Introducer sheath with electrodes
An apparatus comprises a sheath for introducing a catheter into a blood vessel, at least one electrode provided on the sheath, at least one other electrode; and a measuring device to which at least one pair of electrodes are coupled. The measuring device measures the impedance or conduction velocity between the first electrode on the sheath and the second electrode.
1. An apparatus, comprising:
a sheath for introducing a catheter into a blood vessel;
a plurality of electrodes provided on said sheath;
one or more non-sheath electrodes; and
a measuring device to which the sheath and non-sheath electrodes are coupled, said measuring device detects a bleed by measuring the impedance or conduction velocity between at least two of the electrodes.
2. The apparatus of claim 1 wherein said sheath comprises a tubular member and at least one of the said electrodes is provided on an outer surface of said tubular member.
3. The apparatus of claim 1 wherein said sheath comprises a tubular member and at least one of the said electrodes is provided on an inner surface of said tubular member.
4. The apparatus of claim 1 wherein at least one of the said electrodes is embedded within material defining said sheath.
5. The apparatus of claim 1 wherein said electrodes include at least one electrode that is a ring electrode.
6. The apparatus of claim 1 wherein said electrodes include at least one electrode that is a partial ring electrode.
7. The apparatus of claim 1 further comprising conductive wires, one end of each which connects to one of the electrodes, and at least some of said wires extending along said sheath.
8. The apparatus of claim 1 further comprising conductive wires, one end of each wire connecting to one of the said electrodes, and at least some of said wires extending within said sheath.
9. The apparatus of claim 1 further comprising a dilator insertable into said sheath.
10. The apparatus of claim 1 wherein said non-sheath second electrode is a skin electrode or an electrode on a urinary catheter.
11. The apparatus of claim 1 further comprising one or more electrical conductors extending along at least part of the sheath with the separate conductors corresponding to the separate sheath electrodes, and with at least one conductor connecting to the measuring device to conduct a signal between at least one sheath electrode and the impedance measuring device.
12. The apparatus of claim 1 , further comprising an introducer usable to insert a catheter into a blood vessel, said sheath being a hollow sheath to receive the catheter when inserting the catheter into the blood vessel.