Single use device for blood microsampling
A lancing device including a spring-driven lancet translationally mounted within a housing. The lancet has at least one resilient finger extending outwardly therefrom and engageable within a cooperating recess formed in the housing to prevent re-use of the lancing device. A depth-adjustment knob is optionally included for contacting the housing to limit the travel of the lancet and thereby control the depth of penetration.
1. A single-use lancing device comprising:
a housing having a first end, a second end, and a chamber between said first and second ends, the first end of said housing defining a lancet opening, said housing further comprising at least one internal shoulder and a flange extending across at least a portion of the chamber;
a lancet translationally mounted within the chamber of said housing for movement between a cocked position and a lancing position, said lancet having a lancet tip for passage through the lancet opening of said housing in the lancing position, and at least one finger for engaging the internal shoulder of said housing after firing to prevent reuse;
a spring engaged between said lancet and the flange of said housing to drive said lancet from the cocked position toward the lancing position upon firing of the lancing device; and
a cocking arm connected to said lancet, said cocking arm comprising a pair of shafts, a first end of each shaft connected to opposed sides of said lancet, and a second end of each shaft connected to a cocking grip, each shaft comprising a fin extending outwardly therefrom for releasable engagement with the flange of said housing to constrain said lancet in the cocked position.
2. The single-use lancing device of claim 1 , wherein said cocking arm further comprises a depth-adjustment knob for contacting the flange of said housing to limit the travel of said lancet at the lancing position.
3. The single-use lancing device of claim 1 , further comprising a sterility cap detachably mounted over the lancet tip.
4. The single-use lancing device of claim 1 , wherein said housing comprises first and second half-shells hingedly joined to one another.
5. The single-use lancing device of claim 1 , wherein the at least one internal shoulder of said housing is formed by an opposed pair of recesses within said housing between the first end of said housing and the flange.
6. The single-use lancing device of claim 5 , wherein the at least one finger of said lancet comprises a pair of fingers extending outwardly and away from the lancet tip.
7. The single-use lancing device of claim 6 , wherein each of said fingers is generally curved.
8. The single-use lancing device of claim 1 , wherein said spring retracts the lancet to prevent the lancet tip from extending through the lancet opening of said housing after firing the lancing device.
9. A single-use lancing device comprising:
a housing having a first end, a second end, and a chamber between said first and second ends, the first end of said housing defining a lancet opening, said housing further comprising at least one internal shoulder and a flange extending across at least a portion of the chamber;
a lancet translationally mounted within the chamber of said housing for movement between a cocked position and a lancing position, said lancet having a lancet tip for passage through the lancet opening of said housing in the lancing position, and at least one finger for engaging the internal shoulder of said housing after firing to prevent reuse;
a spring engaged between said lancet and the flange of said housing to drive said lancet from the cocked position toward the lancing position upon firing of the lancing device; and
a cocking arm connected to said lancet, said cocking arm comprising a pair of shafts, a first end of each shaft connected to opposed sides of said lancet, and a second end of each shaft connected to a cocking grip, each shaft comprising a fin extending outwardly therefrom for releasable engagement with the flange of said housing to constrain said lancet in the cocked position, wherein said cocking arm further comprises a depth-adjustment knob for contacting the flange of said housing to limit the travel of said lancet at the lancing position.
10. The single-use lancing device of claim 9 , further comprising a sterility cap detachably mounted over the lancet tip.
11. The single-use lancing device of claim 10 , wherein the shafts extend through the flange and out of the second end of the housing and the fins releasably engage the flange in the cocked position to constrain the lancet in the cocked position.
12. The single-use lancing device of claim 9 , wherein said housing comprises first and second half-shells hingedly joined to one another.
13. The single-use lancing device of claim 9 , wherein the at least one internal shoulder of said housing is formed by an opposed pair of recesses within said housing between the first end of said housing and the flange.
14. The single-use lancing device of claim 13 , wherein the at least one finger of said lancet comprises a pair of fingers extending outwardly and away from the lancet tip.
15. The single-use lancing device of claim 14 , wherein each of said fingers is generally curved.
16. The single-use lancing device of claim 9 , wherein said spring retracts the lancet to prevent the lancet tip from extending through the lancet opening of said housing after firing the lancing device.
17. A single-use lancing device comprising:
a housing having a first end, a second end, a chamber between the first and second ends, and a flange extending across at least a portion of the chamber, the first end of the housing defining a lancet opening;
a lancet translationally mounted within the chamber of the housing for movement between a cocked position and a lancing position, the lancet having a lancet tip for passage through the lancet opening of the housing in the lancing position;
a spring engaged between the lancet and the housing to drive the lancet from the cocked position toward the lancing position upon firing of the lancing device; and
a cocking arm comprising a cocking grip disposed outside of the housing, at least one shaft extending through the housing and connecting the cocking grip to the lancet, and at least one fin for releasable engagement with the housing to constrain the lancet in the cocked position, wherein the cocking grip can be grasped and moved to retract the lancet to the cocked position and to charge the spring, and wherein in the cocked position the fin releasably engages the housing with an interference fit to constrain the lancet in the cocked position.
18. The single-use lancing device of claim 17 , wherein the shaft extends through the flange and out of the second end of the housing, the fin is disposed on and extends outwardly from the shaft, and the fin releasably engages the flange in the cocked position to constrain the lancet in the cocked position.
19. The single-use lancing device of claim 18 , wherein the fin is on a first-end side of the flange when the lancet is in the lancing position and on a second-end side of the flange when the lancet is in the cocked position, wherein when the cocking grip is moved to retract the lancet toward the cocked position the fin comes into contact with the flange and in response thereto the cocking arm deflects to allow the fin past the flange and into the releaseable engagement, and wherein the releaseable engagement of the fin and the flange constrains the lancet in the cocked position until a force is applied to the cocking grip sufficient to cause the shaft to deflect and release the fin from engagement with the flange to fire the lancing device.
20. The single-use lancing device of claim 18 , wherein the spring is engaged between the lancet and the flange and is compressed therebetween upon retraction of lancet to cocked position.
21. The single-use lancing device of claim 17 , wherein the cocking arm comprises two of the shafts connecting the cocking grip to the lancet, the shafts are generally parallel to each other and connected to opposed sides of the lancet and of the cocking grip, each of the shafts having one of the fins extending outwardly therefrom for releasable engagement with the housing to constrain the lancet in the cocked position.
22. The single-use lancing device of claim 21 , wherein the spring is disposed between the two shafts.