Over-the-wire detachment mechanism

• US 8,257,422 B2
• Filed: 08/19/2009
• Issued: 09/04/2012
• Est. Priority Date: 08/19/2009
• Status: Active Grant

• Current Assignee: Cook Medical Incorporated (Cook Group Incorporated)
• Original Assignee: Cook Medical Incorporated (Cook Group Incorporated)
• Inventors: Schaeffer, Darin G., Melsheimer, Jeffry S.
• Primary Examiner(s): Severson, Ryan
• Assistant Examiner(s): CRONIN, ASHLEY L
• Application Number:
  US12/543,941
• Publication Number:
  US 20110046610A1
• Time in Patent Office: 1,112 Days
• Field of Search: 606/108, 606/191, 606/198, 606/200, 606/194, 623/1.11
• US Class Current: 623/1.11
• CPC Class Codes: A61M 2039/0232 having means for facilitating the insertion into the body
• CPC Class Codes: A61M 2039/0291 method or device for implanting it in the body
• CPC Class Codes: A61M 25/01 Introducing, guiding, advancing, emplacing or holding catheters A61M25/10 takes precedence
• CPC Class Codes: A61M 39/10 Tube connectors; Tube couplings A61M39/02 takes precedence; connecting needles to syringes or hubs A61M5/34; connecting catheter tubes to hubs A61M25/0014

Abstract

A detachment mechanism, and methods of use, for use in delivering a medical device preferably over a guidewire are provided. The detachment mechanism includes a first and second engagement member. The members are configured to receive the guidewire and have a first end attached to the control member and the device, respectively, a second end, and a notch formed in the body to form an interlocking tooth. The notch is sized to receive the interlocking tooth of the other member. The members are interlockable to couple the medical device to the control member and to allow the guidewire to pass therethrough. The notch can be angled to permit easier detachment between the members and for better torqueability and pushability/pullability between the control member and the medical device. The members can also include a bend region configured to enhance bendability along a portion of the members.

Claims

1. A detachment mechanism for use in delivering a medical device using a control member over a guidewire comprising:

a first engagement member including a tubular body having a lumen about a longitudinal axis and configured to receive said guidewire, the first engagement member having a proximal end attached to said control member, a distal end, and at least two notches formed in the tubular body of the first engagement member proximate the distal end thereof to define at least two interlocking teeth having ring-like structures, the notches of the first engagement member being angled at a first acute angle through the tubular body relative to the longitudinal axis; and

a second engagement member including a tubular body having a lumen about a longitudinal axis and configured to receive said guidewire, the second engagement member having a proximal end, a distal end attached to said medical device, and at least two notches formed in the tubular body of the second engagement member to define at least two interlocking teeth having ring-like structures, the notches of the second engagement member being angled at a second acute angle through the tubular body relative to the longitudinal axis,

wherein the notches of each of the first and second engagement members is sized to receive the interlocking teeth of the other of the first and second engagement members such that the first and second members are interlockable to couple said control member to said medical device disposed distal thereto, wherein, when coupled, the lumens of the first and second engagement members are in communication with one another such that said guidewire is passable therethrough.

2. The detachment mechanism of claim 1, wherein each of the first and the second angles further comprises an acute angle facing in a proximal direction.

3. The detachment mechanism of claim 1, wherein each of the first and the second angles further comprises an acute angle facing in a distal direction.

4. The detachment mechanism of claim 1, wherein the first and second angles are in a range of about 30 to about 60 degrees.

5. The detachment mechanism of claim 1, wherein at least one of the first and second engagement members further comprises a bend region configured to facilitate bending of said engagement member.

6. The detachment mechanism of claim 5, wherein the bend region comprise a slit disposed at a portion of the body opposite the interlocking teeth, the slit comprising a middle region interposed between ends, wherein the middle region of the slit is larger than at the ends to form an oblong shape.

7. The detachment mechanism of claim 1, wherein each of the distal end of the first engagement member and the proximal end of the second engagement member is angled at an acute angle substantially identical to the respective first and second angles.

8. The detachment mechanism of claim 1, wherein each of the first and second engagement members further comprises a relief portion removed from a portion of the body opposite the interlocking teeth, the removed relief portion formed contiguous with each of the distal end of the first engagement member and the proximal end of the second engagement member.

9. The detachment mechanism of claim 1, wherein the notches of each of the first and second engagement members further comprises a rounded end adapted to reduce stress risers.

10. The detachment mechanism of claim 1, wherein each of the notches of the first engagement member extends circumferentially around a majority of the tubular body with the center of the notches disposed distal from ends of the notches, each of the interlocking teeth of the first engagement member being disposed distal from one of the notches and extending circumferentially around a majority of the tubular body with the center of the interlocking teeth disposed distal from ends of the interlocking teeth, and each of the notches of the second engagement member extends circumferentially around a majority of the tubular body with the center of the notches disposed proximal from ends of the notches, the interlocking teeth of the second engagement member being disposed proximal from one of the notches and extending circumferentially around a majority of the tubular body with the center of the interlocking teeth disposed proximal from ends of the interlocking teeth.

11. A detachment mechanism for use in delivering a medical device using a control member comprising:

a first engagement member and a second engagement member each including a tubular body having a lumen about a longitudinal axis configured to receive a wire, each of the first and second engagement members having a first end connected to said respective control member and medical device, a second, opposite end, and at least two notches formed in the tubular body proximate the second end thereof to form at least two interlocking teeth having ring-like structures,

the two notches of the engagement members being sized to receive the interlocking teeth of the other engagement member, wherein the first and second engagement members are interlockable to couple said medical device to said control member, wherein when coupled the lumens of each of the first and second members are in communication such that said wire is passable therethrough,

wherein each of the first and second engagement members includes a bend region configured to enhance bendability along a portion opposite the interlocking teeth of the first and second engagement members.

12. The detachment mechanism of claim 11, wherein the notches further comprise a first notch and a second notch to form a first interlocking tooth having a ring-like structure and a second interlocking tooth having a ring-like structure proximal to the first interlocking tooth.

13. The detachment mechanism of claim 12, wherein the bend region is disposed at a portion of the body opposite the second interlocking tooth.

14. The detachment mechanism of claim 12, wherein the body of each of the first and second engagement members further comprises a relief portion removed from a portion of the body opposite the first interlocking tooth and contiguous with the second end of the engagement member.

15. The detachment mechanism of claim 12, wherein each of the first and second notches is angled at an acute angle relative to the longitudinal axis.

16. The detachment mechanism of claim 15, wherein the second end of each of the first and second engagement members is angled at an acute angle substantially identical to the acute angle of the notches.

17. The detachment mechanism of claim 11, wherein the notches have a width of up to about 10% larger than a width of the interlocking teeth, and a depth in a range of between about 50% to about 90% of an outer diameter of the engagement member.

18. The detachment mechanism of claim 11, wherein each of the notches of the first engagement member extends circumferentially around a majority of the tubular body with the center of the notches disposed distal from ends of the notches, each of the interlocking teeth of the first engagement member being disposed distal from one of the notches and extending circumferentially around a majority of the tubular body with the center of the interlocking teeth disposed distal from ends of the interlocking teeth, and each of the notches of the second engagement member extends circumferentially around a majority of the tubular body with the center of the notches disposed proximal from ends of the notches, the interlocking teeth of the second engagement member being disposed proximal from one of the notches and extending circumferentially around a majority of the tubular body with the center of the interlocking teeth disposed proximal from ends of the interlocking teeth.