摘要:
Osmotically driven active agent dispenser for use in an aqueous environment that pumps a solution of active agent, such as a drug, at a predetermined, constant rate. The dispenser is in the form of a coated tablet comprising: a core of an osmotically effective active agent composition; and an inexpandable wall that encloses the core, has a controlled permeability to water and includes means, such as brittleness or sites of structural weakness, that is responsive to the pressure generated within the dispenser by imbibition of water from the environment by the core through the wall to form at least one, and usually many, passageways in situ in the wall through which the active agent composition in solution is pumped osmotically at a rate that is substantially dependent of the rate at which water is being imbibed into the dispenser.
摘要:
A fluid delivery device, comprising an electrochemical pump, wherein the pump is capable of transporting water; a pump product chamber, wherein the pump product chamber is capable of retaining water generated from the pump; a displaceable member positioned between the pump product chamber and a reservoir, wherein the displaceable member is controllably displaced upon generation of water from the electrochemical pump; a reservoir, wherein the reservoir is capable of containing a fluid which is delivered upon displacement of the displaceable member; and an housing for containing the pump, the pump product chamber, the displaceable member, and the reservoir.
摘要:
The invention provides a local concentration management system (LCMS) for delivery of highly concentrated therapeutic agent formulations. The LCMS comprises a device comprising an elongate body defining a lumen between its proximal and distal ends, and a diffuser element, a dilutor element, or both. The diffuser element, which is selectively permeable to the agent, is operatively associated with the elongate body so that agent flows through the elongate body, and into and through the diffuser element to exit the system. The dilutor element can be operatively associated with the system to be in fluid communication with the elongate body lumen, a diffusion space defined by a diffuser element inner wall, or both. The dilutor element is selectively water permeable, but substantially impermeable to agent, to provide for dilution of the agent during transit through the system. The LCMS system is designed to disperse and/or dilute the drug delivery stream.
摘要:
The present invention is disclosed herein as an electrochemical cell having a cell housing with a first half cell and a second half cell, and an ion selective membrane between the cells. The electrochemical cell further has a first electrode positioned within the first half cell, a second electrode positioned within the second half cell, an electrolyte in electrical communication with both the first electrode and the second electrode. The electrodes of the cell are configured so that the electrochemical cell maintains a substantially constant salt concentration level throughout operation. The cell is preferably used in conjunction with an implantable fluid delivery apparatus. A method for using the device is additionally disclosed.
摘要:
An agent delivery or sampling device (2) comprising a member (6) having a plurality of blades (4) for piercing the skin and a connecting medium (65) covering at least a part of the skin contacting side (48) of the member (6) for increasing transdermal flux of an agent.
摘要:
An electro-osmotic cell capable of substantially reducing zero-current transport is disclosed, wherein the cell includes a cell housing having a first half cell and a second half cell, with an ion selective membrane therebetween, a first electrode positioned within the first half cell, a second electrode positioned within the second half cell, an electrolyte in electrical communication with the first electrode and the second electrode, and a wiring apparatus electrically connecting the first electrode and the second electrode, wherein the wiring apparatus has one or more structures used for counteracting salt concentration increases within the electro-osmotic cell. Such a cell may be used within an electro-osmotic fluid delivery device, along with a fluid inlet, a piston member adjacent the electro osmotic cell, and a drug reservoir adjacent the piston member, wherein the drug reservoir includes a sealed compartment having an exit port. A method for using such a device is similarly disclosed.
摘要:
An electro-osmotic cell capable of substantially reducing zero-current transport is disclosed, wherein the cell includes a cell housing having a first half cell and a second half cell, with an ion selective membrane therebetween, a first electrode positioned within the first half cell, a second electrode positioned within the second half cell, an electrolyte in electrical communication with the first electrode and the second electrode, and a wiring apparatus electrically connecting the first electrode and the second electrode, wherein the wiring apparatus has one or more structures used for counteracting salt concentration increases within the electro-osmotic cell. Such a cell may be used within an electro-osmotic fluid delivery device, along with a fluid inlet, a piston member adjacent the electro osmotic cell, and a drug reservoir adjacent the piston member, wherein the drug reservoir includes a sealed compartment having an exit port. A method for using such a device is similarly disclosed.
摘要:
An osmotic delivery system having a space efficient piston. The capsule has an interior holding the piston, a beneficial agent, and an osmotic agent. The piston is movable with respect to an interior surface of the capsule, and defines a movable seal with the interior surface of the capsule. The moveable seal separates the osmotic agent from the beneficial agent. The piston has a recess that receives at least a portion of the osmotic agent. The osmotic agent imbibes liquid from a surrounding environment through a semipermeable body to cause the piston to move and in turn cause delivery of the beneficial agent from the capsule.
摘要:
The present invention features a composite catheter comprising an elongate outer member and an elongate inner member positioned within the outer member so that the inner and outer members define an interstitial space. The outer member has a size and other characteristics that facilitate handling and implantation of the composite catheter, while the inner diameter of the inner member has the size and other characteristics suitable for delivery of a drug through a lumen of the inner member. The interstitial space imparts flexibility to the composite catheter by, for example, removing material from the cross-sectional area that would otherwise provide additional stiffness to the catheter, and/or by accommodating movement of the outer member relative to the inner member.