摘要:
Systems and methods for delivering bone cement into a bone can include a handle body defining a flow path, a thermal emitter in the handle body to apply energy to bone cement passing through the flow path, a source of bone cement and an injection cannula. The cannula can be in communication with the flow path such that inserting the cannula into a bone can allow a flow of bone cement therethrough to an opening at a distal end of the cannula. Other systems and methods for delivering bone cement into a bone can include an injector body with a handle portion, and a cannula, a bone cement container, a low pressure drive mechanism configured to effect a flow of bone cement from said container to the injector body and a high pressure drive mechanism configured to effect a flow of bone cement through the injector body into the bone.
摘要:
An embodiment of the invention includes an electrosurgical jaw structure that carries cooperating PTC bodies in both series and parallel circuit components for controlled RF energy application to engaged tissue to effectively weld tissue.
摘要:
This invention relates to implantable bone fill materials, systems and methods of treating bone abnormalities such as compression fractures of vertebrae, bone necrosis, bone tumors, cysts and the like. In an exemplary embodiment, the bone abnormality is accessed and a space is created by bone removal or compaction. An exemplary implant of the invention has a substantially fluid impermeable surface portion and an interior portion including an in-situ hardenable bone cement. The method of the invention includes applying energy to the fill material to accelerate polymerization and hardening of the material for supporting the bone.
摘要:
The present invention relates in certain embodiments to systems and methods for use in osteoplasty procedures, such as vertebral compression fractures. One system for injecting a bone fill material includes a container carrying a bone fill material. An elongated introducer configured for introduction into a vertebral body is coupleable to the container to allow a flow of the bone fill material therethrough. A cooling mechanism is coupled to the container and is configured to cool the bone fill material in the container to extend the working time of the bone fill material. One method for treating a vertebra includes providing a bone fill material, cooling the bone fill material to stall the polymerization of the bone fill material, heating the bone fill material to accelerate the polymerization of the bone fill material and delivering the bone fill material into a vertebral body.
摘要:
A medical instrument coupled to first and second energy means and a computer controller for the controlled volumetric removal of thin tissue layers. The system provides a source for introducing a gas to controllably form and capture transient gas volumes in a microchannel structure at the working surface of the instrument that interfaces with a targeted tissue site. Each of the microchannel features of the working surface carries an electrode element coupled to the electrical source. The energy may be applied to the targeted site in either of two modes of operation, depending in part on voltage and repetition rate of energy delivery. In one mode of energy application, electrical potential is selected to cause an intense electrical arc across the transient ionized gas volumes to cause an energy-tissue interaction characterized by tissue vaporization. In another preferred mode of energy delivery, the system applies selected levels of energy to the targeted site by means of an energetic plasma at the instrument working surface to cause molecular volatilization of surface macromolecules thus resulting in material removal. Both modes of operation limit collateral thermal damage to tissue volumes adjacent to the targeted site. Another preferred embodiment provides and an ultrasound source or other vibrational source coupled to the working end to cause cavitation in fluid about the working end.
摘要:
An electrosurgical working end for automatic modulation of active Rf density in a targeted tissue volume. The working end of the probe of the present invention defines a tissue-engagement surface of an elastomeric material with conductive elements that extend therethrough. In one embodiment, the expansion of the elastomeric material can de-couple the conductive elements from an interior electrode based temperature to modulate current flow. In another embodiment, the elastomeric material can couple and de-couple the conductive elements from an interior electrode based engagement pressure to modulate current flow.
摘要:
A vaso-occlusive system comprising a catheter with a working end that carries a fluid media for introduction into an aneurysm. The fluid media carries a volume of microspheres, wherein each microsphere has a sacrificial shell or coating that surrounds an interior core portion of the microsphere. The core portions of the microspheres comprise either a first or second polymerizing composition, wherein interaction of such binary compositions will cause polymerization of the media into a gel or solid media that will occlude the aneurysm. An energy delivery means is provided within the catheter working end to cause removal of the sacrificial coatings of the volume of microspheres to thereby induce the polymerization process.
摘要:
An lens for correcting human vision, for example an IOL, contact lens or corneal inlay or onlay, that carries and interior phase or layer comprising a pattern of individual transparent adaptive displacement structures. In one embodiment, the displacement structures are actuated by a shape memory polymer (SMP) material or other polymer that is adjustable in shape in response to applied energy. The SMP can be designed to be selectively adjustable in volumetric dimension, modulus of elasticity and/or permeability. The adaptive optic means of the invention can be used to create highly localized surface corrections in the lens to correct higher order aberrations-which types of surfaces cannot be fabricated into and IOL and then implanted. The system of displacement structures also can provide spherical corrections in the lens.
摘要:
A surgical system for controlled application of ultrasound energy to engaged tissue volumes for creating effective biological welds or seals in tissue. The invention provides an ultrasound transmission assembly including piezoelectric elements coupled to an elongate waveguide that is reciprocatable in an interior of an introducer. The reciprocatable waveguide assembly of the invention is adapted to have multiple functionality: (i) to couple ultrasound energy to both opposing jaws to thereby deliver energy to both sides of engaged tissues to create uniform thermal weld effects; (ii) to apply very high compressive forces to captured tissues over the length of elongate jaws by engaging substantially the entire length of the jaws, and (iii) to transect the captured tissues contemporaneous with the delivery of energy to create the thermal weld. The invention further provides for use of other energy sources to deliver thermal energy to tissue, for example microwave energy, Rf energy and laser energy, either in combination with ultrasound energy or independently.
摘要:
Instruments for thermally-mediated treatment of a patient's lower esophageal sphincter (LES) to induce an injury healing response to thereby populate the extracellular compartment of walls of the LES with collagen matrices to altere the biomechanics of the LES to provide an increased intra-esophageal pressure for preventing acid reflux. A preferred embodiment is a bougie-type device for trans-esophageal introduction that carries conductive electrodes for delivering Rf energy to walls of the LES (i) to induce the injury healing response or (ii) to “model” collagenous tissues of the LES by shrinking collagen fibers therein. Typically, an Rf source is connected to at least one conductive electrode that may be operated in a mono-polar or bi-polar fashion. A sensor array of individual sensors is provided in the working end. A computer controller is provided, which together with feedback circuitry, is capable of full process monitoring and control of: (i) power delivery; (ii) parameters of a selected therapeutic cycle, (iii) mono-polar or bi-polar energy delivery, and (iv) multiplexing of current flow between various paired electrodes. The controller can determine when the treatment is completed based on time, temperature, tissue impedance or any combination thereof.