Syringe having a retractable needle
First Claim
1. A medical device for delivering a medicament to a patient, comprising:
- a barrel having a forward end and a rear end and defining a reservoir within which the medicament may be contained;
a needle cannula having a forward tip and a rear end;
a needle cannula hub connected to said rear end of said needle cannula and providing fluid communication of said needle cannula with said reservoir, said needle cannula hub being selectively movable between an initial position in which said forward tip of said needle cannula is exposed, and a retracted position in which said forward tip of said needle cannula is disposed in said device;
a barrel hub member coupled to said forward end of said barrel over said needle cannula hub and dimensioned to provide retractable telescoping movement of said needle cannula hub with respect to said barrel hub member to allow said needle cannula hub to move to said retracted position;
a retaining member seated between said forward end of said barrel and said barrel hub member for releasably securing said needle cannula hub at said barrel forward end when said needle cannula hub is in said initial position;
an urging member in contact with said needle cannula hub and said barrel hub for exerting a force to bias said needle cannula hub from said initial position to said retracted position; and
a plunger rod having a hollow first end bounded by an edge and supporting a stopper and positioned in said reservoir, and a second end having a thumb pad for receiving medicament delivery pressure for causing said plunger to move within said reservoir to cause the medicament to be expelled from said reservoir, said plunger edge configured for piercing said stopper when said stopper is fully inserted into said barrel and for interacting with said retaining member to release said needle cannula hub from said retaining member and enable said needle cannula hub to move, by said urging member, to said retracted position through said hollow front end of said plunger rod.
1 Assignment
0 Petitions
Accused Products
Abstract
A medical device for delivering a medicament to a patient. The device includes a syringe barrel with a plunger having a hollow front end and a stopper positioned over the plunger front end to seal the plunger front end. The stopper is movably inserted in the barrel to expel medicament in the barrel. A needle cannula is fixed to a needle cannula hub and is movable between an initial position in which the forward tip of the needle cannula is exposed and a retracted position in which the forward tip is contained within the medical device. A plug seal releasably secures the needle cannula hub to an end of the barrel, and a hub adapter secures the plug seal to the barrel end. A cutter positioned on the plunger pierces the stopper when the stopper is pressed against the plug seal to open the hollow front end of the plunger. The plunger also engages the plug seal to allow the needle cannula hub to move, via an urging member, to the retracted position through the front end of the plunger.
227 Citations
33 Claims
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1. A medical device for delivering a medicament to a patient, comprising:
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a barrel having a forward end and a rear end and defining a reservoir within which the medicament may be contained;
a needle cannula having a forward tip and a rear end;
a needle cannula hub connected to said rear end of said needle cannula and providing fluid communication of said needle cannula with said reservoir, said needle cannula hub being selectively movable between an initial position in which said forward tip of said needle cannula is exposed, and a retracted position in which said forward tip of said needle cannula is disposed in said device;
a barrel hub member coupled to said forward end of said barrel over said needle cannula hub and dimensioned to provide retractable telescoping movement of said needle cannula hub with respect to said barrel hub member to allow said needle cannula hub to move to said retracted position;
a retaining member seated between said forward end of said barrel and said barrel hub member for releasably securing said needle cannula hub at said barrel forward end when said needle cannula hub is in said initial position;
an urging member in contact with said needle cannula hub and said barrel hub for exerting a force to bias said needle cannula hub from said initial position to said retracted position; and
a plunger rod having a hollow first end bounded by an edge and supporting a stopper and positioned in said reservoir, and a second end having a thumb pad for receiving medicament delivery pressure for causing said plunger to move within said reservoir to cause the medicament to be expelled from said reservoir, said plunger edge configured for piercing said stopper when said stopper is fully inserted into said barrel and for interacting with said retaining member to release said needle cannula hub from said retaining member and enable said needle cannula hub to move, by said urging member, to said retracted position through said hollow front end of said plunger rod. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A medical device for delivering a medicament to a patient, comprising:
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a barrel having a forward end and a rear end and defining a reservoir within which the medicament may be contained;
a needle cannula having a forward tip and a rear end;
a needle cannula hub connected to said rear end of said needle cannula and providing fluid communication of said needle cannula with said reservoir, said needle cannula hub being selectively movable between an initial position in which said forward tip of said needle cannula is exposed, and a retracted position in which said forward tip of said needle cannula is disposed in said device;
a barrel hub member coupled to said forward end of said barrel over said needle cannula hub and dimensioned to provide retractable telescoping movement of said needle cannula hub with respect to said barrel hub member to allow said needle cannula hub to move to said retracted position;
means for releasably securing said needle cannula hub at said barrel forward end when said needle cannula hub is in said first position;
urging means disposed between said barrel hub member and said needle cannula hub for urging said needle cannula hub to said retracted position when said releasably securing means is activated; and
a plunger rod having a hollow first end supporting a stopper and positioned in said reservoir, and a second end having a thumb pad for receiving medicament delivery pressure for causing said plunger to move within said reservoir to cause the medicament to be expelled from said reservoir, said plunger comprising means for piercing said stopper when said stopper is fully inserted into said barrel and means for activating said releasably securing means for allowing said urging means to move said needle cannula hub to said retracted position through said hollow first end of said plunger rod. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification