The rod has a length greater than the tubular sheath and a diameter substantially the same as the first diameter of the sheath.
The inner cladding diameter is preferably 125 µm to 350 µm; the outer cladding diameter is preferably 145µm to 500 µm.
The sleeve has a diameter greater than the diameter of the yoke windings.
The largest outer diameter of the flared end of the catheter is slightly larger than the smallest diameter of the package at the protrusions.
For example, the diameter of the sheathed housing the electrodes during penetration may be only 5.5 mm.
The sheath has a diameter of less than 1.6 mm and is introduced through an abdominal incision.
A mechanical lock at the distal end of the sheath permits the control member to be selectively constrained from rotation and thus lock the sheath diameter in place.
The difference between the maximum refractive index of the core and that of the cladding is Δn and the diameter of the optical cladding is 50-100 micrometers.
An arrangement of air holes is configured to define the inner, waveguiding cladding so that an NA of the latter varies between about 0.25 - 0.9 allowing this to reduce the diameter of the inner cladding.