Double wall catheter with internal printing and embedded marker

• US 5,045,071 A
• Filed: 01/19/1989
• Issued: 09/03/1991
• Est. Priority Date: 12/17/1985
• Status: Expired due to Fees

• Current Assignee: MBO Laboratories Incorporated
• Original Assignee: MBO Laboratories Incorporated
• Inventors: McCormick, William, O'Donnell, Miles C.
• Primary Examiner(s): Yasko, John D.
• Assistant Examiner(s): Cermak, Adam J.
• Application Number:
  US07/299,237
• Time in Patent Office: 957 Days
• Field of Search: 128/658, 128/737, 128/656, 128/653, 128/303.1, 128/207.14-207.17, 128/200.26, 128/653 R, 128/653 SC, 604/53, 604/282, 604/280, 604/270, 604/100, 604/194
• US Class Current: 604/529
• CPC Class Codes: A61M 16/0411 with means for differentiating between oesophageal and tracheal intubation
• CPC Class Codes: A61M 16/0484 at the distal end
• CPC Class Codes: A61M 2025/0008 having visible markings on its surface, i.e. visible to the naked eye, for any purpose, e.g. insertion depth markers, rotational markers or identification of type
• CPC Class Codes: A61M 25/0009 Making of catheters or other medical or surgical tubes
• CPC Class Codes: A61M 25/0015 Making lateral openings in a catheter tube, e.g. holes, slits, ports, piercings of guidewire ports; Methods for processing the holes, e.g. smoothing the edges
• CPC Class Codes: A61M 25/0108 using radio-opaque or ultrasound markers
• CPC Class Codes: A61M 25/0127 Magnetic means; Magnetic markers

Abstract

A catheter and a method of making the same, which catheter has a means for interferring with an electromagnetic field to allow accurate detection of the catheter through tissue, the catheter comprising a first tube extruded over a continuous, solid core material having a diameter equivalent to the desired diameter of the inner passageway of the catheter, bands of metal fused to the first tube at various locations, and a second tube which is extruded over the first and the metal bands. The double-walled continuous tube is then cut into individual tubes and the core material is removed to form the catheter of this invention, which has a smooth outer surface and an embedded metal band.

Claims

1. A catheter for insertion into biological tissue to provide an opening therein, and when so inserted, only the distal end of said catheter being detectable outside the biological tissue by means of a narrow electromagnetic field, said catheter comprising:

a double-walled tubular section having a proximal end and a distal end,

said double-walled tubular section, which does not interfere with an electromagnetic field, comprising a first tube, said first tube extending the entire length of said catheter from the proximal end to the distal end, said first tube defining an internal passageway which also extends the length of said catheter, and having an outer-surface which extends the length of said catheter, and a second tube, said second tube extending the length of said catheter and being connected to the outer surface of said first tube over its entire length forming a seam therebetween, said second tube having a smooth outer surface which defines the outer surface of said double-walled tubular section, and

a means for interfering with an electromagnetic field, said means for interfering being a small and narrow metal band attached to the outer surface of said first tube only at the distal end of said catheter, said metal band having a leading edge and a trailing edge which overlap when said band is wrapped around said first tube and which band is fused at least in part to said first tube, said means for interfering fitting into an indentation in an inner wall of said second tube at the distal end so as to maintain the smooth outer surface of said second tube without any protrusion at the means for interfering, said means for interfering disturbing a narrow electromagnetic field directed towards it even through biological tissue, but said means for interfering being so small and narrow a metal band so as to only disturb the field when the field is proximate to said means for interfering.

2. The cathetor of claim 1 wherein said first tube and said second tube are fused together along their respective lengths, except at said means for interfering, forming said seam therebetween.

3. The catheter of claim 1 wherein said second tube is transparent and said outer surface of said first tube has depth marking printed thereon.

4. The catheter of claim 1 wherein said said indentation fits over said metal band.

5. The catheter of claim 4 wherein said metal band is fused to said first tube.

6. The catheter of claim 1 wherein a radiopague stripe is included along the length of either said first tube or said second tube.

7. A catheter for insertion into biological tissue to provide an opening therein, and when so inserted, only the distal end of said catheter being detectable outside the biological tissue by means of a narrow electromagnetic filed, said catheter comprising:

a double-walled tubular section having a proximal end and a distal end,

said double-walled tubular section, which does not interfere with an electromagnetic field, comprising a first tube, said first tube extending the entire length of said catheter from the proximal end to the distal end, said first tube defining an internal passageway which also extends the length of said catheter, and having an outer surface which extends the length of said catheter, and a second tube, said second tube extending the length of said catheter and being connected to the outer surface of said first tube over its entire length forming a seam therebetween, said second tube having a smooth outer surface which defines the outer surface of said double-walled tubular section, and

a means for interfering with an electromagnetic field, said means for interfering being a small and narrow metal band attached to the outer surface of said first tube only at the distal end of said catheter, said metal band having a leading edge and a trailing edge, which said band is partially wrapped around said first tube with said edges fused to said tube, said means for interfering fitting into an indentation in an inner wall of said second tube at the distal end so as to maintain the smooth outer surface of said second tube without any protrusion at the means for interfering, said means for interfering disturbing a narrow electromagnetic field directed towards it even through biological tissue, but said means for interfering being so small and narrow a metal band so as to only disturb the field when the field is proximate to said means for interfering.