STENT DELIVERY SYSTEM WITH PLUNGER ASSEMBLY Russian patent published in 2015 - IPC A61F2/966 

FIELD: medicine.

SUBSTANCE: group of inventions refers to medical equipment, namely to devices and methods for stent delivery into a body vessels. A plunger assembly for a stent delivery device comprises a distal end of an elongated inner element and a stent coupling element having a proximal end and a distal end. The proximal end of the stent coupling element is found at least partially inside the distal end of the elongated inner element. The stent coupling element comprises a segment, which extends in the radial direction outwards to the distal end of the stent coupling element. The stent coupling element is configured to move the stent if advanced in the distal direction, and to keep stent immobile if retracted in the proximal direction. The stent coupling element has a notch. The elongated inner element comprises an inner layer filling the notch at least partially. The stent delivery device comprises an elongated outer element at least partially forming an outer element lumen; the elongated inner element is coaxially positioned inside the outer element lumen, and the above plunger assembly. A method for producing the plunger assembly involves the stage of mechanical attachment of the proximal end of the stent coupling element at least partially inside the distal end of the elongated inner element. The stage of mechanical attachment involves filling the notch with the inner layer at least partially. The stent delivery system comprises a stent and a stent delivery catheter. The stent has a radially compressed configuration and a radially extended configuration. The stent has a proximal end, a distal end, a length between the proximal and distal lengths and a set of lengthwise holes. The stent delivery catheter comprises an elongated tubular element having a proximal end and a distal end; an elongated inner tubular element having a proximal end and a distal end, and the stent coupling element. The stent is kept in the radially compressed configuration inside the distal end of the outer tubular element. The inner tubular element extends inside the outer tubular element, and forms a wire guide lumen at least partially. The stent coupling element is configured to couple the stent holes if the stent advances in the distal direction with respect to the elongated outer tubular elements to make the stent project in the distal direction from the elongated outer tubular element, and configured to slide past the stent holes if it is retracted in the proximal direction with respect to the elongated outer tubular element. The stent coupling element forms the wire guide lumen at least partially and comprises a notch. The elongated inner tubular element comprises an inner layer filling the notch at least partially. The stent coupling elements comprises a latch having a proximal end and a bucket-type distal end, and a rod provided inside the latch and coupled thereto. The rod has a proximal end extending in the proximal direction with respect to the proximal end of the latch, a distal end extending in the distal direction towards the distal end of the latch; and a handle at the proximal end of the outer tubular element and the proximal end of the inner tubular element. The proximal end of the latch is found at least partially inside the distal end of the elongated inner element. The handle is configured at least partially to control the relative motion of the outer tubular element and the inner tubular element.

EFFECT: inventions provide extending the range of technical facilities in the above application.

38 cl, 16 dwg