Temperature controlled crimping

• US 8,052,912 B2
• Filed: 10/01/2004
• Issued: 11/08/2011
• Est. Priority Date: 12/01/2003
• Status: Expired

• Current Assignee: Advanced Cardiovascular Systems Incorporated
• Original Assignee: Advanced Cardiovascular Systems Incorporated
• Inventors: Abbate, Anthony, Gale, David C., Huang, Bin, Pacetti, Stephen D.
• Primary Examiner(s): Crispino; Richard
• Assistant Examiner(s): NGUYEN, PHU HOANG
• Application Number:
  US10/957,022
• Publication Number:
  US 20050119720A1
• Time in Patent Office: 2,594 Days
• Field of Search: None
• US Class Current: 264/320
• CPC Class Codes: A61F 2/9522 Means for mounting a stent or stent-graft onto or into a placement instrument
• CPC Class Codes: A61F 2/9524 Iris-type crimpers
• CPC Class Codes: A61F 2/9526 using a mandrel
• CPC Class Codes: A61F 2/958 Inflatable balloons for placing stents or stent-grafts
• CPC Class Codes: A61L 31/06 obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds A61L31/041 takes precedence
• CPC Class Codes: A61L 31/10 Macromolecular materials
• CPC Class Codes: A61L 31/14 Materials characterised by their function or physical properties , e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials
• CPC Class Codes: B29B 13/024 Hollow bodies, e.g. tubes or profiles
• CPC Class Codes: B29C 2035/0822 using IR radiation
• CPC Class Codes: B29C 2071/022 Annealing
• CPC Class Codes: B29C 65/56 using mechanical means or mechanical connections, e.g. form-fits
• CPC Class Codes: B29C 65/76 Making non-permanent or releasable joints
• CPC Class Codes: B29C 66/71 characterised by the composition of the plastics material of the parts to be joined welding bar compositions B29C65/125
• CPC Class Codes: B29C 66/73117 Tg, i.e. glass transition temperature
• CPC Class Codes: B29C 66/9121 by measuring the temperature
• CPC Class Codes: B29C 66/91431 the temperature being kept constant over time
• CPC Class Codes: B29C 66/91641 the heat or the thermal flux being non-constant over time
• CPC Class Codes: B29C 66/919 characterised by specific temperature, heat or thermal flux values or ranges specific electrical resistance values B29C66/81262
• CPC Class Codes: B29C 66/91921 in explicit relation to another temperature, e.g. to the softening temperature or softening point, to the thermal degradation temperature or to the ambient temperature
• CPC Class Codes: B29C 66/91941 in explicit relation to Tg, i.e. the glass transition temperature, of the material of one of the parts to be joined
• CPC Class Codes: B29C 66/91945 : lower than said glass transition temperature
• CPC Class Codes: B29K 2001/00 : Use of cellulose, modified cellulose or cellulose derivatives, e.g. viscose, as moulding material
• CPC Class Codes: B29K 2001/12 : Cellulose acetate
• CPC Class Codes: B29K 2023/00 : Use of polyalkenes or derivatives thereof as moulding material
• CPC Class Codes: B29K 2023/08 : Copolymers of ethylene B29K2023/16 takes precedence
• CPC Class Codes: B29K 2023/083 : EVA, i.e. ethylene vinyl acetate copolymer
• CPC Class Codes: B29K 2023/086 : EVOH, i.e. ethylene vinyl alcohol copolymer
• CPC Class Codes: B29K 2023/18 : Polymers of hydrocarbons having four or more carbon atoms, e.g. polymers of butylene, e.g. PB, i.e. polybutylene
• CPC Class Codes: B29K 2025/08 : Copolymers of styrene, e.g. AS or SAN, i.e. acrylonitrile styrene B29K2055/02 takes precedence
• CPC Class Codes: B29K 2027/06 : PVC, i.e. polyvinylchloride
• CPC Class Codes: B29K 2027/08 : PVDC, i.e. polyvinylidene chloride
• CPC Class Codes: B29K 2027/16 : PVDF, i.e. polyvinylidene fluoride
• CPC Class Codes: B29K 2029/00 : Use of polyvinylalcohols, polyvinylethers, polyvinylaldehydes, polyvinylketones or polyvinylketals or derivatives thereof as moulding material
• CPC Class Codes: B29K 2031/00 : Use of polyvinylesters or derivatives thereof as moulding material
• CPC Class Codes: B29K 2033/08 : Polymers of acrylic acid esters, e.g. PMA, i.e. polymethylacrylate
• CPC Class Codes: B29K 2033/12 : Polymers of methacrylic acid esters, e.g. PMMA, i.e. polymethylmethacrylate
• CPC Class Codes: B29K 2033/20 : PAN, i.e. polyacrylonitrile
• CPC Class Codes: B29K 2055/02 : ABS polymers, i.e. acrylonitrile-butadiene-styrene polymers
• CPC Class Codes: B29K 2059/00 : Use of polyacetals , e.g. POM, i.e. polyoxymethylene or derivatives thereof, as moulding material
• CPC Class Codes: B29K 2063/00 : Use of EP, i.e. epoxy resins or derivatives thereof, as moulding material
• CPC Class Codes: B29K 2067/00 : Use of polyesters or derivatives thereof, as moulding material
• CPC Class Codes: B29K 2067/04 : Polyesters derived from hydroxycarboxylic acids
• CPC Class Codes: B29K 2069/00 : Use of PC, i.e. polycarbonates or derivatives thereof, as moulding material
• CPC Class Codes: B29K 2071/00 : Use of polyethers , e.g. PEEK, i.e. polyether-etherketone or PEK, i.e. polyetherketone or derivatives thereof, as moulding material
• CPC Class Codes: B29K 2075/00 : Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as moulding material
• CPC Class Codes: B29K 2077/00 : Use of PA, i.e. polyamides, e.g. polyesteramides or derivatives thereof, as moulding material
• CPC Class Codes: B29K 2079/08 : PI, i.e. polyimides or derivatives thereof
• CPC Class Codes: B29K 2083/00 : Use of polymers having silicon, with or without sulfur, nitrogen, oxygen, or carbon only, in the main chain, as moulding material
• CPC Class Codes: B29L 2031/7542 : Catheters
• CPC Class Codes: C08L 67/04 : Polyesters derived from hydroxycarboxylic acids, e.g. lactones C08L67/06 takes precedence
• CPC Class Codes: Y10T 29/49865 : by temperature differential [e.g., shrink fit]
• CPC Class Codes: Y10T 428/24942 : including components having same physical characteristic in differing degree
• CPC Class Codes: Y10T 428/3154 : Of fluorinated addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31544 : Addition polymer is perhalogenated
• CPC Class Codes: Y10T 428/31855 : Of addition polymer from unsaturated monomers

Abstract

This disclosure describes a method for crimping a polymeric stent onto a catheter for percutaneous transluminal coronary angioplasty or other intraluminal interventions. The method comprises crimping the stent onto a catheter when the polymer is at a target temperature other than ambient temperature. The polymer can optionally comprise drug(s).

Claims

1. A method of making a medical device comprising:

providing a stent cut from a tubing made of a polymer combination comprising poly(L-lactide);

positioning the stent loosely over a catheter;

crimping the positioned stent to secure the stent to a catheter, wherein the crimping reduces the diameter of the stent,

wherein the temperature of the stent substrate during the crimping is at a temperature between 10°

C. below the conventionally measured glass transition temperature for poly(L-lactide) (Tg) and below Tg.

2. The method of claim 1, wherein the method further comprises annealing the stent at a second temperature after securing the stent to the catheter.

3. The method of claim 1, wherein the temperature is between 5°

C. below Tg and below Tg.

4. The method of claim 1, wherein the temperature of the stent during crimping is adjusted by thermal contact with a heat source.

5. The method of claim 1, wherein the crimping comprises applying radial compression pressure to the stent to reduce the diameter.

6. The method of claim 1, wherein the temperature is between 2°

C. below Tg and below Tg.