0
Research Papers

Improving Maneuverability and Tactile Feedback in Medical Catheters by Optimizing the Valve Toward Minimal Friction

[+] Author and Article Information
S. K. Ravensbergen

Department of Mechanical Engineering, Eindhoven University of Technology, NL-5600-MB Eindhoven, The Netherlandss.k.ravensbergen@tue.nl

P. C. J. N. Rosielle, M. Steinbuch

Department of Mechanical Engineering, Eindhoven University of Technology, NL-5600-MB Eindhoven, The Netherlands

J. Med. Devices 3(1), 011003 (Jan 08, 2009) (4 pages) doi:10.1115/1.3054389 History: Received October 29, 2008; Revised November 14, 2008; Published January 08, 2009

A new extended hemostasis valve for sheaths is presented, with minimized stick-slip behavior to be used in (heart) catheterization procedures during long interventions (3–6 h). The invented extension to this existing sheath bypasses the silicone rubber sealing (hemostasis valve) and replaces it with a dedicated seal with the two functions separated: (1) sealing around the catheter being used and (2) closing the sheath when the catheter is removed (valve function). Measurements have been performed on the current and the invented seals, showing that the axial friction force is reduced, with a factor of 6.4, from 1.4 N to 0.22 N.

FIGURES IN THIS ARTICLE
<>
Copyright © 2009 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Insertion of the ablation catheter in the groin area and moved toward the heart via the inferior vena cava or inserted in the neck and via the superior vena cava

Grahic Jump Location
Figure 2

Cardiac ablation catheter, normally 1100–1300 mm in length and 7 French (2.33 mm) in diameter. The handle contains a knob for bending the tip and a connector for electronics and flushing. The sheath length is 500–600 mm with an 8–9 French (2.7–3.0 mm) inner and 9–10 (3.0–3.3 mm) outer diameter. Also the improved valve and seal are indicated.

Grahic Jump Location
Figure 3

Normal and X-ray pictures of an existing sheath (St. Jude Medical (9)) with silicone rubber seal, flush channel, and the sheath (containing a braiding of stainless wires)

Grahic Jump Location
Figure 4

Friction optimized sheath, figures from Ref. 12.

Grahic Jump Location
Figure 5

The hemostasis valve setup showing the separate surrounding seal, used when the catheter tube is inserted (function (1)), and the closure valve, used when the catheter is removed (function (2)). The whole setup is inserted into an existing tight high friction hemostasis valve and locked on its housing.

Grahic Jump Location
Figure 6

The improved hemostasis valve with ablation catheter

Grahic Jump Location
Figure 7

Systematic view of the closing valve showing the door with torsion spring in closed (left: φ=0 deg, ϑ=36 deg, and Mdoor=2.4 N mm) and opened (right: φ=70 deg, ϑ=52 deg, and M=1.8 N mm) positions

Grahic Jump Location
Figure 8

Analytical model of the closing valve: (left) the spring deflection angle ϑ(deg), and (right) the moment on the door M(N mm), caused by the spring—as function of the door aperture angle φ (deg)

Grahic Jump Location
Figure 9

Exploded view of the closing valve showing the door with torsion spring in opened position

Grahic Jump Location
Figure 10

Exploded view of the surrounding seal with the bayonet coupling and the 12 crescent-shaped PTFE disks. Their hole corresponds to the catheter diameter.

Grahic Jump Location
Figure 11

Measurement setup, where the sheath is clamped on two places and the catheter tip is pushed with a dial gauge

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In