Device for manually controlling delivery rate of a hypodermic syringe and syringe having same
First Claim
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1. An injection retarder syringe attachment for manually controlling the delivery rate of a hand-held hypodermic syringe, comprising:
- a main body having a proximal section and a distal section, said distal section having a clip substantially immovably securable onto a hypodermic syringe, said proximal section of said main body at least partially extending above the finger grips of the barrel adjacent to a plunger of the syringe, but extending on only one side of the plunger, when said clip is secured to the syringe; and
a thumb tip rest including a surface formed on said proximal section of said main body outside of and above the syringe barrel and unobstructed by any other portion of said syringe attachment adapted to allow a user to place a tip of a thumb substantially orthogonally on said surface during dispensing of contents of the syringe, said thumb tip rest adapted to allow the user to selectively slow a rate of progress of the plunger into the barrel,wherein when the user applies force to the head of the plunger with the pad of the thumb while the tip of the thumb is pressing on said thumb tip rest, with said thumb tip rest remaining stationary with respect to the syringe so as to act as a fulcrum for the thumb, force is substantially applied about an axis through the upper thumb joint.
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Abstract
An injection retarder for mechanically/manually reducing the rate of delivery of a hand-held hypodermic syringe and a syringe having same are provided. The injection retarder and syringe include means for selectively slowing a rate of progress of the plunger into the barrel. For example, a thumb tip rest is provided against which the thumb may be braced, thereby providing additional mechanical advantage and much finer manual control of the rate of injection. Alternatively, a set of teeth and an opposing mating tooth or pawl are provided which increase friction and slow the progress of the plunger.
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Citations
19 Claims
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1. An injection retarder syringe attachment for manually controlling the delivery rate of a hand-held hypodermic syringe, comprising:
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a main body having a proximal section and a distal section, said distal section having a clip substantially immovably securable onto a hypodermic syringe, said proximal section of said main body at least partially extending above the finger grips of the barrel adjacent to a plunger of the syringe, but extending on only one side of the plunger, when said clip is secured to the syringe; and a thumb tip rest including a surface formed on said proximal section of said main body outside of and above the syringe barrel and unobstructed by any other portion of said syringe attachment adapted to allow a user to place a tip of a thumb substantially orthogonally on said surface during dispensing of contents of the syringe, said thumb tip rest adapted to allow the user to selectively slow a rate of progress of the plunger into the barrel, wherein when the user applies force to the head of the plunger with the pad of the thumb while the tip of the thumb is pressing on said thumb tip rest, with said thumb tip rest remaining stationary with respect to the syringe so as to act as a fulcrum for the thumb, force is substantially applied about an axis through the upper thumb joint. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A hand-held hypodermic syringe with integral manual dosage rate control, comprising:
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a barrel; a plunger reciprocatably movable into and out of said barrel; and a thumb tip rest substantially immovably formed at a proximal end of said barrel outside and above said barrel and including a surface outside and above said syringe barrel adjacent said plunger and unobstructed by any other portion of said syringe adapted to allow a user to place a tip of a thumb substantially orthogonally thereupon during dispensing of contents of said syringe, said thumb tip rest adapted to allow the user to selectively slow a rate of progress of said plunger into said barrel, wherein when the user applies force to a head of said plunger with the pad of the thumb while the tip of the thumb is pressing on said thumb tip rest, with said thumb tip rest remaining stationary with respect to said syringe so as to act as a fulcrum for the thumb, force is substantially applied about an axis through the upper thumb joint. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification