Safety injectors
First Claim
1. A single use injector device for dispensing medication from a pre-filled syringe and sealing the syringe in the device after use, the pre-filled syringe including a barrel open with a flange at one end and having a needle mounted in a hub at an opposite end, a plunger slidably mounted in the barrel having a stopper at one end engaging a predetermined dose of a drug and a flange at an opposite end, the single use injector device comprising:
- a housing, a spring located in a lumen of the housing for engaging the hub of the barrel of the syringe, a cap slidably mounted on the housing for progressively moving along a longitudinal axis of the housing while the needle of the syringe is moved from an interior of the housing to an exterior of the housing and delivery of the predetermined dose of the drug and retraction of the needle into the housing after use to prevent exposure to the used needle, and one end of said housing being sealed with an adherent foil having a pull-tab for removal of the foil and leaving an exposed adhesive surface at the one end of the housing.
3 Assignments
0 Petitions
Accused Products
Abstract
A simple mechanism that provides the manipulations required to deliver a correct injection and also incorporates the safety modifications that are needed to prevent needlestick injury and ensure self destruct capability. A surprisingly simple and cheap modification to a sterile package for the standard syringe and needle can successfully be used to automate the medical skills needed to deliver a safe injection and dispose of the hazardous needle afterwards. The sterile package consists of a housing for the syringe barrel, which can telescope into a larger diameter hollow cap covering the syringe plunger. The syringe and needle are located fully inside this two-part packaging sheath, which completely encloses and protects them.
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Citations
19 Claims
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1. A single use injector device for dispensing medication from a pre-filled syringe and sealing the syringe in the device after use, the pre-filled syringe including a barrel open with a flange at one end and having a needle mounted in a hub at an opposite end, a plunger slidably mounted in the barrel having a stopper at one end engaging a predetermined dose of a drug and a flange at an opposite end, the single use injector device comprising:
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a housing, a spring located in a lumen of the housing for engaging the hub of the barrel of the syringe, a cap slidably mounted on the housing for progressively moving along a longitudinal axis of the housing while the needle of the syringe is moved from an interior of the housing to an exterior of the housing and delivery of the predetermined dose of the drug and retraction of the needle into the housing after use to prevent exposure to the used needle, and one end of said housing being sealed with an adherent foil having a pull-tab for removal of the foil and leaving an exposed adhesive surface at the one end of the housing.
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2. A single use injector device for dispensing medication from a pre-filled syringe and sealing the syringe in the device after use, the pre-filled syringe including a barrel open with a flange at one end and having a needle mounted in a hub at an opposite end, a plunger slidably mounted in the barrel having a stopper at one end engaging a predetermined dose of a drug and a flange at an opposite end, the single use injector device comprising:
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a housing, a spring located in a lumen of the housing for engaging the hub of the barrel of the syringe, and a cap slidably mounted on the housing for progressively moving along a longitudinal axis of the housing while the needle of the syringe is moved from an interior of the housing to an exterior of the housing and delivery of the predetermined dose of the drug and retraction of the needle into the housing after use to prevent exposure to the used needle, said cap including three sets of break tabs, a first set of said three sets of break tabs engaging one end of the housing prior to movement of the syringe in the housing, a second set of said three sets of break tabs engaging the flange of the barrel of the syringe after the first set of break tabs is broken by movement of the cap, a third set of said three sets of break tabs engaging the flange of the plunger of the syringe after the first set and the second set of break tabs are broken, the third set of said three sets of break tabs being broken upon movement of the cap along the barrel after breaking of the first and second sets of break tabs, the first set of break tabs projecting into the interior of the cap less than the second and third sets of break tabs and the second set of break tabs projecting into the interior of the cap less than the third set of break tabs. - View Dependent Claims (3, 4)
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5. A single use injector comprising:
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a container for medication;
an expulsion device for expelling the medication from the container;
a needle for delivering the expelled medication through the skin of a patient;
an operating mechanism designed to apply hand pressure to push the needle through the skin and to operate the expulsion device;
a spring-action mechanism to withdraw the needle into the operation mechanism after use; and
a detent releasing in response to hand pressure greater than a predetermined value so that the operating mechanism is caused to operate in two stages;
a) a first stage, before release of the detent, in which the application of pressure pushes the needle through the skin, and b) a second stage, after release of the detent, in which continued application of pressure operates the expulsion device. - View Dependent Claims (6, 7, 8, 9)
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10. A single use injector device for dispensing medication from a pre-filled syringe and sealing the syringe in the device after use, the pre-filled syringe including a blister having a predetermined dose of a drug, a hollow hub, a collar and a needle mounted on the collar, the single use injector comprising:
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a shaped moulding for engaging the blister, a barrel, a spring located in the barrel, and a cap slidably mounted on the barrel progressively moving along a longitudinal axis of the barrel while the needle of the syringe is moved from an interior of the barrel to an exterior of the barrel and delivery of the predetermined dose of the drug and retraction of the needle into the barrel after use to prevent exposure to the used needle. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification