Mechanical volume control for injection devices
First Claim
1. A needleless fluid delivery system comprising:
- an applicator lumen;
a connector member; and
an injector assembly, the injector assembly including an adjustable volume control apparatus having a plunger shaft assembly and a stop member, the plunger shaft assembly including a shaft member and an engagement portion, the engagement portion including a plurality of engagement surfaces, said engagement surfaces being variably arranged about the shaft member with each engagement surface having differing diameters when measured about the shaft member and, wherein the stop member is positioned such that a desired amount of a stop surface is presented to contact a selected one of the engagement surfaces so as to limit a stroke length of the plunger shaft assembly, and wherein the amount of the stop surface presented is unique for contacting each of the plurality of engagement surfaces.
5 Assignments
0 Petitions
Accused Products
Abstract
A needleless fluid delivery system allowing for selective control of amounts of therapeutic fluids that are administered to treatment sites within a patient. The fluid delivery system includes an injector source and an access device. The fluid delivery system generally includes an adjustable volume control system for selectively metering the amount of therapeutic fluid to be delivered to the treatment location. The adjustable volume control system generally includes a mechanical stop system with a plunger member and a stop member, wherein the plunger member and stop member physically interact to restrict a plunger insertion length which simultaneously controls an amount of therapeutic fluid expelled by said plunger.
72 Citations
14 Claims
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1. A needleless fluid delivery system comprising:
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an applicator lumen; a connector member; and an injector assembly, the injector assembly including an adjustable volume control apparatus having a plunger shaft assembly and a stop member, the plunger shaft assembly including a shaft member and an engagement portion, the engagement portion including a plurality of engagement surfaces, said engagement surfaces being variably arranged about the shaft member with each engagement surface having differing diameters when measured about the shaft member and, wherein the stop member is positioned such that a desired amount of a stop surface is presented to contact a selected one of the engagement surfaces so as to limit a stroke length of the plunger shaft assembly, and wherein the amount of the stop surface presented is unique for contacting each of the plurality of engagement surfaces. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for adjustably controlling an amount of therapeutic fluid delivered with a needleless fluid delivery system comprising:
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providing a needleless fluid delivery system having a minimally invasive access device, a connector member and an injector assembly having a plunger shaft assembly with a plurality of engagement surfaces, said engagement surfaces being variably arranged about the plunger shaft assembly with each engagement surface having differing diameters when measured about the plunger shaft assembly; accessing a treatment location with the minimally invasive access device; adjusting a stroke length of the plunger shaft assembly by positioning a stop member such that a desired amount of a stop surface is presented to interact with a selected one of the plurality of engagement surfaces and wherein the amount of the stop surface is unique for engaging each of the plurality of engagement surfaces. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification