105 results about "Hemostasis valve" patented technology

A hemostasis cannula unit including a valve housing, a cap, and a hemostasis valve, wherein the hemostasis valve includes a proximal valve gasket and a distal valve gasket compressed against the valve gasket by the valve housing, wherein the proximal valve gasket is the same shape as the distal valve gasket.

A hemostasis cannula unit including a valve housing, a cap, and a hemostasis valve, wherein the hemostasis valve includes a valve gasket and a valve membrane compressed against the valve gasket by the valve housing, wherein the valve gasket is thicker than the valve membrane.

A system for connecting a hemostasis valve to a splittable sheath includes an interface formed between a ledge on the proximal end of a cannula portion of the hemostasis valve and an engagement structure aligned with the handles of the splittable sheath. Pulling the handles to split the sheath likewise disengages the ledge from the engagement structure. A snap ring on the cannula portion engages a snap ring in the lumen of a sheath hub formed on the proximal end of the splittable sheath. An O-ring between the cannula portion and the sheath hub provides a fluid-tight seal.

A one-piece hemostasis valve located within a longitudinally extended housing, with the valve comprising an extended sealing neck having a passageway therethrough, communicating with a sealing chamber having opposing sealing exit lips and preferably support shoulders on the outside of the valve adjacent to the sealing neck to provide support for the valve. The passageway of the extended sealing neck contains narrowed and broadened portions to prevent blood loss when receiving a guidewire and catheter inserted through the passageway of the sealing neck.

An indwelling catheter comprises a tube, a female connector and an elastically deformable hemostasis valve which can be pressed by a male connector. An opening taper portion tapered forwardly is formed in a longitudinal intermediate portion of an inner circumferential surface of the female connector. The elastically deformable hemostasis valve is provided longitudinally slidably in the opening taper portion of the female connector and an inside portion extending rearwardly from the opening taper portion. The hemostasis valve includes; a body having a hollow form opened at its front and rear ends or a tubular portion fitted over the connecting portion from a rearward direction; and an openable / closable portion being opened by elastic deformation of the body or the tubular portion.

A system is disclosed for preventing air from entering a first catheter or cannula of a multi-catheter system. Air is prevented from entering the proximal end of the first catheter by an axially elongate chamber having an impeller, the chamber being affixed to the proximal end of the first catheter. The first catheter is affixed at an offset location, near the periphery of the chamber. The impeller is driven by a motor drive and imparts rotational energy to the fluid within the chamber forcing any air within the chamber to migrate to the center of the chamber by buoyancy effects. The air is removed through a port near the centerline of the chamber. Liquid removed with the air is returned to the chamber to minimize liquid loss during the procedure. Hemostasis valves or seals can be provided at the entrance and the exit of the chamber. A second catheter inserted through the chamber and into the first catheter is unable to entrain gas into the first catheter because any gas that enters the chamber is routed to the centerline of the chamber where it is removed. The first catheter can be a cannula or an introduction sheath, devices suited for endovascular access into the mammalian cardiovascular system where pressures may fall below ambient room pressure, a condition, which could encourage the possibility of air embolism to a patient. Inflow of fluid from an external pump scrubs the second catheter shaft of air bubbles attached by surface tension.

A hemostasis valve to maintain hemostasis during the insertion, removal or reposition of a medical instrument in the vascular system of a patient. The hemostasis valve includes a valve body having lumen extending therethrough, a first valve positioned across the lumen, and having a passage with a diameter that is continuously variable, a second valve positioned across the lumen, and having a passage with a diameter that is continuously variable. The first and second valves being spaced apart longitudinally along the lumen. A connector rotatably attached to the valve body for connecting the hemostasis valve to another instrument. The first and second valves are selectively operable to create an opening through the passage respectively of a diameter to permit admittance of at least one intravascular instrument through at least one of the first and second valves while maintaining hemostasis. The second valve is rotatably attached to the valve body without effecting the diameter of the passage therethrough.

A thrombectomy catheter device having an improved hemostasis valve which is self-sealing and which functions as a one-way valve. The self-sealing hemostasis valve can be factory preset to automatically seal with or without the inclusion of a guidewire at a certain desired pressure or allowable leakage. Such sealing is automatic without the need to manually manipulate a hemostasis nut to obtain hemostasis. The thrombectomy catheter device can, without hemostasis nut adjustment, be positioned along and about a guidewire while yet maintaining suitable pressure for sustaining hemostasis at a preferred level. Certain embodiments of the thrombectomy catheter device having a self-sealing hemostasis valve include an adjustable hemostasis nut which can be manually tightened to restrict flow or guidewire movement or loosened to reduce friction on the guidewire and allow fluid to flow out if desired. An introducer facilitates free passage of a guidewire in either direction through the hemostasis nut and hemostasis valving and can also be incorporated to purge internal air or fluids.

A tearaway introducer sheath assembly (100,200) having an integrated valve (300). The valve is seated within a valve housing (222) defined by the hub portion (200) of the sheath (200). The valve (300) includes a pair of distally extending opposed side walls or flaps (324) extending to converge at a distal tip (328) having a virtual opening (334) therethrough. The valve further includes a pair of tensioners (340) along outer surfaces of the opposed side walls (324) that extend radially outwardly to engage and bear against the interior valve housing surface (230) to press the opposed side walls (324) together at the distal tip (328) for sealing, both when a dilator extends through the valve and sheath and afterward upon removal of the dilator.

A method of placing a catheter into a patient while preventing disadvantageous escape of fluid from the patient comprises providing a catheter secured to a valve hosing. The catheter has a proximal end, a distal end and an interior lumen. The valve housing has a first port, a second port, and a fluid path running between the first and second ports. The catheter and the valve housing have a hollow needle extending therethrough. The method further comprises piercing the patient's skin, thereby inserting the catheter into the patient. The method further comprises holding the catheter and valve housing in place while removing the hollow needle through the catheter and valve housing. The hollow needle passes through the first and second ports of the valve housing.

A hemostasis valve is disclosed herein. The hemostasis valve may include an inner bushing, a rotation sleeve, an elastomeric sleeve, and a biasing element. The rotation sleeve may extend about the inner bushing and be rotationally displaceable relative to the inner bushing. The elastomeric sleeve may include a first end operably coupled to the inner bushing, a second end operably coupled to the rotation sleeve, and an iris valve portion. Rotation of the rotation sleeve relative to the inner bushing may cause the iris valve to transition from an open state to a closed state. The biasing element may act between the rotation sleeve and inner bushing to bias the iris valve towards at least one of a closed state or an open state.

A valved connector apparatus is described having an integral opening and closing system operated by axial movement of the valve. The body of the valved connector apparatus is in a Y-shaped configuration with a main channel and a lateral channel branching off of the main channel. A normally dosed, passive hemostasis valve is housed in a valve body that is slidably connected to the proximal end of the main channel. The hemostasis valve is opened by sliding the valve body distally with respect to the Y-shaped connector body so that a cylindrical extension extending from the proximal end of the Y-shaped connector body penetrates a central opening in the hemostasis valve, creating an open passage for insertion of guidewires, catheters or other instruments. The valved connector apparatus allows safe introduction of extremely flexible or fragile guidewires, catheters or other instruments.

A method of placing a catheter into a patient while preventing disadvantageous escape of fluid from the patient comprises providing a catheter secured to a valve hosing. The catheter has a proximal end, a distal end and an interior lumen. The valve housing has a first port, a second port, and a fluid path running between the first and second ports. The catheter and the valve housing have a hollow needle extending therethrough. The method further comprises piercing the patient's skin, thereby inserting the catheter into the patient. The method further comprises holding the catheter and valve housing in place while removing the hollow needle through the catheter and valve housing. The hollow needle passes through the first and second ports of the valve housing.

A hemostasis valve that is closed when not accessed, but which provides an unobstructed fluid pathway when accessed by a luer fitting / connector. An auto-closure valve within the hemostasis valve housing is flush with a top surface thereof, allowing easy cleaning (swabable) and maintenance when not accessed. When accessed with a connector or luer fitting, the valve opens completely, allowing an unobstructed high flow fluid path.

A hemostasis valve is disclosed herein. The hemostasis valve may include an inner bushing, a rotation sleeve, an elastomeric sleeve, and a biasing element. The rotation sleeve may extend about the inner bushing and be rotationally displaceable relative to the inner bushing. The elastomeric sleeve may include a first end operably coupled to the inner bushing, a second end operably coupled to the rotation sleeve, and an iris valve portion. Rotation of the rotation sleeve relative to the inner bushing may cause the iris valve to transition from an open state to a closed state. The biasing element may act between the rotation sleeve and inner bushing to bias the iris valve towards at least one of a closed state or an open state.

A hemostasis valve that is closed when not accessed, but which provides an unobstructed fluid pathway when accessed by a luer fitting / connector. An auto-closure valve within the hemostasis valve housing is flush with a top surface thereof, allowing easy cleaning (swabable) and maintenance when not accessed. When accessed with a connector or luer fitting, the valve opens completely, allowing an unobstructed high flow fluid path.

A variable hemostasis valve is disclosed that may be used during medical procedures to prevent blood loss while permitting the percutaneous introduction, operation, and removal of medical instruments. A flexible tubular seal element is disclosed that is disposed within the variable hemostasis valve to provide a fluid-tight, adjustable seal. After insertion of a medical instrument into the valve through at least a portion of the flexible tubular seal element, a proximal portion of the valve housing may be rotated to cause the tension of the flexible tubular seal element to increase over the inserted medical instrument and engage the valve in a closed position. The proximal portion of the valve housing may then be rotated in an opposite direction to release the seal and return the tubular seal element to a relaxed lumen open position.

The invention is directed to a sealing apparatus for sealing around a medical instrument, the sealing apparatus comprising a housing body; a two-piece cam body disposed inside the housing body; a sealing member disposed inside the cam body and having a channel extending axially of the cam body, the sealing member having at least two protrusions disposed around the channel; a plurality of pins operable to engage with the protrusions of the sealing member for movement relative to the cam body to radially compress the sealing member against and form a seal around the medical instrument; and biasing means for compressing the sealing member. In one aspect of the invention, the biasing means includes a first finger tab fixed to and extending laterally from the housing body, a second finger tab operatively associated with the cam body for movement relative to the housing body, the second finger tab extending laterally from the housing body in apposition to the first finger tab, and a spring being disposed between the first and second finger tabs to normally force the finger tabs apart. In another aspect, the protrusions in the cam body are more than two in number and are disposed around the channel at substantially equally spaced angular intervals. In another aspect, at least one of a radius, width, length, and angle of engagement of the pins may be varied or changed to exert different pressure against the surface of the protrusions. In another aspect, a process of assembling the sealing apparatus of the invention is disclosed, the process comprising the steps of placing the pins onto or against the protrusions of the sealing member; placing a first cam body half and a second cam body half over the sealing member and joining the two cam body halves together forming the 2-piece cam body; placing the housing body over the cam body; and placing the biasing means over the cam body inside the housing body.

This invention is an air block for industrial, medical, and non-medical uses. For example, the air block is connected to the proximal end of a vascular access catheter. The air block is either removably connected to the proximal end of the catheter or it is integral to the proximal end of the catheter. The air block permits introduction of other catheters or instrumentation through its central lumen and on into a lumen of the catheter while minimizing fluid loss or gain into the catheter. The air block further prevents air from entering the catheter and provides for removal of the air or other gas from the central lumen before it can enter the catheter where it could cause harm to the patient. The air block can be attached to various standard proximal catheter terminations including Luer fittings and hemostasis valve outer barrels.

The invention discloses a guide wire and catheter system for radiofrequency ablation of renal artery sympathetic nerves, and aims to solve the problem that in the prior art, the position of a radiofrequency ablation electrode can not be well adjusted, so that the safe and efficient ablation can not be realized. The guide wire and catheter system comprises a radiofrequency ablation catheter, a guide wire sleeved by the radiofrequency ablation catheter, a loading sheath and a Y-shaped hemostasis valve arranged at the tail end of the radiofrequency ablation catheter, wherein the radiofrequency ablation catheter is sleeved by the loading sheath. By the adoption of the guide wire and catheter system, the bilateral renal artery sympathetic nerve radiofrequency ablation can be realized more accurately, safely and efficiently, and a more excellent catheter solution is provided for patients with hypertension.

An assembly for the delivery of a cardiac surgical device is disclosed herein. In one embodiment, the assembly includes a slittable delivery device and a bypass assembly. The slittable delivery device may include a hub, a shaft integrated into the hub and forming at least a segment of the circumferential surface of the hub, and a hemostasis valve contained substantially within the hub. The bypass assembly may include a cap and a valve bypass tool. The cap may be on a proximal end of the hub and may include an opening in the cap extending radially outward from a point near a radial center of the cap through a circumferential edge of the cap. The valve bypass tool may be operably coupled to the cap and may include a longitudinally extending open channel.

The invention relates to a blood vessel thrombus-taking device with spine-shaped structures and a thrombus therapeutic instrument thereof. The blood vessel thrombus-taking device comprises a thrombus-taking instrument, a development ring located at the near-end of the thrombus-taking instrument and a development coil located at the far-end of the thrombus-taking instrument. The thrombus-taking instrument comprises a mesh tubular or cage-shaped structure composed of a plurality of mutually connected unit grids, and each unit grid is formed by embracement of mutually connected ribs. The ribs of the unit grids are provided with the spine-shaped structures respectively, and each spine-shaped structure extends into an outer cavity. The thrombus therapeutic instrument comprises the blood vessel thrombus-taking device with the spine-shaped structures, a protective sheath tube, a conveying wire, a micro catheter, a guide catheter and a rotary hemostasis valve. The micro catheter is pushed to the thrombus position in the guide catheter along the guide catheter, the protective sheath tube is communicated with the micro catheter through the rotary hemostasis valve, and the thrombus-taking instrument is placed in the protective sheath tube and pushed into the micro catheter through the conveying wire. The blood vessel thrombus-taking device is good in flexibility, and the thrombus-taking instrument can make the damage to the blood vessel wall smallest by bending a blood vessel or reaching a thin blood vessel at the far-end.

A hemostasis valve may be used with a catheter such as an aspiration catheter. The hemostasis valve comprises a support, and at least a first lever, pivotably carried with respect to the support. A collapsible tubular sidewall defining a valve lumen is carried by the support. A filament is formed into a loop around the tubular sidewall, the filament having at least a first tail portion extending away from the loop to the first lever. A first spring may be configured to move the first lever in a direction that pulls the first tail portion away from the tubular sidewall, reducing the diameter of the valve lumen in response to reducing the diameter of the loop. A second tail portion may extend away from the loop to a second lever. Each tail portion may be attached to its respective lever, or may be slidably advanceable around a fulcrum on the lever and attached with respect to the support.

A hemostasis valve for a vascular introducer includes a valve body having a seal region with opposed first and second end surfaces and a central axis extending through the seal region perpendicular to the first and second end surfaces. The first end surface of the seal region has a first grouping of cut lines formed on the first end surface and extending radially outward from the central axis. The second end surface of the seal region has a second grouping of cut lines formed on the second end surface and extending radially outward from the central axis. The first circumferential grouping of intersecting cut lines is axially aligned with and angularly offset from the second circumferential grouping of cut lines. A pair of planar slits extend angularly away from each cut line in the first end surface, through the valve body, to a respective pair of oppositely adjacent cut lines in the second end surface.

The invention discloses an interventional medical instrument delivering system. The system comprises a catheter with a hemostasis valve of which an opening is adjustable, the catheter comprises a pipe fitting and a hemostasis valve main body, and the near end of the pipe fitting is connected with the far end of the hemostasis valve main body; the system further comprises a silica gel ring and a screw cap, the screw cap is connected with the hemostasis valve main body through a thread at the near end of the hemostasis valve main body, and the size of an opening formed in the near end of the hemostasis valve main body is adjusted by rotatably compressing or loosening the silica gel ring through the thread; the side face of the hemostasis valve main body is provided with a side hole used for being connected with a hose and a three-way valve, and an injection syringe can be connected to the hemostasis valve main body through the three-way valve to inject medicine. According to the interventional medical instrument delivering system, adjusting operation on the opening of the hemostasis valve of the catheter is easy and convenient, the condition that blood overflows and gas enters the body of a patient in the using process can be avoided, an operator can conveniently inject medicine to the patient in case of need, therefore, the catheter intervention treatment effect can be effectively improved, the operation safety is improved, and the operation success rate is increased.