US2017042711A1PendingUtilityA1
Polymeric stent and laser system for manufacturing the same
Est. expiryFeb 26, 2034(~7.6 yrs left)· nominal 20-yr term from priority
B23K 2103/42B23K 2101/02A61F 2240/001B23K 26/0676A61F 2002/91533B29K 2067/046A61F 2/82B23K 26/0624B29C 2035/0838B29K 2995/006B23K 26/402A61F 2210/0004A61F 2002/91575A61F 2002/91583A61F 2002/91541B29C 35/0805B23K 26/38B23K 2103/50B29C 59/165A61F 2/915B29C 35/08B29L 2031/7532B23K 2203/42
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Claims
Abstract
Methods of manufacturing polymeric stents by forming a pattern on a polylactic acid tube using a second harmonic generator laser and polylactic acid polymeric stents having a pattern formed using a second harmonic generator laser.
Claims
exact text as granted — not AI-modified1 - 13 . (canceled)
14 . A polylactic acid polymeric stent, wherein the polylactic acid polymeric stent has a pattern that is cut using a second harmonic generator laser in which a wavelength of 940 nm to 1,552 nm is converted,
wherein the second harmonic generator laser has a pulse width of 1 fs to 900 fs and a repetition rate of 2 kHz to 200 kHz, and wherein the polylactic acid polymeric stent has a variation in polydispersity index (PDI) of 20% or less, as represented by the following Equation 1:
Variation
in
Polydispersity
Index
(
%
)
=
B
-
A
A
×
100
,
Equation
1
in Equation 1,
A is a polydispersity index of a polylactic acid polymeric stent before a pattern is cut, and
B is a polydispersity index of the polylactic acid polymeric stent after the pattern is cut.
15 . The polylactic acid polymeric stent of claim 14 , wherein the polylactic acid polymeric stent has a polydisperity index of 1 to 2.
16 . The polylactic acid polymeric stent of claim 14 , wherein a variation in average molecular weight of the polylactic acid polymeric stent represented by the following Equation 2 is 20% or less:
Variation
in
Average
Molecular
Weight
(
%
)
=
C
-
D
C
×
100
,
Equation
2
in Equation 2,
C is an average molecular weight of a polylactic acid polymeric stent before a pattern is cut, and
D is an average molecular weight of the polylactic acid polymeric stent after the pattern is cut.
17 . A polylactic acid polymeric stent, wherein the polylactic acid polymeric stent has a pattern that is cut using a second harmonic generator laser in which a wavelength of 940 nm to 1,552 nm is converted,
wherein the second harmonic generator laser has a pulse width of 1 fs to 900 fs and a repetition rate of 2 kHz to 200 kHz, and wherein the polylactic acid polymeric stent has a variation in average molecular weight of 20% or less, as represented by the following Equation 2:
Variation
in
Average
Molecular
Weight
(
%
)
=
C
-
D
C
×
100
,
Equation
2
in Equation 2,
C is an average molecular weight of a polylactic acid polymeric stent before a pattern is cut, and
D is an average molecular weight of the polylactic acid polymeric stent after the pattern is cut.
18 . A laser system for cutting a pattern on a polylactic acid tube, comprising:
a laser that generates a first laser beam having a first wavelength between 940 nm to 1,552 nm; a second harmonic generator through which the first laser beam passes to create a second laser beam with a second wavelength between 470 nm to 776 nm, wherein the second laser beam is adapted to cut the pattern on the polylactic acid tube; and wherein the second harmonic generator laser has a pulse width of 1 fs to 900 fs and a repetition rate of 2 kHz to 200 kHz.
19 . The laser system of claim 18 , wherein the first wavelength is between 1,000 nm to 1,100 nm.
20 . The laser system of claim 18 , wherein the second wavelength is 500 nm to 550 nm.
21 . The laser system of claim 18 , wherein the second harmonic generator laser is a neodymium-doped laser, a ytterbium-doped laser, an erbium-doped laser, or a hybrid fiber laser.
22 . The laser system of claim 18 , wherein the power of the laser is between 0.1 W to 10 W before or after being converted into the second harmonic generator laser.
23 . The laser system of claim 18 , wherein the spot size generated by the second harmonic generator laser is between about 1 μm to 50 μm.
24 . The laser system of claim 18 , wherein the second harmonic generator laser has a pulse width of 1 fs to 10 fs.
25 . The laser system of claim 18 , wherein the diameter of the polylactic acid tube is about 0.3× to about 1× of the inner diameter of a human blood vessel.
26 . The laser system of claim 18 , wherein the diameter of the polylactic acid tube is about 2.5 mm to about 4.0 mm in diameter.Cited by (0)
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