초록 ▼

A hand-operated syringe for injecting a liquid under high pressure. The syringe has an elongated barrel with proximal and distal ends, the barrel having opposing finger grips at its proximal end with each finger grip having a proximal inner portion defining a most proximal pressure point closely adj

A hand-operated syringe for injecting a liquid under high pressure. The syringe has an elongated barrel with proximal and distal ends, the barrel having opposing finger grips at its proximal end with each finger grip having a proximal inner portion defining a most proximal pressure point closely adjacent the barrel, the pressure points defining a plane substantially perpendicular to the barrel's axis. A plunger is received in the barrel and has a proximal end that includes a pressure surface adapted to receive manual pressure. The pressure surface of the plunger and the finger pressure points are arranged so that when the plunger is in its fully inserted position, its pressure surface is spaced distally of the plane defined by the finger pressure points.

대표청구항 ▼

What is claimed is: 1. A hand operated syringe for injecting a liquid, comprising: a) an elongated barrel having proximal and distal ends and an exit orifice at its distal end; b) a pair of opposing finger grips for reception of the index and middle fingers, respectively, of a user's hand and carri

What is claimed is: 1. A hand operated syringe for injecting a liquid, comprising: a) an elongated barrel having proximal and distal ends and an exit orifice at its distal end; b) a pair of opposing finger grips for reception of the index and middle fingers, respectively, of a user's hand and carried at the proximal end of the barrel, each grip having a generally distally facing gripping surface having an arcuate portion nearer the barrel than any other arcuate gripping surface portion and defining a most proximal point on said arcuate gripping surface to which finger pressure is applied proximally during operation of the syringe, said points defining a plane substantially perpendicular to the barrel's axis; c) a plunger received in the barrel and having a proximal end protruding from the barrel, said proximal end including a pressure surface adapted to receive manual pressure; the plunger being movable between retracted and fully inserted positions within the barrel to discharge a volume of liquid through the exit orifice, the pressure surface of the plunger and the finger pressure points closely adjacent the barrel being so arranged that when the plunger is in its fully inserted position, its pressure surface is spaced distally of said plane. 2. The syringe of claim 1 wherein the volume is from about 3 cm3 to about 20 cm3. 3. The syringe of claim 1 wherein the volume is from about 5 cm3 to about 10 cm3. 4. A hand operated syringe for injecting a liquid, comprising: a) an elongated barrel having proximal and distal ends and an exit orifice at its distal end, the elongated barrel having a substantially constant diameter; b) a pair of opposing finger grips for reception of the index and middle fingers, respectively, of a user's hand and spaced apart at least the diameter of the barrel and carried at the proximal end of the barrel, each grip having a generally distally facing gripping surface having an arcuate portion nearer the barrel than any other arcuate gripping surface portion and defining a finger pressure point to which finger pressure is applied proximally during operation of the syringe, said points defining a plane substantially perpendicular to the barrel's axis; c) a plunger received in the barrel and having a proximal end protruding from the barrel, said proximal end including a pressure surface adapted to receive manual pressure; the plunger being movable between retracted and fully inserted positions within the barrel to discharge a volume of liquid through the exit orifice, the pressure surface of the plunger and the finger pressure points closely adjacent the barrel being so arranged that when the plunger is in its fully inserted position, its pressure surface is spaced distally of said plane. 5. The syringe of claim 1 wherein said discharge volume is from about 3 cm3 to about 20 cm3. 6. The syringe of claim 1 wherein said discharge volume is from about 5 cm3 to about 10 cm3. 7. The syringe of claim 1 wherein said barrel defines a fluid reservoir having a cross-sectional area A wherein area A is less than 0.3 square inches. 8. The syringe of claim 7 wherein area A is about 0.2 square inches. 9. They syringe of claim 1 wherein said plunger is movable through a stroke length S between retracted and fully inserted positions within the barrel, and wherein, when the plunger is in its fully inserted position, its pressure surface is spaced distally of said plane by a distance L that is greater than or equal to about 0.02 S. 10. The syringe of claim 9 wherein distance L is about 0.06 S. 11. A hand operated syringe for injecting a liquid, comprising: a) an elongated barrel having proximal and distal ends and an exit orifice at its distal end; b) a pair of opposing finger grips for reception of fingers of a user's hand and carried at the proximal end of the barrel, each finger grip having a generally distally facing gripping surface having a pressure point at its center to which finger pressure is applied proximally during operation of the syringe, said pressure points defining a plane substantially perpendicular to the barrel's axis; c) a plunger received in the barrel and having a proximal end protruding from the barrel, said proximal end including a pressure surface adapted to receive manual pressure; the plunger being movable between retracted and fully inserted positions within the barrel to discharge a volume of liquid through the exit orifice, the pressure surface of the plunger and the finger pressure points closely adjacent the barrel being so arranged that when the plunger is in its fully inserted position, its pressure surface is spaced distally of said plane. 12. The syringe of claim 11 wherein each of said gripping surfaces is arcuate, and wherein said pressure point is at the most proximal point of said arcuate gripping surface. 13. The syringe of claim 11 or claim 12 wherein said finger grips each are configured as circular openings sized to receive only a single finger. 14. A hand operated syringe for injecting a liquid, comprising: a) an elongated barrel having proximal and distal ends and an exit orifice at its distal end; b) a pair of opposing finger grips carried at the proximal end of the barrel and spaced apart at least the diameter of the barrel, each having a generally distally facing gripping surface against which finger pressure is applied proximally during operation of the syringe, each gripping surface having one finger pressure point that is more closely adjacent to the barrel than any other finger pressure point of said gripping surface, said more closely adjacent pressure points defining a plane substantially perpendicular to the barrel's axis, c) a plunger received in the barrel and having a proximal end protruding from the barrel, said proximal end including a pressure surface adapted to receive manual pressure; the plunger being movable between retracted and fully inserted positions within the barrel to discharge a volume of liquid through the exit orifice, the pressure surface of the plunger and the finger pressure points closely adjacent the barrel being so arranged that when the plunger is in its fully inserted position, its pressure surface is spaced distally of said plane.