Needleless injection device components, systems, and methods

Abstract

A high-pressure fluid injection system, which includes a rechargeable injection chamber with a proximal end, a distal end, and an internal opening extending from the proximal end to the distal end, a plunger slideably engaged with the internal opening of the injection chamber, an injection tube extending from the distal end of the injection chamber and in fluidic communication with the internal opening of the injection chamber, and a check valve between the proximal and distal ends of the injection chamber. The internal opening includes a high-pressure zone adjacent to the check valve and having a first diameter, and a low-pressure zone proximal to the high-pressure zone and having a second diameter that is larger than the first diameter.

1 . A fluid injection system comprising:
 a shaft comprising a proximal end, a distal end, and at least one protrusion extending from an outer surface of the shaft adjacent the proximal end;   a first rotatable, stepped stop member comprising multiple step portions, wherein the first stop member is positioned concentrically around the shaft; and   a second rotatable, stepped stop member comprising multiple step portions, wherein the second stop member is positioned concentrically relative to the shaft and relative to the first stop member;   wherein the shaft is linearly translatable in a distal direction for engagement of the at least one protrusion with at least one of the step portions of at least one of the first and second stop members.   
     
     
         2 . The fluid injection system of  claim 1 , further comprising a first motor engaged with the first stop member and a second motor engaged with the second stop member. 
     
     
         3 . The fluid injection system of  claim 1 , wherein the first stop member is spaced linearly along a length of the shaft from the second stop member, wherein a first protrusion of the at least one protrusion of the shaft is engageable with the step portions of the first stop member, and wherein a second protrusion of the at least one protrusion of the shaft is engageable with the step portions of the second stop member. 
     
     
         4 . The fluid injection system of  claim 1 , wherein the second stop member is positioned at least partially within the first stop member, and wherein the first stop member further comprises an elongated groove extending from the multiple step portions toward the distal end of the shaft for engagement with at least one protrusion of the shaft. 
     
     
         5 . The fluid injection system of  claim 4 , wherein at least a portion of a length of the second stop member is positioned within a length of the first stop member. 
     
     
         6 . The fluid injection system of  claim 4 , wherein the entire second stop member is positioned within an inner area of the first stop member. 
     
     
         7 . The fluid injection system of  claim 4 , wherein the multiple step portions of the first stop member comprise multiple grooves that each have a smaller length than a length of the elongated groove. 
     
     
         8 . The fluid injection system of  claim 1 , wherein at least one of the first and second stepped stop members is manually rotatable. 
     
     
         9 . The fluid injection system of  claim 1 , wherein at least one of the first and second stepped stop members is automatically rotatable. 
     
     
         10 . The fluid injection system of  claim 9 , further comprising a motor operatively engaged with at least one of the first and second stepped stop members to provide its automatic rotation. 
     
     
         11 . The fluid injection system of  claim 1 , wherein the distal end of the shaft is in fluid communication with a channel. 
     
     
         12 . The fluid injection system of  claim 11 , wherein the distal end of the shaft is linearly moveable relative to a length of the channel. 
     
     
         13 . The fluid injection system of  claim 11 , further comprising a fluid reservoir in fluid communication with the channel. 
     
     
         14 . The fluid injection system of  claim 11 , wherein the channel comprises an outlet end. 
     
     
         15 . The fluid injection system of  claim 14 , wherein the distal end of the shaft comprises a first position in which a volume of fluid is injectable into the channel and a second position in which the at least one protrusion is engaged with at least one of the step portions of one of the first and second stop members, wherein the distal end of the shaft is linearly moveable from the first position to the second position for ejecting at least a portion of the volume of fluid from the outlet end of the channel. 
     
     
         16 . The fluid injection system of  claim 1 , wherein each of the multiple step portions comprises a flat step portion. 
     
     
         17 . The fluid injection system of  claim 1 , wherein each of the multiple step portions comprises a groove.