the detailed embodiments of the present invention are disclosed herein . it should be understood , however , that the disclosed embodiments are merely exemplary of the invention , which may be embodied in various forms . therefore , the details disclosed herein are not to be interpreted as limiting , but merely as the basis for teaching one skilled in the art how to make and / or use the invention . referring to fig1 through 7 , a balloon - type gastric band 10 is disclosed in accordance with a preferred embodiment of the present invention . the gastric band 10 is generally composed of a reinforcing belt 12 to which an elongated balloon 14 is secured . the belt 12 includes a first end 16 and a second end 18 to which first and second latching members 20 , 22 are respectively secured when attached about a patient &# 39 ; s stomach 24 . in accordance with a preferred embodiment the first and second latching members 20 , 22 are shaped and dimensioned for selective engagement , and are the same as disclosed in commonly owned u . s . patent application ser . no . 11 / 182 , 072 , entitled “ latching device for gastric band ”, filed jul . 15 , 2005 , which is incorporated herein by reference . in accordance with a preferred embodiment , the belt 12 and balloon 14 are constructed as disclosed in commonly owned u . s . patent application ser . no . 11 / 364 , 343 , filed mar . 1 , 2006 , entitled “ precurved gastric band ”, which is incorporated herein by reference . in general , the belt 12 and balloon 14 may be respectively coupled by either overmolding or separate molding with subsequent adhesive bonding . in accordance with preferred embodiments , and as those skilled in the art will certainly appreciate , the balloon 14 and belt 12 may be secured together by either adhesive bonding , comolding , overmolding or mechanical connection ( for example , coupling sleeves ), which secures the balloon 14 and belt 12 in a manner resulting in the coupling of these distinct gastric band components . with the foregoing in mind , the balloon 14 employed in accordance with a preferred embodiment of the present application is constructed of an elastomeric material . due to the design of this balloon 14 , it does not inflate or expand in a manner causing high strain in the balloon 14 when filled during gastric band adjustment . rather , the balloon 14 is adapted to receive a large volume of fluid under a relatively low pressure . in this way , the balloon 14 receives fluid during application , but does not inflate or expand in a traditional manner creating strain along the walls of the balloon 14 . in other words , when the balloon 14 is filled up to the volume recommended to achieve maximum stomach restriction , there is no expansion of the balloon material . instead , the balloon 14 fills to some percentage of its total theoretical volume ( that is , maximum fill volume ). since the balloon 14 is not filled even close to its maximum fill volume , it remains low pressure , allowing the balloon 14 to conform to the stomach rather than the stomach to a rigid balloon . in accordance with a preferred embodiment of the present invention , the balloon 14 is designed with a maximum capacity of between approximately 10 cc and approximately 18 cc , and preferably 12 cc , although it will be fully filled for functioning in accordance with the present invention to achieve the smallest stoma size with approximately 9 cc to approximately 12 cc , and preferably 11 cc . by providing a balloon 14 , which is not at its capacity when properly filled for functioning , the softness and conformance of the balloon 14 is improved . while specific volumes are disclosed in accordance with a preferred embodiment of the present invention , those skilled in the art will appreciate the filling volumes may be varied without departing from the spirit of the present invention . as those skilled in the art will certainly appreciate , a supply tube 26 is used to connect the internal cavity 28 of the balloon 14 of the gastric band 10 with a fluid injection port 30 , for example , a velocity port . the utilization of the supply tube 26 with a remote fluid injection port 30 allows for controlled inflation and deflation of the balloon 14 in a predetermined manner . the exact position of the supply tube 26 is important in that the surgeon does not want tubing to be a visual obstruction during locking and / or other manipulation of the gastric band 10 . in addition , once placement of the gastric band 10 is complete , the supply tube 26 should not cause irritation to surrounding tissue ( for example , sticking directly into the liver or spleen ). surgeons also do not want to pull the supply tube 26 through a retro - gastric tunnel , since they cannot easily see if the tissue is being damaged . the supply tube 26 should also be able to act as a safe grasping location for manipulation of the gastric band 10 , the supply tube 26 must not kink at the junction to the gastric band 10 and prevent fluid flow , and the supply tube location should facilitate passage of the gastric band 10 through a small trocar . in accordance with a preferred embodiment , the supply tube 26 is connected to the balloon 14 as disclosed in commonly owned u . s . patent application ser . no . 11 / 364 , 362 , filed mar . 1 , 2006 , entitled “ gastric band ”, which is incorporated herein by reference . as mentioned above , current low pressure gastric band products , prior to insertion into the body , require that the surgeon evacuate the gastric band and tie a knot in the supply tube to maintain evacuation of the gastric band during the procedure . after the procedure is complete , the surgeon cuts the knot off of the supply tube . a locking connector is slid onto the supply tube and then the supply tube is pushed onto the barbed fitting on the fluid injection port . the locking connector is then slid up and locked to the fluid injection port to prevent the supply tube and fluid injection port from becoming disconnected in the body postoperatively . the need for knotting and cutting is obviated in accordance with the present invention by incorporating a check valve 32 at the end 62 of the supply tube 26 . then , instead of having to tie a knot in the end of the supply tube 26 , the surgeon only needs to attach a syringe 58 and evacuate the gastric band 10 via the check valve 32 . the check valve 32 helps the gastric band 10 maintain evacuation throughout the procedure . more particularly , and with reference to fig2 to 7 , the gastric band 10 includes a check valve 32 integrally formed at the proximal end 44 of the supply tube 26 . the locking connector 46 , in accordance with a preferred embodiment , is a male luer lock , which is integrated with the check valve 32 for attachment to the fluid injection port 30 in a manner discussed below in greater detail . in practice , the surgeon may , therefore , evacuate the gastric band 10 with a syringe 58 and the check valve 32 ensures that evacuation is maintained throughout the procedure . once the primary procedure is complete , the surgeon uses the locking connector 46 at the first end ( or mating end ) 34 of the check valve 32 to lock onto the fluid injection port 30 . this function requires the fluid injection port 30 to have the same geometry as the syringe 58 so the male luer lock , that is , the locking connector 46 , on the check valve 32 is compatible with both the syringe 58 and the fluid injection port 30 . in addition , and with reference to fig4 , the fluid injection port 30 is provided with a barb 60 , which , when the check valve 32 is locked in place on the fluid injection port 30 , keeps the check valve 32 open and allows the fluid to flow freely ( in both directions ) to and from the fluid injection port 30 . this ensures that during a postoperative gastric band adjustment , the supply tube 26 patency is ensured . more particularly , and with reference to fig4 and 5 where the gastric band 10 is shown connected to the fluid injection port 30 via the supply tube 26 , the supply tube 26 is connected to the fluid injection port 30 that provides a controlled supply of fluid to the balloon 14 of the gastric band 10 . improved filling is achieved by incorporating the check valve 32 between the supply tube 26 and the fluid injection port 30 . in accordance with a preferred embodiment , the check valve 32 includes a first end 34 and second end 36 . the first end 34 of the check valve 32 includes the input end 38 and the second end 36 of the check valve 32 includes the output end 40 ( as referenced based upon the flow of fluid from the fluid injection port 30 to the balloon 14 ). the first end 34 is adapted for connection with the outlet 42 of the fluid injection port 30 and the second end 36 is adapted for connection with a proximal end 44 of the supply tube 26 . the check valve 32 is constructed to prevent the flow of fluid therethrough in the direction from the first end 34 to the second end 36 to prevent the flow of fluid to the gastric band 10 while it is being evacuated before the supply tube 26 is secured to the pressurized fluid injection port 30 , while permitting the flow of fluid from the second end 36 to the first end 34 in a manner which allows for the evacuation of a gastric band 10 attached thereto . ultimately , the check valve 32 is structured to prevent the flow of fluid into the balloon 14 while the gastric band 10 is being secured about the stomach and the supply tube 26 has yet to be secured to the fluid injection port 30 . however , and as discussed above , once the balloon 14 of the gastric band 10 is evacuated , the proximal end 44 of the supply tube 26 , in particular , the first end 34 of the check valve 32 , is coupled to fluid injection port 30 and the balloon 14 is ready for inflation . in order to provide for the flow of fluid from the fluid injection port 30 through the check valve 32 and to the balloon 14 , the check valve 32 must be opened . a central barb 60 is , therefore , provided at the outlet 42 of the fluid injection port 30 . the barb 60 is shaped and dimensioned to engage the check valve 32 and open it in a manner permitting the flow of fluid from the fluid injection port 30 to the balloon 14 . the check valve 32 of the present invention may employ a variety of known valve structures . it is contemplated the valve structure may be a ball check valve , a butterfly valve , gate valve , vacuum relief valve , etc ., although other known valve structures could certainly be implemented without departing from the spirit of the present invention . as shown in fig4 , 5 , 6 and 7 , the check valve 32 is a ball type check valve and , therefore , includes a central ball 52 which is guided along a plurality of rails 54 between the first end 34 of the check valve 32 and the second end 36 of the check valve 32 . the ball 52 is biased toward the first end 34 by a spring 64 . when fully biased toward the first end 34 , the ball 52 engages the valve seat 56 in a manner preventing the flow of fluid from the first end 34 toward the second end 36 . when the ball 52 is positioned away from the valve seat 56 due to the central barb 60 or the needle 70 of the syringe 58 pushing the ball 52 in a direction toward the second end 36 of the check valve , the rails 54 permit fluid to flow about the central ball 52 as it is forced from the fluid injection port 30 to the supply tube 26 with the central ball 52 supported by the rails 54 moved toward the second end 36 of the check valve 32 or as the fluid is drawn from the balloon 14 by the action of the syringe 58 in evacuating the balloon 14 . while a preferred check valve structure has been disclosed herein , those skilled in the art will appreciate a variety of structures may be employed without departing form the spirit of the present invention . in accordance with a preferred embodiment of the present invention , the first end 34 of the check valve 32 is provided with a male luer lock 46 shaped and dimensioned for selective connection with a female luer lock 48 formed at the outlet 42 of the fluid injection port 30 . although a luer lock construction is disclosed in accordance with a preferred embodiment of the present invention , those skilled in the art will appreciate other connection structures may be employed without departing from the spirit of the present invention . similarly , the syringe 58 is provided with a female luer lock 66 for attachment during the evacuation stage . with regard to the second end 36 of the check valve 32 , it is provided with a barbed projection ( not shown ) shaped and dimensioned for frictional engagement within the proximal end 44 of the supply tube 26 leading to the internal cavity 28 of the balloon 14 . as with the first end 34 of the check valve 32 , a variety of connection structures are known to those skilled in the art and various connection structures may be applied in connecting the proximal end of the supply tube to the second end of the check valve without departing from the spirit of the present invention . by incorporating a check valve 32 as described above into the line feeding fluid to the balloon 14 of the gastric band 10 , the balloon 14 may be readily evacuated without requiring the surgeon to clamp the supply tube 26 prior to attachment of the supply tube 26 to the fluid injection port 30 . this improves efficiency and minimizes the steps that must be taken during a gastric band application procedure . in addition , the check valve 32 is provided with a pressure sensor 50 to measure the amount of pressure in the gastric band 10 . the present gastric band 10 is utilized in the following manner . first , the balloon 14 of the gastric band 10 is evacuated by securing a syringe 58 to the first end 34 of the check valve 32 , with the needle 70 of the syringe 58 moving the ball 52 away from the valve seat 56 and toward the second end 36 of the check valve 52 , and all of the fluid from the balloon 14 is drawn out of the balloon 14 , through the check valve 32 and into the syringe 58 as plunger 72 is moved . once the evacuation of the balloon is completed , the gastric band 10 is secured about the stomach of a patient in a traditional manner . thereafter , the proximal end 44 of the supply tube 26 , in particular , the first end 34 of the check valve 32 , is secured to the fluid injection port 30 . upon attachment of the outlet 42 of the fluid injection port 30 to the first end 34 of the check valve 32 , the central barb 60 engages the ball 52 to move it off of the valve seat 56 and toward the second end 36 of the check valve 32 . in this position , fluid may freely flow from the fluid injection port 30 to the balloon 14 and through the check valve 32 . in accordance with an alternate embodiment , the check valve may be cut from the supply tube after evacuation of the fluid from the balloon such that the supply tube may be directly connected to the fluid injection port . in accordance with various preferred embodiments of the present invention , different tube placements may be employed as disclosed in commonly owned u . s . patent application ser . no . 11 / 364 , 362 , entitled “ gastric band ”, filed mar . 1 , 2006 , which is incorporated herein by reference . although the present invention is described for use in conjunction with gastric bands , those skilled in the art will appreciate the above invention has equal applicability to other types of implantable bands . for example , bands are used for the treatment of fecal incontinence . one such band is described in u . s . pat . no . 6 , 461 , 292 . bands can also be used to treat urinary incontinence . one such band is described in u . s . patent application publication no . 2003 / 0105385 . bands can also be used to treat heartburn and / or acid reflux . one such band is described in u . s . pat . no . 6 , 470 , 892 . bands can also be used to treat impotence . one such band is described in u . s . patent application publication no . 2003 / 0114729 . while the preferred embodiments have been shown and described , it will be understood that there is no intent to limit the invention by such disclosure , but rather , is intended to cover all modifications and alternate constructions falling within the spirit and scope of the invention .
a balloon - type gastric band includes a balloon shaped and dimensioned to circumscribe the stomach at a predetermined location . the balloon includes a longitudinally extending body . a supply tube is secured to the balloon for fluid communication with an internal cavity of the balloon , wherein the supply tube includes a valve controlling the flow of fluid to and from the balloon .