Nozzle assembly for injection device
First Claim
Patent Images
1. A nozzle assembly adapted for use with an injector device comprising:
- a chamber for holding a fluid and having first and second ends with an orifice at the first end for passage of the fluid and being open at the second end;
a plunger movably received in said chamber for expelling fluid out of or drawing fluid into the chamber by moving the plunger relative to the chamber, the plunger comprising first and second driving members operatively connected to each other for expelling out and drawing in fluid, with the first driving member being spaced apart from the second driving member by a preselected gap; and
a resilient biasing member disposed between the first and second driving members for resiliently maintaining said gap.
2 Assignments
0 Petitions
Accused Products
Abstract
A nozzle assembly adapted for a fluid injector having a ram, includes a plunger assembly having first and second driving members. The first and second driving members are apart according to a predetermined first distance. The second driving member is spaced apart from the ram according to a predetermined second distance. The first and second distances are resiliently maintained by a resilient spring member operatively disposed between the two driving members. One of the first and second distances is selected to be the smallest and thereby controls the maximum pressure at which fluid is expelled from the nozzle assembly.
-
Citations
21 Claims
-
1. A nozzle assembly adapted for use with an injector device comprising:
-
a chamber for holding a fluid and having first and second ends with an orifice at the first end for passage of the fluid and being open at the second end; a plunger movably received in said chamber for expelling fluid out of or drawing fluid into the chamber by moving the plunger relative to the chamber, the plunger comprising first and second driving members operatively connected to each other for expelling out and drawing in fluid, with the first driving member being spaced apart from the second driving member by a preselected gap; and a resilient biasing member disposed between the first and second driving members for resiliently maintaining said gap. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A nozzle assembly adapted for a needleless hypodermic fluid injector having a ram and a nozzle member defining a blind bore and at least one orifice communicating with said bore, said nozzle assembly comprising;
-
a plunger assembly adapted to be movably positioned within said bore, said bore and movable plunger assembly collectively defining a variable-volume fluid chamber communicating with said orifice, said plunger assembly adapted to be selectively movable by the ram between a first position at which the fluid chamber has a minimum volume, a second position at which the fluid chamber has a maximum volume, and an intermediate position at which the fluid chamber has an intermediate volume smaller than the maximum volume and greater than the minimum volume; and a resilient spring having a preselected preload, said spring operative for maintaining a free travel distance between the ram and the plunger assembly when a force sufficient to move the plunger assembly but less than said preload is applied to the plunger assembly. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
-
-
21. A needleless hypodermic fluid injector having a moveable ram, comprising:
-
an injector body; a nozzle member removably connected to the injector body, said nozzle member defining a blind bore and at least one orifice communicating with said bore; a movable plunger assembly positioned within said bore, said bore and plunger assembly collectively defining a variable-volume fluid chamber communicating with said orifice, said plunger assembly being selectively movable by the ram between a first position at which the fluid chamber has a minimum volume, a second position at which the fluid chamber has a maximum volume, and an intermediate position at which the fluid chamber has an intermediate volume smaller than the maximum volume and greater than the minimum volume; and a resilient spring having a preselected preload and being operative for maintaining a free travel distance between the ram and the plunger assembly when a force sufficient to move the plunger assembly but less than said preload is applied to the plunger assembly.
-
Specification