Prefilled syringe with breakaway force feature
First Claim
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1. A jet injector, comprising:
- a prefilled syringe comprising;
a container portion defining a fluid chamber containing a medicament and defining a longitudinal axis therethrough;
an injection-assisting needle disposed at the distal end of the chamber, having an injecting tip configured for piercing an insertion location, and defining a fluid pathway in fluid communication with the chamber for injecting the fluid from the chamber into an injection site;
a plunger movable within the fluid chamber;
a housing that houses the prefilled syringe and is configured for allowing insertion of the needle at the injection location to an insertion point that is at a penetration depth below the surface, the housing comprising;
a retractable guard that is movable between a protecting position in which the needle is disposed within the guard and an injecting position in which the tip of the needle is exposed for insertion to the insertion point, andan interference component adjacent to the retractable guard, the interference component being a ring having at least one abutment arm, the abutment arm having at least one tapered portion and an engagement portion axially adjacent to the at least one tapered portion, the engagement portion comprising a surface angled relative to an incline of the tapered portion, the angled surface of the engagement portion extending radially outward relative to the longitudinal axis and from a proximal end of the tapered portion and is configured to block and cause resistance to the movement of the retractable guard when the retractable guard is moved at least partially from the protecting position toward the injecting position;
a syringe support supportively mounting the prefilled syringe in the housing;
an energy source configured for biasing the plunger with a force selected to produce an injecting pressure on the medicament in the fluid chamber to jet inject the medicament from the fluid chamber through the needle to the injection site.
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Abstract
A jet injector that includes a prefilled syringe. The syringe includes a fluid chamber that contains a medicament. The syringe also has an injection-assisting needle, and a plunger is movable within the fluid chamber. A housing is configured for allowing insertion of the needle to a penetration depth. The housing includes a retractable guard and an interference component, e.g., a lock ring, adjacent to the retractable guard that interferes with the movement of the retractable guard. An energy source is configured for biasing the plunger to produce an injecting pressure to jet inject the medicament from the fluid chamber through the needle to an injection site.
425 Citations
22 Claims
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1. A jet injector, comprising:
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a prefilled syringe comprising; a container portion defining a fluid chamber containing a medicament and defining a longitudinal axis therethrough; an injection-assisting needle disposed at the distal end of the chamber, having an injecting tip configured for piercing an insertion location, and defining a fluid pathway in fluid communication with the chamber for injecting the fluid from the chamber into an injection site; a plunger movable within the fluid chamber; a housing that houses the prefilled syringe and is configured for allowing insertion of the needle at the injection location to an insertion point that is at a penetration depth below the surface, the housing comprising; a retractable guard that is movable between a protecting position in which the needle is disposed within the guard and an injecting position in which the tip of the needle is exposed for insertion to the insertion point, and an interference component adjacent to the retractable guard, the interference component being a ring having at least one abutment arm, the abutment arm having at least one tapered portion and an engagement portion axially adjacent to the at least one tapered portion, the engagement portion comprising a surface angled relative to an incline of the tapered portion, the angled surface of the engagement portion extending radially outward relative to the longitudinal axis and from a proximal end of the tapered portion and is configured to block and cause resistance to the movement of the retractable guard when the retractable guard is moved at least partially from the protecting position toward the injecting position; a syringe support supportively mounting the prefilled syringe in the housing; an energy source configured for biasing the plunger with a force selected to produce an injecting pressure on the medicament in the fluid chamber to jet inject the medicament from the fluid chamber through the needle to the injection site. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A jet injector, comprising:
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a prefilled syringe comprising; a container portion defining a fluid chamber containing a medicament and defining a longitudinal axis therethrough; an injection-assisting needle disposed at the distal end of the chamber, having an injecting tip configured for piercing an insertion location, and defining a fluid pathway in fluid communication with the chamber for injecting the fluid from the chamber into an injection site; a plunger movable within the fluid chamber; a housing that houses the prefilled syringe and is configured for allowing insertion of the needle at the injection location to an insertion point that is at a penetration depth below the surface, the housing comprising; a retractable guard that is movable between a protecting position in which the needle is disposed within the guard and an injecting position in which the tip of the needle is exposed for insertion to the insertion point, and an interference component adjacent to the retractable guard, the interference component having at least one abutment arm, the abutment arm having at least one tapered portion and an engagement portion axially adjacent to the at least one tapered portion, the engagement portion comprising a surface angled relative to an incline of the tapered portion, the angled surface of the engagement portion extending radially outward relative to the longitudinal axis and from a proximal end of the tapered portion and is configured to block and cause resistance to the movement of the retractable guard when the retractable guard is moved at least partially from the protecting position toward the injecting position; a syringe support supportively mounting the prefilled syringe in the housing; an energy source configured for biasing the plunger with a force selected to produce an injecting pressure on the medicament in the fluid chamber to jet inject the medicament from the fluid chamber through the needle to the injection site. - View Dependent Claims (22)
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Specification