US20040242969A1 - Surgical retractor - Google Patents

Abstract

Apparatus and method for surgery is disclosed which includes a retractor having a substantially planar base defining an opening for overlying an operative site on a patient, and at least one retractor blade slidably mounted to the base. The base is positioned on the patient such that the opening therein overlies the operative site. The operative site is percutaneously accessed, and obstructing tissue is retracted by engaging the tissue with the retractor blade. A surgical instrument is provided which is engageable with the base and operable at the operative site through the opening in the base. A surgical procedure is carried out through the opening in the base with the surgical instrument.

Description

CROSS REFERENCE TO RELATED APPLICATION
• This application claims priority to U.S. Provisional Application Ser. No. 60/016,325 filed Apr. 26, 1996.[0001]
BACKGROUND
• 1. Technical Field[0002]
• The subject disclosure relates to minimally invasive surgical procedures and apparatus, and more particularly to an instrument and method for performing surgery associated with the thoracic cavity.[0003]
• 2. Background of Related Art[0004]
• The diagnosis and treatment of coronary disease and related conditions typically requires access to the heart, blood vessels and associated tissue. Such procedures include cardiopulmonary bypass, valve repair and replacement, and treatment of aneurysms. Access to the patient's thoracic cavity may be achieved by a large longitudinal incision in the chest This procedure, referred to as a median sternotomy, requires a saw or other cutting instrument to cut the sternum and allow two opposing halves of the rib cages to be spread apart U.S. Pat. No. 5,025,779 to Bugge discloses a retractor which is designed to grip opposite sternum halves and spread the thoracic cavity apart. The large opening which is created by this technique enables the surgeon to directly visualize the surgical site and perform procedures on the affected organs. However, such procedures that involve large incisions and substantial displacement of the rib cage are often traumatic to the patient with significant attendant risks. The recovery period may be extended and is often painful. Furthermore, patients for whom coronary surgery is indicated may need to forego such surgery due to the risks involved with gaining access to the heart U.S. Pat. No. 5,503,617 to Jako discloses a retractor configured to be held by the surgeon for use in vascular or cardiac surgery to retract and hold ribs apart to allow access to the heart or a lung through an operating window. The retractor includes a rigid frame and a translation frame slidably connected to the rigid frame. Lower and upper blades are rotatably mounted to the rigid frame and the translation frame respectively.[0005]
• Once access to the thoracic cavity has been achieved, surgery on the heart may be performed. Such procedures typically require that the heart beat be arrested while maintaining circulation throughout the rest of the body. Cardioplegic fluid, such as potassium chloride (KCl) is delivered to the blood vessels of the heart to paralyze the myocardium. As disclosed in WO 95/15715 to Sterman et al. for example, cardioplegic fluid is infused into the myocardium through the coronary arteries by a catheter inserted into the ascending aorta. Alternatively, cardioplegic fluid is infused through the coronary veins in a retrograde manner by a catheter positioned in the interior jugular vein accessed at the patient's neck. Such procedures require the introduction of multiple catheters into the blood vessels adjacent the heart, which is a complicated procedure requiring that the desired vessels be properly located and accessed. The progression of the guide wires and catheters must be closely monitored to determine proper placement Furthermore, the introduction of catheters forms punctures in the blood vessels that must be subsequently closed, and there is an increased risk of trauma to the interior walls of the vessels in which the catheters must pass.[0006]
• Therefore, a need exists for an apparatus and procedure which provides access to the thoracic cavity without causing extensive trauma to the patient. A procedure is needed to at least locally stabilize a predetermined area of the heart surface that is relatively simple to perform and incorporates instruments that are simple and reliable. Furthermore, an apparatus and procedure is needed which provides a stable framework for supporting additional instruments which may be used during these procedures.[0007]
SUMMARY
• The present disclosure is directed to instruments for and methods of surgery. A retractor is provided which has a substantially planar base defining an opening for overlying an operative site on a patient, and at least one retractor blade slidably mounted to the base.[0008]
• The base is positioned on the patient such that the opening therein overlies the operative site, and the operative site is percutaneously accessed through the opening. Obstructing tissue is retracted with one or more retractor blades to create an opening to provide access for the surgical procedure. A surgical instrument is provided which is engageable with the base and operable at the operative site. A surgical procedure is carried out through the opening in the base with the surgical instrument.[0009]
• In a preferred embodiment, the retractor blade includes a ratchet assembly, and the method includes fixing the position of the retractor blade with respect to the base with the ratchet assembly.[0010]
• The retractor blade may also include an integral blowing, irrigation or suction assembly operably positioned adjacent the blade to remove blood, fluid, etc. In another embodiment, a light assembly may be incorporated to illuminate designated portions of the surgical field.[0011]
• A heart manipulator is disclosed for use in conjunction with the retractor and is releasably mountable on the base. The heart manipulator assists in atraumatically holding and positioning the heart to facilitate access thereto. In a preferred embodiment the heart manipulator includes a loop shaped frame which supports a mesh cradle.[0012]
• A heart stabilizer instrument is also disclosed. This instrument is preferably configured to be mounted to the base portion and has a heart contacting surface. The heart may be contacted with the heart contacting surface to stabilize the position of a predetermined portion of the heart surface. A heart stabilizer instrument may be provided which is mounted to the base portion and movable with respect thereto. The predetermined portion of the heart surface is substantially stabilized by applying pressure thereto. In a preferred embodiment, the heart stabilizer instrument includes structure configured to compress the coronary artery, and the step of stabilizing a predetermined portion of the heart surface includes applying pressure to the coronary artery with the heart stabilizer instrument The position of the heart stabilizing device may be locked with respect to the base.[0013]
• The base may be provided to the hospital and/or surgeon in a kit form including one or more retractors. The kit may also advantageously include a heart manipulator and/or heart stabilizing device.[0014]
• The surgical method may further include providing an actuator associated with the retractor blade and configured to effect linear movement of the retractor blade.[0015]
• These and other features of the surgical retractor and method for heart surgery will become more readily apparent to those skilled in the art from the following detailed description of preferred embodiments of the subject disclosure.[0016]
BRIEF DESCRIPTION OF THE DRAWINGS
• Various embodiments of the subject surgical apparatus are described herein with reference to the drawings wherein:[0017]
• FIG. 1 is a perspective view of a surgical retractor constructed in accordance with a first embodiment of the subject disclosure;[0018]
• FIG. 2 is an enlarged perspective view with parts separated of a retractor blade assembly of the surgical retractor of FIG. 1;[0019]
• FIG. 3 is an enlarged cross-sectional view of a portion of the retractor blade assembly, illustrating the mounting of the retractor blade assembly on the base;[0020]
• FIG. 4 is an enlarged cross-sectional view taken along line[0021]4-4 of FIG. 1 of the retractor blade assembly mounted to the base;
• FIG. 5 is an enlarged top view, illustrating the radially inward movement of the retractor blade with respect to the base;[0022]
• FIG. 6 is an enlarged top view, illustrating the ratchet on the retractor blade in engagement with the pawl member associated with the base;[0023]
• FIG. 7 is an enlarged top view, illustrating the pawl member associated with the base moved out of engagement with the retractor blade assembly;[0024]
• FIG. 8 is a perspective view of one embodiment of a heart manipulator mounted to a base;[0025]
• FIG. 9 is a perspective view of a heart manipulator mounted to the base and constructed in accordance with another embodiment;[0026]
• FIG. 10 is an enlarged perspective view of a heart stabilizer instrument mounted to the base;[0027]
• FIG. 11 is a top view in reduced scale of the base portion positioned on the patient's chest;[0028]
• FIG. 12 is a top view, illustrating retractor blade assemblies mounted to the base portion and retracting the patient's ribs;[0029]
• FIG. 13 is a top view, illustrating a heart manipulator in position adjacent the patient's heart;[0030]
• FIG. 14 is an enlarged side view in cross-section, illustrating a heart manipulator mounted to the base and spaced from the heart;[0031]
• FIG. 15 is an enlarged side view in cross-section, illustrating a heart manipulator in contact with the heart;[0032]
• FIG. 16 is a top view, illustrating the heart stabilizer instrument of FIG. 10 mounted to the base;[0033]
• FIG. 17 is a perspective view of the heart stabilizer instrument of FIG. 10 mounted to the base and spaced from the heart;[0034]
• FIG. 18 is a perspective view of the heart stabilizer instrument of FIG. 10 in contact with the heart;[0035]
• FIG. 19 is a perspective view of a surgical retractor assembly and base constructed in accordance with another embodiment of the subject disclosure;[0036]
• FIG. 20 is an enlarged perspective view with parts separated of the retractor blade assembly,[0037]
• FIG. 21 is an enlarged perspective view from below of the retraction knob, illustrating the pinion gearing disposed thereon;[0038]
• FIG. 22 is an enlarged cross-sectional view of the retractor blade assembly mounted to the base;[0039]
• FIG. 23 is an enlarged cross-sectional view of the retractor blade assembly in the process of being mounted to the base;[0040]
• FIG. 24 is an enlarged top view illustrating the radially outward translation of the retractor blade;[0041]
• FIG. 25 is an enlarged top view of the pawl member associated with the base in engagement with the retractor blade;[0042]
• FIG. 26 is an enlarged top view, illustrating the pawl member moved out of engagement with the retractor blade;[0043]
• FIG. 27 is a perspective view of a heart manipulator constructed in accordance with yet another embodiment of the subject disclosure;[0044]
• FIG. 28 is an enlarged cross-sectional view of the mounting assembly for the heart manipulator of FIG. 27;[0045]
• FIG. 29 is a perspective view of a heart stabilizer instrument constructed in accordance with another embodiment of the subject disclosure;[0046]
• FIG. 30 is an enlarged cross-sectional view of the mounting assembly of the heart stabilizer instrument of FIG. 29 in an unlocked position;[0047]
• FIG. 31 is an enlarged cross-sectional view of the mounting assembly of the heart stabilizer instrument of FIG. 29 in a locked position;[0048]
• FIG. 32 is a cross-sectional view taken along line[0049]32-32 of FIG. 31 illustrating the mounting assembly;
• FIG. 33 is a top view of the surgical retractor positioned on the patient's chest, illustrating retractor blade assemblies, a heart manipulator and a heart stabilizer instrument mounted to the base;[0050]
• FIG. 34 is a perspective view of a surgical retractor constructed in accordance with another embodiment of the subject disclosure;[0051]
• FIG. 35 is a perspective view with parts separated of a retractor blade assembly of the surgical retractor of FIG. 34;[0052]
• FIG. 36 is an enlarged side cross-sectional view of the retractor blade assembly, illustrating the positioning adjacent a rib and the mounting of the retractor blade assembly on the base;[0053]
• FIG. 37 is an enlarged side cross-sectional view of the retractor blade assembly mounted to the base and in the process of retracting a rib;[0054]
• FIG. 38 is a perspective view, illustrating the pawl member and the retractor blade in engagement;[0055]
• FIG. 39 is an enlarged cross-sectional view taken along line[0056]39-39 of FIG. 37, illustrating the ratchet on the retractor blade in engagement with the pawl member,
• FIG. 40 is an enlarged cross-sectional view, illustrating the pawl member associated with the base moved out of engagement with the retractor blade;[0057]
• FIG. 41 is a perspective view of another embodiment of a heart stabilizer instrument mounted to the base of FIG. 34;[0058]
• FIG. 42 is a perspective view with parts separated of the heart stabilizer instrument of FIG. 41;[0059]
• FIG. 42A is a perspective view of the toggle member, illustrating the cable mounting configuration;[0060]
• FIG. 42B is a perspective view from below of the heart stabilizer instrument of FIG. 41;[0061]
• FIG. 43 is a side cross-sectional view of the heart stabilizer instrument of FIG. 41;[0062]
• FIG. 44 is a side view in partial cross-section of the heart stabilizer instrument in an unlocked configuration;[0063]
• FIG. 45 is an enlarged cross-sectional view of the toggle mechanism in an unlocked configuration;[0064]
• FIG. 46 is an enlarged cross-sectional view of a portion of the articulating arm, illustrating the cable in a loose configuration corresponding to the unlocked configuration of FIGS. 44-45;[0065]
• FIG. 47 is an enlarged cross-sectional view of the toggle mechanism in an locked configuration;[0066]
• FIG. 48 is a reduced scale side view in partial cross-section of the heart stabilizer instrument in an locked configuration;[0067]
• FIG. 49 is an enlarged cross-sectional view of a portion of the articulating arm, illustrating the cable in a tightened configuration corresponding to the locked configuration of FIGS. 47-48;[0068]
• FIG. 50 is an perspective view of a heart stabilizer instrument mounted to the base in accordance with another embodiment of the present disclosure;[0069]
• FIG. 50A is an enlarged perspective view of the link members of the heart stabilizer instrument of FIG. 50;[0070]
• FIG. 50B is an enlarged perspective view of the link members of the heart stabilizer instrument of FIG. 50;[0071]
• FIG. 51 is a perspective view of a surgical retraction system in accordance with another embodiment of the subject disclosure incorporating a variety of retractors, a heart manipulator and a heart stabilizer, all positioned on a base;[0072]
• FIG. 52 is a top view of the base of FIG. 51 illustrating suture mounts positioned thereabout;[0073]
• FIG. 53 is an enlarged perspective view of the suture mounts of FIG. 52;[0074]
• FIG. 54 is a perspective view of a surgical retractor in accordance with the subject disclosure incorporating an integral blowing structure;[0075]
• FIG. 55 is a reverse perspective view of the surgical retractor of FIG. 54;[0076]
• FIG. 56 is an enlarged perspective view with parts separated of the surgical retractor of FIG. 54;[0077]
• FIG. 57 is a perspective view of a surgical retractor in accordance with the subject disclosure incorporating a light;[0078]
• FIG. 58 is a reverse perspective view of the surgical retractor of FIG. 57;[0079]
• FIG. 58A is a top plan view in partial cross-section of a surgical retractor mounted to the base of FIG. 52;[0080]
• FIG. 58B is a top plan view in partial cross-section of the surgical retractor in FIG. 58A pulled proximally relative to the base;[0081]
• FIG. 58C is a top plan view in partial cross-section of the surgical retractor in FIG. 58A released from engagement with the rack;[0082]
• FIG. 59 is a perspective view of another embodiment of a heart stabilizer instrument in accordance with the subject disclosure;[0083]
• FIG. 60 is an enlarged perspective view of a portion of the heart stabilizer instrument of FIG. 59, illustrating a positioning flange formed thereon;[0084]
• FIG. 61 is a perspective view with parts separated of the heart stabilizer instrument of FIG. 59;[0085]
• FIG. 62 is a perspective view of the mounting flange member of the heart stabilizer instrument of FIG. 59;[0086]
• FIG. 63 is a perspective view of the movable handle of the heart stabilizer instrument of FIG. 59;[0087]
• FIG. 64 is a top plan view in partial cross-section of the heart stabilizer instrument of FIG. 59 with the movable handle in the unlocked unstressed position;[0088]
• FIG. 65 is a cross-sectional view taken along line[0089]65-65 of FIG. 64, illustrating the relative position of the handle spring member,
• FIG. 66 is a top plan view in partial cross-section of the heart stabilizer instrument of FIG. 59 with the movable handle in the locked unstressed position;[0090]
• FIG. 67 is a cross-sectional view taken along line[0091]67-67 of FIG. 66, illustrating the relative position of the handle spring member,
• FIG. 68 is a top plan view in partial cross-section of the heart stabilizer instrument of FIG. 59 with the movable handle in the locked and stressed position;[0092]
• FIG. 69 is a cross-sectional view taken along line[0093]69-69 of FIG. 68, illustrating the relative position of the handle spring member,
• FIG. 70 is a perspective view of another embodiment of a heart manipulator,[0094]
• FIGS. 71A and 71B are front and back perspective views of the rib elevator,[0095]
• FIG. 72 is a perspective view of a kit assembly having a base, three retractors, a retraction knob, a heart manipulator and a heart stabilizer instrument; and[0096]
• FIG. 73 is a perspective view of a kit assembly having a base, a retraction knob and three retractors.[0097]
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
• The preferred embodiments of the apparatus disclosed herein will be discussed in terms of procedures and apparatus for heart surgery. However, the subject disclosure should not be limited to an apparatus for use in conjunction with such heart surgery, but may find application in surgery wherein access to the surgical site is achieved through a small incision and retraction of the surrounding tissues and/or bone is desired.[0098]
• Referring now in detail to the drawings in which like reference numerals identify similar or identical elements, a first embodiment of the surgical retractor of the subject disclosure is illustrated in FIG. 1, and is designated generally by[0099]reference numeral10.Surgical retractor10 hasbase12 andretractor blade assembly14, including mountingassembly16 andretractor blade18. As will be described below,base12 in this embodiment is configured to be placed on the chest of a patient surrounding an incision.Retractor blade18 includeshook20 configured for atraumatically engaging a rib.Strap22 assists the surgeon in drawing theretractor blade18 radially outward and retracting a rib therewith. One-way ratchet assembly23 on mountingassembly16 retainsretractor blade18 in position.Base12 is also configured to receive surgical instruments for mounting thereon, as will be described below.
• [0100]Base12 preferably has a closed shape, such as an oval configuration as shown, or a circle, polygon, or the like.Base12 is sized sufficiently large in order to enclose sufficient area to provide access to the operative site. The bottom portion ofbase12 is preferably configured to permit placement directly on the skin of the patient with the base substantially flush with the patient's skin. Suture mounts24a,24b,24cmay be provided at several locations on the base12 to permit suture tie down of internal tissue structures such as the pericardial sac.Outer periphery26 ofbase12 includes a series of outwardly extendingteeth27 formed thereon to provide additional stability to the positioning of mountingassembly16 and other instruments onbase12.Base12 also includes a beveledinner surface28 with aninner lip30, andtop surface32.Base12 has a low profile when placed on the body.Base12 is rigidly supported by pressure fromretractor blade assembly14 on the ribs in three or four locations. Preferably, three retractor blade assemblies are disposed onbase12 at 120° apart Retractor blade assemblies may be disposed 90° apart.
• Turning now to FIG. 2, mounting[0101]assembly16 permits quick and stable mounting of the retractor blade assembly tobase12. Mountingassembly16 includes mountingbracket34,retainer block36, andretainer spring38. Grippingflange40 on mountingbracket34 is configured to engageinner lip30 of base12 (FIGS. 3 and 4).Sleeve42 forms an open-sided channel44 for sliding reception ofretractor blade18.Pawl member46 is formed on mountingbracket34 and has a series of engagingteeth48 which communicate with the open side ofchannel44 for engagingretractor blade18, as will be described below. Mountingbracket34 defines acavity49 for mountingretainer block36 therein.Cavity49 is partially defined byouter retainer wall50 withupper flange51 and byinner wall52 havingaperture53.Retainer block36 is radially slidable withincavity49 and is biased inward byretainer spring38 such thatengagement teeth54 onretainer block36 protrude throughaperture53, to engageteeth27 provided onperiphery26 ofbase12.Retainer block36 also includes handle56 which permits the surgeon to moveretainer block36 towardsretainer wall50 against the bias ofretainer spring38, in order to disengageteeth54 frombase12.
• [0102]Retractor blade18 includescurved hook20 on a distal end portion andslot57 on a proximal end portion to receiveflexible assist strap22 therethrough. A series ofratchet teeth58 are provided on an edge ofretractor blade18 and engageteeth48 ofpawl member46 whenretractor blade18 is disposed inchannel44 of mountingbracket34.
• As illustrated in FIGS. 3-4, mounting[0103]assembly16 is mounted tobase12 in a simple, one-handed operation. FIG. 3 illustratesretainer block36 displaced towardsretainer wall50 against the normal bias ofretainer spring38. Handle56 ofretainer block36 facilitates approximation ofretainer wall50 withflange51 ofretainer wall50. Mountingassembly16 is lowered ontobase12 at an angle as shown such thatgripping flange40 engagesinner lip30 ofbase12.Engagement teeth54 are angled to permit camming overouter lip60. FIG. 4 illustrates mountingassembly16 into position with respect tobase12, upon whichretainer block36 is released, which thereby returns inward towardsbase12 under the normal bias ofspring38.Engagement teeth54 pass underouter lip60 and engageteeth27 onperiphery26 ofbase12.
• Turning to FIGS. 5-7, the progression of[0104]retractor blade18 with respect to mountingbracket34 is illustrated.Ratchet assembly23 includespawl46 on mountingbracket34 andteeth58 onretractor blade18.Pawl46 is normally biased towardsretractor blade18.Pawl teeth48 andretractor blade teeth58 are each configured with a sloping portion and a straight portion. This permitsretractor blade18 to be progressively displaced in a radially outward direction as indicated by arrow “O” in FIG. 5. As illustrated in FIG. 6, radially inward displacement ofretractor blade18 is prevented by engagement ofpawl teeth48 andretractor blade teeth58 under the normal bias ofpawl46. The arrangement of teeth, as shown in FIGS. 5-6 permits retraction of a rib or other body structure and prevents slipping of or loss of retraction force exerted byretractor18. As illustrated in FIG. 7,retractor blade18 is permitted to displace radially inward as indicated by arrow “I” whenpawl tab62 is rotated clockwise causing it to move away fromretractor blade18 against its normal bias by actuation oftab62. Unrestricted movement ofretractor blade18 is permitted in both radially inward and radially outward directions whentab62 is moved to the position of FIG. 7.
• FIG. 8 illustrates a[0105]heart manipulator64 for use in conjunction withsurgical retractor10 and for mounting onbase12.Heart manipulator64 includes loop shapedframe66 that supportsmesh surface68.Frame66 andmesh surface68 together form a heart contacting surface for manipulating the heart therewith. Preferably,frame66 includesupright portion70, generally horizontally extendingportion72 and atraumaticcurved end portion74, which provide a surface for engaging and manipulating the heart.Frame66 is supported by mountingbar76 which is slidably received insupport bracket78 for height adjustment. Setscrew80 secures mountingbar76 with respect to supportbracket78. Radial positioning ofsupport bracket78 andheart manipulator64 is achieved by slidable mounting ofsupport bracket78 on mountingassembly82 which mounts tobase12 in a manner substantially similar to that of mountingassembly16 described above with respect to FIG. 3-4. Setscrew84 secures the radial position ofheart manipulator64 with respect to mountingassembly82. More particularly,support bracket78 has an elongatedslot79 formed therein which enablesbracket78 to slide radially with respect to setscrew84 and mountingassembly82. As shown in FIG. 14, mountingassembly82, like mountingassembly16, has a mountingbracket83 which engagesinner lip30 ofbase12,retainer block81, andretainer spring87. Handle89 ofretainer block81 enables the engagement and disengagement of mountingassembly82 in the same manner as mountingassembly16 described above.
• Turning to FIG. 9, a[0106]heart manipulator90 is shown in accordance with another preferred embodiment.Loop frame66 and mountingassembly82 are substantially as described above with respect toheart manipulator64 in FIG. 8. Mountingbar92supports frame66 and has a substantially rightangled bend94 for slidable insertion insupport bracket96. Radial position ofheart manipulator90 is achieved by sliding mountingbar92 with respect to supportbracket96 and secured thereto byset screw98. Although height adjustment ofheart manipulator90 is not provided, access to the operative site is enhanced by the one-piece design of mountingbar92.
• FIG. 10 illustrates a[0107]heart stabilizer instrument100, configured to apply pressure to the coronary artery to reduce blood flow in the artery to allow anastomosis to the coronary artery and to reduce movement of the heart muscle betweenlegs104a,104bin order to enable the surgeon to perform cardiovascular surgery.Heart stabilizer instrument100 is mounted tobase12 by mountingassembly82, substantially as described above.Heart stabilizer instrument100 includesframe102 supportinglegs104aand104bandtransverse bars106aand106b. Protrusion108ais formed on transverse bar106a, andprotrusion108bis formed ontransverse bar106b.Protrusions108aand108bhave an atraumatic convex heart contacting surface and permit the exertion of localized pressure on the coronary artery whenframe102 is compressed on the surface of the heart. Mountingbar110 is slidably received insupport bracket78 and secured with respect thereto byset screw80. Radial positioning ofheart stabilizer instrument100 with respect to mountingassembly82 is secured by a coupling means, such asset screw84.
• Turning now to FIG. 11, the operation of the[0108]surgical retractor10 will now be described. Conventional surgical techniques are used to determine the location of the incision I accessing the chestcavity C. Base12 is placed on the chest of the patient with the opening overlying the operative site. Incision I is made, exposing several ribs R₁, R₂, and R₃.
• As illustrated in FIG. 12,[0109]retractor assemblies14a,14b, and14care mounted to base12 at various locations.Hook20ais positioned around a rib R₁. Assist strap22ais used to provide a grip for the surgeon to deflect and retract rib R₁by pullingretractor blade18 radially outward. Oneway ratchet assembly23amaintainsretractor blade18 and consequently rib R₁in position. Rib R₂is retracted in a substantially identical manner by hook20bon retractor assembly14b. Additional retractors are mounted and used to retract ribs until a sufficiently large opening O in chest cavity C is defined in order to provide access to the heart. Although three retractors are shown, it is contemplated that a fewer number or a grater number of retractors could be utilized, and these retractors can be mounted anywhere alongbase12 in order to perform their function. For example, the sternum and the fourth and fifth ribs can be spread apart to create a window. Alternatively, the fourth and fifth ribs are cut from the sternum and spread to create a larger window. Alternatively, a fifth rib can be cut, and the sternum and the fourth and sixth ribs are spread.
• [0110]Base12 is at least partially held in position over the operative site by tension created in retracting the ribs byretractor blades18. Internal tissue structures may be tied down utilizing sutures passing throughsecurement points24a,24b,24cand24d.
• Turning now to FIG. 13,[0111]heart manipulator64 is mounted tobase12 in order to manipulate the position of heart H to facilitate the surgery. With reference to FIG. 14,heart manipulator64 is positioned in the chest cavity adjacentheart H. Frame66 and mountingbar76 can be lowered and fixed byset screw80 such thathorizontal portion72 andcurved end portion74 are positioned slightly underneath heart H. As illustrated in FIG. 15,heart manipulator64 is displaced radially inward and against heart H by loosening setscrew84 and sliding mountingbar92 in the direction of the arrow. When sufficient pressure is placed on the heart to substantially fix its position,heart manipulator64 is secured by the tightening ofset screw84.
• With the heart manipulated to the desired position, FIG. 16 illustrates the mounting of[0112]heart stabilizer instrument100 tobase12. As illustrated in FIG. 17,heart stabilizer instrument100 is positioned over heart H and more particularly, over coronary artery A. The radial positioning ofinstrument110 is accomplished by relative movement ofsupport bracket78 with respect to mountingassembly82.
• As illustrated in FIG. 18,[0113]frame102 and mountingbar110 are lowered with respect to supportbracket78 such thatframe102 applies direct pressure onheart H. Protrusions108aand108blocalize this pressure to substantially restrict the flow of blood from coronary artery A and104aand104breduce movement of the surface of the heart muscle to facilitate the surgery. Heart movement is restricted by virtue of the leg pressure and the anti-slip texture of thelegs104aand104b. The position ofinstrument100 may be locked with respect to the base as set forth in detail below.
• Turning now to FIGS. 19-33, another preferred embodiment of the surgical retractor is disclosed at reference numeral[0114]200. Instrument200 operates substantially as described above with regard toinstrument10, with the differences described hereinbelow. In particular, FIG. 19 illustrates surgical retractor200 havingbase212 andretractor blade assembly214, which includes mountingbracket216,retractor blade218 andretraction knob220. The provision ofretraction knob220 enables the surgeon to achieve additional mechanical advantage in retracting a rib.
• [0115]Base212 includessuture mounting portions224a,224b,224cand224dfor securingbase212 adjacent the surgical site.Base212 further includes beveledinner surface228 withinner lip230 andtop surface232 in which a series of cylindrical recesses oropenings240 are defined.
• As illustrated in FIG. 20, mounting[0116]bracket216 includessleeve242 defining open-sided channel244 for sliding reception ofretractor blade218.Pawl member246 has a series ofratchet teeth248 configured to engage ratchetteeth258 onretractor blade218 whenblade218 is slidably inserted inchannel244.
• [0117]Retraction knob220 is rotatably positioned inaperture236 in mountingbracket216. With reference to FIG. 20 in conjunction with FIG. 21,retraction knob220 includespinion gear260 which cooperates withrack262 provided onretractor blade218. As will be described below, rotation ofknob220 provides additional mechanical advantage in cooperation with one-way ratchet mechanism23 to retract and/oradvance retractor blade218.
• As illustrated in FIGS. 22-23,[0118]retractor blade assembly214 is mounted tobase212 in a simple, one-handed motion. Mountingbracket216 includespin264 on a bottom portion thereof dimensioned to be received in one ofcylindrical recesses240 inbase portion212. The length ofpin264 is preferably substantially equivalent to the depth ofrecess240 to provide stability to mountingbracket216. In addition, wedge shapedinner portion266 of mountingbracket216 cooperates with beveledinner surface228 ofbase212 to facilitate positioning and to provide resistance against tilting ofretractor blade218. Mountingbracket216 is further secured in position bytab270 which includes aflange272 which engagesouter rim274 ofbase212. As illustrated in FIG. 23, removal and placement of mountingbracket216 is accomplished by deflectingflange272 oftab270 clear ofouter rim274.Tab220 includesrigid lever arm276 which facilitates such deflection oftab270.
• Turning to FIGS. 24-26, the interaction of[0119]retractor blade218 with respect to mountingbracket216 is illustrated.Ratchet assembly223, which includespawl246 andsloping teeth258 function substantially as described above with respect to FIG. 5, and permitsretractor blade218 to be progressively displaced radially outwardly while preventing radially inward displacement Initially, assist straps22 (See, FIG. 19) are used by the surgeon to retract a rib. Retractingblade218 is displaced radially outwardly as far as possible given the strength of the surgeon. Subsequently, additional retraction force can be applied to the rib by rotation ofretraction knob220.Pinion gear260 disposed onknob220 engagesrack262 onretraction blade218 and provides additional leverage to the surgeon. As illustrated in FIG. 25,pawl246 is normally biased againstretraction blade218 such that ratchetteeth258 onblade218 and ratchetteeth248 onpawl246 engage to prevent radially inward movement. It should be appreciated thatknob220 is optionally removable so it can be used to retract eachretractor blade218.
• FIG. 26 illustrates that[0120]pawl246 may be rotated away fromretraction blade218 by pivotinglever262 to disengageteeth258 and248. Unrestricted radial movement ofretraction blade218 is facilitated thereby.
• FIGS. 27-28 illustrated another embodiment of a heart manipulator instrument designated by[0121]reference numeral300.Heart manipulator300 is used to manipulate the position of the heart and operates substantially as described above with regard toheart manipulator64, with the differences described below. In particular,heart manipulator300 includesframe member302, formed in a modified “U” configuration having an upright portion wherein the bars are parallel, including closely spaced mountingportions304aand304b, more widely spacedmesh supporting portions306aand306b, and a curved horizontally extendingportion308.Mesh supporting portions306aand306band horizontally extendingportion308 support amesh surface310 therebetween. Mountingportions304aand304bare snap fit within bores formed insupport bracket320. It is contemplated thatmembers304aand304bmay be slidable with respect tobracket320 and secured with set screws (not shown). Radial positioning ofsupport bracket320 is achieved by slidable mounting ofsupport bracket320 on mountingbracket322. Setscrew324 is used to secure the radial positioning ofheart manipulator300.Elongated slot330 allows movement ofsupport bracket320 with respect to set screw-324 and mountingbracket322.
• Turning now to FIG. 28, mounting[0122]bracket322 is configured to mount onbase212 substantially as described with respect to mountingbracket216 in FIGS. 22-23.Pin364 ofbracket322 is received in one ofopenings240 inbase212.Tab370 includesflange372 which removably engagesouter rim274 ofbase212 and is disengaged bylever arm376.Support bracket320 is slidably mounted on mountingbracket322 such that a portion ofslot330 is aligned over threadedbore332. Setscrew324 extends throughslot330 intobore332 and includescollar334 which abuts a top surface ofsupport bracket320 to secure it against radial movement.
• FIGS. 29-32 illustrate a[0123]heart stabilizer instrument350 in accordance with another preferred embodiment of the subject disclosure. With reference to FIG. 29,heart stabilizer instrument350 includesframe102 and mountingbar110.Frame102 includeslegs104aand104bandtransverse bars106aand106bhavingprotrusions108aand108bsubstantially as described with respect to FIG. 10, above. Mountingbar110 is slidably received in a bore insupport bracket352 and secured with respect thereto byset screw354.Support bracket352 is slidable with respect to mountingbracket356.
• As illustrated in FIGS. 30-31, mounting[0124]bracket356 is removably mounted onbase portion212 substantially as described with respect to mountingbracket216 in FIGS. 22-23.Pin358 is received in one of cylindrical recesses oropenings240 inbase212.Tab360 includesflange362 for removably engagingouter rim274 ofbore212.Flange362 is disengaged by actuation oflever arm364. With reference to FIG. 32 in conjunction with FIGS. 30-31,support bracket352 includes a pair ofvertical walls364aand364band a pair ofhorizontal walls366aand366bwhich rest on a top surface of mountingbracket356. Alever mounting rod368 extends upwardly from mountingbracket356 betweenhorizontal walls366aand366b. A pair of hinge pins370aand370bextend fromrod368 and are received in aclevis portion372 oflever arm374.Horizontal walls366a,366bofsupport bracket352 are disposed between mountingbracket356 and clevisportion372 oflever arm374.
• With continued reference to FIGS. 30-31, clevis[0125]portion372 is substantially circular or elliptical in lateral cross-section and is eccentrically mounted to hingepins370aand370b. As illustrated in FIG. 30, whenlever arm374 is in a released position, clevisportion372 is spaced fromhorizontal walls366aand366band unrestricted radial movement ofsupport bracket352 is enabled thereby. As illustrated in FIG. 31, pivoting oflever arm374 causesclevis portion372 to apply a compressive force onhorizontal walls366aand366bon top of mountingbracket356 to thereby fix the radial position ofsupport bracket352 with respect to mountingbracket356.
• Turning to FIG. 33, operation of surgical retractor[0126]200 in conjunction with heart manipulator and heart stabilizer instrument proceeds substantially as described with respect to FIGS. 11-18. As noted above, mounting bracket216aofretractor blade assembly214 is placed onbase212 by actuation of lever arm276a(not shown). Heart manipulator200 andheart stabilizer instrument350 are mounted tobase212 in a substantially identical manner as described above. The surgical procedure is carried out substantially as described above. Ribs R₁, R₂and R₃are retracted by the pulling of assist straps22 and by the rotation ofretraction knob220. The position of heart H is stabilized byheart manipulator300.Heart stabilizer instrument350 is positioned and lowered onto heart H to apply pressure to the coronary artery and thereby substantially reduce movement (motion) of the heart within the legs. Theinstrument350 may be locked with respect to the base. At this time, other surgical procedures, such as coronary bypass or valve surgery may be performed.
• Turning now to FIGS. 34-52, another embodiment of the surgical retractor is disclosed at[0127]reference numeral400.Instrument400 operates substantially as described with regard to instrument200, with the differences noted hereinbelow. In particular, FIG. 34 illustratessurgical retractor400 havingbase412 andretractor blade assembly414, which includes mountingbracket416,retractor blade418, andretraction knob420. The provision ofretraction knob420 enables the surgeon to achieve additional mechanical advantage in retracting a rib.
• [0128]Base412 includessuture mounting portions424 for suture tie down of internal tissue structures.Base412 further includes beveledinner surface428 with inner lip orrim430 andtop surface432, which forms an outer lip orrim434. A channel or groove436 is formed intop surface432.Outer periphery438 ofbase412 includes a series ofteeth440 formed thereon.
• As illustrated in FIG. 35, mounting[0129]bracket416 includeshousing442 and mountingplate444 which are connected and allowretractor blade418 to slide withinchannel446 defined in a lower surface ofhousing442.
• [0130]Retractor blade418 includesbody portion448 andrib engaging portion450.Body portion448 defines aT handle452 configured to be grasped by the surgeon in order to slideretractor blade418 withinchannel446.Body portion448 defines arack gearing454 and a series ofsloping ratchet teeth456. Preferably,such gearing454 and ratchetteeth456 are respectively disposed alongelongated channel458 defined withinbody portion448.
• [0131]Ratchet teeth456 are releasably engaged bypawl460. Mountingplate444 definesfirst channel462 andsecond channel464 for receivingpawl460. Preferably,pawl460 is a resilient member having a modified U-shaped configuration includingcrown portion466,first leg468 defining cut-outportion470, andsecond leg472.Second leg472 is fixedly retained withinsecond channel464 having an elbow configuration. The junction ofsecond leg472 andcrown466 acts as a hinge or pivot such thatfirst leg468 is slidable withinfirst channel462.Pawl460 is normally biased at this junction ofsecond leg472 andcrown466 such thatfirst leg468 is partially disposed infirst channel462.Crown466 may be pressed by the user towards mountingplate444 against the normal bias to slidefirst leg468 further alongfirst channel462.Retractor blade418 is positioned adjacent mountingplate444, andpawl460 is placed on top ofblade418 such that cut-outportion470 offirst leg468 straddles a portion ofblade418adjacent ratchet teeth456. (See, FIG. 38) As will be described below,pawl460 is normally biased such thatfirst leg468 is in engagement with one ofratchet teeth456.Pawl460 and ratchetteeth456 together define a one-way ratchet mechanism474.
• [0132]Rack gearing454 is engaged by pinion gearing476 formed onretraction knob420, which is positioned inaperture478 defined inhousing442. As will be described below, rotation ofretraction knob420 provides additional mechanical advantage when used in cooperation withratchet mechanism474 to retract and/oradvance retractor blade418.
• [0133]Rib engaging portion450 is connected tobody portion448 with a dovetail joint and secured thereto with pins480aand480b. Alternatively,retractor blade418 may be constructed of a single partRib engaging portion450 includes ahorizontal portion482, angularly dependingportion484, andtip portion486.Angularly depending portion484 forms an acute angle withhorizontal portion482 to securely engage the rib. Strengthening rib orbeading488 is formed on the outside ofrib engaging portion450 to provide additional strength and to resist bending.
• Referring to FIG. 35 in conjunction with FIGS. 36-37, mounting[0134]plate444 includes agearing490 on a forward portion thereof to engageperipheral gear teeth440 on base412 (See, FIG. 34).
• As illustrated in FIG. 36,[0135]base412 is placed at the operative site on patient's chest.Rib engaging portion450 is positioned adjacent rib R, such thatangularly depending portion484 andtip portion486 at least partially surroundrib R. Housing442 has a flat bottom portion and is placed onupper surface432 ofbase412.
• FIG. 37 illustrates the simultaneous mounting of mounting[0136]bracket416 tobase412 and retraction of rib R towardsbase412 as indicated by the arrows.Retractor blade418 is moved radially outward with respect tobase412 whilerib engaging portion450 engages ribR Mounting plate444 is spaced from the bottom portion ofhousing442 in order to permit mountingplate444 to slide underouter rim434 ofbase412, and to allowteeth490 engageteeth440 onbase412. Mountingbracket416 is secured onbase412 by the compression force created betweenrib engaging portion450 against rib R and mountingplate444 againstouter rim434 ofbase412. Removal ofretractor blade418 from rib R occurs by slidingretractor blade418 radially inward, thereby releasing compression sufficiently to allow mountingplate444 to be released fromouter rim434.
• One-[0137]way ratchet mechanism474 enablesretractor blade418 to be incrementally moved in one direction, i.e. radially outwardly to retract a rib, while resisting movement in an opposite direction, i.e. radially inward. FIG. 38 illustratespawl460 normally biased such thatfirst leg456 is in engagement withratchet teeth456. As shown in FIG. 39, slopingportions490 ofteeth456permit retractor blade418 to incrementally move in a radially outward motion while transverse slopes492 ofteeth456 inhibit radially inward motion to holdretractor blade418 and the rib in position. As described above with respect to retractor200, additional retraction force can be applied to the rib by rotation ofretraction knob420.Pinion gear476 disposed onretraction knob420 engagesrack454 onretraction blade418 to provide additional leverage to the surgeon. After retracting the rib to create sufficient access for the surgeon,rotation knob420 may be removed fromaperture478 in housing442 (See, FIG. 35) and thereby provide greater visibility and access for the surgeon.
• [0138]Pawl460 may be moved against its normal bias by depressingcrown466 towards mountingplate444, which causesfirst leg468 to disengage from ratchetteeth456 as shown in FIG. 40. Cut-out portion470 as aligned such thatblade418 may slide therethrough, such that unrestricted radial movement ofretraction blade418 is enabled.
• FIGS. 41-49 illustrate a[0139]heart stabilizer instrument500 in accordance with another preferred embodiment of the subject disclosure. With reference to FIG. 41,heart stabilizer instrument500 includesframe502, articulatingarm504, and mountingassembly506. Articulatingarm504 is configured to allowframe502 to be positioned at the precise location and orientation with respect to the heart of thepatient Mounting assembly506 secures articulatingarm504 andframe502 in a fixed configuration, as will be described below.
• [0140]Frame502 is configured to contact the heart and applies pressure to the heart without touching the coronary artery.Frame502 includes a pair oflegs508aand508b, each havingteeth510 for atraumatically contacting the heart.Frame502 is mounted to framemount512 bypin514. The distal end ofcable516 is mounted to frame502, and passes intoframe mount512 atopening513.
• [0141]Articulation arm504 consists of a plurality oflink members518a,518b,518c,518d, each of which has hemispherical convexdistal portion520,cylindrical body portion522 includingperipheral step523, and concaveproximal end524.Bore526 extends longitudinally through eachlink518 from convexdistal portion520 to concaveproximal end524.Link members518 are aligned such that convexdistal portion520 is received in concaveproximal end524 in a ball-and-socket type connection to permit a wide range of pivoting motion between adjoininglink members518.Link members518 are concatenated bycable516 passing through eachbore526, and thedistalmost link member518ais fittedadjacent frame mount512.Articulation arm504 can be used to mount a light cable to illuminate the surgical site, a suction and/or irrigation device, a blowing device to disperse blood or any other instrument to facilitate the surgery:
• Mounting[0142]assembly506 is mounted adjacentproximalmost link member518dand includes mountingflange member530, mountingbase532, togglehousing534, andtoggle536. As shown in FIG. 42B, mountingbase532 has aflat bottom surface538 to rest ontop surface432 ofbase412 and a protrusion or peg540 configured and dimensioned to be received inflange436 ofbase412. With continued reference to FIG. 42, mountingflange member530 and togglehousing534 are slidably mounted with respect to mountingbase532 and are normally biased in a spaced-apart configuration from mountingbase532 bysprings542 and544, respectively. Mountingflange member530 hasflange546 for engaginginner rim430 ofbase412.Toggle housing534 hasflange548 for engagingouter rim434 ofbase412.
• [0143]Toggle536 includes cylindrical mountingportion550 and togglearm552. Cylindrical mountingportion550 is configured to be received withincylindrical recess554 defined withintoggle housing534 and to be pivotably movable therein.Cable516 extends throughlink members518 and through mountingflange member530,spring542, mountingbase532,spring544, and intocylindrical recess554 oftoggle housing534. The distal end portion ofcable516 is pinned to toggle536 bypin556. As illustrated in FIG. 42A, cylindrical mountingportion550 defines a laterally offset pie-shaped or arc-section recess558 to define an “over-center” type locking mechanism, as will be described below.
• As illustrated in FIG. 43,[0144]heart stabilizer instrument500 is configured such thatcable516 extends throughinstrument500 fromframe502 to toggle536.Bore526 in eachlink member518 has a tapering diameter which is larger adjacent convexdistal portion520 and is narrower adjacent concaveproximal portion524. This configuration permits relative articulation oflink members518 whilecable516 extends therethrough.
• FIGS. 44-46, illustrate[0145]heart stabilizer instrument500 withcable516 in a relaxed unstressed configuration. As illustrated in FIG. 44,instrument500 is placed onbase412 such that peg540 is disposed ingroove436, and mountingflange member530 and togglehousing534 are spaced apart sufficiently to allowflanges546 and548 to clearinner rim430 andouter rim434, respectively.
• As illustrated in FIG. 45,[0146]toggle536 is disposed intoggle housing534 in an unlocked configuration, such thattoggle arm552 and fixedarm535 are spaced apart. Eccentrically mountedpin556 is disposed such thatcable516 is loose. FIG. 46 illustrates thatcable516 loosely disposed in taperedbores526 oflink member518 permit articulation of adjoininglink members518.
• FIGS. 47-49 illustrate[0147]instrument500 withcable516 in a taut, stressed configuration. As depicted in FIG. 47,toggle536 is pivoted with respect to togglehousing534 such thattoggle arm552 is approximated with fixedarm535. Simultaneously, the distal end ofcable516 connected to pin556 moved into an “over-center” position, thereby stressingcable516 and lockingsurgical instrument500 in position. The surgeon is permitted to perform other procedures without maintaining pressure on the heart.
• Another embodiment of the heart stabilizer instrument is illustrated in FIG. 50 and disclosed at[0148]reference numeral600.Instrument600 is constructed and operates substantially as described above with regard toinstrument500, with the differences described below.Heart stabilizer instrument600 includesframe502, articulatingarm606 and mountingassembly506. Articulatingarm606 permitsfame502 to be placed at the appropriate height and angle with respect to the heart. Articulatingarm606 is composed oflink members608, and610 having a series of intermeshing teething to positively engage adjoining link members together.
• As illustrated in FIGS. 50A and 50B, link[0149]members608 are positionedadjacent link member610.Link member608 has generallycylindrical body portion612. A pair of rows ofconcave gearing614aand614bis disposed on oneaxial end616 oflink member608. A second pair of rows of concave gearing618aand618bis disposed on the secondaxial end620 oflink member608. Gearing614aand614bis disposed 90° out of alignment with gearing616aand616b.Longitudinal bore622′ extends throughlink member608 fromaxial end616 toaxial end620 between each pair of gearing.
• [0150]Link member610 hasbody portion624, to which first pair of gearing626aand626bhaving a convex profile and second pair ofconvex gearing628aand628bare attached to opposite sides thereof. First pair of gearing626aand626bis disposed90′ out of alignment with second pair of gearing628aand628b. A longitudinal bore (not shown) extends throughbody portion624 and between each pair of gearing626aand626band gearing628aand628b.
• [0151]Link member610 is placedadjacent link member608.Cable516 extends throughlongitudinal bore622 inlink member608 and longitudinal bore (not shown) inlink member610. Whentoggle552 is moved to the “over center” position (See, FIG. 47), thereby tighteningcable516, ink members'608 and610 are approximated such thatconvex gearing626a,626bor628a,628boflink member610 engagesconcave gearing614a,614band618a,618boflink member608.
• FIG. 51 illustrates another preferred embodiment of the surgical retractor in accordance with the subject disclosure. This surgical retractor, designated generally at[0152]700, includes abase702 and any one or more of the instruments shown including:retractor blade assembly704; retractor blade assembly with suction/irrigation structure706; retractor blade assembly withlight708;heart manipulator710; andheart stabilizer instrument712. These instruments are discussed in greater detail hereinbelow.
• [0153]Base702 is configured in accordance with the other bases discussed above and provides a low profile mount for instrumentation used in the surgical procedure being performed. A plurality of suture mounts714 are defined in an upperperipheral portion716 ofbase702 and serve as attachment and anchor points for suture ends718 from the surgical field. Referring to FIGS. 52 and 53, suture mounts714 include a tightly woundcoil spring720 positioned in acavity722 with the coils oriented substantially transverse to the radians of thebase702. Atriangular ramp724 is formed on an inner radial surface ofsuture mount714. Aslot726 is formed on an outer radial surface ofsuture mount714 beyondcoil spring720 and in axial alignment withramp724. This ramp/slot configuration facilitates easy access to positionsuture end718 incoil spring720.
• The balance of[0154]base702 is configured in substantially the same manner as previously described bases and includesteeth728, beveled innerperipheral surface730 andinner lip732.
• Surgical retractor blade assembly with blowing[0155]structure706 is shown in FIGS. 54-56.Structure706 can also be used for suction or for irrigation to remove fluids from the surgical site. Theretractor blade assembly704 is similar to theretractor blade assembly414 discussed in detail above.Retractor blade assembly704 includes mountingbracket734,retractor blade736 andremovable retraction knob738.
• As illustrated in FIG. 56, mounting[0156]bracket734 includeshousing740 and mountingplate742 which together form a channel through whichretractor blade736 is reciprocally slidable.
• [0157]Retractor blade736 includesbody portion744 andrib engaging portion746.Body portion744 defines a flangedgripping handle748 configured to be grasped by the surgeon in order to slideretractor blade736 relative to mountingbracket734.Body portion744 further defines longitudinally oriented rack gearing750 and a series ofsloping teeth752.Rack gearing750 andteeth752 are disposed alongelongated cavity754 defined inbody portion744.
• [0158]Teeth752 are releasably engaged bypawl756 mounted inhousing740. Operation of thispawl756 is substantially the same aspawl460 described above in connection withretractor blade assembly414.
• [0159]Rib engaging portion746 extends distally frombody portion744 and includes an angularly depending portion including one or more strengtheningribs758 to provide additional strength.
• Blowing structure[0160]760 is integrally formed into the retractor blade assembly shown in FIGS. 54-56. This structure includes atube762 which extends the length of the retractor blade assembly and exits thering engaging portion764 to access the surgical site. Atube connector764 is positioned at a proximal end oftube762 and connects to an appropriate source such as a vacuum or pressure source (not shown) depending on whether structure760 is used for blowing, irrigation or suction. Formingwire766 is positionedadjacent tube762 and is deformable to configuretube762 in a desired angular orientation. Alternatively,tube762 may be remotely oriented or rotated frombody portion744 using known structure.
• FIGS. 57 and 58 illustrate a retractor blade assembly with an integral light shown generally at[0161]708. The basic configuration and operation of this assembly is identical to that described above with the difference that a light768 has been substituted for suction/irrigation structure. A wide variety of lights can be accommodated. In the illustrated embodiment, a fiber optic bundle is disposed within alongitudinally extending sheath770. Afiber optic coupler772 is positioned adjacent the proximal end of the assembly and can be connected to an appropriate light source (not shown). It is also envisioned that a wide variety of divergent and focusing lenses may be used to tailor the light as required by the surgeon.
• The one-way ratchet mechanism used in these embodiments of the retractor blade assembly is shown in FIGS.[0162]58A-C. This ratchet mechanism operates in the same manner as the ratchet mechanism discussed above with respect to FIGS. 39-40. Note that as shown in FIG. 58B, theretractor blade736 can be pulled in the direction of the arrow to retract the bone and tissue. However, to move theretractor blade736 in the opposite direction, i.e. the direction of the arrow of FIG. 58C,pawl756 must be pressed in.
• FIGS. 59-63 illustrate another embodiment of a[0163]heart stabilizer instrument800 in accordance with the subject disclosure.Heart stabilizer instrument800 is substantially the same asheart stabilizer instrument500 discussed in detail above. The instrument includesframe802, articulatingarm804 and mountingassembly806.
• [0164]Frame802 is configured in the same manner asframe502 and includes a pair oflegs808aand808b, each having teeth810 for atraumatically contacting the surface of the heart.
• [0165]Frame802 is connected to articulatingarm804 byconnector812. Apositioning flange814 is formed onconnector812 and facilitates positioning offrame802 on the heart surface either by manually grasping theflange814 or by affixing a grasping instrument (not shown) to theflange814 and positioning the frame in a desired location.
• Mounting[0166]assembly806 is mounted adjacent the articulatingarm804 and includes mountingflange member830, mountingbase832, togglehousing834, andtoggle836. As shown in FIGS. 61-62, mountingbase832 has aflat bottom surface838 to rest on the top ofbase702. Mountingflange member830 and togglehousing834 are slidably mounted with respect to mountingbase832. Mountingflange member830 hasflange846 for engaging inner rim ofbase702.Toggle housing834 hasflange848 for engaging outer rim ofbase702.
• [0167]Toggle836 includes cylindrical mounting pins850 andfinger loop852. Cylindrical mountingpins850 are configured to be received withinrecess854 defined withintoggle housing834 and to be pivotably movable therein.Cable816 extends through articulatingarm804. The distal end portion ofcable816 is pinned to toggle836 byclip856.Biasing spring858 is positioned intoggle housing834 and serves to normally bias mountingflange member830 distally relative to togglehousing834.
• Handle spring member[0168]0.860 is integrally formed ontoggle836 and is configured to operatively interact withprotrusion862 formed incavity854 oftoggle housing834, astoggle836 is moved into and out of approximation withtoggle housing834.
• FIGS. 64-66, illustrate[0169]heart stabilizer instrument800 withcable816 in an unlocked, unstressed configuration. As illustrated in FIG. 64,instrument800 is placed onbase702 with mountingflange member830 and togglehousing834 spaced apart sufficiently to allowflanges846 and848 to clearinner rim830 andouter rim833, respectively.
• [0170]Toggle836 is disposed intoggle housing834 in an unlocked configuration, such thatfinger loop852 andfinger loop853 are spaced apartCable816 is loose to permit manipulation of articulatingarm804.
• FIG. 65 illustrates the relative position of[0171]handle spring860 relative toprotrusion862 withintoggle housing834.
• FIGS. 66-67 illustrate[0172]instrument800 withcable816 in a first taut, locked, unstressed configuration. As depicted in FIG. 66,toggle836 is pivoted with respect to togglehousing834 such thatfinger loop852 is moved towardfinger loop853. The distal end ofcable816 is stressed to approximate mountingflange member832 and mountingbase832 lockingsurgical instrument500 in position onbase702
• FIG. 67 shows the progression of[0173]toggle836 relative to togglehousing834 into the locked, unstressed configuration. In this position, articulatingarm804 can still be manipulated.
• The final, locked and stressed configuration is shown in FIGS. 68-69. In this configuration,[0174]finger loops852 and853 have moved into close approximation simultaneously, further stressingcable816 to maintain a preset configuration desired by the surgeon, e.g. to lock articulatingarm804 in place. Once locked into this locked-stressed configuration, the surgeon is permitted to perform other procedures without having to manually apply pressure on the heart via the heart stabilizer instrument.
• Another preferred embodiment of the[0175]heart manipulator900 in accordance with the subject disclosure is shown in FIG. 70. The heart manipulator includes amanipulator portion902, an articulatingarm904 and a mountingassembly906. The structure and operation of mountingassembly906 and articulatingarm904 are substantially the same as theheart stabilizer800 discussed above.
• The[0176]manipulator portion902 includes aframe908 supportingmesh910 and is preferably provided with a curved section adjacent a distal end thereof to assist in manipulation of the heart.
• FIGS. 71A and 71B illustrate a[0177]rib elevator980 which can be mounted to the aforedescribed bases to enable the patient's rib to be lifted.Rib elevator980 includes a set oftabs982 which engageinner lip732 for attachment to the base.Reinforcement ribs984a,984bformed on therear surface981, increase the rigidity ofrib elevator980 and also provide a gripping surface fur the user to flex therib elevator980 to facilitate attachment and removal from the base.Teeth986 function in the same manner as theteeth728 ofbase702, i.e. for mounting one or more ofretractor assemblies704,706,708. As can be appreciated, whenrib elevator980 is mounted tobase702, the mounted retractor assembly will be angled towards the rib so that a retraction force will be applied to the rib partially in an upward direction. This is advantageous, for example, for access and severing of the IMA. Therib elevator980 can subsequently be removed and a retractor assembly mounted directly to the base702 in the manner described above.
• FIGS. 71 and 72 illustrate two preferred kit configurations in accordance with the subject disclosure. Kit[0178]950 (FIG. 71) is formed to accommodate a basicblade retractor assembly704, a blade retractor assembly withsuction irrigation706, a blade retractor assembly withlight708, abase702, aretraction knob738, aheart stabilizer instrument800 and/or aheart manipulator900 therein.Cavities952,954,956,958 and960 are formed incover962 to accommodate these elements. Cover962 may be fixed tobottom964 by adhesive, ultrasonic welding, heating, etc.
• [0179]Kit970 is substantially similar tokit950 except that theheart stabilizer instrument800 and theheart manipulator900 are excluded. Cover972 includescavities952,958 and960 to accommodateretractors704,706,708,base702 andretraction knob738. Cover972 and bottom974 may be joined in the same manner as disclosed forkit950 above.
• [0180]Rib elevator980 can optionally be included in the kits.
• It will be understood that various modifications may be made to the embodiments shown herein. Therefore, the above description should not be construed as limiting, but merely as exemplifications of preferred embodiments. Those skilled in the art will envision other modifications within the scope and spirit of the claims appended hereto.[0181]

Claims (8)

What is claimed:

1. An instrument for stabilizing tissue for use with an instrument base, comprising;

an articulating arm having a plurality of link members arranged in a nested series, the link members being concatenated by a cable passing through a bore defined through each of the link members;

a mounting assembly operatively connected at one end of the articulating arm and a tissue engaging member operatively connected at the opposite end of the articulating arm;

an actuator operatively associated with the mounting assembly;

the cable being selectively movable by the actuator from a first, relaxed position which facilitates articulation of adjoining link members of the articulating arm and facilitates relative movement of the mounting assembly to the instrument base to a second, taut position which limits movement of the articulating arm and locks the mounting assembly relative to the instrument base.

2. An instrument for stabilizing tissue according toclaim 1 wherein the tissue engaging member includes a suction device operatively associated with the articulating arm.

3. An instrument for stabilizing tissue according toclaim 1 wherein at least one of the link members of the articulating arm includes a generally convex distal portion and an adjacent link member includes a corresponding concave proximal portion which nestingly receives the convex distal portion therein.

4. An instrument for stabilizing tissue according toclaim 1 wherein the tissue engaging member includes a frame having a pair of legs which extend therefrom, the legs being dimensioned to position tissue therebetween.

5. An instrument for stabilizing tissue according toclaim 1 wherein the tissue engaging member is selected from the group consisting of mechanical stabilizers, organ manipulating devices, suction devices, irrigation devices, illumination devices, and blowing devices.

6. An instrument for stabilizing tissue according toclaim 1 wherein the mounting assembly includes first and second opposed and relatively movable mounting portions which are selectively positionable relative to the instrument base upon activation of the actuator.

7. An instrument for stabilizing tissue according toclaim 1 wherein the actuator includes a fixed handle and a toggle handle, the toggle handle being selectively movable relative to the fixed handle from a first position wherein the fixed handle and the toggle handle are disposed in spaced-apart relation relative to one another to at least one subsequent position wherein the toggle handle is closer to the fixed handle.

8. An instrument for stabilizing tissue according toclaim 7 wherein movement of the toggle handle from the first position to the at least one subsequent position stresses the cable which limits movement of the articulation arm.

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