Insertion instrument for anchor assembly
An insertion instrument is configured to eject at least one anchor body into respective target locations, and subsequently apply a predetermined tensile force at least one actuation member of the at least one anchor member so as to actuate the at least one anchor body from a first configuration to a second expanded configuration. The insertion instrument can include a tension assembly that applies the predetermined tensile force to the at least one actuation member. The predetermined tensile force can be defined by a distance of travel, a predetermined failure force of a fuse, or a combination of distance of travel and a predetermined failure force of a fuse.
1. An insertion instrument, comprising:
an access member elongate along a longitudinal direction, the access member defining:
a proximal end and a distal end spaced from the proximal end along the longitudinal direction, the distal end configured to be at least partially inserted into a target location; and
a cannulation extending through the access member along the longitudinal direction;
an opening creating member configured to be inserted into the cannulation, the opening creating member defining a proximal end and an opposed distal end that defines a tip configured to penetrate tissue at the target location, wherein the opening creating member further defines a contact surface intermediate with respect to the proximal and distal ends of the opening creating member, the contract surface configured to abut the access member when the opening creating member is fully inserted into the cannulation;
an anchor housing that releasably carries at least one anchor, the anchor housing configured to be aligned with the access member; and
a tension assembly configured to apply a predetermined tension force characteristic to an actuation member that extends from the at least one anchor substantially along the longitudinal direction, thereby causing the at least one anchor to expand.
2. The insertion instrument of claim 1 , wherein the opening creating member further defines a shaft extending from the tip toward the proximal end of the opening creating member, the shaft defining an outer diameter.
3. The insertion instrument of claim 2 , wherein the tip defines a base portion, and the tip is a conical tip that tapers distally from the base portion.
4. The insertion instrument of claim 3 , wherein the base portion defines a diameter that is slightly smaller than the outer diameter of the shaft so as to define a ledge adjacent the base portion, the ledge configured to core tissue when the conical tip penetrates tissue.
5. The insertion instrument of claim 2 , wherein the shaft defines at least one boring flute extending helically from the tip along a direction toward the proximal end of the opening creating member, the at least one boring flute configured to create an opening at the target location by boring tissue material from the target location.
6. The insertion instrument of claim 1 , wherein the proximal end of the access member defines a first interlocking member and the opening creating member defines a second interlocking member configured to engage the first interlocking member, wherein when the first and second interlocking members are engaged the access member and the opening creating member are prevented from translating with respect to one another along the longitudinal direction.
7. The insertion instrument of claim 1 , wherein the cannulation is a first cannulation, the first cannulation extends along the longitudinal direction and is sized to receive therein at least a portion of the anchor housing, and the anchor housing defines a second cannulation extending therethrough along the longitudinal direction.
8. The insertion instrument of claim 7 , further comprising a pusher member having a portion that is insertable into the second cannulation in a manner to eject the at least one anchor from the anchor housing and out the distal end of the access member.
9. The insertion instrument of claim 8 , wherein the pusher member defines a third cannulation extending therethrough along the longitudinal direction, and the third cannulation is sized to receive at least a portion of the actuation member therein.
10. The insertion instrument of claim 1 , wherein the contact surface is a first contact surface, the access member defines a second contact surface at the proximal end of the access member, and the first contact surface is configured to abut the second contact surface when the opening creating member is fully inserted into the cannulation.
11. The insertion instrument of claim 10 , wherein the anchor housing defines a proximal end, an opposed distal end, and a third contact surface that is intermediate with respect to opposed proximal and distal ends of the anchor housing.
12. The insertion instrument of claim 11 , wherein the third contact surface abuts the second contact surface when the anchor housing is fully inserted with respect to the access member.
13. The insertion instrument of claim 12 , wherein the anchor housing defines a fourth contact surface at the proximal end of the anchor housing, and the fourth contact surface is configured to abut a fifth contact surface defined by a pusher member configured to eject the at least one anchor from the anchor housing and out the distal end of the access member.
14. The insertion instrument of claim 13 , wherein the pusher member defines a proximal end and an opposed distal end, and the fifth contact surface is intermediate with respect to proximal and distal ends of the pusher member.
15. The insertion instrument of claim 1 , wherein the tension assembly comprises a translating member configured to translate from a neutral position to an extended position with respect to the distal end of the access member so as to cause the at least one anchor to expand along a second direction that is angularly offset with respect to the longitudinal direction.
16. The insertion instrument of claim 15 , wherein the predetermined tension force characteristic is a predetermined distance, wherein the translating member translates from the neutral position to the extended position the predetermined distance so as to cause the at least one anchor to expand.
17. The insertion instrument of claim 16 , wherein, when the translating member is attached to the actuation member, the translating member applies a tensile force to the actuation member as the translating member translates the predetermined distance with respect to the distal end of the access member.
18. The insertion instrument of claim 17 , further comprising a rotatable member that causes the translating member to translate the predetermined distance.
19. The insertion instrument of claim 1 , wherein the anchor housing defines a second cannulation that extends in the longitudinal direction and is configured to releasably carry the at least one anchor therein.
20. The insertion instrument of claim 19 , wherein the second cannulation is configured to allow the at least one anchor to translate within the cannulation along the longitudinal direction responsive to a force applied to the at least one anchor by a pusher member.
21. The insertion instrument of claim 20 , wherein the second cannulation is configured such that the at least one anchor will not fall out of the anchor housing.