Linear Guides and Plastic Bearings Facilitate Motion for MRI-guided Robot

faithfulparsleyΛογισμικό & κατασκευή λογ/κού

2 Νοε 2013 (πριν από 3 χρόνια και 8 μήνες)

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press releas
e



EDITORIAL CONTACT
S
:

Courtney Toomey

|
Nikki Groom

Marketing Specialists

Call 401 438 2200

Email. ctoomey
@igus.com

|
ngroom@igus.com

IGUS, INC.

PO BOX 14349

East Providence
, RI 02914 USA

www.igus.com



L
inear
G
u
ides and Plastic Bearings F
acilitate
M
otion

for MRI
-
guided Robot



East Providence, RI
-

November 3, 2013


A

team of researchers from the Worcester Polytechnic Institute have developed a
teleoperated

robot that
will great
ly improve the way prostate cancer is detected and
treated
.

igus
®

donated
parts to the project at no cost, including
DryLin
®

l
inear guide
systems

and iglide
®

plastic plain bearing
s, which
facilitate
the robot’s
motion.


Prostate cancer is the second most
common cancer in North America and the leading type
of cancer found in males. Each year approximately 1.5 million core
-
needle biopsies are
performed, leading to a staggering 220,000 newly diagnosed cases of prostate cancer.

The
robotic system
is
specific
ally for prostate percutaneous procedures taking place under
magnetic resonance imaging (
MRI
)

guidance. The slave robot features a high
-
resolution
fiber optic sensor for prostate interventions with real
-
time in situ needle steering capability in
3
-
Tesla M
RI.


The
robot’s
needle placement robot consists of a 3
-
DOF Cartesian positioning module and
3
-
DOF needle driver module. DryLin T linear guides facilitate translational motion of the
positioning module, which provides gross positioning for the robot’s nee
dle driver. The
needle driver is a vital part of the system, as it enables the rotation and translational
movement of the needle cannula: a flexible tube inserted into the patient’s body cavity for
MRI
-
guided diagnosis and therapy.

-

more
-

press releas
e



EDITORIAL CONTACT
S
:

Courtney Toomey

|
Nikki Groom

Marketing Specialists

Call 401 438 2200

Email. ctoomey
@igus.com

|
ngroom@igus.com

IGUS, INC.

PO BOX 14349

East Providence
, RI 02914 USA

www.igus.com

The needle d
river has a needle guide sleeve, a collet locking mechanism and passive optical
tracking fiducial frame.

Two iglide A200 plastic plain bearings are used in the front and rear
of the driver to constrain the needle guide. The iglide bearings enable the rob
ot’s motor to
rotate the needle using the collet mechanism by way of a timing belt. This rotating needle
would reduce tissue damage while enhance targeting accuracy. Another 10 iglide bearings
were used to create a revolute joint, also known as a “pin joi
nt” or “hinge joint”, to provide
single
-
axis rotation.


A perfect picture with plastics

Since the robot operates inside a 3
-
Tesla, closed
-
bore MRI machine with only a 500
-
millimeter cylinder diameter, there were a number of elements that had to be taken in
to
consideration during the design process. Specifically for the robot’s mechanical system, the
components had to be non
-
ferrous for the patient’s safety during the radiation process, but
also compact due to the very limited installation space. Drylin T
linear guide systems and
iglide A200 plastic plain bearings were ideal for a number of reasons.


DryLin T linear guides are comprised of hard
-
anodized aluminum rails and carriages and
high
-
performance plastic sliding elements, which do not interfere with t
he MRI procedure.
The linear slides operate without messy lubrication, which is important in a sterile medical
environment. They also feature a lower
-
profile for applications where installation space is an
issue.


iglide A200 plastic plain bearings were
an obvious choice for the robot, as they are
comprised of FDA
-
compliant polymers specifically designed for applications with contact to
food or drugs. Like DryLin T, the iglide bearings also operate dry
-
running in order to prevent
contamination.


Hao Su,
PhD candidate and the lead of this project said, “There are very few products on the
market that both satisfied our requirements and delivered a good mechanical performance.
igus helped us address this issue by donating
its high
-
performance products
.”

-

m
ore
-

press releas
e



EDITORIAL CONTACT
S
:

Courtney Toomey

|
Nikki Groom

Marketing Specialists

Call 401 438 2200

Email. ctoomey
@igus.com

|
ngroom@igus.com

IGUS, INC.

PO BOX 14349

East Providence
, RI 02914 USA

www.igus.com


A
bout igus

igus develops industry
-
leading Energy Chain
®

cable carriers, Chainflex
®

continuous
-
flex
cables, iglide
®

plastic plain bearings, igubal
®

spherical bearings,
and
DryLin
®

linear bearings
and guide systems. These seemingly unrelated products

are linked together through a belief
in making functionally advanced, yet affordable plastic components and assemblies.
With
plastic bearing experience since 1964, cable carrier experience since 1971 and continuous
-
flex cable since 1989, igus provides the

right solution
from over

8
0,000 products available
from stock. No minimum order required. For more information, contact igus at (800) 521
-
2747 or visit www.igus.com.

###


igus,
Energy Chain, Chainflex, iglide, igubal, DryLin,
plastics for longer life, E
-
Chain, E
-
Chain System, Energy Chai
n Systems,
ReadyChain, Triflex
,
xiros, and
manus are registered trademarks of igus Inc. All other company names and products are
trademarks or registered trademarks of their respective companies.