the invention generally relates to the treatment of prostate cancer by using a stepper - stabilizer to image the patient prior to and while inserting radioactive seeds for dose treatment . fig1 illustrates a top view of a cradle 1 attached to a stepper 5 . the cradle 1 includes a probe - holder 40 and a cradle base 13 supporting the probe - holder 40 . the stepper 5 is a piece of hardware that is used to connect to a stabilizer generally indicated at the numeral 30 . this overview illustrates the correlation of the cradle 1 to the stepper 5 . further , attached to the stepper 5 is a needle guide template 9 . the needle guide template 9 is used to provide the location of brachytherapy needle strands inserted into the human body while being imaged on the patient , as by a best nomos ® sonalis ™ system , for example . the needle guide template 9 is fixed on the system by way of a template locking knob 2 . the template locking knob 2 allows a medical assistant to fix the needle guide template 9 , thus allowing calibration between the needle guide template 9 and an ultrasound image provided by the ultrasound probe . it is important that the ultrasound probe be precisely aligned with the needle guide template 9 guide as illustrated on an imaging device ( not shown ). however , there can still be problems in the prior art with alignment because of the misalignment of cradles and probes . this can result in placing a radioactive seed in the wrong location , or not as directed by the treatment plan . as shown in fig1 , the stepper 5 has a baseline marker 3 . the baseline marker 3 measures the depth of the probe during insertion into the human body . this allows medical personnel to insert the probe to a specific depth in the human body to image a front , middle , or back part of the prostate , for example . the baseline marker 3 can be adjusted using a fine - tuning knob 4 , which allows medical personnel to calibrate the stepper distance prior to inserting the probe into the human body . the stepper 5 can be secured to a stabilizer by way of tightening knobs on the base of the stepper 5 . a stepper knob 6 is used to move forward and backwards the stepper 5 , the cradle 1 , and an ultrasound probe secured in the cradle 1 . wing nuts 7 securely latch the stepper 5 to rods on which a needle guide template support is located . also , the wing nuts 7 can be loosened so that mounting screws can slide onto a mounting bracket of the stabilizer , generally indicted at the numeral 30 in fig1 . the needle guide template support is secured to the rods by knurled knobs , of which only one , a left - side knob 8 , is shown in fig1 . grommets on the needle guide support receive posts on the needle guide template 9 . although major adjustments of the system and component alignment are afforded , prior art devices do not allow fully for precise calibration of an ultrasound probe supported in a prior art cradle . however , the cradle 1 of the present invention is designed to allow for micro - adjustments . further , the stepper 5 and the needle guide template 9 support and allow for horizontal and vertical needle path adjustments by changing the needle guide template 9 location to match an on - screen grid projected over an image generated by an ultrasound probe . when such horizontal and vertical adjustments are made , there may remain alignment artifacts in the screen display . such alignment artifacts may result from manufacturing factors inherent to the ultrasound probe , for example . system and component alignment , and removal of alignment artifacts , may be accomplished using the micro - adjustment aspects included on the cradle 1 of the present invention . fig2 illustrates a top view of the cradle 1 . the cradle 1 includes a locking knob 10 . the locking knob 10 secures a latch 11 , which can be fixed over an ultrasound probe to be secured in the cradle 1 . the latch 11 is pivot - mounted on a right side or pivot side rail 22 . as discussed further below , the latch 11 allows for the probe to be fixed securely , whereas prior cradles had problems with ultrasound probes sliding out , or otherwise becoming loose . also shown in fig2 , is a micro - adjuster 20 , including micro - adjuster bearings 20 a , discussed further below . the cradle 1 may be attached to the stepper 5 by screws secured via cradle - fix holes 21 formed through the cradle base 13 . fig3 illustrates a left - side view of the cradle 1 , shown in elevation . the locking knob 10 is fixed against loss with a capture knob 12 . the capture knob 12 is assembled to a left side rail 23 of the cradle 1 , typically using a high - strength adhesive , while keeping locking knob 10 free to turn . referring further to fig2 , 4 and 6 , shown are the probe - holder 40 including a front yoke 14 , a yoke retainer 24 and a rear yoke 17 . the front yoke 14 and the rear yoke 17 are connected rigidly by the right side rail 22 and the left side or lock side rail 23 . the front yoke 14 is assembled to the micro - adjuster 20 , including the micro - adjuster bearings 20 a , to form a front yoke assembly 32 , described further below . the front yoke assembly 32 , including the yoke retainer 24 and the front yoke 17 , and the rear yoke 17 are rotatably supported on various rollers 18 , such as a plurality of roller - bearings 18 a , for rotation of the probe - holder 40 with respect to the cradle base 13 . the yoke retainer 24 and the rear yoke 17 of the probe - holder 40 can rotate relative to the cradle base 13 in a first range of angular rotation for a maximum of 180 degrees (+/− 90 degrees ) by the rollers 18 associated with the cradle base 13 , such as the plurality of roller - bearings 18 a . the micro - adjuster 20 , including the micro - adjuster bearings 20 a allow for rotational movement of the front yoke 14 and the rear yoke 17 , affording refined adjustments of the cradle 1 for a further adjustment through approximately 15 ° ( 7 . 5 °+/−), in a second range of angular rotation of the front yoke 14 and the rear yoke 17 of the probe - holder 40 relative to the cradle base 13 , the second range of angular rotation being less than the first range of angular rotation . as explained in further detail below , the micro - adjuster 20 , including the micro - adjuster bearings 20 a is used for the second adjustment to further calibrate the cradle 1 , after the probe - holder 40 has been precision - located by detent in a 90 - degree perpendicular plane for a first adjustment to calibrate the cradle 1 for a medical procedure , to account for any remaining misalignments when correlating with images from ultrasound probes secured in the cradle 1 . the micro - adjuster 20 , including the micro - adjuster bearings 20 a , allow medical personnel to change a beam plane alignment slightly to correct calibration errors , to provide a second adjustment to further calibrate the cradle 1 , after the first adjustment , for a medical procedure . specifically , some ultrasound probes are potted incorrectly during manufacture with crystal misalignment . therefore , the micro - adjuster 20 , including the micro - adjuster bearings 20 a , allow for correction of manufacturing defects by moving the ultrasound probe , secured within the cradle 1 , independent of a precise , 90 - degree alignment obtained from a center detent , as discussed herein . referring to fig4 and 6 , fig4 illustrates a front - view and fig6 illustrates a rear view of the cradle 1 . the probe - holder 40 of the cradle 1 includes a probe space 15 , for receiving a probe , and includes the front yoke 14 and the rear yoke 17 and the yoke retainer 24 that supports the front yoke 14 . the probe - holder 40 can also include the latch 11 , the locking knob 10 and the capture knob 12 , as well as can include the pivot side rail 22 and the lock side rail 23 . the latch 11 can open and close over a given ultrasound probe when the probe is positioned in the probe space 15 of the probe holder 40 of the cradle 1 . the selected ultrasound probe may be placed into the probe space 15 of the probe - holder 40 and enclosed by the latch 11 . the latch 11 has a probe - lock - fixer 16 , such as a pressure pad 16 a , that is attached to the latch 11 . the probe - lock - fixer 16 is used to hold the probe in place when the probe is positioned in the probe space 15 of the cradle 1 . while prior art cradles would hold the probe , however , during medical procedures , the probes would be known rotate a few degrees , which affects the imaging quality and device alignment during the procedure . therefore , the probe - lock - fixer 16 is designed to hold the probe in a fixed position , without causing rotational plane movement . advantageously , the probe - lock - fixer , such as the pressure pad 16 a , has an eccentric , concave profile , such as illustrated in fig4 and 6 . such profile of probe - lock - fixer 16 , such as of the pressure pad 16 a , affords a mechanical advantage in securing the chosen ultrasound probe in the probe space 15 of the probe holder 40 of the cradle 1 . the cradle base 13 supports and houses a series of the rollers 18 , such as the plurality of roller - bearings 18 a . the rollers 18 allow for a smooth , rotational movement of the probe when held in a fixed position in the probe space 15 of the probe - holder 40 of the cradle 1 . fig5 is a top view of the cradle 1 with the latch 11 open to show the probe space 15 . the selected ultrasound probe is placed into the probe space 15 and closed over by the latch 11 . the latch 11 has a cone - shaped cavity 25 that accepts the correspondingly cone - shaped locking knob 10 . the locking knob 10 cooperates with the cone - shaped cavity 25 , which allows for self - tensioning of the latch 11 that holds the ultrasound probe securely in place . fig6 illustrates a right - side rear view of the exemplary cradle 1 with the latch 11 in a closed position . the probe - lock - fixer 16 , such as the pressure pad 16 a , is designed in a concave , eccentric fashion , as noted above . such design of the probe - lock - fixer 16 allows for maximizing a surface area of the probe - lock - fixer 16 to contact the probe , when the probe is held in the probe space 15 by the probe - lock - fixer 16 being positioned against the ultrasound probe , to restrict angular movement of the probe when the ultrasound probe is positioned in the probe space 15 . fig7 illustrates a bottom - view of the cradle 1 . as the yoke retainer 24 and the rear yoke 17 rotate on the rollers 18 , such as on the roller - bearings 18 a , and move from one side to another side , the probe holder 40 cradle base 13 slides over a locker , such as a detent , 19 associated with the cradle base 13 . as illustrated in fig4 and 7 , the locker , such as the detent , 19 cooperates with a spring - loaded ball bearing 19 a supported on the cradle base 13 , and is used to orient repeatably and precisely the yoke retainer 24 with respect to the cradle base 13 , such as in a 90 - degree position , for the first adjustment to position the probe - holder 40 at a predetermined position at a predetermined angle relative to the cradle base 13 by the probe - holder 40 engaging the locker , such as the detent , 19 . as illustrated in fig3 - 6 , the rollers 18 , such as including the plurality of roller - bearings 18 a , rotatably support the probe - holder 40 on the cradle base 13 and are configured to enable the angular rotation in the first range of angular rotation , the first range of angular rotation being indicated by the dashed arrowed lines a , for the first adjustment to calibrate the cradle 1 for a medical procedure . as illustrated , the rollers 18 , such as including the plurality of roller - bearings 18 a , are associated with the cradle base 13 , the yoke retainer 24 and the rear yoke 17 . also , the cradle base 13 and the probe - holder 40 are configured to enable the yoke retainer 24 and the rear yoke 17 to rotate in the first range of angular rotation to adjust a position of the probe - holder 40 for a medical procedure . however , there may be misalignment issues , despite the locker , such as the detent , 19 . thus , the micro - adjuster 20 , including the micro - adjuster bearings 20 a , allow for medical personnel to readjust the orientation of the front yoke 14 and the rear yoke 17 for the second adjustment , the second adjustment being after of the first adjustment . as also illustrated in fig3 - 6 , the micro - adjuster 20 is associated with the yoke retainer 24 and rotatably associated with the front yoke 14 , and the micro - adjuster 20 includes a release member 26 , such as a screw or release button 26 a , configured to releasably secure the front yoke 14 to the yoke retainer 24 to enable an angular rotation of the front yoke 14 and the rear yoke 17 in the second range of angular rotation relative to the cradle base 13 . the micro - adjuster 20 is configured to enable the angular rotation of the front yoke 14 and the rear yoke 17 of the probe - holder 40 relative to the cradle base 13 in the second range of angular rotation , after the first adjustment , the angular rotation in the second range of angular rotation being indicated by the dashed arrowed lines b , the second range of angular rotation being less than the first range of angular rotation , by selective operation of the release member 26 to provide the second adjustment to further calibrate the cradle 1 for the medical procedure . the release member 26 , such as including the screw or release button 26 a , is configured for selective operation to enable the angular rotation for the second adjustment . the micro - adjuster 20 , including the micro - adjuster bearings 20 a , is associated with the yoke retainer 24 and in communication with the front yoke 14 and enables rotation of the front yoke 14 and the rear yoke 17 relative to the yoke retainer 24 when the yoke retainer 24 is positioned at the predetermined position at the predetermined angle , to selectively provide the second adjustment to further calibrate the cradle 1 , the front yoke 14 being communicatively connected to the rear yoke 17 , such as by association with the pivot side rail 22 and the lock side rail 23 . hence , an ultrasound probe can be held in the probe space 15 , such as with respect to perpendicular locker detent 19 , to an exact 90 degrees . importantly , such second adjustment using the micro - adjuster 20 will allow medical personnel to expedite verification of needle grid alignment .
a cradle for holding an ultrasound probe includes a base for securing to a stepper - stabilizer , roller - bearings supported on the base , and a probe - holder that rotates on the roller - bearings about a horizontal axis relative to the base . the probe - holder includes a front yoke and a rear yoke , with a yoke retainer supporting the front yoke . a pivot side rail and a lock side rail span rigidly between the front yoke and the rear yoke . a locking knob is captured to the lock side rail to prevent the locking knob from detaching . a latch hinged to the pivot side rail is engaged by the locking knob for securement over the probe . a detent ensures 90 - degree alignment of the yoke retainer to the base . the rollers rotatably support the yoke retainer and the rear yoke , and further rotation of the front yoke enables a further adjustment to calibrate the cradle .