Simulated tissue products and methods

Patent metadata

Field	Value
Publication number	US-10559227-B2
Application number	US-201615576778-A
Country	US
Kind code	B2
Filing date	Jun 2, 2016
Priority date	Apr 5, 2016
Publication date	Feb 11, 2020
Grant date	Feb 11, 2020

Abstract

Simulated tissue products and methods involving an enhanced simulated tissue product, the enhanced simulated tissue product formed from a polyvinyl alcohol material having a molecular chain length in a range of at least approximately 7000 vinyl alcohol repeat units; and water, wherein the polyvinyl alcohol material has a preferred molecular chain length in a range of at least approximately 7150 vinyl alcohol repeat units; wherein the aqueous polyvinyl alcohol solution involves an additive, and, wherein the additive involves a plurality of nanoparticles. The simulated tissue products and methods are further useful with multi-metric surgery simulator devices, systems, and methods, such as those for training surgical tasks.

First claim

What is claimed:

1. A method of fabricating an enhanced simulated tissue product, comprising:
providing an aqueous polyvinyl alcohol solution, providing the aqueous polyvinyl alcohol solution comprising providing a polyvinyl alcohol material having a molecular chain length in a range of at least approximately 7000 vinyl alcohol repeat units, providing water, and dissolving the polyvinyl alcohol material in the water,
wherein providing the aqueous polyvinyl alcohol solution comprises providing polyvinyl alcohol in a preferred concentration of approximately 10 weight % in water,
wherein providing the aqueous polyvinyl alcohol solution further comprises providing an additive,
wherein providing the additive comprises providing a plurality of nanoparticles, and
wherein providing the plurality of nanoparticles comprises providing at least one portion thereof with at least one optically diffusive property for enhancing imaging and a surfaced-enhanced Raman scattering property;
forming at least one simulated anatomical feature by 3D printing;
molding the aqueous polyvinyl alcohol solution over the at least one simulated anatomical feature, thereby encapsulating the at least one simulated anatomical feature; and
iteratively temperature-cycling the aqueous polyvinyl alcohol solution,
thereby providing the enhanced simulated tissue product.

2. The method of claim 1 , wherein providing the aqueous polyvinyl alcohol solution comprises providing the polyvinyl alcohol material having a molecular chain length in a range of at least approximately 7150 vinyl alcohol repeat units.

3. The method of claim 1 , wherein molding comprises at least one technique of casting, injection molding, vacuum molding, compression molding, extrusion molding, matrix molding, rotational molding, and thermoforming.

4. The method of claim 1 , wherein molding comprises providing a plurality of mold portions.

5. The method of claim 4 , wherein providing the plurality of mold portions comprises:
providing an outer mold portion; and
providing at least one inner mold portion.

6. The method of claim 5 ,
wherein providing the outer mold portion comprises configuring the outer mold portion to accommodate the at least one inner mold portion,
wherein providing the outer mold portion comprises configuring the outer mold portion to complementarily simulate an outer surface of natural tissue,
wherein providing the at least one inner mold portion comprises configuring each at least one inner mold portion to complementarily simulate an inner surface of the natural tissue, and
whereby the enhanced simulated tissue product comprises physical properties that approximate the natural tissue.

7. The method of claim 5 , wherein at least one of:
providing the outer mold portion comprises configuring the outer mold portion with a generally circular cross-section; and
providing the at least one inner mold portion comprises configuring each at least one inner mold with a generally circular cross-section,
whereby the enhanced simulated tissue product comprises at least one configuration approximating a natural blood vessel, a branch of natural blood vessels, a natural nerve bundle, and a branch of nerve bundles,
whereby the enhanced simulated tissue product is resistant to collapse, and
whereby the product is consumable.

8. The method of claim 1 , wherein iteratively temperature-cycling comprises:
cooling the aqueous polyvinyl alcohol solution to a temperature in a range of at least less than approximately freezing;
holding freezing the aqueous polyvinyl alcohol solution at a temperature in the range of at least less than approximately freezing;
thawing the aqueous polyvinyl alcohol solution to a temperature in a range of at least greater than ambient; and
holding thawing the aqueous polyvinyl alcohol solution at a temperature range of at least greater than ambient.

9. The method of claim 8 ,
wherein cooling comprises freezing the aqueous polyvinyl alcohol solution to a temperature in a range of approximately −11° C. and less,
wherein holding freezing comprises subjecting the aqueous polyvinyl alcohol solution to a temperature in a range of approximately −11° C. and less for a duration of approximately 14 hours,
wherein thawing comprises subjecting the aqueous polyvinyl alcohol solution to a temperature in a range of approximately +10° C. and more for a duration of approximately 3 hours, and
wherein holding thawing comprises subjecting the aqueous polyvinyl alcohol solution to 10 a temperature in a range of approximately +10° C. and more for a duration of approximately 6 hours.

10. The method of claim 8 , wherein thawing comprises slowly thawing the aqueous polyvinyl alcohol solution by way of refrigeration from a temperature in a range of approximately −11° C. to approximately +10° C. in a duration range of approximately 3 hours to approximately 12 hours.

11. An enhanced simulated tissue product fabricated by the method of claim 1 .

12. The method of claim 1 ,
wherein providing the at least one simulated anatomical feature comprises providing at least one of: a negative space, a simulated brain ventricle, a simulated vascular structure, and a simulated cerebral spinal fluid,
wherein providing the simulated cerebral spinal fluid is formed by at least partially dissolving a printed 3D volume, thereby forming a fluid-filled void,
wherein 3D printing comprises using at least one of a salt, a sugar, a corn starch, a sand, a silicone, and a combination of a polystyrene as a solute and a limonene as dissolution agent, and
wherein providing the simulated vascular structure comprises 3D printing a polyvinyl alcohol filament having a wall thicknesses.

13. A method of using an enhanced simulated tissue product operable with a multi-metric surgical simulator system, the method comprising:
providing the enhanced simulated tissue product operable with the multi-metric surgical simulator system, providing the enhanced simulated tissue product comprising providing an aqueous polyvinyl alcohol solution, providing the aqueous polyvinyl alcohol solution comprising providing a polyvinyl alcohol material having a molecular chain length in a range of at least approximately 7000 vinyl alcohol repeat units, providing water, and dissolving the polyvinyl alcohol material in the water,
wherein providing the aqueous polyvinyl alcohol solution comprises providing polyvinyl alcohol in a preferred concentration of approximately 10 weight % in water,
wherein providing the aqueous polyvinyl alcohol solution further comprises providing an additive,
wherein providing the additive comprises providing a plurality of nanoparticles, and
wherein providing the plurality of nanoparticles comprises providing at least one portion thereof with at least one optically diffusive property for enhancing imaging and a surfaced-enhanced Raman scattering property;
forming at least one simulated anatomical feature by 3D printing;
molding the aqueous polyvinyl alcohol solution over the at least one simulated anatomical feature, thereby encapsulating the at least one simulated anatomical feature;
iteratively temperature-cycling the aqueous polyvinyl alcohol solution,
thereby providing the enhanced simulated tissue product; and
commencing surgical training by way of the enhanced simulated tissue product.

14. The method of claim 13 , wherein providing the aqueous polyvinyl alcohol solution comprises providing the polyvinyl alcohol material having a molecular chain length in a range of at least approximately 7150 vinyl alcohol repeat units.

15. The method of claim 13 ,
wherein it

Assignees

• Synaptive Medical Barbados Inc
• Gmeiner Timotheus Anton
• Kerins Fergal
• Whitton Gregory Allan
• Hoang Kimberly Bojanowski

Inventors

• Gmeiner Timotheus Anton
• Kerins Fergal
• Whitton Gregory Allan
• Hoang Kimberly Bojanowski

Classifications

• A61B2034/105

  Modelling of the patient, e.g. for ligaments or bones · CPC title

• B29L2031/753

  Medical equipment; Accessories therefor (bloodbags, medical bags B29L2031/7148; artificial eyes B29L2011/0008) · CPC title

• B29C35/02

  Heating or curing, e.g. crosslinking or vulcanizing {during moulding, e.g. in a mould}(cold vulcanisation B29C35/18 {; vulcanising tyres, presses therefor B29D30/0601}) · CPC title

• G09B23/30 Primary

  Anatomical models {(G09B23/281 - G09B23/288 take precedence)} · CPC title

• A61B34/10

  Computer-aided planning, simulation or modelling of surgical operations · CPC title