Explanation: The implants should be environment-friendly and should not breakdown under the influence of heat, light, air or moisture. It should be biostable, biocompatible, non-toxic and non-carcinogenic. It should be removable when required. It should be able to release medication at a constant predetermined rate.

Explanation: The advantages of implants are these are more effective, have prolonged action, and a small dose is sufficient for the patient. The major disadvantage of such systems is that microsurgery is required for the implantation device. Although some implants can be implanted by specially designed implant syringe.

Explanation: Due to a very easy access for the implants the subcutaneous tissue became an ideal location for implanting. Moreover it has poor perfusion, slow drug absorption and less reactivity to many of the foreign materials. The system is generally prepared as implantable flexible or rigid rods or spherical tablets. Polymers used for making such implants are polymethacrylates, elastomers, etc.

Explanation: Drugs which are generally used for such implants are steroids like contraceptives, morphine antagonists like naltrexone for opioid-dependent addicts. Polymers used for making such implants are polymethacrylates, elastomers, etc. The system is generally prepared as implantable flexible or rigid rods or spherical tablets.

Explanation: The disc-shaped device consists of two chambers. The infuscate chamber consists if the drug solution which will be separated by a freely movable flexible bellow from the vapor chamber containing vaporizable fluids. The volatile liquid vaporizes at body temperature after implantation thus creating vapour pressure which compresses and expels the drug through a series of flow regulators.

Explanation: After implantation, the volatile liquid vaporizes at the body temperature and creates a vapor pressure that compresses and expels the drug through a series of flow regulators at a constant rate. Insulin and morphine have been successfully delivered by such implants. The disc-shaped device consists of two chambers. The infuscate chamber consists if the drug solution which will be separated by a freely movable flexible bellow from the vapor chamber containing vaporizable fluids.

Explanation: Battery powered pumps are such that they are programmed to release drugs of a certain amount when the range of those components is differing from the normal value. Their design is such that the drug moves towards the exit and there is no backflow of the liquid. They are of two types these are peristaltic pump and solenoid driven reciprocating pump.

Explanation: No the cells have to be immersed in a hypotonic solution. The cells must be immersed in a buffered hypotonic solution of drug which causes these cells to rupture and release hemoglobin and trap the medication. The restoration can be done by the restoration of the isotonicity and incubating them at 37°C, the cells reseal and are ready to use.

Explanation: MLV are also known as multilamellar vesicles. These liposomes are made of series of concentric bilayers of lipids enclosing a small internal volume. 2-10 bilayers are lipid is used to make OLV. A single bilayer of lipid is used to make ULV.

Explanation: OLV is also known as oligolamellar vesicles. These are made up of 2-10 bilayers of lipid surrounding a large internal volume which will be consisting of the drug. MLV is made up of a series of concentric bilayers of lipids. ULV is made of a single layer of lipids. There can be varying sizes from 20-40 nm to 1000 nm.