US 20050203550 A1
Devices and systems related to surgical fasteners and more specifically to surgical fasteners suitable for use in both open procedures, and minimally or less invasive procedures where the operative site is remote from the surgeon.
1. A surgical fastener for deployment through a device, the fastener comprising:
a first anchor member;
a second anchor member;
a connecting portion separating the first and second anchor members; and
where at least the first anchor member and the second anchor member each are expandable from a first state to a second state where the second state is of a larger size than the first state.
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28. A surgical fastener for deployment through a device, the fastener comprising:
a first means for anchoring the fastener;
a second means for anchoring the fastener and;
a connecting portion separating the first and second means for anchoring.
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The present invention relates to surgical fasteners and more specifically to surgical fasteners suitable for use in both open procedures, and minimally or less invasive procedures where the operative or surgical site is not directly accessible by the surgeon.
Surgical fasteners are known to be an alternative to traditional suturing techniques for procedures involving tissue closure, connection, or repair. One undesirable aspect of manual suturing is that the suturing process adds time to the overall surgical process. Moreover, manual suturing often requires that the operative area is readily accessible so that the medical practitioner can manipulate the suture and associated needle through both sides of the tissue, connection or repair site. Presently, surgical fasteners are known to provide a means to close an open surgical incision or wound, hold together pieces of soft tissue, attach devices to tissue, or repair torn tissue in orthopedic/musculoskeletal applications. Such surgical fasteners are often used where there is adequate access to the operative area, or for invasive, open procedures.
Due to the inherent risks and complexities of invasive surgical procedures, there is an increasing need for the ability to perform surgical procedures in a minimally invasive manner. In most cases, the recuperative time and lowered expense of a minimally invasive procedure makes it a far more desirable option to an alternative comparable invasive/open surgical procedure. The use of surgical fasteners in minimally invasive procedures may be desirable to increase the speed and efficiency of the procedure. Such fasteners may also open the possibility of performing a minimally invasive procedure for what was previously limited to an open surgical procedure.
In addition, suturing techniques requires considerable skill and dexterity especially when tying knots in the suture or otherwise manipulating the suture. The ability of a medical practitioner to manipulate a suture as well as knot the ends of the suture are further complicated when the site is not directly accessible to the practitioner. In such cases, even if the complexity of suturing does not prevent the procedure from being completed in a minimally invasive manner, the length of the procedure is likely to increase.
Conventional fasteners do not easily lend themselves for use in minimally invasive surgical procedure. As one example, the complexity of the known fastener-delivery devices requires devices with large profiles and limited flexibility further thereby limiting the potential for such devices to access remote locations. Conventional surgical fasteners, especially, “I-shaped” or “H-shaped” fasteners are unsuitable for remote procedures due to their complex deployment mechanisms and inability to navigate tortuous pathways using access devices commonly used for minimally invasive procedures (e.g., catheters, introducer devices, scope-type devices such as endoscopes, bronchoscopes, colonoscopies, etc.). Examples of such fasteners and devices are discussed in U.S. Pat. No. 4,006,747 to Kronenthal et al., U.S. Pat. No. 4,235,238 to Ogiu et al., U.S. Pat. No. 4,669,473 to Richards et al., U.S. Pat. No. 5,941,439 to Kammerer et al,. U.S. Pat. No. 6,039,753 to Meislin, and U.S. Patent Publications US2003/0097148 to Valimaa et al, U.S. 2003/0187465 to Bailly et al. Each of the foregoing patents and/or patent applications is hereby incorporated in their entirety by reference.
The present invention includes a surgical fastener for deployment through a device (such as tubular device, a needle, cannula, catheter, etc.), where the fastener comprises a first anchor member, a second anchor member, and a connecting portion separating the first and second anchor members, where at least the first anchor member and the second anchor member each are expandable from a first state to a second state where the second state is of a larger size than the first state, where the larger size may be achieved by an increase in displacement (e.g., volume, profile, configuration, etc.) of a portion of the fastener or the entire fastener. For example, as it assumes the second state, the anchor may change in shape or conform to a profile that is of a larger size than the profile of the first state. Alternatively, or in combination, the increase in volume may be achieved by relaxing a previous state of compression of the fastener portion. In the latter case, the fastener portion may comprise a resilient material that is compressible, and/or the fastener portion may be hollow, or have a cavity, such that the outer perimeter of the anchor portion may be folded into the cavity to assume the first state, or compress the cavity to conform to a smaller state.
The surgical fastener may also comprise a first means for anchoring the fastener, a second means for anchoring the fastener and a connecting portion separating the first and second means for anchoring. Where the means for anchoring may be any of the anchor portions described herein.
The invention also includes a surgical fastening system comprising, a tubular member having a proximal and distal end and a lumen extending therebetween, the tubular member being sufficiently flexible to navigate tortuous anatomical passages within a human body, a distal portion located at the distal end of the tubular member, the distal portion having a distal tip being configured to pierce tissue, the distal portion having a lumen extending between the tubular member lumen and an opening in the distal portion, at least one surgical fastener slidably located entirely inside the tubular member lumen, where the surgical fastener comprises a first anchor member, a second anchor member, and a connecting portion separating the first and second anchor members, and an advancing member slidably located within the tubular member lumen such that advancement causes a distal portion of the advancing member to advance the surgical fastener through the tubular member. The system of the present invention may be directed to the desired site using a catheter-guidewire configuration, shaped catheter, a steerable catheter, a scope-type of device (e.g., such as endoscopes, gastroscope, colonoscope, bronchoscope, or any type of scope used to access sites within the body.)
It should be noted that alternate variations of the present invention include fastening system of the present invention used with conventional fasteners and/or fasteners of as described herein.
The present invention is useful in many surgical procedures requiring fastening systems, including but not limited to, procedures for fastening or repairing tissue or attachment of implant materials to tissue. The present invention is suitable for, but not limited to, use in the heart, stomach, gastro-intestinal tract, etc. While the faster and fastening system may be used in open procedures, the devices and systems may also be used in minimally invasive procedures where the operative site is remotely accessed using minimally invasive techniques including catheterization and/or endoscopic or similar means.
The inventive devices are especially suited for advancement via a minimally invasive technique by providing features which improve the ability of the surgeon to deploy the fastener with accuracy and effectuate a proper seal with the fastener. The minimally invasive technique also may allow for visual inspection of the placement of the anchor.
This application incorporates by reference an application filed Mar. 11, 2004 entitled “SURGICAL FASTENING SYSTEM” having application number ______.
The following illustrations are provided as variations of the present invention. It should be understood that there are many combinations of the present invention and that figures illustrating all variations of the invention would be numerous. Therefore, the invention is intended to include combinations of aspects and features of the illustrated embodiments, or combinations of the specific embodiments themselves.
In use, the fastener 100 may be delivered to the operative site when the portions of the fastener 100 are in the first state. Upon deployment, selected portions of the fastener 100 assume the larger second state. This configuration allows for delivery of the fastener 100 through an opening in the medium where the opening is smaller than a diameter (or other similar dimension) of the fastener 100 portions after deployment. In some variations of the invention, construction of the fastener 100 allows only a portion (e.g., a single anchor, both anchors, the connecting portion, or a combination thereof) to expand into the second state. In other variations, the entire fastener 100 may be constructed to assume the second state upon deployment. It is contemplated, that the various portions of the fastener 100 may expand differently as required for the particular application (e.g., one or more portions expand at a different rate, a different size, etc.)
Expansion of the fastener 100 from the first to the second state may be accomplished a variety of ways. For example, the fastener 100 may be constructed of a shape or material that allows compression of the fastener portion, either by application of a compressive force or application of a vacuum, etc. Alternatively, or in combination, the fastener 100 may include a material that swells or expands given the addition of a fluid (e.g., natural body fluids or fluids introduced during the surgical procedure.)
Examples of these materials include biodegradeable and non-biodegradeable polymers, elastomers, shape-memory alloys, other alloys, etc.) For example, carbonate copolymer, polyether ester copolymer, albumin, gelatin, starch, cellulose, dextrans, polysaccharides, fibrinogen, poly (D,L lactide), poly (D,L-lactide-co-glycolide), poly (glycolide), poly (hydroxybutyrate), poly (alkylcarbonate) and poly (orthoesters), EVA copolymers, silicone rubber and poly (methylmethacrylate). Particularly preferred polymeric carriers include poly (ethylene-vinyl acetate), poly (D,L-lactic acid) oligomers and polymers, poly (L-lactic acid) oligomers and polymers, poly (glycolic acid), copolymers of lactic acid and glycolic acid, poly (caprolactone), poly (valerolactone), polyanhydrides, copolymers of poly (caprolactone) or poly (lactic acid) with polyethylene glycol, PET, PETE, and blends thereof.
In any case, the second state of the fastener comprises a larger profile or configuration as compared to the first state. As stated above, this permits securing of the anchoring portions 102 104 about the medium and/or securing of the connecting portion 106 within the medium. Another advantage of the invention is that the opening in the medium created during deployment of the fastener 100 may be smaller than would otherwise be possible if the fastener did not expand into the second state upon or after deployment.
It is also contemplated that the fastener may incorporate a variety of additives, coatings, adjuncts, etc. For example, the fastener (or only portions of the fastener) may include a lubricious coating to improve advancement of the fastener in the delivery system. The fastener may include non-proliferative drugs, thrombogenic additives, non-thrombogenic additives, non-inflammatory medicines, additives to induce fibrosis for wound closure, anti-platelet, anti-coagulent, growth factors, gene-transductors, cell matrix, glue, cement, protein, hydrophilic, hydrophobic, lipidphillic, lipidphobic, or combinations where appropriate.
The invention also contemplates that the anchor portions described herein may be configured/suited for attachment of external devices/implants/objects/etc. For example, one possible use of the inventive fastener is placing the fastener in the wall of an organ, then attaching an implant to the organ's wall by attaching the implant to the anchor portions of the fastener.
It is contemplated that various methods known in the field may be employed to advance/retract the advancing member. For example, the advancing member may simply push the fastener using a linear or rotary type drive system. Alternatively, the advancing member may be an auger type system that advances the fastener with the assistance of rotatable vanes within the tubular member. A pneumatic, hydraulic, or fluid filled actuation may also be used to advance/retract the advancing member. The advancing member 156 may be a guidewire or other similar type device that is able to deploy the fastener 100 at the operative site. Although not illustrated, the fastener 100 may be removably attached to the advancing member 156 to improve accuracy in deployment of the fastener 100. In some variations of the invention, the fastener 100 is configured relative to the lumen 154 so that friction retains the fastener 100 within the lumen 154 until deployment of the fastener 100. In such cases, the wall surface and/or diameter of the lumen 154 may be selected to increase the sliding resistance of the fastener 100. In any case, the system will be configured so that upon deployment of the first anchor the fastener 100 will release from the device rather than pulling out of the tissue.
The system 150 also includes a distal portion 158 located at the distal end of the system 150. The distal portion 158 has a distal tip 160 configured to pierce tissue and has an opening 162 through which the fastener 100 exits the device. In some variations of the invention, the distal tip 160 is configured to prevent “coring” of the tissue to minimize the size of any opening created during deployment of the fastener. Instead, the tip 160 configuration has a sharpened area and a taper proximal to the sharpened area so that the tip 160 makes a small puncture and then dilates the opening in the tissue.
Although the fastener of the present invention may be delivered through any tubular device such as a cannula, a catheter, polymeric tubing, etc., the fastener may be part of a fastening system that permits deployment of the fastener in remote parts of the body through a variety of minimally invasive procedures. In such cases, the system may include a steerable catheter, or the system may be guided to the site via a separate catheter, a separate steerable catheter, a endoscope-type device, pre-shaped catheter, etc.
As discussed herein, upon deployment of the fastener 100 from the system 150, the fastener 100 portions shall increase in size from the first state to a second state where the larger size may be achieved by an increase in volume and/or profile a portion of the fastener or the entire fastener. The invention contemplates that the fastening delivery system 150 may be used to constrain the fastener 100 into the first state, via a compression mechanism. Alternatively, or in combination, the fastener 100 or portions of the fastener may be configured to increase in size given the application of a fluid. The fluid may comprise naturally occurring bodily fluid or fluid delivered by the fastening system or even fluid delivered via a separate device.
As discussed above, one of the functions of the inventive tissue fastener is to retain two pieces of tissue together, retain an implant to the tissue, or close an opening in tissue. The feature of the inventive fastener 100 relating to expansion of the anchor portions 102 104 permits placement of the fastener 100 using an opening in the tissue that is smaller would otherwise be required. Moreover, fasteners of the present invention may also be configured such that the central portion 106 expands into a second state as well. In such variations, expansion of the center portion may allow for expedited healing of the opening in tissue, or for closure and sealing of the opening in the tissue. In additional variations of the invention, the central portion 106 may be configured from a material that allows stretching of the center portion 106 during deployment. As shown in
In the illustrated variation, the opening 162 is located in a side wall of the distal portion 158. However, as discussed herein, the opening may be at the distal tip 160. It is contemplated that the tubular member 152 will have sufficient column strength to allow for penetration of tissue via advancement of the system 150. Accordingly, the tubular member 152 may be constructed of a material that provides sufficient flexibility and column strength. Alternatively, the tubular member 152 may include a reinforcing member 166, such as a coil, braid, or fiber reinforcement. Furthermore, as discussed above, the system 150 includes an advancing member 156 that permits advancement and/or deployment of the fastener 100. To improve advancement and deployment of the fastener, the tubular member and/or advancing member may be selected from materials that minimize the friction between the two members. Alternatively, or in combination, these items may include a lubricious coating to minimize friction. Although not illustrated, the system 150 may include an additional fluid delivery means, such as a fluid source where delivery of the fluid occurs via the lumen of the device, an additional fluid lumen, a separate catheter-type device for delivery of the fluid, etc.