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, a penetrating end, and a longitudinal axis extending from the driving end of the guide tube to the penetrating end of the guide tube;
a first driving magnet positioned along a length of the longitudinal axis of the guide tube, the first driving magnet including a first magnetic axis extending from a first pole of the first driving magnet to a second pole of the first driving magnet, the first pole being disposed more proximate to the guide tube relative to the second pole, and the first magnetic axis being generally perpendicular to the longitudinal axis of the guide tube;
a carrier magnet positioned within the guide tube, the carrier magnet including a carrier magnetic axis extending from a first pole of the carrier magnet to a second pole of the carrier magnet, the first pole of the carrier magnet and the first pole of the first driving magnet being like poles, the carrier magnetic axis of the carrier magnet oriented generally parallel to the longitudinal axis of the guide tube and perpendicular to the first magnetic axis of the first driving magnet; and
a lancet coupled, directly or indirectly, to an end of the carrier magnet disposed towards the penetrating end of the guide tube;
wherein the first pole of the first driving magnet exerts a repulsive force on the first pole of the carrier magnet in a direction towards the driving end of the guide tube to magnetically hold the carrier magnet in an engaged position when the first pole of the carrier magnet is disposed between the driving end of the guide tube and the first pole of the first driving magnet.
2. The device of claim 1 , further comprising:
a lancet housing, wherein the carrier magnet is coupled to an end of the lancet housing disposed towards the driving end of the guide tube, and wherein the lancet is coupled to an end of the lancet housing disposed towards the penetrating end of the guide tube.
3. The device of claim 1 , further comprising:
a second driving magnet positioned along the length of the longitudinal axis of the guide tube, the second driving magnet including a first pole and a second pole, the first pole of the second driving magnet being disposed more proximate to the guide tube relative to the second pole of the second driving magnet;
wherein the first driving magnet and the second driving magnet are positioned on opposite sides of the guide tube, and wherein the first pole of the first driving magnet and the first pole of the second driving magnet are like poles and are configured to face one another in a repulsive interaction; and
wherein the first pole of the first driving magnet and the first pole of the second driving magnet exert a repulsive force on the first pole of the carrier magnet in a direction towards the driving end of the guide tube to magnetically hold the carrier magnet in an engaged position when the first pole of the carrier magnet is disposed between the driving end of the guide tube and the first pole of the first driving magnet.
4. The device of claim 3 , wherein:
the second driving magnet includes a second magnetic axis extending from the first pole of the second driving magnet to the second pole of the second driving magnet;
the first magnetic axis and the second magnetic axis extend along a continuous line; and
the second magnetic axis is generally perpendicular to the longitudinal axis of the guide tube.
5. The device of claim 4 , wherein the continuous line corresponds to a magnetic shift point.
6. The device of claim 5 , wherein the device can be calibrated to increase an activation sensitivity of the carrier magnet by decreasing a distance between the magnetic shift point and the driving end of the guide tube.
7. The device of claim 1 , 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.
8. The device of claim 7 , further comprising:
an end cap disposed on an end of the longitudinal driving member that is distal to the driving end of the guide tube.
9. The device of claim 1 , further comprising:
a release button configured to be depressed to displace the carrier magnet, the release button being slidably received within the driving end of the guide tube.
10. The device of claim 1 , wherein the guide tube comprises one or more stops positioned towards the penetrating end of the guide tube relative to the carrier magnet, the one or more stops being configured to stop the carrier magnet at one or more predetermined positions.
11. The device of claim 10 , wherein the one or more stops are magnetic stops configured to exert a repulsive magnetic force on the carrier magnet.
12. The device of claim 1 , wherein the first pole of the first driving magnet and the first pole of the carrier magnet are north magnetic poles.
13. The device of claim 1 , wherein the first pole of the first driving magnet and the first pole of the carrier magnet are south magnetic poles.
14. The device of claim 1 , wherein the first driving magnet, the carrier magnet, or both are neodymium magnets.
15. The device of claim 1 , further comprising:
an end cap that is removably coupleable to the penetrating end of the guide tube.
16. A device, comprising:
a guide tube that is hollow and includes a driving end, a penetrating end, and a longitudinal axis extending from the driving end of the guide tube to the penetrating end of the guide tube;
a first driving magnet positioned along a length of the longitudinal axis of the guide tube, the first driving magnet including a first magnetic axis extending from a first pole of the first driving magnet to a second pole of the first driving magnet, the first pole being disposed more proximate to the guide tube relative to the second pole, and the first magnetic axis being generally perpendicular to the longitudinal axis of the guide tube;
a carrier magnet positioned within the guide tube, the carrier magnet including a carrier magnetic axis extending from a first pole of the carrier magnet to a second pole of the carrier magnet, the first pole of the carrier magnet and the first pole of the first driving magnet being like poles, the carrier magnetic axis of the carrier magnet oriented generally parallel to the longitudinal axis of the guide tube and perpendicular to the first magnetic axis of the first driving magnet; and
a cradle coupled to an end of the carrier magnet disposed towards the penetrating end, wherein the cradle is configured to receive a lancet;
wherein the first pole of the first driving magnet exerts a repulsive force on the first pole of the carrier magnet in a direction towards the driving end of the guide tube to magnetically hold the carrier magnet in an engaged position when the first pole of the carrier magnet is disposed between the driving end of the guide tube and the first pole of the first driving magnet.
17. The device of claim 16 , further comprising:
a lancet housing; and
a lancet coupled to an end of the lancet housing disposed towards the penetrating end, wherein an end of the lancet housing disposed towards the driving end is insertable into the cradle to couple the lancet housing and the carrier magnet.
18. The device of claim 17 , wherein the lancet housing includes a magnetic insert for separably coupling the lancet housing and the carrier magnet.