Protective sleeve for hypodermic needle

• US 4,966,592 A
• Filed: 05/05/1989
• Issued: 10/30/1990
• Est. Priority Date: 05/05/1989
• Status: Expired due to Fees

• Current Assignee: Cameron A. Burns, Terry A. Burns
• Original Assignee: Cameron A. Burns, Terry A. Burns
• Inventors: Burns, Cameron A., Burns, Terry A.
• Primary Examiner(s): Pellegrino, Stephen C.
• Application Number:
  US07/347,588
• Time in Patent Office: 543 Days
• Field of Search: 604/198, 604/197, 604/263, 604/192
• US Class Current: 604/198
• CPC Class Codes: A61M 5/3257 Semi-automatic sleeve extension, i.e. in which triggering of the sleeve extension requires a deliberate action by the user, e.g. manual release of spring-biased extension means
• CPC Class Codes: A61M 5/3271 with guiding tracks for controlled sliding of needle protective sleeve from needle exposing to needle covering position
• CPC Class Codes: A61M 5/3272 having projections following labyrinth paths

Abstract

A hypodermic syringe barrel is provided with an external rotatable and slidable protective sleeve extendable and retractable relative to a needle mounted from the barrel and the sleeve is lightly biased toward the extended position thereof with the needle fully enclosed within the sleeve. The sleeve and barrel are operatively interconnected through utilization of a pin and slot connection defining limits of extension and retraction of the sleeve and the pin and slot connection includes structure whereby angular displacement of the sleeve relative to the barrel may be effected at each limit position of the sleeve for retaining the sleeve in that limit position.

Claims

1. An elongated syringe barrel component including needle mounting means at one end and a needle mounted from said needle mounting means and projecting endwise outwardly of said one end, a protective sleeve component having first and second ends, said sleeve component being slidingly telescoped over said one end of said barrel component and rotatable relative thereto with a first end of said sleeve component shiftable between extended and retracted limit positions relative to said one end, said sleeve component, when in said retracted position, projecting a predetermined extend outwardly of said one nd inwardly of the outer extremity of said needle and when in said extended position extending outward of said outer extremity, biasing means operatively connected between said barrel and sleeve components lightly yieldingly biasing said sleeve component toward said extended position, said barrel and sleeve component including coacting pin and slot connection means establishing said limit positions and effecting rotational oscillation between said barrel and sleeve components as said sleeve component completes and initiates its movement toward and away from, respectively, said retracted position, said pin and slot connection means including a longitudinal control slot formed in one of said components and a pin carried by the other component slidingly and guidingly received in said control slot, said control slot including first and second closed end portions defining said extended and retracted limit positions, respectively, said first end portion extending laterally in one direction partially about said one component and said second end portion incorporating a lateral slot segment extending partially about said one component in which said pin may be received from said control slot second end portion and retained against the biasing action of said biasing means, said first end portion, including a slot segment extending a short distance longitudinally of said one component toward said other slot end portion and in which said pin is receivable, said one component also including an entrance slot formed therein including one end opening into said control slot intermediate the closed ends of said control slot end portions and a second end opening endwise outwardly of said one component adjacent the end thereof remote from said lateral slot segment.

2. The syringe barrel and sleeve components of claim 1 wherein said slot segment extending longitudinally of said one component includes reduced width zone thereof adjacent the terminus of said laterally extending first end portion through which said pin is snap receivable.

3. The barrel and sleeve components of claim 1 wherein said one component comprises said sleeve component.

4. The syringe barrel and sleeve components of claim 1 wherein said first end of said sleeve component includes an annular partial end wall, said biasing means comprising a coiled compression spring interposed between the inner surface of said annular partial end wall and said one end of said barrel and through which said needle is loosely received.

5. The barrel and sleeve components of claim 1 wherein said one component comprises said sleeve component, said one end of said barrel component including a reduced diameter endwise outwardly projecting sleeve in which the hub end of said needle is secured, said pin being carried by an accessory sleeve telescoped over and tightly fitted upon said reduced diameter sleeve.

6. The syringe and sleeve components of claim 5 wherein said first end of said sleeve component includes an annular partial end wall, said biasing means comprising a coiled compression spring interposed between the inner surface of said annular partial end wall and said one end of said barrel and through which said needle is loosely received.

7. The barrel and sleeve components of claim 6 wherein said one component comprises said sleeve component.

8. The barrel and sleeve components of claim 7 wherein said slot segment extending longitudinally of said one component includes a reduced width zone thereof adjacent the terminus of said laterally extending first end portion through which said pin is snap receivable.

9. An elongated syringe barrel component including needle mounting means at one end and a needle mounted from said needle mounting means and projecting endwise outwardly of said one end, a protective sleeve component having first and second ends, said sleeve component being slidingly telescoped over said one end of said barrel component and rotatable relative thereto with a first end of said sleeve component shiftable between extended and retracted limit position relative to said one end, said sleeve component, when in said one retracted position, projecting a predetermined extent outward of said end inward of the outer extremity of said needle and when in said extended position extending outward of said outer extremity, said barrel and sleeve components including coacting pin and slot connection means establishing said limit positions, said pin and slot connection means including a longitudinal control slot formed in said sleeve and a pin carried by said barrel component, said one end of said barrel component including a reduced diameter sleeve projecting endwise outwardly thereof within which the hub of said needle is mounted, an accessory sleeve snugly and frictionally removably telescoped over and retained on said reduced diameter sleeve, said pin being carried by said accessory sleeve.

10. The barrel and sleeve components of claim 9 including biasing means operatively connected between said barrel and sleeve components lightly yieldingly biasing said sleeve component toward said extended position.

11. The barrel and sleeve components of claim 10 wherein said first end of said sleeve component includes an annular partial end wall, said biasing means comprising a coiled compression spring interposed between the inner surface of said annular partial end wall and said one end of said barrel and through which said needle is loosely received.

12. An elongated syringe barrel component including needle mounting means at one end and a needle mounted from said needle mounting means and projecting endwise outwardly of said one end, a protective sleeve component having first end second ends, said sleeve component being slidingly telescoped over said one end of said barrel component and rotatable relative thereto with a first end of said sleeve component shiftable between extended and retracted limit positions relative to said one end, said sleeve component, when in said retracted position, projecting a predetermined extent outwardly of said one end inwardly of the outer extremity of said needle and when in said extended position extending outward of said outer extremity, biasing means operatively connected between said barrel and sleeve components lightly yieldingly biasing said sleeve component toward said extended position, said barrel and sleeve component including connection means establishing said limit positions and effecting rotational oscillation between said barrel and sleeve components as said sleeve component completes and initiates its movement toward and away from, respectively, said retracted position, said connection means also including means preventing movement of said sleeve from said extended position toward said retracted position, upon opposite directional forces being applied longitudinally to said sleeve an barrel components sufficient to overcome the biasing action of said biasing means, independent of also applying opposing rotational forces to said components to effect reverse relative rotational displacement therebetween.