Infusion catheters with slit valves and of simplified construction
The present invention relates to catheters to deliver a fluid to a patient. A catheter of the invention comprises a plurality of slits through which the fluid is delivered to the patent. A catheter of the invention is designed in a simple manner to lower costs and provide a reliable means to deliver fluids to a patient. The invention further comprises methods for making a catheter of the invention and methods of delivering a fluid to a patient with a catheter of the invention.
1 . A catheter for delivering a fluid to a patient comprising a tube, said tube comprising a lumen and wall with delivery slits in said wall, wherein said tube has an outside diameter of about 0.020 to about 0.125 inches, wherein said delivery slits are in an infusion segment of the tube, wherein said infusion segment includes at least one slit per inch, wherein said catheter has a cracking pressure of at least 0.1 psi, wherein said catheter does not comprise a spring, a membrane or a wick in said lumen.
2 . The catheter according to claim 1 , wherein said cracking pressure comprises at least 0.2 psi.
3 . The catheter according to claim 1 , wherein said infusion segment comprises at least 10 slits.
4 . The catheter according to claim 1 , wherein said infusion segment comprises two infusion segments.
5 . The catheter according to claim 4 , wherein said infusion segments are on different sides of the catheter.
6 . The catheter according to claim 1 , wherein said catheter has at least two lumens and wherein each of said two lumens has an infusion segment with delivery slits, and wherein said catheter does not comprise a spring, a membrane or a wick in said two lumens.
7 . The catheter according to claim 6 , wherein a flow restrictor is associated with each of said two lumens.
8 . The catheter according to claim 6 , wherein said catheter has a cracking pressure of at least 0.2 psi.
9 . The catheter according to claim 6 , wherein said cracking pressure comprises at least 0.2 psi.
10 . The catheter according to claim 6 , wherein said infusion segment comprises at least 10 slits.
11 . The catheter according to claim 6 , wherein said infusion segment comprises two infusion segments.
12 . The catheter according to claim 11 , wherein said infusion segments are on different sides of the catheter.
13 . A method for delivering a fluid to a patient comprising delivering said fluid with a catheter, said catheter comprising a tube, said tube comprising a lumen and wall with delivery slits in said wall, wherein said tube has an outside diameter of about 0.020 to about 0.125 inches, wherein said delivery slits are in an infusion segment of the tube, wherein said infusion segment includes at least one slit per inch, wherein said catheter has a cracking pressure of at least 0.1 psi, wherein said catheter does not comprise a spring, a membrane or a wick in said lumen.
14 . The method according to claim 13 , wherein said cracking pressure comprises at least 0.2 psi.
15 . The method according to claim 13 , wherein said catheter has at least two lumens and wherein each of said two lumens has an infusion segment with delivery slits, and wherein said catheter does not comprise a spring, a membrane or a wick in said two lumens.
16 . The method according to claim 15 , wherein said catheter has a cracking pressure of at least 0.2 psi.
17 . A method for making a catheter comprising taking a catheter tube and generating a delivery slit in said catheter tube with a device selected from the group consisting of a lancet, a needle, a pointed needle, a round needle, a blade, and a beveled blade, wherein said delivery slits are in an infusion segment of the tube, wherein said infusion segment includes at least one slit per inch, wherein said catheter has a cracking pressure of at least 0.1 psi, and wherein said method does not comprise inserting a spring, a membrane or a wick in the said catheter tube.
18 . The method according to claim 17 , wherein said catheter has a cracking pressure of at least 0.2 psi.
19 . The method according to claim 17 , wherein said catheter has at least 5 delivery slits.
20 . The method according to claim 17 , wherein said catheter has at least 10 delivery slits.