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A liquid medication delivery device for, and a method of, delivering medication from a cartridge having a moveable piston at one end is disclosed. The piston has a first wall face that contacts the liquid in the cartridge and a second wall for engaging a piston rod that drives the piston. The first

A liquid medication delivery device for, and a method of, delivering medication from a cartridge having a moveable piston at one end is disclosed. The piston has a first wall face that contacts the liquid in the cartridge and a second wall for engaging a piston rod that drives the piston. The first and second walls are moveable but the second wall tends to move more quickly then the first during administration of a dose of medication from the cartridge. To compensate for this difference in movement between the first and second wall faces, the rod first moves a distance corresponding to the amount that the first wall face must move to deliver the desired dose and then it continues to move past this position by an amount known as an overshoot distance. It is then retracted by a distance equal to the overshoot distance.

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A liquid medication delivery device for, and a method of, delivering medication from a cartridge having a moveable piston at one end is disclosed. The piston has a first wall face that contacts the liquid in the cartridge and a second wall for engaging a piston rod that drives the piston. The first

A liquid medication delivery device for, and a method of, delivering medication from a cartridge having a moveable piston at one end is disclosed. The piston has a first wall face that contacts the liquid in the cartridge and a second wall for engaging a piston rod that drives the piston. The first and second walls are moveable but the second wall tends to move more quickly then the first during administration of a dose of medication from the cartridge. To compensate for this difference in movement between the first and second wall faces, the rod first moves a distance corresponding to the amount that the first wall face must move to deliver the desired dose and then it continues to move past this position by an amount known as an overshoot distance. It is then retracted by a distance equal to the overshoot distance. scale reference markings uniquely corresponding to a particular distance to the fixed reference point. 3. The device of claim 2 wherein the scale reference markings comprise a sequentially increasing marker series at selected intervals distributed therealong the proximal portion of the wire guide. 4. The device of claim 2 wherein the scale reference markings include a progressively increasing series of markings, each member of the series corresponding to a particular distance to the fixed reference point with each of the members being located at 5 cm increments with respect to any adjacent members of the series. 5. The device of claim 2 wherein the scale reference markings include numerical values identifying the particular distance to the fixed reference point. 6. The device of claim 5 wherein the first system of indicia further includes a plurality of intermediate markings located therebetween selected adjacent scale reference markings. 7. The device of claim 1 wherein the distal portion includes at least one radiopaque marker. 8. The device of claim 7 wherein one of the at least one radiopaque marker includes the distal tip. 9. The device of claim 1 wherein the second system of indicia includes a pluarlity of oblique markings. 10. The device of claim 1 wherein the second system of indicia comprises a series of discrete diagonal lines that at least partially circumscribe the wire guide. 11. The device of claim 10 wherein the second system of indicia comprises at least on helical stripe extending along at least a portion of the wire guide. 12. The device of claim 10 wherein the wire guide further includes an outerlayer, the outer layer including alternating first and second helical striping incorporated thereinto. 13. A medical device for measuring an anatomical structure comprising a first reference and a second reference within a body passage during a medical procedure which uses an endoscope, comprising: a wire guide that includes a distal tip, a distal portion having at least one radiopaque marker, a proximal portion and a fixed reference point, wherein the proximal portion includes at least a first system of indicia that includes a plurality of uniquely identifiable scale reference markings comprising at least two different types of markings which are at least partially viewable while the distal portion of the wire guide as viewed with the endoscope is positioned relative to the first reference of the anatomical structure to obtain a first measurement, and the plurality of uniquely identifiable scale reference markings on the proximal portion are at least partially viewable while the distal portion of the wire guide as viewed with the endoscope is positioned relative to the second reference of the anatomical structure to obtain a second measurement, to thereby measure the anatomical structure within the body passage by comparing the first measurement with the second measurement, wherein the first system of indicia comprises both the uniquely identifiable scale reference markings and a plurality of intermediate markings located between selected ones of the uniquely identifiable scale reference markings, the wire guide further including a second system of indicia comprising a pattern of markings that permit continuous monitoring of movement of the device by the operator thereof. 14. The device of claim 13 wherein the indicia sufficiently circumscribe the distal portion to assuredly be at least partially viewable within the viewing region at any angular position of the elongate member. 15. The device of claim 13 wherein the scale reference markings comprise a sequentially increasing marker series. 16. The device of claim 15 wherein the sequentially increasing marker series comprises differently numbered bands at least partially circumscribing the wire guide. 17. The device of claim 13 wherein the scale reference markings are located at 5 cm increments relative to the fixed reference point, and the intermediate marki