Integration of a lancette with its capturing and removing cap

• US 7,153,318 B2
• Filed: 12/07/2000
• Issued: 12/26/2006
• Est. Priority Date: 12/08/1999
• Status: Expired due to Fees

• Current Assignee: Owen Mumford
• Original Assignee: Owen Mumford
• Inventors: Marshall, Jeremy, Crossman, David Danvers
• Primary Examiner(s): Woo, Julian W.
• Assistant Examiner(s): WEBB, SARAH K
• Application Number:
  US10/089,834
• Publication Number:
  US 20020151920A1
• Time in Patent Office: 2,210 Days
• Field of Search: 606181-183
• US Class Current: 606/181
• CPC Class Codes: A61B 5/150022 for capillary blood or interstitial fluid
• CPC Class Codes: A61B 5/150412 Pointed piercing elements, e.g. needles, lancets for piercing the skin blade-like piercing elements A61B5/150442
• CPC Class Codes: A61B 5/150519 Details of construction of hub, i.e. element used to attach the single-ended needle to a piercing device or sampling device
• CPC Class Codes: A61B 5/150549 Protectors removed by rotational movement, e.g. torsion or screwing
• CPC Class Codes: A61B 5/15061 by material engagement, e.g. welding, bonding
• CPC Class Codes: A61B 5/150641 comprising means to impede repositioning of protection sleeve from covering to uncovering position
• CPC Class Codes: A61B 5/150717 manually removed
• CPC Class Codes: A61B 5/15113 Manually triggered, i.e. the triggering requires a deliberate action by the user such as pressing a drive button
• CPC Class Codes: A61B 5/15117 comprising biased elements, resilient elements or a spring, e.g. a helical spring, leaf spring, or elastic strap
• CPC Class Codes: A61B 5/1519 comprising driving means, e.g. a spring, for propelling the piercing unit

Abstract

A lancet body (2) is integrally molded with a cap (3) for a firing device, the cap concealing the needle tip (5). the cap (3) can be used to insert the lancet (1), which is held while the cap is twisted off. The cap (3) is then fitted to the firing device to provide an apertured platform to be held against the skin and through which the needle tip (5) will momentarily project. The cap (3) has to be deformed to fit, and on being removed and recovering its natural shape internal lugs (14) catch hold of the released lancet (1) and remove that as well.

Claims

1. A lancet, comprising:

a body;

a neck located at a first end of the body;

a cap connected to the body at the neck and integrally moulded with the body,

the cap being of a cup form with, at a front end, a base having a central aperture,

an exterior surface of the cap flaring outwardly from the base into an approximately elliptical cross-section at a break circumference,

the exterior surface extending beyond the break circumference, to a rear end of the cap, as a constant approximately elliptical cross-section portion,

two axially spaced ribs located on the body and defining a gap therebetween;

two inwardly-directed opposed lugs, limited in position to an internal part of the constant approximately elliptical cross-section portion, the two inwardly-directed opposed lugs located on an inner surface of the constant approximately elliptical cross-section portion on the minor axis thereof; and

a needle with a tip projecting into the neck, wherein,

the rear end of the cap connects to a cylindrical forward end of a firing device by squeezing the constant approximately elliptical cross-section portion along the major axis of the approximately elliptical cross-section to deform the approximately elliptical cross-section into a circular cross-section,

upon firing the lancet the needle tip momentarily projects through the aperture and then retracts so that the needle tip is within the cap and the opposed lugs are proximate the gap between the two ribs, and

upon removal of the firing device from the cap, the constant approximately elliptical cross-section portion resumes the approximately elliptical cross-section with the opposed lugs closing towards each other and engaging the gap between the two ribs to capture the ribs and to capture the body within the cap.

2. The lancet of claim 1, wherein,

two opposed longitudinal slots originate at the two opposed lugs and extend to the rim of the base.

3. The lancet of claim 1,

wherein, a first of the two ribs defines a first abutment, and a second of the two ribs defines a second abutment to the rear of the first abutment, the lugs being adapted to engage between the first and second abutments when the cap is removed from a firing device.

4. The lancet of claim 1, in combination with a firing device wherein the rear of the lancet body is non-rotatively receivable by a holder in the firing device.

9. The lancet of claim 1, wherein, the cap, removed from body, is configured to have the lugs co-operate with the ribs to lock the cap on the lancet.

11. The lancet of claim 1, wherein, manual removal of the cap automatically removes the lancet, the cooperation of the lugs and ribs performing a capture, an extraction, and a locking as the cap is pulled off the firing device.

14. The lancet of claim 1, wherein, a portion of the exterior surface of the cap extending to the rear of the cap being a continuous wall.

5. A lancet, comprising:

a body with a neck located at a first end;

a cap connected to the body at the neck,

the cap having a front end with a base having a central aperture,

an exterior surface of the cap flaring outwardly into an approximately elliptical cross-section at a break circumference,

the exterior surface extending beyond the break circumference, to a rear end of the cap, as a constant approximately elliptical cross-section portion, a portion of the exterior surface extending to the rear of the cap being a continuous wall;

a gap located between two axially spaced circular ribs of the body, the ribs extending beyond a cylindrical envelope of remaining portions of the body;

two opposed lugs extending inwardly from an internal part of the constant approximately elliptical cross-section portion, the two opposed lugs located on the minor axis of the constant approximately elliptical cross-section portion;

two opposed longitudinal slots originating at the two opposed lug and extending to the rim of the base; and

a needle with a tip projecting into the neck, wherein,

the rear end of the cap connects the cap to a cylindrical forward end of a firing device by squeezing the constant approximately elliptical cross-section portion along the major axis of the approximately elliptical cross-section to deform the approximately elliptical cross-section into a circular cross-section corresponding to the cylindrical forward end of the firing device,

upon firing the lancet the needle tip momentarily projects through the aperture and then retracts so that the needle tip is within the cap and the opposed lugs are proximate the gap between the two ribs, and

upon removal of the firing device from the cap, the constant approximately elliptical cross-section portion resumes the approximately elliptical cross-section with the opposed lugs closing towards each other and engaging the body at the gap between the ribs to capture the body within the cap.

6. The lancet of claim 5, wherein, the body has a cruciform cross section.

10. The lancet of claim 5, wherein, the cap, removed from body, is configured to have the lugs co-operate with the ribs to lock the cap on the lancet.

12. The lancet of claim 5, wherein, removal of the cap, by a manual pulling operation, automatically removes the lancet, the co-operation of the lugs and ribs performing a capture, an extraction, and a locking as the cap is pulled off the firing device.

7. A lancet, comprising:

a body holding a needle;

a cap connected to the body at a neck, the cap concealing a tip of the needle and being breakable away from the body at the neck to expose the tip,

the cap having a front end with a base having a needle aperture,

an exterior surface of the cap flaring outwardly from the base into an approximately elliptical cross-section at a break circumference,

the exterior surface extending beyond the break circumference, to a rear end of the cap, as a constant approximately elliptical cross-section portion;

a gap located between two axially spaced circular ribs of the body, the ribs extending beyond a cylindrical envelope of remaining portions of the body;

two opposed lugs extending inwardly from an internal part of the constant approximately elliptical cross-section portion; and

two opposed longitudinal slots originating at the two opposed lug and extending toward the rim of the base, and, wherein,

the rear end of the cap connects the cap to a cylindrical forward end of a firing device by squeezing the constant approximately elliptical cross-section portion along the major axis of the approximately elliptical cross-section to deform the approximately elliptical cross-section into a circular cross-section corresponding to the cylindrical forward end of the firing device,

upon firing the lancet the needle tip momentarily projects through the aperture and bounces back so that the needle tip is within the cap and the opposed lugs are proximate the gap between the two ribs, and

upon removal of the firing device from the cap, the constant approximately elliptical cross-section portion resumes the approximately elliptical cross-section with the opposed lugs closing towards each other and engaging the body at the gap between the ribs to capture the body within the cap,

the cap, removed from body, configured to have the lugs co-operate with the ribs to lock the cap on the lancet.

8. The lancet of claim 7, wherein, the body has a cruciform cross section.

13. The lancet of claim 7, wherein, removal of the cap automatically removes the lancet, the co-operation of the lugs and ribs performing a capture, an extraction, and a locking as the cap is pulled off the firing device.

15. The lancet of claim 7, wherein, a portion of the exterior surface of the cap extending to the rear of the cap being a continuous wall.