Hypodermic syringe with a locking needle assembly and syringe combination
First Claim
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1. A syringe comprising:
- a) a body portion with an inner surface defining a volume for holding a fluid;
b) a plunger conforming to the inner surface of said body portion so as to fit tightly and to form a seal separating the volume on either side of said plunger within said body portion;
c) a driver onto which said plunger is secured, said plunger being positioned within said body portion and said driver extending out of said body portion through an opening in said boy portion at one end;
d) a needle support means positioned at the end of said body portion opposite the end through which said driver extends, said needle support means defining a channel allowing the transfer of fluid within said boy portion to a needle or needle assembly mounted on said needle support;
e) syringe locking means located on the inner surface of said body portion; and
f) syringe engagement means adapted to matingly engage said syringe locking means, said engagement means being associated with said driver, separate from said plunger and advanceable towards said needle support, and over said locking means, and being retained at the needle support end of said body portion upon the engagement of said locking means, said engagement coinciding with fluid, initially present in the volume defined by said body portion, being substantially discharged, wherein said engagement means comprises adjacent first and second members, said first and second members being positioned such that said first member prevents said second member from flexing sufficiently to return over said syringe locking means after
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Abstract
A needle assembly and syringe combination that are permanently joined through a mechanical locking arrangement of a groove 32, catch space 34 and catch 36 is disclosed. The use of this locking arrangement on a non-reusable syringe renders the needle 20 unusable along wih the syringe after a single use.
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Citations
19 Claims
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1. A syringe comprising:
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a) a body portion with an inner surface defining a volume for holding a fluid; b) a plunger conforming to the inner surface of said body portion so as to fit tightly and to form a seal separating the volume on either side of said plunger within said body portion; c) a driver onto which said plunger is secured, said plunger being positioned within said body portion and said driver extending out of said body portion through an opening in said boy portion at one end; d) a needle support means positioned at the end of said body portion opposite the end through which said driver extends, said needle support means defining a channel allowing the transfer of fluid within said boy portion to a needle or needle assembly mounted on said needle support; e) syringe locking means located on the inner surface of said body portion; and f) syringe engagement means adapted to matingly engage said syringe locking means, said engagement means being associated with said driver, separate from said plunger and advanceable towards said needle support, and over said locking means, and being retained at the needle support end of said body portion upon the engagement of said locking means, said engagement coinciding with fluid, initially present in the volume defined by said body portion, being substantially discharged, wherein said engagement means comprises adjacent first and second members, said first and second members being positioned such that said first member prevents said second member from flexing sufficiently to return over said syringe locking means after - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A locking needle assembly and syringe comprising:
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a) a non-reusable syringe comprising a cylindrical needle support; b) a needle assembly comprising a cylindrical body configured, proportioned and dimensioned to matingly engage said needle support; c) a hypodermic needle permanently fixed to said needle assembly such that a hollow interior in said needle communicates with a hollow interior of said cylindrical body of said needle assembly; and d) a mechanical needle assembly locking means comprising complementary locking structures on said syringe and said needle assembly, wherein said complementary structures comprise; i) at least one groove communicating with at least one associated catch space; and i) at least one wedge-shaped catch. - View Dependent Claims (14, 15, 16, 17)
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18. A hypodermic syringe and needle assembly comprising:
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a) a tubular member, forming the body portion of said syringe, defining a volume and having a non-circular cross-section, said tubular member having an interior surface; b) a rubber-type plunger, in cross-section, the perimeter of which bears sealingly with the interior surface of said tubular member when inserted into and moved within said tubular member; c) a driver affixed to said plunger, said driver extending out of an open end of said tubular member housing said plunger, said plunger configured and dimensioned to contact said interior surface of said tubular member in a manner that prevents rotation of said plunger within said tubular member; d) needle support means positioned at the end of said tubular ember opposite the end through which the driver extends, said needle support means containing a channel through which fluid may be drawn into or expelled from the volume within said tubular member by movement of the driver and attached plunger within said tubular member; and e) syringe locking means comprising a plurality of ramp stops on said interior surface of said tubular member, said ramp stops being substantially flush with said interior surface and rising above said interior surface with the raised portion of said ramp stops being closer to the needle support means than a substantially flush end of said ramp stops; f) engagement means on said driver, separate from said plunger and advanceable towards said needle support means over said ramp stops, said engagement means being retained in the advanced position after passing over said ramp stops and preventing the withdrawal of said driver and plunger, wherein said engagement means comprises closely spaced first and second substantially planar members wherein the intervening space between said first and second substantially planar members is insufficient to allow said second planar member to flex sufficiently to return over said syringe locking means after having advanced over said locking means; g) a needle assembly comprising a cylindrical body configured and dimensioned to matingly engage said needle support means; h) a hypodermic needle permanently fixed to said needle assembly such that a hollow interior in said needle communicates with a hollow interior of said cylindrical body of said needle assembly; and i) a mechanical needle assembly locking means comprising complementary locking structures on said needle support means and said needle assembly, wherein said complementary structures comprise; i) at least one groove communicating with at least one associated catch space; and ii) at least one wedge-shaped catch. - View Dependent Claims (19)
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Specification