The invention relates to a lancet for performing an incision. The lancet has a blade for providing an incision and a trigger housed in a housing. The trigger has a first trigger arm, a second trigger arm and a flexible member connected to the second trigger arm. A resilient member may be disposed within the housing in a pre-cutting state in which it stores energy and arranged to exert a force for moving the second trigger arm and the blade from a first stowed position through a cutting position and to a second stowed position.
1. A lancet comprising:
a housing;
a blade located in the housing;
a trigger comprising a first trigger arm, a second trigger arm connected to the first trigger arm through a hinge;
a flexible member connected to the blade, and to the second trigger arm at a location remote from the hinge, the flexible member configured to allow the blade to be maneuvered, upon activation of the trigger, in a nonlinear path from a first stowed position through a cutting position to a second stowed position; and
a resilient member disposed within the housing between portions of the first trigger arm and the second trigger arm remote from the hinge in a pre-cutting state in which energy is stored, the resilient member arranged to exert a force for moving a portion of the second trigger arm remote from the hinge away from the first trigger arm upon activation of the trigger to pull the blade in the nonlinear path.
2. The lancet as claimed in claim 1 , wherein the resilient member is secured to the first trigger arm and the second trigger arm.
3. The lancet as claimed in claim 1 , wherein the flexible member is connected to an end of the second trigger arm.
4. The lancet as claimed in claim 1 , wherein the housing comprises:
a first stop surface for abutting the second trigger arm with the blade in the first stowed position; and
a second stop surface for abutting the second trigger arm with the blade in the second stowed position, wherein the blade is within the housing in the first stowed position and the second stowed position.
5. The lancet as claimed in claim 4 , wherein the second trigger arm is configured to slide relative to the first stop surface responsive to movement of the first trigger arm.
6. The lancet as claimed in claim 5 , wherein the second trigger arm has a chamfered surface remote from the hinge.
7. The lancet as claimed in claim 4 , wherein the housing includes a rear member having the first stop surface and the second stop surface, the rear member positioned to define a gap between the second stop surface and an inner wall of the housing for receiving the second trigger arm and the blade in the second stowed position.
8. The lancet as claimed in claim 7 , further comprising a blade holder connected to the flexible member and holding the blade, the blade holder being configured to allow the blade to be maneuvered along the nonlinear path.
9. The lancet as claimed in claim 8 , wherein the housing includes cam elements of a size and shape for guiding the blade through the nonlinear path in cooperation with cam elements of the blade holder.
10. The lancet as claimed in claim 9 , wherein the cooperative cam elements of the housing and the blade holder are configured for guiding the blade through a parabolic path for performing an incision while in the cutting position.
11. The lancet as claimed in claim 9 , wherein the housing includes an additional cam element located and configured for contacting the blade holder and guiding the blade while leaving the cutting position toward the second stowed position.
12. The lancet as claimed in claim 1 , wherein the first trigger arm includes a base portion connected to the second trigger arm through the hinge, a second portion extending from the base portion, and a slider portion connected to the second portion, the second portion being configured, upon movement of the trigger, to allow the trigger to rotate about a pivot in the housing.
13. The lancet as claimed in claim 12 , wherein the slider portion is configured to be slidable along surfaces in the housing.
14. The lancet as claimed in claim 1 , wherein the resilient member is one of a helical torsion spring, a leaf spring, a cantilever spring or a helical compression spring.
15. The lancet as claimed in claim 14 , wherein the resilient member is a cantilever spring integral with the trigger, the cantilever spring being configured to store energy in the precutting state.
16. The lancet as claimed in claim 1 , wherein the resilient member is made of a resilient metal.
17. The lancet as claimed in claim 16 , wherein the resilient member is made of one of high carbon steel, stainless steel, alloy steel and nickel-based alloy.
18. The lancet as claimed in claim 1 , further comprising a trigger lock for preventing movement of the trigger.
19. The lancet as claimed in claim 1 , wherein the flexible member has an S-shaped profile.
20. The lancet as claimed in claim 1 , wherein the housing includes cam elements of a size and shape for guiding the blade through the nonlinear path.