Formulation for 3D printing and a 3D printed article

Patent metadata

Field	Value
Publication number	US-11845846-B2
Application number	US-201816642205-A
Country	US
Kind code	B2
Filing date	Sep 4, 2018
Priority date	Sep 4, 2017
Publication date	Dec 19, 2023
Grant date	Dec 19, 2023

Abstract

A flowable liquid formulation for 3D printing is described. The formulation comprises from 0.1 to 25 wt. % radiopaque particles, wherein at least 50% by weight of the particles have a diameter of at most 100 nm. The formulation further comprises monomeric, oligomeric and/or polymeric precursors adapted for polymerization to form a solidified article. Also described is an article (100) formed by 3D printing, the article (100) comprising a first 3D printed region (110) having a first radiopacity and a second 3D printed region (120) having a second radiopacity, wherein the first radiopacity is greater than the second radiopacity. Also described is a method of forming the article (100).

First claim

The invention claimed is:

1. A flowable liquid formulation for 3D printing a solidified article having a radiopacity of at least 200 HU up to 1200 HU, the flowable liquid formulation comprising:
from 0.1 to 25 wt. % radiopaque particles, wherein at least 50% of the particles have a diameter of at most 100 nm; and
monomeric, oligomeric and/or polymeric precursors adapted for polymerization to form the solidified article;
wherein the flowable liquid formulation comprises from 5 to 80 wt. % oligomeric precursors; and
wherein the dynamic viscosity, measured at 20° C., of the flowable liquid formulation is in a range from 100 to 1000 centipoise.

2. The flowable liquid formulation according to claim 1 comprising from 5 to 10 wt. % radiopaque particle.

3. The flowable liquid formulation according to claim 1 wherein the radiopaque particles comprise ZrO 2 particles, Nb 2 O 5 particles, Ta 2 O 5 particles and/or silver acetate (CH 3 CO 2 Ag) particles.

4. The flowable liquid formulation according to claim 1 comprising from 40 to 80 wt. % monomeric, oligomeric and/or polymeric precursors.

5. The flowable liquid formulation according to claim 1 comprising from 20 to 60 wt. % monomeric precursors.

6. The flowable liquid formulation according to claim 1 comprising at least one of a photoinitiator, a retarder solvent, a filler and a colouring agent.

7. An article formed by 3D printing, the article having a radiopacity of at least 200 HU up to 1200 HU, the article comprising a first 3D printed region having a first radiopacity and a second 3D printed region having a second radiopacity, wherein the first radiopacity is greater than the second radiopacity, wherein the first 3D printed region is obtained by polymerisation of the formulation according to claim 1 .

8. The article according to claim 7 , wherein the artic a calibration standard for a medical radiography apparatus.

9. The article according to claim 7 , wherein the article is a medical device.

Assignees

• Univ Limerick

Inventors

• O'Sullivan Kevin Jeremiah
• O'Sullivan Leonard William
• Clifford Seamus
• Shannon Alice

Classifications

• C08K3/22 Primary

  of metals · CPC title

• A61B6/583

  using calibration phantoms · CPC title

• A61L31/028

  Other inorganic materials not covered by A61L31/022 - A61L31/026 · CPC title

• A61L31/18

  Materials at least partially X-ray or laser opaque · CPC title

• B29C64/106

  using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material · CPC title