Methods and apparatuses for forming fibrous tubes
View Patent ↗Embodiments of the present disclosure are directed to apparatuses and methods for fabricating tubular structures from a combination of fibrous materials for use in, for example, tissue engineering scaffold applications. These materials may also be useful in other biological or non-biological applications in which such tubular fibrous structures may be applicable, examples including conventional medical devices, filters, fiber optics, cable wraps, geotextiles, batteries, fuel cells, armor, and other diverse applications.
1. A system for forming tubular scaffolds for tissue engineering, comprising:
a mandrel with an outer circumference configured to receive a strip of scaffolding material wound there around;
at least one first structure configured with at least one first recess configured to receive at least a first portion of the circumference of the mandrel with the wound scaffolding material;
at least one second structure configured with at least one second recess configured to receive at least a second portion of the circumference of the mandrel with the wound scaffolding material;
at least one channel provided along a length of the second structure and arranged between the internal surface of the second recess and an external surface of the second structure,
wherein
the at least one first structure and the at least one second structure are configured for mated arrangement such that upon mating the circumference of the mandrel having the strip of scaffolding material wound there around is substantially encompassed by the first and second recesses,
the strip of scaffolding material wound around the circumference of the mandrel such that a first lengthwise edge of the strip is aligned immediately adjacent to a second lengthwise edge of the strip to form a tubular structure,
the two adjacently positioned lengthwise edges forming a lengthwise boundary, the lengthwise boundary being arranged adjacent the channel;
and
at least one needle arranged adjacent the channel and configured for insertion through the channel to tangentially puncture the tubular structure proximate to and along the lengthwise boundary from at least one side of the lengthwise boundary such that a portion of one or more fibers from the strip near at least one of the lengthwise edges traverses the lengthwise boundary and intertwines with one or more fibers from the strip near the other lengthwise edge thereby forming a seam.
2. The system of claim 1 , further comprising:
an electromechanical linear actuator configured to at least one of:
insert and retract the at least one needle through the channel repeatedly; and move the at least one needle longitudinally along the channel.
3. The system of claim 2 , wherein the electromechanical linear actuator is further configured to position the at least one needle at a determined distance from the tubular structure prior to tangentially puncturing the tubular structure.
4. The system of claim 1 , wherein the at least one needle comprises a plurality of needles.
5. The system of claim 4 , wherein:
the plurality of needles comprises needles with barbed triangular blades arranged in a linear array; and
a face of each of the barbed triangular blades of the plurality of needles are oriented substantially identically.
6. The system of claim 1 , further comprising:
a quarter-cylindrical third structure with a diameter corresponding to an outer diameter of the mandrel with the strip of scaffolding material wound thereon, the third structure configured to comb over one of the first lengthwise edge of the strip and the second lengthwise edge of the strip so as to align the first lengthwise edge of the strip and the second lengthwise edge of the strip immediately adjacent to each other to form the tubular structure.
7. The system of claim 4 , wherein the plurality of needles are arranged in a predetermined pattern.
8. The system of claim 1 , wherein the at least one needle is configured for advancing and retracting a plurality of times.
9. The system of claim 1 , further comprising means configured for repetitive advancement and retraction of at least the tip of the at least one or more needles.