Surgery – Means for introducing or removing material from body for... – Material introduced into and removed from body through...
Reexamination Certificate
1999-08-02
2001-02-20
Bockelman, Mark (Department: 3763)
Surgery
Means for introducing or removing material from body for...
Material introduced into and removed from body through...
C523S001000, C523S215000, C138S115000, C138S117000
Reexamination Certificate
active
06190349
ABSTRACT:
BACKGROUND OF THE INVENTION
Catheters for the introduction or removal of fluids may be located in various venous locations and cavities throughout the body for the introduction or removal of fluids. Such catheterization may be performed by using a single catheter having multiple lumens. A typical example of a multiple lumen catheter is a dual lumen catheter in which one lumen introduces fluids and one lumen removes fluids. Catheterization may also be performed by using separate, single lumen catheters inserted through two different incisions into an area to be catheterized. Such multiple catheter assemblies are known as Tesio catheters.
Generally, to insert any catheter in a blood vessel, the vessel is identified by aspiration with a long hollow needle in accordance with the Seldinger technique. When blood enters a syringe attached to the needle, indicating that the vessel has been found, a thin guide wire is then introduced, typically through a syringe needle or other introducer device, into the interior of the vessel. The introducer device then removed leaving the guide wire within the vessel. The guide wire projects beyond the surface of the skin.
At this point, several options are available to a physician for catheter placement. The simplest is to pass a catheter into the vessel directly over the guide wire. The guide wire is then removed leaving the catheter in position within the vessel. However, this technique is only possible in cases where the catheter is of a relatively small diameter, made of a stiff material and not significantly larger than the guide wire, for example, for insertion of small diameter dual lumen catheters. If the catheter to be inserted is significantly larger than the guide wire, a dilator device is first passed over the guide wire to enlarge the hole. The catheter is then passed over the guide wire, and the guide wire and dilator are removed.
In the case of an individual, singe-lumen catheter typically used in multiple catheter assemblies (e.g., a Tesio catheter), a physician may use an introducer sheath. If a Tesio is used for hemodialysis, for example, each catheter is inserted in two separate veins, such as the femoral vein. Alternatively, each catheter may be inserted in two different locations of the same vein, such as the internal jugular vein. The introducer sheath is simply a large, stiff thin-walled tube which serves as a temporary conduit for the permanent catheter which is being placed. The introducer sheath is positioned by placing a dilator device inside of the introducer and passing both the dilator and the introducer together into the vessel over a guide wire. The guide wire, left in the vessel after insertion as described above, and the dilator are then removed, leaving the thin-walled introducer sheath in place. The catheter is placed through the introducer sheath. Each of the catheters in the assembly is typically subcutaneously secured within the patient's body by a cuff located in a subcutaneous tunnel, or by otherwise externally affixing the catheter to the body.
The Tesio catheter may also be inserted in accordance with the technique described in U.S. Pat. No. 5,624,413 through a single insertion point using a sheath into the vessel. The Tesio, once inserted in the vessel, is then tunnelled separately through the patient in two subcutaneous tunnels for securement of the external, proximal portions of the catheter.
The Tesio double catheter assembly, while comfortable for the patient, due to its soft durometer, and very effective for hemodialysis, typically requires multiple procedures and incisions, which increase the attendant risks of the catheterization procedure. However, the Tesio double catheter assembly provides catheters which are capable of independent movement within the vessel. Such catheters present several advantages over unitary multi-lumen catheters. Because they are independently movable at their fluid outlets, it is possible to provide fluid intake and/or return flow around the entire circumference of the distal ends of the catheter tubes. In addition, if one tube becomes blocked, or otherwise requires replacement, it can be removed independently of the other tube. Further, the softer durometer of such catheters, which are typically made of a silicone or a similar material, reduces the risk of vessel wall damage. The 360° circumferential flow provides a more stable tube within the vessel, which is less likely to be suctioned against the vessel wall due to a pressure differential, as occasionally occurs in the use of some side-by-side multi-lumen catheters.
One recent catheter design, the SchonCath® catheter, available from Medical Components, Inc. of Harleysville, Pa., provides a partially connected Tesio. The individual catheters are permanently linked in one portion by a retaining sleeve for self-anchoring under the skin, as an alternative to requiring a fabric stabilizing cuff, such that such cuffs are optional. The distal ends are longitudinally prespaced by an appropriate distance to avoid recirculation. The retaining sleeve fits snugly around the individual catheters, and is positioned at a location along the length of the catheters to be situated outside the vessel wall, under the skin between the beginning of the subcutaneous tunnels and the vessel insertion site. While this device requires only one incision, it requires two subcutaneous tunnels in order to facilitate the self-retaining feature. This catheter provides independently movable distal ends within the vessel and 360° circumferential flow in the manner of a standard Tesio.
There is a need in the art for a multiple lumen catheter which provides the advantages of a multi-lumen catheter's single insertion and a single tunneling procedure, and which also provides the advantages of the Tesio and SchonCath® catheters.
SUMMARY OF THE INVENTION
The present invention relates generally to a multiple catheter assembly and methods for inserting the catheter assembly into an area within the body to be catheterized.
The invention includes a multiple catheter assembly, comprising a first catheter, a second catheter and a splittable membrane. The first catheter has a proximal tip, a distal end region terminating in a distal tip, and an outer surface defining at least a first lumen extending longitudinally therethrough between a distal and a proximal opening. The second catheter has a proximal tip, a distal end region terminating in a distal tip, and an outer surface defining at least a second lumen extending longitudinally therethrough between a distal and a proximal opening, wherein the first lumen and the second lumen are independent from each other for facilitating flow in opposite directions. The splittable membrane joins the outer surfaces of both the first and second catheters for allowing the first and second catheters to be at least partially longitudinally split from each other.
The invention further includes a method for inserting a multiple catheter assembly into an area of a body to be catheterized. The assembly comprises (i) a first catheter having a proximal end region terminating in a proximal tip, a distal end region terminating in a distal tip, and an outer surface defining at least a first longitudinally extending lumen, (ii) a second catheter having a proximal end region terminating in a proximal tip, a distal end region terminating in a distal tip, and an outer surface defining at least a second longitudinally extending lumen, wherein the first lumen and the second lumen are independent from each other for facilitating flow in opposite directions, and (iii) a splittable membrane joining the outer surfaces of both the first and second catheters. The method comprises the steps of making an incision near the area to be catheterized, at least partially splitting the distal end regions of the first catheter and the second catheter from each other by splitting the splittable membrane; and inserting the distal end regions of the first and second catheters in juxtaposed relation through the incision and into the area to be catheteriz
Ash Stephen R.
Madison Anthony J.
Schweikert Timothy M.
Akin Gump Strauss Hauer & Feld L.L.P.
Bockelman Mark
Hemocleanse, Inc.
Thanh Loan H.
LandOfFree
Splittable multiple catheter assembly and methods for... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Splittable multiple catheter assembly and methods for..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Splittable multiple catheter assembly and methods for... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2612289