Surgical instruments consist of basic mechanical components such as gears, links, pivots, sliders, etc., which are common in mechanical design. This paper describes the application of a method in the analysis and design of complex surgical instruments such as those employed in laparoscopic surgery. This is believed to be the first application of type synthesis theory to a complex medical instrument. Type synthesis is a methodology that can be applied during the conceptual phase of mechanical design. A handle assembly from a patented laparoscopic surgical stapler is used to illustrate the application of the design method developed. Type synthesis is applied on specific subsystems of the mechanism within the handle assembly where alternative design concepts are generated. Chosen concepts are then combined to form a new conceptual design for the handle assembly. The new handle assembly is improved because it has fewer number of parts, is a simpler design and is easier to assemble. Surgical instrument designers may use the methodology presented here to analyze the mechanical subsystems within complex instruments and to create new options that may offer improvements to the original design.

Issue Section:
Technical Papers
Keywords:
surgery, biomedical equipment, design engineering
Topics:
Design, Gears, Instrumentation, Kinematics, Manufacturing, Surgical tools, Surgery, Design engineering, Springs
1.
Vitale, G. C., Sanfilippo, J. S., and Perissat, J., 1995, Laparoscopic Surgery: An Atlas for General Surgeons, J. B. Lippincott Company.
2.
Sandor, G. N., and Erdman, A. G., 1984, Advanced Mechanism Design: Analysis and Synthesis, Vol 2, Prentice Hall, (a) “Planar Kinematic Pairs-Link Joints,” pp. 21, (b) “Kinematic Diagrams,” pp. 5–14, (c) “Tasks of Kinematic Synthesis,” pp. 52–63, (d) “Six-Bar Chains,” pp. 14–15.
3.
Soni, A. H., 1974, Mechanism Synthesis and Analysis, R. E. Krieger Pub. Co., pp. 3–10.
4.
Titus, J. E., Erdman, A. G., and Riley, D. R., 1990, “Techniques of Type Synthesis of Mechanisms.” 1990 NSC-NSF Joint Seminar on Recent Developments in Mechanical Design, National Cheng Kong University, Tainan, Taiwan.
5.
Erdman, A. G., and Sandor, G. N., 2001, Mechanism Design: Analysis and Synthesis, Vol 1, Prentice Hall, (a) “Degrees Of Freedom,” pp. 21–30, (b) “Mechanical Advantage,” pp. 165–176.
6.
Crossley, F. R. E., 1965, “The Permutation of Kinematic Chains of 8 Members or Less from the Graph-Theoretic Viewpoint,” Developments in Theoretical and Applied Mechanics, Vol 2, Pergamon Press, Oxford, pp. 467–486.
7.
Freudenstein, F., and Maki, E. R., 1979, “The Creation of Mechanism according to Kinematic Structure and Function,” General Motors Research Laboratories, GMR-3073, September 11.
8.
Harary, F., 1969, Graph Theory, Addison-Wesley, Reading, Mass.
9.
Hsu, C. H., 1992, “An Application of Generalized Kinematic Chains to the Structural Synthesis of Non-Fractionated Epicyclic Gear Trains,” ASME Mechanisms Conf., DE-Vol. 46, pp. 451–458.
10.
Hsu
,
C. H.
, and
Wu
,
Y. C.
,
1998
, “
A Methodology for Systematic Synthesis of Two-DOF Gear Differentials
,”
JSME Int. J., Ser. C
,
41
(
2
), pp.
299
–
306
.
11.
Yan
,
H. S.
, and
Hsieh
,
L. C.
,
1994
, “
Conceptual Design of Gear Differential for Automotive Vehicles
,”
ASME J. Mech. Des.
,
116
, pp.
565
–
570
.
12.
Yan
,
H. S.
, and
Chen
,
J. J.
,
1975
, “
Creative Design of a Wheel Damping Mechanism.
”
Mech. Mach. Theory
,
10
, Pergamon Press, Oxford, pp.
375
–
383
.
13.
Johnson, R. C., 1978, Mechanical Design Synthesis-Creative Design and Optimization, Krieger, Huntington, N.Y.
14.
Mruthyunjaya
,
T. S.
, and
Raghavan
,
M. R.
,
1984
, “
Computer Aided Analysis of the Structure of Kinematic Chains
,”
Mech. Mach. Theory
,
19
, pp.
357
–
368
.
15.
Mruthyunjaya
,
T. S.
, and
Balasubramanian
,
H. R.
,
1987
, “
In Quest of a Reliable and Efficient Computational Test for Detection of Isomorphism in Kinematic Chains
,”
Mech. Mach. Theory
,
22
, pp.
131
–
139
.
16.
Tuttle, E. R., Peterson, S. W., and Titus, J. E., 1998, “Further Application of Group Theory to the Enumeration and Structural Analysis of Basic Kinematic Chains,” Trends and Developments in Mechanisms, Machines, and Robotics-1988, Vol. 1, ASME Design Technology Conference, Kissimmee, Fla. pp. 173–177.
17.
Uicker
,
J. J.
, and
Raicu
,
A.
,
1975
, “
Method for the Identification and Recognition of Equivalence of Kinematic Chains
,”
Mech. Mach. Theory
,
10
, Pergamon Press, Oxford, pp.
375
–
383
.
18.
Mastri, D. L., Viola, F. J., Alesi, Jr, T. W., and Geiste, R. J., 1998 “Surgical Stapler,” United States Patent, patent number: 5,762,256, date of patent: June 9th.
19.
Woodson, W. E., 1981, Human Factors Design Handbook, McGraw Hill, New York, (a) “Tools-Guidelines for Design/Selection,” pp. 657–674, (b) “Human Strength-Hand Dynamometer Strength,” pp. 773.
20.
Midha, A., Norton, T. W., and Howell, L. L., 1992, “On the Nomenclature and Classification of Compliant Mechanisms: Abstractions of Mechanisms and Mechanism Synthesis Problems,” Flexible Mechanisms, Dynamics, and Analysis, ASME DE-Vol. 47, pp. 225–235.
21.
Lim, J. B., 2001, “Type Synthesis of a Complex Surgical Device,” M. S. Thesis, Department of Mechanical Engineering, University of Minnesota, pp. 49–54.
22.
Burns, R. H., and Crossley, F. R. E., 1966, “Structural Permutations of Flexible Link Mechanisms,” ASME Paper No. 66-Mech-5.
23.
Her
,
I.
, and
Midha
,
A.
,
1987
, “
A Compliance Number Concept for Compliant Mechanisms, and Type Synthesis
,”
ASME, J. Mech. Trans Auto. Des.
109
, pp.
348
–
355
.
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