Self-occluding catheter
View Patent ↗A self-occluding catheter includes a body portion for connection to extracorporeal equipment. An elongated tubular extension is provided for insertion into a body cavity. The body portion includes a resiliently biased spool supported therein which is slidable between an open and a closed position for alternately permitting and stopping the flow of blood through the catheter during a given medical procedure. The biasing device for resilient biasing the spool preferably comprises one or more magnets fixed within the body portion which generate a magnetic force for urging the magnetically polarized spool to its closed position.
1. A catheter hub comprising:
a first lumen extending therethrough from a first proximal port to a first distal opening;
a second lumen extending therethrough from a second proximal port to a second distal opening;
a transverse bore in fluid communication with the first and second lumens;
a first occluding device slidably received within the transverse bore for movement between an occluding position preventing flow through the first lumen and an open position opening the first lumen to fluid flow, wherein the first occluding device includes a first magnetically polarized element slidably supported within the transverse bore;
a second occluding device slidably received within the transverse bore for movement between an occluding position preventing flow through the second lumen and an open position opening the second lumen to fluid flow;
a first biasing element positioned in alignment with the transverse bore on a side of the first lumen opposite the first occluding device urging the first occluding device into the occluding position;
a second biasing element positioned in alignment with the transverse bore on a side of the second lumen opposite the second occluding device urging the second occluding device into the occluding position;
a first peripheral chamber which, when the first occluding device is in the occluding position, remains fluidly coupled to a portion of the first lumen extending proximally therefrom, the first peripheral chamber in alignment with the transverse bore so that fluid pressure applied to the first proximal port acts on an end of the first occluding device so that application of at least a predetermined threshold fluid pressure to the first proximal port moves the first occluding device to the open position; and
a second peripheral chamber which, when the second occluding device is in the occluding position, remains fluidly coupled to a portion of the second lumen extending proximally therefrom, the second peripheral chamber in alignment with the transverse bore so that fluid pressure applied to the second proximal port acts on an end of the second occluding device so that application of at least a predetermined threshold fluid pressure to the second proximal port moves the second occluding device to the open position.
2. The catheter hub of claim 1 , wherein the first biasing element comprises a first magnetic element positioned in alignment with the transverse bore on a side of the first lumen opposite the first occluding device, a magnetic polarity of the first magnetic element being opposite a magnetic polarity of the first occluding device so that repellent forces generated between the first magnetic element and the first occluding device urge the first occluding device into the occluding position.
3. The catheter hub of claim 2 , wherein the second biasing element comprises a second magnetic element positioned in alignment with the transverse bore on a side of the second lumen opposite the second occluding device, a magnetic polarity of the second magnetic element being opposite a magnetic polarity of the second occluding device so that repellent forces generated between the second magnetic element and the second occluding device urge the second occluding device into the occluding position.
4. The catheter hub of claim 1 , wherein the first magnetically polarized element is a spool.
5. The catheter hub of claim 1 , wherein a face of the first occluding device facing the first peripheral chamber includes a magnet mounted therein.
6. The catheter hub of claim 2 , wherein the first biasing element comprises a spring urging the first occluding device into the occluding position.
7. The catheter hub of claim 2 , wherein the first and second occluding devices comprise first and second end portions, respectively, of a substantially cylindrical element connected to one another by a central portion, diameters of the first and second end portions being slightly less than a diameter of the transverse bore to provide a close sliding relationship therebetween, connection between the first and second end portions causing the second occluding device to be in the occluding position whenever the first occluding device is in the occluding position and causing the second occluding device to be in the open position whenever the first occluding device is in the open position.
8. The catheter hub of claim 7 , wherein a diameter of the central portion is smaller than that of the first and second end portions to permit flow therearound through the first and second lumens when the first and second occluding devices are in the open position.
9. The catheter hub of claim 2 , wherein at least one of the first and second end portions includes a sealing ring preventing fluid flow through the transverse bore between the first and second lumens.
10. The catheter hub of claim 2 , further including an distal connector including the first and second distal openings, the distal connector being adapted to couple to a proximal end of a catheter fluidly coupling the first and second lumens to corresponding lumens of the catheter.
11. The catheter hub of claim 2 , wherein the first and second peripheral chambers are formed as increased diameter portions of the first and second lumens, respectively.
12. The catheter hub of claim 2 , wherein a separation between the first and second proximal ports is greater than a separation between the first and second distal openings.