Stepped catheters with flow restrictors and infusion systems using the same
First Claim
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1. A catheter assembly, comprising:
- a tubular catheter body having proximal and distal ends, the body comprising an inner surface defining a body lumen extending between the proximal and distal ends;
a tubular needle comprising a proximal portion fixed relative to the catheter body and located within the body lumen, and a protruding portion extending distally beyond the distal end of the catheter body, wherein the needle further comprises;
an outer surface having a diameter that is less than a diameter of an outer surface of the catheter body; and
an inner surface defining a needle lumen in fluid communication with the body lumen, wherein a flow aperture in fluid communication with the needle lumen is provided along the protruding portion at or near a distal end of the needle;
a flow restrictor located within the needle lumen and fixed in position relative to the needle, the flow restrictor comprising a distal end positioned at or near the flow aperture;
a filter element positioned within the body lumen at or near a proximal end of the flow restrictor; and
a tubular sleeve positioned between the flow restrictor and the filter element.
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Abstract
A stepped catheter comprising a distal portion of smaller diameter than a proximal portion, wherein the distal portion defines a flow aperture configured to deliver fluid passing through the catheter from the proximal portion to the flow aperture. The catheter may include a flow restrictor located within a lumen of the catheter at or near the flow aperture. A filter element may also be included and located within the lumen of the catheter at a location upstream of the flow restrictor.
186 Citations
22 Claims
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1. A catheter assembly, comprising:
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a tubular catheter body having proximal and distal ends, the body comprising an inner surface defining a body lumen extending between the proximal and distal ends; a tubular needle comprising a proximal portion fixed relative to the catheter body and located within the body lumen, and a protruding portion extending distally beyond the distal end of the catheter body, wherein the needle further comprises;
an outer surface having a diameter that is less than a diameter of an outer surface of the catheter body; and
an inner surface defining a needle lumen in fluid communication with the body lumen, wherein a flow aperture in fluid communication with the needle lumen is provided along the protruding portion at or near a distal end of the needle;a flow restrictor located within the needle lumen and fixed in position relative to the needle, the flow restrictor comprising a distal end positioned at or near the flow aperture; a filter element positioned within the body lumen at or near a proximal end of the flow restrictor; and a tubular sleeve positioned between the flow restrictor and the filter element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A catheter assembly, comprising:
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a flexible tubular catheter body having proximal and distal ends, the body comprising an inner surface defining a body lumen extending between the proximal and distal ends; a guide tube fixed to the inner surface of the body near the distal end of the body such that the guide tube is at least partially located within the body lumen, the guide tube comprising a distal end face positioned at or near the distal end of the body; a tubular needle comprising a proximal portion extending along an inner surface of the guide tube, and a protruding portion extending distally beyond the distal end face of the guide tube, wherein the needle further comprises;
an outer surface having a diameter that is less than a diameter of an outer surface of the catheter body; and
an inner surface defining a needle lumen in fluid communication with the body lumen, wherein a side flow aperture in fluid communication with the needle lumen is provided along the protruding portion near a distal end of the needle, the side flow aperture defining a flow axis transverse to a longitudinal axis of the needle;an elongate flow restrictor positioned within the needle, the flow restrictor comprising a proximal end and a distal end, the distal end located at or near the side flow aperture; a filter element located near the proximal end of the flow restrictor within the body lumen; and a tubular sleeve positioned between the flow restrictor and the filter element. - View Dependent Claims (11, 12, 13, 14)
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15. An infusion catheter system comprising:
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a first therapy catheter comprising a proximal end and a distal end, wherein the first therapy catheter defines a first lumen extending from the proximal end of the first therapy catheter to a flow aperture through which fluid flowing distally through the first lumen of the first therapy catheter from the proximal end exits the first therapy catheter; a second therapy catheter comprising a proximal end and a distal end, wherein the second therapy catheter comprises a second lumen extending from the proximal end of the second therapy catheter to a flow aperture through which fluid flowing distally through the second lumen from the proximal end of the second therapy catheter exits the second therapy catheter; a flow splitter comprising;
a supply port;
a first exit port in fluid communication with the first lumen of the first therapy catheter; and
a second exit port in fluid communication with the second lumen of the second therapy catheter, wherein fluid entering the flow splitter through the supply port exits the flow splitter through either the first exit port or the second exit port;a first flow restrictor located within the first lumen near the flow aperture of the first therapy catheter such that the fluid flowing through the first exit port into the first lumen passes through the first flow restrictor; a second flow restrictor located within the second lumen near the flow aperture of the second therapy catheter such that the fluid flowing through the second exit port into the second lumen passes through the second flow restrictor; a first filter element positioned within the first lumen between the proximal end of the first therapy catheter and the first flow restrictor; a second filter element positioned within the second lumen between the proximal end of the second therapy catheter and the second flow restrictor; a first tubular sleeve positioned between the first flow restrictor and the first filter element; a second tubular sleeve positioned between the second flow restrictor and the second filter element; and a burr hole anchor configured to secure to tissue at a cranial burr hole, wherein the anchor is configured to receive and immobilize the first therapy catheter as it passes through the burr hole. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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Specification