Metallurgical analysis of aneurysm and microvascular clips

1978 ◽  
Vol 48 (4) ◽  
pp. 614-621 ◽  
Author(s):  
W. Bradford DeLong ◽  
Robert L. Ray
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Precipitation Hardening ◽  
General Corrosion ◽  
Content Type ◽  
Aneurysm Clip ◽  
Metallurgical Analysis ◽  
Different Types ◽  
Microvascular Clip ◽  
Fine Print

✓ The design of an aneurysm clip and the choice of its component materials require complex considerations of corrosion resistance, biocompatibility, desired performance, and manufacturing practicalities. This study analyzed 10 different types of aneurysm and microvascular clips for chemical composition and metallurgical characteristics. The opening force of each clip was determined with a spring gauge. All components of four multicomponent clips (three aneurysm clips and one microvascular clip) were manufactured from 17-7PH stainless steel, a strong precipitation-hardening grade of good general corrosion resistance. Two multicomponent clips (one aneurysm clip and one microvascular clip) each contained three components manufactured from different alloys. In an implanted clip, an increased rate of corrosion may result from electrolytic reaction between components composed of different alloys. This study demonstrated that 17-7PH stainless steel is a popular alloy for use in vascular clips, but it has several drawbacks. The authors suggest that manufacturers explore the use of PH15-7Mo instead. PH15-7Mo is another precipitation-hardening stainless steel, but contains molybdenum, which renders it potentially more resistant to corrosion than 17-7PH.

Magnetic resonance imaging and aneurysm clips

1989 ◽  
Vol 70 (3) ◽  
pp. 426-431 ◽  
Author(s):  
Bertil Romner ◽  
Magnus Olsson ◽  
Bengt Ljunggren ◽  
Stig Holtås ◽  
Hans Säveland ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Mr Imaging ◽  
Image Artifacts ◽  
Resonance Imaging ◽  
Content Type ◽  
Aneurysm Clip ◽  
Different Types ◽  
Mr Artifacts ◽  
Fine Print

✓ The magnetic properties of 12 different types of aneurysm clip were investigated in order to identify which clips allow postoperative magnetic resonance (MR) imaging without risk. Clip-induced MR artifacts were also quantitatively studied using a geometrical phantom. Nonferromagnetic aneurysm clips like the Yaşargil Phynox, Sugita Elgiloy, and Vari-Angle McFadden clips do not appear to contraindicate MR studies performed with a FONAR β-3000M imager. There is no clip movement upon introduction of the phantom into the MR imager, and the image artifacts caused by the clips are so limited that patients harboring such clips may well be considered for MR imaging. This examination may reveal information not obtainable by any other radiological modality.

Surface white spot and pitting corrosion of 316 L stainless steel

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Guanghui Yi ◽  
Dajiang Zheng ◽  
Guang-Ling Song
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Pitting Corrosion ◽  
Electrochemical Impedance ◽  
White Spot ◽  
General Corrosion ◽  
Corrosion Performance ◽  
Content Type ◽  
White Spots ◽  
316 L Stainless Steel

Purpose The purpose of this paper is to address the concern of some stainless steel users. To understand the effect of surface white spots on corrosion performance of stainless steel. Design/methodology/approach White spots appeared on some component surfaces made of 316 L stainless steel in some industrial applications. To address the concern about the pitting performance in the spot areas, the pitting corrosion potential and corrosion resistance were measured in the spot and non-spot areas by means of potentiodynamic polarization and electrochemical impedance spectroscopy and the two different surface characteristics were analytically compared by using optical microscopy, laser confocal microscopy, scanning electron microscopy, x-ray diffraction, energy dispersive spectroscopy and auger energy spectroscopy. The results indicated that the pitting performance of the 316 L stainless steel was not negatively influenced by the spots and the white spots simply resulted from the slightly different surface morphology in the spot areas. Findings The white spots are actually the slightly rougher surface areas with some carbon-containing species. They do not reduce the pitting resistance. Interestingly, the white spot areas even have slightly improved general corrosion resistance. Research limitations/implications Not all surface contamination or roughening can adversely affect the corrosion resistance of stainless steel. Practical implications Stainless steel components with such surface white spots are still qualified products in terms of corrosion performance. Originality/value The surface spot of stainless steel was systematically investigated for the first time for its effect on corrosion resistance and the conclusion was new to the common knowledge.

A simple hemostatic method using a metal shield for injury of a major cerebral artery

1982 ◽  
Vol 57 (3) ◽  
pp. 323-327 ◽  
Author(s):  
Akira Yokoo ◽  
Kenichiro Sugita ◽  
Shigeaki Kobayashi ◽  
Koichi Matsuo
Keyword(s):  
Stainless Steel ◽  
Clinical Application ◽  
Cerebral Artery ◽  
Outer Surface ◽  
Cerebral Arteries ◽  
Content Type ◽  
Aneurysm Clip ◽  
Metal Shield ◽  
Injured Artery ◽  
Fine Print

✓ A new hemostatic method has been devised that uses a metal shield for treating accidentally injured major cerebral arteries. The metal shield is made of stainless steel, and has a small plate on its outer surface that allows it to be held in a regular aneurysm clip holder. Three different sizes of shield are available. The metal shield is applied to an injured artery with Oxycel and Biobond and held for a few minutes. Bleeding stops instantaneously. This is a simple and effective hemostatic method for an injured artery of small size. Experimental results and clinical application of this method are described.

Biocompatibility analysis of the Sundt-Kees booster clip and the Drake aneurysm clip

1985 ◽  
Vol 63 (6) ◽  
pp. 980-984 ◽  
Author(s):  
Robert E. Anderson ◽  
Alice M. Bowron ◽  
Thoralf M. Sundt
Keyword(s):  
Stainless Steel ◽  
Content Type ◽  
Aneurysm Clip ◽  
Fine Print

✓ A combination of the Sundt-Kees reinforcing aneurysm clip applied to a Drake aneurysm clip in a piggyback fashion was studied for possible defects due to corrosion and or tissue toxicity. These two clips, which are made of similar metal (301 stainless steel), showed little or no defects when immersed in 5% saline or when implanted in rats for 6 months. This study demonstrates that clips made of similar metals can be used piggyback in patients without ill effects provided that they are carefully handled to avoid any abrasion or misbends which could conceivably lead to corrosion.

Performance of bipolar forceps during coagulation and its dependence on the tip material: a quantitative experimental assay

2004 ◽  
Vol 100 (1) ◽  
pp. 133-138 ◽  
Author(s):  
Takeshi Mikami ◽  
Akira Takahashi ◽  
Kazuo Hashi ◽  
Shinsei Gasa ◽  
Kiyohiro Houkin
Keyword(s):  
Electron Microscopy ◽  
Stainless Steel ◽  
The Other ◽  
Content Type ◽  
Coagulation Performance ◽  
Significant Difference ◽  
Different Types ◽  
Metal Titanium ◽  
Cleaning Cycle ◽  
Fine Print

✓ The aim of this study was to measure objectively the adherence of burned tissue to bipolar forceps to evaluate the coagulation performance of forceps made of different types of metals. Coagulation performance of bipolar forceps made of gold, titanium, and stainless steel was determined by comparing the amount of protein in the adhered coagulum on the tips. The amount of adhered coagulum was significantly less on the gold-plated bipolar forceps than on those made of the other two materials. The ease with which coagulum could be removed was compared using the cleaning cycle of an ultrasonic rinsing device. This ease of removal was also significant with the gold-plated forceps. Electron microscopy observations of the surface of the forceps tips revealed a significant difference in roughness among these materials, and there were also significant differences in wetting tensions. Measuring adherence based on three different types of roughness and wetting tensions of forceps made from the same metal (titanium) also demonstrated a significant difference in the cleaning cycle. Histological examination of an artery coagulated with the gold-plated bipolar forceps showed that the structure had been completely collapsed without destruction of the layers, whereas arteries coagulated with the other materials revealed severely damaged structures. Adherence to bipolar forceps was dependent on both the material in the tips and the roughness of this material. The gold-plated bipolar forceps demonstrated the best performance.

Heifetz clip failure

1979 ◽  
Vol 50 (3) ◽  
pp. 368-373 ◽  
Author(s):  
Manuel Dujovny ◽  
Nir Kossovsky ◽  
Ram Kossowsky ◽  
Stephen Haines ◽  
Joseph C. Maroon
Keyword(s):  
Stress Corrosion ◽  
Corrosion Mechanism ◽  
Content Type ◽  
Aneurysm Clip ◽  
Metallurgical Analysis ◽  
Fine Print

✓ A metallurgical analysis of a fractured Heifetz aneurysm clip is described. The authors assign the failure to a stress-corrosion mechanism.

AMPCOLOY 83

Alloy Digest ◽  
1976 ◽  
Vol 25 (3) ◽  
Keyword(s):  
Thermal Conductivity ◽  
Corrosion Resistance ◽  
Precipitation Hardening ◽  
Base Alloy ◽  
High Strength ◽  
Heat Treating ◽  
General Corrosion ◽  
Copper Base ◽  
Resistance To Wear ◽  
Copper Base Alloy

Abstract AMPCOLOY 83 is a wrought copper-base alloy containing nominally 1.8% beryllium. It offers good formability in the unhardened condition and can be strengthened by precipitation hardening. It has a combination of high strength and hardness, good ductility, good electrical and thermal conductivity, excellent resistance to wear and fatigue, and high resistance to general corrosion. Among its many uses are components for resistance welding, bushings and shafts. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and shear strength as well as fatigue. It also includes information on corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Cu-310. Producer or source: Ampco Metal Inc..

COPPER ALLOY No. 172

Alloy Digest ◽  
1966 ◽  
Vol 15 (6) ◽  
Keyword(s):  
Thermal Conductivity ◽  
Fracture Toughness ◽  
Corrosion Resistance ◽  
Shear Strength ◽  
Copper Alloy ◽  
Precipitation Hardening ◽  
Heat Treating ◽  
General Corrosion ◽  
Endurance Strength ◽  
Resistance To Wear

Abstract Copper Alloy No. 172 is a precipitation hardening beryllium-copper alloy having high elastic and endurance strength, good electrical and thermal conductivity, excellent resistance to wear, and high resistance to general corrosion. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and shear strength as well as fracture toughness and fatigue. It also includes information on corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Cu-165. Producer or source: Copper and copper alloy mills.

ALLVAC 13-8

Alloy Digest ◽  
2002 ◽  
Vol 51 (11) ◽  
Keyword(s):  
Stainless Steel ◽  
Precipitation Hardening ◽  
Cold Working ◽  
High Strength ◽  
Heat Treating ◽  
General Corrosion ◽  
Single Treatment ◽  
Good Resistance ◽  
Temperature Performance ◽  
Very High

Abstract Allvac 13-8 has good fabricability and can be age hardened by a single treatment in the range 510-620 deg C (950-1150 deg F). Cold working prior to aging enhances the aging. This martensitic precipitation-hardening stainless steel has very good resistance to general corrosion and stress-corrosion cracking. It develops very high strength and exhibits good transverse ductility and toughness in heavy sections. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and shear strength as well as creep. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SS-866. Producer or source: Allvac Metals Company.

AL 17-7 PRECIPITATION HARDENING ALLOY

Alloy Digest ◽  
1992 ◽  
Vol 41 (5) ◽  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Precipitation Hardening ◽  
Heat Treating ◽  
Corrosion Resistant ◽  
Hardened Condition

Abstract AL 17-7 alloy, a precipitation hardening stainless steel, has moderate corrosion resistant characteristics and develops high strenth in the precipitation hardened condition. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as heat treating and joining. Filing Code: SS-528. Producer or source: Allegheny Ludlum Corporation.

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