Source: http://www.google.com/patents/USRE41462?dq=5,581,513
Timestamp: 2014-03-08 19:53:56
Document Index: 600156968

Matched Legal Cases: ['arts 68', 'arts 68', 'arts 68', 'arts 68', 'arts 70', 'arts 68', 'art 102', 'art 102']

Patent USRE41462 - Bent co-axial catheter - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsThe invention provides a co-axial dual lumen catheter having a main section, a tip section, and a U-shaped proximal portion extending from the main section, and ending at a junction where intake and outlet tubes are connected to the proximal portion. An inner tube extends from the junction to the tip...http://www.google.com/patents/USRE41462?utm_source=gb-gplus-sharePatent USRE41462 - Bent co-axial catheterAdvanced Patent SearchPublication numberUSRE41462 E1Publication typeGrantApplication numberUS 08/723,842Publication dateJul 27, 2010Filing dateSep 27, 1996Priority dateDec 22, 1992Also published asCA2149402A1, DE69321257D1, DE69321257T2, EP0675743A1, EP0675743B1, US5350358, WO1994014493A1Publication number08723842, 723842, US RE41462 E1, US RE41462E1, US-E1-RE41462, USRE41462 E1, USRE41462E1InventorsGeoffrey S. MartinOriginal AssigneeVas-Cath IncorporatedExport CitationBiBTeX, EndNote, RefManPatent Citations (52), Non-Patent Citations (1), Classifications (13) External Links: USPTO, USPTO Assignment, EspacenetBent co-axial catheterUS RE41462 E1Abstract The invention provides a co-axial dual lumen catheter having a main section, a tip section, and a U-shaped proximal portion extending from the main section, and ending at a junction where intake and outlet tubes are connected to the proximal portion. An inner tube extends from the junction to the tip of the catheter to define a return lumen, and combines with outer tubes in the main section and the proximal portion to define an intake lumen. The inner tube is thin walled relative to the wall thickness of a first outer tube used in the main section, and a second outer tube used in the proximal portion has a greater cross-sectional area than the first outer tube. A proximal end structure is also described in which the intake and outlet tubes extend generally parallel with the main body and to one side of the main body.
a main section having proximal and distal ends and including a first outer tube, the first outer tube extending along a longitudinal axis and defining intake openings; a U-shaped proximal section including a proximal and a distal end, said distal end of said U-shaped proximal section being attached to the proximal end of the main section, the proximal section including a second outer tubes ; an inner tube extending through the first and second outer tubes; the inner tube defining a return lumen and combining with the first and second outer tubes to define an annular intake lumen; intake and outlet tubes; a junction coupling the intake and outlet tubes to the proximal section with the intake tube coupled for receiving blood from the intake lumen and the outlet tube coupled for delivering treated blood to the return lumen; and the intake and outlet tubes leaving the junction generally parallel with the main section and to one side of the main section and with an angle of divergence between the intake and the outlet tubes of less than about 30 degrees and spaced substantially equally to either side of an extension of saidthe longitudinal axis of said U-shaped proximal section at said proximal end thereof. 11. A catheter as claimed in claim 10 in which the angle of divergence is about 15 to 20 degrees.
a main section for insertion and having a selected cross-section; a tip section of smaller cross-section than the selected cross-section and attached to a distal end of the main section; a U-shaped proximal section extending from a proximal end of the main section and having a cross-section greater than said selected cross-section; the main section having a first outer tube of a selected wall thickness and having said selected cross-section and the proximal section having a second outer tube having a wall thickness greater than said selected wall thickness; an inner tube extending from the tip section through the first and second outer tubes and having a wall thickness less than said selected wall thickness whereby an intake lumen is defined in the space between the inner tube and the first and second outer tubes, and a return lumen is defined by the inner tube and the tip section; and a junction coupled to the inner tube and the second outer tube to facilitate connecting the catheter to dialysis equipment. 14. A catheter as claimed in claim 13 and further comprising a distal transition portion where the inner tube, tip section, and first outer tube of the main section meet, thesaid transition portion presenting a smooth tapered outer surface to facilitate insertion.
BACKGROUND OF THE INVENTION This invention relates to co-axial dual lumen catheters for use in haemodialysis treatments and more particularly to such a catheter for placement in a jugular vein.
FIG. 2 is a sectional view on line 2�2 of FIG. 1 and drawn to a larger scale;
FIG. 3 is a sectional view on line 3�3 of FIG. 1 and drawn to the same scale as FIG. 2;
Reference is made firstly to FIG. 1 which illustrates a co-axial catheter designated generally by the numeral20 andthat encloses a pair of distinct, longitudinally extending, fluid flow lumens. Catheter 20 is useful for withdrawing blood through an intakewithdrawal structure 22 and returning treated blood through an outletreturn structure 24. The intake and outletWithdrawal structure 22 includes a flexible first tube 26 that communicates with one of the lumens in catheter 20 and that terminates in a first luer connector 27. Return structure 24 includes prospectivea flexible second tubes 26,28 whichthat communicates with the other of the lumens in catheter 20 and that terminates in a second luer connector 29. Each of first tube 26 and second tube 28 can be clamped using conventional devices, such as device 30 shown on second tube 28 and which terminate at respective luer connectors 27, 29 .
As a result of this arrangement thefirst and second access tubes 26, 28 extend generally in parallel with the main section 37 of catheter 20 and lie to onetogether on the same side of themain section 37.
As seen in FIG. 2, the main section 37 includes an outer tube 46 containingenclosing an inner tube 48. whichInner tube 48 also extends through an outer tube 60 in the proximal portion 34 as will be explained . The innerInner tube 48 is therefore continuous, having a first part inside outer tube 46 in the main section 37 and thea second part inside the outer tube 60 forming part of thein proximal portion 34. The innerInner tube 48 is free, but for attachments at itsthe ends as will be explainedthereof.
The junction 32 at the proximal end of the U-shaped proximal portion 34 connects tubes 48, 60 to thefirst tube 26 and second tubes 26,28 (as will be explained) and the catheterto respective of the lumens in catheter 20. First tube 26 communicates through junction 32 with intake lumen 50 in inner tube 48. Thus, first tube 26 will on occasion hereinafter in the alternative be referred to as intake tube 26. Second tube 28 communicates through junction 32 with the part of return lumen 52 formed between inner tube 48 and outer tube 60 in proximal portion 34 of catheter 20. Second tube 28 will on occasion hereinafter in the alternative be referred to as outlet tube 28.
As seen in FIG. 5, the intake lumen 50 terminates at a blind annular end wall 80 at thedistal transition portion 39. The intakeIntake lumen 50 is contained between outer tube 46 and inner tube 48 and thein main section 37. Withdrawal openings 40 are provided immediately adjacent thedistal transition portion 39 to allow blood flow into theintake lumen 50. More withdrawal openings can of course be provided further away from thedistal transition portion (39, as seen in FIG. 1) if required .
The return lumen 52 formerly described with reference to the inner tube 48, now continues distally through thedistal transition portion,39 and through the tip section 38. TheDistal transition portion 39 ends the intake lumen 50 and blends smoothly from the outer surface of the tip section 38 to the outer surface of the main section 37, and in particular to the outer surface of the outer tube 46.
It should be noted in FIG. 5 that the three parts, namely the68, 70, 72, variously of outer andtube 46, inner tubes 46,48, and the tip section 38, are shown as three individual parts by the shadinguse of contrasting cross hatching. Where theyparts 68, 70, 72, meet at thedistal transition portion 39, the shadingcross hatching has been omitted, because this is aat distal transition portion where39 the materials of parts 68, 70, 72, flow into one another, and it isrendering indefinite where each of the parts 68, 70, 72, begins and ends after molding. However byFrom a comparison between FIGS. 4 and 5 it is evident that the parts 68, 70 blend into one as do the parts 70 and 72, resulting in thedistal transition portion 36 39. Preferably, the parts 68, 70, 72, are all polyurethane with theof grades and sizes being chosen to provide the desired physical characteristics, such as a soft pliable tip section 38 and a stiffer outer tube 46 with a thin walled inner tube 48.
The projection 108 on the end of the mandrel 94 is shaped to fit the space provided between outer tube 60 and inner tube 48, when the inner tube 48 is held by mandrel 96 against the inner surface of the outer tube 60. As a result itprojection 108 has a generally U-shaped configuration. The angular offsets of the projection 108 of mandrel 94 and thethe angular offset of end part 102 of lumenmandrel 96 result in the projection 108 and end part 102 extending in parallel axially with respect to axis L of the end of proximal portion 34 at junction 32. The cylindricalCylindrical portions98 of mandrel 96 and cylindrical portion 104 of mandrel 94 can thus be assembled as shown in FIG. 7 so as to diverge sufficiently with respect to the axial main section that the ends of the respective intake tube 26 and outlet tubes 26,28 can be accommodated on the mandrels 94, 96, respectively, with the ends of intake tube 26 and of outlet tube 28 positioned in the mold to become entrapped in the junction 32.
The angle shown as �A� in FIG. 7 indicates the divergence between theintake and outlet tubes 26, 28 as they meet theat junction 32. Because of the construction it is possible to maintain this divergence angle A in the order of 15 to 20 degrees, and is readily maintained below 30 degrees. As a result, the flow of fluid into and out of the catheter 20 is essentially axial with reference to the end of proximal portion 34 at junction 32 at all times. This is because the angle of each of thefirst and second access tubes 26, 28 with reference to the axis L of theproximal portion 34 where it meets theat junction 32 is half of the range up to 30 degrees.
In a typical embodiment of catheter 20 the various tubes used in the structure are polyurethane. The outerOuter tube 46 is a firm polyurethane having a 65D Durometer. It is, a 3.175 mm inside diameter, and a 3.734 mm outside diameter. The tipTip section 38 is also 65D Durometer, but with an inside diameter of 1.727 mm and an outside diameter of 2.667 mm. The innerInner tube 48 is of a soft, thin-walled polyurethane dimensioned to fit intoextend through the assembly shown in FIG. 3, and thewith sufficient clearance between the exterior of inner tube 48 and the interior of that assembly to result in the creation of intake lumen 50 therebetween. Inner tube 48 has a wall thickness that is less than the wall thickness of outer tube 46. Outer tube 60 is proportioned to fit over theabout outer tube 46 in the manner illustrated in FIG. 3, whereby the cross section of outer tube 60 and the associated area of the cross section of outer tube 60 are greater, respectively, than the cross section of outer tube 46 and the associated area of the cross section of outer tube 46. TheOuter tube 60 has a wall thickness of about 1.31 mm and a hardness of 85A Durometer to minimize the risks of kinking and to protect the inner tube 48.
Firstly, the structure of catheter 20 is such that the inner tube 48 can be thin walled because it is protected by the stiffer outer tube 46 in the main section 37 and by the outer tube 60 in the curved proximal portion 34. TheThus, thin-walled, soft inner tube 48 takes up minimal cross-sectional space, thereby permitting the portion of the co-axial catheter 20 which is to be inserted into the body of a patent to have a smaller cross-section.
Another feature of catheter 20 is the fact that there is a minimum of upwardly extending structure beyond the attachmentproximal transition portion 36, when the catheter 20 is placed in a jugular vein. This is very important to the comfort of the patient. Also, because attachment takes place where the catheter 20 exits the incision, manipulation of theintake tube 26 and outlet tubes28 to make connections etc. will have less likelihood of dislodging or moving the catheter 20.
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DanforthControllable flexibility catheter with eccentric stiffener* Cited by examinerNon-Patent CitationsReference1Shiley, Incorporated, "Shiley Has It All Together," 12 Dialysis & Transportation 300 (Apr. 1983).Classifications U.S. Classification604/43International ClassificationA61M25/00, A61M1/30, A61M1/14, A61M3/00Cooperative ClassificationA61M2001/3661, A61M2025/0031, A61M2025/0039, A61M25/0637, A61M25/0041, A61M2025/0034, A61M2025/0253European ClassificationA61M25/00R2RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google