Disposable lancet

• US 6,322,574 B1
• Filed: 11/01/1999
• Issued: 11/27/2001
• Est. Priority Date: 10/29/1999
• Status: Expired due to Fees

• Current Assignee: Medical Plastic Devices MPD Incorporated
• Original Assignee: Medical Plastic Devices MPD Incorporated
• Inventors: Lancing, Martin, Lloyd, William A.
• Primary Examiner(s): Thaler, Michael H.
• Application Number:
  US09/431,189
• Time in Patent Office: 757 Days
• Field of Search: 606/181, 606/182, 606/183, 600/583
• 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 5/150549 Protectors removed by rotational movement, e.g. torsion or screwing
• CPC Class Codes: A61B 5/150618 Integrally moulded protectors, e.g. protectors simultaneously moulded together with a further component, e.g. a hub, of the piercing element
• 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 5/1513 comprising linear sliding guides comprising tooth-shaped elements A61B5/15132
• CPC Class Codes: A61B 5/15142 Devices intended for single use, i.e. disposable

Abstract

A disposable lancet for puncturing skin is disclosed herein. The lancet comprises a T-shaped housing, a reciprocally movable elongated body that embeds a puncturing needle and a leaf spring to bias the elongated body towards a safe neutral position, where the puncturing device is retracted in the housing. The elongated body is generally cross-shaped and is guided by projections in the housing that define a cross-shaped passage. The leaf spring is located in the handle portion of the T-shaped housing and cooperates with the elongated body via a slit provided in the elongated body. The lancet is operated by pressing a portion of the elongated body that extends from the handle portion of the housing at one end. The lancet is then in a puncturing position, where the puncturing needle extends out of the housing at the distal end thereof. The elongated body returns to the safe neutral position when the force applied to the elongated body is no longer sufficient to overcome the biasing action of the leaf spring.

Claims

1. A lancet for puncturing skin, said lancet comprising:

a housing defining a passage having a proximal end and a distal end;

said housing including a recess;

an elongated body having a proximal end and a distal end;

said elongated body being so mounted in said passage as to reciprocate between a safe neutral position and a puncturing position and as to prevent its removal therefrom;

a puncturing device provided at said distal end of said elongated body;

said puncturing device extending from said distal end of said passage when said elongated body is in said puncturing position; and

a leaf spring received in said recess and being so removably mounted to said elongated body as to bias said elongated body towards said safe neutral position;

wherein said elongated body is moved from said safe neutral position to said puncturing position when a force is so applied thereto as to overcome the biasing action of said leaf spring.

2. A lancet as recited in claim 1, wherein said housing includes two identical half-shells.

3. A lancet as recited in claim 1, wherein said housing includes a handle portion.

4. A lancet as recited in claim 3, wherein said housing is generally T-shaped.

5. A lancet as recited in claim 1, wherein the exterior surface of said housing includes friction generating surfaces.

6. A lancet as recited in claim 1, wherein said housing includes an end wall to limit the movement of said elongated body in said passage.

7. A lancet as recited in claim 1, wherein said housing includes an elongated portion having a proximate end and a distal end and defining a passage therein.

8. A lancet as recited in claim 7, wherein said distal end of said elongated portion includes an external contacting surface to contour a body part.

9. A lancet as recited in claim 1, wherein a) said elongated body has a generally cross-shaped cross-section, and b) said passage includes a corresponding cross-shaped portion to guide said elongated body.

10. A lancet as recited in claim 1, wherein said elongated body includes at least one fin to guide said elongated body in said passage.

11. A lancet as recited in claim 1, wherein said elongated body includes a transversal notch configured and sized to receive a portion of said leaf spring.

12. A lancet as recited in claim 1, wherein said recess includes two opposite angled walls.

13. A lancet as recited in claim 1, wherein said recess includes opposite V-shaped notches configured and sized to receive opposite ends of the leaf spring.

14. A lancet as recited in claim 1, wherein said puncturing device is a needle.

15. A lancet as recited in claim 14, wherein said needle includes a bevelled point.

16. A lancet as recited in claim 14, wherein said needle includes a tri-bevelled point.

17. A lancet as recited in claim 1, wherein said puncturing device is embedded in said elongated body.

18. A lancet as recited in claim 1, further comprising a removable cap to cover the puncturing device.

19. A lancet as recited in claim 18, wherein said removable cap is integrally mounted to said distal end of said elongated body.

20. A lancet for puncturing skin, said lancet comprising:

a housing defining a passage having a proximal end and a distal end;

said housing including a recess;

an elongated body having a proximal end and a distal end;

said elongated body being so mounted in said passage as to reciprocate between a safe neutral position and a puncturing position and as to prevent its removal therefrom;

a puncturing device provided at said distal end of said elongated body;

said puncturing device extending from said distal end of said passage when said elongated body is in said puncturing position; and

a single leaf spring completely received in said recess and being so mounted to said elongated body as to bias said elongated body towards said safe neutral position and as to force with a snap action said elongated body towards said puncturing position when a predetermined force is applied as to overcome the biasing action of said leaf spring.