Models and methods of using same for testing medical devices
View Patent ↗Disclosed herein are synthetic anatomical models that are designed to enable simulated use testing by medical device compam'es, medical device designers, individual inventors, or any other entity interested in the performance of medical devices. These models are unique in possessing a level of complexity that allows them to be substituted for either a live animal, an animal cadaver, or a human cadaver in the testing of these devices. These models are further characterized by a similarity of geometry, individual component physical properties, and component-to-component interfacial properties with the appropriate target tissue and anatomy.
1. A method of testing a device designed for invasive transmission through a luminal structure comprising:
obtaining an artificial anatomic model configured to geometrically mimic a lumen possessing human or nonhuman animal anatomic structure, said model comprising a luminal structure having an inner luminal wall surface region comprising hydrogel, and an analog material employed by said artificial anatomic model designed to simulate at least one predetermined physical characteristic of a target tissue; wherein said artificial anatomical structure is configured to geometrically mimic vasculature, further comprising
artificial support tissue; a luminal structure supported by said artificial support tissue, and comprising a first analog material disposed along an inner luminal wall surface of said luminal structure, said first material analog having a structural integrity simulating at least one predetermined characteristic of an inner surface of said vasculature;
a liquid reservoir adapted to hold a liquid; and
a pump in fluid communication with said luminal structure, said pump causing a pulsed or continuous liquid circulation, said pump circulating said liquid from said reservoir through said luminal structure;
transmitting said device through said luminal structure such that said device bears on said region; and
evaluating how said region is affected by transmission of said device through said luminal structure.
2. The method of claim 1 , wherein said luminal structure comprises at least one layer simulating vascular tunica intima, tunica media, tunica adventitia, endothelium, internal elastic membrane, external elastic membrane, circular muscles, or adipose layer.
3. The method of claim 1 , wherein said luminal structure comprises an analog material that simulates at least one predetermined physical characteristic of an inner luminal surface of said lumen possessing human or nonhuman animal anatomical structure, said at least one predetermined physical characteristic selected from the group consisting of material strength in multi-axial tension, compression, or shear; material modulus in multi-axial tension, compression, or shear; coefficient of static or dynamic friction; elasticity; lubricity; surface energy; hydrophilicity; water content; electrical resistance; electrical conductivity; dielectric properties; light and heat absorption or adsorption; chemical absorption or adsorption; or porosity.
4. The method of claim 1 wherein said evaluating comprises determining abrasion, stress, strain, or perforation to said model by said transmission of said device through said model.
5. The method of claim 1 , wherein said determining step is achieved by visual inspection without using a light microscope, electron micrograph, or atomic force microscope.
6. The method of claim 1 , wherein said luminal structure is cooperative with artificial support tissue; and wherein said luminal structure is disassociated with said artificial support tissue prior to said evaluating step.