SYSTEMS AND METHODS FOR REDUCING OR PREVENTING BACKFLOW IN A DELIVERY SYSTEM
First Claim
1. A convection-enhanced-delivery (CED) device, comprising:
- a micro-tip having a proximal portion, a central portion, a distal portion, and at least one fluid channel extending along said proximal, central, and distal portions, the at least one fluid channel having an outlet port at a distal end thereof and an inlet port at a proximal end thereof;
a first outer sheath disposed coaxially over the distal portion of the micro-tip such that the distal portion of the micro-tip protrudes from a distal end of the first outer sheath;
a first tissue-receiving space defined between an exterior surface of the micro-tip and an interior surface of the distal end of the first outer sheath;
a catheter body extending proximally from the micro-tip such that the at least one fluid channel of the micro-tip is in fluid communication with a respective inner lumen of the catheter body; and
a nose portion disposed over at least the central portion of the micro-tip and extending between the first outer sheath and the catheter body such that the nose portion defines an exterior surface that tapers from a reduced distal diameter corresponding to the outside diameter of the first outer sheath to an enlarged proximal diameter corresponding to the outside diameter of the catheter body.
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Accused Products
Abstract
Systems and methods are disclosed herein that generally involve CED devices with various features for reducing or preventing backflow. In some embodiments, CED devices include a tissue-receiving space disposed proximal to a distal fluid outlet. Tissue can be compressed into or pinched/pinned by the tissue-receiving space as the device is inserted into a target region of a patient, thereby forming a seal that reduces or prevents proximal backflow of fluid ejected from the outlet beyond the tissue-receiving space. In some embodiments, CED devices include a bullet-shaped nose proximal to a distal fluid outlet. The bullet-shaped nose forms a good seal with surrounding tissue and helps reduce or prevent backflow of infused fluid.
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Citations
30 Claims
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1. A convection-enhanced-delivery (CED) device, comprising:
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a micro-tip having a proximal portion, a central portion, a distal portion, and at least one fluid channel extending along said proximal, central, and distal portions, the at least one fluid channel having an outlet port at a distal end thereof and an inlet port at a proximal end thereof; a first outer sheath disposed coaxially over the distal portion of the micro-tip such that the distal portion of the micro-tip protrudes from a distal end of the first outer sheath; a first tissue-receiving space defined between an exterior surface of the micro-tip and an interior surface of the distal end of the first outer sheath; a catheter body extending proximally from the micro-tip such that the at least one fluid channel of the micro-tip is in fluid communication with a respective inner lumen of the catheter body; and a nose portion disposed over at least the central portion of the micro-tip and extending between the first outer sheath and the catheter body such that the nose portion defines an exterior surface that tapers from a reduced distal diameter corresponding to the outside diameter of the first outer sheath to an enlarged proximal diameter corresponding to the outside diameter of the catheter body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 28, 29)
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26. A convection-enhanced-delivery (CED) device, comprising:
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a fluid conduit having proximal and distal ends; a first outer sheath disposed coaxially over the fluid conduit such that the fluid conduit extends out of a distal end of the first outer sheath; and a first tissue-receiving space defined between an exterior surface of the fluid conduit and an interior surface of the distal end of the first outer sheath.
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27. A micro-molding device, comprising:
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a mold cavity sized and configured to receive a catheter body and a catheter micro-tip therein such that at least one fluid channel of the micro-tip is at least partially disposed within a corresponding fluid line of the catheter body; and one or more mold channels though which a mold fluid can be injected to fill the mold cavity and secure the micro-tip to the catheter body such that the at least one fluid channel of the micro-tip is in fluid communication with the at least one fluid line of the catheter body.
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30-38. -38. (canceled)
Specification