Syringe with Disabling Mechanism
First Claim
1. A syringe assembly comprising:
- a barrel including a cylindrical sidewall having an interior surface defining a chamber for retaining fluid, an open proximal end and a distal end including a distal wall having an opening therethrough in fluid communication with said chamber;
an elongate plunger rod including a proximal end, a distal end, and a main body extending between the proximal and distal end, the plunger rod being distally and proximally movable within said chamber, the proximal end including a thumb press having proximal end, a distal end, and a diameter, the distal end of the plunger rod including a stopper-engaging portion;
an annular extension protruding from the proximal end of the barrel having a diameter greater than the diameter of the thumb press;
a stopper having a proximal end and a distal end, the stopper attached to the stopper-engaging portion of the plunger rod, such that when the distal end of the stopper is in contact with the distal wall of the barrel, the thumb press is permitted to advance distally into the annular extension and the annular extension at least partially envelopes a portion of the thumb press to prevent the user from accessing the thumb press and moving the plunger rod in a proximal direction.
1 Assignment
0 Petitions
Accused Products
Abstract
Syringe assemblies having a passive disabling system to prevent reuse are provided. In one embodiment, the passive disabling system activates after completion of an injection cycle. An exemplary syringe assembly incorporates a stopper and plunger rod attached in a manner to prevent users from disassembling the syringe prior to completion of the injection cycle. The barrel may also include an annular extension or collar that extends from the proximal end of the barrel. In a specific configuration, the annular extension at least partially envelopes a portion of the thumb press to prevent the user from accessing the thumb press and moving the plunger rod in a proximal direction Syringe assemblies of one or more embodiments also include visual indicators or markers indicating whether a syringe assembly is used or the plunger rod is locked within the barrel.
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Citations
42 Claims
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1. A syringe assembly comprising:
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a barrel including a cylindrical sidewall having an interior surface defining a chamber for retaining fluid, an open proximal end and a distal end including a distal wall having an opening therethrough in fluid communication with said chamber; an elongate plunger rod including a proximal end, a distal end, and a main body extending between the proximal and distal end, the plunger rod being distally and proximally movable within said chamber, the proximal end including a thumb press having proximal end, a distal end, and a diameter, the distal end of the plunger rod including a stopper-engaging portion; an annular extension protruding from the proximal end of the barrel having a diameter greater than the diameter of the thumb press; a stopper having a proximal end and a distal end, the stopper attached to the stopper-engaging portion of the plunger rod, such that when the distal end of the stopper is in contact with the distal wall of the barrel, the thumb press is permitted to advance distally into the annular extension and the annular extension at least partially envelopes a portion of the thumb press to prevent the user from accessing the thumb press and moving the plunger rod in a proximal direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A syringe assembly comprising:
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a barrel including a cylindrical sidewall having an interior surface defining a chamber for retaining fluid, an open proximal end and a distal end including a distal wall having an opening therethrough in fluid communication with said chamber, the chamber further having a first inner diameter; an elongate plunger rod having a proximal end, a distal end, a stopper-engaging portion located at the distal end of the plunger rod, a thumb press having a proximal end, a distal end, a diameter and a length at the proximal end of the plunger rod, a main body portion extending between the distal and proximal ends of the plunger rod; an annular extension protruding from the proximal end of the barrel configured to form a nestable arrangement with at least a portion of the length of the thumb press at the distal end of the thumb press; and a stopper having a proximal end and a distal end, the stopper attached to the stopper-engaging portion of the plunger rod, such that when the distal end of the stopper is in contact with the distal wall of the barrel, the thumb press is permitted to advance distally and nestably engage with the annular extension to prevent the user from engaging the thumb press to move the plunger rod in a proximal direction. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38)
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39. A syringe assembly comprising:
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a barrel including a cylindrical sidewall having an interior surface defining a chamber for retaining fluid, an open proximal end and a distal end including a distal wall having an opening therethrough in fluid communication with said chamber; an elongate plunger rod having a proximal end, a distal end, a stopper-engaging portion located at the distal end of the plunger rod, a thumb press at the distal end of the plunger rod, and a main body portion extending between the distal and proximal ends of the plunger rod; a stopper having a proximal end and a distal end, the stopper attached to the stopper-engaging portion of the plunger rod, means for preventing removal of the plunger rod from the barrel to prevent reuse of the syringe assembly when the distal end of the stopper is in contact with the distal wall of the barrel and distal force is applied to the thumb press; and means for separating stopper from the stopper-engaging portion upon application of sufficient proximal force to the plunger rod. - View Dependent Claims (40, 41, 42)
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Specification