Described are methods for reversible occlusion of a body lumen by way of degradation as a result of exposure to one or more stimuli such as light. The methods include administering one or more substance(s) into a body lumen of a subject and forming a stimuli-responsive polymer mass in the body lumen from the one or more substance(s). The mass is sufficient to occlude the body lumen in a manner that prevents transport of at least one material through the body lumen and is susceptible to on-command reversal in the body lumen upon exposure to one or more stimuli. The methods include administering one or more stimuli to a polymer mass in a body lumen for a time and intensity to cause the reverse the polymer mass. The methods are particular useful for applications in which it is desirable to temporarily occlude a body lumen, such as male and female contraception.

There is provided a method for controlling a flow of sperms in a uterine tube formed by a uterine tube wall of a patient. The method comprises gently constricting (i.e., without substantially hampering the blood circulation in the uterine tube wall) at least one portion of the uterine tube wall to influence the flow of sperms in the uterine tube, and stimulating the constricted wall portion to cause contraction of the uterine tube wall portion to further influence the flow of sperms in the uterine tube. The method can be used for restricting or stopping the flow of sperms in the uterine tube, or for actively moving the fluid in the uterine tube, with a low risk of injuring the uterine tube.

There is provided a method for controlling a flow of sperms in a uterine tube formed by a uterine tube wall of a patient. The method comprises gently constricting (i.e., without substantially hampering the blood circulation in the uterine tube wall) at least one portion of the uterine tube wall to influence the flow of sperms in the uterine tube, and stimulating the constricted wall portion to cause contraction of the uterine tube wall portion to further influence the flow of sperms in the uterine tube. The method can be used for restricting or stopping the flow of sperms in the uterine tube, or for actively moving the fluid in the uterine tube, with a low risk of injuring the uterine tube.

There is provided a method for controlling a flow of eggs in a uterine tube formed by a uterine tube wall of a patient. The method comprises gently constricting (i.e., without substantially hampering the blood circulation in the uterine tube wall) at least one portion of the uterine tube wall to influence the flow of eggs in the uterine tube, and stimulating the constricted wall portion to cause contraction of the uterine tube wall portion to further influence the flow of eggs in the uterine tube. The method can be used for restricting or stopping the flow of eggs in the uterine tube, or for actively moving the fluid in the uterine tube, with a low risk of injuring the uterine tube.

There is provided a method for controlling a flow of eggs in a uterine tube formed by a uterine tube wall of a patient. The method comprises gently constricting (i.e., without substantially hampering the blood circulation in the uterine tube wall) at least one portion of the uterine tube wall to influence the flow of eggs in the uterine tube, and stimulating the constricted wall portion to cause contraction of the uterine tube wall portion to further influence the flow of eggs in the uterine tube. The method can be used for restricting or stopping the flow of eggs in the uterine tube, or for actively moving the fluid in the uterine tube, with a low risk of injuring the uterine tube.

There is provided a method for controlling a flow of eggs in a uterine tube formed by a uterine tube wall of a patient. The method comprises gently constricting (i.e., without substantially hampering the blood circulation in the uterine tube wall) at least one portion of the uterine tube wall to influence the flow of eggs in the uterine tube, and stimulating the constricted wall portion to cause contraction of the uterine tube wall portion to further influence the flow of eggs in the uterine tube. The method can be used for restricting or stopping the flow of eggs in the uterine tube, or for actively moving the fluid in the uterine tube, with a low risk of injuring the uterine tube.

There is provided a method for controlling a flow of eggs in a uterine tube formed by a uterine tube wall of a patient. The method comprises gently constricting (i.e., without substantially hampering the blood circulation in the uterine tube wall) at least one portion of the uterine tube wall to influence the flow of eggs in the uterine tube, and stimulating the constricted wall portion to cause contraction of the uterine tube wall portion to further influence the flow of eggs in the uterine tube. The method can be used for restricting or stopping the flow of eggs in the uterine tube, or for actively moving the fluid in the uterine tube, with a low risk of injuring the uterine tube.

Disclosed are methods of delivering an agent to the lumen of the vas deferens under guidance of ultrasound imaging. The methods include vas-occlusive contraception in which the vas deferens is non-surgically isolated and an occlusive substance is percutaneously administered into the lumen of the vas deferens under ultrasound. Also disclosed are methods of reversal of vas-occlusive contraception and methods of delivering an agent to the lumen of the vas deferens. Also disclosed are compositions for use in the methods of the invention.

The disclosed invention relates to a system and method for fallopian birth control that utilizes implantable devices that release botulinum toxin or similar acting substances to effectively prevent peristalses of the fallopian tube. The system includes an implantable device, a means for inserting, and an anesthetic. The implantable device is inserted through different methods and is permanent, removable, or degradable so that the process is reversable by recanalization. There is also a corresponding method for utilizing the system and method for fallopian birth control with a tactile device and a visual device.

The disclosed invention relates to a system and method for fallopian birth control that utilizes implantable devices that release botulinum toxin or similar acting substances to effectively prevent peristalses of the fallopian tube. The system includes an implantable device, a means for inserting, and an anesthetic. The implantable device is inserted through different methods and is permanent, removable, or degradable so that the process is reversable by recanalization. There is also a corresponding method for utilizing the system and method for fallopian birth control with a tactile device and a visual device.