Syringe with retractable needle assembly
First Claim
1. A syringe comprising a hollow body including a substantially closed end that defines an aperture, a substantially open end and an internal shoulder;
- a needle assembly in the hollow body including a needle extendable through the aperture;
a plunger assembly movable in the hollow body including an elongate portion extending through the substantially open end from the hollow body, a sealing platform at one end of the elongate portion within the hollow body and a retraction member releasably secured to the sealing platform and engageable with the needle assembly;
a catch member engageable with the internal shoulder and selectively engageable with the plunger assembly while engaged with the shoulder;
an elastic member extending between the retraction member and the catch member.
7 Assignments
0 Petitions
Accused Products
Abstract
A disposable, single use syringe comprised of a hollow body, a retractable needle assembly positioned in the hollow body, and a plunger assembly in the hollow body. The plunger assembly includes an elongated frame portion including at least one guide track between its ends. A retraction member is releasably secured to one end of the frame and a catch member, including a catch element, is positioned with a guide configured to travel in the plunger frame guide track. An elastic member extends between the retraction member and the catch member. A retention assembly depends from the opposite end of the plunger frame and is configured to receive and secure the catch element and thereby tension the elastic member. The needle assembly and the retraction member have complimentary mating members, whereby the tension on the elastic member is released and the injection means is drawn into the hollow body after the needle assembly and the retraction member mate. A method of manufacture is also provided.
37 Citations
54 Claims
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1. A syringe comprising
a hollow body including a substantially closed end that defines an aperture, a substantially open end and an internal shoulder; -
a needle assembly in the hollow body including a needle extendable through the aperture;
a plunger assembly movable in the hollow body including an elongate portion extending through the substantially open end from the hollow body, a sealing platform at one end of the elongate portion within the hollow body and a retraction member releasably secured to the sealing platform and engageable with the needle assembly;
a catch member engageable with the internal shoulder and selectively engageable with the plunger assembly while engaged with the shoulder;
an elastic member extending between the retraction member and the catch member. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A syringe comprising
a hollow body including a substantially closed end that defines an aperture and a substantially open end; -
a needle assembly in the hollow body including a needle extendable through the aperture;
a plunger assembly movable in the hollow body including an elongate portion extending through the substantially open end from the hollow body, a sealing platform at one end of the elongate portion within the hollow body and a retraction member releasably secured to the sealing platform and engageable with the needle assembly, the sealing platform having a hollow shaft, the retraction member being in sealing engagement with the hollow shaft prior to retraction, the retraction member having a circumferential groove about the outer periphery and an O-ring seal in the groove, the hollow shaft having a seat receiving the seal;
an elastic member engaged with the retraction member. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A syringe comprising
a hollow body including a substantially closed end that defines an aperture, a substantially open end and at least one ramp member proximate the substantially closed end; -
a needle assembly in the hollow body including a needle extendable through the aperture;
a plunger assembly movable in the hollow body including an elongate portion extending through the substantially open end from the hollow body, a sealing platform at one end of the elongate portion within the hollow body and a retraction member releasably secured to the sealing platform and engageable with the needle assembly, the sealing platform having a first annular seal distant the elongate portion and a second annular seal proximate the elongate portion spaced apart by a recessed area, each annular seal sealingly engaging the hollow body, the at least one ramp member engageable with the first annular seal with the plunger assembly proximate the substantially closed end of the hollow body breaking the sealing engagement of the first annular seal with the hollow body;
an elastic member engaged with the retraction member. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42)
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43. A syringe comprising
a hollow body including a substantially closed end that defines an aperture, and a substantially open end; -
a needle assembly in the hollow body including a needle extendable through the aperture;
a plunger assembly movable in the hollow body including an elongate portion extending through the substantially open end from the hollow body, a sealing platform at one end of the elongate portion within the hollow body and a retraction member releasably secured to the sealing platform and engageable with the needle assembly, the elongate portion including a thumb pad, the thumb pad being in sealing engagement with the hollow body with the sealing platform against the substantially closed end of the hollow body;
an elastic member engaged with the retraction member.
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44. A syringe comprising
a hollow body including a substantially closed end that defines an aperture, a substantially open end and an internal shoulder; -
a needle assembly in the hollow body including a needle extendable through the aperture;
a plunger assembly movable in the hollow body including an elongate portion extending through the substantially open end from the hollow body, a sealing platform at one end of the elongate portion within the hollow body and a retraction member releasably secured to the sealing platform and engageable with the needle assembly;
a catch member engageable with the internal shoulder and selectively engageable with the plunger assembly while engaged with the shoulder, the elongate portion defining at least one longitudinally extending guide track, the catch being slideably retained in the longitudinally extending guide track, the plunger assembly further including a retention assembly distant the sealing platform configured to engage the catch member to restrain the catch member against movement in the guide track, the retention assembly having at least one hook, the catch member including a barbed tip engageable with the at least one hook;
an elastic member extending between the retraction member and the catch member.
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45. The syringe of claim 45, the retention assembly further having a plurality of hooks defining a socket for receipt and retention of the barbed tip.
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46. A syringe comprising
a hollow body including a substantially closed end that defines an aperture, a substantially open end and an internal shoulder; -
a needle assembly in the hollow body including a needle extendable through the aperture;
a plunger assembly movable in the hollow body including an elongate portion extending through the substantially open end from the hollow body, a sealing platform at one end of the elongate portion within the hollow body, a retention assembly distant the sealing platform and having at least one retention tooth and a retraction member releasably secured to the sealing platform and engageable with the needle assembly, the elongate portion defining at least one longitudinally extending guide track;
a catch member engageable with the internal shoulder and selectively engageable with the plunger assembly while engaged with the shoulder, the catch being slideably retained in the longitudinally extending guide track, the retention assembly configured to engage the catch member to restrain the catch member against movement in the guide track the catch member including a least one catch tooth engageable with the at least one retention tooth;
an elastic member extending between the retraction member and the catch member. - View Dependent Claims (47)
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48. A syringe comprising
a hollow body including a substantially closed end that defines an aperture, a substantially open end and an internal shoulder; -
a needle assembly in the hollow body including a needle extendable through the aperture;
a plunger assembly movable in the hollow body including an elongate portion extending through the substantially open end from the hollow body, a sealing platform at one end of the elongate portion within the hollow body and a retraction member releasably secured to the sealing platform and engageable with the needle assembly and having a retraction member anchor extending from one end;
a catch member engageable with the internal shoulder and selectively engageable with the plunger assembly while engaged with the shoulder and having a catch member anchor;
an elastic member extending between the retraction member and the catch member and being a cord molded about the retraction member anchor at the first end and about the catch member anchor at the second end. - View Dependent Claims (49, 50, 51, 52, 53, 54)
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Specification