a handle cover for delivery catheter typically includes a handle body region configured to cover a portion of the delivery catheter such as the proximal handle portion of the delivery catheter , and a control adapter that is configured to engage an implant release portion of the delivery catheter . a handle cover may be reusable or single - use , and may be constructed so that it can encase or sheath the proximal end of the delivery catheter while enhancing the function of the delivery catheter . for example , the handle cover may be formed of two or more interlocking parts that secure over the delivery catheter handle . for example , in one embodiment , a handle cover for an implant delivery catheter includes a handle cover body configured to cover and engage with a proximal portion of a delivery catheter . the handle cover also includes a control adaptor . a control adapter may be a knob , switch , slider , dial , button , etc . that can be manipulated by a user holding the handle to release an implant into a target region of a patient &# 39 ; s heart . the control adaptor typically activates an implant release control that is located on the proximal portion of the implant delivery catheter , enabling the release of the implant from the distal portion of the deliver catheter . a handle cover may be part of an implant deliver system that includes a delivery catheter , handle cover , and ( optionally ) an implant configured to be releasably secured at a distal portion of the delivery catheter . the delivery catheter typically includes an implant release control located at the proximal end of the delivery catheter that can be activated to release ( or in some variations , engage ) an implant by the distal end region of the delivery catheter . when the handle cover is secured to the delivery catheter , the implant release control may be activated by the control adaptor . the control adapter of the handle cover may also regulate the operation of the implant release control . for example , the control adapter may include a limiter that limits the rate and / or amount that the implant release control is activated . in some variations , the control adapter is lockable , to prevent release of an implant from the delivery catheter by activation of the implant release control until it is unlocked . in some variations , the handle cover includes an indicator of the activation state of the implant release control . an indicator may be visible ( e . g ., by a marking , text , color change , etc .) showing the amount of activation or release of an implant by the delivery catheter . in operation , a handle cover may be used with a delivery catheter to control the deployment of an implant from the delivery catheter . for example , a distal portion of an implant delivery catheter may be advanced near a target region of the patient &# 39 ; s heart , such as with the patient &# 39 ; s ventricle . an expandable implant may be attached to the distal end of the implant delivery catheter in a collapsed configuration . in variations of the handle cover including a lockable control adapter , the control adapter of the handle cover may then be unlocked . the control adapter can then be manipulated ( e . g ., by rotation ) to activate the implant release control . the activation of the implant release control causes release of the expandable implant . accordingly , the expandable implant may be released into the target region of the patient &# 39 ; s heart . releasing the expandable implant may involve partitioning the left ventricle of the subject &# 39 ; s heart into productive and non - productive regions . in some variations , the activation of the implant release control includes releasing an expandable implant by rotating a threaded region or coil at the distal end of the delivery catheter until the coil disengages from an implant . for example , an implant may have a threaded receiving region that engages the release mechanism on the distal end of the delivery catheter . an appropriate implant may be used with the delivery catheter and / or handle covers described herein . for example , refer to the implants described in the patent applications incorporated by reference above . in particular , expandable implants having a plurality of ribs to help secure the implant within the target region of the patient &# 39 ; s heart ( e . g ., ventricle ) are of particular interest . partition implants , which may include one or more membranes for partitioning a region of the heart , are also of interest . fig1 - 7 illustrate variations of handle cover and systems including handle covers . for example , fig1 illustrates an implant delivery system for improving cardiac function . the implant delivery system 100 includes a delivery catheter 102 , an implant release 104 , a handle cover 106 , an implant loader 114 and inflation port 112 . the implant delivery system 100 shown in fig1 includes an implant release 104 at a distal portion of the delivery catheter . the implant release 104 may be activated by an implant release control , as describe in greater detail below ( e . g ., see fig7 ). the implant release 104 may be connected to the implant release control of the delivery catheter ( not visible in fig1 ) by a wire ( e . g ., guidewire ) or another mechanism . the implant release 104 mechanism typically releases an implant . in addition , the delivery catheter may also be used to deliver material such as coils and / or a bioabsorbable materials within or behind the implant after it is positioned . for example , the delivery catheter may include a channel or passage for delivery of material through , behind or into the implant . for example , the delivery catheter may allow delivery of a bioabsorbable material such as collagen , gelatin , polylactic acid , polyglycolic acid , copolymers of polylactic acid and polyglycolic acid , polycaprolactone , mixtures and copolymers , or the like . in some variations this material may be delivered behind the device after it has been implanted . in some variations , the implant release control ( not visible in fig1 ) rotates the implant release mechanism 104 , enabling the implant release 104 to release an implant such as those depicted in u . s . patent application publication no . 2006 / 0281965 and u . s . patent application publication no . 2006 / 0264980 , which are herein incorporated by reference in their entirety . an implant delivery system 100 may also include an implant loader 114 . an implant loader 114 can collapse an implant . the implant loader may also engage with the delivery catheter 102 particularly when the implant loader is not in use ( e . g ., before or after collapsing the implant and loading to the delivery catheter ). the implant loader 114 may have a funnel or cone shape , as illustrated in the variation shown in fig1 . as mentioned above , any appropriate delivery catheter for delivering a collapsible implant may be used . for example , the delivery catheter 102 may take the form described in u . s . patent application publication no . 2006 / 0281965 or u . s . patent application publication no . 2006 / 0264980 . as describe in fig7 , a delivery catheter 102 may include two tubular members , attaching to an inflation port 112 and a coil delivery port 706 . as shown in fig7 , the inflation port 112 and the coil delivery port 706 are located at a proximal portion of the delivery catheter . the inflation port 112 may be configured to inflate a balloon to help secure the implant within the target region of the patient &# 39 ; s heart . the coil delivery port 706 may be used to release the implant and to rotate a coil at the distal end of the delivery catheter until the coil disengages from the implant . optionally , the coil delivery port may be replaced by another type of delivery port . as mentioned above , and illustrated in fig1 , a handle cover 106 may include a handle body 108 and a control adaptor 110 . the handle body 108 in this example is formed of two interlocking pieces . alternatively , the handle body 108 may be one complete piece or more than two interlocking pieces . the handle body 108 may be made of plastic , glass or other materials . as depicted in fig7 , the handle body 108 in this example forms an opening or passageway 702 generally configured to hold the proximal portion of the delivery catheter 102 . this opening or passageway 702 is formed of an elongate section 708 , a projecting section 710 and a base 712 . the elongate section 708 of the passageway 702 encases the proximal portion of the delivery catheter 102 . the projecting section 710 is configured to hold the portion of the delivery catheter 102 that is attached to a coil delivery port . the projecting section 710 also serves as a gripping mechanism for the implant delivery system 100 . the handle body 108 may also include gripping tabs , detents , attachment and projections to secure and / or engage portions of the delivery catheter 102 throughout the elongate section 708 , the projecting section 710 and the base 712 . thus , the delivery catheter may be secured within the handle cover so that it doesn &# 39 ; t rotate or slide with respect to the handle cover . as illustrated in fig1 - 3 , a control adaptor 110 may be attached to the handle body 108 and is configured to engage the implant release control of the delivery catheter 102 . in this example , the control adaptor 110 forms a knob that can be rotated to control the deployment . optionally , the control adaptor 110 may be a pumping , electrical , or other control mechanism to engage the implant release control of the delivery catheter 102 . a user may operate the control adaptor 110 to activate the release of an implant from the delivery catheter . activating the control adapter typically activates the implant release control ( 714 in fig7 ). fig2 shows a side perspective view of a handle cover including a control adapter 110 at the proximal end . fig3 shows a partial view of the handle body region of the handle cover shown in fig2 . the base 712 of the handle body 108 is shown separated from the control adaptor 110 . the base 712 includes a track 302 , a slot 304 and a ratchet 306 . fig4 illustrates a control adaptor 110 including a tab 402 . the control adaptor 110 shown in fig4 is configured to rotate in a counter clockwise direction ( and also in part in a clockwise direction ). the control adaptor 110 is also configured to be locked and unlocked . activation of the control adapter 110 causes the implant release control to activate the implant release , thereby enabling an implant to release from a distal end of the delivery catheter . the control adaptor 110 can be locked to prevent activation of the implant release control when manipulating the control adaptor 110 . when the control adapter 110 is locked , e . g ., when the tab 402 on the control adaptor 110 is locked into the slot 304 on the handle body 108 in the example shown in fig2 - 4 , the control adapter may be rotated but will not engage the implant release control and release the implant . this locking mechanism may prevent the control adaptor 110 from rotating , or may simply decouple rotation of the control adapter from the implant release control . as shown in fig5 , the control adaptor 110 may be held in the locked position by the annular snap feature 500 on the control adaptor 110 and the handle body 108 . in fig5 , the control adaptor 110 can be unlocked by a distal pull ; in some configurations the control adapter is unlocked by pushing distally , or by some combination of pushing / pulling and rotating . when the control adaptor 110 is put into the unlocked position , the annular snap feature 500 on the control adaptor 110 and the handle body 108 may hold the control adaptor 110 in the unlocked position . accordingly , the tab 402 can slide counterclockwise through the track 402 on the handle body 108 . as the control adaptor 110 is moved from the locked to the unlocked position , the ratchet 306 on the handle body 108 interferes with tab 402 so that the control adaptor 110 cannot be rotated in the clockwise direction . one side of the slot 304 is formed by the ratchet 306 on the handle body 108 . the ratchet 306 on the handle body 108 allows the tab 402 on the handle body 108 to pass in the counterclockwise direction , but not in the clockwise direction . after each full turn in the counterclockwise direction , the tab 402 snaps past the ratchet 306 and the control adaptor 110 is unable to make any subsequent turns in the clockwise direction . the control adaptor 110 may also provide feedback upon rotation or activation of the implant release control 104 . feedback may indicate that the control adapter is engaged ( or locked ), and may indicate the status of the control adapter / implant release control . for example , in some variations , the deployment of the implant may involve the removal of a threaded attachment member / deployment member . a feedback on the handle may indicate how far into the deployment ( e . g ., how unscrewed ) the implant is . for example the handle cover may indicate by audible ‘ clicks ’ how many turns of the deployment mechanism have been completed . the feedback may be visual , aural , tactile , or the like . for example , the control adaptor 110 may provide clicking sounds to the operator of the implant delivery system 100 . fig6 illustrates an implant loader detent 600 on a distal end of the handle body 108 . each interlocking piece of the handle body 108 includes the implant loader detent 600 to secure the implant loader 114 . when the implant delivery system 100 is not in use , the implant loader 114 is in the distal section of the handle body 108 . fig8 a and 8b show the distal end of an implant delivery catheter including a distal tip guard . in this variation , the distal tip guard may also be referred to as a screw guard , because the distal end of the delivery catheter has an implant release that includes a threaded region ( shown as a coil or screw ) projecting from the distal end , to which the implant may be releasably engaged . this screw region may be secured at or near the distal end of the implant delivery catheter along with an inflatable ( balloon ) region that also forms a portion of the implant release . distal to the implant release is a screw guard , as illustrated in fig8 a and 8b . in general , the distal tip guard is a cap , protrusion or projection from the distal end of the device that prevents the implant release portion at the distal end of the implant delivery catheter from damaging the heart wall . in fig8 a and 8b the distal tip guard is a screw guard that projects distally from the screw region of the implant release portion , and is a soft material ( e . g ., a material having a low durometer , such as low durometer pebax , etc .). the screw guard may be connected to the distal end of the device in any appropriate manner , including adhesively , ( e . g ., via an adhesive joint ), by crimping , sealing , welding , or the like . the distal end of the screw guard may be blunted or otherwise atraumatic . to the extent not otherwise described herein , the various components of the implants , applicators / delivery catheters , and handle covers may be formed of conventional materials and in a conventional manner as will be appreciated by those skilled in the art . while particular forms of the invention have been illustrated and described herein , it will be apparent that various modifications and improvements can be made to the invention . moreover , individual features of embodiments of the invention may be shown in some drawings and not in others , but those skilled in the art will recognize that individual features of one embodiment of the invention can be combined with any or all the features of another embodiment . accordingly , it is not intended that the invention be limited to the specific embodiments illustrated . it is intended that this invention to be defined by the scope of the appended claims as broadly as the prior art will permit .
described herein are handle covers for use with one or more delivery catheters that may be used to deliver and / or remove an expandable cardiac implant . a handle cover may be formed from two interlocking pieces , and may include a control adapter that may be used to control release and / or attachment of an expandable implant . the control adapter may be configured to interact with an implant release control on the delivery catheter . the control adapter may also be lockable to prevent unintended activation of the implant release control . the handle cover may be reusable or disposable . in general , the implant control may be shaped so that hit may be held by a doctor , technician or other user , and may facilitate access to various components of the delivery catheter , including one or more ports .