GI Endoscopy · 1 min read
Nitinol vs. Steel Hemoclips: MR Compatibility and Grip Strength
Hemostasis clips provide reliable surgical bleeding control, improving outcomes in various medical specialties through precise hemostasis.
Clinical Bottom Line
| Hemoclip Material | Radiological compatibility | Mechanical Property |
|---|---|---|
| Stainless Steel (Older Generation) | Creates massive MRI interference; frequently non-MR compatible. | Rigid but prone to "locking open" if misfired. |
| Nitinol (Shape-Memory Alloy) | MRI-Safe/Compatible. | Generates more uniform compressive force; can be re-opened and re-positioned multiple times. |
The Mechanics of Vessel Occlusion
Through-The-Scope (TTS) hemoclips are the primary mechanical line of defense against both active and delayed GI bleeding. Following a polypectomy or when facing an irrigation-resistant peptic ulcer, the endoscopist deploys these clips to physically crush the arterial wall, stopping blood flow through mechanical pressure rather than thermal charring.
The Shift to Nitinol Flexibility
In 2026, premium hemoclips (e.g., Olympus QuickClip Pro or Boston Scientific Resolution 360) universally utilize nitinol. For the endoscopist, the primary value is the ability to "re-open." Older stainless-steel clips were single-fire; once squeezed, the device was locked. Nitinol's shape-memory allows the physician to tentatively close the clip over a vessel, verify its position via fluoroscopy or visual, and if it's slightly off-center, re-open the jaws and shift the device before definitively locking it. This drastically reduces the number of "wasted" clips and ensures perfect hemostasis in the technically difficult duodenal bulb.
Clinical guidelines summarized by the Gastroscholar Research Team. Last updated: 2026. This article is intended for physicians.
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