US20090188811A1 - Preparation and maintenance of sensors - Google Patents

Abstract

Apparatus and methods are described for preparing, maintaining, and stabilizing sensors. The apparatus and methods for preparing sensors for use are utilized in advance of the sensor being removed from a sealed, sterilized package. The apparatus include packaging materials having electrical circuits capable of stabilizing a sensor to prepare the sensor for use. The methods for preparing a sensor for use includes methods of providing a solution to a sterilized packaging that contains a sensor connected to a sensor activating circuit, activating the circuit, and allowing the sensor to stabilize. These methods can be performed without compromising the packaging. The apparatus for stabilizing a sensor that is in use include a circuit connectable to the sensor that provides a signal to the sensor that prevents the sensor from becoming destabilized when disconnected from a monitoring device.

Description

CROSS-REFERENCE TO RELATED APPLICATION
• This application claims priority from U.S. provisional patent application No. 60/990,797, filed on Nov. 28, 2007, which is also hereby incorporated herein by reference.
BACKGROUND
• Before some sensors are capable of making their intended measurements, they go through some form of conditioning. The time it takes a sensor to be conditioned and become capable of making measurements is often referred to as its run-in period. Run-in periods can last for as little as a few minutes to as long as a few days. The type of conditioning and run-in time required for each type or kind of sensor will vary depending on the condition of the sensor and the intended purpose and design of the sensor being used. For example, electrochemical sensors often contain electrodes at which electrochemical reactions take place, an electrolytic solution or transport matrix in which the reactions take place, and a membrane to control the access of analyte species. Examples of the types of conditions that control the length of run-in time include the time it takes for the appropriate oxidation or reduction of chemical species at the electrodes before the desired reactions to take place, the consistency of the electrolytic solution or transport matrix, and the hydration of the membrane. Regardless of the type of conditioning required for a particular sensor, a sensor sealed within a container without access to required compounds or signals cannot undergo run-in conditioning.
SUMMARY
• Apparatus and methods for preparing and maintaining sensors, such as electrochemical sensors, are disclosed. The apparatus and methods for preparing sensors are utilized in advance of the sensor being removed from a sealed sterilized package. The apparatus for preparing sensors include packaging materials incorporating electrical circuits capable of exciting or stabilizing a sensor. The methods for preparing sensors include methods of providing a solution to a sterilized packaging containing a sensor connected to a sensor activating circuit without compromising the sterilizable packaging, activating a circuit electrically connected to the sensor, and allowing the sensor to stabilize. The providing and activating steps preferably occur without breaching the sterilized packaging.
• Further disclosed are apparatus for stabilizing a sensor that is in use. These apparatus include a circuit connectable to the sensor that provides a signal to the sensor that prevents the sensor from becoming destabilized when disconnected from a monitoring device. Such a circuit can prevent a sensor from becoming depolarized by, for example, providing an appropriate electrical current or potential. These apparatus can also include a rechargeable voltage source and/or a recordable storage medium that is capable of recording data related to a sensor.
DESCRIPTION OF DRAWINGS
• FIG. 1 is an illustration of an electrochemical sensor.
• FIG. 1A is a schematic of a circuit.
• FIG. 2 is a cross-sectional view of the working electrode of the electrochemical sensor ofFIG. 1.
• FIG. 3 is a perspective view of a sterilizable packaging in the form of a sealable pouch.
• FIG. 4 is a rupturable solution container in the shape of a cylinder.
• FIG. 5 is a cut away view of a sealable pouch with an alternative embodiment of a rupturable solution container that is partially formed using the back portion of the sealable pouch.
• FIG. 6 is a cut away view of a sealable pouch containing a sensor connected to a circuit capable of exciting the sensor.
• FIG. 7 is a cut away view of a sealable pouch containing a sensor connected to a circuit capable of exciting the sensor and a rupturable solution container.
• FIG. 8 is a block diagram showing a configuration of a sensor connected in series to a circuit then to a monitoring device.
• FIG. 9 is a block diagram showing an alternative configuration of the circuit connected to the sensor and monitoring device connected to the sensor not in series.
• FIG. 10 is a block diagram showing an alternative configuration with the circuit and the sensor integrated into a single unit and connected to a patient monitoring cable and a monitoring device in series.
• FIG. 11 is a block diagram showing an alternative configuration with the circuit integrated into a patient monitoring cable such that the circuit is not removed when the sensor is in use.
• FIG. 12 is a block diagram showing an alternative configuration with the circuit removeably connectable to a patient monitoring cable.
• FIG. 13 is a block diagram showing an alternative configuration with the circuit housed in a module to which the sensor and monitoring device can be connected.
• Like reference numerals and symbols in the various drawings indicate like elements.
DETAILED DESCRIPTION
• Apparatus and methods for preparing and maintaining sensors for use are disclosed herein. The apparatus and methods for preparing sensors for use are utilized in advance of the sensor being removed from a sealed sterilized package. The apparatus include packaging materials having electrical circuits capable of stabilizing a sensor to prepare the sensor for use. The methods for preparing a sensor for use include methods of providing a solution to a sterilized packaging that contains a sensor and activating a circuit electrically connected to the sensor. These methods can be performed without compromising the sterilized packaging and allow time for the sensor to stabilize.
• Further disclosed herein are apparatus for stabilizing a sensor that is in use. These apparatus include a circuit connectable to the sensor that provides a signal to the sensor that prevents the sensor from becoming destabilized when disconnected from a monitoring device. A circuit for stabilizing a sensor during use can be similar to or the same as a circuit for preparing a sensor for use.
• As shown inFIG. 1, asensor10 for measuring an analyte includes areference electrode20, anoptional counter electrode30, and a workingelectrode40 provided on asubstrate50. The electrodes (20,30,40) are formed of a conductive material. Thereference electrode20 can be, for example, an Ag/AgCl electrode. Thecounter electrode30 and workingelectrode40 can be, for example, graphite and platinum. In operation, thereference electrode20 establishes a fixed potential from which the potential of thecounter electrode30 and workingelectrode40 can be established. Thecounter electrode30 provides a working area for conducting the majority of electrons from, for example, an oxidation reaction back to the solution being analyzed, i.e., blood. Otherwise the current generated from the chemical reaction would pass through thereference electrode20 and possibly reduce its service life. Electricallyconductive wires60 are connected to thereference electrode20 and workingelectrode40 for applying and/or measuring current or potential at or between the electrodes. Although thesensor10 shown inFIG. 1 includes onereference electrode20, onecounter electrode30, and one workingelectrode40, electrochemical sensors can include multiple reference electrodes, counter electrodes, and working electrodes as would be understood by one of skill in the art.
• The electricallyconductive wires60 can be connected to a circuit. An example of acircuit62 is shown inFIG. 1A. Acircuit62 can include aparallel resistor64 to limit voltage drop, aswitch66, and avoltage source68 such as a battery, as shown inFIG. 1A. Such acircuit62 can be a current controlled voltage source that provides a constant voltage. An example of a range of voltages for use in such acircuit62 is about 0.2 V to about 2 V, other ranges of voltages include about 0.4 V to about 1.5 V, about 0.5 V to about 1 V, and about 0.6 V to about 0.7 V. Other circuit designs that provide a current controlled voltage source that provides a constant voltage will be apparent to one of skill in the art. For example, other electrical components can be used instead of or with theparallel resistor64 such as a capacitor to help control the voltage of the circuit.
• FIG. 2 shows a cross-section of the area enclosed by thedashed area55 inFIG. 1. InFIG. 2, the workingelectrode40 is covered by an analyteselective membrane70 which also covers areagent layer80.Reagent layer80 is selected to react with one or more specific analytes found or expected to be found in a fluid to be analyzed. For example, in a glucose biosensor, thereagent layer80 can contain glucose oxidase, such as may be derived fromAspergillus niger(EC 1.1.3.4), type II or type VII.Reagent layer80 can also include a matrix such as a hydrogel to promote a reaction between the reagent and an analyte that passes through themembrane70. A hydrogel, for example, can be water absorbent and swell to provide active transport of an analyte in a fluid under analysis (e.g., glucose) from the fluid into thereagent layer80.
• An apparatus for preparing a sensor for use in advance of the sensor being removed from a sealed sterilized package is shown inFIG. 3.FIG. 3 is a perspective view of a sterilizable packaging in the form of asealable pouch100. AlthoughFIG. 3 illustrates asealable pouch100, any other form of sterilizable packaging can be used in accordance with the invention. Thesealable pouch100 is made of a material such as a polymer that can maintain a sterilized environment and is typically liquid and vapor impermeable. Thesealable pouch100 is referred to as being sealable rather than sealed because, as depicted, oneend110 is open. Thesealable pouch100 can be sealed using an adhesive composition or heat sealing (melting) in the case of a polymer. Techniques for sealing sterilized containers are well known to those of skill in the art. Thesealable pouch100 can be made from flexible materials or a mixture of flexible, rigid, or substantially rigid materials. For example, the sealable pouch could include a rigid back portion, i.e., a rigid backing, and a flexible front portion.
• Also shown inFIG. 3 is aresealable portion112. Theresealable portion112 can be used to provide solution to thesealable pouch100. Theresealable portion112 can for example be a self-sealingmembrane114 through which a syringe can be inserted. Alternatively, or in addition to theresealable portion112 is shown a partial view of arupturable solution container120 that is inserted into thesealable pouch100. Therupturable solution container120 is also shown inFIG. 4. As shown, therupturable solution container120 is cylindrical, though other shapes and configurations are possible. Additionally, the size of therupturable solution container120 can be varied to accommodate the volume of solution desired to be delivered to thesealable pouch100.
• Therupturable solution container120 is made from a material, such as a polymer, that is more easily ruptured than the material used to make thesealable pouch100. A more easily ruptured material is used so therupturable solution container120 can be ruptured while on the interior of thesealable pouch100 using forces that will not breach thesealable pouch100. For example, thesealable pouch100 will not be breached at any point along the material used to form thesealable pouch100 or any point where two or more portions of thesealable pouch100 are sealed together, e.g., along a seam, when the rupturable container is ruptured. The ability to maintain the integrity of thesealable pouch100 allows the maintenance of a sterilized state for any contents of thesealable pouch100. Therupturable solution container120 can be attached to an inner portion of thesealable pouch100 through the use, for example, of an adhesive or by forming the rupturable solution container as part of the sealable pouch. Attaching therupturable solution container120 to an inner portion of thesealable pouch100 can provide consistency in the positioning of therupturable solution container120 for ease of use. The terms rupture and breach and their derivatives are used herein to indicate that a container has been opened such that the contents of a container are able to move from the interior of the container to the exterior of the container. It is noted that the solution can be provided in therupturable solution container120 when thesealable pouch100 is sealed and shipped and/or stored, or the sealable pouch can be sealed and the rupturable solution container filled through the use of aresealable portion112 and a syringe as discussed above.
• An alternative design for therupturable solution container130 is shown inFIG. 5. InFIG. 5, arupturable solution container130 is shown in which a portion of therupturable solution container130 is formed by aninterior surface140 of thesealable pouch100. Aseal150 between theperimeter160 of therupturable solution container130 and theinterior surface140 of thesealable pouch100 attaches therupturable solution container130 to theinterior surface140 of thesealable pouch100 and prevents solution from leaking prematurely from therupturable solution container130. In this embodiment of arupturable solution container130, the more easily ruptured material is used to form theinterior side170 of therupturable solution container130, which ruptures prior to a breach of the material used to form thesealable pouch100 to allow the solution into thesealable pouch100.
• The types of polymers or other materials for use in such containers can include, for example, polypropylene or polyethylene film or sheet. The tear strength, i.e., the resistance of a material to tear forces (as might be measured by ASTM D 1922), is a relevant property for the apparatus and methods described herein. For example, the relative tear strengths of the materials used for therupturable solution container120 and thesealable pouch100 are important in determining the material for use as therupturable solution container120 in that the tear strength of the material for use as therupturable solution container120 will be less than the tear strength of thesealable pouch100.
• Thesealable pouch100 described herein can be used to contain a sensor such as an electrochemical sensor. An example of an electrochemical sensor is a blood glucose sensor. The run-in period for a sensor located in asealable pouch100 as described herein that has a sensor sealed inside can be begun by providing an electrolytic, i.e., conductive, solution to thesealable pouch100. The electrolytic solution can be medically safe and non-toxic, e.g., sterile saline. The electrolytic solution can be provided from an external source or contained, for example, in arupturable solution container120, which can provide solution to thesealable pouch100 when ruptured. As used herein, run-in time is the time it takes for the sensor to reach equilibrium and to be ready for measurement. Once the electrolytic solution is provided or therupturable solution container120 is breached, the solution can spread into thesealable pouch100 and contact the sensor. Electrolytic solution can be provided, for example, by introducing a solution through a resealable portion of the sealable pouch, such as, for example, by injection through theresealable membrane114.
• Once contacted by the solution, the run-in period can begin with respect to, for example, hydration. Run-in time can be considered to include multiple phases such as hydration (i.e., the time for the sensor to come into contact and equilibrate with a solution) and polarization (i.e., the time for the sensor to stabilize once voltage is applied to the sensor). These phases can occur simultaneously or overlap. If aspects of the sensor other than hydration remain to be activated or run-in after exposure to the solution, such as aspects of the sensor that are dependent on the presence of an electric potential, these aspects for preparing the electrode can then be performed after the solution is added. If the circuit is connected to the sensor prior to the addition of solution, both hydration and electrical stabilization can begin as soon as the system comes into contact with the electrolytic solution. Electrical stabilization of the sensor can include non-Faradaic responses.
• To run-in the electrical aspects of a sensor contained in asealable pouch100, a sensor can be connected to a circuit designed to excite the sensor, such as, for example, the circuit shown inFIG. 1A. As shown inFIG. 6, asensor200 can be electrically connected to a circuit capable of exciting thesensor300 with both thesensor200 and circuit capable of electrically exciting thesensor300 located within thesealable pouch100. Thecircuit300 can be provided in the sterilizedsealable pouch100 and can be activated within thesealable pouch100 without exposing thesensor200 to the outside environment. The circuit capable of electrically exciting thesensor300 can be manually activated through the use of a force external to thesealable pouch100 such as by the activation of a switch, remotely activated through the use of an external signal, or automatically activated upon the provision of a solution to thesealable pouch100. For example, an electrical connection for activating thecircuit300 can be provided on a surface of thesealable pouch100 and manually activated without opening the pouch or a complete circuit can be integrated into thesealable pouch100 that is activated upon the provision of an electrolytic solution. As used herein, the phrase “excite the sensor” refers to providing an electrical signal to thesensor200 such that the sensor achieves, remains at or close to, or approaches a condition at which it can take sensor readings with little or no additional electrical preparation. Such an electrical signal can include, for example, a current controlled constant or periodic potential provided by, for example, a current controlled voltage source that provides a constant voltage, which is applied to a reference electrode12 and/or a working electrode16 such as those shown inFIG. 3. The number and type of electrical signals can depend on the number and state the electrodes will need to be in when thesensor300 is used for sensing.FIG. 7 shows an embodiment in which a circuit capable of electrically exciting thesensor300 and alternatively aresealable portion112 and/or arupturable solution container120 are included in asealable pouch100. In this embodiment, the circuit capable of electrically exciting thesensor300 can be activated at or around the time therupturable solution container120 is ruptured through, for example, the use of a fluid sensor located within the pouch.
• Methods for preparing a sensor for use include providing a solution such as an electrolytic solution to a sterilized packaging containing a sensor without compromising the sterilizable packaging then allowing the sensor to stabilize in the solution. The sensor can be connected to a sensor activating circuit before or after the provision of the electrolytic solution. If the sensor is connected to a sensor activating circuit after solution is provided, the sensor activating circuit can be activated and the electrical aspects of the system can be run-in. The circuit can be activated by an external force, such as moving a switch, or automatically when the solution is provided. For example, solution can be provided and a switch activated to initiate the sensor activating circuit. For further example, solution can be provided and the sensor activating circuit can be activated by the presence of solution. Such sensors are described above and can include a glucose sensor. Examples of solutions for use with the apparatus and methods herein include, but are not limited to, buffer solutions, saline solutions, solutions containing electrolytes or other chemicals needed either for chemical reactions at the electrodes or for other electrode preparations, and mixtures thereof.
• The several sensor run-in preparations described herein may or may not completely prepare a sensor for use. However, the sensor will be closer to an operational state than if the run-in preparations did not occur. When a glucose sensor, for example, is in use, hydrogen peroxide is produced in the presence of glucose at the electrode, the hydrogen peroxide is converted to electrons, and the electrons are measured at the working electrode. When a glucose sensor is first exposed to glucose there is a lag time before electrons are produced at a steady-state indicating the glucose level. After a steady-state is obtained, if voltage is discontinued to the electrodes, the sensor depolarizes, i.e., electrons are no longer attracted to the working electrode, but the reaction to form hydrogen peroxide still occurs. Thus, when a potential is again applied to the electrodes the excess hydrogen peroxide needs to be converted and the measurement from the sensor will appear higher than the actual glucose level. In both the start up and restart scenarios, the sensor takes some time to equilibrate and provide a steady-state reading indicative of the glucose level.
• Also provided herein, are apparatus for stabilizing a sensor that is being prepared for use, e.g., during initial implantation, or already in use. These apparatus include a circuit connectable to a sensor for providing a signal, such as an electrical current or potential, to the sensor. Such a signal can include, for example, a constant or periodic potential applied to a reference electrode12 and/or a working electrode16 such as those shown inFIG. 3. The signal chosen to be sent to the sensor is one that prevents the sensor from becoming destabilized prior to being connected or upon being disconnected from a monitoring device. For example, the circuit can prevent the sensor from becoming depolarized. When the electrodes of a sensor become depolarized the sensor cannot be used immediately and another run-in period becomes necessary to repolarize the electrodes. A glucose sensor, for example, has a chemical component to maintain a stabilized state, i.e., if a glucose sensor is in the presence of glucose, hydrogen peroxide conversion takes place and excess hydrogen peroxide will need to be converted prior to obtaining accurate glucose level readings. However, if the glucose sensor retains its electrical potential excess hydrogen peroxide does not accumulate at the working electrode.
• As shown inFIG. 8, asensor400 can be connected to acircuit500 and amonitoring device600.FIG. 9 shows an alternative configuration in which thecircuit500 andmonitoring device600 are not connected to thesensor400 in series, i.e., there are two possible connections to thesensor400. In either configuration, to stabilize asensor400, i.e., maintain thesensor400 in an active, useable state, a signal is continually provided to excite thesensor400. Maintaining a signal to excite thesensor400 is accomplished by maintaining a connection with a power source, such as a power source from either thecircuit500 ormonitoring device600. Alternatively, a signal to excite thesensor400 is provided by another source, such as a battery of a charged capacitor communicating with thesensor400. As described above, thesensor400 can be an electrochemical sensor such as a glucose sensor.
• Thecircuit500 can be configured to connect to asensor400 continuously such that thecircuit500 is connected to thesensor400 both when thesensor400 is connected to and when thesensor400 is disconnected from amonitoring device600. Alternatively, acircuit500 can be configured to be capable of being removed from thesensor400 when thesensor400 is connected to amonitoring device600 or an alternate signal source and reconnected to thesensor400 when thesensor400 is to be disconnected from themonitoring device600, with the provision that a signal to excite thesensor400 is continually applied to thesensor400. In a further alternative as shown inFIG. 10, thesensor400 andcircuit500 are integrated into a single unit. In an additional alternative, thesensor400 andcircuit500 are integrated into a single unit that is disposable.
• If thesensor400 is connected to, for example, apatient monitoring cable510, thecircuit500 can either be integrated into thecable510 so it is not removed when thesensor400 is in use as shown inFIG. 11, or thecircuit500 can be removeably connectable to thepatient monitoring cable510 as shown inFIG. 12. If thecircuit500 is removeably connectable to apatient monitoring cable510, themonitoring device600 to which thepatient monitoring cable510 is connected is capable of providing a signal to thesensor400. Then, when thepatient monitoring cable510 is to be disconnected from themonitoring device600, thecircuit500 provides a signal to thesensor400 in the absence of the signal from themonitoring device600. When thecircuit500 is integrated into a device, such as apatient monitoring cable510, and thecircuit500 is not disconnected from thesensor400 when thesensor400 is connected to amonitoring device600, thecircuit500 can be configured such that there is a manual mechanism for disconnecting thecircuit500 from thesensor400 or thecircuit500 can be configured to automatically disconnect in the presence of another signal source, e.g., a voltage source. Alternatively, when thesensor400 is connected to themonitoring device600, thecircuit500 can continue to provide a signal to thesensor400 with themonitoring device600 providing power for thecircuit500 to operate or charging the power source of thecircuit500. Such circuit aspects are easily designed and implemented by those of skill in the art.
• As shown inFIG. 13,circuits500 such as those described can be housed inmodules520 to which asensor400 can be connected and which can be in turn connected in series to amonitoring device600. Amonitoring device600 can be configured to accept amodule520 containing acircuit500.
• Acircuit500 can include a rechargeable voltage source, e.g., a rechargeable battery. Thecircuit500 can be configured to recharge the rechargeable power source when the circuit is connected to a monitoring device. Alternately, the rechargeable power source can be charged or recharged at a charging station which can be used to initially charge a rechargeable voltage source connected to acircuit500 or maintain a charge if asensor400 remains disconnected from amonitoring device600 for an extended period of time. A recharging station can have multiple positions for simultaneously chargingmultiple circuits500.
• As an additional feature, a recordable storage medium (not shown) can be included in thecircuit500. The recordable storage medium, such as an electrically erasable programmable read-only memory (EEPROM), can, for example, record data corresponding to thesensor400. Data corresponding to thesensor400 can include time data, such as total time in service or time since last connected to amonitoring device600, calibration data, or sensor reading or condition data. Such data can, for example, be recorded from sensor readings, internal timing devices, orother sensor400 orcircuit500 generated data, or transferred to thecircuit500 prior to thesensor400 being disconnected from amonitoring device600. Then, conversely, when thesensor400 is connected to adifferent monitoring device600, some or all of the data can be transferred to the newly connected (or reconnected)monitoring device600 to enable the new (or reconnected)monitoring device600 to prepare thesensor400 to begin collecting data, thereby reducing the needed run-in and/or calibration time. If a large enough memory capacity is available, all or many of the measurements made by asensor400 during a monitoring period could be stored in thecircuit500 for retrieval by a number of different monitors. Further features of thecircuit500 can include the ability to wirelessly transmit data to a monitoring device when asensor400 is detached from the monitoring device and the ability to log readings upon disconnect (either accidental or intentional) for transmittal to a monitoring device when reattached.
• Circuits500 such as those described can be housed in modules to which asensor400 can be connected and which can be in turn connected in series to amonitoring device600. Such acircuit500 can also be integrated into a device containing asensor400. Amonitoring device600 can be configured to accept a module containing acircuit500. Further,sensors400 can, for example, be incorporated into devices including medical devices such as patient monitoring cables.Circuits500 can be, for example, incorporated into devices incorporating sensors or devices designed to connect to sensors. Where a storage capacitor is used as a signal source as described above, it can also be incorporated into devices in the same manner as thecircuit500.
• The present invention is not limited in scope by the embodiments disclosed herein which are intended as illustrations of a few aspects of the invention and any embodiments which are functionally equivalent are within the scope of this invention. Various modifications of the apparatus and methods in addition to those shown and described herein will become apparent to those skilled in the art and are intended to fall within the scope of the appended claims. Further, while only certain representative combinations of the apparatus and method steps disclosed herein are specifically discussed in the embodiments above, other combinations of the apparatus components and method steps will become apparent to those skilled in the art and also are intended to fall within the scope of the appended claims. Thus a combination of components or steps may be explicitly mentioned herein; however, other combinations of components and steps are included, even though not explicitly stated. The term “comprising” and variations thereof as used herein is used synonymously with the term “including” and variations thereof and are open, non-limiting terms.

Claims (42)

1. An apparatus comprising:

a sterilizable packaging; and

a sensor stabilizing circuit connectable to the interior of the sterilizable packaging, the circuit capable of stabilizing a sensor.

2. An apparatus as defined inclaim 1, wherein the sterilizable packaging is sealed.

3. An apparatus as defined inclaim 2, wherein the circuit is capable of being activated without disrupting the seal of the sterilizable packaging.

4. An apparatus as defined inclaim 1, further comprising a sensor contained within the sterilizable packaging.

5. An apparatus as defined inclaim 4, wherein the sensor is a glucose sensor.

6. An apparatus as defined inclaim 1, further comprising a resealable port for the addition of an electrolyte solution.

7. An apparatus as defined inclaim 4, further comprising a rupturable solution container located within the sterilizable packaging.

8. An apparatus as defined inclaim 7, wherein the rupturable solution container is attached to an interior portion of the sterilizable packaging.

9. An apparatus as defined inclaim 7, wherein a portion of the rupturable solution container is formed by the sterilizable packaging.

10. An apparatus comprising:

a sterilized packaging;

a sensor, the sensor sealed within the sterilized packaging; and

a circuit electrically connected to the sensor, the circuit capable of exciting the sensor.

11. An apparatus as defined inclaim 10, wherein the circuit is capable of being activated without disrupting the seal of the sterilizable packaging.

12. An apparatus as defined inclaim 10, further comprising a resealable port for the addition of an electrolyte solution.

13. An apparatus as defined inclaim 12, wherein the resealable port is a self-sealing membrane.

14. An apparatus as defined inclaim 10, further comprising a rupturable solution container located within the sterilized packaging.

15. An apparatus as defined inclaim 14, wherein the rupturable solution container is attached to an interior portion of the sterilizable packaging.

16. An apparatus as defined inclaim 14, wherein a portion of the rupturable solution container is formed by the sterilizable packaging.

17. An apparatus as defined inclaim 10, wherein the circuit is activated by a force external to the sterilized packaging.

18. An apparatus as defined inclaim 10, wherein the sensor is a glucose sensor.

19. A method of preparing a sensor for use comprising:

providing an electrolyte solution to a sterilized packaging containing a sensor connected to a sensor activating circuit without compromising the sterilizable packaging;

activating the sensor activating circuit; and

allowing the sensor to stabilize in the electrolyte solution.

20. The method ofclaim 19, wherein the sensor is a glucose sensor.

21. The method ofclaim 19, wherein the electrolyte solution is provided via a resealable port in the sterilized packaging.

22. The method ofclaim 19, wherein the electrolyte solution is provided via a rupturable solution container.

23. The method ofclaim 19, wherein the circuit is activated when the electrolyte solution is provided.

24. An apparatus for stabilizing a sensor comprising:

a circuit connectable to a sensor, the circuit providing a signal to the sensor that prevents the sensor from becoming destabilized when disconnected from a monitoring device.

25. An apparatus as defined inclaim 24, wherein the circuit prevents the sensor from becoming depolarized.

26. An apparatus as defined inclaim 24, wherein the sensor is a glucose sensor.

27. An apparatus as defined inclaim 24, wherein the apparatus is incorporated into the sensor.

28. An apparatus as defined inclaim 24, wherein the signal is an electrical current or potential.

29. An apparatus as defined inclaim 24, further comprising an internal power source.

30. An apparatus as defined inclaim 29, wherein the internal power source is rechargeable.

31. An apparatus as defined inclaim 29, wherein the internal power source is a battery.

32. An apparatus as defined inclaim 24, further comprising a timing device.

33. An apparatus as defined inclaim 32, wherein the timing device is a clock.

34. An apparatus as defined inclaim 24, further comprising a recordable storage medium capable of recording data for the sensor.

35. An apparatus as defined inclaim 34, wherein the recordable storage medium is electrically erasable programmable read-only memory.

36. An apparatus as defined inclaim 34, wherein the data is transmitted between a monitoring unit and the circuit when the sensor is connected to the monitoring unit.

37. An apparatus as defined inclaim 34, wherein the data is generated by an internal timing device.

38. An apparatus as defined inclaim 34, wherein the data is generated by the sensor.

39. An apparatus as defined inclaim 24, further comprising a wireless communication device for communicating with a monitoring device.

40. An apparatus as defined inclaim 39, wherein calibration data is transferred between the circuit and the monitoring device.

41. An apparatus as defined inclaim 24, further comprising a recordable storage medium capable of recording sensor readings.

42. An apparatus as defined inclaim 41, wherein the recordable storage medium records the readings of the sensor.

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