An adapter for permitting a medical diagnostic instrument having an illumination source including at least one led (light emitting diode) to be used with a power supply normally configured for use with a diagnostic instrument having at least one incandescent lamp as an illumination source. The adapter includes circuitry for compensating led specific characteristics for permitting the power supply to be used with the led.
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22. A method of using a diagnostic instrument, said method comprising the steps of:
providing an instrument with a releasably removable incandescent light source powered by a power supply;
removing the incandescent light source from the instrument; and
attaching an interchangeable adapter having an led light source and circuitry that operates with said power supply when said adapter is attached to said instrument to permit alternative operation of said instrument of each said light source.
21. A diagnostic instrument comprising:
a power supply;
an incandescent light source disposed in said instrument that is powered by said power supply; and
an adapter including at least one led light source, said adapter having circuitry to permit said at least one led light source to operate with said power supply when said adapter is attached to said instrument, said adapter being interchangeable with said incandescent light source to permit alternative operation of each said light source.
0. 100. An adapter for use with a medical diagnostic instrument originally configured with an incandescent lamp as an illumination source and a power supply specifically designed for powering said incandescent lamp,
said adapter having means for permitting at least one led to be used as the illumination source for said instrument and permitting said power supply to be used without alteration to enable energization of said at least one led, and
means for matching a polarity between said at least one led and said power supply.
43. A method for adapting a medical diagnostic instrument for use with at least one led as an illumination source, said instrument including a power supply typically only electrically configured for energizing an incandescent lamp as an illumination source, said method comprising the steps of:
adding an adapter to at least one of an instrument head, an instrument handle and said instrument power supply and electrically connecting said adapter to said power supply and said at least one led to energize same without modification to said power supply; and
matching the polarity between said at least one led and said power supply.
1. An adapter for use with a medical diagnostic instrument originally configured with an incandescent lamp as an illumination source and a power supply specifically designed for powering said incandescent lamp, and wherein:
said adapter having means is configured for permitting at least one led to be used as the illumination source for said instrument and permitting said power supply to be used without alteration to enable energization of proper supply of electrical power to said at least one led, and
means said adapter employing adapter electronics for matching a polarity of said supply of electrical power between said power supply and said at least one led and said power supply.
62. A method for adapting a medical diagnostic instrument for use with at least one led as an illumination source, said instrument including a power supply typically only electrically configured for energizing an incandescent lamp as an illumination source, said method comprising the steps of:
adding an adapter to at least one of an instrument head, and instrument handle and said instrument power supply and electrically connecting said adapter to said power supply and said at least one led to energize same without modification to said power supply, wherein said instrument includes at least one of at least one led and an incandescent lamp as the illumination source for said instrument, said method further including the additional steps of selectively activating said adapter depending on the illumination source provided in said instrument and of sensing the illumination source in said instrument.
0. 95. An adaptor that is configured for providing electrical power to a light emitting diode, comprising:
at least one output electrical contact through which output electrical power is transferred to at least one light-emitting diode;
at least one input electrical contact through which input electrical power is received from an input electrical power source that is designed to supply power to an non light-emitting diode light source; and
means for matching a polarity between said at least one light emitting diode and said power supply, wherein
said adaptor being configured to transfer power from said input electrical power source to said light emitting diode while said adaptor and said at least one light-emitting diode are incorporated into a hand held medical diagnostic device, enabling said device to project light from said at least one light emitting diode; and wherein
said device being configured to provide an opening through which to access said non light-emitting diode light source; and wherein
said adaptor is configured to be incorporated into said device via insertion of said adaptor through said opening of said device.
0. 82. An adaptor that is configured for providing electrical power to a light-emitting diode that is incorporated into a hand held device that was originally designed to project light via an incandescent illumination source, said adapter comprising:
at least one output electrical contact through which output electrical power is transferred to at least one light-emitting diode;
at least one input electrical contact through which input electrical power is received from an electrical power supply that is designed to supply power to an incandescent light source; and
means for matching a polarity between said at least one light emitting diode and said power supply and wherein
said adaptor is configured to transfer electrical power to said light emitting diode while said adaptor and said light-emitting diode are incorporated within a hand-held device,
said device having a body that is comprised of at least a first portion and a second portion that are mechanically attachable and detachable with respect to each other via a connection location of said device; and wherein
said adaptor is configured to be incorporated into said device via insertion of said adaptor through said connection location of said device,
for enabling said device to use light from said light emitting diode.
23. In combination, an adapter for use with a medical diagnostic instrument, said instrument including a power supply that is electrically configured for solely powering an instrument having an incandescent lamp as an illumination source, said medical diagnostic instrument including an instrument head, a hand-grippable handle and at least one led disposed in said instrument as the illumination source thereof, said adapter including means for electrically and mechanically interconnecting said power supply, and said at least one led to enable said at least one led to be used as said illumination source of said instrument and for effectively energizing said at least one led, said adapter being independently attached between said instrument head and said hand-grippable handle and wherein said instrument head and said hand-grippable handle further include interconnect means for interconnecting said instrument head to said handle for providing a mechanical interface and maintaining an electrical interface between said power supply and an incandescent lamp when an incandescent lamp is typically used in the instrument, and in which said adapter includes respective ends adapted to connect to said interconnect means to provide said mechanical interface while creating an electrical interface between said power supply and said at least one led.
0. 2. An adapter as recited in
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0. 16. An adapter as recited in
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0. 18. A method for adapting a existing medical diagnostic instrument so as to incorporate at least one white led as an illumination source, said existing instrument including a power supply for energizing a miniature incandescent bulb as an illumination source, said instrument including an existing instrument head and a existing instrument handle wherein said existing instrument head and said existing instrument handle include mating interconnecting ends which interlock said instrument head and said handle in a mechanical interconnection while simultaneously maintaining an electrical interface between said incandescent lamp and said power supply, said method including the steps of:
attaching an adapter between said instrument head and said instrument handle, said adapter including means for electrically interconnecting at least one led and said power supply as well as means for mechanically interconnecting said instrument head and said instrument handle; and
mounting said at least one led in one of said adapter and said instrument head.
0. 19. A method as recited in
0. 20. A method as recited in
0. 24. A combination as recited in
0. 25. A combination as recited in
0. 26. A combination as recited in
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0. 29. A combination as recited in
0. 30. In combination, an adapter for use with a medical diagnostic instrument, including a power supply that is electrically configured for solely powering an instrument having an incandescent lamp as an illumination source, said medical diagnostic instrument including an instrument as the illumination source thereof, said adapter including means for electrically and mechanically interconnecting said power supply and said at least one led to enable said at least one led to be used as said illumination source of said instrument and for effectively energizing said at least one led, wherein said adapter permits said at least one led to be energized by said power supply without modification thereof wherein said instrument includes at least one of at least one led and an incandescent lamp as the illumination source, said combination further including means for selectively activating said adapter depending on the illumination source provided in said instrument, including means for sensing the type of illumination source in said instrument.
0. 31. A combination as recited in
0. 32. A combination as recited in
0. 33. A combination as recited in
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0. 42. A combination as recited in
44. A method as recited in
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0. 53. A method as recited in
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0. 61. A method as recited in
63. A method as recited in
64. A method as recited in
65. A method as recited in
0. 66. A method as recited in
0. 67. A method as recited in
68. A method as recited in claim 67 62, wherein said at least one led is part of an led module and in which said method includes the step of disposing said adapter in at least a portion of said led module.
69. A method as recited in
70. A method as recited in
71. A method as recited in
0. 72. A method as recited in
0. 73. A method as recited in
74. A method as recited in
0. 75. A method as recited in
0. 76. A method as recited in cliam 75, including the step of optically filtering said at least one led.
0. 77. A method as recited in
78. A method as recited in claim 77 62, wherein said voltage compensating step includes the step of boosting voltage supplied to said at least one led.
79. A method as recited in
0. 80. A method as recited in
0. 81. The adapter of claim 1, wherein said adapter electronics are employed for turning on a first half H-bridge and turning on a second half H-bridge sequentially, and measuring and comparing a first resulting voltage and a second resulting voltage respectively, and determining whether a non-polarized illumination source is used if the resulting voltages are equal or whether a polarized illumination source is used if the resulting voltages are different, and determining whether there is a direction of polarity based upon the comparing of the resulting voltages in order to supply electrical power with proper polarity to said at least one light emitting diode.
0. 83. The adaptor of claim 82, wherein said device has a first portion that is an instrument head and a second portion that is an instrument handle.
0. 84. The adaptor of claim 82, wherein said adaptor is packaged within a one piece enclosure that includes or attaches to said light emitting diode.
0. 85. The adaptor of claim 82, wherein said adaptor is packaged to include a battery that functions as said electrical power source.
0. 86. The adaptor of claim 82, wherein said adaptor is current limiting.
0. 87. The adaptor of claim 82, wherein said adaptor is configured to convert electrical voltage of said input electrical power to energize said light-emitting diode.
0. 88. The adaptor of claim 82, wherein said adaptor is configured to convert said input electrical power to a proper polarity.
0. 89. The adaptor of claim 88, wherein said adaptor includes a diode bridge and a AC to DC converter configured for converting said input electrical power to current limited direct current at said proper polarity.
0. 90. The adaptor of claim 82, wherein said adaptor is configured to be selectively operated to supply electrical power to either said light emitting diode or an incandescent light source, in accordance with respective requirements of either said light emitting diode or said incandescent light source.
0. 91. The adaptor of claim 82, wherein said device is a medical diagnostic instrument.
0. 92. The adaptor of claim 82, wherein said adaptor and said light-emitting diode are configured to be physically substituted for a non-light emitting diode light source.
0. 93. The adaptor of claim 82, wherein said adaptor is configured to be incorporated into said device through one of a first interconnecting end and a second interconnecting end while said first interconnecting end and said second interconnecting end are detached from each other and wherein re-attachment of said interconnecting ends maintains electrical contact between said adapter and said light-emitting diode and between said adapter and said device.
0. 94. The adaptor of claim 83, wherein the adaptor is incorporated into the instrument head.
0. 96. The adaptor of claim 95, where said transfer of power includes transformation of one or more characteristics of said input electrical power to characteristics of said output electrical power.
0. 97. The adapter of claim 96, wherein said transformation includes transformation of at least one of a current, voltage and polarity characteristic of said power.
0. 98. The adapter of claim 95, wherein said adaptor is configured to be incorporated into said device through one of a first interconnecting end and a second interconnecting end while said first interconnecting end and said second interconnecting end are detached from each other and wherein re-attachment of said interconnecting ends maintains electrical contact between said adapter and said at least one light-emitting diode and between said adapter and said device.
0. 99. The adapter of claim 95, wherein said non light-emitting diode light source is an incandescent light source.
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The following application generally relates to the field of illumination, and more particularly to an LED illumination system intended for use with hand held medical diagnostic instruments, such as those used in a physician's or health care provider's office, or other medical environments.
Many manufacturers of hand-held medical diagnostic instrument products including otoscopes, ophthalmoscopes, et al., such as those from Heine Inc., Welch Allyn, Inc., and Keeler Instruments, among others, have long since utilized miniature incandescent lamps, such as halogen and xenon lamps, as illumination sources. These lamps are typically provided within the handle or the head of the instrument and utilize fiber optic bundles or other optical means to transmit the light from the miniature lamp to the tip opening of the diagnostic instrument, such as an ophthalmoscope, otoscope, or similar device.
Power sources for these lamps are typically either wall mounted or are portable, in the form of batteries provided in the instrument handle and having a nominal voltage of approximately 2.5 or 3.5 volts. These voltages are convenient values, since they match both a stacked arrangement of two or three Nickel cadmium batteries and 3.5 volts in particular is favored since it is also the voltage of a single lithium ion cell. Examples of instruments having same are described, for example, in U.S. Pat. Nos. 4,012,686, 5,559,422, 5,177,424, and 5,542,904.
More recently, there has been considerable interest in the field in light emitting diodes (LEDs) as a potential substitute for miniature incandescent lamps. White versions of these LEDs, such as those described, for example, in U.S. Pat. Nos. 6,069,440 and 5,998,925, among others, the entire contents of which are herein incorporated by reference, provide better illumination capability than predecessor LEDs and are therefore coveted for a myriad of applications due to their longer life, resistance to shock and impact loads, cooler operating temperatures and alternative spectral content as compared with the afore mentioned miniature incandescent lamps. Moreover and adding LEDs in general, such as color LEDs, provide additional benefits such as spectral tuning, IR, spectrally specific illumination, and the like.
It is a general desire in the field that future product improvements incorporating white LEDs as illumination sources be compatible with both the mechanical and electrical features of existing power supplies to which these instruments are interconnected. There are, however, a number of significant differences which must be recognized in the incorporation of the above illumination devices into any previously known medical diagnostic instrument. For example, white LEDs, such as those described above, experience a large variation in forward voltage as compared with miniature incandescent lamps, as well as significant differences in current versus light output and color characteristics. There are also mechanical issues relating to the incorporation of any adapter into a medical diagnostic instrument.
In summary, there is a need to develop an adaptive means which can be mechanically, optically and electrically incorporated into the design of a hand-held medical diagnostic instrument so as to permit an instrument having LEDs as an illumination source to be readily used with a variety of existing power supplies and charging apparatus. There is an additional need to enable current instrument heads which formerly used miniature incandescent lamps to utilize white or color LEDs with these existing power sources.
It is therefore a primary object of the present invention to overcome the above-noted deficiencies of the prior art.
It is another primary object of the present invention to develop electrical adapters that can permit LEDs, such as white LEDs, to be utilized in existing known hand-held medical diagnostic instruments without requiring major configuration changes to already existing power supplies and/or electrical charging apparatus.
It is yet another primary object of the present invention to provide an electrical adapter which permits white LEDs to be utilized in already existing hand-held diagnostic instruments, such as otoscopes, without significantly impacting the mechanical and/or optical function or design of the instruments.
Therefore and according to a preferred aspect of the invention, there is provided an electrical adapter for use with a medical diagnostic instrument typically configured with an incandescent lamp as an illumination source and a power supply for powering said incandescent lamp, said adapter having means for permitting at least one LED to be used as the illumination source for said instrument while permitting said existing power supply to used therewith.
Preferably, means are included for compensating LED-specific characteristics for permitting the power supply to be used with the medical diagnostic instrument. The adapter preferably includes an AC to DC converter in order to compensate for variations in forward voltage of at least one white LED used as an illumination source and to effect polarity discrepancies. The AC to DC converter can consist of, for example, at least one diode bridge or a MOSFET switch. The adapter also preferably includes means for compensating LED specific differences such as current, voltage boost, regulation, and color sense, thereby permitting use of the diagnostic instrument having at least one white LED with already existing power supplies and/or battery charging apparatus.
According to one preferred embodiment, the LED electrical adapter can be disposed within the head of the diagnostic instrument so as to permit interchangeability of illumination devices; that is, in which one interchangeable instrument head can include a miniature incandescent lamp and another interchangeable head includes a least one white LED and an electrical adapter permitting the LED to be utilized with the remainder of the instrument whether the instrument includes a wall mounted power supply or batteries.
Alternatively and according to yet another preferred embodiment, the LED electrical adapter can be fitted in lieu of a conventional battery within the instrument handle. The adapter, in fact, can be manufactured and sized so as to effectively replace a battery within the handle.
According to yet another preferred aspect of the invention, there is provided in combination, an adapter for use with a medical diagnostic instrument, said instrument including a power supply, electrically configured for powering an incandescent bulb as an illumination source, said instrument including an instrument head, a hand-grippable handle and at least one LED disposed in said instrument as the illumination source of said instrument, said adapter including means for electrically interconnecting said power supply and said at least one LED for effectively energizing said at least one LED.
According to still another preferred aspect of the present invention, there is provided a method for adapting a medical diagnostic instrument for use with at least one LED as an illumination source, said instrument including a power supply typically only electrically configured for energizing an incandescent lamp as an illumination source, said method comprising the steps of:
adding an adapter to at least one of said instrument head, said instrument handle, and said instrument power supply; and electrically connecting said adapter to said power supply and to said at least one LED to energize same without modification to said power supply.
According to yet another preferred aspect of the invention, there is provided a method for adapting a existing medical diagnostic instrument so as to incorporate at least one LED as an illumination source, said existing instrument including a power supply for energizing a miniature incandescent bulb as an illumination source, said instrument including an existing instrument head and a existing instrument handle wherein said existing instrument head and said existing instrument handle include mating interconnecting ends which interlock said instrument head and said handle in a mechanical interconnection while simultaneously maintaining an electrical interface between said incandescent lamp and said power supply, said method including the steps of:
attaching an adapter between said instrument head and said instrument handle, said adapter including means for electrically interconnecting at least one LED and said power supply as well as means for mechanically interconnecting said instrument head and said instrument handle; and
mounting said at least one LED in one of said adapter and said instrument head.
An advantage of the present invention is that the herein described electrical adapter permits a number of hand-held medical diagnostic instruments to be used with any previously existing power supplies or battery charging apparatus used therein without significant modification.
Still another advantage of the present invention is that the herein described electrical adapter permits each of the advantages of LEDs to be brought to the diagnostic instrument. These advantages which include longer lamp life, longer battery life, reduced maintenance, and higher reliability without significantly impacting cost which heretofore could not easily be brought to the instrument without significant redesign of the electrical system.
These and other objects, features, and advantages will become readily apparent from the following Detailed Description which should be read in conjunction with the accompanying drawings.
The following description relates in general to an LED electrical adapter that can be used in a hand-held medical diagnostic instrument, such as an ophthalmoscope, otoscope, vaginoscope, and the like, though the embodiments described herein detail a specific instrument, namely an otoscope.
Prior to discussing the invention and referring to
A miniature incandescent lamp 22, such as a halogen or xenon lamp, is provided in a lamp housing 25 that is disposed in a base 27 of the instrument head 18, the lamp being electrically connected through a contact 29 and a vertically extending pin 31 to a series of stacked Nickel cadmium batteries 26 that are retained in a bottom compartment of the instrument handle 14 for energizing the lamp 22. The instrument handle 14 also contains a bottom or lower contact spring 33. An adjustable voltage control 30 located on the exterior of the upper portion of the instrument handle 14 selectively adjusts the amount of illumination output provided by the miniature lamp 22.
In addition to the above and referring to
In the prior art examples illustrated in
Alternately and in lieu of batteries, a hand-held medical diagnostic instrument handle 50 can be tethered by means of a cord 52 directly to a wall transformer or similar power supply 54, such as shown in
With the preceding background and referring now to
As will be apparent from the following discussion, the mechanical and electrical design of the inventive adapter can assume a plurality of electrical, mechanical and electrical configurations covered in general by all or some features of the block diagram of
In general, the LED electrical adapter 60 includes a voltage conversion portion 84 and a compensation portion 100. Each of these features will now be described in greater detail. It should be noted that for illustration purposes that the compensation portion is presumed to be a current compensation portion, although other characteristics such as voltage, light output and/or color compensation are similarly implemented.
First, the voltage conversion portion 84 herein is an AC or DC converter which can be constructed, for example, as a simple diode bridge so as to provide proper selection of the forward voltage drop of at least one white LED package 64. Alternately, there are a number of so-called “no drop” MOSFET switches, such as those manufactured by Vishay-Siliconix, among others, could preferably facilitate the voltage conversion with minimal loss in power. Provision of this conversion portion 84 permits both AC and DC power supplies to utilized. In addition, any polarity mismatch between the LED package 64 and the previously utilized miniature incandescent lamp 22 would also be corrected using this converter portion.
That is to say, while miniature incandescent lamps are unaffected by opposite polarity from a power source. LEDs require unipolar DC current in order to illuminate.
The current compensation portion 100 can include each of the following: a general current compensation means 104 for provided a limited maximum current, and a high/low stopper regulator 108.
As far as simple current compensation is concerned, a resistor or a PTC (positive thermal coefficient e.g., thermistor) can be used, though it is believed this is not the optimal solution. There are two reasons for this belief. First, there are variabilities between LEDs in terms of output versus current. Therefore, this “solution” provides partial compensation to an “average” white LED in average conditions. Additionally, this form of current compensation may not adequately compensate under low and high supply voltage conditions because the resulting differential voltage between the power source and the LED forward voltage will be directly translated into current difference when using a PTC or resistor as the compensating element. In some instances, the LED forward voltage will be higher than the source voltage and therefore no conduction will occur at all. For instance, a typical 3.5 volt battery power handle ranges between 3.0 volts and 4.2 volts and a typical white LED (such as, for example, a Lumileds Luxeon LXHL-MWIA) has a forward voltage of between about 2.55 volts and about 3.99 volts. These low voltage conditions would occur as the batteries within the instrument handle discharge, or with low line or power supplies that are set at the low end of their manufacturing tolerances.
In addition, high voltage conditions could conversely cause excessive current to flow, resulting in very poor color or in the extreme, failure of the device itself. These high voltage conditions would occur with new, fully charged batteries, or at high line of power supplies set at the high end of manufacturing tolerances.
Regulating/limiting systems for current compensation can include for example, linear regulators, such as, for example, a National Semiconductor LM1117. Alternately, a bimetallic switch can be applied which can be set to create a duty cycle which averages a corrected current in order to produce a stable consistent output as long as the voltage provided by the power source is sufficiently above the forward voltage of the LED.
Referring to
An oscillator (U1) is assumed to be a voltage controlled oscillator having a base frequency and a duty cycle that is a function of the input voltage. There are many PWM (pulse width modulation) type devices available, and this circuit does not rely on any particular such device. Upon initial power up of the circuit, the voltage across a pair of resistors (R2) and (R3) would be zero, and the sense voltage would be zero. Once a comparator (U2) powers up, the sense voltage (zero at start) will be compared with the reference (U3) and a positive error signal will be generated. This error is fed to the oscillator (U1) which increases its on time cycle, thereby driving transistor (Q1) to turn on. The preceding causes current to flow through an inductor (L1) and stores energy as an electromagnetic field. During the “off” cycle of the oscillator (Q1) turns off and all current is then fed forward into a diode (D1). This feeding creates a voltage and drives current into the LED when the voltage becomes higher than the LED threshold (forward voltage) which is sensed via a pair of voltage dividers (R2) and (R3). If this voltage remains lower than the reference (U3), the error comparator (U2) continues to generate a positive error and the oscillator continues to increase its pulse width which increases the energy which is stored in (L1), and consequently the output voltage into the LED. When the output and therefore the sense voltage becomes higher than that of the reference (U3), the error comparator (U2) generating a negative error signal which decreases the oscillator on time to reduce the output voltage. This process continues and maintains the output close to the reference voltage that is selected. The reference voltage is chosen to be the optimum setting for LED operation.
While the above is a basis version, it should be noted that by including a resistor in series with the load, as shown in
Including an oscillator to the design of the current compensation portion as in
In addition, color will change as current is changed. Therefore, directly decreasing current to adjust light output, for example, will produce an undesirable variation in color. By utilizing either a duty cycle or pulse width modulation as a dimming “technique” for the LED, the LED is pulsed at virtually full power, but for shorter periods of time and therefore appears to dim. The current remains at the “normal” full on value during these pulses, therefore the color of the LED does not perceivably change as the LED is dimmed.
Depending on the degree of complexity and/or cost considerations, the oscillator can be replaced with a bimetallic element. This substitution also provides the opportunity to modify the light output by rapidly pulsing the LED at a duty cycle which represents the modified intensity desired.
Having described the basic circuitry and referring now to
Referring to
Referring to
In addition to and in complement of the herein described electrical adapter, an optical system can be added or modified to improve color. For example, a suitable filter and a collection lens can be placed at the light transmitting end of an LED having its top lens removed. The filter may also be part of this lens and the assembly may alternately be part of the LED or incorporated into part of the instrument head.
In addition to and in complement of the herein described electrical adapter, a means for detecting and switching the drive electronics from an LED version to an incandescent lamp version of a diagnostic instrument is beneficial, since this switching ability allows the same instrument to take advantage of each illumination system. There are several means for accomplishing this goal. The most basic technique is the incorporation of a mode switch which is manually actuated by the user of the instrument. This mode switch would connect the illumination to either the incandescent lamp drive circuitry or the LED drive circuitry based on the user's discretion.
The operation of an exemplary switch configuration is depicted in
The operation of the mode switch is based upon the combination of contact surfaces engaged. According to this embodiment, the incandescent lamp 228 is energized by supplying electrical energy from the handle or otherwise between contact surfaces 256 and 244, each of which are in direct contact with the lamp module 252.
In the embodiment of
As described, the adapter can provide a means for different contacts for the LED and the incandescent lamp, such that simply inserting the desired illumination device automatically selects the proper drive circuitry/configuration. In yet another alternative of the invention, the mechanical contact geometry can be the same for both illumination devices, and the adapter electronics can detect the presence or lack of polarity whether the illumination is an LED (polarized) or an incandescent bulb (not polarized). The above objective can be accomplished, in a preferred embodiment, using a microcontroller system such as illustrated in
Referring to
Though the following description has been made in terms of certain embodiments, it will be readily apparent that other modifications and variations are possible which encompass the spirit and scope of the herein claimed invention.
Krauter, Allan I., Salvati, Jon R., Vivenzio, Robert L., Strom, John R., Fahrenkrug, Corinn C., Davis, Peter J., Roberts, Chris R., Briggman, Shawn A., Pasik, Michael A., Stewart, Charles N.
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