A dispensing system includes a housing and a refill container carrying a dispensable material and received in the housing. The baffle member includes a generally helical or spiral shaped portion. In a preferred arrangement, the two strings of opposed parallel coupled diodes are used with different numbers of diodes in each string. For example, various embodiments of polymers are provided that comprise a relatively rigid backbone that is suitable for noncovalently bonding with a carbon nanotube substantially along the nanotube’s length, as opposed to about its diameter. A portion of the lead body is disposed within the internal lumen and side apertures through the opening in the proximal end of the electrode body.