Patent number 8603071 is assigned to
The following quote was obtained by the news editors from the background information supplied by the inventors: "Introducer devices for introducing intravenously a stent, stent graft or other implant or prosthesis are typically provided with an outer sheath within which there is provided a deployment mechanism such as a pusher rod and dilator. The sheath has the function of containing the various components of the introducer device and in particular the implant therewithin during the intraluminal introduction procedure. This flexes and twists as it passes through the various lumens of the patient, until it reaches the location at which the device being carried needs to be implanted. The sheath is typically of a construction that it is flexible so can be passed relatively easily through lumens of a patient and yet is able to withstand rotational torque, which is important during the implant placement process, for example for rotating the implant at the implantation site to ensure that it is implanted in the correct orientation. For this purpose, the sheath is of a length that extends, normally, to a dilator tip at the distal end of the introducer device and also to outside the insertion site in the patient, for example to outside the femoral artery. This end is typically termed the proximal end. This proximal end of the sheath typically has fitted integral therewith a plurality of manipulation elements for controlling the introduction of the sheath into the patient, the release of the implant, as well as for supplying various fluids during the medical procedure, such as saline solution or necessary medicaments.
"Typically, the implant is located at the end of a pusher rod, which is itself flexible, which extends from the proximal to the distal ends of the deployment device and within the sheath.
"It is necessary for the implantation procedure to be able to lock the pusher rod and the sheath together and a number of devices have been disclosed in the past.
"For example, U.S. Pat. No. 5,064,414 discloses a locking clip which is clipped both to the pusher and to one of the grasping tabs of the sheath, the grasping tabs forming a handle for use by the surgeon. This locking unit limits the longitudinal movement of the pusher rod relative to the sheath until it is unlocked. However, the locking unit allows for rotation of the pusher relative to the sheath and some axial movement of the proximal end of the pusher relative to the proximal end of the sheath."
In addition to the background information obtained for this patent, VerticalNews journalists also obtained the inventors' summary information for this patent: "The present invention seeks to provide an improved locking unit for locking a sheath to a tubular or rod-like member to be held therewithin.
"According an aspect of the present invention, there is provided a locking unit for a medical deployment device, which medical device is provided with a sheath element located over an inner tubular or rod-like insert member; the sheath element and inner member being movable relative to one another; the locking unit including at least one resiliently deformable engagement member provided with one or more teeth able to grip onto an outer surface of the insert member.
"Advantageously, there are provided a plurality of deformable engagement members.
"The teeth have the advantage of providing a strong connection of the locking unit to the insert member without requiring tight contact of a large surface area of components of the locking unit. This has the advantage of facilitating the release of the locking unit from the insert member.
"In the preferred embodiment, there are provided a plurality of engagement members arranged in an annular form and a biasing member is provided with at least one biasing surface operable to bias the flexible members towards a reduced annular form and thereby into a locking position.
"There is preferably provided a locking nut operable to bias the engagement member or members towards a locking position.
"The nut is advantageously provided with an internal tapering surface operable to bias the engagement member or members in the locking direction. Advantageously, the biasing surface is a frusto-conical surface.
"It is preferred that the or each engagement member is provided with an outer surface for contact with the internal tapering surface of the nut which is curved in a longitudinal direction thereof.
"A locking unit in this form is able to prevent movement of the sheath towards the proximal end of the insert member.
"The device preferably includes a radial locking member. Advantageously, the radial locking member includes an engaging element operable to engage a feature of the assembly. Most preferably, the feature is a protrusion from an element of the sheath assembly, in the preferred embodiment a port of a fluid chamber provided in the sheath assembly.
"The radial locking member advantageously includes a forked latching element. Advantageously, the latching member is releasable from a locked condition by a twisting action. Thus, the latching element is preferably of a type which can be slid off a holding post integral with a sheath or sheath assembly. This enables easy removal of the locking unit from the sheath assembly by the surgeon, which is required in some instances during the intravenous medical procedures.
"According another aspect of the present invention, there is provided a locking unit for a medical deployment device provided with a sheath element located over an inner tubular or rod-like member, the locking unit including a forked latching element for latching the sheath to the insert member.
"It has been found that when the locking unit is locked to the introducer assembly prior to sterilisation, the act of sterilisation of the assembly softens the material of the insert member and as a result facilitates the unlocking of the locking unit during a medical procedure.
"Advantageously, this latch member is arranged to prevent longitudinal and rotational movement of the sheath relative to the insert member.
"It is preferred that both longitudinal and rotational movements are blocked. This has the advantage of reducing the relative torque between the sheath and the insert element, with the result that any movement of the insert element, such as the pusher, or of the sheath by whatever means ensures that such rotational movement causes rotation of the distal end of the introducer assembly as a cohesive unit. This is particularly advantageous for ensuring correct rotation and therefore placement of an implant in a patient. Of course, in cases where the introducer assembly is of a type which provides a medical treatment, rather than supplying an implant into a patient, this also ensures that any tool, medicament or the like, is located accurately at the desired position and orientation, without undue movement of the various components of the assembly relative to one another.
"The preferred embodiment thus provides a locking unit for locking a pusher to a sheath assembly. The locking unit includes a longitudinal locking portion and a radial locking portion. The longitudinal locking portion includes a plurality of cantilevered fingers provided with longitudinally extending teeth on internal surfaces thereof. A nut can be tightened in order to bias the cantilevered arms towards a pusher such that the teeth indent the outer surface of the pusher to produce a strong and stable locking connection thereto. The radial locking section latches onto the assembly integral with the sheath so as to provide a radial locking action as well as a longitudinal locking action. The locking unit provides a strong and reliable locking action between the pusher and the sheath assembly and can be easily removed by a clinician or surgeon during the deployment process."
URL and more information on this patent, see: Nimgaard, Lars S.; Ohlenschlaeger, Bent; Rasmussen, Erik E.. Locking Device for Sheath Or Catheter. U.S. Patent Number 8603071, filed
Keywords for this news article include: Technology.
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