The ultrasonic surgical instrument is being designed for use in minimally invasive However, the use of thick waveguides may not be an acceptable alternative where Robust waveguides which are not as subject to transverse vibratory motion. Motion in the waveguide may be reduced or eliminated by using thicker, more As a further alternative, longitudinal vibratory To add or subtract mass opposite or close to the asymmetric region until the center One known method of moving the center of mass is Of mass of the end effector is located along a line which extends through theĬentral axis of the waveguide. Performance may be improved by designing the end effector such that the center Where it is desirable to design end effectors which are not symmetric, Waveguide and will not induce substantial transverse motion in the waveguide. Substantially symmetric about the central axis of the transmission waveguide.Īlternatively, the surgical end effector may be small and short, in which case theĮnd effector will act like a small lumped mass at the end of the transmission Ultrasonically actuated end effectors is to design end effectors which are Therefore, one way to improve the performance of An example of such an asymmetric ultrasonic end effector is anĪsymmetric curved blade. Symmetrically about a line extending through the central axis of the transmission Not symmetrical, that is, where the mass of the end effector is not distributed The undesirable effects of vibratingĪ end effector at ultrasonic frequencies are compounded where the end effector is In the waveguide or premature stress failure. The instrument waveguide which may lead to, for example, excess heat generation Such undesirable effects may include, for example, transverse motion in Vibrating the blade at ultrasonic frequencies may have a number of undesirableĮffects. The structural stress induced in such end effectors by The nature of ultrasonic instruments, a particular ultrasonically actuated endĮffector may be designed to perform numerous functions, including, for example,Ĭutting and coagulation. Heat within adjacent tissue, facilitating both cutting and coagulation. cutting blade) of such instruments at ultrasonicįrequencies induces longitudinal vibratory movement which generates localized Ultrasonic instruments are often used in surgery to cut and coagulate tissue.Įxciting the end effector (e.g. extending parts blade double edge blade, e.g. A61B2017/320077- Working tips with special features, e.g.A61B2017/320074- Working tips with special features, e.g.A61B2017/320072- Working tips with special features, e.g.A61B17/320068- Surgical cutting instruments using mechanical vibrations, e.g.A61B17/32- Surgical cutting instruments.A61B17/00- Surgical instruments, devices or methods, e.g.A61B- DIAGNOSIS SURGERY IDENTIFICATION. ![]() A61N- ELECTROTHERAPY MAGNETOTHERAPY RADIATION THERAPY ULTRASOUND THERAPY.A61- MEDICAL OR VETERINARY SCIENCE HYGIENE.Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Application filed by Ethicon Endo Surgery Inc filed Critical Ethicon Endo Surgery Inc Publication of EP0970659A1 publication Critical patent/EP0970659A1/en Application granted granted Critical Publication of EP0970659B1 publication Critical patent/EP0970659B1/en Anticipated expiration legal-status Critical Status Expired - Lifetime legal-status Critical Current Links Original Assignee Ethicon Endo Surgery Inc Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Beaupre Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Granted Application number EP99305064A Other languages German ( de) Google Patents Curved ultrasonic blade having a trapezoidal cross sectionĭownload PDF Info Publication number EP0970659A1 EP0970659A1 EP99305064A EP99305064A EP0970659A1 EP 0970659 A1 EP0970659 A1 EP 0970659A1 EP 99305064 A EP99305064 A EP 99305064A EP 99305064 A EP99305064 A EP 99305064A EP 0970659 A1 EP0970659 A1 EP 0970659A1 Authority EP European Patent Office Prior art keywords balance blade ultrasonic surgical curved end effector Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents EP0970659A1 - Curved ultrasonic blade having a trapezoidal cross section EP0970659A1 - Curved ultrasonic blade having a trapezoidal cross section
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