Journal of Computer Aided Surgery Vol.4 No.2
Abstract
We present a novel device to effciently harvest bone marrow in bone marrow
transplantation using newly proposed passive flexible drilling unit and
suction mechanism． The device is aimed at less invasive bone marrow harvesting
by collecting stem cells from the iliac bone with minimal punctures，less
operation time.The device consists of Stem Cell Harvesting Device with
Passive Flexible Drilling Unit．The device is inserted into the medullary
space from the iliac crest and aspirates the bone marrow while an end−mill
on the tip of the Passive Flexible Drilling Unit drills through the cancellous
bone to create a curved path．We found，from in vitro and in vivo plg study，that
the device can be inserted into the medullary space of the pig iliac bone
131mm by 32. 1mm／min and harvests bone marrow about 6 times as many per
puncture as the conventional Aspiration Method. The device，When applied
in clinical study，will enable less in vasiveness to donors by harvesting
graft from wider area of the iliac bone than conventional aspiration method．
Key words
Bone Marrow Transplantation，Drilling Cancellousbone，Flexible Device，Hematopoletic
Stem Cells．
Abstract
The purpose of this study is to apply 3-dimensional image to mandibular
movement data,and to discuss the clinical utility of this infomation. The
subject was a 26−yeas-old female of volunteer who has no missing teeth
and no morbid findings in clinicalexaminations. Prior to taking the computerized（CT),mandibular
movements weremeasured using POLARIS，an optical position measurement device
.The skull，mandibular and clutches were reconstructed into a 3-dimensional
image from the obtained CT data. The relationship markers and anatomic
structures were computed on CT irnaging．The movents in each region of
the anatomic structures were calculated using the data from the CT and
POLARIS．The 3-dimensional imaging on the computer monitor was synchronized
with the hurman movement by a real-time imagingsystem. The following fundamental
jaw movements were mainly investigated：qpening and closing motions，border
jaw movements in the sagittal plane and lateral excursion movements．In
intercuspal position and all sorts of mandibular movements，we could observevarious
condyle movements including the relationship of the position between the
condyle and the temporal bone.Therefore this information can be applied
to predict the regions of guide and loading each movement. There is a possibility
that it uncovers unprecedented movements and relationships between movements
and anatomic structures in patients with osteoarthritis.By using this system，we
could acquire much more infomation than by previous analysis of mandibular
movements．It was suggeste dthat 4-ehimensis would beuseful in studying
the pathogenesis of disease and convalescence in Tempromandibular disorders．
Key words
4-dimensional analysis，Mandibular movement,Three-dimensional imaging，Healthy volunteer.
Abstract
The concept of“Surgery Recording System”（SRS）for laparoscopy was
proposed and the first prototype was developed. The concepts of the system
are：the coordination for present surglcal environment，non−obstructive
sensor equipments’layout of surgeon's operations，the record of total
surgical information on time scale. First of all，the surgery recording
forceps was developed with which a6−DOF magnetic position sensor and a
6−axis force／torque sensor，efficently small and light weight， were
equipped．Position，orientation，force，torque informationsof the forceps
are recorded into a PC（hard disk drive）through the operation by a skillful
surgeon．The laparoscopic view imageand the expert's comments are also
recorded into a digital video tape．SRS was tested preliminary at in vivo
pig experimentand was able to record the above−mentioned significant surgical
data to the liver by an expert on laparoscopy.
Key words
Surgery Recording System，Surgery Recording Forceps，Laparoscopy，6−DOF
Magnetic Position Sensor，6−axis Force／Torque Sensor．