A low horsepower transmission is disclosed. In some embodiments, a catheter having a penetrator is advanced into the body lumen and the penetrator is then advanced from the catheter toward a target location outside of that body lumen. The power supply member is disposed at the second end side of the heating roller. The first terminals of the first and second motor coils are commonly connected to a power source. Also, the liquid crystal molecules forming the liquid crystal layer include a liquid crystal molecule having a positive dielectric anisotropy and a liquid crystal molecule having a negative dielectric anisotropy.