1. A method for automatic recognition of speech comprising:
providing a knowledge base of phonetic features, each of said phonetic features associated with a corresponding set of acoustic correlates;
organizing said phonetic features into a hierarchy, said hierarchy including a broad manner sub-hierarchy of broad manner phonetic features and a fine phonetic feature sub-hierarchy of fine phonetic features, each of said broad manner phonetic features corresponding to a set of acoustic landmarks;
providing a pattern recognizer for determining a phonetic feature of said hierarchy from a set of acoustic correlates provided thereto and for determining for a phonetic feature of said hierarchy a probability measure of likelihood that said provided set of acoustic correlates is associated therewith;
training said pattern recognizer on said phonetic features and said each corresponding set of acoustic correlates of said knowledge base;
obtaining a speech signal, said speech signal including a sequence of speech frames;
extracting acoustic correlates from each frame of said sequence of speech frames;
classifying said acoustic correlates into set of broad manner classes via said pattern recognizer, said broad manner classes corresponding to said broad manner phonetic features;
determining locations of acoustic landmarks from said set of broad manner classes;
forming a plurality of possible landmark sequences from said acoustic landmarks;
computing for each possible landmark sequence a first probability measure of likelihood that said possible landmark sequence is representative of the speech;
determining from said acoustic correlates of a predetermined number of speech frames proximate to each of said acoustic landmarks a corresponding fine phonetic feature of said fine phonetic feature sub-hierarchy for each of said set of broad manner classes via to said pattern recognizer;
forming a plurality of possible fine phonetic feature sequences from said fine phonetic feature corresponding to each of said set of broad manner classes;
computing for each possible fine phonetic feature sequence a second probability measure of likelihood that said possible fine phonetic feature sequence is representative of the corresponding possible landmark sequence; and
combining a landmark sequence from said plurality of possible landmark sequences with a fine phonetic feature sequence from said plurality of possible fine phonetic feature sequences in accordance with a product of said first probability measure corresponding to said landmark sequence and said second probability measure corresponding to said fine phonetic feature sequence being among a predetermined number of maximum values of said product for all of said possible landmark sequences and all of said possible fine phonetic feature sequences.
2. The method recited in claim 1, where said hierarchy organizing step includes the step of organizing said hierarchy of said phonetic features as a binary tree.
3. The method as recited in claim 2, where said pattern recognizer providing step includes the step of providing a binary classifier at each decision branch in said binary tree to form a broad manner class pattern recognizer for classifying said broad manner phonetic features and a fine phonetic feature pattern recognizer for classifying said fine phonetic features.
4. The method as recited in claim 3, where said binary classifier providing step includes the step of providing a maximum margin classifier as said binary classifier.
5. The method as recited in claim 4; where said binary classifier providing step includes the step of providing a support vector machine as said maximum margin classifier.
6. The method as recited in claim 3, where said acoustic correlate classifying step includes the step of classifying said acoustic correlates via said broad manner class pattern recognizer.
7. The method as recited in claim 3, where said fine phonetic feature determining step includes the step of applying said acoustic correlates of said predetermined number of speech frames to said fine phonetic feature pattern recognizer.
8. The method as recited in claim 6, where said fine phonetic feature determining step includes the step of applying said acoustic correlates of said predetermined number of speech frames to said fine phonetic feature pattern recognizer.
9. The method as recited in claim 3, including the step of converting the output of said binary classifier to a classifier probability measure.
10. The method as recited in claim 9, where said first probability measure computing step includes the step of computing said first probability measure from said classifier probability measure from said binary classifier at each said decision branch of said broad manner class pattern recognizer.
11. The method as recited in claim 9, where said second probability measure computing step includes the step of computing said second probability measure from said classifier probability measure from said binary classifier at each said decision branch of said fine phonetic feature pattern recognizer.
12. The method as recited in claim 1, where said acoustic landmarks location determining step includes the step of identifying an acoustic landmark by one of the group consisting of a temporally abrupt change in a frequency spectrum representation of the speech and a locally prominent feature of a smoothly varying acoustic characteristic of said frequency spectrum representation.
13. The method as recited in claim 1, where said fine phonetic feature determining step includes the step of determining said fine phonetic feature corresponding to each said broad manner class from among only fine phonetic features of said fine phonetic feature sub-hierarchy produced by a pronunciation model responsive to said speech frames proximate to said acoustic landmarks.
14. The method as recited in claim 13, where said fine phonetic feature determining step includes the step of constructing said pronunciation model from Finite State Automata.
15. A system for automatic speech recognition comprising:
a knowledge base of phonetic features, each of said phonetic features associated with a corresponding set of acoustic correlates;
a front end processor for converting speech into a speech signal, said speech signal including a sequence of speech frames;
a broad manner pattern recognizer operative to determine a broad manner phonetic feature from a hierarchy of said phonetic features responsive to a set of acoustic correlates, said broad manner pattern recognizer coupled to said knowledge base so as to receive therefrom said phonetic features and said corresponding set of acoustic correlates as training data;
a landmark locator operative to determine acoustic landmarks from broad manner classes identified by said pattern recognizer, each of said broad manner classes corresponding to said broad manner phonetic feature of said hierarchy, said landmark locator further operative to compute a first probability measure of likelihood that an acoustic landmark sequence is representative of said speech; and
a fine feature detection module for determining a fine phonetic feature of said hierarchy from acoustic correlates of a predetermined number of said speech frames proximate to said acoustic landmarks, said fine feature detection module further operative to compute a second probability measure of likelihood that said fine phonetic feature is representative of a sequence of said acoustic landmarks, said fine feature detection module coupled to said knowledge base so as to receive therefrom said phonetic features and said corresponding set of acoustic correlates as training data, wherein a sequence of said fine phonetic features and a-sequence of said acoustic landmarks are candidates of likely feature bundles corresponding to said speech if a product of said first probability measure corresponding to said sequence of acoustic landmarks and said second probability measure corresponding to said sequence of fine phonetic features are among a predetermined number of maximum values of said product.
16. The system as recited in claim 15, wherein said front end processor includes an acoustic parameter extractor for extracting acoustic correlates from each speech frame of said sequence of speech frames, said acoustic parameter extractor coupled to said broad manner pattern recognizer for providing said acoustic correlates thereto.
17. The system as recited in claim 16, wherein said broad manner pattern recognizer includes an acoustic parameter sorter operative to select from said acoustic correlates received from said acoustic parameter extractor said set of acoustic correlates.
18. The system as recited in claim 15, wherein said fine feature detection module includes a constrained landmark detector and a fine phonetic feature detector, said constrained landmark detector including a pronunciation model responsive to said acoustic correlates of said speech frames proximate to said acoustic landmarks and operative to constrain said determination of said fine phonetic feature to only fine phonetic features of said hierarchy produced thereby, said fine phonetic feature detector including a pattern recognizer operative to perform said determination of said fine phonetic feature from said acoustic correlates of said predetermined number of said speech frames proximate to said acoustic landmarks as constrained by said pronunciation model.
19. The system as recited in claim 18, wherein said pronunciation model includes finite state automata for constraining said determination of said fine phonetic feature.
20. The system as recited in claim 18, wherein said broad manner pattern recognizer and said pattern recognizer in said fine phonetic feature detector include space vector machines for determining a phonetic feature from said hierarchy.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A system for inserting and securing, through a suprapatellar region of a leg, an intramedullary nail into a medullary canal of a bone, the system comprising:
a flexible sleeve configured to be partially inserted in the leg, the flexible sleeve defining a leading end and a trailing end spaced apart from the leading end in a proximal direction along a first axis, the flexible sleeve defining a first cannulation extending along the first axis between the leading and trailing ends, the first cannulation sized to receive therethrough at least the intramedullary nail, wherein the flexible sleeve is configured to flex so as to change a shape of the first axis from a first configuration to a second configuration, wherein the second configuration is different than the first configuration;
a rigid inner sleeve comprising a distal end, a trailing portion and an elongated shaft portion located between the distal end and the trailing portion;
a retaining device comprising a handle and a retaining member that extends from the handle, the retaining member configured to releasably lock to the trailing end of the flexible sleeve, the retaining device further configured to releasably lock to the trailing portion of the rigid inner sleeve while the elongated shaft portion is disposed within the first cannulation of the flexible sleeve such that the flexible sleeve and the rigid inner sleeve are prevented from movement with respect to the retaining member along the first axis both in the proximal direction and in a distal direction opposite the proximal direction, wherein the retaining member is configured to position the flexible sleeve through the suprapatellar region of the leg such that the flexible sleeve leading end is aligned with a proximal end of the bone,
wherein the intramedullary nail is insertable through the flexible sleeve and into the medullary canal.
2. The system of claim 1, further comprising an intramedullary nail, wherein the intramedullary nail defines a proximal end and a distal end, and at least one curved portion that is disposed at least between the proximal and distal ends of the intramedullary nail, and the flexible sleeve is configured to flex as the nail is inserted from the trailing end to the leading end.
3. The system of claim 2, wherein the retaining member comprises an upper surface and an opposed lower surface and an aperture extending from the upper surface to the lower surface where the aperture defines a center axis extending from the upper surface to the lower surface along a first direction, wherein the system further comprises an insertion device configured for removable connection to the intramedullary nail, wherein the intramedullary nail and at least a portion of the insertion device is configured to be received within the first cannulation of the flexible sleeve, wherein when 1) the insertion device is connected to the intramedullary nail, and 2) the flexible sleeve is inserted at least partially in the leg, the insertion device can advance the intramedullary nail through the flexible sleeve along the first direction to position the intramedullary nail in the medullary canal.
4. The system of claim 3, further comprising an aiming device connectable to the insertion device, the aiming device configured to guide at least one anchor toward the bone, wherein when 1) the aiming device is connected to the insertion device, and 2) the intramedullary nail is positioned in the medullary canal, the aiming device guides the at least one anchor toward the bone along a second direction that is transverse to the first direction.
5. The system of claim 4, wherein the insertion device further comprises an insertion member defining a leading end and a trailing end spaced apart from a leading end along a second axis, the insertion member defines an insertion member bore extending between the leading and trailing ends along the second axis, wherein the insertion member is configured to be at least partially disposed in the first cannulation of the flexible sleeve.
6. The system of claim 5, wherein the intramedullary nail defines a nail bore extending at least partially between the proximal and distal ends along a intramedullary nail direction, and one or more openings each configured to receive a portion of the at least one anchor, and the system further comprises a connecting rod configured to couple the insertion device to the intramedullary nail, wherein the connecting rod is configured to be at least partially disposed in the bore of the insertion member, wherein when the connecting rod is disposed at least partially in the bore of the insertion member, a portion of the connecting rod engages at least a portion of the intramedullary nail bore to connect the intramedullary nail to the insertion device.
7. The system of claim 5, wherein the proximal end of the intramedullary nail defines a notch, and the leading end of the insertion member defines a tab, wherein the tab is configured to be received by the notch so as to rotatably fix in the insertion member relative the intramedullary nail.
8. The system of claim 4, wherein the aiming device comprises an aiming member, and wherein the system further comprises a guide sleeve configured to be supported by the aiming member, wherein the guide sleeve defines a proximal end, a distal end spaced apart from an proximal end along a guide sleeve axis, and a guide sleeve cannulation extending between the proximal and distal ends along the guide sleeve axis, wherein the at least one anchor is insertable through the guide sleeve cannulation.
9. The system of claim 8, wherein the aiming member defines a first surface, a second surface spaced apart from the first surface along the second direction, and a plurality of channels extending between the first and second surfaces along the second direction, each channel configured to at least partially receive the guide sleeve therein.
10. The system of claim 9, wherein the aiming member is a frame that supports at least one extension member, the at least one extension member includes at least one of the plurality of channels, wherein when the aiming member is attached to the insertion device 1) the frame partially surrounds a portion of the leg, and 2) the at least one extension member extends along the first direction.
11. The system of claim 1, wherein the retaining member comprises an upper surface and an opposed lower surface and an aperture extending from the upper surface to the lower surface and the trailing end of the flexible sleeve is configured to releasably lock to the retaining member within the aperture of the retaining member and the trailing portion of the rigid inner sleeve is configured to releasably lock to the retaining member within the aperture of the retaining member.
12. The system of claim 11, further comprising a rotating blocking device located on the retaining member where the rotating blocking device comprises a shaft extending from the upper surface and an enlarged head connected to the shaft, where the head is rotatable to extend over the aperture of the retaining member.
13. The system of claim 11, wherein the trailing portion of the rigid inner sleeve is configured to releasably lock within the aperture at a first position and wherein the trailing end of the flexible sleeve is configured to releasably lock within the aperture at a second position that is closer to the lower surface than the first position.
14. The system of claim 11, wherein the retaining member comprises a first projection and a second projection with both the first and second projections extending into the aperture, and the trailing portion of the rigid inner sleeve comprises a first recess and a second recess, wherein the first projection is sized to fit within the first recess and the second projection sized to fit within the second recess to releasably lock the trailing portion of the rigid inner sleeve within the aperture.
15. The system of claim 14, further comprising a locking switch on the retaining member that actuates to move the first and second projections into the aperture to fit within the respective first and second recesses.
16. A system for inserting and securing, through a suprapatellar region of a leg, an intramedullary nail into a medullary canal of a bone, the system comprising:
a flexible sleeve configured to be partially inserted in the leg, the flexible sleeve including a distal end, a proximal end, an elongated shaft and a proximal portion located proximally from the elongated shaft, the flexible sleeve defining a first cannulation extending between the proximal end and the distal end, the proximal portion having a first outer cross-section dimension greater than a maximum second outer cross-section dimension of the elongated shaft, the first cannulation sized to receive therethrough at least the intramedullary nail, wherein the flexible sleeve is configured to flex so as to change a shape of the elongated shaft from a first configuration to a second configuration, wherein the second configuration is different than the first configuration;
a rigid inner sleeve comprising an elongated shaft portion having a maximum, first, outer cross-sectional dimension and a trailing portion located proximally from the elongated shaft portion having a second cross-sectional dimension greater than the maximum, first, outer cross-sectional dimension;
a retaining device comprising a handle and a retaining member that extends from the handle, the retaining member having an upper surface and a lower surface and an aperture extending from the upper to the lower surface, the retaining member comprising first means for releasably locking the proximal portion of the flexible sleeve located adjacent to the aperture and between the upper and lower surfaces and second means for releasably locking the trailing portion of the rigid inner sleeve while the elongated shaft portion is disposed within the first cannulation of the flexible sleeve located adjacent to the aperture and between the upper and lower surfaces,
wherein the proximal portion of the flexible sleeve includes third means for releasably locking with the retaining member and the trailing portion of the rigid inner sleeve includes fourth means for releasably locking with the retaining member.
17. The system of claim 16, wherein the first means is located closer to the lower surface than the second means.
18. The system of claim 17, wherein the third means comprises a first detent and a second detent where the first and second detents are radially separated from one another.
19. The system of claim 18, wherein the first means comprises a first protrusion and a second protrusion where the first and second protrusions are formed along a perimeter of the aperture.
20. The system of claim 17, wherein the fourth means comprises a first recess and a second recess located in the trailing portion of the rigid inner sleeve.
21. The system of claim 20, wherein the second means comprises a first projection and a second projection, the first projection sized to fit within the first recess and the second projection sized to fit within the second recess.
22. The system of claim 21, further comprising a locking switch mechanically connected to the first and second projections where in a first position the locking switch urges the first and second projections into the aperture and in a second position the locking switch withdrawals the first and second projections out of the aperture.
23. The system of claim 17, further comprising a rotating blocking device located on the retaining member where the rotating blocking device comprises a shaft extending from the upper surface and an enlarged head connected to the shaft, where the head is rotatable to extend over the aperture of the retaining member.
24. A system for inserting and securing, through a suprapatellar region of a leg, an intramedullary nail into a medullary canal of a bone, the system comprising:
a flexible sleeve configured to be partially inserted in the leg, the flexible sleeve defining a leading end and a trailing end spaced apart from the leading end along a first axis, the flexible sleeve defining a first cannulation extending along the first axis between the leading and trailing ends, the first cannulation sized to receive therethrough at least the intramedullary nail, wherein the flexible sleeve is configured to flex so as to change a shape of the first axis from a first configuration to a second configuration, wherein the second configuration is different than the first configuration;
a rigid inner sleeve comprising a distal end, a trailing portion and an elongated shaft portion located between the distal end and the trailing portion;
a retaining device comprising a handle and a retaining member that extends from the handle, the retaining member configured to releasably lock to the trailing end of the flexible sleeve and further configured to releasably lock to the trailing portion of the rigid inner sleeve while the elongated shaft portion is disposed within the first cannulation of the flexible sleeve, wherein the retaining member is configured to position the flexible sleeve through the suprapatellar region of the leg such that the flexible sleeve leading end is aligned with a proximal end of the bone; and
an intramedullary nail insertable through the flexible sleeve and into the medullary canal, wherein the intramedullary nail defines a proximal end and a distal end, and at least one curved portion that is disposed at least between the proximal and distal ends of the intramedullary nail, and the flexible sleeve is configured to flex as the nail is inserted from the trailing end to the leading end, wherein:
the retaining member comprises an upper surface and an opposed lower surface and an aperture extending from the upper surface to the lower surface where the aperture defines a center axis extending from the upper surface to the lower surface along a first direction;
the system further comprises an insertion device configured for removable connection to the intramedullary nail;
the intramedullary nail and at least a portion of the insertion device is configured to be received within the first cannulation of the flexible sleeve; and
when 1) the insertion device is connected to the intramedullary nail, and 2) the flexible sleeve is inserted at least partially in the leg, the insertion device can advance the intramedullary nail through the flexible sleeve along the first direction to position the intramedullary nail in the medullary canal.
25. The system of claim 24, further comprising an aiming device connectable to the insertion device, the aiming device configured to guide at least one anchor toward the bone, wherein when 1) the aiming device is connected to the insertion device, and 2) the intramedullary nail is positioned in the medullary canal, the aiming device guides the at least one anchor toward the bone along a second direction that is transverse to the first direction.
26. The system of claim 25, wherein the insertion device further comprises an insertion member defining a leading end and a trailing end spaced apart from a leading end along a second axis, the insertion member defines an insertion member bore extending between the leading and trailing ends along the second axis, wherein the insertion member is configured to be at least partially disposed in the first cannulation of the flexible sleeve.
27. The system of claim 26, wherein the intramedullary nail defines a nail bore extending at least partially between the proximal and distal ends along a intramedullary nail direction, and one or more openings each configured to receive a portion of the at least one anchor, and the system further comprises a connecting rod configured to couple the insertion device to the intramedullary nail, wherein the connecting rod is configured to be at least partially disposed in the bore of the insertion member, wherein when the connecting rod is disposed at least partially in the bore of the insertion member, a portion of the connecting rod engages at least a portion of the intramedullary nail bore to connect the intramedullary nail to the insertion device.
28. The system of claim 26, wherein the proximal end of the intramedullary nail defines a notch, and the leading end of the insertion member defines a tab, wherein the tab is configured to be received by the notch so as to rotatably fix in the insertion member relative the intramedullary nail.
29. The system of claim 25, wherein the aiming device comprises an aiming member, and wherein the system further comprises a guide sleeve configured to be supported by the aiming member, wherein the guide sleeve defines a proximal end, a distal end spaced apart from an proximal end along a guide sleeve axis, and a guide sleeve cannulation extending between the proximal and distal ends along the guide sleeve axis, wherein the at least one anchor is insertable through the guide sleeve cannulation.
30. The system of claim 29, wherein the aiming member defines a first surface, a second surface spaced apart from the first surface along the second direction, and a plurality of channels extending between the first and second surfaces along the second direction, each channel configured to at least partially receive the guide sleeve therein.
31. The system of claim 30, wherein the aiming member is a frame that supports at least one extension member, the at least one extension member includes at least one of the plurality of channels, wherein when the aiming member is attached to the insertion device 1) the frame partially surrounds a portion of the leg, and 2) the at least one extension member extends along the first direction.
32. A system for inserting and securing, through a suprapatellar region of a leg, an intramedullary nail into a medullary canal of a bone, the system comprising:
a flexible sleeve configured to be partially inserted in the leg, the flexible sleeve defining a leading end and a trailing end spaced apart from the leading end along a first axis, the flexible sleeve defining a first cannulation extending along the first axis between the leading and trailing ends, the first cannulation sized to receive therethrough at least the intramedullary nail, wherein the flexible sleeve is configured to flex so as to change a shape of the first axis from a first configuration to a second configuration, wherein the second configuration is different than the first configuration;
a rigid inner sleeve comprising a distal end, a trailing portion and an elongated shaft portion located between the distal end and the trailing portion;
a retaining device comprising a handle and a retaining member that extends from the handle, the retaining member configured to releasably lock to the trailing end of the flexible sleeve and further configured to releasably lock to the trailing portion of the rigid inner sleeve while the elongated shaft portion is disposed within the first cannulation of the flexible sleeve, wherein the retaining member is configured to position the flexible sleeve through the suprapatellar region of the leg such that the flexible sleeve leading end is aligned with a proximal end of the bone, wherein:
the intramedullary nail is insertable through the flexible sleeve and into the medullary canal;
the retaining member comprises an upper surface and an opposed lower surface and an aperture extending from the upper surface to the lower surface, and the trailing end of the flexible sleeve is configured to releasably lock to the retaining member within the aperture of the retaining member and the trailing portion of the rigid inner sleeve is configured to releasably lock to the retaining member within the aperture of the retaining member; and
the system further comprises a rotating blocking device located on the retaining member where the rotating blocking device comprises a shaft extending from the upper surface and an enlarged head connected to the shaft, where the head is rotatable to extend over the aperture of the retaining member.
33. A system for inserting and securing, through a suprapatellar region of a leg, an intramedullary nail into a medullary canal of a bone, the system comprising:
a flexible sleeve configured to be partially inserted in the leg, the flexible sleeve defining a leading end and a trailing end spaced apart from the leading end along a first axis, the flexible sleeve defining a first cannulation extending along the first axis between the leading and trailing ends, the first cannulation sized to receive therethrough at least the intramedullary nail, wherein the flexible sleeve is configured to flex so as to change a shape of the first axis from a first configuration to a second configuration, wherein the second configuration is different than the first configuration;
a rigid inner sleeve comprising a distal end, a trailing portion and an elongated shaft portion located between the distal end and the trailing portion;
a retaining device comprising a handle and a retaining member that extends from the handle, the retaining member configured to releasably lock to the trailing end of the flexible sleeve and further configured to releasably lock to the trailing portion of the rigid inner sleeve while the elongated shaft portion is disposed within the first cannulation of the flexible sleeve, wherein the retaining member is configured to position the flexible sleeve through the suprapatellar region of the leg such that the flexible sleeve leading end is aligned with a proximal end of the bone, wherein:
the intramedullary nail is insertable through the flexible sleeve and into the medullary canal;
the retaining member comprises an upper surface and an opposed lower surface and an aperture extending from the upper surface to the lower surface and the trailing end of the flexible sleeve is configured to releasably lock to the retaining member within the aperture of the retaining member and the trailing portion of the rigid inner sleeve is configured to releasably lock to the retaining member within the aperture of the retaining member; and
the trailing portion of the rigid inner sleeve is configured to releasably lock within the aperture at a first position and the trailing end of the flexible sleeve is configured to releasably lock within the aperture at a second position that is closer to the lower surface than the first position.
34. A system for inserting and securing, through a suprapatellar region of a leg, an intramedullary nail into a medullary canal of a bone, the system comprising:
a flexible sleeve configured to be partially inserted in the leg, the flexible sleeve defining a leading end and a trailing end spaced apart from the leading end along a first axis, the flexible sleeve defining a first cannulation extending along the first axis between the leading and trailing ends, the first cannulation sized to receive therethrough at least the intramedullary nail, wherein the flexible sleeve is configured to flex so as to change a shape of the first axis from a first configuration to a second configuration, wherein the second configuration is different than the first configuration;
a rigid inner sleeve comprising a distal end, a trailing portion and an elongated shaft portion located between the distal end and the trailing portion;
a retaining device comprising a handle and a retaining member that extends from the handle, the retaining member configured to releasably lock to the trailing end of the flexible sleeve and further configured to releasably lock to the trailing portion of the rigid inner sleeve while the elongated shaft portion is disposed within the first cannulation of the flexible sleeve, wherein the retaining member is configured to position the flexible sleeve through the suprapatellar region of the leg such that the flexible sleeve leading end is aligned with a proximal end of the bone, wherein:
the intramedullary nail is insertable through the flexible sleeve and into the medullary canal;
the retaining member comprises an upper surface and an opposed lower surface and an aperture extending from the upper surface to the lower surface and the trailing end of the flexible sleeve is configured to releasably lock to the retaining member within the aperture of the retaining member and the trailing portion of the rigid inner sleeve is configured to releasably lock to the retaining member within the aperture of the retaining member; and
the retaining member comprises a first projection and a second projection with both the first and second projections extending into the aperture, and the trailing portion of the rigid inner sleeve comprises a first recess and a second recess, wherein the first projection is sized to fit within the first recess and the second projection sized to fit within the second recess to releasably lock the trailing portion of the rigid inner sleeve within the aperture.
35. The system of claim 34, further comprising a locking switch on the retaining member that actuates to move the first and second projections into the aperture to fit within the respective first and second recesses.