Method and apparatus for lancet actuation
First Claim
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1. A lancet driver configured to exert a driving force on a lancet during a lancing cycle and used on a tissue site, said device comprising:
- a housing;
a drive force generator; and
a processor coupled to the drive force generator capable of changing the direction and magnitude of force exerted on the lancet during the lancing cycle, the processor having a control algorithm that provides an input to the drive force generator of a real time measurement of a penetrating member depth of penetration in said tissue site using the real time measurement to drive the penetrating member to a numerical depth that has been set through a feedback control system; and
a human interface on said housing providing at least one output,wherein said drive force generator holds said lancet at a fixed position against tenting force from said tissue site without contacting a mechanical stop.
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Abstract
A lancet driver is provided wherein the driver exerts a driving force on a lancet during a lancing cycle and is used on a tissue site. The driver comprises of a drive force generator for advancing the lancet and a processor coupled to the drive force generator capable of changing the direction and magnitude of force exerted on the lancet during the lancing cycle. The driver further includes a human interface on the housing providing at least one output for communicating with the patient.
1903 Citations
57 Claims
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1. A lancet driver configured to exert a driving force on a lancet during a lancing cycle and used on a tissue site, said device comprising:
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a housing; a drive force generator; and a processor coupled to the drive force generator capable of changing the direction and magnitude of force exerted on the lancet during the lancing cycle, the processor having a control algorithm that provides an input to the drive force generator of a real time measurement of a penetrating member depth of penetration in said tissue site using the real time measurement to drive the penetrating member to a numerical depth that has been set through a feedback control system; and a human interface on said housing providing at least one output, wherein said drive force generator holds said lancet at a fixed position against tenting force from said tissue site without contacting a mechanical stop.
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2. A lancet driver configured to exert a driving force on a lancet during a lancing cycle and used on a tissue site, said device comprising:
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a housing; a drive force generator; a processor coupled to the drive force generator capable of changing the direction and magnitude of force exerted on the lancet during the lancing cycle; a human interface on said housing providing at least one output; and wherein the processor actuates said drive force generator to drive the lancet at velocities in time that follow a selectable lancing velocity profile said selectable lancing velocity profile is selected from a set of alternative lancing velocity profiles having characteristic phases for lancet advancement and retraction, wherein said processor optimizes said velocity profile for subsequent lancing based upon elastic tenting associated with skin deformation in previous lancing events.
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3. A lancet driver configured to exert a driving force on a lancet during a lancing cycle and used on a tissue site, said device comprising:
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a housing; a drive force generator; a processor coupled to the drive force generator capable of changing the direction and magnitude of force exerted on the lancet during the lancing cycle; a human interface on said housing providing at least one output; and wherein the processor actuates said drive force generator to drive the lancet at velocities in time that follow a selectable lancing velocity profile said selectable lancing velocity profile is selected from a set of alternative lancing velocity profiles having characteristic phases for lancet advancement and retraction, wherein said lancet penetrating to a depth in the tissue site based on impedance measurements from a distal portion of the lancet in said tissue site.
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4. A lancet driver configured to exert a driving force on a lancet during a lancing cycle and used on a tissue site, said device comprising:
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a housing; a drive force generator; and a processor coupled to the drive force generator capable of changing the direction and magnitude of force exerted on the lancet during the lancing cycle; a human interface on said housing providing at least one output; and a sensor coupled to the drive force generator for signaling said generator to change the direction and magnitude of force exerted on the lancet during the lancing cycle, said sensor communicating with said processor, wherein the processor calculates an appropriate lancet diameter and geometry to collect a blood volume required by a user.
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5. A lancet driver configured to exert a driving force on a lancet during a lancing cycle and used on a tissue site, said device comprising:
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a housing; a drive force generator; and a processor coupled to the drive force generator capable of changing the direction and magnitude of force exerted on the lancet during the lancing cycle; a human interface on said housing providing at least one output; and a sensor coupled to the drive force generator for signaling said generator to change the direction and magnitude of force exerted on the lancet during the lancing cycle, said sensor communicating with said processor, wherein said processor has logic for learning and recording characteristics of said tissue site to optimize control of lancet velocity and lancet position in a manner that minimizes pain to the patient while drawing body fluid for sampling.
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6. A lancet driver configured to exert a driving force on a lancet during a lancing cycle and used on a tissue site, said device comprising:
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a housing; a drive force generator; and a processor coupled to the drive force generator capable of changing the direction and magnitude of force exerted on the lancet during the lancing cycle; a human interface on said housing providing at least one output; and a processor that actuates said drive force generator to drive the lancet at velocities in time that follow a selectable lancing velocity profile said selectable lancing velocity profile is selected from a set of alternative lancing velocity profiles having characteristic phases for lancet advancement and retraction.
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7. A lancet driver configured to exert a driving force on a lancet during a lancing cycle and used on a tissue site, said device comprising:
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a housing; a drive force generator; a processor coupled to the drive force generator capable of changing the direction and magnitude of force exerted on the lancet during the lancing cycle; a human interface on said housing providing at least one output; and wherein the processor actuates said drive force generator to drive the lancet at velocities in time that follow a selectable lancing velocity profile said selectable lancing velocity profile is selected from a set of alternative lancing velocity profiles having characteristic phases for lancet advancement and retraction, wherein the lancing velocity profile is selectable by a user of the lancing device.
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8. A lancet driver configured to exert a driving force on a lancet during a lancing cycle and used on a tissue site, said device comprising:
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a housing; a drive force generator; a processor coupled to the drive force generator capable of changing the direction and magnitude of force exerted on the lancet during the lancing cycle; a human interface on said housing providing at least one output; and wherein the processor actuates said drive force generator to drive the lancet at velocities in time that follow a selectable lancing velocity profile said selectable lancing velocity profile is selected from a set of alternative lancing velocity profiles having characteristic phases for lancet advancement and retraction, wherein said lancing velocity profile provides a lancet withdrawal velocity sufficiently slow to allow blood flowing from punctured blood vessels to flow into a wound channel in the tissue site created by the lancet, to follow the lancet out of the wound channel, and flow to a skin surface.
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9. A lancet driver configured to exert a driving force on a lancet during a lancing cycle and used on a tissue site, said device comprising:
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a housing; a drive force generator; a processor coupled to the drive force generator capable of changing the direction and magnitude of force exerted on the lancet during the lancing cycle; a human interface on said housing providing at least one output; and wherein the processor actuates said drive force generator to drive the lancet at velocities in time that follow a selectable lancing velocity profile said selectable lancing velocity profile is selected from a set of alternative lancing velocity profiles having characteristic phases for lancet advancement and retraction, wherein said velocity profile includes a lancet deceleration phase, after said lancet penetrates said tissue site and prior to withdrawal from said tissue site wherein said lancet velocity follows a programmable deceleration profile having said lancet stopping in the tissue site without a sudden hard stop.
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10. A lancet driver configured to exert a driving force on a lancet during a lancing cycle and used on a tissue site, said device comprising:
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a housing; a drive force generator; a processor coupled to the drive force generator capable of changing the direction and magnitude of force exerted on the lancet during the lancing cycle; a human interface on said housing providing at least one output; and wherein the processor actuates said drive force generator to drive the lancet at velocities in time that follow a selectable lancing velocity profile said selectable lancing velocity profile is selected from a set of alternative lancing velocity profiles having characteristic phases for lancet advancement and retraction, wherein the lancing velocity profile is selected by the lancing device based on optimization of lancing parameters from information obtained in previous lancing events.
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11. A lancet driver configured to exert a driving force on a lancet during a lancing cycle and used on a tissue site, said device comprising:
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a housing; a drive force generator; a processor coupled to the drive force generator capable of changing the direction and magnitude of force exerted on the lancet during the lancing cycle; a human interface on said housing providing at least one output; and wherein the processor actuates said drive force generator to drive the lancet at velocities in time that follow a selectable lancing velocity profile said selectable lancing velocity profile is selected from a set of alternative lancing velocity profiles having characteristic phases for lancet advancement and retraction, wherein said processor optimizes said velocity profile for subsequent lancing based upon success of obtaining a blood sample from said user in previous lancing events.
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12. A lancet driver configured to exert a driving force on a lancet during a lancing cycle and used on a tissue site, said device comprising:
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a housing; a drive force generator; a processor coupled to the drive force generator capable of changing the direction and magnitude of force exerted on the lancet during the lancing cycle; a human interface on said housing providing at least one output; and wherein the processor actuates said drive force generator to drive the lancet at velocities in time that follow a selectable lancing velocity profile said selectable lancing velocity profile is selected from a set of alternative lancing velocity profiles having characteristic phases for lancet advancement and retraction, wherein said processor optimizes said velocity profile for subsequent lancing based upon blood volume obtained from said user in previous lancing events.
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13. A lancet driver configured to exert a driving force on a lancet during a lancing cycle and used on a tissue site, said device comprising:
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a housing; a drive force generator; and a processor coupled to the drive force generator capable of changing the direction and magnitude of force exerted on the lancet during the lancing cycle; a human interface on said housing providing at least one output; and a mechanical damper disposed to minimize oscillation of the lancet in the tissue site when the lancet reaches an end point of its penetration stroke into said tissue site; and
a position sensor configured to detect lancet position during the lancing cycle. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. A lancet driver configured to exert a driving force on a lancet during a lancing cycle and used on a tissue site, said device comprising:
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a housing; a drive force generator; and a processor coupled to the drive force generator capable of changing the direction and magnitude of force exerted on the lancet during the lancing cycle; a human interface on said housing providing at least one output; wherein said force generator is configured to achieve a penetration stroke of the lancet at a lancet velocity between about 0.8 and 20.0 meter per second, and a position sensor configured to detect lancet position during the lancing cycle. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30)
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31. A lancet driver configured to exert a driving force on a lancet during a lancing cycle and used on a tissue site, said device comprising:
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a housing; a drive force generator; and a processor coupled to the drive force generator capable of changing the direction and magnitude of force exerted on the lancet during the lancing cycle; a human interface on said housing providing at least one output; and a sensor coupled to the drive force generator for signaling said generator to change the direction and magnitude of force exerted on the lancet during the lancing cycle, said sensor communicating with said processor, wherein said processor determines relative position and velocity of the lancet based on relative position measurements of the lancet with respect to time. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39)
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40. A lancet driver configured to exert a driving force on a lancet during a lancing cycle and used on a tissue site, said device comprising:
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a housing; a drive force generator; and a processor coupled to the drive force generator capable of changing the direction and magnitude of force exerted on the lancet during the lancing cycle; a human interface on said housing providing at least one output; a sensor coupled to the drive force generator for signaling said generator to change the direction and magnitude of force exerted on the lancet during the lancing cycle, said sensor communicating with said processor; and a memory for storage and retrieval of a set of alternative lancing profiles which the processor uses to modulate the drive force generator. - View Dependent Claims (41, 42, 43, 44, 45, 46, 47, 48)
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49. A lancet driver configured to exert a driving force on a lancet during a lancing cycle and used on a tissue site, said device comprising:
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a housing; a drive force generator; and a processor coupled to the drive force generator capable of changing the direction and magnitude of force exerted on the lancet during the lancing cycle; a human interface on said housing providing at least one output; and a sensor coupled to the drive force generator for signaling said generator to change the direction and magnitude of force exerted on the lancet during the lancing cycle, said sensor communicating with said processor, wherein the processor modulates the lancet driver by comparing an actual profile of the lancet to the profile and maintaining a preset error limit between the actual profile and the profile. - View Dependent Claims (50, 51, 52, 53, 54, 55, 56, 57)
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Specification