as polyalkenes polyethylene fluorinated polyolefins polytetrafluoroethylene polyvinylidenefluoride polyamides polyurethanes polyisoprenes polystryrenes polysilicones polycarbonates polyaryletherketones polymetacrylates polyacrylates aromatic polyesters polyimides and copolymers of polymerisable substances thereof further suitable absorbable materials include polyhydroxy acids polylactides polyglycolides polyhydroybutyrates polyhydroxyvaleriates polycaprolactones polydioxanones synthetic and natural oligo and polyaminoacids polyphosphazenes polyanhydrides polyorthoesters polyphosphates polyphosphonates polyalcohols polysaccharides polyethers resorbable glasses and copolymers of polymerisable substances thereof other textile technologies incorporating non woven techniques may also be suitable another suitable material is created by assembling material or components of a product sold under the name ethisorb u00ae dura patch sold by codman amp shurtleff inc of raynham mass which is mainly a vicryl u00ae polyglactin synthetic surgical composite material that is used for tissue reinforcement surgery vicryl u00ae is a material that is also manufactured by ethicon inc ethisorb u00ae dura patch includes a fleece made from vicryl u00ae polyglactin 910 and pds poly p dioxanone undyed yarn which is sandwiched on one side with a piece of dyed poly p dioxanone film suitable film materials include an absorbable material such as monocryl u00ae poliglecaprone 25 or pds u00ae dyed or undyed poly p dioxanone film or non absorbable materials such as an elastomer the collapsible sleeve 2 preferably has a thickness of between 30 u03bcm to 500 u03bcm.