the following detailed description is merely exemplary in nature and is not intended to limit the described embodiments or the application and uses of the described embodiments . as used herein , the word “ exemplary ” or “ illustrative ” means “ serving as an example , instance , or illustration .” any implementation described herein as “ exemplary ” or “ illustrative ” is not necessarily to be construed as preferred or advantageous over other implementations . all of the implementations described below are exemplary implementations provided to enable persons skilled in the art to make or use the embodiments of the disclosure and are not intended to limit the scope of the disclosure , which is defined by the claims . for purposes of description herein , the terms “ upper ”, “ lower ”, “ left ”, “ rear ”, “ right ”, “ front ”, “ vertical ”, “ horizontal ”, and derivatives thereof shall relate to the invention as oriented in fig1 . furthermore , there is no intention to be bound by any expressed or implied theory presented in the preceding technical field , background , brief summary or the following detailed description . it is also to be understood that the specific devices and processes illustrated in the attached drawings , and described in the following specification , are simply exemplary embodiments of the inventive concepts defined in the appended claims . hence , specific dimensions and other physical characteristics relating to the embodiments disclosed herein are not to be considered as limiting , unless the claims expressly state otherwise . with respect to fig1 an isometric view of an exemplary strengthening device or sleeve 100 for an instrument shaft is illustrated . the strengthening device 100 generally includes an attachment mechanism 105 used to attach the device to a medical instrument or device ( not shown ). as will be described in greater detail hereinafter , the strengthening device 100 includes an upper tube 110 and a lower tube 115 which may enclose one or two elongated spring 130 , depending on the desired usage . in the embodiment illustrated in fig1 , only the lower tube 115 is illustrated as containing an elongated spring 130 . the upper and lower tubes 110 , 115 are collapsible tubes or conduits which permit their shortening in total length when compressed . in an embodiment , the tubes 110 , 115 are telescoping in nature . they may also be composed of more than two tubes , permitting considerable shortening in length . as further illustrated in fig1 , the device 100 also includes a locking assembly 120 that connects the upper and lower tubes 110 , 115 to one another , and which permits adjusting of the length of elongated spring ( s ) within the tubes , respectively . a swivel ball joint assembly 145 located at the distal end of the lower tube 115 permits pivoting and provides a flexible means of obtaining a desirable entry angle to the surgeon . attached to the swivel ball joint assembly 145 is a foot 135 which , during use , is placed on the patient near the percutaneous area to restrain the device 100 from sliding inside the patient , as discussed in detail hereinafter . as will be readily appreciated , therefore , the ball joint 145 permits pivoting movement of the foot 135 relative to the lower tube 115 so that device 100 may be stabilized in any orientation . adjacent to the periphery of the foot 135 are generally equally spaced suture holes 140 are that may be used to physically attach the foot 135 to the patient . in an embodiment , the foot 135 may also , or alternatively , be provided with an adhesive material on its bottom side , allowing the foot 135 to be adhered to a patient &# 39 ; s skin . turning now to fig2 - 5 , the strengthening device 100 is shown fully attached to a medical instrument ( e . g ., a laparoscopic tool ) having a handle assembly 220 attached to an elongate shaft 205 . in particular , as shown therein , attachment mechanism 105 of the device 100 is used to attach the instrument handle assembly 220 to the strengthening device 100 . pivot point 210 of the handle assembly is used to move a proximal end of the instrument shaft 205 . two instrument handle finger inserts 216 are used to manually control the movement of handle assembly 220 . an instrument shaft locking knob 215 permits the instrument shaft 205 to be securely held . the upper tube 110 and lower tube are attached and held in place by the locking assembly 120 . by adjusting the locking knob 215 compression on the tube assembly is adjusted . as shown therein , when attached the strengthening device 100 , the instrument shaft 205 extends through the upper and lower tubes 110 , 115 of the device 100 . a distal end 225 of the shaft 205 protrudes from the lower tube 115 and terminates in an instrument tip 230 . the instrument tip is used to perforate the skin and provide a means for the distal end 225 of the shaft 205 to enter the abdomen of the patient . turning now to fig6 and 7 , operation of the strengthening device is illustrated , with fig5 depicting the strengthening device 100 in its uncompressed position . as shown therein , once the medical device ( e . g ., a laparoscopic tool ) is attached to the device 100 , the instrument tip 230 on the distal end 225 of instrument shaft 205 is utilized to perforate the skin 505 of a patient . typically the device 100 is initially held with two hands as it is positioned on the patient . the instrument tip 230 is percutaneously passed through a patient &# 39 ; s abdomen and stops when the foot 135 presses against the skin or trocar . as discussed above , foot 135 prevents the device 100 from entering the percutaneous area 505 . the foot 135 may be secured to the patient to prevent movement of the device 100 utilizing an adhesive pad or through the use of sutures provided through apertures 140 . in particular , at his point the surgeon has the option of attaching sutures to the foot 135 through openings 140 to secure the device to the patient , or can expose an adhesive surface on the underside of the foot 135 . the foot 135 also pushes back on the lower tube 115 , thus providing a compression force to the elongated spring housed within the lower tube 115 . the exposed distal shaft 605 is in its normal position in fig6 . the extent to which the tip 230 of the shaft 205 initially protrudes into the body of the patient ( in the uncompressed position ) may be adjusted by moving the locking assembly 120 upward or downward ( e . g ., by rotating ). in connection with this , the locking assembly 120 permits the upper tube assembly 110 and lower tube assembly 115 to be held in place at desired lengths through a tightening means . in an embodiment , the tightening means may consist of rotating fixed attachment that can be adjusted by the operator . with reference to fig7 , when it is desired to insert the instrument tip 230 further into the patient , pressure is applied at the instrument handle assembly 220 . in particular , when further reach is required by the surgeon , pressure is applied to the handle assembly 220 and distal portion 225 of the shaft 205 is extended further out . the compression of the elongated spring 130 inside the tube 115 can provide extra support to the shaft , further increasing its strength and rigidity . indeed , the pressure applied is transferred to both the upper and lower tubes 110 , 115 . since the elongated spring is housed within the lower tube 115 , the lower elongated spring 130 compresses , permitting the distal end 225 of the shaft 205 to extend outwards and into the patient . as the lower tube 115 compresses in size , the exposed distal shaft 605 expands directly proportional to the distance moved by the compression of the lower tube 115 . importantly , the large diameter sleeve ( i . e ., tubes 110 , 115 and elongated spring 130 ) surrounds the small diameter instrument shaft 205 , thereby increasing its strength , rigidity and load carrying capacity by adding support and reducing the instrument &# 39 ; s ability to bend . referring now to fig8 , a strengthening device 400 having an elongated spring within the upper tube 110 is illustrated in use . the instrument tip 230 may be inserted into a patient and the device 400 secured to the body of a patient in the manner described above . when it is desired to insert the instrument tip 230 further into the patient , pressure is applied at the instrument handle assembly 220 , thus compressing the elongated spring and collapsing the upper tube 110 . as the upper tube 110 compresses in size , the exposed distal shaft 605 expands directly proportional to the distance moved . as indicated , the tubes 110 , 115 and elongated spring within the upper tube 110 ) surrounds the small diameter instrument shaft 205 , thereby increasing its strength , rigidity and load carrying capacity by adding support and reducing the instrument &# 39 ; s ability to bend . with respect to fig9 an isometric view of a strengthening device 300 for an instrument shaft according to another embodiment of the invention is illustrated . strengthening device 300 is substantially similar to strengthening device 100 , where like reference numerals designate like parts . as shown therein , both the upper tube 110 and lower tube 115 house elongated springs 305 , 310 , respectively , therein . the use of two elongated springs 305 , 310 in the upper and lower tubes 110 , 115 provide a greater degree of rigidity and strength to the medical device and , more particularly , to the shaft 205 of the medical device , as discussed in detail below . as illustrated in fig6 , the elongated springs 305 , 310 are preferably fully contained within the upper and lower tubes 110 , 115 . the tubes 110 , 115 are collapsible and / or compressible to conform to the elongated springs 305 , 310 . the telescoping tubes are also collapsible . typically the upper spring 305 slides into the upper tube 110 and is retrained between the locking assembly 120 and the attachment mechanism 105 . lower spring 310 slides into the lower tube 115 and is retained between the locking assembly 120 and the swivel ball joint assembly 145 . in particular , the elongated springs 305 , 310 are held in place by the force they apply at their respective ends . referring now to fig1 , in operation , as both collapsible tubes 110 , 115 are compressed by the force exerted on them by the instrument handle assembly 220 , they begin to compress to a smaller length . in particular , as the upper and lower tubes 110 , 115 compresses in size , their combined compression distance ( i . e ., shortening ) corresponds with the extra distance the exposed distal shaft 605 travels into the patient . importantly , during this compression , the tubes 110 , 115 and elongated springs 305 , 310 surround the small diameter instrument shaft 205 , thereby increasing its strength , rigidity and load carrying capacity by adding support and reducing the instrument &# 39 ; s ability to bend . with respect to fig1 an isometric view of a strengthening device 500 for an instrument shaft according to yet another embodiment of the present invention is illustrated . the strengthening device 500 is generally similar to the device 100 described above , where like reference numerals designate like parts . however , as shown therein , the device 500 includes a single collapsible tube 150 that extends from the foot 135 to the attachment mechanism 105 ( rather than upper and lower tubes ). in this embodiment , a single elongated spring 405 is housed within the tube 150 . as illustrated in fig1 , in use , after the percutaneous skin is penetrated by the instrument tip 230 , the foot 135 protects the strengthening device 500 from sliding into the patient and also provides a resistance pressure that is used to help compress the elongated spring 405 and collapsible tube 150 . as discussed above , this allows the exposed distal shaft 605 to penetrate further into the patient , while providing support to the portion of the shaft 205 outside of the patient &# 39 ; s body . the foot 135 pushes back minimally against the surface of the patient &# 39 ; s skin , thereby not interfering with the normal inward and outward motion of the instrument during the procedure . this force can be adjusted to balance the device against the forces or friction and gravity , or can be reduced or increased to provide a counter force that helps control the instrument &# 39 ; s position . the foot 135 may be fabricated of but not limited to plastics , or metal alloys . it may be secured through suture holes 140 located along the circumference . the foot 135 may be held against the skin with a force from the sleeve , or may be physically attached to the patient via sutures or adhesive materials . in the case that trocars are being used with the instrument , the foot 135 would be pressed against the trocar rather than the skin , but would be held there by the same forces and mechanisms . notably , the device 500 of fig1 and 12 provides a great amount of collapsibility and strengthening to an instrument used therewith . as pressure is exerted downwards on the tube 150 and spring 405 , the spring 405 compresses and becomes more rigid , thereby transferring that rigidity to the shaft or medical device . in an embodiment , the upper and lower tubes 110 , 115 of the devices according to the various embodiments described above are made out of plastics , aluminum or metal alloys , although other materials may also be utilized without departing from the broader aspects of the present invention . the upper and lower tubes 110 , 115 are collapsible , thus decreasing in length as greater pressure is applied permitting the elongated springs therewithin to compress and provide rigidity to the shaft or medical instrument . in an embodiment , the tubes 110 , 115 may have crimped or ridged edges along their circumference that permit their lengths to collapse and conform to shorter spring length during use , as discussed above . it should be noted that the strengthening devices disclosed herein are not limited to providing rigidity and strength to just a laparoscopic instrument shaft but also other elongated instruments or devices that would benefit from increased load carrying capacity or increased rigidity . in any of the various embodiments described above , the compression of the elongated spring provides rigidity and strength to the instrument shaft received therethrough . this is accomplished by the compression action of the spring ( s ), forming a wall , further limiting the movement of the shaft that is outside the patient but inside the sleeve / spring . importantly , the strengthening device is adapted to strengthen the shaft of an instrument extending sleeve by applying a biasing force to the shaft of the instrument . the device may be directly coupled to a proximal part of the instrument , to a port , or may be coupled directly to a patient , and may be permanently coupled to the instrument or manually coupled to the instrument as needed . the strengthening device also includes a mechanism which applies an equalizing force to the tubular member and is adjustable . as the surgical instrument is extended through the opening the medical instrument is further stabilized by the axial force applied by a ballast spring or other feature . moreover , as discussed hereinbefore , the swivel ball joint assembly 145 allows movement of the strengthening device 100 and shafts supported by the device 100 to pivot at different angles , permitting the distal end of the strengthening device 100 ( attached to an instrument head , not shown ) to reach areas inside the patient that wouldn &# 39 ; t normally not be accessible while being supported by the foot 135 . although this invention has been shown and described with respect to the detailed embodiments thereof , it will be understood by those of skill in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention . in addition , modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof . therefore , it is intended that the invention not be limited to the particular embodiments disclosed in the above detailed description , but that the invention will include all embodiments falling within the scope of this disclosure .
the present invention is directed towards surgical devices and a method used in minimally invasive surgery whereby a device is incorporated into or onto an instrument to strengthen its shaft and improve its functionality in minimally invasive surgery . the primary goal of the invention is to increase the strength and rigidity of an instrument by using a specially designed sleeve that strengthens the instrument , thereby reducing its ability to bend and increasing its load carrying capacity . the invention will provide a system that gives extra strength and rigidity to small instrument shafts , so that surgeons can still safely and reliably perform their procedures , but can also use incisions that are as small as possible .