45 results about "Lead extraction" patented technology

An improved medical lead assembly and method of use is provided. The lead assembly includes a lead body, and a spring member positioned adjacent to the lead body. The spring member may be deployed a selectable amount to maintain the lead body in a fixed location within a patient's body. The spring member may be an expandable coil, a mesh structure that is similar to a stent, or any other similar device that may be positioned in a low-profile state during a lead implant procedure. After the lead is positioned at a target destination, the spring member may be deployed an amount that is selected based on the characteristics of the surrounding tissue, including vessel size. According to one aspect of the invention, the lead assembly may provide means for facilitating chronic lead extraction.

A lead assembly is implanted utilizing a lead introducer inserted within an opening of the lead housing. The lead introducer includes an insertion portion and a handle connected to the insertion portion. The lead assembly can be extracted with a lead extractor inserted within an opening of the lead housing. The lead extractor includes an insertion portion having an expandable element, a flexible biocompatible covering around the expandable element, and a handle connected to the insertion portion.

A catheter for debulking of an undesired deposit from an inner surface of at least one of a blood vessel wall and a stent located in a blood vessel, the catheter having a tip section comprising: circumferentially-directed laser optics; and a circular-action cutter, wherein said circumferentially-directed laser optics is configured to transmit laser radiation for modifying an area of the undesired deposit thereby preparing said area for penetration of said cutter, wherein said cutter is configured to cut through said modified area and thereby debulk at least a part of the undesired deposit. In addition, a catheter for pacemaker and ICD (Implantable Cardioverter Defibrillator) lead extraction is disclosed.

Disclosed is a comprehensive recycling method for non-ferrous metal metallurgy acidic wastewater and zinc-containing residues. The zinc-containing residues generated in the zinc smelting production process serve as an acidic wastewater neutralizer. Liquid obtained after neutralization is subjected to fluorine and chlorine removal and concentrated to meet the requirements for a zinc sulfate solution of a zinc system, and then directly enters the electrolytic zinc system. Valuable metal such as arsenic, cadmium and copper in the acidic wastewater is recycled through an impurity purification procedure of the zinc system. The zinc-containing residues are subjected to a neutralization step to be recycled and fed into a lead extraction procedure after being enriched with lead, silver and other metal. The filter residues with fluorine and chlorine removed are regenerated with a sodium hydroxide solution, the residues obtained after regeneration can be used for the fluorine and chlorine removal procedure repeatedly, and sodium fluoride, sodium chloride and sodium hydroxide in the liquid obtained after regeneration are separated and recycled through efficient evaporative crystallization. The comprehensive recycling method for non-ferrous metal metallurgy acidic wastewater and zinc-containing residues is based on an existing zinc hydrometallurgy system, the balance of original materials in the system is maintained, and an additional heavy metal impurity purification procedure is not added. The comprehensive recycling method for non-ferrous metal metallurgy acidic wastewater and zinc-containing residues is short in process, low in cost, high in valuable metal recycling rate, free of discharging of secondary waste residues and waste water and good in comprehensive economical benefit.

Snaring systems and methods involve engaging objects such as pacemaker pacing leads within a patient. Physicians can use snaring systems having loops, tags, and roller mechanisms to remove a pacing leads from a patient. For example, snaring systems can be inserted through a jugular access site, engaged with a pacemaker pacing lead, and withdrawn through the jugular access site so as to remove a portion of the pacing lead. Lead extraction techniques can be employed to further dislodge the pacing lead from the patient.

The invention relates to a process for extracting tea saponin from tea seed cakes or meal after oil frying by applying an industrial production device. The process comprises the following steps: crushing the tea seed cakes or the meal (leading the particle size to be 1-3mm), then sending into a steaming and stir-frying cauldron, drying (preventing the water content from exceeding 7%), then leading the material to enter into a material storage cylinder, using a screw conveyor to send the material into a rotocel extractor, and adding a solvent for extraction; carrying out residue-liquid separation (the meal residue can be used as a feed or a fertilizer) after double extraction, leading extraction solution to enter into a long pipe evaporator, removing part of water by double evaporation, and recycling the solvent (which can be recycled); and concentrating the extraction solution via a vacuum concentration tank, then crystallizing and drying, and obtaining a fine saponin finished product for packaging and leaving a factory. A product produced by the process contains 81.5% of active matters, and the pH value is 5.9. Compared with other methods, the process has the advantages of high product purity, light color, high production rate (14%), energy conservation, low consumption, no pollution and environmental protection, and is easy for operation and the like.

The invention provides a multi-metal comprehensive recovery process for arsenic-containing smoke dust. According to the process, leachate containing zinc and copper and leaching slag containing arsenic and lead are obtained through selective leaching, the leachate is extracted by respectively using a copper extraction agent and a zinc extraction agent, and then reverse extraction and electrodeposition are carried out so as to obtain copper and zinc; the leaching slag is leached with a mixed arsenic removing agent consisting of H2O2 and Na2S2O3 so as to obtain arsenic-containing leachate and lead-containing arsenic-removed leaching slag, the arsenic-containing leachate is concentrated and crystallized so as to obtain sodium arsenate, and the lead-containing arsenic-removed leaching slag is subjected to pyrogenic process lead extraction and electrolytic refining so as to obtain lead. According to the invention, the multi-metal comprehensive recovery process uses combined hydrometallurgy and pyrometallurgy, comprehensive recovery process and a main smelting system are effectively combined together, seamless butt joint of a part of technology and main process technology is realized, process steps are environment-friendly, metallic copper, zinc and lead are effectively recovered, and resourceful treatment of arsenic is realized.

An endovascular conduit device and method for use during cardiac lead extraction and other vascular procedures is presented. The endovascular conduit device includes an outer-sheath, a conduit member, a lumen member, and an inflation member to control the flow of fluid within the conduit member. The endovascular conduit device may be positioned intravascularly as cardiac lead extraction or other procedures are performed. If necessary, as in the case of a vascular tear, the endovascular conduit device further includes expandable members that are activated to allow blood to be forced into the channel of the conduit member. Blood may then be contained and directed safely to bypass the area of vessel injury. In doing so, a catastrophic circulatory collapse or shock is prevented.

The invention discloses a waste lead-acid battery diachylon hydrothermal reduction dual conversion method. Waste diachylon and alkali solution are firstly converted under normal pressure to remove most sulfate radicals; normal-pressure conversion liquid is fed to recover sodium sulfate; normal-pressure conversion slag and the alkali solution are pulped to feed into a reducing agent to add in a high-pressure reaction kettle for reaction under requested temperature and nitrogen partial pressure, so that residual lead sulfate in the normal-pressure conversion slag is reacted with alkali to deeply remove the sulfate radicals; meanwhile, lead dioxide is reduced as lead monoxide; after the reaction time is reached, the solid-liquid separation is performed; hydrothermal conversion liquid is returned into the normal-pressure conversion process; and lead is further extracted from the hydrothermal conversion slag. The essence of the method is to realize dual purposes of deep conversion desulfurization and reduction conversion of the waste diachylon by using a water heat and reduction combined mode; the desulfurization rate and the lead dioxide reduction rate both reach above 99.0%; and advantageous conditions are created for subsequent lead extraction from conversion slag.

The invention discloses a method for producing silica white and lead sulfide with waste with lead glass tubes as a raw material, and aims at solving the problems of complicated technology, high energy consumption and easy generation of secondary pollution in the existing lead glass tube lead-extraction technologies. According to the method, firstly waste lead glass tubes are coarsely broken and fine ground to obtain fine ground waste lead glass, and then are added with a potassium hydroxide solution to react for 60-210 minutes under 80-200 DEG C, and leaching residues and lead-silicone contained leaching solution are obtained by filtration; the lead ion concentration in the lead-silicone contained leaching solution is measured, sodium sulfide is added inside based on the mol ratio of Pb/S=1 to react for 30-120 minutes under 60-80 DEG C, and lead sulfide and filtrate are obtained by filtration; the pH value of the filtrate is adjusted to 7-9 by carbon dioxide decomposition or adding acid liquid, so that gel is obtained and then is aged for 60-180 minutes and filtered, and silica white is obtained by drying the filter cake. The method has the advantages of modest reaction conditions, simple process flow, large waste consumption and the like, and is easily suitable for large-scale industrial production.

An apparatus configured to control a lead extraction tool for assisting in removal of an implanted lead. The apparatus comprises at least one valve configured to control fluid flow to the lead extraction tool. When the at least one valve is open, the at least one valve is configured to allow fluid stored in the apparatus to flow thereby applying, when the apparatus is fluidly coupled to the lead extraction tool, fluid pressure to at least one component of the lead extraction tool. The apparatus further comprises at least one controller configured to control opening and/or closing of the at least one valve.

An electrosurgical hand piece device is configured to cut tissue with monopolar RF energy to extract a medical lead submersed in fluid. The device includes an electrode surrounded by an electrically insulating coating that can be exposed from a distal edge of the electrode when power is supplied to the device, thereby focusing the energy at the distal edge and enabling tissue to be more easily and safely cut from around the medical lead while in fluid.

Apparatus for removing a lead from a lumen of a subject including a flexible control tube shaped to define a control-tube lumen; and a flexible grasping tube shaped to define a grasping-tube lumen. The grasping tube is disposed within the control-tube lumen and includes a torque-transfer non-distal portion; and a helically-cut distal portion, that is (a) fixed at a distal end thereof to a distal end of the control tube, and (b) rotatable at least at a proximal end thereof with respect to the control tube. The helically-cut distal portion is configured to grasp the lead within the grasping-tube lumen upon the proximal end of the helically-cut distal portion being rotated with respect to the control tube.

The invention relates to a cardiac lead extraction system, comprising: a handle; an elongated body in communication with said handle; a bendable flexible portion in communication with said elongated body, said bendable flexible portion comprising a first lumen sized and shaped to fit over a cardiac lead; said bendable flexible portion being more flexible than said elongated body; an operational distal end in communication with said bendable flexible portion; where said bendable portion is configured to bend to a bending radius of less than 4 cm while keeping said first lumen open; and where said operational distal end comprises at least one lead extraction assistive tool, said operational distal end comprising a second lumen sized and shaped to fit over a cardiac lead, said second lumen being in communication with said first lumen, and said first lumen comprises an inner diameter of from about 1 mm to about 5 mm.

The invention relates to light-emitting devices, and related components, systems and methods. In one aspect, the present invention is related to light emitting diode (LED) light extraction efficiency. A non-limiting example, the application teaches a method for improving light emitting diode (LED) extraction efficiency, by providing a nano-rod light emitting diode; providing quantum wells; and reducing the size of said nano-rod LED laterally in the quantum-well plane (x and y), thereby improving LED extraction efficiency.

The invention discloses a method for recycling lead-containing waste acid. The lead-containing waste acid processed by the method is waste hydrochloric acid and includes iron ions and lead ions. The method comprises the following steps of trivalent iron reduction, lead extraction and nitric acid reverse extraction of lead. According to the method, the trivalent iron is reduced into divalent ferricchloride, then, a mixture of di phosphate and dinonylnaphthalene sulfonic acid is adopted as an extracting agent for lead extraction, nitric acid with the specific concentration is adopted as a reverse extraction agent, lead and iron are efficiently and completely separated, the content of lead ions of the recycled ferric chloride solution is lower than 8 ppm, the related standard requirement forthe ferric chloride purifying agent is met, the iron ion recycling rate is also 99% or above, the content of lead ions in the organic extracting agent obtained after reverse extraction is lower than30 ppm, the method is recyclable, the recycling cost is saved, the comprehensive recycling value of the lead-containing waste acid is increased, and the method has the excellent economy and environment-friendliness.

The invention discloses a method for extracting metal lead and coproducing a cement raw material from high-lead-content glass. The method comprises the following steps: adding high-lead-content glass into a 4-15 mol/L sodium hydroxide solution, adding an impurity remover so that the mole ratio of the Si ions in the high-lead-content glass to the metal ions in the impurity remover is 1:(0.9-3.0), and reacting at 120-300 DEG C for 5-20 hours; after the reaction is finished, filtering, and separating to obtain a solid residue and a filtrate; and by using stainless steel as the cathode and anode materials, electrolyzing at controlled voltage of 1.4-1.7V to obtain the metal lead with the purity of higher than 90% at the cathode. The method overcomes the defects of complex technique, high energy consumption and high tendency to generating secondary pollution in the existing lead extraction technique. The method has the advantages of high waste consumption, simple technical process, high lead extraction rate and the like, can coproduce the cement raw material, changes wastes into valuable substances, and can easily implement large-scale industrial application.

The invention discloses a method for rapidly recovering rhenium, copper and lead from copper smelting waste acid and a device for implementing the method. According to the method, the copper smelting waste acid is subjected to lead removing through filtering, lead residues with the lead content higher than 55% are obtained and taken as lead extraction raw materials, the lead extraction raw materials are subjected to targeted rhenium precipitation, rhenium-rich residues are obtained and are subjected to hot-pressing oxidizing leaching, a rhenium-rich leaching agent is obtained, the rhenium-rich leaching agent after evaporation and concentration is subjected to KCl rhenium precipitation and recrystallization, potassium perrhenate is prepared, and a liquid obtained after rhenium precipitation is vulcanized for copper deposition. The device comprises a rhenium and copper precipitant storage tank, a precipitation tank, a flocculating agent storage tank, a flocculation reaction tank, a reaction kettle, an evaporation-crystallization device, a centrifugal separator, a waste acid anti-gravity-osmosis filter, a rhenium-rich copper residue anti-gravity-osmosis filter, a filter press, a rhenium and copper precipitation tank steam heating system, a copper precipitation tank steam heating system and a slurry pump. The method and the device have the characteristics of low investment, rapid and short procedures, simple and efficient operation, and high recovery rate, and are clean and environment-friendly.

The invention relates to a cardiac lead extraction device, comprising: a handle; an elongated body having a first proximal end, a first distal end, and a first lumen extending from said first proximal end toward said first distal end, said lumen sized and shaped to fit over a cardiac lead; a controllable bendable flexible portion more flexible that said elongated body and having a second proximal end, a second distal end and a second lumen extending from said second proximal end toward said second distal end, said lumen sized and shaped to fit over a cardiac lead; said second proximal end interconnected to said first distal end; said second distal end interconnected to an operational distal end; wherein said operational distal end comprises at least one lead extraction assistive tool, said lead extraction helping tool is activated by a motor located at said handle or proximally to said handle.

A medical lead extraction device comprises a first shaft defining a proximal end, a distal end, and a first lumen there between sized to receive a medical lead. The first shaft includes a cutting element disposed at its distal end. The cutting element includes a sharp edge configured to mechanically cut tissue. A second shaft defining a proximal end, a distal end, and a second lumen there betweenis included. The second shaft co-axially surrounds the first shaft and is configured to slideably receive the first shaft. The second shaft includes a co-axial electrode extending from its distal endand configured to cut tissue with monopolar radiofrequency energy.