referring to the drawings and more particularly to fig1 , a drain catheter in accordance with the present disclosure is generally shown at 10 . the drain catheter 10 is used for the drainage of bodily fluids from body cavities . for instance , the drain catheter 10 may be used for the drainage of fluid from cavities within the mediastinum , for instance after cardiac surgery . hence , the drain catheter 10 has a proximal end located outside the body , and a distal end within the body , with the longitudinal body of the drain catheter 10 within a body vessel . the drain catheter 10 has a main proximal drain tube 11 , a tube interface 12 and two or more distal drain tubes 13 . for clarity purposes , the main proximal drain tube 11 is relatively short in fig1 ( e . g ., fragmented ), but may have a substantial length relative to its outer diameter , to extend out of the body . moreover , the length of the main proximal drain tube 11 may be substantially greater than the length of each distal drain tube 13 . the tube interface 12 may be in or out of the body while the distal drain tubes 13 are mostly , if not fully , within the body . the end of the main proximal drain tube 11 located outside the body at end p is configured to be connected to any suitable suction source , fluid collection system , drainage device or accessory , while the free ends of the distal drain tubes 13 at end d of the drain catheter 10 are distributed at various locations of a body cavity to drain . various types of connectors may be located at the proximal end p of the main proximal drain tube 11 . any appropriate medical grade material may be used for the main proximal drain tube 11 . for instance , a silicone such as silastic ® of rx type may be used , with the hardness being selected as a function of the contemplated use , to sustain suction pressures in the range of 20 cm h 2 o without collapsing . the tube interface 12 is inserted into a distal - most end of the main proximal drain tube 11 . the tube interface 12 is the interface between the main proximal drain tube 11 and the plurality of distal drain tubes 13 . the tube interface 12 is connected to the main proximal drain tube 11 . the tube interface 12 may be sealingly connected to the main proximal drain tube 11 , so as to minimize pressure lost at the junction between the tube interface 12 and the main proximal drain tube 11 . the tube interface 12 is described in further details hereinafter . still referring to fig1 , there is illustrated three of the distal drain tubes 13 . the drain catheter 10 has two or more of the distal drain tubes 13 . the amount of distal drain tubes 13 is limited by the minimal dimensions of the distal drain tubes 13 : i . e ., depending on the application , a minimal diameter is required for the distal drain tubes 13 to operate efficiently . according to an embodiment , each of the distal drain tubes 13 is a multi - lumen catheter tube having longitudinal channels 13 a extending the full length of the distal drain tube 13 to maximize the amount of fluid captured by the drain tubes 13 , with a central cross - shaped core 13 b extending along the distal drain tubes 13 to provide structural integrity to the distal drain tubes 13 , and to support the elongated peripheral wall portions 13 c forming the outer periphery of the distal drain tubes 13 . the assembly of the central cross - shaped core 13 b and the elongated peripheral wall portions 13 c defines conduits within the drain tube 13 . for instance , the distal drain tubes 13 may be similar to the flexible drain portion described in u . s . pat . no . 4 , 398 , 910 , granted to blake et al . on aug . 16 , 1983 . other distal drain tube configurations are considered as well , with more or fewer of the longitudinal channels 13 a . for instance , perforated tubes and like other tubes may be used . to minimize any pain sustained by the patient , the distal drain tubes 13 are made of a flexible and resilient material , such as silicone . referring to fig1 , the tube interface 12 is shown having a cylindrical body 20 shaped to fill the interstitial space between the inner diameter of the proximal drain tube 11 and the outer diameters of the distal drain tubes 13 , in a generally airtight arrangement . referring to fig2 , the cylindrical body 20 may consist of a plurality of cylindrical body portions 20 a , 20 b and 20 c . the number of body portions is generally equivalent to the number of distal drain tubes 13 . for instance , if the drain catheter 10 has two distal drain tubes 13 , the tube interface 12 has two cylindrical body portions concurrently forming the cylindrical body 20 . an outer diameter 21 of the cylindrical body 20 is sized so as to be received in the distal - most end of the main proximal drain tube 11 . any appropriate type of interconnection between the tube interface 12 and the main proximal drain tube 11 is considered , such as a deformation fit , with or without the use of adhesives , etc . referring to fig1 and 2 , the cylindrical body 20 has canals 22 that will each receive a distal drain tube 13 . accordingly , the cylindrical body 20 has the same number of canals 22 as of distal drain tubes 13 . in another embodiment , the canals 22 converge to a single canal at a proximal end of the tube interface 12 . an inner diameter 23 ( i . e ., lumen ) of each of the canals 22 is sized to accommodate a proximal - most end of the distal drain tubes 13 , with the distal drain tubes 13 extend freely beyond the tube interface 12 . the assembly of the distal drain tubes 13 to the tube interface 12 , and of the tube interface 12 to the main proximal drain tube 11 is strong enough that these components remain connected to each other when the drain catheter 10 is pulled out of the body , despite frictional forces of the drain catheter with surrounding bodily tissue . the cylindrical body 20 is made of a medical grade material . according to an embodiment , the cylindrical body 20 is made from silicone , with a non - negligible level of resiliency . one type of silicone that may be used is silastic ® of rx type . in an embodiment , it is considered to use the same material for the distal drain tube 13 , although differing materials may be used as well . according to an embodiment , the cylindrical body 20 has a greater rigidity than the distal drain tubes 13 . with reference to fig2 , the cylindrical body portions 20 a , 20 b and 20 c are assembled onto the proximal - most ends of the distal drain tubes 13 . this ensures that the peripheral material of the canals 22 properly covers the ends of the distal drain tubes 13 and therefore produces a generally fluid - tight joint . in assembling the distal drain tubes 13 to the tube interface 12 , the length of the distal drain tubes 13 is adjusted by the user . the assembly of the cylindrical body portions 20 a , 20 b and 20 c capturing the ends of the distal drain tubes 13 may then be inserted in the main proximal drain tube 11 , using any appropriate type of manufacturing . for instance , the main proximal drain tube 11 may be resiliently deformed to insert the assembly therein . referring to fig3 , an alternative embodiment of the tube interface 12 is shown , with the cylindrical body 20 having slits 25 in communication with each of the canals 22 . in an embodiment , the slits 25 extend the full length of the canals 22 . in the natural state of the cylindrical body 20 , the slits 25 are closed by the resilience of the material of the cylindrical body 20 . the slits 25 may however be manually opened for the insertion therein of the distal drain tubes 13 . once the distal drain tubes 13 are inserted in the tube interface 12 ( with an appropriate length of the tubes 13 extending beyond the interface 12 ), the assembly may be inserted in the distal - most end of the main proximal drain tube 11 . it is observed that total frictional forces per volume of fluid are relatively lower for fluids circulating in the main proximal drain tube 11 with its single lumen , over the frictional forces for fluids in the plurality of distal drain tubes 13 . hence , the drain catheter 10 benefits from the lower frictional forces of the main proximal drain tube 11 for a substantial portion of the overall length of the drain catheter 10 . therefore , instead of having a plurality of tubes extending from an exterior of the body to the drained cavity , the use of a single proximal drain tube of greater lumenal dimensions connected to a plurality of distal drain tubes of smaller lumenal dimensions enhances the drainage of fluid . moreover , by using distal drain tubes 13 having longitudinal grooves 13 a extending proximally to the tube interface 12 and to the main proximal tube 11 , as in fig1 , the distal drain tubes 13 expose substantial drainage area to drain fluids from the bodily cavities . this may reduce the risk of clogging the various tubes . it is observed that the drain catheter 10 has a circular cross - sectional area . however , the drain catheter 10 may have any appropriate cross - sectional shapes ( oval , etc ), depending on the use of the drain catheter 10 . referring to fig4 and 5a - 5e , the drain catheter is shown at 10 ′ in accordance with another embodiment of the present disclosure . the drain catheter 10 ′ is similar to the drain catheter 10 shown in fig1 - 3 , whereby like elements will bear like reference numerals . one difference between the drain catheters 10 and 10 ′ is the interface portion 12 ′ of the catheter 10 ′ between the main proximal tube 11 and the distal drain tubes 13 . more specifically , referring concurrently to fig4 and 5e , it is observed that the drain catheter 10 ′ has the main proximal tube 11 with a circular cross - section ( although other section shapes are considered ). the circular cross - section is well suited for the connected of the main proximal tube 11 to a suction source . the distal drain tubes 13 have the longitudinal channels 13 a , the central cross - shaped cores 13 b , and the resulting conduits extending along the drain tubes 13 . the drain catheter 10 ′ is a single integral molded piece that may have an edgeless outer surface , with the interface portion 12 ′ being the transition between the circular shape of the main proximal tube to the specific shape of the distal drain tubes 13 as shown in fig5 e . hence , as shown in fig5 a , the interface portion 12 ′ has three lobes 40 . the number of lobes is in accordance with the number of distal drain tubes 13 . as shown in fig5 b , the interface portion 12 ′ transitions from the three - lobe configuration of fig5 a , to a configuration of three conduits 41 of circular inner diameter . as shown in fig5 c , the three interconnected conduits 41 of fig5 b detach to form three individual tubes 42 , having a diameter generally corresponding to that of the distal drain tubes 13 . then , sequentially to fig5 d , the tubes 42 of fig5 c feature the central cross - shaped core 13 b , but without the longitudinal channels 13 a , to then reach the configuration of fig5 e . in fig5 a to 5e , dimensions are provided as an example . these dimensions can be increased or reduced , proportionally to the outer diameter of the main proximal drain tube 11 of drain tubes 13 . referring to fig6 , various embodiments are provided with dimensions . these dimensions are provided as an example , and the drain catheters 10 / 10 ′ should not be restricted to these dimensions , as other dimensions are also considered . in accordance with a first embodiment , the drain tube 11 has an inner diameter 2 r of about 20 mm , with a thickness d of about 2 mm , for an outer diameter of about 24 mm . the nominal length of the drain tube 11 is up to 1 m . still in the first embodiment , the outer diameter of the tube interface 12 / 12 ′ is of about 20 mm ( i . e ., 2 r ), while the canals 22 have a radius r of about 4 mm . the distance b between the canals 22 is about 2 . 4 mm . the length of the tube interface 12 / 12 ′ is about 40 mm . still in the first embodiment , the outer diameter of the distal tubes 13 is of about 8 mm ( i . e ., 2 r ). the length of the distal tubes 13 is about 700 mm . the inner diameter of the drain tube 11 may range between 10 . 0 mm and 25 . 4 mm . the other dimensions of the drain catheter 10 / 10 ′ are generally proportional to that of the inner diameter of the drain tube 11 . in accordance with a second embodiment , the drain tube 11 has an inner diameter 2 r of about 10 mm , with a thickness d of about 2 mm , for an outer diameter of about 14 mm . the nominal length of the drain tube 11 is up to 1 m . still in the second embodiment , the outer diameter of the tube interface 12 / 12 ′ is of about 10 mm ( i . e ., 2 r ), while the canals 22 have a radius r of about 1 . 66 mm . the distance b between the canals 22 is about 2 . 44 mm . the length of the tube interface 12 / 12 ′ is about 40 mm . still in the second embodiment , the outer diameter of the distal tubes 13 is of about 3 . 3 mm ( i . e ., 2 r ). the length of the distal tubes 13 is about 700 mm . in an embodiment , the outer diameter of the proximal drain tube 11 is greater than a sum of an outer diameter of two of the distal drain tubes 13 . it is observed that the tube interface 12 / 12 ′ is arranged such that there is no increase in diameter from the distal tubes 13 to the main drain tube 11 , the largest outer diameter being that of the main drain tube 11 . whether the main drain tube 11 actually enters the body or not , the arrangement of the figures allows to use a single suction port and a single tube ( 11 ), for two or more distal drains 13 located at different regions of a body cavity . this may result in increased coverage resulting in enhanced drainage .
a drain catheter comprises a proximal drain tube having a proximal end adapted to outlet drained liquids and a distal end . a tube interface is at a distal end of the proximal drain tube , the tube interface having at least two canals open to a distal end of the proximal drain tube , the at least two canals being in fluid communication with the proximal drain tube . two or more distal drain tubes each having a proximal end and a distal end , the proximal end of each said distal drain tube being connected to a corresponding one of the canals such that the distal drain tubes are each in fluid communication with the corresponding one of the canals , the distal end of each said distal drain tube being open to collect liquids , a lumen of the distal drain tubes being smaller than a lumen of the proximal drain tube .