A pressure sensitive, self-adjustable port, comprising: a. a handle member comprising pressure sensitive actuation means; b. a shunt bobbin operably coupled to the handle member, the shunt bobbin comprising: a flanged sleeve member having an elongated annular proximal end and a flanged distal end having a flanged portion and a neck portion; and a telescopic concentric flanged cannula having a flanged distal end and an elongated proximal end, operably slidably coupled to the flanged sleeve member; c. an expanding anchor having a distal end and a proximal end, the proximal end of the expanding anchor being attached to the elongated proximal end of the telescopic concentric flanged cannula, and the distal end of the expanding anchor being attached to the proximal end of the sleeve member; and d. a perforating blade movable between an operational expanded position and a retracted stowed position, the perforating blade being operably coupled to the pressure sensitive actuation means, wherein the expanding anchor is configured to be biased towards the flanged portion and wherein, once actuated, the perforating blade is configured to retract upon entering a body cavity, wherein the flanged distal end of the flanged sleeve member defines a distally open cylindrical bore with a diameter configured to accommodate the flanged distal end of the telescopic concentric flanged cannula, and a floor defining a concentric proximal aperture having a diameter configured to accommodate the elongated proximal end of the telescopic concentric flanged cannula, wherein an adjusting biaser is disposed in the cylindrical bore defined in the flanged distal end of the flanged sleeve member between the flanged distal end of the telescopic concentric flanged cannula and the floor of the distally open cylindrical bore, wherein the neck portion of the distal end of the flanged sleeve member defines an external annular surface and an internal annular surface, the internal annular surface having a lip 203 configured to releasably engage at least one detent (102A, 102B) disposed on an outer surface of the proximal portion of the handle member such that, when the at least one detent (102A, 102B) is engaged with the lip, the expanding anchor is maintained in a stretched state and, when the at least one detent (102A, 102B) is disengaged from the lip, the biaser is configured to bias the flanged distal end of the telescopic concentric flanged cannula distally, causing the elongated proximal end of the telescopic concentric flanged cannula to slidably translate distally, and the expanding anchor to expand into an expanded state. a. a handle member comprising pressure sensitive actuation means; b. a shunt bobbin operably coupled to the handle member, the shunt bobbin comprising: a flanged sleeve member having an elongated annular proximal end and a flanged distal end having a flanged portion and a neck portion; and a telescopic concentric flanged cannula having a flanged distal end and an elongated proximal end, operably slidably coupled to the flanged sleeve member; c. an expanding anchor having a distal end and a proximal end, the proximal end of the expanding anchor being attached to the elongated proximal end of the telescopic concentric flanged cannula, and the distal end of the expanding anchor being attached to the proximal end of the sleeve member; and d. a perforating blade movable between an operational expanded position and a retracted stowed position, the perforating blade being operably coupled to the pressure sensitive actuation means, wherein the expanding anchor is configured to be biased towards the flanged portion and wherein, once actuated, the perforating blade is configured to retract upon entering a body cavity, wherein the flanged distal end of the flanged sleeve member defines a distally open cylindrical bore with a diameter configured to accommodate the flanged distal end of the telescopic concentric flanged cannula, and a floor defining a concentric proximal aperture having a diameter configured to accommodate the elongated proximal end of the telescopic concentric flanged cannula, wherein an adjusting biaser is disposed in the cylindrical bore defined in the flanged distal end of the flanged sleeve member between the flanged distal end of the telescopic concentric flanged cannula and the floor of the distally open cylindrical bore, wherein the neck portion of the distal end of the flanged sleeve member defines an external annular surface and an internal annular surface, the internal annular surface having a lip 203 configured to releasably engage at least one detent (102A, 102B) disposed on an outer surface of the proximal portion of the handle member such that, when the at least one detent (102A, 102B) is engaged with the lip, the expanding anchor is maintained in a stretched state and, when the at least one detent (102A, 102B) is disengaged from the lip, the biaser is configured to bias the flanged distal end of the telescopic concentric flanged cannula distally, causing the elongated proximal end of the telescopic concentric flanged cannula to slidably translate distally, and the expanding anchor to expand into an expanded state.