Syringe shield
First Claim
Patent Images
1. A syringe comprising:
- a barrel having an hypodermic needle mounted on one end thereof, a piston mounted for movement longitudinally within the barrel and connected to a handle that projects from the opposite end of said barrel;
wherein said barrel is tubular and at least partially transparent in a portion that extends over the major part of its length;
a tubular sleeve dimensioned to fit over the barrel, and guided to slide axially thereon between an extended position wherein it projects from said one end of the barrel beyond the tip of said needle and a retracted position wherein it coaxially surrounds said barrel and exposes said needle for use, said sleeve having a length that corresponds to that of said barrel and comprising a tubular wall that is at least partially transparent such that in said retracted position it affords unimpeded visibility of substantially the entire length of said transparent portion of said barrel;
retaining means to secure said sleeve when in the retracted position, said retaining means being effective to prevent any inadvertent axial or rotational movement of said sleeve relative to said barrel; and
locking means for securely and non-releasably locking the sleeve in said extended position, in which position the needle is fully covered to prevent injury to a user by the needle.
0 Assignments
0 Petitions
Accused Products
Abstract
Disclosed are hypodermic syringes having special safety features for preventing the user from inadvertently pricking himself with the needle. In the preferred embodiment the barrel of, for example, a syringe is provided with a sleeve that can be drawn out over the needle and firmly locked into position to prevent accidental contact of the user with the needle.
-
Citations
21 Claims
-
1. A syringe comprising:
-
a barrel having an hypodermic needle mounted on one end thereof, a piston mounted for movement longitudinally within the barrel and connected to a handle that projects from the opposite end of said barrel;
wherein said barrel is tubular and at least partially transparent in a portion that extends over the major part of its length;a tubular sleeve dimensioned to fit over the barrel, and guided to slide axially thereon between an extended position wherein it projects from said one end of the barrel beyond the tip of said needle and a retracted position wherein it coaxially surrounds said barrel and exposes said needle for use, said sleeve having a length that corresponds to that of said barrel and comprising a tubular wall that is at least partially transparent such that in said retracted position it affords unimpeded visibility of substantially the entire length of said transparent portion of said barrel; retaining means to secure said sleeve when in the retracted position, said retaining means being effective to prevent any inadvertent axial or rotational movement of said sleeve relative to said barrel; and locking means for securely and non-releasably locking the sleeve in said extended position, in which position the needle is fully covered to prevent injury to a user by the needle. - View Dependent Claims (2, 3, 4)
-
-
5. A syringe comprising:
-
a barrel having an hypodermic needle mounted on one end thereof said needle including a tip portion, a piston mounted for movement longitudinally within the barrel and connected to a handle that projects from an opposite end of said barrel;
wherein said barrel is tubular;a tubular sleeve dimensioned to fit over the barrel, and mounted to slide axially thereon between an extended position wherein at least a portion of said tubular sleeve projects from said one end of the barrel beyond the tip portion of said needle and a retracted position wherein said tubular sleeve coaxially surrounds said barrel and exposes said needle for use, said sleeve including an internal projection; locking means for securely locking said sleeve in said extended position in which said needle is fully covered to prevent injury to a user by said needle, said locking means comprising walls on said barrel that define a locking recess in said barrel into which locking recess said internal projection can be positioned by predetermined rotational movement of said sleeve relative to said barrel in said extended position, said barrel including a radially inclined ramp adjacent one of said walls of said locking means to guide and facilitate entry of said projection into said locking recess by said predetermined rotational movement of said sleeve relative to said barrel in said extended position; and retaining means to releasably secure said sleeve when in the retracted position against axial movement relative to said barrel. - View Dependent Claims (6, 7, 8, 9, 10)
-
-
11. A medical device comprising:
-
a barrel having a hypodermic needle mounted on one end thereof, said hypodermic needle including a tip portion, said barrel being of cylindrical form over a portion of its length; a sleeve dimensioned to fit over said barrel, and mounted to be slidable between an extended position wherein said sleeve projects from said one end of said barrel beyond the tip portion of said needle and a retracted position wherein said sleeve coaxially surrounds said barrel and exposes said needle for use; locking means for securely locking said sleeve in said extended position in which said needle is fully covered to prevent injury to a user by said needle, said locking means comprising walls that define a locking recess in said barrel into which recess said internal projection can be positioned by predetermined movement of said sleeve relative to said barrel in said extended position, said barrel including an inclined ramp that approaches said locking recess to guide and facilitate entry of said projection into said recess; and a retaining means to releasably secure said sleeve when in said retracted position against axial movement relative to said barrel.
-
-
12. A medical device comprising:
-
a barrel having a hypodermic needle mounted on one end thereof, said hypodermic needle including a tip portion, said barrel being of cylindrical form over the major portion of its length; a sleeve dimensioned to fit over said barrel, and mounted to be slidable there along, said sleeve being movable axially between an extended position wherein it projects from said one end of said barrel beyond the tip portion of said needle and a retracted position wherein it coaxially surrounds said barrel and exposes said needle for use; a projection on the inside of said sleeve, a mating groove extending along the outside of said barrel, an inclined ramp extending transversely from said groove and terminating in a recess that comprises locking means for securely locking said sleeve in said extended position in which said needle is fully covered to prevent injury to a user by said needle, said recess being dimensioned to accommodate and retain said projection, said projection being movable along said groove as said sleeve is moved axially along said barrel until said projection registers with said ramp, further rotational movement of said sleeve causing said projection to move up said ramp and then to drop into said recess to lock said sleeve in the extended position; and retaining means to releasably secure said sleeve when in said retracted position against axial movement relative to said barrel. - View Dependent Claims (13, 14, 15)
-
-
16. A medical device comprising:
-
a tubular barrel having a hypodermic needle coaxially mounted at a distal end thereof, said hypodermic needle including a tip; a sleeve dimensioned to fit over said barrel and mounted to be axially movable there along between an extended position wherein said needle tip is covered and a retracted position wherein said needle tip is exposed; a projection on the inside of said sleeve, a mating groove extending axially along the outside of said barrel, an inclined ramp extending transversely from said groove and terminating in a wall projecting from said barrel, said projection being axially movable along said groove from said retracted position in response to axial movement of said sleeve along said barrel until said projection is aligned with said ramp, said projection then being rotatably movable relative to said barrel in response to rotational movement of said sleeve relative to said barrel to move said projection along said inclined ramp to a position atop said wall, continued rotational movement of said sleeve relative to said barrel causing said projection to move from atop said wall to a position behind said wall.
-
-
17. A medical device comprising:
-
a barrel having a hypodermic needle mounted on a distal end thereof, said hypodermic needle including a distal tip portion; a sleeve dimensioned to fit over said barrel, and mounted to be slidable there along, said sleeve being axially between an extended position wherein said sleeve projects from said distal end of said barrel beyond the tip portion of said needle and a retracted position wherein said sleeve exposes the tip portion of said needle for use; locking means for securely locking said sleeve in said extended position; securing means comprising a screw-thread formed on said sleeve near a distal end thereof and engageable with a mating screw-thread formed on said barrel near said distal end of said barrel when said sleeve is in the retracted position to releasably secure said sleeve against axial movement. - View Dependent Claims (18, 19, 20)
-
-
21. A syringe comprising:
-
a barrel having an hypodermic needle mounted on one end thereof said needle that projects from an opposite end of said barrel;
wherein said barrel is tubular;a tubular sleeve dimensioned to fit over the barrel, and mounted to slide axially thereon between an extended position wherein at least a portion of said tubular sleeve projects from said one end of the barrel beyond the tip portion of said needle and a retracted position wherein said tubular sleeve coaxially surrounds said barrel and exposes said needle for use, said sleeve including an internal projection; locking means for securely locking said sleeve in said extended position in which said needle is fully covered to prevent injury to a user by said needle, said locking means comprising walls on said barrel that define a locking recess in said barrel into which locking recess said internal projection can be positioned by predetermined movement of said sleeve relative to said barrel in said extended position, said barrel including an inclined ramp adjacent one of said walls of said locking means to guide and facilitate entry of said projection into said locking recess by said predetermined movement of said sleeve relative to said barrel in said extended position; and
retaining means to releasably secure said sleeve when in the retracted position against axial movement relative to said barrel.
-
Specification