Anastomotic device
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation-in-part of application Ser. No. 07/735,950, filed Jul. 25, 1991, now U.S. Pat. No. 5,123,908, which is a continuation-in-part of application Ser. No. 07/629,608, filed Dec. 18, 1990, now U.S. Pat. No. 5,089,008, which is a continuation-in-part of application Ser. No. 07/472,209, filed Jan. 26, 1990, now U.S. Pat. No. 4,997,439, which, in turn, is a continuation-in-part of application Ser. No. 07/303,326, filed Jan. 26, 1989, now U.S. Pat. No. 4,930,502. 
    
    
     TECHNICAL FIELD 
     The present invention relates to the surgical joining of tubular structures and especially in the gastro-intestinal system after resection. 
     BACKGROUND OF THE INVENTION 
     The use of anastomotic devices for clamping and suturing is well known in the medical art. See, for instance, U.S. Pat. Nos. 2,638,901 (Sugarbaker); 3,254,650 (Collito); 4,233,981 (Schomacher); 4,294,255 (Geroc); 4,523,592 (Daniel); 4,657,019 (Walsh et al.); 4,693,249 (Schenck et al.); 4,747,407 (Liu et al.); and 4,757,407 (Liv et al.). 
     These and other patents are discussed in the referenced parent application files, the disclosures of which applications are incorporated herein by reference. 
     Prior art devices of the type are not fully satisfactory for at least some of the reasons that: 
     the device comprises a clamping means that requires a relatively large contact area with the tissue or body structure; 
     the device requires eversion of, and clamping pressure on, the anastomosed parts that may be causative of necrosis or at least result in severely diminished blood flow and a prolonged period for healing; 
     the device is of undue size and weight; 
     the device is awkward to use, in contradistinction to efficient surgical procedure; and 
     the device is relatively sophisticated with respect to manufacture and use. 
     An anastomotic device that is particularly directed to surgical joining of the intestine is the VATRAC® Bar produced by the Davis &amp; Geck Medical Device Division of the American Cyanamid Company. This device is relatively large, requires sophisticated handling, partial eversion of the intestinal parts and clamping thereof. 
     SUMMARY OF THE INVENTION 
     The present invention is directed to an improved surgical device that is especially useful for intestinal joinder and is: mechanically simple and inexpensive to manufacture; easy to use to thus facilitate efficient surgical procedure; provides for minimal device-to-body structure area of contact; does not require eversion or clamping of the lumen walls; provides a telescopic-friction-interlock of annular parts which results in a simplified structure of reduced mass and which parts are each provided with spaced retaining pins that are each adapted to effect anastomosis by impaling a respective first lumen wall, extend therethrough in the general luminal axis direction and subsequently impale an opposed lumen wall to effect surgical joinder and the device is disposed within the lumen. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a perspective view of the outer annulus of the device. 
     FIG. 2 is a perspective of the inner annulus. 
     FIG. 3 is a sectional, elevational view of the device in operative association of its parts and functional with respect to anastomosed structure shown in broken lines, parts of retaining pins being omitted for clarity. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Referring to the drawings which illustrate a preferred embodiment of the invention and wherein like numerals indicate like elements of structure, there is shown in FIG. 2 an annular member 10 having an outer wall portion 12 of diminished thickness and a series of spaced retaining pins 14 that each project outwardly at about 10° from the outer end portion of wall section 16 of said outer wall and extend to beyond the shoulder 18 that terminates the diminished wall portion 12. 
     FIG. 1 discloses an annular member 20 having an inner wall 22, an outer wall 24, and an end wall 26. 
     As shown in FIG. 3, the wall portion 12 is dimensioned to be telescopically received and frictionally locked in annulus 20, with said end wall 26 abutting shoulder 18 and the outer surfaces 16, 24 presenting in effect a continuous wall of generally uniform diameter; but for said retaining pins 14, and corresponding pins 28 that are integral with annulus 20, project outwardly at about 10° from an end section of wall 24 and extend beyond the transverse plane of mating of said end wall 26 and shoulder 18. 
     FIG. 3 discloses the novel and improved device in functional relationship with anastomosed lumens 30, 32 (shown in broken lines), whose intima are opposed and aligned. For purposes of clarity, not all retainer pin structure is disclosed, and the parts are dimensionally exaggerated. 
     In use, the annuli are arranged for operative association so that the axially opposed retaining pins are in alternate relationship with one another, and a separate annulus of the device, at its non-piercing end, is inserted into a respective one of the lumens until the pins reach the desired point of impalement entry. The respective lumen is then retracted to effect impalement on the associated retaining pins to the extent that each lumen wall end associates and aligns with its respective end wall 18 or 26. As shown, the retaining pins lie within the respective lumen walls except for end portions which extend through the respective ends of the lumen walls and are adapted to extend into and within the opposed lumen wall. The annuli are then telescopically joined whereby to be frictionally locked and the free ends of the retaining pins entered into the opposed lumen. Means may be provided to either visually or mechanically effect such alternate disposition of the retaining pins. 
     The retaining pins may vary in configuration with a view to lumen size and to enhancing lumen retention, and the number of pins utilized may vary in accordance with specific need. 
     The materials of fabrication are flexible, compatible with that of the human body, biodegradable and biofragmentable and may be treated or coated in order to control the time of material dissolution and fragmentation, as is known in the art. However, dissolution is not a problem since the device is primarily disposed within the intestinal tract and will be naturally eliminated. 
     The anastomotic embodiment of the invention described and illustrated is of relatively small mass, simplistic in structure and mechanical association, is significantly of minimal radial extension and, in use, requires no lumen wall eversion or distortion. 
     The embodiment shown and described is only illustrative of the present invention and is not to be construed as delimitive thereof, since once appraised of the invention, changes in structure would be readily apparent to one skilled in the art. Hence, the present invention includes all modifications of the structure encompassed within the spirit and scope of the following claims.