Patents by Inventor Jelle DIJKSTRA

Jelle DIJKSTRA 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).

  • Publication number: 20210303015
    Abstract: An electrosurgical generator with a high-voltage power supply that supplies a DC output voltage receives the DC output voltage of the high-voltage power supply and generates a high-frequency AC output voltage. When generator is operating, a control unit receives signals from an AC output voltage measuring unit and current measuring unit. The control unit limits an increase of DC output voltage of the high-voltage power supply as soon one predefined maximum value is reached or exceeded. When the generator is operating, the control unit configured to receive signals from a DC output voltage measuring unit that represent a respective current value of the DC output voltage, and to compare a respective current value of DC output voltage with a predefined minimum value for DC output voltage, and to cause the DC output voltage of the high-voltage power supply to increase as soon as it falls below the predefined minimum value.
    Type: Application
    Filed: March 29, 2021
    Publication date: September 30, 2021
    Applicant: OLYMPUS WINTER & IBE GMBH
    Inventors: Fabian JANICH, Jelle DIJKSTRA, Frank BREITSPRECHER
  • Publication number: 20210298811
    Abstract: An electrosurgical generator supplies, during operation, a high-frequency alternating current to an electrosurgical instrument for plasma cutting of body tissue. The electrosurgical generator has outputs for connecting an electrosurgical instrument to supply an electrosurgical instrument connected to the outputs with a high-frequency alternating current, and for determining the impedance of a load connected to the outputs. The electrosurgical generator features impedance and voltage measuring units as well as an output voltage control unit. The output voltage control unit is designed to control the AC output voltage depending on a maximum output voltage value that is set during operation depending on an output value of the impedance measuring unit and/or depending on an output value of the voltage measuring unit, such that the maximum output voltage value predefines a lower AC output voltage during a vaporization phase than during an ignition phase occurring subsequently to the vaporization phase.
    Type: Application
    Filed: March 29, 2021
    Publication date: September 30, 2021
    Applicant: OLYMPUS WINTER & IBE GMBH
    Inventors: Jelle DIJKSTRA, Veronika HANDRICK, Andreas KARRASCH, Frank BREITSPRECHER
  • Publication number: 20210022793
    Abstract: A testing device for an electrosurgical generator, including a first connection port and a second connection port for connecting the testing device to a patient circuit of the electrosurgical generator and including an apparatus for producing a direct voltage between the first connection port and the second connection port. The testing device is characterized in that an HF current path of the patient circuit, running from the first connection port to the second connection port, extends through the testing device and in that the apparatus for producing a direct voltage is fed by an HF current flowing through the HF current path.
    Type: Application
    Filed: February 16, 2019
    Publication date: January 28, 2021
    Applicant: OLYMPUS WINTER & IBE GMBH
    Inventor: Jelle DIJKSTRA
  • Publication number: 20210015539
    Abstract: A high-frequency generator connects an electrosurgical instrument, including an electrical output connection point for an electrosurgical instrument, a power supply, which is at least indirectly connected to the output connection point, and a power controller for controlling the electrical output power output via the output connection point. The power controller is designed to begin the output of an electrical output power when an output energy balance amount is greater than an output energy limit value and to end the output of the electrical output power when the output energy balance amount falls below a minimum value.
    Type: Application
    Filed: March 12, 2019
    Publication date: January 21, 2021
    Applicant: OLYMPUS WINTER & IBE GMBH
    Inventor: Jelle DIJKSTRA
  • Publication number: 20200347125
    Abstract: A hydrogel particle that has an average cross-sectional diameter in the range from 1 micrometer (?m) to 1000 ?m, wherein the particle includes a first polymer network with an average mesh size that allows diffusion of a molecule with an hydrodynamic radius of 1000 nanometer (nm) or less into the first polymer network and which particle includes one or more binding molecules that are immobilized by the polymer network. The hydrogel particle preferably has wherein the first polymer network has an average mesh size that prevents diffusion of a molecule with an average hydrodynamic radius of more than 1000 nm to diffuse into the first polymer network, preferably the mesh size prevents diffusion of a molecule with an average hydrodynamic radius of more than 100 nm, and preferably more than 5 nm. Methods for reducing the bioavailability of one or more soluble biological molecules in a biological system by using the described hydrogel particle.
    Type: Application
    Filed: January 18, 2019
    Publication date: November 5, 2020
    Inventors: Tom KAMPERMAN, Lisanne Paula KARBAAT, Hermanus Bernadus Johannes KARPERIN, Jeroen Christianus Hermanus LEIJTEN, Pieter Jelle DIJKSTRA, Bram ZOETEBIER
  • Patent number: 9132201
    Abstract: The invention relates to composition comprising a dextran-tyramine conjugate and a conjugate selected from the group consisting of chondroitin sulphate-tyramine, collagen-tyramine, chitosan-tyramine, chitosan-phloretic acid, gelatine-tyramine, heparan sulphate-tyramine, keratin sulphate-tyramine, hyaluronic acid-tyramine and heparin-tyramine.
    Type: Grant
    Filed: November 11, 2010
    Date of Patent: September 15, 2015
    Assignee: UNIVERSITY OF TWENTE, INSTITUTE FOR BIOMEDICAL AND TECHNICAL MEDICINE (MIRA)
    Inventors: Hermanus Bernardus Johannes Karperien, Rong Jin, Liliana Sofia Moreira Teixeira, Jan Feijen, Pieter Jelle Dijkstra
  • Publication number: 20140341874
    Abstract: The invention relates to a dextran-based tissuelette comprising platelet-rich plasma lysate (PRPL), which can be used for tissue repair. In particular, the tissuelette of the present invention can be adapted to display properties similar to natural cartilage, while having increased chondrocyte-attraction. Also, it has a tunable biostability that allows for degradation of the tissuelette material during natural tissue regeneration. In addition, the tissuelette displays full and covalent integration with the surrounding tissue when prepared directly at the site requiring tissue repair. The tissuelette of the present invention is primarily meant for use in cartilage repair, in particular cartilage repair upon degradation by osteoarthritis.
    Type: Application
    Filed: November 14, 2012
    Publication date: November 20, 2014
    Applicant: University of Twente, Institute for Biomedical Technology and Technical Medicine (MIRA)
    Inventors: Liliana Sofia Moreira Teixeira, Pieter Jelle Dijkstra, Hermanus Bernardus Johannes Karperien
  • Patent number: 8546517
    Abstract: The present invention generally relates to a poly(bisoxalamide) and a process for preparing and article comprising the poly(bisoxalamide).
    Type: Grant
    Filed: December 10, 2010
    Date of Patent: October 1, 2013
    Inventors: Rene Broos, Niels Jurrian Sijbrandi, Pieter Jelle Dijkstra, Jan Feijen
  • Patent number: 8492505
    Abstract: The present invention relates to a process for the preparation of branched biodegradable polymers comprising of the steps of: (a) preparing a macromonomer by ring-opening polymerization of at least one cyclic ester, cyclic carbonate, and/or cyclic carboxyanhydride in the presence of a branching agent and optionally a catalyst; and (b) subsequent polycondensation of the macromonomer, to a process for the preparation of a macromonomer by ring-opening polymerization of at least one cyclic ester, carbonate and/or N-carboxyanhydride in the presence of a defined branching agent and optionally a catalyst, according to step (a), and to the prepared macromonomer and branched biodegradable polymer and their uses.
    Type: Grant
    Filed: May 31, 2006
    Date of Patent: July 23, 2013
    Assignee: University of Twente
    Inventors: Jan Feijen, Zhiyuan Zhong, Pieter Jelle Dijkstra
  • Publication number: 20120276069
    Abstract: The invention relates to composition comprising a dextran-tyramine conjugate and a conjugate selected from the group consisting of chondroitin sulphate-tyramine, collagen-tyramine, chitosan-tyramine, chitosan-phloretic acid, gelatine-tyramine, heparan sulphate-tyramine, keratin sulphate-tyramine, hyaluronic acid-tyramine and heparin-tyramine.
    Type: Application
    Filed: November 11, 2010
    Publication date: November 1, 2012
    Inventors: Hermanus Bernardus Johannes Karperien, Rong Jin, Liliana Sofia Moreira Teixeira, Jan Feijen, Pieter Jelle Dijkstra
  • Patent number: 6835391
    Abstract: The invention relates to new biologically degradable aliphatic copolymers of the polyesteramide or polyesterurethane type. The invention further relates to a method for preparing the copolymers and to products which can be manufactured from the new copolymers.
    Type: Grant
    Filed: March 29, 2002
    Date of Patent: December 28, 2004
    Assignee: Chienna B.V.
    Inventors: Jeroen Mattijs Bezemer, Jan Feijen, Pieter Jelle Dijkstra
  • Publication number: 20030050422
    Abstract: The invention relates to new biologically degradable aliphatic copolymers of the polyesteramide or polyesterurethane type. The invention further relates to a method for preparing the copolymers and to products which can be manufactured from the new copolymers.
    Type: Application
    Filed: March 29, 2002
    Publication date: March 13, 2003
    Applicant: IsoTis N.V.
    Inventors: Jeroen Mattijs Bezemer, Jan Feijen, Pieter Jelle Dijkstra