Fluid restriction mechanisms for drug delivery pumps
A replaceable fluid restriction mechanism includes: an aperture residing adjacent to a fluid pathway connection and configured to permit flow of a drug fluid through the aperture when the fluid pathway connection is open; an entry point of a fluid channel configured such that the flow of drug fluid can travel through aperture to the entry point and through the fluid channel to an exit point; and an outlet aperture of a port through which the flow of drug fluid may travel after exiting the exit point, wherein a fluid conduit is connected to the fluid restriction mechanism at the outlet aperture. A configurable fluid restriction mechanism includes a plurality of fluid channels, selectable to align with the entry point and an exit point of the fluid restriction mechanism.
1. A drug delivery pump with fluid delivery control comprising:
a housing, within which are mounted:
an activation mechanism,
an insertion mechanism configured to introduce a needle or cannula to a target,
a drug container having a plunger seal and a pierceable seal,
a drive mechanism,
a fluid pathway connection having a piercing member configured to penetrate the pierceable seal to permit fluid flow, and
a fluid restriction mechanism;
the drug container being connected at one end to a drive mechanism and at another end to a fluid pathway connection,
the fluid restriction mechanism being connected at one end to the fluid pathway connection and at the other end to a fluid conduit,
the fluid conduit being connected at another end to the insertion mechanism such that the fluid restriction mechanism is positioned to restrict or control a flow of a drug fluid from the drug container to the insertion mechanism, and
the fluid restriction mechanism comprising:
an aperture residing adjacent to the fluid pathway connection and configured to permit flow of a drug fluid through the aperture when the fluid pathway connection is open,
an entry point,
an exit point,
a fluid channel configured to permit flow of the drug fluid through the aperture to the entry point and through the fluid channel to the exit point,
an outlet aperture through which the flow of drug fluid can travel after exiting the exit point,
a vent aperture; and
a membrane at the vent aperture configured to permit air or gas to exit the fluid restriction mechanism while preventing fluid passage therethrough.
2. The drug delivery pump of claim 1 , wherein the membrane is a permeable membrane.
3. The drug delivery pump of claim 1 , wherein more than one fluid restriction mechanism is connected in series in a stacked configuration, the aperture of a first fluid restriction mechanism residing adjacent to the fluid pathway connection and configured to permit flow of the drug fluid through the aperture when the fluid pathway connection is open, the fluid conduit connected to the outlet aperture of a last fluid restriction mechanism in the stacked configuration.
4. The drug delivery pump of claim 1 , wherein the fluid restriction mechanism further comprises:
a plurality of fluid channels selectably alignable with the entry point and the exit point of the fluid restriction mechanism.
5. The drug delivery pump of claim 4 , wherein the plurality of fluid channels vary in length to provide different durations of travel for the flow of drug fluid.
6. The drug delivery pump of claim 4 , wherein the plurality of fluid channels vary in diameter to provide different fluid restrictions to the flow of drug fluid.
7. The drug delivery pump of claim 4 , wherein one or more fluid channels may be selectively opened to permit the flow of drug fluid.
8. The drug delivery pump of claim 4 , wherein one or more fluid channels may be selectively closed to prevent the flow of drug fluid.
9. The drug delivery pump of claim 4 , wherein one or more fluid channels may be connected to each other to increase the duration of travel that the drug fluid must flow through.
10. The drug delivery pump of claim 4 , wherein the fluid restriction mechanism is in the shape of a disc, a spheroid, a square, a sphere, a cube, a rectangle, or a pyramid.
11. The drug delivery pump of claim 1 , wherein the fluid restriction mechanism is a component of the fluid pathway connection mounted to and integrated within the barrel of the drug container.
12. The drug delivery pump of claim 1 , wherein the fluid restriction mechanism is a component adjacent to the fluid pathway connection and configured to restrict flow of the drug fluid from a barrel of the drug container through the drug pump once the fluid pathway connection is opened.
13. The drug delivery pump of claim 1 , wherein the fluid restriction mechanism is connected to the fluid pathway connection by a first fluid conduit, and the fluid restriction mechanism is connected to the insertion mechanism by a second fluid conduit, such that the flow of drug fluid is restricted between the drug container and the insertion mechanism by the fluid restriction mechanism.
14. The drug delivery pump of claim 1 , wherein the piercing member is configured to translate relative to the pierceable seal.