Lancet with locking cover

• US 5,324,302 A
• Filed: 10/13/1992
• Issued: 06/28/1994
• Est. Priority Date: 10/13/1992
• Status: Expired due to Term

• Current Assignee: Sherwood Services AG
• Original Assignee: Sherwood Medical Company (Medtronic Plc)
• Inventors: Crouse, Roger L.
• Primary Examiner(s): Yasko, John D.
• Assistant Examiner(s): GRING, NOELLE K
• Application Number:
  US07/960,074
• Time in Patent Office: 623 Days
• Field of Search: 604/115, 604/117, 604/158, 604/162, 604/171, 606/167, 606/172, 606/181, 606/182, 606/183, 606/184, 606/185
• US Class Current: 606/181
• CPC Class Codes: A61B 5/150022 for capillary blood or interstitial fluid
• CPC Class Codes: A61B 5/150259 Improved gripping, e.g. with high friction pattern or projections on the housing surface or an ergonometric shape
• CPC Class Codes: A61B 5/150435 Specific design of proximal end
• CPC Class Codes: A61B 5/150549 Protectors removed by rotational movement, e.g. torsion or screwing
• CPC Class Codes: A61B 5/150916 by blocking components, e.g. piston, driving device or fluid passageway
• CPC Class Codes: A61B 5/15105 Purely manual piercing, i.e. the user pierces the skin without the assistance of any driving means or driving devices
• CPC Class Codes: A61B 5/15142 Devices intended for single use, i.e. disposable

Abstract

A blood lancet is disclosed having a lancet needle with a sharpened lancet tip. The lancet tip is covered before use. The lancet tip end of the lancet needle extends through a slidable proximal needle piece while the opposite end of the lancet needle is immovably embedded in a distal needle piece. The distal needle piece is connected to the proximal needle piece through a pair of opposed normally bowed flexible arms. After pricking the user'"'"'s skin with the lancet tip, the bowed flexible arms are pinched towards each other which pushes the proximal needle piece into a position over and enclosing the lancet tip. The flexible arms each have an arrow shaped protrusion or catch that engages a correspondingly shaped receptacle on the distal needle piece to lock the proximal needle piece in position over the lancet tip. In one embodiment, a removable cap covers the lancet tip. In another embodiment, the proximal needle piece is formed around the lancet tip. In this embodiment, the lancet is pinched along the length of the lancet needle thereby pushing the lancet tip through the proximal needle piece into the user'"'"'s finger.

Claims

1. A lancet device comprising:

a) a lancet needle having a distal and a proximal end, said proximal end of said lancet needle having a sharpened tip;

b) a distal needle piece encasing said distal end of said lancet needle;

c) a proximal needle piece enclosing a portion of said lancet needle at said proximal end of said lancet needle, said proximal needle piece enclosing said lancet needle along less of said lancet needle than said distal needle piece encases said lancet needle;

d) a pair of opposed bowed flexible arms connecting said distal needle piece to said proximal needle piece along opposite sides of said lancet needle, said arms having a rigidity so that as said arms are moved towards each other pressure is exerted by said arms on said distal needle piece and said proximal needle piece to move said proximal needle piece away from said distal needle piece along said lancet needle to a position to cover and enclose said lancet tip;

e) means for locking said proximal needle piece in a position covering and enclosing said lancet tip, said means for locking including said arms having at least one means for contacting said distal needle piece when said arms are moved toward said distal needle piece and said distal needle piece having means for retaining said means for contacting to lock said corresponding arms in contact with said distal needle piece thereby locking said proximal needle piece in position over said lancet tip, said means for contacting comprising a protrusion extending from said arms towards said lancet needle and said means for retaining including said distal needle piece having a deformable recess in corresponding shape to said protrusion so that said protrusion is moved into said recess as said arms are moved toward said lancet needle and said recess deforms around said protrusion to retain said protrusion therein;

f) a proximal finger pad attached to the proximal end of said proximal needle piece and a distal finger pad attached to said distal end of said distal needle piece;

g) a pair of finger pads attached to the outer surface of said arms opposite said lancet needle to allow said arms to be grasped and pinched between fingers of a user'"'"'s hand towards said lancet needle.

17. The lancet device of claim 1 further comprising a pair of finger pads attached to the outer surface of said means for connecting opposite said lancet needle to allow said means for connecting to be grasped and pinched between fingers of a user'"'"'s hand towards said lancet needle.

18. The lancet device of claim 1 further comprising means for allowing said means for enclosing to easily move along said lancet needle as said means for connecting are moved toward each other.

19. The lancet device of claim 18 wherein said means for allowing comprises said lancet needle having a coating of a lubricous material along the length of said lancet needle that said means for enclosing traverses.

20. The lancet device of claim 18 wherein said means for allowing comprises said means for enclosing having a bore through which said lancet needle extends, said bore having a larger diameter than the diameter of said lancet needle.

2. A lancet device comprising:

a) a lancet needle having a distal and a proximal end, said proximal end of said lancet needle having a sharpened tip;

b) means for enclosing a portion of said lancet needle at said proximal end of said lancet needle; and

c) at least a pair of arms, each arm attached at one end to said distal end of said lancet needle and attached at an opposed end to said means for enclosing, said arms having a center section between said distal end of said lancet needle and said means for enclosing, said arms having a bowed shape in a relaxed condition so that said center section is relatively farther away from said lancet needle than the portions of said arms attached to said distal end of said lancet needle and attached to said means for enclosing, said arms, in said relaxed condition, having a length to cause said sharpened tip to extend proximally beyond the proximal end of said means for enclosing; and

,

d) means, located at said center section, for receiving force directed toward said lancet needle;

whereby, as force is applied to said means for receiving force directed toward said lancet needle, said arms approach a straight shape as said center section is moved toward said lancet needle thereby exerting pressure by said arms on said means for enclosing to move said means for enclosing away from said distal end of said lancet needle to a position to cover and enclose said lancet tip.

3. The lancet device of claim 2 wherein said arms are attached to said distal end of said lancet needle by a distal needle piece.

4. The lancet device of claim 2 wherein said means for enclosing comprises a proximal needle piece.

5. The lancet device of claim 2 wherein the number of said arms is two and said arms are opposed across the lancet needle.

6. The lancet device of claim 2 wherein:

said arms are attached to said distal end of said lancet needle by a distal needle piece; and

,

said means for enclosing comprises a proximal needle piece.

7. The lancet device of claim 6 wherein said distal needle piece encloses a portion of said distal end of said lancet needle.

8. The lancet device of claim 7 wherein said proximal needle piece encloses said lancet needle along less of said lancet needle than said distal needle piece encloses said lancet needle.

9. The lancet device of claim 2 further comprising means for locking said means for enclosing in a position covering and enclosing said lancet tip.

10. The lancet device of claim 9 wherein said means for locking includes said means for connecting having at least one means for contacting said means for positioning when said means for connecting are moved toward said means for positioning and said means for positioning having means for retaining said means for contacting to lock said corresponding means for connecting in contact with said means for positioning thereby locking said means for enclosing in position over said lancet tip.

11. The lancet device of claim 10 wherein said means for contacting comprises a protrusion extending from said means for connecting towards said lancet needle and wherein said means for retaining includes said means for positioning having a defomable recess in corresponding shape to said protrusion so that said protrusion is moved into said recess as said means for connecting are moved toward said lancet needle and said recess defoms around said protrusion to retain said protrusion therein.

12. The lancet device of claim 9 wherein said means for locking includes said means for positioning having at least one means for contacting said means for connecting when said means for connecting are moved toward said means for positioning and said means for connecting having means for retaining said means for contacting to lock said corresponding means for positioning in contact with said means for connecting thereby locking said means for enclosing in position over said lancet tip.

13. The lancet device of claim 12 wherein said means for contacting comprises a protrusion extending from said means for positioning away from said lancet needle and wherein said means for retaining includes said means for connecting having a deformable recess in corresponding shape to said protrusion so that said protrusion is moved into said recess as said means for connecting are moved toward said lancet needle and said recess deforms around said protrusion to retain said protrusion therein.

14. The lancet device of claim 2 further comprising a removable cap encasing and enclosing said lancet tip.

15. The lancet device of claim 14 wherein said cap is integrally attached to said means for enclosing.

16. The lancet device of claim 15 wherein said cap is integrally attached to said means for enclosing by a frangible connection so that twisting said cap relative to said means for enclosing causes said cap to become separated from said means for enclosing.

33. The device of claim 2 wherein the axis of said arms is aligned parallel with the axis of said lancet needle.

34. The device of claim 2 wherein said arms are spaced around the axis of said lancet.

35. The device of claim 2 wherein said arms are resilient.

36. The device of claim 2 wherein said arms are one piece.

21. A lancet device comprising:

a) a lancet needle having a distal and a proximal end, said proximal end of said lancet needle having a sharpened tip;

b) a distal needle piece enclosing said distal end of said lancet needle;

c) a proximal needle piece enclosing a portion of said lancet needle at said proximal end of said lancet needle; and

d) a pair of opposed normally bowed flexible arms connecting said distal needle piece to said proximal needle piece along opposite sides of said lancet needle, said arms having a center section between said distal needle piece and said proximal needle piece, said center section being relatively farther away from said lancet needle than the portions of said arms attached to said distal needle piece and attached to said proximal needle piece, said arms having a length, when bowed, to cause said sharpened tip to extend proximally beyond the proximal end of said means for enclosing, said arms having means, located at said center section, for receiving force directed toward said lancet needle, said arms having a rigidity so that as said arms are moved towards each other pressure is exerted by said arms on said distal needle piece and said proximal needle piece to move said proximal needle piece away from said distal needle piece along said lancet needle to a position to cover and enclose said lancet tip.

22. The lancet device of claim 21 wherein said proximal needle piece encloses said lancet needle along less of said lancet needle than said distal needle piece encloses said lancet needle.

23. The lancet device of claim 21 further comprising means for locking said proximal needle piece in a position covering and enclosing said lancet tip.

24. The lancet device of claim 23 wherein said means for locking includes said arms having at least one means for contacting said distal needle piece when said arms are moved toward said distal needle piece and said distal needle piece having means for retaining said means for contacting to lock said corresponding arms in contact with said distal needle piece thereby locking said proximal needle piece in position over said lancet tip.

25. The lancet device of claim 24 wherein said means for contacting comprises a protrusion extending from said arms towards said lancet needle and wherein said means for retaining includes said distal needle piece having a deformable recess in corresponding shape to said protrusion so that said protrusion is moved into said recess as said arms are moved toward said lancet needle and said recess deforms around said protrusion to retain said protrusion therein.

26. The lancet device of claim 23 wherein said means for locking includes said distal needle piece having at least one means for contacting said arms when said arms are moved toward said distal needle piece and said arms having means for retaining said means for contacting to lock said corresponding distal needle piece in contact with said arms thereby locking said proximal needle piece in position over said lancet tip.

27. The lancet device of claim 26 wherein said means for contacting comprises a protrusion extending from said distal needle piece away from said lancet needle and wherein said means for retaining includes said arms having a deformable recess in corresponding shape to said protrusion so that said protrusion is moved into said recess as said arms are moved toward said lancet needle and said recess deforms around said protrusion to retain said protrusion therein.

28. The lancet device of claim 21 further comprising a proximal finger pad attached to the proximal end of said proximal needle piece and a distal finger pad attached to said distal end of said distal needle piece.

29. The lancet device of claim 21 further comprising a removable cap encasing and enclosing said lancet tip.

30. The lancet device of claim 29 wherein said cap is integrally attached to said proximal needle piece.

31. The lancet device of claim 30 wherein said cap is integrally attached to said proximal needle piece by a frangible connection so that twisting said cap relative to said proximal needle piece causes said cap to become separated from said proximal needle piece.

32. The lancet device of claim 21 wherein said means for receiving force comprise a pair of finger pads attached to the outer surface of said arms at said center section opposite said lancet needle to allow said arms to be grasped and pinched between fingers of a user'"'"'s hand towards said lancet needle.

37. A lancet device comprising:

a) a lancet needle having a distal and a proximal end, said proximal end of said lancet needle having a sharpened tip;

b) means for enclosing a portion of said lancet needle at said proximal end of said lancet needle;

c) at least a pair of arms attached at one end to said distal end of said lancet needle and attached at an opposed end to said means for enclosing, said arms having a center section between said distal end of said lancet needle and said means for enclosing, said arms having a bowed shape in a relaxed condition so that said center section is relatively farther away from said lancet needle than the portions of said arms attached to said distal end of said lancet needle and attached to said means for enclosing, said arms, in said relaxed condition, having a length to cause said sharpened tip to be surrounded by said means for enclosing;

d) means, located at said center section, for receiving force applied to said center section directed toward said lancet needle; and

,

e) a proximal finger pad attached to the proximal end of said means for enclosing and a distal finger pad attached to said distal end of said means for positioning;

whereby, as a user places a finger or thumb on said proximal finger pad and a finger or thumb on said distal finger pad and pinches the device, said arms deform into a more bowed configuration than is present when the device is not pinched and said sharpened tip extends through said means for enclosing into contact with the user'"'"'s thumb or finger, thereby producing a drop of blood, and

whereby, as force is applied to said means for receiving force directed toward said lancet needle, said arms approach a straight shape as said center section is moved toward said lancet needle thereby extering pressure by said arms on said means for enclosing to move said means for enclosing away from said distal end of said lancet needle to a position to cover and enclose said lancet tip.

38. A lancet device comprising:

a) a lancet needle having a distal and a proximal end, said proximal end of said lancet needle having a sharpened tip;

b) means for enclosing a portion of said lancet needle at said proximal end of said lancet needle; and

c) at least a pair of one-piece arms attached at one end to said distal end of said lancet needle and attached at an opposed end to said means for enclosing, said arms being resilient over their entire length, said arms having a center section between said distal end of said lancet needle and said means for enclosing, said arms having a bowed shape in a relaxed condition so that said center section is relatively farther away from said lancet needle than the portions of said arms attached to said distal end of said lancet needle and attached to said means for enclosing, said arms, in said relaxed condition, having a length to cause said sharpened tip to extend proximally beyond the proximal end of said means for enclosing;

whereby said arms approach a straight shape as said center section is moved toward said lancet needle thereby exerting pressure by said arms on said means for enclosing to move said means for enclosing away from said distal end of said lancet needle to a position to cover and enclose said lancet tip.

39. In a lancet device having a lancet needle with a distal end and a sharpened proximal tip, a method for enclosing the sharpened proximal tip comprising the steps of:

a) enclosing a portion of the lancet needle at the proximal end of the lancet needle in a proximal needle piece; and

b) attaching a pair of arms to the distal end of the lancet needle and to said proximal needle piece, each of said arms having a center section between the distal end of the lancet needle and said proximal needle piece, each of said arms having a bowed shape in a relaxed condition so that said center section of each of said arms is relatively farther away from the lancet needle than the portions of said arms attached to the distal end of the lancet needle and attached to the proximal needle piece, said arms, in said relaxed condition, having a length to cause the sharpened tip to extend proximally beyond the proximal end of said proximal needle piece; and

,

c) applying a force to said center sections to move said center sections toward the lancet needle, whereby said arms approach a straight configuration as said center sections are moved toward the lancet needle thereby exerting pressure by said arms on said proximal needle piece to move said proximal needle piece away from the distal end of the lancet needle to a position to cover and enclose the lancet proximal tip.