Pre-filled retractable needle injection device
AssigneeMDC Investment Holdings, Inc.
InventorsMichael J. Botich, Thor R. Halseth, John Barker
Life of this patent
Estimating the term…
Abstract
A needle-bearing device for injecting medicinal fluid from a pre-filled cartridge is provided. After use, the needle is retracted into the body of the device to prevent inadvertent contact with the sharpened end of the needle. In one embodiment, the invention provides a manually actuable button that effectuates retraction of the needle after use. In another embodiment, retraction is effectuated automatically after the injection is complete.
Claims21
An injection device for use with a pre-filled medication cartridge of the type containing a supply of medication and having a puncturable piston positioned at a forward end therein, the device comprising:
- a barrel sized to receive the cartridge and having a forward portion including a bore of a reduced diameter;
- a first needle positioned axially within the reduced diameter portion and extending out of the forward portion of the barrel;
- a spring positioned in the barrel for exerting a rearward bias on the needle;
- a needle retainer positioned in the barrel for retaining the needle within the bore against the rearward bias exerted by the spring;
- a second needle in fluid communication with the medication in the cartridge;
- a conduit extending between the first needle and the second needle;
- an actuator operable to release the needle from the needle retainer;
- wherein the spring propels the conduit and the first needle rearwardly upon release of the needle from the needle retainer so that the conduit telescopingly engages the second needle.
A medical device for injecting medication from a cartridge containing medication, wherein the cartridge includes a forward rim, the device comprising:
- a housing having an opening for receiving the cartridge;
- a first needle projecting forwardly from the housing;
- a biasing element biasing the first needle rearwardly;
- a needle retainer releasably retaining the first needle against the bias of the biasing elements;
- an axially displaceable actuator operable to engage the needle retainer to cause the needle retainer to release the first needle upon forward axial displacement of the actuator;
- a latch operable to prevent forward axial displacement of the actuator;
- and
- a release cooperable with the rim of the cartridge to displace the latch.
A medical device for injecting medication from a cartridge containing medication, wherein the cartridge includes a forward rim, the device comprising:
- a housing for receiving the cartridge;
- a first needle projecting forwardly from the housing;
- retracting means for retracting the first needle into the housing;
- retaining means for releasably retaining the first needle from retracting into the housing;
- releasing means for releasing the first needle from the means retainer;
- safety means for preventing the releasing means from releasing the first needle;
- and
- means for overriding the safety means to allow the releasing means to release the needle from the retaining means.
Dependencies are inferred from the claim text.