Shaping device
View Patent ↗An elongate element, in particular a catheter, has a curved shape imparted to its end by a device comprising razor blades which are mounted on a pivotal linkage mechanism. Upon pressing actuator members against the restoring force of spring elements, the razor blades are constrained by the pivotal linkage mechanism to follow a desired curved path.
1. A device for imparting a curved shape to an end of an elongate tubular element, the device comprising a support member and at least one cutting member mounted on the support member to move relatively thereto, the cutting member being connected to the support member by means of a pivotal linkage mechanism, the pivotal linkage mechanism constraining the cutting member to move along a path to define said curved shape as said cutting member moves relative to the support member, said curved path intersecting a longitudinal axis of the elongate tubular element, and at least one articulating member arranged to cause said movement of the cutting member,
wherein the cutting member is an elongate member having a first cutting end and a second non-cutting end that is opposite the first cutting end, and said pivotal linkage mechanism comprises a plurality of links connected to said cutting member at spaced apart locations by a plurality of pivot elements.
2. A device according to claim 1 , wherein at least one of said plurality of links is connected to the support member.
3. A device corresponding to claim 2 , wherein a first of said plurality of links is pivotally connected to the support member, and a second of said plurality of links is slidingly connected to the support member, said sliding connection being movable along an axis parallel to the longitudinal axis of the elongate element.
4. A device according to claim 2 , wherein the first cutting end of the cutting member is connected to a first link and the second non-cutting end of the cutting member is connected to a second link, and said actuating member is arranged to engage said first link so as to move said cutting member along said curved path.
5. A device according to claim 1 , wherein said pivotal linkage mechanism comprises a resilient element acted upon by said actuating member as the pivotal linkage mechanism causes said movement of the cutting member from an initial disposition, said resilient member being arranged, upon release of said actuating member, to return said actuating member and the cutting member to the initial disposition.
6. A device according to claim 1 comprising two cutting members arranged in a substantially mirror symmetrical manner to cut said elongate element from opposite sides.
7. A device for cutting a desired curved shape in the end of a catheter comprising a housing, a first member having a first, cutting end and a second end, a second cutting member having a first, cutting end and a second end, a pivotal mechanism located in said housing and comprising first, second, third and fourth links, said first and second links being pivotally connected by a first pivot element, said first pivot element being fixed to said housing, said third and fourth links being pivotally connected by a second pivot element, said second pivot element being slidably mounted in said housing, said first link being pivotally connected by a third pivot element to said first end of said first cutting member, said third link being pivotally connected by a fourth pivot element to said second end of said first cutting member, said second link being pivotably connected by a fifth pivot element to said first end of said second cutting member, and said fourth link being pivotally connected by a sixth pivot element to said second end of said second cutting member, a first actuating member arranged to slide relative to said housing from a first position to a second position, said first actuating member engaging said first link to cause movement of said first cutting member to impart said desired curved shape to the catheter, a second actuating member arranged to slide relative to said housing from a first position to a second position, said second actuating member engaging said second link to cause movement of said second cutting member to impart said desired curved shape to the catheter, a first resilient member for returning said first actuating member from said second position to said first position, and a second resilient member for returning said second actuating member from said second position to said first position.
8. A device according to claim 7 , wherein said housing comprises a wall having a slot therein and said second pivot element is connected to a bearing arranged to slide in said slot, and wherein said first and second resilient members are coil springs connected between said first and second links respectively and said bearing.