Magnetic lancet device
Embodiments of the present invention provide magnetic lancet devices and methods for driving a lancet. For example, a magnetic lancet device may include a driving mechanism having a plurality of magnets and a lancet coupled to the driving mechanism. A magnetic interaction between the plurality of magnets is configured to drive the lancet from an engaged position to a penetrating position.
1. A device, comprising:
a guide tube that is hollow and includes a driving end and a lancet end and a longitudinal axis extending between the driving end and lancet end;
a first magnet and a second magnet positioned on opposite sides along a length of the longitudinal axis of the guide tube;
a third magnet positioned within the guide tube;
a lancet housing coupled to an end of the third magnet disposed towards the lancet end; and
a lancet attached to an end of the lancet housing disposed towards the lancet end;
wherein a like pole of the first magnet and a like pole of the second magnet are configured to face one another in a repulsive interaction, and wherein a like pole of the third magnet is configured to face towards the lancet end.
2. The device of claim 1 , wherein:
the first magnet includes a first magnetic axis, wherein the first magnetic axis is a line extending between the poles of the first magnet;
the second magnet includes a second magnetic axis, wherein the second magnetic axis is a line extending between the poles of the second magnet; and
the first magnetic axis and the second magnetic axis are generally parallel to each other and the first magnetic axis and the second magnetic axis are generally perpendicular to the longitudinal axis of the guide tube.
3. The device of claim 2 , wherein, when the third magnet is disposed between the driving end and the first magnet and second magnet, the first magnet and the second magnet exert a repulsive force on the third magnet to magnetically hold the third magnet in an engaged position.
4. The device of claim 1 , further comprising a longitudinal driving member coupled to the third magnet, the longitudinal driving member being slidably received within the driving end of the guide tube.
5. The device of claim 1 , wherein the guide tube comprises one or more stops configured to abut the third magnet at the driving end.
6. The device of claim 5 , further comprising an end cap coupled to the driving end of the guide tube, wherein the end cap comprises a stop configured to prevent the lancet from advancing a predetermined distance from the driving end of the guide tube.
7. The device of claim 5 , further comprising a stop disposed at the lancet end of the guide tube configured to stop the third magnet at a predetermined position, the stop including an aperture for receiving the lancet.
8. The device of claim 7 , wherein the stop disposed at the lancet end of the guide tube is removably coupled to the guide tube.
9. The device of claim 7 , wherein the stop disposed at the lancet end of the guide tube is a magnetic stop configured to exert a repulsive force on the third magnet.
10. The device of claim 1 , wherein the like pole of the first magnet, the like pole of the second magnet, and the like pole of the third magnet are north magnetic poles.
11. The device of claim 1 , wherein the like pole of the first magnet, the like pole of the second magnet, and the like pole of the third magnet are south magnetic poles.
12. A device, comprising:
a guide tube that is hollow and includes a driving end and a lancet end and a longitudinal axis extending between the driving end and lancet end;
a pair of repulsive magnets positioned on opposite sides along a length of the longitudinal axis of the guide tube and generally perpendicular to the longitudinal axis of the guide tube, like poles of the pair of repulsive magnets facing one another in a repulsive interaction;
a carrier magnet positioned coaxially within the guide tube, the carrier magnet including a like pole that is disposed towards the lancet end and corresponds to the like poles of the pair of repulsive magnets; and
a lancet coupled to an end of the carrier magnet disposed towards the lancet end.
13. The device of claim 12 , wherein, when the carrier magnet is in an engaged position disposed between the driving end of the guide tube and the pair of repulsive magnets, the repulsive interaction between the pair of repulsive magnets exerts a repulsive force on the carrier magnet to magnetically maintain the carrier magnet in the engaged position.
14. The device of claim 12 , further comprising a lancet housing, wherein the carrier magnet is coupled to an end of the lancet housing disposed towards the driving end, and wherein the lancet is coupled to an end of the lancet housing disposed towards the lancet end.
15. The device of claim 12 , further comprising a longitudinal driving member coupled to the carrier magnet, the longitudinal driving member being slidably received within the driving end of the guide tube.
16. The device of claim 15 , further comprising a stop at the driving end of the guide tube configured to stop the carrier magnet at a predetermined position, the stop including an aperture for receiving the longitudinal driving member.
17. The device of claim 12 , wherein the pair of repulsive magnets and the carrier magnet are neodymium magnets.
18. The device of claim 12 , further comprising one or more stops on the guide tube configured to stop the carrier magnet at one or more predetermined positions.
19. The device of claim 12 , further comprising a stop disposed at the lancet end of the guide tube configured to stop the carrier magnet at a predetermined position, the stop including an aperture for receiving the lancet.
20. The device of claim 19 , wherein the stop is removably attached to the guide tube.
21. The device of claim 19 , wherein the stop is a magnetic stop configured to exert a repulsive force on the carrier magnet.
22. The device of claim 12 , wherein the like poles of the pair of repulsive magnets and the like pole of the carrier magnet are north magnetic poles.
23. The device of claim 12 , wherein the like poles of the pair of repulsive magnets and the like pole of the carrier magnet are south magnetic poles.
24. A method of driving a lancet, comprising:
providing a device that includes:
a guide tube that is hollow and includes a driving end and a lancet end and a longitudinal axis extending between the driving end and lancet end;
a first magnet and a second magnet positioned on opposite sides along a length of the longitudinal axis of the guide tube, the first and second magnets having magnetic axes extending between their north and south poles that are generally perpendicular to the longitudinal axis of the guide tube;
a third magnet positioned within the guide tube;
a lancet housing coupled to the end of the third magnet disposed towards the lancet end;
a longitudinal driving member coupled to an end of the third magnet disposed towards the driving end, the longitudinal driving member configured to be partially disposed within the guide tube; and
a lancet coupled to an end of the third magnet disposed towards the lancet end;
manually pushing the longitudinal driving member towards the lancet end of the guide tube, causing the third magnet and the lancet to move from an engaged position between the driving end of the guide tube and the first and second magnets to a position nearer to the lancet end of the guide tube; and
allowing a repulsive force of the first magnet and the second magnet to drive the third magnet and the lancet to a penetrating position, the lancet in the penetrating position protruding from the lancet end of the guide tube.
25. The method of claim 24 , further comprising allowing an attractive force of the first magnet and the second magnet to withdraw the third magnet and the lancet from the penetrating position to a disengaged position, the third magnet and the lancet in the disengaged position being disposed within the guide tube and between the first and second magnets and the lancet end of the guide tube.
26. The method of claim 24 , further comprising adjusting a depth of penetration of the lancet.
27. A method of driving a lancet, comprising:
providing a device that includes:
a guide tube that is hollow and includes a driving end and a lancet end and a longitudinal axis extending between the driving end and lancet end;
a pair of repulsive magnets positioned on opposite sides along a length of the longitudinal axis of the guide tube and generally perpendicular to the longitudinal axis of the guide tube, like poles of the pair of repulsive magnets facing one another in a repulsive interaction;
a carrier magnet positioned coaxially within the guide tube, the carrier magnet including a like pole that is disposed towards the lancet end and corresponds to the like poles of the pair of repulsive magnets; and
a lancet coupled to an end of the carrier magnet disposed towards the lancet end;
manually pushing the carrier magnet and the lancet from an engaged position towards the lancet end of the guide tube, the carrier magnet in the engaged position being disposed between the driving end of the guide tube and the pair of repulsive magnets; and
allowing a repulsive force of the pair of repulsive magnets to drive the carrier magnet and the lancet to a penetrating position, the lancet in the penetrating position protruding from the lancet end of the guide tube.
28. The method of claim 27 , further comprising allowing an attractive force of the pair of repulsive magnets to withdraw the carrier magnet and the lancet from the penetrating position to a disengaged position, the carrier magnet and the lancet in the disengaged position being disposed between the pair of repulsive magnets and the lancet end of the guide tube.
29. The method of claim 27 , wherein the providing step comprises biasing the lancet such that the lancet is maintained in the engaged position.