|Publication number||WO1998039040 A1|
|Publication date||11 Sep 1998|
|Filing date||7 Mar 1997|
|Priority date||7 Mar 1997|
|Publication number||PCT/1997/3718, PCT/US/1997/003718, PCT/US/1997/03718, PCT/US/97/003718, PCT/US/97/03718, PCT/US1997/003718, PCT/US1997/03718, PCT/US1997003718, PCT/US199703718, PCT/US97/003718, PCT/US97/03718, PCT/US97003718, PCT/US9703718, WO 1998/039040 A1, WO 1998039040 A1, WO 1998039040A1, WO 9839040 A1, WO 9839040A1, WO-A1-1998039040, WO-A1-9839040, WO1998/039040A1, WO1998039040 A1, WO1998039040A1, WO9839040 A1, WO9839040A1|
|Inventors||Athanasios D. Pratilas|
|Applicant||Pratilas Athanasios D|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (8), Referenced by (1), Classifications (5), Legal Events (4)|
|External Links: Patentscope, Espacenet|
CURVED INTRA VENOUS/ARTERY CATHETER (CIVAC)
FIELD OF THE INVENTION
This invention relates to catheters used in obtaining access to blood vessels and particularly to catheters used in restricted access areas of a patient's body.
BACKGROUND OF THE INVENTION
Catheters for obtaining access to a patient's veins or arteries, i.e., blood vessels, such as for iv infusion, for blood access, or for access to internal body sites for medical procedures, e.g., balloon catherization, are usually effected by deployment of a hollow needle catheter, with an access tube thereon, into a patient's blood vessel. The needle catheter, with an angled point, is inserted into the blood vessel and when it is certain that placement is complete, such as by testing with a syringe to see if blood can be drawn through the needle, the tube is pushed into the blood vessel and the needle is withdrawn, thereby leaving the access tube in position in the blood vessel. The access tube's exposed end is provided with coupling means for attachment to a fluid source (e.g., iv) or device which provides the requisite operation (access needle, probe, etc.) .
These catheters generally comprise straight needles which are manually inserted by parallel (or as close to parallel as possible) placement against a patient's skin and a thrust into the blood vessel. Problems arise with such catheters when this manner of placement is impeded as a result of the requisite position for the catheter placement being in a partially inaccessible area of the patient's body such as the neck. Improper placement, such as puncturing or penetration of a posterior instead of anterior wall of a blood vessel, resulting from inexperience or impeded placement sites, can result in hematoma or, in many instance, the blood vessel may actually be only tangentially or even entirely missed, with the necessity for numerous attempts at proper insertion. SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide an intra venous/artery catheter assembly with improved placement capability even in obstructed skin locations. It is a further object of the present invention to provide a method for a fully guided and supported catheter emplacement. -"
Generally the present invention comprises a catheter assembly comprised of inner and outer catheter elements. The inner catheter element comprises a rigid hollow member of uniform diameter having a straight section terminating at one end in a standard hollow needle point. In accordance with the present invention, the other end of the straight section gradually curves into a curved section, terminating in a stop member (with respect to cooperative engagement with the outer catheter element) and a manipulating handle portion, offset from the straight section. The degree of this offset is at least sufficient to permit the curved section to be used as a handle, to depress the straight section against a patient's skin, with minimized or without impeding contact between the patient and the user.
The outer catheter element which is snugly but slidingly fitted over the inner catheter element, is comprised of a flexible tube, preferably straight , which conforms to the curvature of the inner catheter, and is of a length allowing the needle point to be exposed for insertion into the patient. The curve of the inner catheter must be sufficiently gradual (and without sharp corners or other snagging shapes) such that inner catheter can be easily slidingly removed from the outer catheter without disturbing the placement of the outer catheter tube.
In use, the straight section of the catheter is placed against the patient's skin with alignment of the needle point with the desired insertion point into the patient. The curved section of the catheter is used to push the straight section down, with depression of the patient's skin (and depression of an adjacent lead-in portion of the blood vessel) whereby a forward movement of the catheter provides a guided insertion into the desired point. After full insertion of the catheter into the blood vessel, the inner catheter is slidingly removed, while leaving the outer tube (which re-assumes its normal straight configuration) in place for continued access to the blood vessel .
The above objects, features and advantages of the present invention will become more evident from the following discussion and drawings in which:
SHORT DESCRIPTION OF THE DRAWINGS
Figure 1 is an isometric view of the rigid, curved, inner catheter element of the present invention;
Figure 2 is an isometric view of the straight, flexible, outer catheter element of the present invention.
Figures 3a and 3b depict partially sectioned view of the catheter elements of Figures 1 and 2 fully and partially engaged with each other respectively;
Figures 4a-c sequentially show insertion of the catheter of Figures 3a and 3b into a vein in the back of a hand;
Figures 5a and 5b depict insertion of the catheter of the present invention in the limited access areas of the neck and foot of patients .
DETAILED DESCRIPTION OF THE INVENTION
The stop members of the inner and outer catheters are preferably radially extending and circular in configuration and cooperatively cofitting such that when fully abutted with each other the flexible outer tube extends to but does not cover the needle point of the curved, rigid inner catheter element, whereby the needle point is exposed for use. The inner flexible tube is adapted to be removably fitted on the rigid inner catheter element such that the stop member thereof does not impede removal of the inner rigid needle member after placement of the tube into a blood vessel . In a preferred embodiment, the stop member of the flexible tube is configured to accommodate a conical section extending from the stop member of the rigid, inner catheter element, which is preferably the same as that of a syringe tip which enters into the needle's coupling. As" a result, the inner tube is adapted to be fitted to a syringe with removal of the inner rigid catheter element .
DETAILED DESCRIPTION OF THE DRAWINGS
AND THE PREFERRED EMBODIMENT
With specific reference to the drawings, Figures 1 and 2 depict catheter inner and outer elements 1 and 8 respectively, which are engaged with each other to provide catheter assembly 10 shown in Figures 3a and 3b. Inner catheter element 1 is comprised of a rigid material such as metal and is configured as uniform diameter, open ended, hollow tube 3 which terminates at one end in angled needle tip 3a of standard configuration. Hollow tube 3 is comprised of straight segment la adjacent angled needle tip 3a. At a distance "d" from needle tip 3a, gradually curved segment lb continues away from needle tip 3a and terminates in segment lc which is in internal engagement with hollow cored conical fitting 2a (of a configuration similar to that of the engagement portion of a syringe with a needle) and stop collar 2b. Tube 3 extends through the stop collar 2b and is enclosed by open ended cylindrical member 2c, which permits syringe access to the interior of tube 3 to permit drawing of blood as an indication of proper catheter placement .
Straight flexible tube 8, with tube portion 8a and integrated collar section 8b, is adapted to snugly but slidingly fit over tube 3 of rigid member 1 and receive conical fitting 2a within collar section 8b until stop collar 2b and stop flange 8c come into abutting contact as shown in Figures 3a and 3b. Because of the flexibility of the material comprising tube 8, it assumes the curved configuration of the rigid member but re-assumes its straight configuration when the curved rigid inner element is removed. When the inner and outer catheter elements 1 and 8 are fully fitted together, tube 8 allows needle tip 3a to be exposed for use in placement of catheter 10, as illustratively shown in Figures 4a-c.
As shown in Figure 4a, catheter 10 is initially positioned such that straight section la is parallel to the skin surface of hand 30 and aligned with blood vessel 31 into which the catheter is to be placed. As shown in Figure 4b, straight section la is depressed onto the skin surface, with the sections lb and lc being manually grasped and manipulate as shown in Figure 4c. Blood vessel 31 is pushed down forming a small angle 31'. The catheter is then pushed forward into the blood vessel 31 at angle 31' and linearly enters the blood vessel 31 at the angle juncture. As indicated (depicting a start of a separation apart from the patient) in Figure 3b, tube 8 is pushed forward into the blood vessel and the rigid curved element 1 is removed from the tube to complete the tube placement. The tube 8 re- assumes its straight configuration for connection with an iv, or for whatever purpose the catheter is required.
Figures 5a and 5b depict use of the catheter 10 in a foot 50 and neck position respectively. It is specifically noted that the curvature of the catheter 10 allows it to be properly positioned in a blood vessel in neck 100 without being impeded by the patient's cheek or chin.
For various purposes and needs, the catheter and catheter elements of the present invention can be made in a variety of sizes and lengths. It is understood that the above description and drawings of a preferred embodiment are illustrative in nature and that changes in configuration, structure and components is possible without departing from the scope of the present invention as defined in the following claims .
|Cited Patent||Filing date||Publication date||Applicant||Title|
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|US5242409 *||16 May 1991||7 Sep 1993||Applied Medical Resources Corporation||Flexible access device|
|US5284476 *||20 Mar 1992||8 Feb 1994||Koch Paul S||Nuclear hydrolysis cannula|
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|Citing Patent||Filing date||Publication date||Applicant||Title|
|US6758854||25 Jun 1999||6 Jul 2004||St. Jude Medical||Splittable occlusion balloon sheath and process of use|
|International Classification||A61M25/00, A61M25/06|
|Cooperative Classification||A61M25/0606, A61M25/0041|
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