Securing a guidewire delivery catheter in the coronary sinus using a mechanically releasing arm

A guidewire delivery catheter used to implant a shunt between the coronary sinus and the left atrium, the catheter comprising:

• a needle housed within the catheter in a delivery configuration, the needle configured to extend out of the catheter to puncture a vessel wall in a deployment configuration;
• a needle port through which the needle extends out of the catheter to transition from the delivery configuration to the deployment configuration;
• a securing mechanism housed within the catheter in a delivery configuration, the securing mechanism comprising a first compliant wire and a second compliant wire that are each configured to be advanced out of the catheter in a deployment configuration;
• a first wire port through which the first compliant wire of the securing mechanism extends out of the catheter to transition from the delivery configuration to the deployment configuration, the first wire port positioned distally of the needle port so that a distal end of the first compliant wire exits the catheter distal to the needle port;
• and
• a second wire port through which the second compliant wire of the securing mechanism extends out of the catheter to transition from the delivery configuration to the deployment configuration, the second wire port positioned distally of the needle port so that a distal end of the second compliant wire exits the catheter distal to the needle port,
• wherein each of the first compliant wire and the second compliant wire are configured to form a coil with a plurality of loops,
• wherein a coiled portion of the first compliant wire and a coiled portion of the second compliant wire are configured to come into contact with the vessel wall to provide wall apposition for the needle to puncture the vessel wall while the distal end of the first compliant wire and the distal end of the second compliant wire are configured to be spaced away from the vessel wall and to be outside of the guidewire delivery catheter.

A guidewire delivery catheter used to implant a shunt between the coronary sinus and the left atrium, the catheter comprising:

• a needle housed within the catheter in a delivery configuration, the needle configured to extend out of the catheter to puncture a vessel wall in a deployment configuration;
• a needle port through which the needle extends out of the catheter to transition from the delivery configuration to the deployment configuration;
• a securing mechanism housed within the catheter in a delivery configuration, the securing mechanism comprising a compliant wire configured to be advanced out of the catheter in a deployment configuration;
• and
• a wire port through which the compliant wire of the securing mechanism extends out of the catheter to transition from the delivery configuration to the deployment configuration, the wire port positioned distally of the needle port so that the compliant wire exits the catheter distal to the needle port,
• wherein the compliant wire includes a distal portion that extends from the wire port with a curved endcap at a distal end of the compliant wire so that the curved endcap of the compliant wire is configured to come into contact with the vessel wall to provide wall apposition for the needle to puncture the vessel wall,
• wherein the curved endcap is shaped to follow a curvature of a wall of the coronary sinus,
• wherein the curved endcap is shaped to follow a curvature of an outer surface of the guidewire delivery catheter at the wire port to cover the wire port in the delivery configuration.