US 20080249635 A1
An obesity treatment device comprises a filament filler material movable between a substantially straight insertion/removal configuration and an operative configuration in which the filament extends along a predetermined curve to occupy a selected volume within the stomach and a retrieval device connected to a proximal end of the filler material facilitating grasping and withdrawal of the filler material. A method of treating obesity, comprises inserting to a desired position within the GI tract a filament filler in a substantially straight configuration and moving the filler into an operative configuration in which the filler curves along a predetermined path to define a desired volume in combination with, after a predetermined treatment period has elapsed, collapsing the filler into the substantially straight configuration for trans-oral removal.
1. An obesity treatment device, comprising:
a filament filler material movable between a substantially low profile insertion/removal configuration and an operative configuration in which the filament extends along a large profile to occupy a selected volume within the stomach; and
a retrieval device connected to a proximal end of the filler material facilitating grasping and withdrawal of the filler material.
2. The device of
3. The device of
4. The device of
5. The device of
a containment device forming an expandable pouch and an opening for insertion of the filler material therein so that the pouch expands upon movement of the filler material from the insertion/removal configuration to the operative configuration and collapses upon withdrawal of the filler material therefrom.
6. The device of
7. The device of
8. The device of
a flexible conduit insertable through the mouth and into the esophagus.
9. The device of
10. An obesity treatment device, comprising:
a hollow bubble having a shape that is one of substantially spherical and substantially ovoid, in an insertion/removal configuration, the bubble being sized to be slidably inserted through the esophagus and, in an operative configuration, the bubble being inflated to a desired volume within a stomach, the bubble including a flexible outer wall and a failure zone formed in the wall so that, when the bubble is subject to a predetermined stress, the wall fails along the failure zone; and
a handle being operatively connected to a proximal end of the polymer wall facilitating grasping and retrieval of the wall to draw the wall proximally.
11. The device of
12. The device of
13. The device of
14. A method for treating obesity, comprising steps of:
inserting to a desired position within the GI tract a filament filler in a substantially low profile configuration;
moving the filler into an operative configuration in which the filler curves along a predetermined path to define a desired volume; and
after a predetermined treatment period has elapsed, collapsing the filler into the substantially straight configuration for trans-oral removal.
15. The method of
inserting a retaining device to the desired position within the GI tract; and
inserting the filler into the retaining device so that an outer surface of the retaining device defines the desired volume.
16. The method of
17. The method of
18. The method of
removing the gastric filler by grasping, with an endoscopically inserted grasper, a tab connected to a proximal end of the filler.
19. The method of
inserting an overtube trans-orally into the GI tract, the overtube being movable between a straight insertion/removal configuration and a curved operative configuration; and
inserting the filler to the desired location via the overtube.
20. The method of
inserting a catheter trans-orally into the GI tract to deploy and retrieve the filler and selecting a volume of the filler in the operative configuration to occupy a desired portion of the stomach.
21. A gastric fill method, comprising steps of:
inserting into the stomach a bubble including a failure zone formed in a wall thereof such that, upon application of a proximally directed retrieving force, the wall to tears along the failure zone;
inflating the bubble to a desired volume;
after a desired treatment period has elapsed, applying the retrieving force to the filler, tearing the wall; and
retrieving the torn wall trans-orally.
22. The method of
23. The method of
24. The method of
This application claims the priority to the U.S. Provisional Application Ser. No. 60/910,356, entitled “GASTRIC FILLER DEVICES FOR OBESITY THERAPY” filed Apr. 5, 2007. The specification of the above-identified application is incorporated herewith by reference.
The incidence of obesity is rapidly increasing in industrialized countries and methods and procedures to control the weight of obese individuals is receiving ever increasing attention. In addition to diets and other lifestyle changes, aggressive medical procedures are available to limit caloric intake. Many procedures limit the amount of food digested by, for example, blocking or bypassing portions of the gastro intestinal (GI) tract. Other procedures focus on generating feelings of satiety after ingestion of reduced quantities of food.
One such treatment involves placing a filler material within the stomach, often through the esophagus. The filler material takes up room in the stomach, generating a feeling of satiety and reducing the desire to eat. The material also restricts and slows the passage of food through the stomach into the intestines, extending the duration of the feeling of satiety and the reduced desire to eat.
One type of filler includes gas filled bubbles which float upward and apply pressure on the greater curvature of the stomach wall. This pressure is sensed by baro-receptors in the greater curvature which send a signal to the brain indicating that the stomach is full. Fluid filled and other non-floating filling devices apply a downward force to the stomach wall which also generates feelings of satiety.
The present invention is directed to a gastric fill device comprising a conduit having a lumen with a distal end insertable in the stomach and a proximal end accessible externally, a filler material having a substantially straight string-like configuration used for insertion and for removal from the stomach, and an expanded operative configuration to occupy a selected volume within the stomach, and a retrieval element operatively connected to the filler material for grasping and withdrawing the filler material.
In another aspect, the present invention is directed to an obesity treatment device comprising filament filler material movable between a substantially straight insertion/removal configuration and an operative configuration in which the filament extends along one or more curves to occupy a selected volume within the stomach and a retrieval element connected to a proximal end of the filler material facilitating grasping and withdrawal of the filler material.
The present invention is further directed to a method of treating obesity comprising inserting to a desired position within the GI tract a filament filler in a substantially straight configuration and moving the filler into an operative configuration in which the filler curves to define a desired volume in combination with, after a predetermined treatment period has elapsed, collapsing the filler into the substantially straight configuration for trans-oral removal.
The present invention may be further understood with reference to the following description and to the appended drawings, wherein like elements are referred to with the same reference numerals. The present invention relates to devices and methods for treating obesity specifically, by partially filling a gastric space. More specifically, the present invention relates to the insertion and removal of gastric space filling devices which has previously proven difficult.
The methods and devices according to the present invention provide devices and methods for more easily deploying and removing space filling devices from the stomach and the upper GI tract. That is, after a predetermined time period has elapsed during which physical limiting of caloric intake is desired, it is preferable to remove the gastric filler from the stomach. However, removal of known gastric fillers has proven difficult for a variety of reasons. Embodiments according to the invention also provide novel space filling technologies and products that may be used as gastric fillers or as fillers in other body spaces designed to facilitate the insertion and removal procedures.
An exemplary gastric filler according to a first embodiment of the invention includes a gastric bubble formed with an integrated deflation and retrieval mechanism simplifying removal of the bubble after the desired treatment period has elapsed. The gastric bubble comprises a shell-like body formed of a polymeric wall including a failure zone pre-formed in the wall during a molding or other manufacturing operation as, for example, a weakening groove or indentation. The body may be a single filling volume or a series of filling volumes that are either independently or simultaneously fillable. As will be described in more detail below, during removal, the wall is torn along the weakening groove by the removal force, such that the balloon unwinds into an elongated strip that can be easily removed trans-orally. The gastric bubble may be inflated through a self sealing valve mechanism that seals itself when an inflation device (e.g., an inflation tube or catheter) is withdrawn from the valve. The valve may comprise any self sealing valve known to those skilled in the art, such as a basketball valve, a duckbill valve, etc. The bubble may be inflated using air or, alternatively, an inert gas or mixture of gases of predetermined density. In another embodiment, the bubble may be self expanded through a chemical and/or physical reaction with contents of the stomach. For example, the bubble may be inserted in an unexpanded state and upon delivery, may enter an expanded state by absorbing stomach fluids.
As shown in
The filler material in this exemplary filler balloon 200 is formed as a length of string 206 coupled to the tether end 202. The string 206 is inserted into the net 204 via an opening 212 after the bag 204 has been placed in the stomach or other desired location within the GI tract. As an alternative to or in addition to the string 206, other filler materials, such as hydrogels, beads, absorbable elements, etc., may be used to give the desired volume to the net 204. The filler material may also have a specified geometry that facilitates deployment, filling or removal of the balloon 200. Exemplary geometries include dimpled or porous surfaces and variable sized or shaped elements.
Both the string 206 and the bag net 204 may be inserted using endoscopic instruments and procedures allowing the trans-oral insertion and removal of these gastric filling devices to be accomplished easily and rapidly. As described above, the string-like filler material may be grasped at one end, such as by an end 210 attached to the tether 202, and pulled out through the esophagus and the mouth. The bag or net 204, once deflated by removing the filler material, may then be pulled out through the esophagus and mouth in the same manner described above for the string-like filler material. The string 206 may also be coupled to the bag 204 to facilitate removal of the bag 204 after the string 206 is removed. Thus, removal of both the string 206 and the bag 204 may be performed in a single step. In another embodiment, the tether 202 may comprise a ripcord coupled to the bag 204. That is, the tether 202 may perform a tearing or opening function. In an embodiment where the bag 204 comprises multiple filling volumes, the tether 202 may separate the multiple volumes and/or individually open or tear each volume separately as would be understood by those skilled in the art.
In a different embodiment according to the invention, the gastric fill material comprises a stand-alone filling device placed within the stomach without a constraining element such as a net or a bag. The filling device may comprise any shape that provides a desired filling characteristic. For example, the filling device may be shaped to fill a portion of the antrum (e.g., tapered, conical, etc.), thereby slowing gastric emptying. Exemplary filling device shapes include open coils, S-ribbons, stars, shapes with wide and/or irregular cross-sections, etc. The filling device may be formed of any biocompatible elastic material, such as stainless steel, platinum, titanium, a polymer, etc. In another embodiment, the filling device may comprise a shape memory material such as Nitinol and other materials used in the manufacture of embolic coils for treating aneurisms. The filling device may be inserted or removed through a working channel of an endoscope/delivery tube in a substantially low profile and deformed using any combination of mechanical, electrical or chemical techniques. Alternatively, the filling device may be delivered while wrapped around an exterior of the endoscope/delivery tube. In some embodiments, the filling device may be deformed using electricity, temperature change, a physical or chemical reaction (e.g., absorption of fluids), manual manipulation, etc. The deformation may be in multiple dimensions (e.g., three-dimensional expansion, two-dimensional torsion, etc.). In some embodiments, the deformation may be reversible so that the filling device may be withdrawn while maintaining the low profile.
In another embodiment, the stand-alone filling device may be formed of an interwoven material comprising a three-dimensional mesh or nest. A weaving pattern may be selected to facilitate insertion and removal of the filling device, or to regulate the transport of material through the stomach. The mesh may be woven into any number of shapes, such as those described above with reference to the stand-alone device (e.g., cones, stars, irregular patterns, curved patterns, etc.).
The coil 310 may be formed of a shape memory material. As would be understood by those skilled in the art, the shape memory properties of the coil 310 allow the coil 310 to be maintained in a substantially straight shape during insertion through the working channel of the endoscope with the material reverting to a memorized coil shape after deployment within the stomach 302. Thus, the substantially straight shape facilitates trans-oral insertion while the shape memory properties of the coil 310 allow it to expand to a pre-selected shape and volume without the need for a separate constraining device such as the bag, net or bubbles described above. As with the above-described embodiments, the operative shape and volume are selected so that, when in a desired position within the stomach 302, the volume taken and/or the stimulation applied to the wall of the stomach 302 enhances feelings of satiety. For example, the material of the coil 310 may be formed to take the form of a sphere or other hollow shell geometry after it has been deployed in the stomach 302. After completion of the treatment, the coil 310 may be returned to its substantially straight shape to be removed by, for example, grasping a proximal end of the coil 310 and drawing the coil into the working channel of an endoscope. The force of pulling into the endoscope causes the coil 310 to straighten. Alternatively, in other embodiments, the shape change may be caused by a stimulus such as an electrical signal, a chemical or physical reaction (e.g., absorption of fluid), etc.
In another embodiment, the coil 310 may be formed of an elastic material without shape memory, but with sufficient malleability so as to retain shape after being manually deformed. Alternatively, the elastic material may be biased towards the straight, low profile configuration, deforming to accommodate a natural curvature of the stomach wall.
The embodiments of the gastric filler according to the invention described above may be deployed and retrieved using conventional techniques, such as endoscopic procedures. However, improved devices to manipulate the gastric filling devices are within the scope of the invention. The improved methods and devices may be used in conjunction with the gastric filling devices described above, as well as with conventional gastric balloons and bubbles used for the treatment of obesity.
In one exemplary embodiment, access to the stomach of a patient may be provided by a catheter placed through the esophagus. A stent-like device is inserted through the catheter trans-orally in a compact configuration, such as folded unto itself. Once placed in the stomach, the device opens up like a stent, and takes up a selected volume within the stomach. This gives to the patient a feeling of satiety or fullness, so that less food is ingested. For example, the catheter may be a AAA stent-graft marketed by Trivascular and Boston Scientific Corporation, of Natick, Mass. The stent may comprise any number of shapes, including a cylinder, a ball and a torpedo. The stent is free floating in the stomach and may be sized to produce a desired amount of satiety.
In another exemplary embodiment, the delivery and retrieval system used for a gastric filling device utilizes a flexible overtube inserted into the GI tract and advanced until a distal end reaches a desired position within the stomach. At this point, a shape of the overtube may be locked so that forces applied to the overtube via devices inserted and/or withdrawn therethrough are absorbed by the overtube itself without being transferred to the surrounding tissue. Alternatively, the overtube may remain in an unlocked, flexible configuration so long as the overtube is maintained in the desired position.
As shown in
Alternatively, an overtube for use in conjunction with the invention may include all of the elements of the includes overtube 400 except for the shape locking mechanism and controller described to provide a passive, stable platform through which the gastric filling material may be inserted or removed.
The present invention has been described with reference to specific exemplary embodiments. Those skilled in the art will understand that changes may be made in details, particularly in matters of shape, size, material and arrangement of parts. Accordingly, various modifications and changes may be made to the embodiments. The specifications and drawings are, therefore, to be regarded in an illustrative rather than a restrictive sense.