in inadvertent or unintentional separation of such parts the relatively flat construction also permits the use of softer or more pliable materials thus promoting greater patient comfort and ease of attachment and detachment of the cap while a variety of materials having such properties might be used a polyolefin such as low density polyethylene is believed particularly suitable the central panel 37 of the access cap may be formed of any flexible transparent plastic having adequate barrier properties and capable of being heat sealed to rim 36 for example a laminate of ethyl vinyl acetate and vinylidene chloride has been found suitable straps 45 join the closure cap to the flanged ring 27 in the embodiment shown two such straps are provided ideally the connecting straps 45 ring 27 and rim 36 are all integrally formed in the same molding operation tabs 46 and 47 project outwardly from the rim 36 and ring 27 at points generally diametrically opposite from hinge straps 45 and like the hinge straps are formed as integral parts of the rim and ring such tabs are disposed in side by side relation when the access cap is closed fig1 and provide means for gripping the parts to initiate separtion when unsealing of the cap is desired when the device is to be applied about a wound site a user first swings the access cap 35 into open position fig2 and cuts an opening in barrier panel 22 that follows the general outline of and is somewhat larger than the.