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A METHOD FOR ASSEMBLING MICROMECHANICAL DEVICES USING ONE OF MAGNETIC FIELD OR LIQUID SURFACE TENSION

IP.com Disclosure Number: IPCOM000007388D
Original Publication Date: 1995-Mar-01
Included in the Prior Art Database: 2002-Mar-21
Document File: 7 page(s) / 231K

Publishing Venue

Motorola

Related People

Keith E. Wiek: AUTHOR [+3]

Abstract

Surgery is now being performed on a much smaller scale than was ever thought possible. Micro- surgery is already being used for a number ofappli- cations including: (1) radial keratotomy eye surgery, (2) nerve and tendon reattachment surgery, and (3) vasectomy and tubal ligation reversal surgeries. Cos- metic surgery is another important field where micro- scopic and tine scale surgery is becoming more com- mon. One ofthe major challenges faced in microsur- gery and cosmetic surgery is the closing and heal- ing of surgical and other wounds without scarring. The invention presented here provides the micro sur- geon with a means of attaching pieces of flesh-a means which will securely bind a wound together and promote healing. Staples are already in use in many types of surgery. The microsurgical staples pro- posed here are a dramatic improvement over con- ventional technology because they are spring loaded and do a better job of keeping a wound closed, and they are so small that they will leave little or no scarring.

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MOTOROLA Technical Developments Volume 24 March 1995

A METHOD FOR ASSEMBLING MICROMECHANICAL DEVICES USING ONE OF MAGNETIC FIELD OR LIQUID SURFACE TENSION

by Keith E. Wiek (Intellectual Property Department), Jon T Fitch (Advanced Product Research and Development Laboratory), Papu D. Maniar (Advanced Materials Group), Motorola Inc.

  Surgery is now being performed on a much smaller scale than was ever thought possible. Micro- surgery is already being used for a number ofappli- cations including: (1) radial keratotomy eye surgery,
(2) nerve and tendon reattachment surgery, and (3) vasectomy and tubal ligation reversal surgeries. Cos- metic surgery is another important field where micro- scopic and tine scale surgery is becoming more com- mon. One ofthe major challenges faced in microsur- gery and cosmetic surgery is the closing and heal- ing of surgical and other wounds without scarring. The invention presented here provides the micro sur- geon with a means of attaching pieces of flesh-a means which will securely bind a wound together and promote healing. Staples are already in use in many types of surgery. The microsurgical staples pro- posed here are a dramatic improvement over con- ventional technology because they are spring loaded and do a better job of keeping a wound closed, and they are so small that they will leave little or no scarring.

  Various references for the technologies used in fabricating micromechanical surgical staples are given below. For example, it is well known that thin films can be sputtered/deposited with a wide range of stress

levels (from 5.OE9 dynes/cm2 tensile to as high as lSEi0 dynes/cm2 compressive) [l, 21. Because of this as-deposited stress, these films would curl if they were exfoliated from their substrates. We often see this phenomena in wafer fab in sputtered metal layers which lifl and peel. These tilms can be used to form spring loaded beams. The mathematics ofbeam bend- ing needed to do so are very well developed [3]. Another important fabrication method for microma- chining is the LIGA technique [4]. Typically LlGA uses a photosensitive polymer and an advanced lithography technique (such as x-ray) to form a mold cavity. This mold cavity is then filled with a metal by electroplating or by sputtering and etchback. A number of isotropic etching techniques have been developed for making sharply pointed structures for

0 Motorola. 1°C. 1995

field emission tips and nozzles [5]. These techniques could easily be adapted for making sharpened points on the staples. Other bio-medical applications for micromachining are now being published [6,7].

FIGURES DESCRIBED

  Spring loaded micromechanical surgical staples will provide an important new tool for micro- and cosmetic surgery. The staples are unique in that the backbone ofthe staples is spring loaded. The staples are fabricated with this backbone attached a water soluble substrate such as NaCl or GeOz. A large number of the staples can be fabricated in a...