Hypotube Shaft Design considers five key elements

• Push - the ability of a device to transmit a longitudinal force from the proximal end of the shaft to the distal end. When device shafts are designed to optimise push, it will be easier for the physician to manoeuvre the device to the exact treatment site.

• Torque - the ability of the device shaft to transmit a rotational displacement along the length of the device. Rotational movements by the physician translate exactly to the device tip within the anatomy when torque performance is high. 

• Kink Performance - is the ability of a device hypotube shaft to maintain it's cross sectional profile during compressive deformation.  When kink performance is high, the physician can rely on the device shaft to negotiate difficult routes without fracturing or breaking.

• Trackability - describes the ability of a device to travel through complex anatomies and is influenced by a number of factors including the shaft flexibility, strength and its friction within the anatomical environment. Trackability describes the "feel" of the device to the physician when manipulating and positioning the treatment device.

• Transition - refers to the change in stiffness along the device shaft. Physicians prefer a device shaft that is flexible at the distal end and stiff at the proximal end as it maximises the push and torque performance of the device. A well designed transition along the device shaft will also decrease the likelihood of kinking.

Hypotube Shafts - The design challenge
Design of the optimum hypotube shaft for your minimally invasive device requires balancing all of the above performance characteristics. Achieving the best performance in one characteristic can often directly affect other characteristics. This is where Creganna Medical Devices  can help. We have the experience and expertise to assist you in making these critical design decisions.

Design Guide
A design guide to designing hypotube shafts