US 5,469,867 A · Cast-in place thermoplastic channel occluder

Abstract

A method of blocking channels in a mammal which channels normally carry a material from one point to another is carried out by injecting a heated flowable polymer into the channel and allowing the polymer to cool and solidify, thus creating a plug or channel occluder. The plug can be later removed physically in its solid form or removed gradually by softening and/or fluidizing it by heating and/or chemical means. The channel occluder is preferably comprised of a main chain or side-chain crystallizable polymer but may be comprised of other polymers provided the polymers are formulated to have certain characteristics. The polymers must be solid and/or non-flowable at body temperature or lower and flowable when heated slightly above body temperature, i.e., 10 centigrade degrees or less above body temperature. The polymer is capable of changing quickly from a flowable state to a non-flowable state by moving through only a few centigrade degrees of temperature and is a non-immunogenic, biocompatible material. Typical channels which may be reversibly occluded via the present invention include the vas deferens, the mature sperm excretory channel of the testis; the fallopian tube or oviduct, the viaduct conveying the ovum from the ovary to the uterus; the canaliculus lacrimalis, the passageway that allows excess tears to flow from the puncta of the eye to the lacrimal sac; and the cavity of the femoral shaft to fix the stem of replacement hip joint (ball and neck).

Claims44

Dependent claims

A method of occluding a channel in a living mammal, said channel having a maximum temperature Y.sub.L in the living mammal, the method comprising

(1) providing a thermoplastic, biocompatible, non-immunogenic occluding composition which
(a) is non-flowable at T.sub.L,
(b) becomes flowable when heated to a temperature which does not damage the channel, and
(c) comprises a thermoplastic polymer;
(2) heating the composition to a temperature at which it is flowable;
(3) placing the heated composition in the channel while the composition is flowable and is at a temperature which does not damage the channel;
and
(4) allowing the composition to cool and become a thermoplastic non-flowable occluder in the channel;
said non-flowable occluder being removable from the channel by a process which comprises heating the occluder to a temperature above T.sub.L at which the composition is flowable and which does not damage the channel.

6 more elements

Dependencies are inferred from the claim text.

Cast-in place thermoplastic channel occluder

Life of this patent

Cast-in place thermoplastic channel occluder

Life of this patent

Abstract

Claims44