Extravascular cuff with displaceable lateral restraint

An implantable extravascular pressure sensing system, comprising:

• a cuff including a first brace portion affixed to a second brace portion at a fixed distance and defining a longitudinal axis and a blood vessel receiving volume therebetween, the first brace portion defining a fluid chamber, the fluid chamber defining a recessed aperture;
• a first lateral restraint and a second lateral restraint disposed between the first brace portion and the second brace portion, the first lateral restraint and the second lateral restraint each defining a bore there through and being pliable and configured to be displaceable in a direction orthogonal to the longitudinal axis and to substantially enclose the blood vessel receiving volume;
• a diaphragm coupled to the fluid chamber and sealing the recessed aperture;
• a fluid disposed within the fluid chamber for exhibiting a hydraulic pressure in communication with the diaphragm;
• and
• a pressure sensor coupled to the first brace portion, the pressure sensor being configured to measure a change in the hydraulic pressure when a force is imparted on the diaphragm.

An implantable extravascular pressure sensing system, comprising:

• a cuff including a first brace portion affixed to a second brace portion and defining a longitudinal axis and a blood vessel receiving volume therebetween, the first brace portion defining a fluid chamber, the fluid chamber defining a recessed aperture;
• a first lateral restraint and a second lateral restraint disposed between the first brace portion and the second brace portion, the first lateral restraint and the second lateral restraint being pliable and being configured to be displaceable in a direction orthogonal to the longitudinal axis and to substantially enclose the blood vessel receiving volume;
• a first bracket and a second bracket, the first bracket and the second bracket being disposed on opposite sides of a pressure sensor and configured to affix the first brace portion to the second brace portion;
• the first lateral restraint and the second lateral restraint each including:
• a first portion configured to contact a blood vessel when a blood vessel is disposed within the blood vessel receiving volume;
• a second portion spaced a distance from the first portion by a necked portion, the second portion being configured to move within a portion of a respective one of the first bracket and the second bracket;
• and
• a bore extending through the first portion;
• a diaphragm coupled to the fluid chamber and sealing the recessed aperture;
• a fluid disposed within the fluid chamber for exhibiting a hydraulic pressure in communication with the diaphragm;
• and
• the pressure sensor coupled to the first brace portion, the pressure sensor being configured to measure a change in the hydraulic pressure when a force is imparted on the diaphragm.