Predetermined dosage hypodermic syringe system
First Claim
1. A hypodermic syringe system for injecting a predetermined amount of a therapeutic fluid into tissue of a living body comprising:
- A) an elongated plunger extending between a proximal end and a distal end and having;
1) a piston-like head member on said distal end and2) a thumb plate on said proximal end;
B) a one-piece unitary elongated barrel member having a longitudinal axis and extending between a distal end and a proximal end and defining a smooth walled cylindrical chamber of uniform diameter for slidably receiving said distal end of said plunger therein, said barrel member including;
1) a front wall at said distal end thereof,2) an outwardly extending rim at said proximal end defining a breech-loading opening through which said distal end of said plunger can extend, and3) a hub member integral with said front wall mounting a double ended hypodermic needle including a first sharpened end for piercing engagement with the body tissue and a second sharpened end opposite said first end, the tip of said second end extending through the front wall of the barrel member, said needle being in substantial alignment with the longitudinal axis of said barrel member; and
C) a sealed collapsible needle-penetrable capsule containing a predetermined dose of the therapeutic liquid to be injected, said capsule loosely fitting within the chamber of said barrel member between the head member of said plunger and the tip of the second end of said needle, said capsule being insertable through the breech-loading opening of the barrel prior to insertion of the plunger.
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Accused Products
Abstract
A hypodermic syringe system for injecting a predetermined dosage of therapeutic fluid into body tissue of a living patient. A sealed capsule contains the fluid to be injected. A double ended hypodermic needle includes a first sharpened end for piercing engagement with the body tissue and a second sharpened end opposite therefrom for piercing engagement with the capsule. The capsule is disposed between the end of a plunger which is slidably engaged within a barrel member supporting the needle and the end wall of the barrel member. Advancement of the plunger moves the capsule into piercing engagement with the second sharpened end of the needle, collapsing the capsule and discharging the therapeutic fluid through the needle and into the body tissue. A safety syringe with a retractable needle is disclosed. The system is also provided with an aspirating capability to inform the user whether or not a blood vessel has been pierced by the needle.
34 Citations
18 Claims
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1. A hypodermic syringe system for injecting a predetermined amount of a therapeutic fluid into tissue of a living body comprising:
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A) an elongated plunger extending between a proximal end and a distal end and having; 1) a piston-like head member on said distal end and 2) a thumb plate on said proximal end; B) a one-piece unitary elongated barrel member having a longitudinal axis and extending between a distal end and a proximal end and defining a smooth walled cylindrical chamber of uniform diameter for slidably receiving said distal end of said plunger therein, said barrel member including; 1) a front wall at said distal end thereof, 2) an outwardly extending rim at said proximal end defining a breech-loading opening through which said distal end of said plunger can extend, and 3) a hub member integral with said front wall mounting a double ended hypodermic needle including a first sharpened end for piercing engagement with the body tissue and a second sharpened end opposite said first end, the tip of said second end extending through the front wall of the barrel member, said needle being in substantial alignment with the longitudinal axis of said barrel member; and C) a sealed collapsible needle-penetrable capsule containing a predetermined dose of the therapeutic liquid to be injected, said capsule loosely fitting within the chamber of said barrel member between the head member of said plunger and the tip of the second end of said needle, said capsule being insertable through the breech-loading opening of the barrel prior to insertion of the plunger. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A hypodermic syringe system for injecting a therapeutic fluid into tissue of a living body comprising:
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A) a one-piece unitary elongated tubular barrel member having a longitudinal axis and extending between a front wall at the distal end and an annular operating outwardly extending flange at the proximal end and including an inner wall defining a smooth walled cylindrical chamber of uniform diameter therein, said operating flange defining a breech-loading opening into the chamber; B) a hypodermic needle including a first sharpened end for piercing engagement with the body tissue; C) a hub member integral with said front wall for mounting said needle so as to be substantially aligned with said longitudinal axis; D) an elongated plunger for slidable reception through the proximal opening into the chamber of said barrel, said plunger extending between a proximal end and a distal end and including a piston-like head member on said distal end and a thumb plate on said proximal end; and E) said head member including sealing means in fluid tight sealing engagement with the wall of the chamber of said barrel member when said plunger is moved in the proximal direction to form a vacuum within the chamber between the head member and front wall of the barrel member, and having means to permit escape of air from said chamber through or around said head member when said plunger is moved in the distal direction. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification