Expandable preformed structures for deployment in interior body regions
DCFirst Claim
1. A device comprisinga wall made from a flexible material resistant to abrasion by cancellous bone,the wall peripherally defining an interior space and including an expandable region preformed with a normally expanded shape outside bone, the expandable region being expandable beyond its normally expanded shape to reach an inflation volume sized and configured for compacting cancellous bone,the expandable region having proximal and distal ends,the expandable region further having a first expanded section having an interior cross-sectional area adjacent the proximal end, a second expanded section having an interior cross-sectional area adjacent the distal end, and a third section having an interior cross-sectional area located between the first and second expanded sections,when in the normally expanded shape and at the inflation volume, the interior cross-sectional area of the third section being less than the interior cross-sectional area of either the first or second expanded sections, andthe first expanded section, the second expanded section, and the third expanded section further having, respectively, a first preformed average wall thickness, a second preformed average wall thickness, and a third preformed average wall thickness, andwhen in the normally expanded shape and at the inflation volume, the third average wall thickness being greater than either the first average wall thickness or the second average wall thickness.
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Abstract
An expandable structure made from an elastomer material is preformed to a desired geometry by exposure to heat and pressure. The structure undergoes controlled expansion and further distention in cancellous bone, with controlled deformation and without stress failure.
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Citations
15 Claims
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1. A device comprising
a wall made from a flexible material resistant to abrasion by cancellous bone, the wall peripherally defining an interior space and including an expandable region preformed with a normally expanded shape outside bone, the expandable region being expandable beyond its normally expanded shape to reach an inflation volume sized and configured for compacting cancellous bone, the expandable region having proximal and distal ends, the expandable region further having a first expanded section having an interior cross-sectional area adjacent the proximal end, a second expanded section having an interior cross-sectional area adjacent the distal end, and a third section having an interior cross-sectional area located between the first and second expanded sections, when in the normally expanded shape and at the inflation volume, the interior cross-sectional area of the third section being less than the interior cross-sectional area of either the first or second expanded sections, and the first expanded section, the second expanded section, and the third expanded section further having, respectively, a first preformed average wall thickness, a second preformed average wall thickness, and a third preformed average wall thickness, and when in the normally expanded shape and at the inflation volume, the third average wall thickness being greater than either the first average wall thickness or the second average wall thickness.
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9. A device comprising
an expandable structure preformed with a normally expanded shape and being expandable beyond its normally expanded shape to a reach an inflation volume sized and configured for manipulating bone, the structure having a wall material peripherally defining an interior space, the wall material being resistant to abrasion by cancellous bone, the structure having a proximal and a distal end, the structure further having a first expandable region located near the distal end and a second expandable region located proximally of the first expandable region, the first and second expandable regions separated by a third region of the structure, the third region having a reduced cross-sectional area as compared to the cross-sectional areas of the first and second regions when the structure is in the normal expanded shape and at the inflation volume, and the first expandable region, the second expandable region, and the third expandable region further having, respectively, a first preformed average wall thickness, a second preformed average wall thickness, and a third preformed average wall thickness, and the third average wall thickness being greater than either the first average wall thickness or the second average wall thickness when the structure is in the normal expanded shape and at the inflation volume.
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13. A device comprising
a wall made from a flexible material resistant to abrasion by cancellous bone, the wall peripherally defining an interior space and including an expandable region preformed with a normally expanded shape and being expandable beyond its normally expanded shape to a reach an inflation volume sized and configured for compacting cancellous bone, the expandable region having proximal and distal ends, the expandable region further having a first expanded section adjacent the distal end, a second expanded section located proximally of the first expanded section, and a third section located between the first and second expanded sections, wherein the average outer diameter of the third section is less than the average outer diameter of either of the first or second expanded sections when the structure is in the normal expanded shape and at the inflation volume, and the first expandable section, the second expandable section, and the third expandable section further having, respectively, a first preformed average wall thickness, a second preformed average wall thickness, and a third preformed average wall thickness, and the third average wall thickness being greater than either the first average wall thickness or the second average wall thickness when the structure is in the normal expanded shape and at the inflation volume.
Specification