Steerable endoluminal punch
A transseptal needle or punch wherein the distal end of the transseptal needle is able to articulate laterally out of the longitudinal axis of the steerable transseptal needle. The transseptal needle further comprise a blunted distal end configuration that is minimally traumatic. Under control by the user or a computer, at the proximal end of the transseptal needle can be articulated to generate various curves with high bending force. The transseptal needle is configured for use within a transseptal introducer.
1. An apparatus adapted for punching a hole in a body lumen or hollow organ of a mammal comprising:
an outer tube having a proximal end, a distal end, a longitudinal axis, and a lumen extending therethrough;
an inner tube having proximal end, a distal end, a longitudinal axis, and a lumen extending therethrough, said inner tube disposed within the distal end of the outer tube, with a portion of said inner tube projecting distally from the distal end of the outer tube;
a first control rod and a second control rod disposed within the lumen of the outer tube,
a plurality of laterally oriented slits extending partway into the outer tube within a bendable region but not completely transecting the outer tube;
a connection point between the first control rod and the outer tube such that the first control rod is affixed to the outer tube on a side of the outer tube comprising the laterally oriented slits and distally to the bendable region,
a connection point between the second control rod and the outer tube such that a distal end of the second control rod is affixed to the outer tube on a side of the outer tube opposite the laterally oriented slits and distally to the bendable region,
a needle hub affixed to the proximal end of the inner tube, wherein said needle hub comprises an internal lumen capable of receiving a control mechanism, wherein the outer tube is longitudinally constrained relative to the needle hub; and
the control mechanism is operable to tension one of (1) the first control rod or the second control rod and (2) the outer tube to the other of (1) the first control rod or the second control rod and (2) the outer tube.
2. The apparatus of claim 1 wherein said needle hub comprises a valve at its proximal end.
3. The apparatus of claim 1 further comprising a control rod retainer configured to maintain the first control rod and the second control rod off center within the lumen of the outer tube.
4. The apparatus of claim 3 wherein:
the first control rod and the second control rod have arcuate transverse cross sections, and the control rod retainer has an arcuate transverse cross section, and the first control rod and the second control rod and the control rod retainer are disposed between the outer tube and the inner tube.
5. The apparatus of claim 1 wherein longitudinal movement of the first control rod and the second control rod relative to the outer tube causes distortion of the outer tube in a region of the laterally oriented slits and results in selective bending of the outer tube and the first control rod and the second control rod in the region of the laterally oriented slits.
6. The apparatus of claim 1 wherein the first control rod is integral, or affixed to, the second control rod in a region distal to the bendable region.
7. The apparatus of claim 1 wherein the first control rod is not affixed to the second control rod in a region distal to the bendable region.
8. The apparatus of claim 1 wherein the first control rod and the second control rod are affixed to an intermediate structure, which is, in turn, affixed to a hub.
9. The apparatus of claim 1 wherein the first control rod and the second control rod are affixed to a distal length of tubing which extends distal to the outer tube.
10. The apparatus of claim 1 wherein the first control rod and the second control rod are affixed to a distal length of tubing which extends distal to the outer tube and is terminated in a sharp point.
11. The apparatus of claim 1 wherein the distal end of the outer tube can controllably curve between about 0 and at least about 60 degrees from the longitudinal axis.
12. The apparatus of claim 1 wherein axial advancement of the first control rod and the second control rod relative to each other and the outer tube curves the distal end of the apparatus.
13. The apparatus of claim 1 further comprising a pressure jacket disposed exterior to the outer tube wherein the pressure jacket prevents ingress or egress of fluid through the laterally oriented slits.
14. The apparatus of claim 1 further comprising an innermost tube, further comprising a proximal end, a distal end, and a lumen therethrough, disposed interior to the first control rod and the second control rod and preventing the ingress or egress of fluid from the interior lumen of the innermost tube.
15. The apparatus of claim 1 further comprising a removable obturator or stylet slidably disposed within a central lumen defined by the first control rod and the second control rod, wherein the obturator or stylet can be advanced forward out the distal end of the apparatus or it can be removed from the apparatus by withdrawal through the proximal end of the apparatus.
16. The apparatus of claim 1 wherein the first control rod and the second control rod are operably moved by electrical motors, pneumatic actuators, or hydraulic pistons.
17. The apparatus of claim 1 further comprising one or more radiopaque markers capable of enhanced visibility under fluoroscopy.
18. The apparatus of claim 1 wherein the first control rod and the second control rod comprise a substantially solid, semicircular cross-section, rather than being hollow, and C-shaped.
19. The apparatus of claim 1 wherein movement of the first control rod and the second control rod is determined by commands generated by a computer or robotic device.
20. The apparatus of claim 1 wherein the first control rod and the second control rod comprise a V-shaped lateral cross-section.
21. The apparatus of claim 1 wherein:
the first control rod and the second control rod are disposed between the outer tube and the inner tube.
22. The apparatus of claim 21 wherein:
the first control rod and the second control rod have arcuate transverse cross sections.