fabrication of catheter introducers , being quite common in the field of medical apparatus and delivery systems , need not be addressed herein as to size and materials . locations of infection or contamination to be avoided are suitably defined in the two incorporated references and are acknowledged insofar as explanation of my invention requires . referring now to fig1 the invention 10 is defined by an essentially tubular body 12 having a conductive lumen or passage 14 therethrough which is receptive of a catheter 16 , here of the urethra / bladder class . the body 12 is separable into distal 18 and proximal 20 portions , not necessarily for manufacturing purposes , but rather for elucidation or pedagogic reasons . those skilled in manufacture of the aforesaid systems may realize the invention in different modalities consistent with my teaching and distinctive improvements to the art . the first noteworthy distinction is a chamber 22 disposed coaxially with the passage 14 , but of slightly greater diameter . this chamber , the purpose of which is to act as a repository / vault for a membranous , tubular shroud 24 , need not be of any particular size or shape since its geometry is predicated more on size , length and stowability of the shroud 24 , alternately termed an envelope . in the preferred embodiment , the chamber 22 is shaped to receive a partially open , hollow annulus / toroid called a holder 26 ; which holder secures an end of the shroud 24 . the other end of the shroud 24 is passed out of the distal opening 28 and drawn convolutionally over the distal portion 18 in an enveloping fashion . in fig1 the hem 25 of the shroud 24 is secured peripherally to an annular collar 30 which is new in this form of apparatus in that is is constructed to translate from a first position d ( distal ) to a second position p ( proximal ) and , in doing so , draw the shroud 24 out of passage 14 . thus , it may be seen , that as the distal tip of the invention 10 body is inserted into the urethral orifice 32 of the male m or female f organ , the extreme shoulder of the orifice will press against the collar 30 and urge it proximally toward position p as the distal orifice 28 moves in relatively the opposite direction into the urethra 33 . the proximal translation of the shroud hem 25 , cojoined to the collar 30 , extracts the shroud concommitantly with movement of the distal portion 18 into the urethra 33 , thus ensuring that : ( 1 ) liquid matter being presented at the distal opening 28 is urged radially away therefrom ; and , ( 2 ) urethral walls are &# 34 ; carpeted &# 34 ; by the shroud 24 . every portion of the shroud that is extracted toward the proximal position p remains relatively static with respect to the uretral walls because the relatively opposite motion of the distal portion 18 . this &# 34 ; carpeting &# 34 ; of urethral walls assures presence of a contaminant - impervious barrier between the urethral situs of contamination and the inserter &# 39 ; s distal portion that is disposed within the urethra . extraction of the shroud is caused by physical motion of its hem , which is retrograde with respect to inserter deposition , making the concept herein presented applicable to other introduction mechanisms . once the introducer is deposited , the catheter 16 may be introduced with other features of my invention becoming operatively apparent as disclosed in the remaining drawings . in fig2 a sectional detail of juncture j of distal portion 18 and proximal portion 20 , reveals the chamber 22 in which a shroud holder 26 is disposed . the shroud 24 is seen extending to the left , in the detail , while its right side is both deposited into the holder and its closed end disposed over the central hole of the annular holder . the shroud right end forms a diaphram 34 which is pierced upon insertion therethrough of the catheter . use of an optional diaphram at the proximal opening of the introducer 10 ( not shown ) ensures a portionwise or compartmental sterility of the overall apparatus . sterile lubricant 36 , common to the apparatus genre is afforded at several points , as shown herein , to enhance extraction of the shroud . fig3 depicts a shroud 24 deposition in the chamber proper , but without the holder . in lieu of the holder , another form of annulus / toroid , a ring 38 , serves as a frame for the closed end of the shroud . this end covers the hole in the ring forming the same type of diaphram 34 as seen in fig2 . in this alternate posturing of the shroud and ring 38 frame , lubricant 36 is positioned over the diaphram 34 and aids catheter movement beyond the juncture j and through the passage 14 . the detail taken at 4 of fig1 is presented as fig4 . here , the distal opening shown in this sectional view is afforded a sterile lubricant plug 40 and the collar 30 is seen affixed to the hem 25 of the shroud . projecting from the collar 30 are lobes 31 . the latter feature is optional since the user of my invention can digitally manipulate the hem 25 via the collar 30 ; but lobes 31 , or similar elements can enhance shroud extraction by their use as shown in fig1 . this duality of feature / function is further clarified in fig5 which illustrates a shroud 24 adapted with a lobed 36 collar 30 at one end ( open ) and a ring 38 - framed diaphram 34 at its other ( closed ) end . the diaphram 34 is scored 35 , but not perforated , for ease of catheter passage . at a portion , 8 -- 8 , the shroud is afforded ribbing / corrugation 42 , the function of which is described with fig8 . final to fig5 the detent ( s ) 33 , projecting radially inward of the collar 30 , are shown . this optional item is made to engage a longitudinal groove of the introducer body 12 , as seen in fig7 and discussed therewith . fig6 is an abbreviated version of the fig3 device ; the distinction being that the shroud is stowed by overlapping . the diaphram ( 34 ) remains optional , the ring 38 affording either framing / mounting therefore , or simply an anchor for an open ( hem ) ended shroud . a departure from the aforementioned repository / vault / chamber 22 is displayed in fig7 . although generically the same regarding the shoud &# 39 ; s disposition , no intermediate chamber of bulbous shape is used . instead , the proximal portion 20 has an extention 44 , but with a smaller outer diameter . a cylindrical chamber 22 &# 39 ; is formed between proximal extention &# 39 ; s 20 / 44 outer diameter ( o . d .) and distal portion 18 inner diameter . the shroud is placed therein , being principally disposed about the 20 / 44 o . d . when manufactured and prior to final assembly . a singular collar detent 33 is shown disposed in groove 46 of the body 12 . when lobes 31 are employed , use of the detent - in - groove 33 , 46 precludes twisting of the extracted shroud . finally , there is depicted in fig8 the detail taken at 8 -- 8 of fig5 . the ribs or corrugations 42 of the shroud 24 are integral with the shroud and arranged circumferentially transverse to its length . by their design , when extracted and repositioned outside the body 12 , as depicted in phantom detail 50 , they urge mucosa away from distal opening 28 and preclude seepage back toward it by capturing such liquids between the shroud 22 and the urethral walls . also , their inherent relief serves to constrict the distal opening , thereby rendering unnecessary the use of distal plug 40 . having presented the invention with alternates and adjuncts useful to medical practitioners , i commend its usage to them consistent with the hereinafter appended claims . many options and differently formed assemblies may be created without departing from the claims or the spirit of the invention .
a sterile envelope - dispensing catheter introducer . a tubular introducer , through which a catheter is passed , dispenses a membranous shroud , or envelope , from within and out a distal opening thereof . the shroud is withdrawn by manipulation or by the urging of a body organ pressing against a shroud entrainment device . interposition of the convolutionally rearward transported shroud over the introducer &# 39 ; s distal portion assures a sterile catheter passage through the introducer and into the organ .