摘要:
A method is provided for immobilizing a biomolecule coating on the surface of a medical device to obtain improved biocompatibility characteristics for contacting with tissue or body fluids such as blood. The method includes oxidizing a 2-aminoalcohol moiety of a material disposed on the surface with a periodate to form an aldehyde moiety, combining the aldehyde moiety with an amine moiety of a material to bond the aldehyde moiety to the amine moiety through an imine moiety and reacting the imine moiety with a reducing agent to form the coating immobilized on the surface by an amine linkage. Alternatively, the method includes providing on the surface a coating containing the materials having the 2-aminoalcohol moiety and the amine moiety, applying a periodate to oxidize the 2-aminoalcohol moiety to an aldehyde moiety, allowing the aldehyde moiety to react with the amine moiety through an imine moiety and reducing the imine moiety to form an amine linkage crosslinking the 2-aminoalcohol moiety to the amine moiety. The material containing the 2-aminoalcohol moiety or the amine moiety can be a biomolecule or a substrate surface of a medical device. Biomolecules such as proteins or peptides containing a 2-aminoalcohol moiety can be attached to an aminated surface or an aminated biomolecule can be attached to surface having a 2-aminoalcohol moiety.
摘要:
Articles having a graft polymer with a net ionic charge bonded to a polymeric substrate surface provide an improved method for administering a bioactive agent having a net ionic charge. The [articles are] method is especially useful [as] for thromboresistant and/or antimicrobial medical devices.
摘要:
Biocompatible heparin-like material and surfaces thereof are made by co-polymerization of acrylic acid (AA) and 2-acrylamido-2-methyl propane sulfonic acid (AMPS) and attaching the copolymer to a suitable substrate or blending the copolymer into a suitable substrate. The material produced also possesses surface slip-properties and some decreased bacterial and platelet adherence.
摘要:
A device and method for ablating tissue is disclosed comprising the steps of acquiring an anatomical image of a patient, correlating the image to the patient, guiding an ablating member within the patient while tracking the position of the ablating member in the patient, positioning the ablating member in a desired position to ablate tissue, emitting ablating energy from the ablating member to form an ablated tissue area and removing the ablating member from the patient.
摘要:
An ablation catheter including an inner tube having a length, a distal end and a longitudinal axis, a plurality of needles extending from the distal end of the inner tube and biased away from the longitudinal axis, an outer sheath slideably moveable relative to the inner tube to surround at least a portion of the length of the inner tube and its extending needles, and a radio frequency energy source electrically connected to the plurality of needles.
摘要:
Apparatus and methods for injecting biological agents into tissue. Devices are provided having elongate shafts and distal injection heads for driving needles into tissue and injecting medical agents into the tissue through the needles. A longitudinal force directed along the shaft can be translated to a needle driving force. Some devices provide controllably variable needle penetration depth. Devices include mechanical needle drivers utilizing four link pantographs, rack and pinions, and drive yokes for driving a first needle bearing body toward a second tissue contacting body. Other devices include inflatable members for driving and retracting needles. Still other devices include magnets for biasing the needles in extended and/or retracted positions. The invention includes minimally invasive methods for epicardially injecting cardiocyte precursor cells into infarct myocardial tissue.
摘要:
A tubular suction tool for accessing an anatomic surface or anatomic space and particularly the pericardium to access pericardial space and the epicardial surface of the heart to implant cardiac leads in a minimally invasive manner are disclosed. The suction tool incorporates a suction pad concave wall defining a suction cavity, a plurality of suction ports arrayed about the concave wall, and a suction lumen, to form a bleb of tissue into the suction cavity when suction is applied. The suction cavity extends along one side of the suction pad, so that the suction pad and suction cavity can be applied tangentially against a tissue site. The suction tool can incorporate light emission and video imaging of tissue adjacent the suction pad. A working lumen terminating in a working lumen port into the suction cavity enables introduction of tools, cardiac leads, and other instruments, cells, drugs or materials into or through the tissue bleb drawn into the suction cavity.
摘要:
Methods are provided for forming a coating of an immobilized biomolecule on a surface of a medical device to impart improved biocompatibility for contacting tissue and bodily fluids. A 2-aminoalcohol moiety of a biomolecule is oxidized with a periodate to an aldehyde moiety which is reacted with an amine moiety on the surface of a medical device to form an imine moiety, and the imine moiety is reduced to form an amine linkage immobilizing a coating of the biomolecule on the surface. In another method, a biomolecule coating containing an amine moiety and a 2-aminoalcohol moiety is immobilized on the surface of a medical device, the 2-aminoalcohol moiety is oxidized with a periodate to an aldehyde moiety which is reacted with the amine moiety to form an imine moiety, and the imine moiety is reduced to form a secondary amine and crosslink the coating. Each biomolecule may contain an amine moiety and a 2-aminoalcohol moiety, and the aldehyde moiety of one biomolecule resulting from periodate oxidation may react with the amine moiety of another biomolecule. In a further embodiment, a 2-aminoalcohol moiety on the surface of a medical device is oxidized with a periodate to an aldehyde moiety, and an amine moiety of a biomolecule is reacted with the aldehyde moiety to form an imine moiety which is reduced to form an amine linkage immobilizing the biomolecule on the surface.
摘要:
A method for making a medical device having at least one glycoprotein and/or glycopeptide immobilized on a substrate surface is provided. The method may include oxidizing 1,2 dihydroxy moieties with a periodate to form an aldehyde-functional material; combining the aldehyde-functional material with an amino-functional material to bond the two materials together through an imine moiety; and reacting the imine moiety with a reducing agent to form a secondary amine. Another method of the present invention may be employed to crosslink glycoproteins and/or glycopeptides immobilized on medical device surfaces. Additionally, one method of the present invention may be employed to crosslink glycoproteins and/or glycopeptides, thereby forming a crosslinked biomaterial or a crosslinked medical device coating.
摘要:
An electrosurgical instrument including an elongated shaft and a non-conductive handle. The shaft defines a proximal section, a distal section, and an internal lumen extending from the proximal section. The distal section forms an electrically conductive tip and defines at least one passage for distributing fluid. Further, the shaft is adapted to be transitionable from a straight state to a first bent state. The shaft is capable of independently maintaining the distinct shapes associated with the straight state and the first bent state. The handle is rigidly coupled to the proximal section of the shaft. With this in mind, an exterior surface of the shaft distal the handle and proximal the distal section is electrically non-conductive. In one preferred embodiment, the shaft is comprised of an elongated electrode body surrounded by an electrical insulator.