A shell cuff

A method of manufacturing a shell cuff, the method comprising injection moulding the first material and the second material to form a sheet, and thermoforming the sheet to form a shell cuff, wherein the shell cuff comprises the sheet comprising a first face and an opposing second face, the sheet being curved such that a first end of the sheet and an opposing second end of the sheet overlap to form an overlapping portion in which a first interface portion of the first face interfaces with a second interface portion of the second face, and wherein:

• the second face is defined by a second residual portion and the second interface portion, wherein the second interface portion is flush with the second residual portion,
• the sheet is configured to be tightened on application of force so as to increase the size of the overlap between the first face and the second face,
• the first interface portion is made from a first material and the second interface portion is made from a second material which is different to the first material,
• the first material at the first interface portion extends through more than 20% of the thickness of the sheet, the second material at the second interface portion extends through more than 20% of the thickness of the sheet,
• the sensor pad is filled with liquid to measure hemodynamic parameter.

A method of manufacturing a shell cuff, the method comprising extruding the first material and the second material to form a sheet having at least two extruded layers, and thermoforming the sheet to form the shell cuff, wherein the shell cuff comprises the sheet comprising a first face and an opposing second face, the sheet being curved such that a first end of the sheet and an opposing second end of the sheet overlap to form an overlapping portion in which a first interface portion of the first face interfaces with a second interface portion of the second face, and wherein:

• the second face is defined by a second residual portion and the second interface portion, wherein the second interface portion is flush with the second residual portion,
• the sheet is configured to be tightened on application of force so as to increase the size of the overlap between the first face and the second face,
• the first interface portion is made from a first material and the second interface portion is made from a second material which is different to the first material,
• the first material at the first interface portion extends through more than 20% of the thickness of the sheet, the second material at the second interface portion extends through more than 20% of the thickness of the sheet,
• the sensor pad is filled with liquid to measure hemodynamic parameter, and
• the sheet comprises a first layer comprising the first material which forms the first face;
• and a second layer comprising the second material which forms the second face.