MEDICAL DELIVERY DEVICES HAVING LOW LUBRICANT SYRINGE BARRELS
FIG12 is a schematic illustration of a lubricant free syringe barrel in accordance with some embodiments
FIG12 illustrates a lubricant free syringe barrel 201 having an inner surface 202 and needle 203. The inner surface 202 has a surface energy and a water contact angle. It is to be appreciated that the needle 203 is exemplary in nature, as a needleless system such as a luer-lock system may alternatively be utilized. The barrel has a point 201a which is the approximate point where the stopper 204 has completely translated past its initial position in the barrel and a point 201b that is the approximate point before the front of the stopper 204 reaches the conical portion of the barrel. In a 1 ml long syringe, point 201a is 10 mm from the front end 205 of the stopper 204 and point 201b is 28 mm from the front end 205 of the stopper 204. It is to be appreciated that point 201b and point 201b can easily be determined for other syringe sizes such as, but not limited to, 0.5 ml, 1-3 ml standard, 5 ml, 10 ml, 20 ml, 50 ml, and 100 ml.
schematic
201
lubricant free syringe barrel
202
inner surface
12
P2Y Purinoceptor clause
204
stopper
36
clause
205
body
['1. A medical delivery device comprising: a barrel having an inner surface; and a stopper positioned within the barrel, the stopper contacting at least a portion of the inner surface of the barrel; the stopper having a compressibility of greater than 7.9% measured against the barrel, the stopper comprising two or more ribs; and a plunger rod or actuation mechanism to displace the stopper; wherein the inner surface of the barrel has a water contact angle between 1° and 58°, wherein the stopper comprises an elastomeric body and the stopper is at least partially covered with one or more non-fluoropolymer layers, and wherein the compressibility (C) is defined by the following formula:  C % = v − y / v × 100  where v is the maximum outer diameter of the rib(s) in a non-compressed state, and y is the inner diameter of the inner surface of the barrel.']