Patents by Inventor David A. Drewes, Jr.
David A. Drewes, Jr. has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11534532Abstract: Disclosed herein are compositions of matter for inclusion in a medical device for visualization purposes. Such compositions may include a radiopaque metal, such as tungsten, within a functionalized hydrophobic polymer. Methods of making devices incorporating such elements are also disclosed.Type: GrantFiled: February 15, 2018Date of Patent: December 27, 2022Assignee: Cook Medical Technologies LLCInventors: David A. Drewes, Jr., Brian Tankersley
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Publication number: 20190015629Abstract: Catheters adapted for use in small body vessels are described. A catheter includes an elongate shaft having a main body that defines first and second lumens. An inner tubular member is disposed in the second lumen and is formed of a material that has a stiffness that is greater than a stiffness of the material forming the main body.Type: ApplicationFiled: September 19, 2018Publication date: January 17, 2019Inventors: Alyssa M. Bailey, Brett O. Baker, Scott E. Boatman, David A. Drewes, JR.
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Patent number: 10080865Abstract: Catheters adapted for use in small body vessels are described. A catheter includes an elongate shaft having a main body that defines first and second lumens. An inner tubular member is disposed in the second lumen and is formed of a material that has a stiffness that is greater than a stiffness of the material forming the main body and that has an elastic modulus greater than or equal to about 400 MPa.Type: GrantFiled: January 13, 2015Date of Patent: September 25, 2018Assignee: COOK MEDICAL TECHNOLOGIES LLCInventors: Alyssa M. Bailey, Brett O. Baker, Scott E. Boatman, David A. Drewes, Jr.
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Publication number: 20180236140Abstract: Disclosed herein are compositions of matter for inclusion in a medical device for visualization purposes. Such compositions may include a radiopaque metal, such as tungsten, within a functionalized hydrophobic polymer. Methods of making devices incorporating such elements are also disclosed.Type: ApplicationFiled: February 15, 2018Publication date: August 23, 2018Inventors: David A. Drewes, JR., Brian Tankersley
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Publication number: 20170189214Abstract: A sheath for deploying a medical device to a target site in the body of a patient. A tubular inner liner has a proximal portion, a distal portion, and an outer surface. An outer jacket has a proximal portion, a distal portion, and an inner surface. A reinforcing member is received within a length of the outer jacket. The outer jacket is positioned longitudinally around the inner liner and bonded to the outer surface of the liner. The reinforcing member, which may be a triaxial braid, or an encapsulated longitudinal reinforcing wire, extends along the outer jacket length and is configured for inhibiting elongation of the sheath upon deployment of the device.Type: ApplicationFiled: March 20, 2017Publication date: July 6, 2017Inventors: Brett O. Baker, Carrie L. Fercik Grant, James C. Merk, Scott E. Boatman, David A. Drewes, JR., Michael D. Deckard
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Publication number: 20170182297Abstract: A medical balloon of a balloon catheter assembly includes a balloon wall formed of at least two layers. The first layer is made of an impervious polymeric material. The second layer, which is integral with the first layer is made of a radiopaque and/or echogenic material and a polymeric material. In the preferred embodiment, there is provided 60 to 80% by weight of radiopaque material in the second layer. It has been found that these concentrations of radiopaque material provide good visibility of the balloon under ultrasonic imaging.Type: ApplicationFiled: March 14, 2017Publication date: June 29, 2017Inventors: Thomas Lysgaard, Steen Aggerholm, David A. Drewes, JR.
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Patent number: 9622892Abstract: A sheath for deploying a medical device to a target site in the body of a patient. A tubular inner liner has a proximal portion, a distal portion, and an outer surface. An outer jacket has a proximal portion, a distal portion, and an inner surface. A reinforcing member is received within a length of the outer jacket. The outer jacket is positioned longitudinally around the inner liner and bonded to the outer surface of the liner. The reinforcing member, which may be a triaxial braid, or an encapsulated longitudinal reinforcing wire, extends along the outer jacket length and is configured for inhibiting elongation of the sheath upon deployment of the device.Type: GrantFiled: March 7, 2013Date of Patent: April 18, 2017Assignee: COOK MEDICAL TECHNOLOGIES LLCInventors: Brett O. Baker, Carrie L. Fercik Grant, James C. Merk, Scott E. Boatman, David A. Drewes, Jr., Michael D. Deckard
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Publication number: 20160199623Abstract: A medical balloon for a balloon catheter is described. The balloon has at least a first layer made from a first material and a second layer made from a second material, said first and second layers being in overlying relationship with one another and being integral with one another; wherein the first layer has a softening or melting temperature which is higher than a softening or melting temperature of the second layer. A method of forming the medical balloon is also described, including locating a raw tubing in a mold; preheating and inflating the raw tubing so as to cause it to stretch; heating the raw tubing to soften or melt the second layer; setting the inflated raw tubing to form the medical balloon; and cooling the set balloon.Type: ApplicationFiled: March 22, 2016Publication date: July 14, 2016Applicant: Cook Medical Technologies LLCInventors: David A. Drewes, JR., Steen Aggerholm, Tue Thuren Bödewadt, Thomas Lysgaard
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Patent number: 9365018Abstract: A method of forming a reinforced tubular medical device in a continuous operation, and a medical device formed by the continuous method. An elongated core capable of movement about a line is provided. An elongated tubular member is formed around a moving length of the core by extruding a coating of a functionalized polymer around the moving core length, applying a reinforcing member to an outer surface of the functionalized polymer coating along the moving length, and extruding a polymeric outer jacket over the functionalized polymer and reinforcing member along the moving length, such that a bond is formed between the functionalized polymer and the polymeric outer jacket. The elongated tubular member is cut to desired length to form the tubular medical device, and the core is removed from the device.Type: GrantFiled: November 16, 2009Date of Patent: June 14, 2016Assignee: Cook Medical Technologies LLCInventors: David A. Drewes, Jr., Brett O. Baker
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Patent number: 9085097Abstract: A reinforced catheter or sheath includes an inner tube manufactured via an extrusion process from a mixture of thermoplastic and hollow glass beads. The resultant tube exhibits an inner goose bump surface that defines a central lumen. A reinforcement, such as a braid and/or coil is attached to at least a segment of the outer surface of the inner tube. A second tube of thermoplastic is extruded over at least a portion of the reinforcement. The inner goose bump surface exhibits a net low coefficient of friction comparable to that of polytetrafluoroethylene (PTFE).Type: GrantFiled: March 1, 2010Date of Patent: July 21, 2015Assignee: Cook Medical Technologies LLCInventors: David Christian Lentz, David A. Drewes, Jr.
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Publication number: 20150196731Abstract: Catheters adapted for use in small body vessels are described. A catheter includes an elongate shaft having a main body that defines first and second lumens. An inner tubular member is disposed in the second lumen and is formed of a material that has a stiffness that is greater than a stiffness of the material forming the main body and that has an elastic modulus greater than or equal to about 400 MPa.Type: ApplicationFiled: January 13, 2015Publication date: July 16, 2015Inventors: Alyssa M. Bailey, Brett O. Baker, Scott E. Boatman, David A. Drewes, JR.
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Publication number: 20130053770Abstract: A medical balloon (10) of a balloon catheter assembly (70) includes a balloon wall (22) formed of at least two layers (30, 32). The first layer (30) is made of an impervious polymeric material. The second layer (32), which is integral with the first layer (30) is made of a radiopaque and/or echogenic material and a polymeric material. In the preferred embodiment, there is provided 60 to 80% by weight of radiopaque material in the second layer (32). It has been found that these concentrations of radiopaque material provide good visibility of the balloon under ultrasonic imaging.Type: ApplicationFiled: August 24, 2012Publication date: February 28, 2013Applicant: Cook Medical Technologies LLCInventors: Steen Aggerholm, David A. Drewes, JR., Thomas Lysgaard
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Publication number: 20110282288Abstract: A method of forming a reinforced tubular medical device in a continuous operation, and a medical device formed by the continuous method. An elongated core capable of movement about a line is provided. An elongated tubular member is formed around a moving length of the core by extruding a coating of a functionalized polymer around the moving core length, applying a reinforcing member to an outer surface of the functionalized polymer coating along the moving length, and extruding a polymeric outer jacket over the functionalized polymer and reinforcing member along the moving length, such that a bond is formed between the functionalized polymer and the polymeric outer jacket. The elongated tubular member is cut to desired length to form the tubular medical device, and the core is removed from the device.Type: ApplicationFiled: November 16, 2009Publication date: November 17, 2011Applicant: Sabin CorporationInventors: David A. Drewes, JR., Brett P. Baker
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Publication number: 20110213303Abstract: A reinforced catheter or sheath includes an inner tube manufactured via an extrusion process from a mixture of thermoplastic and hollow glass beads. The resultant tube exhibits an inner goose bump surface that defines a central lumen. A reinforcement, such as a braid and/or coil is attached to at least a segment of the outer surface of the inner tube. A second tube of thermoplastic is extruded over at least a portion of the reinforcement. The inner goose bump surface exhibits a net low coefficient of friction comparable to that of polytetrafluoroethylene (PTFE).Type: ApplicationFiled: March 1, 2010Publication date: September 1, 2011Applicants: COOK INCORPORATED, SABIN CORPORATIONInventors: David Christian Lentz, David A. Drewes, JR.
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Patent number: 7968038Abstract: A large diameter, flexible, kink-resistant, delivery catheter or sheath for percutaneous delivery of a contained and implantable medical device in the vasculature of a patient. The delivery catheter or sheath includes a reinforcement such as a flat wire coil with uniform spacing between the turns, which is compression fitted about an inner, lubricous PTFE tube. The delivery catheter or sheath further includes an outer tube of a heat formable polyamide material which is heat formed and compressed through the spaces between the turns of the wire coil to mechanically connect to a roughened outer surface of the inner tube. A polymeric radiopaque marker tube may be positioned at the distal end of the coil and between the inner and outer tubes for radiographic visualization. A side port may also be positioned thereat for the infusion of contrast media.Type: GrantFiled: March 8, 2010Date of Patent: June 28, 2011Assignee: Cook Medical Technologies LLCInventors: Jay A. Dittman, David A. Drewes, Jr.
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Patent number: 7879021Abstract: A catheter having a non uniform wall thickness comprising first and second wall regions is described. The first region is thicker than the second region and at least a part of the first region comprises a material having a lower stiffness modulus than the second region. Typically, the ratio of stiffness between the first region and the second region is less than 1.25:1 and preferably approximately 1:1. The first region may comprise the same material as the second region but having a different formulation so that the stiffness modulus is altered. Alternatively, the regions may comprise different materials. The lower modulus material is coextruded into at least a part of the broadest/thicker cross sectional region(s).Type: GrantFiled: December 26, 2007Date of Patent: February 1, 2011Assignee: Sabin CorporationInventor: David A. Drewes, Jr.
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Patent number: 7857786Abstract: The present invention provides apparatus and methods for facilitating folding of a balloon before, during or after a medical procedure. In a first embodiment, the apparatus generally comprises at least one catheter shaft member, a balloon disposed on a distal region of the catheter shaft member, and at least one folding member disposed along at least a proximal region of the balloon. The folding member may comprise at least one radially-outward projecting member integrally formed with or attached to the balloon, or an internally-formed groove in the balloon, which is adapted to promote twisting of the balloon to reduce the profile of the balloon in the deflated state. Optionally, biasing members may be disposed between the folding member and an adjacent portion of the balloon to promote folding of the balloon in a clockwise or counter-clockwise direction.Type: GrantFiled: October 29, 2007Date of Patent: December 28, 2010Assignees: Cook Incorporated, Sabin CorporationInventors: David G. Burton, David A. Drewes, Jr., Eric R. Hennessy, Darin G. Schaeffer
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Patent number: 7803130Abstract: A disposable access sheath having a deflectable tip is provided. The access sheath is very flexible and allows a physician or other medical professional to provide diagnostic or therapeutic services to a remote body cavity. The access sheath has a deflectable tip that is able to bend at least 90° or 180° or more. This flexibility allows the physician or medical professional to make a very tight turn to visualize or treat the body cavity being treated. The access sheath may include a visualization system, a working channel, an irrigation channel, or other desirable features. The access sheath may include an interface at the proximal end of the working channel for insertion of an instrument for diagnosis or treatment of a human or mammalian patient.Type: GrantFiled: January 4, 2007Date of Patent: September 28, 2010Assignees: Vance Products Inc., Sabin CorporationInventors: Walter N. Ryan, Tyler J. Bunch, Bruce J. DeMars, David A. Drewes, Jr., Gregory A. Frankland
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Publication number: 20100163159Abstract: A large diameter, flexible, kink-resistant, delivery catheter or sheath for percutaneous delivery of a contained and implantable medical device in the vasculature of a patient. The delivery catheter or sheath includes a reinforcement such as a flat wire coil with uniform spacing between the turns, which is compression fitted about an inner, lubricous PTFE tube. The delivery catheter or sheath further includes an outer tube of a heat formable polyamide material which is heat formed and compressed through the spaces between the turns of the wire coil to mechanically connect to a roughened outer surface of the inner tube. A polymeric radiopaque marker tube may be positioned at the distal end of the coil and between the inner and outer tubes for radiographic visualization. A side port may also be positioned thereat for the infusion of contrast media.Type: ApplicationFiled: March 8, 2010Publication date: July 1, 2010Applicant: Cook IncorporatedInventors: Jay A. Dittman, David A. Drewes, JR.
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Patent number: 7722795Abstract: A medical device (110) including a catheter shaft (111) and a unitarily and continuously formed portion (108) having a varying durometer, and optionally including an expandable balloon (18, 118). One or both of the unitarily and continuously formed portion (108) and the balloon (18, 118) are made from an irradiation cross-linked or cross-linkable mixture of a polyamide elastomer and at least one additional cross-linking reactant. The polyamide elastomer can be a polyester amide, a polyether ester amide or a polyether amide, and is preferably a nylon block copolymer. The aromatic molecule can be 1,3,5 triethyl benzene; 1,2,4 triethyl benzene; and 1,3,5 triisopropyl benzene. The cross-linking reactant can be: (a) a difunctional material, (b) a trifunctional material, (c) a tetrafunctional material, or (d) an aromatic molecule containing at least two ring substituents, each of the ring substituents having labile hydrogens at a benzylic site therein.Type: GrantFiled: March 30, 2004Date of Patent: May 25, 2010Assignee: Cook Incorporated and Sabin CorporationInventors: Scott E. Boatman, David G. Burton, Michael C. Hoffa, Thomas A. Osborne, David A. Drewes, Jr., David R. Lessard, Maggie A. Z. Hupcey