Surgical devices and methods
A medical introducer includes an elongated tubular member having a proximal end, a distal portion, and a central lumen extending from the proximal end to a distal port in the distal portion. A frame structure is coupled to the distal portion of the elongated tubular member, where frame structure supports the distal portion of the elongated tubular member in a tapered shape and alternatively in a non-tapered shape. The elongated tubular member may include a rigid outer tube and a rigid inner tube carried in an interior lumen of the outer tube. The distal portion is typically a reinforced elastomeric tubular extension of the outer tube, and the reinforced elastomeric tubular extension may have a conical shape.
1. A medical device comprising:
a handle;
an elongated tubular member adapted for introduction into a body lumen of a patient;
a central passageway within a distal portion of the tubular member;
a treatment tool that is extendable and retractable from the central passageway;
an imaging device disposed in the central passageway; and
an atraumatic tip coupled to a distal portion of the tubular member, said atraumatic tip having a tapered configuration for introduction in the body lumen and a non-tapered configuration to allow extension of the treatment tool distally from the tubular member, and where the atraumatic tip comprises a frame structure formed of a shape memory material having a conical shape memory to provide the tapered configuration and expendable to a cylindrical shape to provide the non-tapered configuration;
wherein the elongated tubular member comprises an outer tube and an inner tube carried in an interior lumen of the outer tube and wherein the frame structure is coupled to a distal end of the outer tube; and
wherein an annular space between an inner surface of the outer tube and an outer surface of the inner tube of the elongated tubular member is configured to be coupled to a negative pressure source via the handle.
2. The medical device of claim 1 , further comprising an elastomeric material disposed over the frame structure.
3. The medical device of claim 2 , wherein the frame is embedded in the elastomeric material.
4. The medical device of claim 2 , wherein the elastomeric material is substantially transparent.
5. The medical device of claim 1 , wherein atraumatic tip is moved from the tapered configuration to the non-tapered configuration by relative axial movement of the inner tube and outer tube.
6. The medical device of claim 5 , wherein the central passageway tapers to a distal port having a lesser diameter in its tapered configuration than in its non-tapered configuration.
7. The medical device of claim 1 , wherein a distal portion of the outer tube is perforated.
8. The medical device of claim 1 , wherein the tubular member includes an interior channel communicating with a fluid inflow source.
9. The medical device of claim 1 , wherein the tubular member includes an interior channel communicating with a pressure sensor.
10. The medical device of claim 1 , further comprising an actuator in the handle for causing relative axial movement of the inner tube and outer tube.
11. The medical device of claim 1 , wherein the frame structure comprises a zig-zag structure with a plurality of struts joined at distal apices and proximal apices wherein the proximal apices are joined to a base ring attached to the distal end of the outer tube.
12. The medical device of claim 1 , wherein the tool is an RF surgical tool.