Sina Keshavarz

12 Questions 7 Answers 0 Followers

Questions related from Sina Keshavarz

What is the typical speed of steering a steerable catheter by a cardiovascular interventionist?

Let’s say a clinician is using a steerable catheter and we want to see the range of velocities the clinician manipulates the steering module with. Are there any references citing this?

18 June 2024 4,249 0 View

What is the acceptable range of forces required to advance a delivery sheath to crimp a self-expandable nitinol stent for cardiovascular intervention?

Clinicians need to crimp the self-expandable stents into a delivery sheath so they can deploy it at a target site. I want to know if there are any researchers out there discussing the amount and...

18 June 2024 5,237 0 View

What is the acceptable range for movement/deflection of anchoring points (reconfigurable anchor points) for a cable-driven parallel robot/mechanism?

I am working with a cable-driven parallel mechanism where the cables pass through anchoring points and connect to an end-effector manipulated by the user. In my setup, these anchoring points are...

15 May 2024 9,400 0 View

How to extract nitinol's superelastic parameters based on Auricchio's model?

I have done a stress-strain test and it looks like the picture attached. However, in here, I only have upper and lower plateau stresses. In Auricchio's model for the superelastic behavior of...

04 April 2024 9,536 3 View

Stent radial force requried to cause damage to artery wall intima?

I am working on the measurement of radial forces exerted by self-expandable cardiovascular stents. I need to know how much force can damage the intima of arterial walls? Please refer me to a...

01 April 2024 1,751 5 View

What are the best welding configuration for welding a cylindrical tube to a flat surface?

I'm welding (laser welding) a nitinol cylindrical tube to a nitinol flat surface, and I am evaluating three methods for the laser welding configuration (as depicted below): I) using a groove on...

27 March 2024 3,975 6 View

Fluid mechanics of air embolism and blood leakage through arterial catheterization interventions?

How can I calculate the risk of air embolism or blood leakage when using a microchannel catheter (polyimide, ID ~ 0.015") in femoral arteries, considering the pressure differences and factors like...

08 March 2024 286 0 View

Which company fabricates the best Protein G magnetic beads for antibody purification?

I intend to buy Protein G magnetic beads and since their prices are almost equal (approx. 200$/mL), I was wondering which company produces better beads among ThermoFisher Scientific, Cytivia (GE...

11 October 2020 1,714 6 View

While simulating my MSC Adams model, I encountered the error below. Could anyone help me with this?

ERROR: A Not-a-Number (NaN) value was computed for the integration error. This problem may be related to wrong values computed by user-written subroutines. Please try using the Adams utility...

10 August 2018 7,927 1 View

How can I transfer data between AVR microcontrollers-ATMega32 and MATLAB-PC Software?

I have the equipment needed to make the connections between my atmega32 and my pc. I just don't know how to give data to matlab to design apt PID controller for my device.

27 May 2018 6,207 5 View

What is the degree of Plasticization?

I have been reading an article about shape memory alloy actuator design. The martensite stress-strain diagram is modeled into 2 elastic and pseudo-plastic bilinear paths. I have come to some...

22 May 2018 1,484 3 View

Is there any method to find C:damping coefficient of a system (ie. SMA actuator) in theory using no experimental methods(ie. logarithmic decrement)?

I am trying to design a Shape Memory Alloy Actuator and I intend to find the damping coefficient C before fabricating the actuator. Is it possible to find damping coefficient without utilizing any...

23 April 2018 5,863 13 View