Transseptal access device and method of use
Systems, devices, and methods are provided for transseptal access of septa within a patient. The device can be advanced to a septum, e.g., towards a fossa ovalis. Instead of applying positive pressure to “tent” the septum, a negative pressure is applied to a lumen within a sheath, e.g., within an elongated member slidable within the sheath, via a negative pressure source such as a syringe on the proximal end of the sheath. This results in the septum pulling inward. The sheath employs a stationary needle-like central core component contained within the lumen of the sheath that punctures the septum when the same is pulled passed it by the negative pressure. The stationary needle-like central core component may be hollow and may form a portion of the elongated member or may be coupled to a distal end thereof.
1. An assembly for transseptal access, comprising:
a steerable sheath including an elongated member having a proximal end and a distal end;
an inflatable funnel coupled to and surrounding the elongated member at the distal end, the inflatable funnel substantially collapsed against the elongated member in a retracted configuration, the inflatable funnel further having an inflated configuration having a proximal end with a first radius and a distal end with a second radius, the second radius greater than the first radius, the inflated configuration caused by inflation through an inflation lumen;
such that the elongated member and the inflatable funnel are configured to be delivered to a septal location, and such that upon inflation the funnel is configured to transition from the retracted configuration to the inflated configuration; and
a piercing element movable in distal and proximal directions through the elongated member, the piercing element configured to pierce the septum when the funnel is in the inflated configuration and when the funnel is contacting the septum, the piercing element including an activatable radio frequency element,
such that the inflatable funnel provides a stable base for a transseptal puncture to occur, and is stiff when inflated but collapsible during delivery and retraction and wherein the inflatable funnel is comprised of a soft durometer polymer and is formed by folding the polymer back on itself.
2. The assembly of claim 1 , wherein the first radius is between about 3 French to 10 French and the second radius is between about 2.5 mm and 15 mm.
3. The assembly of claim 2 , wherein the first radius is between about 5 French to 8 French and the second radius is between about 5 mm and 10 mm.
4. The assembly of claim 1 , wherein the elongated member or the funnel or the piercing element further comprises a radioopaque element.
5. The assembly of claim 1 , wherein the assembly further comprises a dilator.
6. The assembly of claim 1 , wherein the elongated member has further defined a guidewire lumen therein, the guidewire lumen extending from the proximal end to the distal end.
7. The assembly of claim 1 , wherein the piercing element is on a distal end of a dilator, is hollow, or is disposed off-axis relative to an axis of the elongated member.
8. The assembly of claim 1 , further comprising a governor configured to move the piercing element against the septum and to inhibit movement of the piercing element past a pre-specified point.
9. The assembly of claim 1 , wherein the polymer of the inflatable funnel has a memory or an inherent geometric shape, to help the inflatable funnel deploy into the inflated configuration upon inflation.
10. The assembly of claim 1 , further comprising an ultrasound element to visualize transseptal access locations prior to puncture.
11. The assembly of claim 1 , wherein the piercing element is coupled to a reinforced polymer to transmit forces such as a push and pull needed for puncture.
12. The assembly of claim 1 , wherein the distal end of the transseptal assembly includes a metallic band encircling a polymer tip, or includes a radioopaque compounded polymer.
13. An assembly for transseptal access, comprising:
a steerable sheath including an elongated member having a proximal end and a distal end; and
an inflatable funnel coupled to and substantially surrounding the elongated member at the distal end, the inflatable funnel substantially collapsed against the elongated member in a retracted configuration, the inflatable funnel further having an expanded configuration when inflated through an inflation lumen, the expanded configuration having a proximal end with a first radius and a distal end with a second radius, the second radius greater than the first radius; and
a piercing element including an activatable radio frequency element disposed on a dilator movable in distal and proximal directions through the elongated member, the radio frequency element configured to puncture transseptal tissue when activated,
such that the inflatable funnel provides a stable base for a transseptal puncture to occur, and is stiff when inflated but collapsible during delivery and retraction, wherein the inflatable funnel is comprised of a soft durometer polymer, and wherein the inflatable funnel is formed by folding the polymer back on itself.
14. The assembly of claim 13 , wherein the elongated member or the funnel or the piercing element further comprises a radioopaque element.
15. The assembly of claim 13 , wherein the piercing element is hollow or is disposed off-axis relative to an axis of the dilator.
16. The assembly of claim 13 , further comprising a governor configured to move the piercing element against the septum and to inhibit movement of the piercing element past a pre-specified point.
17. The assembly of claim 13 , wherein the polymer of the inflatable funnel has a memory or an inherent geometric shape, to help the inflatable funnel deploy into the inflated funnel configuration upon inflation.