341 results about "Inner Cannula" patented technology

A disposable tissue removal device comprises a “tube within a tube” cutting element mounted to a handpiece. The inner cannula of the cutting element defines an inner lumen and terminates in an inwardly beveled, razor-sharp cutting edge. The inner cannula is driven by both a pneumatic rotary motor and a pneumatic reciprocating motor. At the end of its stroke, the inner cannula makes contact with the cutting board to completely sever the tissue. An aspiration vacuum is applied to the inner lumen to aspirate excised tissue through the inner cannula and into a collection trap removably mounted to the handpiece. The rotary and reciprocating motors are hydraulically or pneumatically powered through a foot pedal operated pneumatically circuit. In one embodiment, the cutting element includes a cannula hub that can be connected to a fluid source, such as a valve-controlled saline bag.

A biopsy device having a cutting element is disclosed. The cutting element includes an inner cannula having a tissue receiving aperture disposed proximate a distal end thereof and an inner lumen. The inner cannula is slidably disposed within the inner lumen of an outer cannula. A vacuum chamber is disposed about at least a portion of the cutting element and is configured to create a vacuum in the cutting element during a biopsy procedure. The inner cannula is advanced distally outwardly and to cause the vacuum to be generated in the vacuum chamber. The vacuum is delivered to the cutting element whereby tissue is drawn into the tissue receiving aperture. The outer cannula is advanced distally outwardly after the inner cannula such that tissue drawn into the tissue cutting aperture is severed.

A reverse flow pump comprising two concentric passageways and an interior compartment having cut out portions in communication with a pump passageway for the directional flow of fluid relative to the pump, and a rotor positioned within the interior compartment for reversing the directional flow of fluid through a region in communication with another pump passageway. A reverse flow pump and cannula system is further provided comprising an inner cannula adjoining a pump passageway, and an outer conduit adjoining another pump passageway for the reverse flow of fluid relative to the pump. A method of transporting fluid between body cavities is also provided comprising the steps of selecting a reverse flow pump and cannula system, forming an opening in a body passageway, positioning the outer conduit through the opening, inserting the inner cannula into the outer conduit so that the distal openings of the inner cannula and the outer conduit are positioned in separated portions of the body, connecting the inlet and the outlet passageways of the pump to the proximal ends of the inner cannula and the outer conduit, and activating the pump to transport fluid between the separated portions of the body.

A biopsy device having a cutting element is disclosed. The cutting element includes an inner cannula having a tissue receiving aperture disposed proximate a distal end thereof and an inner lumen. The inner cannula is slidably disposed within the inner lumen of an outer cannula. A vacuum chamber is disposed about at least a portion of the cutting element and is configured to create a vacuum in the cutting element during a biopsy procedure. The inner cannula is advanced distally outwardly and to cause the vacuum to be generated in the vacuum chamber. The vacuum is delivered to the cutting element whereby tissue is drawn into the tissue receiving aperture. The outer cannula is advanced distally outwardly after the inner cannula such that tissue drawn into the tissue cutting aperture is severed.

A cannulation system for cardiac support uses an inner cannula disposed within an outer cannula. The outer cannula includes a fluid inlet for placement within the right atrium of a heart. The inner cannula includes a fluid inlet extending through the fluid inlet of the outer cannula and the atrial septum for placement within at least one of the left atrium and left ventricle of the heart. The cannulation system also employs a pumping assembly coupled to the inner and outer cannulas to withdraw blood from the right atrium for delivery to the pulmonary artery to provide right heart support, or to withdraw blood from at least one of the left atrium and left ventricle for delivery into the aorta to provide left heart support, or both.

A tissue removal apparatus having a cutting element mounted to a handpiece. The cutting element includes an outer cannula defining a tissue-receiving opening and an inner cannula concentrically disposed within the outer cannula. The outer cannula has a trocar tip at its distal end and a cutting board snugly disposed within the outer cannula. The inner cannula defines an inner lumen that extends the length of the inner cannula, and which provides an avenue for aspiration. The inner cannula terminates in an inwardly beveled, razor-sharp cutting edge and is driven by a single motor that causes both rotary and reciprocating movement of the inner cannula.

The present invention is a one or two-part sleeve assembly for use during minimally invasive spinal stabilization surgery. An outer sleeve is designed to slide over the coupling between a polyaxial screw and an inner sleeve so as to prevent the screw from becoming disengaged from the inner sleeve during surgery. The outer sleeve includes a lower generally cylindrical wall having a slot, and an upper extension having an outwardly protruding manipulation handle attached to it. The slot in the lower section extends the entire length of the cylindrical wall, giving it a generally “C” shaped cross section. This slot corresponds with a similar slot on the inner sleeve for receiving a stabilizing rod to be attached to the polyaxial screw during surgery. The interior diameter of the lower section is approximately the same as the outer diameter of the inner sleeve, so that the outer sleeve may slide snugly over the inner sleeve and the screw coupling. In addition, the edges of the cylindrical wall adjacent to the longitudinal slot are flattened so as to conform to the shape of the inner sleeve and the head portion of the polyaxial screw where it couples with the inner sleeve.

A pedicle screw assembly (10) that includes a cannulated pedicle screw (20) having a scalloped shank (24), a swivel top head 30 having inclined female threads (44) in a left and right arm (34, 36) to prevent splaying, a set screw (50) having mating male threads 52, a rod conforming washer (60) that is rotatably coupled to the set screw (50), the conforming washer including reduced ends to induce a coupled rod (80) to bend. A rod reduction system including an inner and an outer cannula (90, 100), the inner cannula (90) including a left and right arm (92, 94) that engage the swivel top head's (30) left and right arm (34, 36) and the outer cannula (100) dimensioned to securely slide over the inner cannula (90) to reduce the rod (80) into the swivel top head's (30) rod receiving area (38).

A disposable tissue removal device comprises a “tube within a tube” cutting element mounted to a handpiece. The inner cannula of the cuffing element defines an inner lumen and terminates in an inwardly beveled, razor-sharp cutting edge. The inner cannula is driven by both a rotary motor and a reciprocating motor. At the end of its stroke, the inner cannula makes contact with the cutting board to completely sever the tissue. An aspiration vacuum is applied to the inner lumen to aspirate excised tissue through the inner cannula and into a collection trap that is removably mounted to the handpiece. The rotary and reciprocating motors are hydraulically powered through a foot pedal operated hydraulic circuit. The entire biopsy device is configured to be disposable. In one embodiment, the cutting element includes a cannula hub that can be connected to a fluid source, such as a valve-controlled saline bag.

The preferred embodiments provide, e.g., a high quality flexible tracheostomy tube assembly including an outer tracheostomy cannula and a disposable, flexible inner cannula. In preferred embodiments, the product provides a single patient use, sterile device.

A pedicle screw assembly (10) that includes a cannulated pedicle screw (20) having a scalloped shank (24), a swivel top head 30 having inclined female threads (44) in a left and right arm (34, 36) to prevent splaying, a set screw (50) having mating male threads 52, a rod conforming washer (60) that is rotatably coupled to the set screw (50), the conforming washer including reduced ends to induce a coupled rod (80) to bend. A rod reduction system including an inner and an outer cannula (90, 100), the inner cannula (90) including a left and right arm (92, 94) that engage the swivel top head's (30) left and right arm (34, 36) and the outer cannula (100) dimensioned to securely slide over the inner cannula (90) to reduce the rod (80) into the swivel top head's (30) rod receiving area (38).

A small gauge mechanical tissue cutter / aspirator probe useful for removing the trabecular meshwork of a human eye has a generally cylindrical outer cannula, an inner cannula that reciprocates in the outer cannula, a port located near or at the distal end of the outer cannula on a side or tip of the outer cannula, and a guide with a distal surface located on the distal end of the outer cannula. A distance between the distal surface of the guide and the port is approximately equal to the distance between the back wall of Schlemm's canal and the trabecular meshwork.

Apparatus and method for dilation of tissue utilize a tissue expansion device positioned on an inner cannula with an outer overlying expansive sheath that expands upon translation of the tissue expansion device therethrough. The tissue expansion device may be an olive or wedge formed near the tip of the cannula, and the expansible sheath includes two elongated shells that are fixably attached near proximal ends, and that are resiliently connected near distal ends. Translating the tissue expansion device through the expansible sheath expands the dimension of the shells to provide even dilation of surrounding tissue. Additionally, tissue dilation is performed in one continuous motion of retracting the inner cannula through the expansible sheath or pushing the tissue expansion device through the expansible sheath. The outer expansible sheath may be removed from the inner cannula to provide a dissection instrument having minimal outer diameter. The tissue expansion device may provide two stage expansion from a minimal outer dimension in one configuration to a second larger outer dimension in response to an applied axial force to provide enhanced tissue dilation.

A composite tracheostomy tube or cannula comprising a rigid inner tube and a relatively soft outer tube. One or more ducts or chambers are formed between the outer surface of the inner tube and the inner surface of the outer tube. A sealing or mounting flange is attached to the composite tube adjacent one thereof. A balloon or inflatable cuff is attached to the outer surface of the outer tube adjacent the opposite end of the composite tube. A conduit for connection to a fluid source is provided to selectively inflate and / or deflate the inflatable cuff. An inner tube or cannula is removably inserted into the tracheostomy tube. The inner cannula includes a preferred gripping device at the proximal end thereof.

A laterally-expandable access cannula comprising:an elongated body have a distal end, a proximal end and a lumen extending between the distal end and the proximal end, the distal end of the access cannula comprising a plurality of fingers tapering inwardly as they extend distally, and the elongated body having an internal thread extending along at least a portion of the length of the lumen; andan inner sleeve disposed within the lumen of the elongated body, the inner sleeve having an external thread extending along at least a portion of its length, the external thread of the inner sleeve being in engagement with the internal thread of the elongated body, such that rotation of the inner sleeve causes the inner sleeve to move distally relative to the elongated body, whereby to cam open the plurality of fingers of the elongated body.

This invention relates to a biopsy device consisting of an inner cannula (4) and an outer hollow tube (1), a handle (7) which may be removably attached to the outer hollow tube, a locking system to secure the inner cannula and / or the attenuator in the outer hollow tube, and characterized in that the tip of the outer hollow tube is ellipse shaped and extends beyond the inner cannula, the latter ending in a blunt edge. The blunted tip of the outer hollow tube together with the sharpened ending of the inner cannula determines the cutting edge of the device. In combination the distal ends of inner cannula and outer hollow tube determine the biopsy depth size and shape of the biopsy sample in a reproducible way. In one embodiment of the present invention, the length of the inner cannula can be controlled, allowing varying the aforementioned sample parameters as desired.

The invention discloses a telescopic copper pipe component which comprises an inner pipe and an outer sleeve. The outer sleeve is sleeved on the inner pipe. A inner pipe through hole is formed in the center of the inner pipe. A plurality of linear grooves parallel with the central line of the inner tube are evenly distributed on the outer periphery of the inner pipe. Protrusions are disposed on the inner wall of the inner hole of the outer sleeve. The protrusions are disposed in the grooves. By the structure, when the outer sleeve is sleeved on the inner pipe, the protrusions can move linearly along the grooves, and the outer sleeve can move along the inner pipe. In addition, annular grooves are evenly formed in the outer periphery of the inner pipe, and the central line of each annular groove coincides with that of the inner pipe. When the protrusions enter the annular grooves, the outer sleeve can be relatively locked with the inner pipe by rotating the outer sleeve. The telescopic copper pipe is simple in structure and practical.

A retracting two-piece cannula for distracting soft tissue from bone (e.g., the articular surface of a knee) to provide a surgical workspace for osteochondral repair. After inserting an outer cannula provided with a threaded outer surface into an incision (preferably widened by one or more dilators), the outer cannula is rotated to engage the threaded outer surface with the soft tissue to be distracted. An inner cannula is then inserted into the outer cannula and advanced until it contacts the articular surface. Further relative movement between the inner and outer cannulas causes the outer cannula to be drawn away from the articular surface, thereby retracting the soft tissue and establishing the workspace. The inner and outer cannula are then locked together to maintain the workspace, and an osteochondral core may be introduced through the inner cannula.

A surgical cutting device and method for performing surgery using such is provided. The surgical device includes a handpiece or other, a stationary outer cannula connected to the base, a rotatable inner cannula connected to the base, an inner elongated shaft member connected to a distal interior surface of the lumen of the outer cannula, and a tissue cutting opening. The inner cannula includes a plurality of blades that interact with a plurality of ridges on the inner elongated shaft upon rotation of the inner cannula facilitating maceration of tissue within the lumen to prevent clogging of the device.

A surgical device is disclosed. The surgical device comprises a housing, a cutting element, a spool, a piston, and a spring. The cutting element extends from the housing at the distal end of the housing. The cutting element comprises an outer cannula and an inner cannula. The spool is engaged with the outer cannula. The piston is engaged with the inner cannula. A spring is positioned between the spool and the piston. The spool is translated distally to translate the outer cannula towards the distal end. And the piston translates the inner cannula towards the distal end to sever tissue.

A coupling for connecting a ventilator tube to a tracheotomy tube has a latching mechanism which prevents the coupling from axially displacing a tapered tubular extension of the tracheotomy tube after they have been mated in a pneumatically discrete path. For use with known adult tracheotomy tubes which have inner and outer cannulas, the latching mechanism engages the coupling with the leading end of the outer cannula collar with the inner cannula collar sandwiched therebetween. For use with known one piece children's tracheotomy tubes, the latching mechanism is a clamshell contoured to concentrically grip the tapered tubular extension of the tracheotomy tube. Interlocking the coupling and the tracheotomy tube prevents them from inadvertently axially displacing from each other. Non-axial force disengages the coupling from the tracheotomy tube so that the coupling can be axially displaced without exertion of excessive axial force on the system and the patient.

Described herein are devices and methods for positioning a wire around a target tissue. In some embodiments, a probe device includes a rigid outer cannula having a curved distal region and a flexible inner cannula slideably disposed within the rigid outer cannula, wherein the inner cannula is configured to assume a curved shape when extended distally from the outer cannula. In some embodiments, the probe device further includes a distal tip at the distal end of the inner cannula and a safety retainer cable coupled to the distal tip and secured to the probe proximally from the distal end of the safety retainer; wherein the safety retainer cable extends proximally from the distal tip and is slack. In some embodiments, the inner cannula comprises an elongate body with a longitudinally extending support member and a longitudinally extending tubular body, configured to pass a wire, disposed inside the elongate body.

A rigid extractor is revealed, a rigid device for use in percutaneous procedures to remove kidney stones directly from the kidneys. The rigid extractor uses a handle fixed to an outer rigid cannula, and an inner cannula to control an extraction device that may be removable from the inner cannula. The extractor is desirably used with a fluoroscope, in which the surgeon maneuvers the extractor with the aid of a view of the operating field provided by the fluoroscope. The surgeon then maneuvers the extractor to grasp the kidney stones and remove from the patient. The extractor may also be used with a nephroscope. The device may be used with a removable extraction device such as a basket, a grasper a pair of jaws, or a pair of scissors.

A surgical device is disclosed that comprises a cutting element, a biopsy line, a motor line, and a vacuum line. The cutting element includes an outer cannula and an inner cannula. The biopsy line is operatively connected to a control console for moving the inner cannula within the outer cannula to cut tissue cores. The motor line is operatively connected to the control console for operating the surgical device. The vacuum line is operatively connected to the inner cannula. A selectively openable tissue filter is operatively connected to the inner cannula, and is also connected to the vacuum line.

A tracheostomy tube for use with a neck plate having an aperture. The tracheostomy tube comprises an elongate outer cannula having a lumen and configured to extend through the aperture; an elongate inner cannula having a lumen and an inflatable cuff, and configured to extend through the lumen of the outer cannula such that the cuff extends beyond a distal end of the outer cannula; and an interlocking mechanism configured to releasably secure a proximal end of the inner cannula to a proximal end of the outer cannula.

The device for administering an at least two-component substance comprises a concentric lumen arrangement including (i) an inner cannula having a lumen with an inlet opening at a first end and a tip with an outlet opening at a second end opposite its first end, and (ii) an outer sheath having opposite first and second ends facing the respective first and second ends of the inner cannula, and surrounding the inner cannula along an axial length between the first and second ends of the inner cannula, wherein the outer sheath at its second end is sealingly and fixedly connected to the inner cannula and defining an outer lumen around the inner cannula, and wherein the inner cannula is provided with at least one opening for providing fluid communication between the outer lumen around the inner cannula and the lumen of the inner cannula.

A cannulation system for cardiac support uses an inner cannula disposed within an outer cannula. The outer cannula includes a fluid inlet for placement within the right atrium of a heart. The inner cannula includes a fluid inlet extending through the fluid inlet of the outer cannula and the atrial septum for placement within at least one of the left atrium and left ventricle of the heart. The cannulation system also employs a pumping assembly coupled to the inner and outer cannulas to withdraw blood from the right atrium for delivery to the pulmonary artery to provide right heart support, or to withdraw blood from at least one of the left atrium and left ventricle for delivery into the aorta to provide left heart support, or both.

A system selectively delivers either breath-synchronized, flow-targeted ventilation (BSFTV) or closed-system positive pressure ventilation (CSPPV) to augment respiration of a patient with a standard tracheal tube. A removable adaptor has a cap that can be removably attached to the proximal connector of the tracheal tube in BSFTV mode, and an inner cannula that extends within the tracheal tube to effectively divide it into two lumens. The adaptor includes a ventilator connector for removably engaging a ventilator hose to deliver air / oxygen through the adaptor and one lumen of the tracheal tube with a flow rate varying over each respiratory cycle in a predetermined waveform synchronized with the patient's respiratory cycle to augment the patient's spontaneous respiration. The adaptor also includes a port allowing the spontaneously-breathing patient to freely inhale and exhale in open exchange with the atmosphere through the other lumen.

A tissue cutting device especially suited for neurosurgical applications is disclosed and described. The device includes a handpiece and an outer cannula in which a reciprocating inner cannula is disposed. At least one position transducer for tracking a location in space of the tissue cutting device is rigidly associated with the handpiece. The position transducer is operable for sending a signal indicative of a location of a distal end of the outer cannula. The tissue cutting device may also include an angular position sensor for determining an angular position of the outer cannula relative to the position transducer.