Abstract:
The device is a tissue retractor including versions having a combination of an anchor and a tissue retention member for the displacement of tissue obstacles and the like during medical procedures.

Description:
PRIORITY  
       [0001]     The application claims priority from the disclosure of U.S. Provisional Patent Application Ser. No. 60/757,237 entitled Laparoscopic Tissue Retractor, filed Jan. 9, 2006, which is herein incorporated by reference in its entirety. 
     
    
     BACKGROUND  
       [0002]     The present disclosure relates to devices, systems and methods used for retracting organs and/or body tissue during surgical procedures and, more particularly, to endoscopic or laparoscopic apparatus, systems and methods for retracting or positioning body tissue and/or body organs during minimally invasive surgery.  
         [0003]     As a result of the recent technological improvements in surgical instruments, surgical procedures, using minimally invasive techniques, such as endoscopic and laparoscopic, are routinely performed, where such surgical procedures generally cause less trauma to the patient.  
         [0004]     In endoscopic and laparoscopic surgical procedures, tissue and organs located in the area of operation frequently obstruct a surgeon&#39;s view or become obstacles in the workspace. Generally, laparoscopic surgical procedures involve the introduction of a gas, such as, carbon dioxide, to insufflate a body cavity such as, for example, the abdomen, to provide a working area for the surgeon. After the abdomen is insufflated, a trocar device is commonly used to puncture the peritoneum to provide an access port by way of a cannula through the abdominal wall for the introduction of surgical instrumentation. Generally, a trocar or cannula is placed through the abdominal wall for each piece of surgical instrumentation which is necessary to carry out the surgical procedure. In this manner, the surgeon may view the surgical site through an endoscope provided through a first trocar/cannula, and utilize a second trocar/cannula to introduce a surgical instruments. However, the surgeon must also frequently navigate the instruments around tissue and/or organs within the patient.  
         [0005]     Although the insufflation gas expands the abdomen to permit the surgeon to view the surgical site, it is often necessary to manipulate the internal organs or tissues to provide a clear path to the surgical objective. In the past, instruments have been utilized that pull on the organs or tissues to move them out of the way to provide a clear visual path for the surgeon. Such devices are disclosed in, for example, U.S. Pat. No. 4,654,028 to Suma, U.S. Pat. No. 4,909,789 to Taguchi et al., and U.S. Pat. No. 5,195,505 to Josefsen. Other retractor devices include collapsible fingers and are disclosed in, for example, U.S. Pat. No. 5,456,695 to Herve Dallemange, U.S. Pat. No. 4,190,042 to Sinnreich, and U.S. Pat. No. 4,744,363 to Hasson. Other devices include retractors having expandable frames for supporting expandable latex sheaths or covers, such as those described in U.S. Pat. No. 5,178,133 to Pena.  
         [0006]     It would be advantageous to provide a laparoscopic organ retraction system having sufficient strength and durability to retract body organs from the operative site that combines both a tissue anchor and a tissue retraction member. It would be further advantageous to provide an organ retraction system that is cost effective and easy to use.  
     
    
     BRIEF DESCRIPTION OF THE FIGURES  
       [0007]     In accordance with versions herein, it is believed the present invention will be better understood from the following description taken in conjunction with the accompanying drawings. The drawings and detailed description that follow are intended to be merely illustrative and are not intended to limit the scope of the invention.  
         [0008]      FIG. 1  presents a perspective view of an organ retraction instrument shown in the closed position;  
         [0009]      FIG. 2  presents a perspective view of an organ retraction instrument shown in the open position;  
         [0010]      FIG. 3  presents a perspective view of an alternate version of an organ retraction instrument shown grasping and retracting tissue within a patient;  
         [0011]      FIG. 4  presents a perspective view of an alternate version of an organ retraction instrument shown in the open position;  
         [0012]      FIG. 5  presents a perspective view of an alternate version of an organ retraction instrument shown in the closed position; and  
         [0013]      FIG. 6  presents a perspective view of an alternate version of an organ retraction instrument shown grasping and retracting tissue within a patient. 
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0014]     The present invention shall be discussed in terms of endoscopic and laparoscopic procedures and apparatus. However, use herein of terms such as “endoscopic” and “laparoscopic”, among others, should not be construed to limit the present invention to an apparatus for use only in conjunction with such procedures. To the contrary, it is believed that versions herein may find use in procedures wherein an organ or other tissue may be advantageously displaced such as, for example, in the abdomen and thoracic cavity.  
         [0015]     Referring to the figures,  FIGS. 1-2  illustrate one version of a tissue or organ retractor  10  adapted for laparoscopic insertion, having a proximal and a distal end, shown in a “closed” position ( FIG. 1 ) and an “open” position ( FIG. 2 ). In one version, the retractor  10  includes a retraction member  12  and an anchor  14 , where the retraction member  12  and the anchor  14  are coupled with a support member  16  and cooperate to displace an organ, such as the liver, or other tissue.  
         [0016]     The anchor  14  may include a set of grasping jaws  18  operably configured to retain tissue therebetween, such as the patient&#39;s diaphragm, or otherwise secure the retractor  10  for deployment. The grasping jaws  18  may articulate in a scissor-like motion and may be articulated by, for example, actuating a drive member  20  attached thereto. The drive member  20  may be, for example, a rod or tube coaxial with the support member  16  operably configured to translate therethrough.  
         [0017]     The grasping jaws  18  may be connected to the support member  16  via a hinge (not shown) and to the drive member  20  such that actuating the drive member  20  articulates the grasping jaws  18  about the hinges to an open and closed position. After insertion of the retractor  10  into a patient&#39;s body, the grasping jaws may be opened with the drive member  20  and positioned to accept tissue therebetween. The drive member  20  may then be actuated to close the grasping jaws  18  such that the retractor  10  is secured to the tissue.  
         [0018]     It will be appreciated that the anchor  14  may include any suitable means for securing the retractor  10  to tissue prior to deployment such as, for example, with suction or with an anchor adapted to puncture and hold tissue. The anchor  14  and/or drive member  20  may be articulated or actuated by any suitable means including, but not limited to, a handle (not shown) having a trigger, screw, electric, and/or mechanical drive system.  
         [0019]     Referring to  FIG. 3 , once the retractor  10  is secured to tissue, the retraction member  12  may be deployed. In one version, the retraction member  12  is an annular sleeve having a proximal end and a distal end. The distal end of the retraction member  12  may be permanently coupled at about the distal end of the support member  16  while the proximal end of the retraction member  12  may be free to translate longitudinally. Referring to  FIG. 2 , the retraction member  12  may include longitudinal slits defining supports  24  that expand ( FIG. 3 ) on, for example, a living hinge when the proximal end of the retraction member  12  is pushed distally. In one version, the retraction member  12  and/or supports  24  are configured from a flexible, elastomeric, and/or memory retention material, such as nitinol, and are operably configured to expand or deploy with sufficient strength to move, retain, and/or hold tissue.  
         [0020]     It will be appreciated that the retention member  12  and/or supports  24  may be constructed from any suitable material, such as a metal frame or polymeric frame, and may be configured to any suitable shape during and prior to deployment. For example, the retention member may be inflatable in whole or in part, substantially planar or paddle-shaped, and/or may have any other suitably shaped frame. It will be appreciated that the retention member  12  may include rigid, semi-rigid, memory retention, and/or flexible components such as, for example, where the proximal end and the distal end of the retention member are rigid and the supports  24  located therebetween are constructed from a flexible material. It will be further appreciated that the retention member  12  may include one or a plurality of supports  24  where, for example, the retention member  12  has four supports (not shown) expandable around the radius of the retractor  10  in increments of ninety degrees.  
         [0021]     In a further version (not shown), the retraction member  12  may be operably configured to rotate about the support member  16  such that the surgeon may position the supports  24  in an advantageous position for retracting tissue while maintaining the anchor  14  at a desired tissue location. Rotation may be accomplished, for example, with a tongue and groove connection between the retention member  12  and the support member  16 .  
         [0022]     Referring to  FIGS. 2-3 , in one version, the retractor  10  includes a catch  26  operably configured to retain the shape of the retention member  12  when the supports  24  are deployed. The catch  26  may, for example, be held within a recess (not shown) within the support member  16  and may be retained therein when covered by the retention member  12 . When the retention member  12  is actuated distally, the catch  26  may become unsheathed and may assume the position illustrated in  FIG. 2 . The catch  26  may be opened, for example, automatically by providing the catch  26  with a spring bias that pushes the catch  26  outward when unsheathed. It will also be appreciated that the catch  26  may be manually engaged and/or disengaged by a surgeon via a lever or the like. In an alternate version, the catch  26  may be positionable to expand or retract the supports  24  at a desired location. For example, the catch  26  may ride in a longitudinal track (not shown) and may be actuated proximally and distally, thereby expanding and retracting the supports  24 , before being locked into place to secure the supports  24  at a desired position and/or expansion.  
         [0023]     It will be appreciated that catch  26 , or any other suitable assembly or component for sizing, shaping, and/or securing the retention member  12 , are contemplated. For example, an annular collar (not shown), having a lateral set screw therein, may be placed about the support member  16  such that longitudinally translating the collar along the support member  16  opens and closes the retention member  12 . When the retention member  12  is set to a desirable shape and/or configuration, the set screw may be tightened to hold the annular collar in place. The annular collar may, for example, be adjusted throughout the procedure or may be left in place until removal is necessary.  
         [0024]     Referring to  FIGS. 4-6 , an alternate version of the retractor  10  is disclosed having hinges  30  positioned at the intersection of the supports  24  and the retraction member  12 . Additionally, an alternate embodiment may include one or a plurality of hinges  32  positioned on the supports  24 .  
         [0025]     Deploying the retention member  12  of the retractor  10  may provide a surgeon with, for example, more visibility or a better workspace during a laparoscopic procedure by displacing or otherwise moving tissue obstacles or the like. Securing the retractor  10  to the patient internally with the anchor  14  may reduce the number of cumbersome or awkward instruments in the surgical field outside the patient&#39;s body. Additionally, by integrating an anchor with a retention member, the surgeon may be provided with an efficient, cost-efficient, and easy to use instrument that is effective without taking up a significant amount of space. By providing flexible or jointed supports, versions of the present invention may provide a broad surface with which to restrain or hold tissue, while still having the benefit of an instrument that can be guided through, for example, a 5 mm or 10 mm port, although it will be appreciated that versions herein may be used independently of such ports.