Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1994-07-27
1996-02-06
Rosenbaum, C. Fred
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604248, 604169, 604 53, A61M 5178, A61M 3100, A61M 500
Patent
active
054892740
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to through-channel valves and the like for medical applications, in particular, for the control of fluids and devices passing in or out of a patient's body. Operation of prior devices to some extent has been awkward and required more hand actions and the presence of more personnel than at times has been desirable.
BACKGROUND OF THE INVENTION
Catheters are placed inside blood vessels and body cavities, typically by being slid over guidewires. During placement, some way is needed to prevent backflow of blood or other fluid from the proximal end of the catheter. Many times it is also desirable, with minimum steps and effort, to attach a hand syringe to the proximal end of the catheter, open the catheter valve, inject fluids through the catheter and then remove the syringe and close the system. Many other applications require closure of a through-passage to, for example, control the flow of fluids as by a stopcock or to grip a device, such as a guidewire, to provide a handle to enable working the wire to achieve its insertion and accurate placement in the body.
While it is well known to use luer fittings for attachment of medical instruments, e.g. a syringe to a catheter, valves controlling flow that use luer fittings generally do not have through-passages and also, for the most part, require separate activating motions.
The attachment of an external instrument such as a syringe to the passageway of a closure device in a manner that also opens the closure device is also known, but in a form that has had significant limitations. Such a device, for example, is described in U.S. Pat. No. 4,243,034. The described device relies on an axial sliding motion for making the attachment and opening a valve by releasing one or more balls from depression into the wall of a resilient tube. This device is neither as simple nor as effective as desired by those in the field, and also fails to meet all needs for single-handed operation in flow-control devices.
Other known closure or wire-gripping devices provide partial benefits but fail to combine all desirable features in one unit. For example, one type of device, known as a Tuohy-Borst closure, comprises a cap which, when screwed on, axially compresses a captured thick-walled tubular segment (a grommet) to seal a passage through the tubular segment. This device is disadvantageous in that it requires many turns to seal the passage.
SUMMARY OF THE INVENTION
An object of the invention is to provide an improved device for closure of a through-passage for use, for example, as a valve for a catheter or as a gripping member for a device such as a guidewire placed in the through-passage or channel. Another object is to provide a closure device of a simple, rugged, inexpensive and durable construction that will not inadvertently disassemble by the activating motions. It is a further object to improve on the operation and configuration of closure devices for attachment and detachment to medical components, such as the attachment of a syringe to a catheter.
These objects are realized according to one aspect of the invention by a closure device based upon rotation of a rotary cam to displace a compression member against the side of a resilient tube. Such a closure device is, in one embodiment, constructed for both hand rotation and rotation by syringe, and the direction of rotation is the same for both attaching the syringe and opening a valve of the closure device.
These objects are further realized by a novel clamping or sealing device for clamping a guidewire or a catheter, operable in combination with an introducer sheath to prevent backflow of blood before or after insertion of the catheter or guidewire through the sheath; and by a kit comprising avena cava (e.g. Greenfield) filter, a stabilizer, a surrounding elongated placement catheter and an introducer sheath for insertion of the filter into the body.
The objects are further realized by a rotary valve that is opened by connecting motions of a syringe or the like, and closed by
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Chin Yem
Chu Michael S. H.
Cragg Andrew
Gellman Barry N.
Boston Scientific Corporation
Rosenbaum C. Fred
Wilkens III Frank
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