Vascular-malformation implant system

An implant system comprising:

• (a) an implant, which comprises:
• (i) an implant wire, which includes (A) a coil-wire portion having a coil-wire-portion diameter and (B) a proximal end portion that (1) includes a proximal end of the implant wire, (2) is non-axially-overlapping with the coil-wire portion, and (3) includes a retention portion that has a retention diameter that is greater than the coil-wire-portion diameter;
• and
• (ii) a coil, which is coiled around the coil-wire portion and not the proximal end portion of the implant wire;
• and
• (b) a delivery tool, which comprises:
• (i) a delivery tube;
• (ii) a tubular distal tip, which is (A) fixed to a distal end of the delivery tube and (B) shaped so as to define a tip distal opening, wherein the retention portion is removably disposed within the tubular distal tip;
• (iii) a safety wire, which (A) has a proximal end portion that is shaped so as to define a safety-wire hook and (B) is removably disposed partially within the tubular distal tip, with a distal portion of the safety wire passing through the tip distal opening so as to effectively reduce a size of the tip distal opening to be too small for the retention portion to pass through, thereby retaining the retention portion within the tubular distal tip;
• and
• (iv) a pull wire, which (A) has a distal end portion that is shaped so as to define a pull-wire loop and (B) is removably disposed partially within the delivery tube, wherein the safety-wire hook is hooked on the pull-wire loop,
• wherein the implant system is configured such that proximal pulling on the pull wire proximally retracts the safety wire from the tip distal opening, thereby allowing the retention portion to pass through the tubular distal tip.

An implant system comprising:

• (a) an implant, which comprises:
• (i) an implant wire, which includes (A) a coil-wire portion having a coil-wire-portion diameter and (B) a proximal end portion that (1) includes a proximal end of the implant wire, (2) is non-axially-overlapping with the coil-wire portion, and (3) includes a retention portion that has a retention diameter that is greater than the coil-wire-portion diameter;
• and
• (ii) a coil, which is coiled around the coil-wire portion and not the proximal end portion of the implant wire;
• and
• (b) a delivery tool, which comprises:
• (i) a delivery tube;
• (ii) a tubular distal tip, which is (A) fixed to a distal end of the delivery tube, (B) shaped so as to define a tip distal opening, and (C) tapers toward the tip distal opening, wherein the retention portion is removably disposed within the tubular distal tip;
• and
• (iii) a safety wire, which is removably disposed partially within the tubular distal tip, with a distal portion of the safety wire passing through the tip distal opening so as to effectively reduce a size of the tip distal opening to be too small for the retention portion to pass through, thereby retaining the retention portion within the tubular distal tip,
• wherein the implant system is configured such that proximal pulling on the safety wire proximally retracts the safety wire from the tip distal opening, thereby allowing the retention portion to pass through the tubular distal tip.

A method for treating a vascular malformation, the method comprising:

• inserting a microcatheter into a blood vessel while a delivery tool and an implant of an implant system are removably disposed in the microcatheter, with a proximal end of the implant removably coupled to a tubular distal tip of the delivery tool,
• wherein the implant includes (i) an implant wire, which includes (A) a coil-wire portion having a coil-wire-portion diameter and (B) a proximal end portion that (1) includes a proximal end of the implant wire, (2) is non-axially-overlapping with the coil-wire portion, and (3) includes a retention portion that has a retention diameter that is greater than the coil-wire-portion diameter;
• and (ii) a coil, which is coiled around the coil-wire portion and not the proximal end portion of the implant wire, and
• wherein the delivery tool includes (i) a delivery tube;
• (ii) a tubular distal tip, which is (A) fixed to a distal end of the delivery tube and (B) shaped so as to define a tip distal opening, wherein the retention portion is removably disposed within the tubular distal tip;
• and (iii) a safety wire, which (A) is removably disposed partially within the tubular distal tip, with a distal portion of the safety wire passing through the tip distal opening so as to effectively reduce a size of the tip distal opening to be too small for the retention portion to pass through, thereby retaining the retention portion within the tubular distal tip, and (B) is shaped so as to define a helical portion, which, when unconstrained, has an unconstrained helical-portion outer diameter that is greater than a greatest inner diameter of the tubular distal tip, such that the helical portion, when removably disposed within the tubular distal tip, pushes radially outwardly against an inner wall of the tubular distal tip;
• advancing the microcatheter in the blood vessel toward the vascular malformation;
• deploying the implant from the microcatheter into the vascular malformation;
• and
• releasing the implant from the delivery tool by proximally pulling on the safety wire so as to proximally retract the safety wire from the tip distal opening of the tubular distal tip, thereby allowing the retention portion to pass through the tip distal opening.

A method for treating a vascular malformation, the method comprising:

• inserting a microcatheter into a blood vessel while a delivery tool and an implant of an implant system are removably disposed in the microcatheter, with a proximal end of the implant removably coupled to a tubular distal tip of the delivery tool,
• wherein the implant includes (i) an implant wire, which includes (A) a coil-wire portion having a coil-wire-portion diameter and (B) a proximal end portion that (1) includes a proximal end of the implant wire, (2) is non-axially-overlapping with the coil-wire portion, and (3) includes a retention portion that has a retention diameter that is greater than the coil-wire-portion diameter;
• and (ii) a coil, which is coiled around the coil-wire portion and not the proximal end portion of the implant wire, and
• wherein the delivery tool includes (i) a delivery tube;
• (ii) a tubular distal tip, which is (A) fixed to a distal end of the delivery tube and (B) shaped so as to define a tip distal opening, wherein the retention portion is removably disposed within the tubular distal tip;
• (iii) a safety wire, which (A) has a proximal end portion that is shaped so as to define a safety-wire hook and (B) is removably disposed partially within the tubular distal tip, with a distal portion of the safety wire passing through the tip distal opening so as to effectively reduce a size of the tip distal opening to be too small for the retention portion to pass through, thereby retaining the retention portion within the tubular distal tip;
• and (iv) a pull wire, which (A) has a distal end portion that is shaped so as to define a pull-wire loop and (B) is removably disposed partially within the delivery tube, wherein the safety-wire hook is hooked on the pull-wire loop;
• advancing the microcatheter in the blood vessel toward the vascular malformation;
• deploying the implant from the microcatheter into the vascular malformation;
• and
• releasing the implant from the delivery tool by proximally pulling on the safety wire so as to proximally retract the safety wire from the tip distal opening of the tubular distal tip, thereby allowing the retention portion to pass through the tip distal opening.

A method for treating a vascular malformation, the method comprising:

• inserting a microcatheter into a blood vessel while a delivery tool and an implant of an implant system are removably disposed in the microcatheter, with a proximal end of the implant removably coupled to a tubular distal tip of the delivery tool,
• wherein the implant includes (i) an implant wire, which includes (A) a coil-wire portion having a coil-wire-portion diameter and (B) a proximal end portion that (1) includes a proximal end of the implant wire, (2) is non-axially-overlapping with the coil-wire portion, and (3) includes a retention portion that has a retention diameter that is greater than the coil-wire-portion diameter;
• and (ii) a coil, which is coiled around the coil-wire portion and not the proximal end portion of the implant wire, and
• wherein the delivery tool includes (i) a delivery tube;
• (ii) a tubular distal tip, which is (A) fixed to a distal end of the delivery tube, (B) shaped so as to define a tip distal opening, and (C) tapers toward the tip distal opening, wherein the retention portion is removably disposed within the tubular distal tip;
• and (iii) a safety wire, which (A) is removably disposed partially within the tubular distal tip, with a distal portion of the safety wire passing through the tip distal opening so as to effectively reduce a size of the tip distal opening to be too small for the retention portion to pass through, thereby retaining the retention portion within the tubular distal tip;
• advancing the microcatheter in the blood vessel toward the vascular malformation;
• deploying the implant from the microcatheter into the vascular malformation;
• and
• releasing the implant from the delivery tool by proximally pulling on the safety wire so as to proximally retract the safety wire from the tip distal opening of the tubular distal tip, thereby allowing the retention portion to pass through the tip distal opening,

A method for assembling an implant system, the method comprising:

• disposing a pull wire of a delivery tool partially within a delivery tube of the delivery tool;
• inserting a retention portion of a proximal end portion of an implant wire of an implant (a) through a tip distal opening of a tubular distal tip that is fixed to a distal end of the delivery tube and (b) into the tubular distal tip, wherein the implant wire further includes a coil-wire portion having a coil-wire-portion diameter, wherein the proximal end portion of the implant wire (a) includes a proximal end of the implant wire and (b) is non-axially-overlapping with the coil-wire portion, wherein the retention portion has a retention diameter that is greater than the coil-wire-portion diameter, and wherein a coil of the implant is coiled around the coil-wire portion and not the proximal end portion of the implant wire;
• utilizing a lateral access window defined by a wall of the tubular distal tip, hooking a safety-wire hook defined by a proximal end portion of the safety wire onto the pull-wire loop;
• inserting a distal portion of a safety wire through the lateral access window and into the tubular distal tip;
• and
• removably disposing the distal portion of the safety wire through the tip distal opening so as to effectively reduce a size of the tip distal opening to be too small for the retention portion to pass through, thereby retaining the retention portion within the tubular distal tip.