|Publication number||US20060200062 A1|
|Application number||US 11/343,924|
|Publication date||Sep 7, 2006|
|Filing date||Jan 30, 2006|
|Priority date||Dec 20, 2000|
|Also published as||US6991643, US20020077661|
|Publication number||11343924, 343924, US 2006/0200062 A1, US 2006/200062 A1, US 20060200062 A1, US 20060200062A1, US 2006200062 A1, US 2006200062A1, US-A1-20060200062, US-A1-2006200062, US2006/0200062A1, US2006/200062A1, US20060200062 A1, US20060200062A1, US2006200062 A1, US2006200062A1|
|Original Assignee||Usgi Medical Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (8), Referenced by (46), Classifications (52), Legal Events (1)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The present invention relates generally to multi-barbed devices for maintaining tissue in apposition to promote wound closure and healing or for attaching tissue to adjacent structures or organs, and methods of use of such devices.
Several types of wound closure devices and methods are known, and typically include sutures, staples, surgical tapes and tissue adhesives. Application of most of these wound closure devices is time consuming, and requires considerable manual dexterity and patience. In addition, while these methods are functionally adequate, some may take too long to provide effective wound closure, or be cosmetically unappealing.
Most prevalent is the use of needles and sutures. Sutures provide high tensile strength, a low incidence of reopening, and can provide minimal cosmetic scarring. Application of sutures is by far the slowest method of obtaining wound closure, the sutures typically require removal and the use of anesthetic and have the highest tissue reactivity and application cost.
Surgical staples have the advantages of rapid application, low tissue reactivity, low cost, and reduced risk of needle-sticks (and hence transmission of blood borne disease) to the surgeon and attending staff. Staples generally have low tensile strength than sutures, generally must be removed, and may interfere with certain imaging modalities, such as MRI or CT scanning. In addition, because staples typically present smaller contact areas to the tissue being closed, they present a higher risk of the wound being torn open.
Surgical tapes provide the least tissue reactivity, rapid application, low infection rates and low cost, reduced risk of needle-sticks, and a high degree of patient comfort. Because such tapes are topically applied, they provide much lower tensile strength than sutures, and thus the highest incidence of inadvertent reopening. In addition, such tapes generally cannot be used in hairy body areas, and must be kept dry.
Tissue adhesives and sealants offer advantages of rapid application, low cost, and a high degree of patient comfort. In addition, such adhesives do not need to be removed. Drawbacks associated with tissue adhesives include low tensile strength and high incidence of wound reopening when applied in areas subject to high tensile loads.
Most biologically derived sealants adhere to tissue by participating in the normal clotting cascade. Fibrin glues, for example, are generally used to control bleeding or to reinforce suture or staple lines rather than to make tissues adhere, thus functioning more as hemostatic agents than glues. While several new technologies are under development that offer the potential for use in diffuse bleeding sites, fibrin glues generally are most effective in areas of inactive bleeding.
Drawbacks common to many previously known wound closure techniques, such as sutures and staples, typically involve the skin in one way or another and therefore cause disfigurement of the skin (i.e. the suture penetration points). In addition, because such devices only hold the tissue together at certain points, they do not take advantage of the entire tissue surface area to create a strong bond.
Drawbacks associated with tissue adhesives and sealants are that most of these glues take several minutes to set, may not work in a wet environments and provide only limited tensile strength. Such glues work by binding with individual molecules on either side of the wound and therefore recruiting a large surface area in the act of binding the two surfaces together. This is an improvement over the needle and suture method where discrete “points” or tracks defined by the puncture sites of the needle where the suture passes through or the puncture site of the staple have the role of providing support for the coaptation of the two surfaces.
In view of the foregoing, it would be desirable to provide wound closure devices and methods that merge the desirable features of previously known wound closure systems, i.e. to take advantage of the entire surface in coaptation as well as utilizing a mechanical element to retain the tissue portions in apposition.
It further would be desirable to provide wound closure devices and methods that allow a surgeon to close a wound rapidly and effectively without damaging the skin surface adjacent the wound, thus creating a scar.
It also would be desirable to provide wound closure devices and methods that provide a high-tensile strength bond and are not visible from outside the skin.
It still further would be desirable to provide wound closure devices and methods that may be used not only to establish and retain tissue portions . . . in apposition, but which also may be used to provide adhesion to a large surface area, e.g., such as for hernia repair or attaching large skin grafts onto the surface of the body.
It also would be desirable to provide wound closure devices and methods wherein the devices may be configured in different shapes for different applications, including such shapes as a sheath, a cylinder, a ball a strip or a long rod like shape, and may be used intraoperatively or laparoscopically.
It yet further be desirable to provide wound closure devices and methods that can be used in wet or bleeding environments without significant loss of intended function.
It also would be desirable to provide wound closure devices that can be doped with a therapeutic agent, e.g., growth factor or thrombin, to aid wound healing or a clot enhancement.
In view of the foregoing, it is an object of the present invention to provide multi-barbed wound closure devices and methods for establishing and maintaining two sides of a wound in apposition.
It is another object of this invention to provide wound closure devices and methods that merge the desirable features of previously known wound closure systems, for example, by taking advantage of the entire surface in coaptation as well as utilizing a mechanical element to retain the tissue portions in apposition.
It is another object of the present invention to provide wound closure devices and methods that allow a surgeon to close a wound rapidly and effectively without damaging the skin surface adjacent the wound.
It also is an object of this invention to provide wound closure devices and methods that provide a high-tensile strength bond and are not visible from outside the skin.
It further is an object of the present invention to provide wound closure devices and methods that may be used not only to establish and retain tissue portions in apposition, but which also may be used to provide adhesion to a large surface area, e.g., such as for hernia repair or attaching large skin grafts onto the surface of the body.
It still further is an object of the present invention to provide wound closure devices and methods wherein the devices may be configured in different shapes for different applications, including such shapes as a sheath, a cylinder, a ball a strip or a long rod like shape, and may be used intraoperatively or laparoscopically.
It yet further is an object of the present invention to provide wound closure devices and methods that can be used in wet or bleeding environments without significant loss of intended function.
It also is an object of this invention to provide wound closure devices that can be doped with a therapeutic agent, e.g., growth factor or thrombin, to aid wound healing or a clot enhancement.
In accordance with the principles of the present invention, the wound closure device comprises a substrate having a plurality of biodegradable barbs extending from at least one surface of the substrate. The multi-barbed device therefore permits closure of a wound in a timely, cosmetic and convenient manner.
The substrate generally is in the form of a thin strip of bioabsorbable polymer, and may be solid or have perforations forming a mesh. Where provided, the perforations allow the tissue and body fluids to contact the other side and enhance the healing process.
Where designed for applications in bringing the tissue edges of a wound into apposition and maintaining the tissue in fixed relation during healing, the substrate is provided with a multiplicity of barbs projecting from opposing sides of the substrate. The barbs have a sharpened distal end to facilitate tissue penetration, and hooks that grasp the tissue penetrated. Alternatively, the multiplicity of barbs may project from only one side of the substrate, for example, where the device is to be used to mend large areas of tissue, e.g., in hernia repair.
In accordance with the methods of the present invention, the multi-barbed device of the present invention is inserted within a wound or underneath the skin, and mechanically attaches to and brings the opposing tissue sides together.
The above and other objects and advantages of the present invention will be apparent upon consideration of the following detailed description, taken in conjunction with the accompanying drawings, in which like reference characters refer to like parts throughout, and in which:
Referring to FIGS. 1 to 4, a preferred embodiment of multi-barbed, multi-sided device 20 of the present invention is described for attaching coapting and maintaining two sides of a wound. Device 20 comprises substrate 21 having multiplicity of barbs 22 projecting from opposite sides 23 and 24. Barbs 22 have sharpened distal ends 25 that enable the barbs to penetrate tissue.
Substrate 21 may be either rigid or flexible, and preferably comprises a thin sheet or strip of a bioabsorbable polymer that can be absorbed by the body such as polylactic acid, polyglycolic acid, polycaprolactone, polyethylene glycol, or other bioabsorbable polymers known in the art. Substrate 21 may by either solid or include mesh-like perforations 26 that permit the wound edges to communicate with one another, thereby facilitating the healing process. Depending upon the intended application, substrate 21 may be made sufficiently flexible to conform to the tissue to be joined.
In the embodiment of
Barbs 22 preferably comprise a material that is sufficiently rigid to penetrate tissue during application, and is capable of withstanding the tensile forces expected during normal use, i.e., so the barbs cannot be pulled out and shanks 27 will not fracture in large numbers. Barbs 22 may comprise a bioabsorbable polymer, metal, or metal alloy. Barbs 22 may be made having shank lengths ranging from a fraction of a millimeter, e.g., for plastic surgery, to many millimeters, e.g., for large operations or veterinarian use.
Perforations 26 in device 20 reduce concerns that the substrate would be a barrier to healing, and instead allow the tissue edges and body fluids to contact one another across through substrate 21, thereby accelerating the healing process. The perforations are passageways for the tissue and body fluids to have free communication from one side to the other. Perforations 26 may comprise up 90% or more of the area of substrate 21.
In addition, substrate 21 and/or barbs 22 may be coated or impregnated with an anesthetic to reduce pain during wound healing. Alternatively, device 20 may include other drugs or therapeutic agents that provide some therapeutic effect during healing, for example, angiogenic agents or growth factors to facilitate wound healing, anti-inflammatory agents to reduce swelling or antibiotics to reduce infection.
Device 20, and the alternative embodiments described hereinafter, have a number of applications, including:
Still referring to device 20 to
Referring now to
Barbs 32 may be disposed only in regions adjacent to the ends of tube 30, or as shown in
In accordance with the methods of the present invention, if a blood vessel or a tendon is inserted into tube 30, it will be firmly engaged by the plurality of barbs 32, and will be unable to come back out of the tube. Thus, two ends of a torn tendon may be inserted into the tube 30 to provide a strong connection.
Artificial cartilage 50 is introduced arthroscopically in a contracted condition. Once disposed within in the knee space, artificial cartilage 50, including substrate 51, is unrolled over the tibial chondyle. High-pressure balloon 55, or some other mechanical means, e.g., a mallet, is then used to apply a force on the surface of the artificial cartilage and substrate, thereby forcing the multiplicity of barbs 52 into engagement with bone B.
With respect to
With respect to the above description, it is to be realized that the optimum dimensional relationships for the parts of the invention, to include variations in size, materials, shape, form, function and manner of operation, assembly and use, are deemed readily apparent and obvious to one skilled in the art, and all equivalent relationships to those illustrated in the drawings and described in the specification are intended to be encompassed by the present invention.
Although preferred illustrative embodiments of the present invention are described above, it will be evident to one skilled in the art that various changes and modifications may be made without departing from the invention. It is intended in the appended claims to cover all such changes and modifications that fall within the true spirit and scope of the invention.
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|International Classification||A61F2/06, A61F2/08, A61L31/16, A61B17/11, A61F2/46, A61B17/03, A61F2/30, A61B17/00, A61F15/00, A61B17/08, A61F2/00, A61F2/44, A61F2/38|
|Cooperative Classification||A61F2/4455, A61F2002/30784, A61F2002/4681, A61F2002/4628, A61B2017/1103, A61F2/064, A61F2310/00976, A61F2/08, A61L31/16, A61F2/4618, A61F2/30756, A61F2002/30841, A61B17/11, A61F2/0063, A61B17/08, A61L2300/414, A61F2/442, A61F2002/30892, A61F2/06, A61L2300/418, A61F2/30767, A61B2017/00004, A61B2017/081, A61F2002/4635, A61F2002/30894, A61F2310/00796, A61F2/389|
|European Classification||A61F2/44D, A61L31/16, A61F2/06C, A61F2/00H, A61B17/11, A61F2/46B12, A61F2/30C, A61F2/44F, A61F2/08, A61B17/08, A61F2/06|
|Mar 13, 2006||AS||Assignment|
Owner name: SAADAT, VAHID, CALIFORNIA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:USGI MEDICAL INC.;REEL/FRAME:017305/0920
Effective date: 20060308