US20090187080A1 - Distraction and retraction assemblies - Google Patents

Distraction and retraction assemblies Download PDF

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Publication number
US20090187080A1
US20090187080A1 US11/660,466 US66046605A US2009187080A1 US 20090187080 A1 US20090187080 A1 US 20090187080A1 US 66046605 A US66046605 A US 66046605A US 2009187080 A1 US2009187080 A1 US 2009187080A1
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Prior art keywords
arm
assembly
arms
retraction
retractor
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Abandoned
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US11/660,466
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English (en)
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Kevin Seex
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Individual
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Individual
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Priority claimed from AU2004904580A external-priority patent/AU2004904580A0/en
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/02—Surgical instruments, devices or methods, e.g. tourniquets for holding wounds open; Tractors
    • A61B17/025—Joint distractors
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/02—Surgical instruments, devices or methods, e.g. tourniquets for holding wounds open; Tractors
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/02—Surgical instruments, devices or methods, e.g. tourniquets for holding wounds open; Tractors
    • A61B17/0206—Surgical instruments, devices or methods, e.g. tourniquets for holding wounds open; Tractors with antagonistic arms as supports for retractor elements
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/28—Surgical forceps
    • A61B17/2812—Surgical forceps with a single pivotal connection
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/28—Surgical forceps
    • A61B17/2812—Surgical forceps with a single pivotal connection
    • A61B17/282—Jaws
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/00234—Surgical instruments, devices or methods, e.g. tourniquets for minimally invasive surgery
    • A61B2017/00238—Type of minimally invasive operation
    • A61B2017/00261—Discectomy
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B2017/0046—Surgical instruments, devices or methods, e.g. tourniquets with a releasable handle; with handle and operating part separable
    • A61B2017/00473—Distal part, e.g. tip or head
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/28—Surgical forceps
    • A61B2017/2808—Clamp, e.g. towel clamp

Definitions

  • the present invention relates to distraction and retraction assemblies.
  • the invention further relates to an improved apparatus for soft tissue retraction in applications including surgery including, but not limited to spinal surgery.
  • the invention also provides an assembly which performs the functions of distraction and retraction optimising mechanical advantage and efficiency in retraction and resisting unwanted pull out of retractors.
  • anterior cervical procedure is an intervertebral fusion procedure that typically involve the steps of removing a portion or all of the affected disc material, spreading apart adjacent vertebrae with a distractor, and inserting an implant bone or cage or prosthetic disc into the space previously occupied by the removed disc material.
  • This procedure can be done either from the front of the patient (anterior interbody fusion) or in the lumbar spine from the back (posterior interbody fusion).
  • U.S. Pat. No. 6,669,699 discloses a Distraction instrument for use in anterior cervical fixation surgery.
  • An intervertebral distraction tool has a clamshell head with upper and lower halves, each having a curved outer surface and a flat inner surface.
  • the distal side of the head is hinged so that the head opens and closes from the proximal side of the head.
  • the hinge is a separating hinge that allows the halves to not only angulate with respect to one another about the hinge axis, but also to vertically separate from one another at the hinge.
  • the distraction separator has decreasing taper at its distal end and a longitudinal bore that accommodates the elongate shaft of the trial so that the separator can be moved longitudinally relative to the shaft.
  • the tapered upper and lower surfaces engage the flat inner surfaces of the head, causing the halves to angulate about the hinge axis of the [head, thereby opening the head.
  • U.S. Pat. No. 6,743,231 discloses temporary spinal fixation apparatuses and methods for temporarily fixing the relative position of spinal implant assemblies until a permanent fixation position is determined.
  • the disclosed apparatuses and methods enhance the ease of placement of spinal implant assemblies and facilitates the accuracy of positioning of the spinal vertebrae. This apparatus can reduce the number of steps needed to perform spinal surgery and can decrease the likelihood of post-operative complications.
  • U.S. Pat. No. 6,017,342 discloses a compression and distraction instrument having two pivotally connected handles. Jaw portions engage objects, such as human bone, for purposes of manouvering.
  • a control screw connects with the handles, through a mechanical advantage arrangement, and the screw pivots the jaw portions for the engagement of the objects.
  • the screw is axial of the instrument, and, in the other embodiment, the screw is transverse thereto, both have mechanical advantage.
  • U.S. Pat. No. 6,712,325 of Mar. 30, 2004 discloses a spinal disc space distracter for separating adjacent elements, such as vertebrae.
  • the distracter preferably has a scissors-type distracting mechanism, either in a simple scissors or double-acting scissors configuration.
  • the distracter includes blades that are removable from the jaws of the distracter such that different blades may be used depending on the patient and situation with which the distracter is to be used.
  • the jaws include a mating fixture and the blades include a mating portion for removable association with the mating fixture.
  • a spinal disc distracter is provided to allow for an implant insertion technique to be performed during distraction of the disc space.
  • the implants are slid into the disc space between the distracter blades, preferably while the blades are in contact with the upper and lower surfaces of the adjacent vertebral bodies.
  • the distracter is formed to be as minimally invasive and atraumatic as possible such that it may readily be used in an anterior or anterolateral approach.
  • the distracter is configured to be used in the confined spaces of the human anatomy through a small surgical incision.
  • This distracter has a scissor-like configuration with a pair of handles pivotally connected together.
  • a distracter jaw is coupled to a distal end of each handle such that movement of the handles together draws the jaws apart to separate the vertebrae being treated.
  • the jaws and handles are pivotally coupled together in a double-acting scissor-like configuration to further reduce the space required to move the jaws apart and thus further minimize the invasiveness of the device and procedure.
  • the handles, jaws, and distracter mechanism may all lie in the same plane, in order to facilitate visualization of the treatment site during distraction and insertion of an implant, at least the handles may be angled away from the plane of the distracter jaws.
  • a locking mechanism preferably is provided adjacent to or in the handle to maintain distraction.
  • the locking mechanism may include a spindle or threaded bolt mounted on a first handle and passing through the second handle.
  • An internally threaded speed nut is rotatably mounted on the threaded bolt such that movement of the speed nut along the bolt selectively inhibits movement of the second handle away [from the first handle and thus maintains the vertebrae at the desired distracted [position.
  • the blades of the distracter are configured to increase versatility of the distracter and are removably coupled to the distracter jaws. Thus, the blades may be changed, as necessary or desired, for a given procedure or patient.
  • the blades of the distracter are gradually curved to be out of the plane of the distracter mechanism. Because of the gradual curve, the distal end of the jaws may safely be manipulated through the patient's body with as minimal contact as possible with organs and vasculature including major blood vessels. Moreover, such curvature permits insertion through a smaller incision because of the increased manipulability of the gradually curved blades through small openings and spaces.
  • U.S. Pat. No. 6,740,119 May 25, 2004 discloses a method of distracting vertebral bones to their proper anatomical spacing including sequentially inserting and removing a series of progressively wider cylindrical spacer elements into the intervertebral space between adjacent vertebral bones until the distance between the vertebral bones is anatomically appropriate
  • the path of least resistance is up and as the retractor opens even the slight bending tends to produce a vector of force up as the blade follows the path of least resistance out of the wound leading to unwanted displacement of the retractor and therefore compromised retraction.
  • the third reason they slip is that the tissues under retraction stretch reducing their counter force. As self retaining retractors rely on counter force for stability as this is reduced loosening inevitably occurs.
  • Some known retractor blades have short spikes for bony fixation that create a point of leverage allowing limited movement of the blade.
  • Other retractor systems allow for fixing a retractor blade to bone within a wound via pins or screws.
  • Some known retractor systems allow rotation of a retractor blade around an axis of rotation attached to a frame that is outside the wound e.g. SynframeTM from SynthesTM.
  • HohmansTM and TaylorTM retractors have an integral point that is either hammered into bone or pushed into a position to provide bone fixation leverage. These are widely used in orthopaedic surgery.
  • a TaylorTM type retractor blade is known which incorporates a tube for a securing pin.
  • lever type retractors such as a hip retractor system designed by Dr R Barry Sorrells.
  • a rail system for retractor blades and a blade that has means for fixation to bone with screws Also known is a hip retractor system designed by a Dr S David Stulberg using only pins that are either drilled or hammered into the bone. Some of these can bend or lever slightly but allow no true rotation.
  • External frames for securing levered retractors are also known. For example an assistant (surgeon) free self-retaining hip surgery retractor designed by Dr S David Stulberg is known.
  • An anterior cervical system whereby retraction blades for cranial and caudal (top and bottom) part of wound are slid over known distraction pins. Additional lateral (side to side ) retractors are still required and unconnected. These blades are loose and can rotate only about axis of pin, (which is not very useful) and are not adjustable. They provide no lateral retraction parallel to spine which is a much greater problem and which is addressed only in the present invention to be described below.
  • the ProdiscTM anterior cervical system for cervical disc replacement has distraction screws with distraction arms that slide down over screws.
  • the ProdiscTM uses a screw cap at top that secures the distraction arm, with downward pressure on to the base of the screw.
  • the present invention in one form provides improvements in distraction and retraction assemblies.
  • the invention further provides an improved apparatus for soft tissue retraction in applications including surgery and including, but not limited to spinal surgery and which ameliorates the aforesaid disadvantages of the known retractors.
  • the invention also provides an assembly which performs the functions of distraction and retraction optimising mechanical advantage and efficiency in retraction and resisting unwanted pull out of retractors. More particularly, the invention provides an assembly allowing secure anchorage of retractors and also longitudinal and rotational adjustment of the retractors to adjust retraction forces.
  • the invention further relates to an assembly which performs the aforesaid retraction functions in conjunction with applied distraction of vertebrae using distraction pins and co operating sleeves so that mechanical advantage in both distraction and retraction is achieved optimising efficiency in retraction and resisting unwanted pull out of retractors.
  • the present invention employs in one form the principle of fixation into bone (either directly or indirectly) to provide a secure anchorage and base for a retractor blade and also a stable axis for rotation of the blade within the wound without the prior art unwanted dislocations .
  • the invention improves tissue exposure and surgical site access and minimizes soft tissue injury, bruising etc (due to the more controlled and reduced movements against tissues) whilst allowing variable selective rotation of at least one retractor blade as required during the surgical procedure.
  • the combined features of the ability to adjust retraction pressure and reduce tissue pressure applied by the retractors thus minimizing tissue injury while maintaining stability of the blade distinguishes the present invention from the known prior art.
  • the direct or indirect fixation (anchorage ) to bone of a retractor prevents unwanted slippage and avoids the need for readjustment apart from the selected amount of rotation.
  • the stable axis of rotation from within a surgical wound also imparts a mechanical advantage to retraction pressure reducing operator fatigue. Bone fixation with rotation is achieved in a number of different ways allowing application in numerous anatomical situations.
  • fixation to bone, link, blade and means of rotation may be direct retractor engagement such as that described with reference to FIG. 1 below or the fixation may be indirect such as that described with reference to FIG. 20 accomplished by various combinations of components.
  • This invention in all its forms has application whenever bone fixation is available principally in spinal and orthopaedic surgery but also other surgical disciplines.
  • the present invention comprises:
  • an assembly for combined retraction of wound margins of soft tissue and distraction of vertebrae including; a pair of pins anchored in said vertebrae; sleeves concentrically engaging said pins; means to apply a distraction force to said pins via said sleeves; a first side arm having a first end including a recess capable of engaging one said pins and a second end including connection means which releasably receives a first retractor arm via a mating profile; a second side arm having a first end including a recess capable of engaging the other of said pins and a second end including connection means which releasably receives a second retractor arm via a mating profile; wherein said respective connection means each allow rotatable adjustment of each said retractor arms to retract said soft tissue margins.
  • the present invention comprises:
  • an assembly for retraction of wound margins of soft tissue including; a first side arm having a first end including a recess capable of engaging a pin anchored in a vertebrae, and a second end including connection means which releasably receives a first retractor arm via a mating profile; a second side arm having a first end including a recess capable of engaging a second pin and a second end including connection means which releasably receives a second retractor arm via a mating profile; wherein said respective connection means each allow rotatable adjustment of each said retractor arms to retract said soft tissue margins.
  • sleeves concentrically engaging said pins; the assembly further comprising means to apply a distraction force to said pins via said sleeves;
  • the present invention comprises:
  • an assembly allowing distraction of adjacent vertebrae and retraction of soft tissue;
  • the assembly comprising; means to apply a distraction load to said vertebrae via pins fixed to each vertebrae; the assembly further including; a first side arm having a first end including a recess capable of engaging a first said pins anchored in a vertebrae, and a second end including connection means which releasably receives a first retractor arm via a mating profile; a second side arm having a first end including a recess capable of engaging a second of said pins and a second end including connection means which releasably receives a second retractor arm via a mating profile; wherein said respective connection means each allow rotatable adjustment of each said retractor arms for adjustment of a retraction force applied to said soft tissue margins.
  • the present invention comprises:
  • an assembly allowing distraction of at least one vertebrae and retraction of soft tissue; the assembly comprising; means to apply a distraction load to said vertebrae via first and second distraction pins, a first retractor comprising a first side arm having a first end including a recess capable of engaging a first said pins anchored in a vertebrae, and a second end including connection means which releasably receives a first retractor arm via a mating profile; a second retractor having a second side arm having a first end including a recess capable of engaging a second of said pins and a second end including connection means which releasably receives a second retractor arm via a mating profile; wherein said respective connection means each allow rotatable adjustment of each said retractor arms for adjustment of a retraction force applied to said soft tissue margins.
  • the present invention comprises:
  • a retraction assembly for retracting soft tissue the assembly comprising; a first set of jaws defining a recess for receiving therein a first pin attached to a first vertebrae and including an arm which receives and retains thereon a first retractor capable of rotation about said arm; a second set of jaws defining a recess for receiving therein a second pin attached to a second vertebrae and including an arm which receives thereon a second retractor capable of rotation about said arm.
  • the present invention comprises:
  • a retraction assembly comprising a first member including a first arm having a set of jaws defining a recess; a second arm extending from the first member; the second arm having means to receive and releasably retain a first retractor; a second member including a first arm having a set of jaws defining a recess; a second arm extending from the second member; the second arm on said second member having means to receive and releasably retain a second retractor; wherein, when the recess of said first member engages a first pin and the recess of said second member engages a second pin each said first and second retractors, retract wound margins in soft tissue; wherein each said retractors are rotationally adjustable relative to respective said second arms of said first and second members.
  • the present invention comprises:
  • a retractor assembly for retracting wound margins the assembly comprising; a first retraction member having a first end which includes a recess for engaging a distracter pin inserted in a vertebrae, a second member integral with said first retraction member and including a free end comprising a first retractor blade for retracting one said wound margins; a second retraction member having a first end which includes a recess for engaging distracter pins inserted in a vertebrae, a second member integral with said second retraction member and including a free end comprising a second retractor blade for retracting a second of said wound margins.
  • the present invention comprises:
  • a distraction and retraction assembly comprising; first and second distraction pins; sleeve members adapted to concentrically engage said pins for transmission of a distraction force on each pin; first and second retraction members; said first retraction member having a first arm having a set of jaws defining a recess which engages one said pins and a second arm extending from the first member; said second arm comprising a blade capable of retraction of soft tissue; said second retraction member including a first arm having a set of jaws defining a recess engaging a second one of said pins and a second arm extending from the second member; said second arm of said second retraction member comprising a blade capable of retraction of soft tissue; wherein, each said first and second arms engage via mating formations which allow lateral and rotational adjustment of each said first and second retractors.
  • each said set of jaws are disposed in a common plane and engage the pins anchored in vertebrae.
  • each said arms include spline formations which engage with corresponding formations on respective first and second retractors.
  • the spline formations on each said arms provide a mating engagement which allows longitudinal and rotational adjustment of said arms.
  • each said blades include openings which receive and retain a tool adapted for adjustment of the orientation of said blades.
  • FIG. 1 shows a perspective view of a retractor assembly according to one embodiment
  • FIG. 2 shows an elevation view of an alternative retractor assembly.
  • FIG. 3 shows an enlarged view of a jaw pin of the retractor assembly of FIG. 2 according to one embodiment
  • FIG. 4 shows a side elevation view of the jaw pin of FIG. 3 .
  • FIG. 5 shows an elevation view of a retractor assembly according to an alternative embodiment.
  • FIG. 6 shows an enlarged view of a jaw pin and shoulder of the retractor assembly of FIG. 5 according to one embodiment
  • FIG. 7 shows a side elevation view of the jaw pin of FIG. 6 .
  • FIG. 8 shows an elevation view of a retractor assembly according to an alternative embodiment.
  • FIG. 9 shows an enlarged view of a jaw of the retractor assembly of FIG. 8 .
  • FIG. 10 shows a side elevation view of the enlarged jaw of the formation of FIG. 9 .
  • FIG. 11 shows a perspective view of a retractor assembly conical anchor according to one embodiment
  • FIG. 12 shows an elevation view of the anchor of FIG. 11 .
  • FIG. 13 shows an end elevation of the anchor of FIG. 11 .
  • FIG. 14 shows a perspective view of a retractor assembly cup anchor according to an alternative embodiment
  • FIG. 15 shows an elevation view of the anchor of FIG. 14 .
  • FIG. 16 shows an end elevation of the anchor of FIG. 14 .
  • FIG. 17 shows a perspective view of a retractor assembly mushroom anchor according to an alternative embodiment
  • FIG. 18 shows an elevation view of the anchor of FIG. 17 .
  • FIG. 19 shows an end elevation of the anchor of FIG. 17 .
  • FIG. 20 shows a perspective view of a retractor assembly capable of concurrent distraction by co operating anchor pins according to a preferred embodiment.
  • FIG. 21 shows a perspective view of a retractor assembly retraction arm anchored to an anchor pin by a joining member.
  • FIG. 22 shows an enlarged view of the retractor arm anchor pin of FIG. 21 .
  • FIG. 23 shows an elevation view of the arm anchor pin of FIG. 22 .
  • FIG. 24 shows an elevation view of the arm anchor pin of FIG. 22 .
  • FIG. 25 shows a retractor arm according to an alternative embodiment in a substantially vertical orientation.
  • FIG. 26 shows the retractor arm of FIG. 25 rotated clockwise from the vertical.
  • FIG. 27 shows a retractor arm and anchorage pin assembly according to an alternative embodiment with the retractor arm in a substantially vertical orientation.
  • FIG. 28 shows the retractor arm of FIG. 27 rotated clockwise from the vertical.
  • FIG. 29 shows the anchorage pin of FIGS. 27 and 28 with retractor arm released from the anchor head.
  • FIG. 30 shows the retractor arm of FIG. 31 separated from the joining member
  • FIG. 31 shows a retractor arm and joining member assembly according to an alternative embodiment.
  • FIG. 32 shows an enlarged view of the joining member of FIG. 31 .
  • FIG. 33 shows a retractor arm and joining member assembly according to an alternative embodiment.
  • FIG. 34 shows an enlarged view of the joining member of FIG. 33 .
  • FIG. 35 shows a retractor arm and joining member assembly according to an alternative embodiment.
  • FIG. 36 shows an enlarged view of the joining member of FIG. 35 .
  • FIG. 37 shows an exploded view of a retractor arm and anchorage pin assembly according to an alternative embodiment.
  • FIG. 38 shows a perspective view of the anchor pin shown in FIG. 37
  • FIG. 39 shows an end elevation of the anchor pin of FIG. 38 .
  • FIG. 40 shows a perspective view of an assembly including an abbreviated retractor arm and joining member including a locating spline assembly according to one embodiment
  • FIG. 41 shows the arrangement of FIG. 40 with retractor arm rotated to an alternative position disposed normally to the plane of the joining member.
  • FIG. 42 shows an exploded view of the assembly of FIG. 40 .
  • FIG. 43 shows an exploded view of a retraction arm and anchorage assembly according to an alternative embodiment.
  • FIG. 44 shows an assembled view of the retraction arm and anchorage assembly of FIG. 43 .
  • FIG. 45 shows the retractor arm in isolation .
  • FIG. 46 shows a perspective view of anchor showing an oblique recess.
  • FIG. 47 shows a perspective view of a retractor assembly of the type described in FIG. 1 engaging an anchor.
  • cervical distraction of vertebrae involves the use of pins temporarily fixed to the vertebrae to be distracted.
  • pins are used one above and one below a disc or vertebral body of interest.
  • these pins have only been used for distraction purposes via sliding tubes that fit axially over the pins and connect to an associated distraction mechanism.
  • the role of the pin has been expanded to perform one or more of the following roles.
  • the pin acts as x-ray marker to estimate a midline of a spine for cage or prosthetic disc replacement.
  • the known and commonly used Caspar type distracter is then secured to the spine.
  • a mechanical advantage during distraction is provided the closer the load is applied to the vertebrae due to a reduced moment arm and elimination of a bending moment on the pins so it is desirable to provide an assembly which meets this objective. Accordingly, according to the invention a shear force is applied at a base of pins to be distracted.
  • retractor arm may be taken to be synonymous with side arms, retractor blade and retraction member.
  • a reference to blades will be taken to include a reference to retractors or retractor arms
  • Spikes are useful where a line of pull is oblique to a line of insertion and where anatomy is unfavorable for screws. Multiples screws or spikes may be used. A portion of the screw or spike may engage and link to other components. This portion is referred to as the anchor.
  • Anchor recess shapes which may be used (see drawing/s) include the following non limiting embodiments:
  • Retractor assembly 1 is a generally scissor action retractor comprising co operating scissor members 2 and 3 joined by pivot pin 4 .
  • Assembly 1 is operated by handle 5 including openings 6 and 7 which receive fingers of a user to effect the scissor action.
  • Handle 5 further comprises a bridge 8 which allows relative movement between finger loops 9 and 10 .
  • bridge 8 preferably includes an opposing ratchet allowing selective positioning of finger loops 9 and 10 .
  • Scissor member 3 terminates in a formation 11 comprising a recess 12 having therein a conical jaw 13 .
  • a portion of a flat blade between the junction 4 of arms 2 and 3 (using FIG. 1 as example) and formation 14 constitute a flat surface which act as blade for purpose of tissue retraction as the retractor rotates about axis 18 .
  • the angulation between point 4 and formation 14 is for the purpose of improved visualization of the formation 14 during surgical fixation.
  • Scissor member 2 terminates in a formation 14 comprising a recess 15 having therein a conical jaw 16 .
  • Jaws 13 and 16 preferably lie along a common axis and are disposed in opposing relationship. Alternatively, jaws 13 and 16 may be disposed on parallel axes. Jaws 13 and 16 are conical each terminating in a sharp point adapted for engagement directly into bone or with an anchorage enabling rotation of assembly 1 about axis 17 in a rotational direction shown by arrow 18 .
  • Retractor assembly 20 is a generally scissor action retractor comprising co operating scissor members 21 and 22 joined by pivot pin 23 .
  • Assembly 20 is operated by handle 24 including openings 25 and 26 which receive fingers of a user to effect the scissor action.
  • Handle 24 further comprises a bridge 27 which allows relative movement between finger loops 19 a and 19 b . This also contains a ratchet mechanism 27 a to lock members 21 and 22 in position.
  • Scissor member 22 terminates in a formation 28 comprising a recess 29 having therein a conical jaw 30 .
  • Scissor member 21 terminates in a formation 31 comprising a recess 32 having therein a conical jaw 33 .
  • Jaws 30 and 33 preferably lie along a common axis and are disposed in opposing relationship. Jaws 30 and 33 are conical each terminating in a sharp point adapted for engagement with bone directly or with an anchorage enabling rotation of assembly 20 about axis 34 .
  • FIG. 3 shows an enlarged view of jaw pin 30 of the retractor assembly of FIG. 2 .
  • FIG. 4 shows a side elevation view of the jaw pin 30 of FIG. 3 .
  • Retractor assembly 40 is also a generally scissor action retractor comprising co operating scissor members 41 and 42 joined by pivot pin 43 .
  • Assembly 40 is operated by handle 44 including openings 45 and 46 which receive fingers of a user to effect the scissor action.
  • Handle 44 further comprises a bridge 47 which allows relative movement between finger loops 45 and 46 .
  • This also contains a ratchet mechanism 47 a .
  • Scissor member 42 terminates in a formation 48 comprising a recess 49 having therein a conical jaw 50 .
  • Scissor member 41 terminates in a formation 51 comprising a recess 52 having therein a conical jaw 53 .
  • Jaws 50 and 53 are conical and preferably lie along a common axis and are disposed in opposing relationship. Jaws 50 and 53 each terminate in a sharp point adapted for engagement with an anchorage enabling rotation of assembly 40 about axis 54 . Assembly is characterised in having flanges 55 and 56 at the base of respective conical jaws 50 and 53 . Flanges 55 and 56 form respective shoulders on which an anchorage bears when assembly 40 engages an anchorage.
  • FIG. 6 shows an enlarged view of jaw pin 50 and flange shoulder 55 of the retractor assembly of FIG. 5 .
  • FIG. 7 shows a side elevation view of the enlarged jaw pin formation 48 of FIG. 6 .
  • FIG. 8 there is shown a perspective view of a retractor assembly 60 according to an alternative embodiment.
  • Retractor assembly 60 is also a generally scissor action retractor comprising co operating scissor members 61 and 62 joined by pivot pin 63 .
  • Assembly 60 is operated by handle 64 including openings 65 and 66 which receive fingers of a user to effect the scissor action.
  • Handle 64 further comprises a bridge 67 which allows relative movement between finger loops 65 and 66 preferably by ratchet adjustment 67 a .
  • Scissor member 62 terminates in a formation 68 comprising a recess 69 having therein a jaw 70 .
  • Scissor member 61 terminates in a formation 71 comprising a recess 72 having therein a jaw 73 .
  • Jaws 70 and 73 have enlarged mushroom like points 70 a and 73 a respectively and preferably lie along a common axis and are disposed in opposing relationship.
  • Enlarged mushroom like points 70 a and 73 a are adapted for engagement with an anchorage enabling rotation of assembly 60 about axis 74 .
  • Assembly 60 is essentially characterised by the blunt mushroom formations 70 a and 73 a.
  • FIG. 9 shows an enlarged view of jaw 70 of the retractor assembly 60 of FIG. 8 .
  • FIG. 10 shows a side elevation view of the enlarged jaw 70 of formation 68 of FIG. 9 .
  • FIG. 11 shows a perspective view of a retractor assembly conical anchor according to one embodiment.
  • Anchor 80 comprises an anchor pin 81 depending from base 82 .
  • Base 82 supports an anchor head 83 .
  • Axis 84 is co linear with pin 81 and head 83 .
  • Head 83 includes conical recesses 85 and 86 and normally disposed thereto recesses 87 and 88 .
  • Anchor 80 is ideally suited for use with the retractor assemblies 1 , 20 and 40 of FIGS. 1 , 2 and 5 respectively.
  • pin 81 includes formations 89 which facilitate penetration into a bony anchorage.
  • FIG. 12 shows an elevation view of the anchor 80 of FIG. 11 with corresponding numbering.
  • FIG. 13 shows an end elevation of the anchor 80 of FIG. 11 .
  • FIG. 14 shows a perspective view of a retractor assembly cup anchor according to one embodiment.
  • Anchor 90 comprises an anchor pin 91 depending from base 92 .
  • Base 92 supports an anchor head 93 .
  • Axis 94 is co linear with pin 91 and head 93 .
  • anchorage pins or screws may be at an angle to an anchor head and could be used for fixation of the anchor to bone where anatomy of bone is more vertically orientated eg around an acetabular cup in hip joint surgery. Screwdrivers for inserting screws in a direction not co linear with a screwdriver are known and could be employed. Simple impaction of a pin portion of an anchor is also envisaged.
  • Anchor 90 is ideally suited for use with the retractor arm as shown in FIGS. 43-45 . In practice the anchor 90 would be inserted into bone at the desired position in bone using awl and screw driver or if pin direct hammering. A retractor blade such as that shown in FIG. 28 is then slid in laterally to engage anchor head 93 and this rotates in recess 95 with recess engaging a corresponding round portion of the blade to enable smooth rotation and also to prevent lift out. Variable rotation with stability thus accomplished.
  • FIG. 15 shows an elevation view of the anchor 90 of FIG. 14 with corresponding numbering.
  • FIG. 16 shows an end elevation of the anchor 90 of FIG. 14 .
  • FIG. 17 shows a perspective view of a retractor assembly mushroom anchor 100 according to an alternative embodiment.
  • Anchor 100 comprises an anchor pin 101 depending from base 102 .
  • Base 102 supports an anchor head 103 .
  • Axis 104 is co linear with pin 101 and head 103 .
  • Head 103 includes recesses 105 and 106 and normally disposed thereto recesses 107 and 108 .
  • Anchor 100 is ideally suited for use with the retractor assembly 60 of FIGS. 8 , 9 and 10 respectively.
  • pin 101 includes formations 109 which facilitate penetration into a bony anchorage
  • FIG. 18 shows an elevation view of the anchor 100 of FIG. 17 with corresponding numbering.
  • FIG. 19 shows an end elevation of the anchor 100 of FIG. 11 .
  • FIG. 20 shows a perspective view of a retractor assembly capable of concurrent retraction and distraction by co operating anchor pins according to a preferred embodiment.
  • a retraction and distraction assembly 110 comprising retractor arms 111 and 112 terminating respectively in joining members 113 and 114 which engage anchor pin assemblies 115 and 116 .
  • Retractor arm 111 comprises a first free end portion 117 including a recess 118 and spanning therebetween bridge members 119 and 120 .
  • Bridge members 119 and 120 define spaces 121 and 122 which may attach to an operating tool not shown. The operating tool facilitates rotational movement of retractor arm 111 .
  • Retractor arm 112 comprises a first free end portion 123 including a recess 124 and spanning therebetween bridge members 125 and 126 .
  • Bridge members 125 and 126 define spaces 127 and 128 which may receive an operating tool not shown.
  • the operating tool facilitates rotational movement of retractor arm 112 such that arms 111 and 112 co operate in maintaining retraction of opposing surgical wound margins.
  • Arms 111 and 112 are in use disposed against opposing soft tissue wound margins during surgery to facilitate and maintain adjustable rotational retraction.
  • Arm 111 further comprises blade region 129 which terminates in a formation 130 which defines a recess 131 which receives and retains therein joining arm 132 of joining member 113 .
  • Joining member 113 also comprises a bifurcated portion 133 having two arms which define recess 134 which receives and retains anchorage assembly 115 .
  • Anchorage assembly 115 comprises an anchorage pin 135 having a leading end 136 terminating in a sharp point 137 .
  • Leading end 136 may have thread like screw or pin like to facilitate penetration in bone and a trailing end 138 providing a driving member 138 a to facilitate bone penetration of point 131 .
  • Pin 135 is housed in guide sleeve 139 which compresses bifurcated portion 133 .
  • Joining member 113 locates between base 138 a and end 139 a of sleeve 139 .
  • Guide sleeve 139 has connected thereto an ancillary sleeve 140 which receives in recess 141 a tool (not shown ) to facilitate distraction i.e. separation of anchorage assemblies 116 and 115 along an axis usually but not exclusively parallel to the axes of rotation of arms 111 and 112 .
  • Arm 112 further comprises blade region 112 a which terminates in a formation 142 which defines a recess 143 which receives and retains therein joining arm 144 of joining member 114 . This allows arm 112 to selectively rotate about joining arm 144 .
  • Joining member 114 also comprises a bifurcated portion 145 having two arms which define recess 146 which receives and retains anchorage assembly 116 .
  • Anchorage assembly 116 comprises an anchorage pin 147 having a leading end 148 terminating in a sharp point 149 to facilitate penetration in bone and a trailing end 150 providing a driving member 151 to facilitate compression of 152 against 145 securing joining member 114 .
  • Pin 147 is housed in guide sleeve 152 which engages bifurcated portion 145 .
  • Guide sleeve 152 has connected thereto an ancillary sleeve 153 which receives in recess 154 a tool (not shown ) to facilitate distraction of anchorage assemblies 116 and 115 along an axis parallel to the axes of rotation of arms 111 and 112 .
  • the sleeves 152 and 139 engage onto square portions of respective pins.
  • the bifurcated elements 133 and 145 also engage snugly around square portions of pins 135 and 147 . This connection prevents independent rotation of elements. Combined rotation of all elements is prevented by joining two sleeves and pins together with an external distraction assembly.
  • This distraction assembly (not shown) may join with the assembly as shown via recess 154 and 158 or may be integral as in existing Caspar systems.
  • the assembly 110 allows distraction along an axis parallel to the axes of rotation of arms 111 and 112 and selective opposing rotational adjustments of arms 111 and 112 and if required removal of one or other of arms 111 and 112 .
  • FIG. 21 shows a perspective view of a part retractor assembly showing retraction arm 160 anchored to an anchor pin 161 by a joining member 162 according to an alternative embodiment.
  • Arm 160 comprises free end portion 163 and blade region 164 which terminates in a formation 165 which defines a recess 166 which receives and retains therein joining arm 167 of joining member 162 .
  • Joining member 162 also comprises a bifurcated portion 168 having two arms which define recess 169 which releasably receives and retains head 170 of anchorage pin 161 terminating in a sharp point 171 to facilitate penetration in bone.
  • Free end portion 163 includes recess 172 which retains bridge members 173 and 174 .
  • Bridge members define openings 176 and 177 which receive an operating tool to facilitate both selective rotation of arm 160 and detachment from either joining member 162 or anchor 161 .
  • FIG. 22 shows an enlarged view of the retractor arm anchor pin 161 of FIG. 21 with corresponding numbering.
  • Head 170 includes recess 180 which receives bifurcated portion 168 of joining member 162 .
  • Bifurcated portion 168 bears on shoulder 181 and locks against underside surface 182 of head 170 .
  • Shoulder 181 is optional and could be removed allowing bifurcated portion 168 of 162 to be positioned securely between 182 and base plate 170 a.
  • FIG. 23 shows an elevation view of the arm anchor pin 161 of FIG. 22 with corresponding numbering. Point 171 may further comprises formations 183 which facilitate bone penetration.
  • FIG. 24 shows an elevation view of the arm anchor pin 161 of FIG. 22 .
  • This arrangement of blade secured to anchor pin 161 with mechanism permitting rotation has widespread application in but not limited to orthopaedic and spinal surgery and whenever bone fixation possible. Variations of such devices will be obvious to those skilled in the art.
  • FIG. 25 shows a retractor arm 190 according to an alternative embodiment disposed in a substantially vertical orientation. Arm 190 terminates in a formation 191 which includes a locking tang 192 .
  • FIG. 26 shows the retractor arm 190 of FIG. 25 rotated clockwise from the vertical.
  • FIG. 27 shows a retractor arm and anchorage pin assembly 193 according to an alternative embodiment with the retractor arm 190 of FIGS. 25 and 26 in a substantially vertical orientation.
  • Anchorage pin assembly 193 comprises a cup recess 194 which receives formation 191 allowing relative rotation between cup recess 194 and arm 190 .
  • FIG. 23 shows the retractor arm 190 of FIG. 27 rotated clockwise from the vertical.
  • Pin assembly 193 further comprises first abutment 195 and second abutment 196 defining a space therebetween 197 .
  • locking tang 192 engages abutment 195 and locates in space 197 . This occurs when arm 190 is vertical and in longitudinal alignment with pin 199 .
  • Locking tang 192 engages abutment 196 when arm 190 is rotated 30 degrees.
  • abutment 196 may be configured according to the maximum extent of rotation required for arm 190 .
  • Arm 190 may be released from anchorage assembly 193 by anti clockwise rotation from the disposition of FIG. 28 to that shown in FIG. 27 .
  • Arm 190 may then be lifted up and slid laterally to free locking tang 192 from abutments 195 and 196 .
  • FIG. 29 shows the anchorage pin assembly 193 of FIGS. 27 and 28 with retractor arm 190 released from recess 194 of the anchor head 198 . This arrangement permits secure linkage of components while allowing rotation to desired degree. Top and side loading of blade to anchor is achieved.
  • FIG. 30 shows the retractor arm 201 of FIG. 31 separated from a joining member 202 .
  • FIG. 31 shows a retractor arm and joining member assembly 200 according to an alternative embodiment.
  • Assembly 200 comprises a retractor arm 201 and joining member 202 with the retractor arm 201 in a substantially vertical orientation.
  • Arm 201 includes free end portion 203 and blade 204 .
  • End 203 includes bifurcation 205 defining recess 206 .
  • Recess 206 includes bridging members 207 and 208 defining recesses 209 and 210 which receive an operating tool (not shown) which in use facilitates arm rotation for retraction of soft tissues.
  • Blade portion 204 terminates in an enlarged formation 211 defining a recess 212 having a partially cut away wall exposing the interior of recess 212 . This cut away allows insertion and removal of members 202 and 222 plus rotation once centered .
  • Recess 212 receives and retains joining member 202 .
  • FIG. 32 shows an enlarged view of the joining member of FIG. 31 .
  • Joining member 202 is insertable in recess 212 via pivot arm 214 .
  • Pivot arm 214 has preferably intermediate its ends a bridge 215 which terminates in a loop 216 which engages an anchor pin (not shown).
  • Arm 201 may then be rotated through about 30 degrees but it will be appreciated that the wall 217 (see FIG. 30 ) contains notch 217 a that allows rotation of bridge 215 to occur limiting rotation as desired.
  • of recess 212 can be configured to achieve an alternative degree (more or less) of rotation.
  • FIG. 33 shows a retractor arm and joining member assembly 220 according to an alternative embodiment.
  • Assembly 220 comprises a retractor arm 221 and joining member 222 with the retractor arm 221 abbreviated but in a substantially vertical orientation.
  • Blade portion 223 terminates in an enlarged formation 224 defining a recess 225 having a partially cut away wall exposing the interior of recess 225 .
  • FIG. 34 shows an enlarged view of the joining member of FIG. 33 .
  • Recess 225 receives and retains pivot arm 226 about which retractor arm 221 is free to rotate.
  • Pivot arm 226 has preferably intermediate its ends a bridge 227 which terminates in an open saddle 228 which engages an anchor pin (not shown). Arm 221 may then be rotated as required about pivot arm 226 .
  • FIG. 35 shows a retractor arm and joining member assembly 230 according to an alternative embodiment.
  • Assembly 230 comprises a retractor arm 231 and joining member 232 with the retractor arm 231 abbreviated but in a substantially vertical orientation.
  • Blade portion 233 terminates in an enlarged formation 234 defining a recess 235 having a partially cut away wall exposing the interior of recess 235 .
  • FIG. 36 shows an enlarged view of the joining member of FIG. 35 .
  • Recess 235 receives and retains pivot arm 236 about which retractor arm 231 is free to rotate.
  • Pivot arm 236 has preferably at one end a bridge 237 which terminates in an open saddle 238 which engages an anchor pin (not shown). Retractor arm 231 may then be rotated as required about pivot arm 236 .
  • FIG. 37 shows an exploded view of a retractor arm and anchor member assembly 240 according to an alternative embodiment.
  • Assembly 240 comprises a retractor arm 241 and anchor member 242 .
  • Arm 241 includes free end portion 243 and blade 244 .
  • End portion 243 includes bifurcation 245 defining recess 246 .
  • Recess 246 includes bridging members 247 and 248 defining recesses 249 and 250 which receive an operating tool (not shown) which in use facilitates arm rotation for retraction of soft tissues.
  • Blade portion 244 terminates in an enlarged formation 251 defining a recess 252 having a partially cut away wall exposing the interior of recess 252 .
  • Recess 252 receives and retains anchor member 242 .
  • Anchor member 242 comprises anchor head 253 mounted on base 254 .
  • Anchor pin 255 depends from base 254 and in use penetrates bone.
  • Anchor member 242 is insertable in recess 252 of arm 241 via anchor head 253 .
  • Arm 241 rotates about anchor head 253 which is cylindrical to facilitate rotation of arm 241 .
  • Blade portion 244 includes a bifurcated end retainer 256 which provides an abutment against which head 253 bears.
  • FIG. 39 shows an end elevation of the anchor pin of FIG. 38 .
  • the retraction assembly uses a single pin as a point of fixation for retractor blades but without a second pin. This would utilize a single tube not connected to distracter mechanism for surgeons not wishing or able to use distraction.
  • a retraction arm also described as a side arm co operates with a blade portion to perform retraction of soft tissue wound margins.
  • Joining members which engage retractor blades may be flat in one plane or with a bend so that part lies in one plane and another part in another plane allowing rods to sit a few mms below the plane assumed by the jaws of the bifurcated elements to fit a natural contour of a spine.
  • Flat members of the type shown in FIG. 40 are reversible and can be used from top or bottom. Bent joining members/side arms are still reversible but top left could only be used as bottom right and vice versa. Surgeons may choose whether to use two side arms at top i.e. one to left and one to right or one sidearm at top to one side and one from bottom to other. For surgery involving two disc levels, two joining members/side arms may be used from the top and two from the bottom providing longer area of exposure.
  • splines are used to make the engagement between the retractor arms and retractor blades but this is a non limiting engagement arrangement and it will be appreciated by persons skilled in the art that other forms of engagement which preferably accommodate axial release and locking and also selective rotation may be employed.
  • a ratchet mechanism may be used.
  • the retraction blades are drawn according to one embodiment, with splines but this is to be taken as a non limiting arrangement. Not all combinations of flat or offset, open or closed, with or without splines adjustable or non adjustable are shown. Numerous shapes are envisaged to accommodate different areas of the spine (and other parts of the body e.g. in non spinal orthopaedics.)
  • FIG. 40 there is shown a perspective view of an assembly 260 including abbreviated retractor arm 261 and joining member 262 including locating spline assembly 263 according to one embodiment.
  • FIG. 40 shows arm 261 at an oblique angle relative to a horizontal plane through joining member 262 .
  • FIG. 41 shows the arrangement of FIG. 40 with arm 261 rotated to an alternative position disposed normally to the plane of joining member 262 .
  • FIG. 42 shows an exploded view of the assembly 260 of FIG. 40 .
  • Joining member 262 includes a joining shaft 264 terminating in a free end 265 and having a knurled or bevelled surface.
  • Member 262 terminates at its opposite end in a bifurcated member 266 which engages an anchor (not shown) similar to the arrangements previously described.
  • Shaft 264 includes thereon a radial array of splines 267 extending from its circumferential surface 268 .
  • Arm 261 terminates in an enlarged region 269 having a wall 270 which defines a recess 271 adapted to axially receive shaft 264 .
  • Wall 270 has at one end 272 a radial array of elements 273 arranged to align with intermediate spaces between individual splines in spline array 267 . This arrangement allows arm 261 to be selectively released from spline array 267 rotated to alternative positions such as shown in FIGS. 40 and 41 .
  • position of spline on shaft 268 may be varied to opposite end 265 with a corresponding change of mating profile to other end of recess 271 and in a further embodiment blade could contain splines and the shaft the recesses.’ Opposite gender spline mating may also be employed.
  • the number of splines and teeth angles may be varied according to requirements.
  • a surgeon may assemble the combined distracter and retractor assembly of FIG. 20 according to the following regime.
  • the assembly may be employed in an anterior approach to the cervical spine.
  • the first step which is based on a known technique involves insertion of pins in vertebrae to be distracted.
  • Preferably there will be two pins 135 and 147 spaced apart which are distracted to allow access to a disc space in the case for instance where a disc is to be replaced.
  • the distracter pins such as those described as in FIG. 20 are inserted into adjacent vertebrae.
  • first retractor arm 111 or 112 whose configuration is selected to accommodate patient anatomy and allows it to directly or indirectly engage a first of said pins causing an associated rod and blade to lie generally parallel to a longitudinal axis of a spine.
  • Arms 111 and 112 are mounted respectively on arms 132 and 144 of joining members 113 and 114 .
  • Sleeves 139 and 152 are positioned over respective pins 135 and 147 .
  • a retractor blade 111 or 112 such as that described with reference to FIG. 20 is attached if not previously done by sliding respective sleeves ( 130 and 142 ) on the blade along the pivot arm of a joining member 132 , 144 until mating splines (or other mechanically equivalent engagement) engage.
  • the orientation of the retractor blade is set according to a selected circumferential (rotational) engagement of the respective mating opposed splines.
  • the assembly now formed and shown in FIG. 20 provides an ability to both distract vertebrae and retract soft tissue as required, the distraction occurring when a distraction force is applied through the sleeves or tubes 139 and 152 which axially engage the pins 136 and 147 .
  • the degree of retraction is set by engaging the splines at a predetermined position so as to set the retractor arms 111 and 112 at an angle of repose which keeps soft tissue margins apart as required by the surgeon. If the aforesaid description relates to a right side distracter arm and retractor blade assembly there will be a corresponding left hand side arrangement which is preferably symmetrical about a transverse line through a disc space. If the aforesaid description relates to a left side distracter arm and retractor blade there will be a corresponding right hand side arrangement which is again symmetrical about a transverse line through the disc space.
  • the distraction forces are applied at the base of the pins 136 and 147 to optimise mechanical advantage and to eliminate pin bending loads. This assembly described above allows variable distraction poses and movement without removal of retractors—side retractor arms and blades.
  • the retractor blades are fixed at or adjacent to a location where a tip of an end of the Retractor blade is required. This is usually deep in the wound and generally involves firm fixation to an adjacent bony surface via a screw, clamp or other gripping device that connects directly to the blade or via an intermediary linkage.
  • this connection with the fixation device will allow rotation of the blade about the point of fixation, either because the point of fixation itself can rotate, e.g. semicircular spikes forming a pincer or via an intermediary linkage which allows the rotation while remaining in fixation as in the cervical assembly described in detail.
  • This fixation with rotation allows retractor blades to be left in situ throughout a procedure but allowing the surgeon to release the pressure and the retraction forces while working on another area thus reducing the tissue trauma but without having to remove the retractor blade or reposition the retractor blade. Releasing self retaining retractors leads to repeated tissue trauma every time these are reinserted and/or reopened. This system would therefore reduce tissue trauma and save time.
  • the fixation device described in the cervical assembly utilises a pin with a screw thread into the bone and is first embodiment of this principal.
  • FIG. 1 An alternative embodiment such as that described in FIG. 1 uses a variety of fixation devices including pincer type spikes on a curved, angled or straight scissor type handle which grip irregular or curved bony surfaces and then rotate about the pincer grip the retractor blade being attached to the arms or hinges of this device.
  • fixation devices including pincer type spikes on a curved, angled or straight scissor type handle which grip irregular or curved bony surfaces and then rotate about the pincer grip the retractor blade being attached to the arms or hinges of this device.
  • the assembly in FIG. 1 is directly fixed to top and bottom sides at a base of the transverse processes in the lumbar vertebral body.
  • the rotating blade acts as a retractor to aid placement of pedicle screws.
  • FIGS. 21 , 27 , 31 and 37 Use of bone anchors with a blade directly as in FIGS. 21 , 27 , 31 and 37 have multiple applications.
  • Cup anchors FIG. 14
  • FIGS. 28 , 37 and 44 More complex versions of this allowing loading from above, restriction of unwanted motion and locking include those shown in FIGS. 28 , 37 and 44 which by limiting motion improve stability of connection between anchor and respective blade.
  • This combination of components has multiple applications for the purpose of retraction of tissues.
  • Such anchors could also act as components in distraction devices alone or be combined with function as base for rotating retractors as illustrated in FIG. 20 .
  • FIG. 43 shows an exploded view of a retraction arm and anchorage assembly 280 according to an alternative embodiment.
  • Assembly 280 comprises retractor arm 281 which apart from its distal end 282 has similar geometry and operational characteristics to the retractor arms previous described herein.
  • Arm 281 comprises a proximal portion having bridge members 283 and 284 which define recess 285 and 286 adapted to receive an adjustment tool not shown.
  • Arm 281 terminates at distal end 282 in a formation 287 comprising substantially cylindrical ends 288 and 289 and a flat region 290 intermediate therebetween.
  • Assembly 280 also comprises an anchor 291 having an anchor head 292 including a recess 293 , supported on base 294 and a depending anchor pin 295 .
  • Anchor pin 295 may be hammered into bone or alternatively screwed in.
  • the assembly further comprises a locking plate 296 terminating in a locking pin 297 .
  • FIG. 44 shows an assembled view of the retraction arm and anchorage assembly 280 of FIG. 43 .
  • assembly 280 is shown with arm 281 engaged with anchor 291 and locking plate 296 engaging arm 281 via formation 287 at distal end 282 .
  • Cylindrical ends 288 and 289 protrude from recess 293 and flat region 290 intermediate therebetween engages recess 293 .
  • Locking pin 297 engages oblique recess 298 (see FIG. 43 ) to lock arm 281 against rotation.
  • To release arm 281 from anchor 291 locking pin 297 is simply extracted from recess 298 .
  • One advantage of this arrangement is that arm 281 can be inserted and removed within a narrow corridor .
  • FIG. 45 shows arm 281 in isolation . It can be seen from this figure that substantially cylindrical end 288 has a flat region 299 .
  • the flathead anchor is secured to bone.
  • the blade is positioned with section 290 directly above recess 293 .
  • the opening of the recess in the anchor head 293 is such that it engages the leading edges of flattened sections of the blade 290 allowing the blade to slide into position only when the blade is positioned at a set angle. Once fully engaged the blade can rotate. The amount of rotation is restricted by limiting abutment surfaces of blade and anchor head.
  • the rotation brings the larger diameter circular portions of the section 290 under the recess opening preventing it lifting out. It can only be removed by returning to position of entry from where it can be lifted out.
  • the more circular side portions 289 of lower aspect of blade prevent it sliding sideways out of position once engaged.
  • These are optional and the entire base of the blade may have a flat head if desirable to have more side to side freedom.
  • the angle of entry would be set to ease entry while preventing accidental fall out when under retraction or when retraction relaxed.
  • the recess in the anchor head is optional and for a matched locking pin. Once the blade is rotated to a set position this reveals the entire recess and allows insertion of the pin that completely locks the blade in position relative to anchor.
  • FIG. 46 shows a perspective view of anchor 291 showing oblique recess 298 .
  • FIG. 47 shows a perspective view of a retractor assembly 300 of the type described in FIG. 1 engaging an anchor 301 .
  • Opposing conical pins 302 and 303 engage corresponding recesses in anchor 301 .

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ZA200703400B (en) 2008-04-30
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US20140194697A1 (en) 2014-07-10
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