number: 15/950,381
- Filed: 2018-04-11
- Published: 2018-08-16
- Granted: 2020-12-15
- Earliest claimed: 2013-02-27
- Assignees: Owen Mumford Limited
- Applicants: Owen Mumford Limited
- Inventors: Toby Cowe; Colin Marc Webb; Timothy Simon Evans; Oliver Anderson
- Web page: https://patentgrep.com/patent/US10864325B2

## CPC

- A61M 5/2033: {Spring-loaded one-shot injectors with or without automatic needle insertion (multishot dosing syringes A61M5/31525, needle insertion only A61M5/3287)}
- A61M 5/31571: {Means preventing accidental administration (for automatic syringes A61M5/20)}
- A61M 5/3204: {Needle cap removers, i.e. devices to dislodge protection cover from needle or needle hub, e.g. deshielding devices}
- A61M 2005/2073: {preventing premature release, e.g. by making use of a safety lock}
- A61M 2005/208: {Release is possible only when device is pushed against the skin, e.g. using a trigger which is blocked or inactive when the device is not pushed against the skin}
- A61M 2005/2496: {via pivot}
- 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

An automatic injection device for delivering a dose from a medicine containing syringe includes a housing for containing the syringe, a force applicator for applying a force to eject medicine from the syringe, a trigger coupled to the force applicator for releasing the force applicator to cause an injection, a boot covering a needle attached to the syringe to protect and maintain sterility of the needle, and a mechanical interlock. The mechanical interlock prevents actuation of the trigger prior to removal of the boot. When the boot is removed, the mechanical interlock allows for actuation of the trigger.

## Claims

### Claim 1

An automatic injection device for delivering a dose from a medicine-containing syringe, the injection device comprising:
an outer casing comprising a first opening at a proximal end and a second opening at a distal end;
a housing configured to contain the syringe, the housing being disposed within the outer casing and being axially movable within the outer casing, a proximal end of the housing being configured to pass through the first opening of the outer casing;
a firing mechanism configured to apply a force to eject medicine from the syringe;
a trigger coupled to the firing mechanism and configured to release the firing mechanism to cause an injection, the trigger being attached to the housing and configured to release the firing mechanism when the trigger is moved axially in a proximal direction relative to the housing, the trigger being configured to pass through the second opening of the outer casing;
a boot covering a needle attached to the syringe to protect and maintain sterility of the needle;
a first mechanical interlock configured to prevent actuation of the trigger prior to removal of the boot and to allow actuation or commencement of an actuation sequence following removal of the boot;
a second mechanical interlock configured to detect pressure applied to the device by a user's skin following removal of the boot, and configured to prevent actuation of the trigger in absence of pressure and to allow actuation when sufficient pressure is detected; and
a boot remover configured to remove the boot,
wherein the boot remover provides said first mechanical interlock, the boot remover being disposed at the proximal end of the outer casing, and being further disposed, prior to removal, to hold the housing in a first position,
wherein, in the first position, the housing is disposed proximally relative to the outer casing such that the proximal end of the housing projects through the first opening of the outer casing and the trigger is held within the outer casing, thereby restricting access to the trigger.

### Claim 2 (depends on 1)

The automatic injection device according to claim 1, wherein the boot remover is formed integrally with the boot.

### Claim 3 (depends on 1)

The automatic injection device according to claim 1, wherein the boot and boot remover are formed as separate discrete components, and configured such that the boot is locked into the boot remover upon insertion of the syringe into the housing.

### Claim 4 (depends on 1)

The automatic injection device according to claim 1, wherein said first mechanical interlock comprises said boot remover, the boot remover being configured such that removal of the boot remover from the housing both removes the boot from the needle and facilitates access to the trigger.

### Claim 5 (depends on 1)

The automatic injection device according to claim 1, wherein said second mechanical interlock comprises a biasing device acting between the outer casing and the housing, and configured such that when the boot remover is removed, the biasing device moves the housing in a distal direction relative to the outer casing to a second position, such that at least a part of the trigger protrudes from the distal opening of the outer casing, allowing access to the trigger.

### Claim 6 (depends on 5)

The automatic injection device according to claim 5, wherein, following removal of the boot remover and boot, when the proximal end of the outer casing is placed against the user's skin, applying force to the trigger in a proximal direction causes the proximal end of the housing to be pressed against the skin, and causes the trigger to be displaced axially relative to the housing, activating the device.