Pistol-type syringe
First Claim
1. A pistol-type syringe for injecting the contents of an ampoule having therein a piston which discharges the contents upon axial displacement, said syringe comprising:
- a handle member having an upper portion with a first generally flat frontal surface and having an axial bore extending therethrough;
an elongated plunger member longitudinally displaceably positioned in the bore;
means, associated with the upper portion of said handle member, for holding an ampoule in a position forward of said handle member and substantially coaxial with said plunger;
a generally disk-shaped first pressure piece having an aperture therein which is slightly larger than the outer circumference of said plunger member, said first pressure piece being slidably positioned on said plunger member and having a rest position defined by said first surface of said upper portion of said handle member, said rest position being generally perpendicular to the axis of said bore; and
an actuating lever pivotably mounted on said handle, the upper end of said lever being adapted upon pivoting of said lever to exert a force on said pressure piece in a direction generally parallel to said plunger member and at a position on said first pressure piece spaced radially outwardly from said plunger member.
1 Assignment
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Accused Products
Abstract
Disclosed is a pistol-type syringe for injecting the contents of an ampoule or the like by means of an axial displaceable piston. The syringe includes a handle member with a generally flat frontal surface having a bore through which an axially displaceable plunger member is positioned. The ampoule or the like is held in a position coaxial with the plunger. The plunger is provided with a generally disk-shaped pressure piece which is slidable along the plunger and which has a rest position defined by the flat frontal surface of the handle member. The handle member also has an associated activating lever which is operable to exert a force on the pressure piece.
42 Citations
13 Claims
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1. A pistol-type syringe for injecting the contents of an ampoule having therein a piston which discharges the contents upon axial displacement, said syringe comprising:
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a handle member having an upper portion with a first generally flat frontal surface and having an axial bore extending therethrough; an elongated plunger member longitudinally displaceably positioned in the bore; means, associated with the upper portion of said handle member, for holding an ampoule in a position forward of said handle member and substantially coaxial with said plunger; a generally disk-shaped first pressure piece having an aperture therein which is slightly larger than the outer circumference of said plunger member, said first pressure piece being slidably positioned on said plunger member and having a rest position defined by said first surface of said upper portion of said handle member, said rest position being generally perpendicular to the axis of said bore; and an actuating lever pivotably mounted on said handle, the upper end of said lever being adapted upon pivoting of said lever to exert a force on said pressure piece in a direction generally parallel to said plunger member and at a position on said first pressure piece spaced radially outwardly from said plunger member. - View Dependent Claims (2, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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3. A pistol type-syringe for injecting the contents of an ampoule having therein a piston which discharges the contents upon axial displacement, said syringe comprising:
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a handle member having at its upper portion a bore extending therethrough; an elongated plunger member longitudinally displaceably positioned in the bore; ampoule holding means, associated with the upper portion of said handle member for holding an ampoule in a position forward of said handle member and substantially coaxial with said plunger; said ampoule holding means comprising a tubular guide piece connected to said handle member, said guide piece having radially opposing longitudinal extensions extending in the forward direction, a generally tubular ampoule holder pivotably mounted on said extension for rotation into and out of coaxial alignment with said guide piece, a third pressure piece having an aperture therein larger than the circumference of said plunger member, said third pressure piece being slidably positioned inside of said guide piece and having a front portion which has an outer dimension equal to the inner dimension of said ampoule holder, means for normally spring biasing said third pressure piece forwardly so that said front portion extends into said ampoule holder, and means for selectively withdrawing said front portion from said ampoule holder so that said ampoule holder can be rotated for insertion and removal of an ampoule from the rear; a generally disk-shaped first pressure piece having an aperture therein which is slightly larger than the outer circumference of said plunger member, said first pressure piece being slideably positioned on said plunger member; and an actuating lever pivotingly mounted on said handle, the upper end of said lever being adapted upon pivoting of said lever to exert a force on said pressure piece in a direction generally parallel to said plunger member and at a position on said first pressure piece spaced radially outwardly from said plunger member.
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Specification