Methods and devices for passive residual lung volume reduction and functional lung volume expansion
The volume of a hyperinflated lung compartment is reduced by sealing a distal end of the catheter in an airway feeding the lung compartment. Air passes out of the lung compartment through a passage in the catheter while the patient exhales. A one-way flow element associated with the catheter prevents air from re-entering the lung compartment as the patient inhales. Over time, the pressure of regions surrounding the lung compartment cause it to collapse as the volume of air diminishes. Residual volume reduction effectively results in functional lung volume expansion. Optionally, the lung compartment may be sealed in order to permanently prevent air from re-entering the lung compartment.
1. A system for detecting collateral ventilation into a lung compartment in a patient, said system comprising:
a catheter adapted to be introduced transtracheally to an airway leading to a target lung compartment, wherein the catheter comprises a distal end, a proximal end, and at least one lumen extending from the distal end to the proximal end;
an occlusion member on a distal region of the catheter, said occlusion member being adapted to selectively occlude the airway such that access to the compartment is provided only through the lumen of the catheter;
a one-way flow element adapted to be disposed within or in-line with the lumen so that flow in a distal-to-proximal direction is allowed and flow in a proximal-to-distal direction is inhibited or prevented;
a flow-measurement device connectable to the catheter, wherein the flow-measurement device is configured to measure air flow or accumulation from the catheter over time; and
a processor configured to detect collateral ventilation based on the measured air flow or accumulation from the catheter over time.
2. A system as in claim 1 , wherein the flow-measurement device comprises a slack collection bag.
3. A system for evaluating a target lung compartment comprising:
catheter positionable within a lung passageway leading to the target lung compartment, wherein the catheter comprises a distal end, a proximal end, and at least one lumen extending from the distal end to the proximal end;
an occlusion member on a distal region of the catheter configured to isolate the target lung compartment;
a one-way flow element adapted to be disposed within or in-line with the lumen so that flow in a distal-to-proximal direction is allowed and flow in a proximal-to-distal direction is inhibited or prevented;
at least one sensor which generates measurement data reflecting pressure within the target lung compartment; and
a processor which performs computations with the use of the measurement data reflecting pressure within the target lung compartment and is configured to detect collateral ventilation based upon said computations.
4. The system as in claim 3 , wherein the computations include calculating a degree of hyperinflation of the target lung compartment.
5. The system as in claim 3 , wherein the computations include calculating a state of compliance of the target lung compartment.
6. The system as in claim 3 , wherein the computation includes calculating collateral, resistance of the target lung compartment.
7. The system as in claim 3 , wherein the system is configured to generate a plurality of measurements of pressure over a predetermined time period.
8. The system as in claim 3 , wherein the system is configured to inject a compound into the target lung segment to block collateral flow channels.