US20060173469A1 - Device and method for suturing of internal puncture sites - Google Patents

Abstract

A suture applying device comprises a shaft having a nose piece attached at its distal end. The shaft and the nose piece are separated by a transition region, and a needle entry lumen in the shaft permits a flexible needle to be introduced in the distal direction. The needle is able to cross the transition region and penetrate tissue held therein and enter into a return lumen in the nose piece. The return lumen is U-shaped and acts to bend the flexible needle as it is advanced. In this way, the needle passes from the nose piece through the transition region in a proximal direction, and is able to pass through tissue within the transition region generally on the opposite side of a tissue puncture from the first suture passage. The needle then exits from the device, permitting the suture attached to the needle to be drawn fully through the device. The suture may then be tied in order to close and seal the tissue penetration.

Description

BACKGROUND OF THE INVENTION
• 1. Field of the Invention
• The present invention relates generally to devices and methods for the percutaneous closure of body lumens. More particularly, the present invention relates to devices and methods for the percutaneous closure of arterial and venous puncture sites, which are usually accessible only through a tissue tract.
• A number of diagnostic and interventional vascular procedures are now performed transluminally, where a catheter is introduced to the vascular system at a convenient access location and guided through the vascular system to a target location using established techniques. Such procedures require vascular access which is usually established using an introducer sheath according to the well known Seldinger technique, as described, for example, in William Grossman's “Cardiac Catheterization and Angiography,”3rdEd., Lea and Febiger, Philadelphia, 1986, incorporated herein by reference.
• When vascular access is no longer required, the introducer sheath must be removed and bleeding at the puncture site stopped. One common approach for achieving hemostasis (the cessation of bleeding) is to apply external force adjacent to and upstream from the puncture site, typically by manual or “digital” compression. This approach suffers from a number of disadvantages. It is time-consuming, frequently requiring one-half hour or more of compression before hemostasis is assured. It is uncomfortable for the patient and frequently requires administering analgesics to be tolerable. Moreover, the application of excessive pressure can at times totally occlude the underlying blood vessel, resulting in ischemia and/or thrombosis. Following manual compression the patient is required to remain recumbent for at least six and at times as long as eighteen hours under close observation to assure continued hemostasis. During this time renewed bleeding may occur resulting in bleeding through the tract, hematoma, and/or pseudoaneurism formation as well as arteriovenous fistula formation. These complications may require blood transfusion and/or surgical intervention. The incidence of these complications increases when the sheath size is increased and when the patient is anticoagulated. It is clear that the standard technique for arterial closure can be risky and is expensive and onerous to the patient. While the risk of such conditions can be reduced by using highly trained individuals, such use is both expensive and inefficient.
• To overcome the problems associated with manual compression, the use of bioabsorbable fasteners to stop bleeding has been proposed by several groups. Generally, these approaches rely on the placement of a thrombogenic and bioabsorbable material, such as collagen, at the superficial arterial wall over the puncture site. While potentially effective, this approach suffers from a number of problems. It can be difficult to properly locate the interface of the overlying tissue and the adventitial surface of the blood vessel, and locating the fastener too far from that surface can result in failure to provide hemostasis and subsequent hematoma and/or pseudo aneurism formation. Conversely, if the fastener intrudes into the arterial lumen, intravascular clots and/or collagen pieces with thrombus attached can form and embolize downstream causing vascular occlusion. Also, thrombus formation on the surface of a fastener protruding into the lumen can cause a stenosis which can obstruct normal blood flow. Other possible complications include infection as well as adverse reactions to the collagen implant.
• For these reasons, it would be desirable to provide improved devices and methods to close and seal body lumen puncture sites. It would be particularly desirable to provide percutaneous devices and methods for suturing the puncture sites required for percutaneous vascular procedures.
• 2. Description of the Background Art
• Devices capable of delivering needles to various tissue locations are described in the following patents and patent applications: U.S. Pat. Nos. 4,493,323 and 659,422; European patent application 140 557; and U.S.S.R patent applications 1174-036-A and 1093-329-A. Other suturing and ligating devices are described in U.S. Pat. Nos. 3,665,926; 2,959,172; and 2,646,045. Devices for sealing percutaneous vascular penetrations using various plug and fastener structures are described in U.S. Pat. Nos. 5,222,974; 5,192,302; 5,061,274; 5,021,059; 4,929,246; 4,890,612; 4,852,568; 4,744,364; 4,587,969; and 3,939,820. Collagen fastener sealing devices are under commercial development by Datascope Corp., Montvale, N.J., and Kensey Nash Corporation, Exton, Pa. U.S. Pat. No. 4,161,951, describes a needle driver to facilitate surgical suturing. U.S. Pat. No. 4,317,445, discloses a catheter having an axial lumen which provides an indication of blood flow when the catheter has been successfully introduced to the vascular system. A brochure entitled “Innovation Through Progress” published by REMA-Medizintechnik GmbH, Durbheim-Tuttlingen, Germany, describes a suturing device which carries a pair of needles with a length of suture extending therebetween at its distal end. Features of the REMA-Medizintechnik suturing device appear to be described inDE 42 10 724. A device and method for the suturing of vascular penetration sites are described in copending application Ser. No. 07/989,611, commonly assigned with the present application.
SUMMARY OF THE INVENTION
• The present invention provides devices and methods for suturing tissue penetrations and puncture sites and is particularly useful for the suturing of puncture sites distal to a tissue tract, such as punctures formed in blood vessels to provide vascular access. Devices according to the present invention will comprise a needle-guiding device including a shaft having a proximal end and a distal end and will define a needle path having an entry segment, a return segment, and an exit segment. Using such devices, elongate flexible needles may be guided through tissue on either side of a puncture site by pushing on the needle from the entry segment. The needle will then pass through tissue captured in a gap or transition region between the entry segment and the return segment. The needle is resiliently flexed (elastically deformed) to turn back on itself as it passes through the return segment of the needle path and is thus directed proximally into the exit segment. The needle thus also passes through tissue captured in the gap between the return segment and the exit segment, permitting suture to be drawn by the needle through opposed sides of the puncture site. The suture may then be tied off to close the puncture in a conventional manner.
• According to a first aspect of the method of the present invention, the elongate flexible needle is provided and pushed inwardly so that its distal tip penetrates through an anterior surface of the wall of a body lumen adjacent a puncture site. The flexible needle is then resiliently flexed (elastically deformed) as it travels within the interior of the body lumen so that the distal tip will penetrate proximally (outwardly) through a posterior surface of the luminal wall adjacent the puncture site. As it emerges from the device, the needle straightens and may be pulled outwardly to draw suture through the needle penetrations thus formed on opposite sides of the puncture, and the suture tied off to close the puncture site.
• According to a second aspect of the method of the present invention, both the elongate flexible needle and a needle-guiding device are provided. The needle-guiding device defines the needle path having an entry segment, a return segment, and an exit segment. The needle-guiding device is first introduced through a tissue tract so that a gap between the entry/exit segments and the return segment lies at the puncture site. After the needle-guiding device is in place, the flexible needle may be pushed through the entry segment of the needle path so that the needle first passes through tissue adjacent the puncture site and into the return segment of the needle path. The needle is then turned as it advances through the return segment so that it passes outwardly through tissue on the other side of the puncture site and then into the exit segment. The needle is pushed sufficiently far so that the distal end of the needle emerges from the exit segment of the needle path where it may be manually grasped and pulled from the needle-guiding device. The suture is then released from the device, the device withdrawn, and the suture tied to close the puncture site.
• In a first aspect of the device of the present invention, the suturing device comprises a needle-guiding device including a shaft having a proximal end, a distal end, an entry lumen, and an exit lumen. A nose piece is attached to the distal end of the shaft and includes a return lumen disposed to receive the flexible needle from the entry lumen and to turn the needle to enter the exit lumen as the needle is advanced from the entry lumen. A gap between the shaft and the nose piece receives the tissue to be sutured and exposes the tissue to passage of the suturing needle.
• Typically, the nose piece will be elongated with a tapered distal tip and will have a circular cross-section having a maximum peripheral length which is generally equal to that of a transition region which defines a tissue-receiving gap between the nose piece and the shaft. In a preferred embodiment, the nose piece will be fixed relative to the shaft. In an alternate embodiment, the nose piece will be rotatable relative to the shaft. In either case, it will be necessary for the nose piece to align the entry and exit ports of the return lumen to receive the needle from the entry lumen and direct the needle to the exit lumen.
• In another aspect of the device of the present invention, guide tubes are provided together with a mechanism to selectively extend the guide tubes across the tissue-receiving gap between the entry lumen and the entry port of the return lumen and between the exit port of the return lumen and the exit lumen. The needle guide tubes help assure that the flexible needles will not become misaligned during passage through tissue across the gap between the shaft and the nose piece.
• In another particular aspect of the present invention, the device further comprises a drive wheel on the shaft disposed to engage a flexible needle present in the entry lumen. In this way, even very flexible needles (lacking substantial column strength) can be advanced through the entry lumen to the return lumen and subsequently to exit lumen. The present invention still further provides a suturing kit including a needle-guiding device, as described above, in combination with a flexible needle attached to a length of suture. The needle will have a length sufficient to permit its introduction through the entry lumen, return lumen, and exit lumen, so that the needle may be advanced by pushing on the needle within the entry lumen until a distal end of the needle emerges from the exit lumen. In this way, a user can advance the needle entirely through the needle-guiding path, and grasp the needle once it is emerged from the exit lumen, either manually or using hemostats. Preferably, the needle will be from 10 cm to 30 cm in length. The needle may then be withdrawn from the needle-guiding device and the suture released from the device. After the device is withdrawn from the tissue tract, the suture may be tied off in a conventional manner.
• The present invention further comprises kits including the needle guiding device, the needle, and suture. Conveniently, all three components can be packaged together in sterile packaging, such as a sterile flexible pouch.
• The devices and methods of the present invention are useful wherever it is desired to place a tied suture loop to close a tissue puncture site, particularly a puncture site through the wall of a body lumen, and more particularly a percutaneous vascular puncture site at the distal end of a tissue tract. The devices and methods can achieve closure wholly within the tissue tract leading to a puncture site and can be manipulated entirely from the portion of the device lying outside of the tissue tract. The present invention will find its greatest use in the sealing of a femoral artery cannulation site made in connection with percutaneous transluminal procedures such as angiography, angioplasty, atherectomy, laser ablation, stent placement, intravascular drug delivery, intravascular imaging, and the like. The present invention will also find use in other medical procedures which rely on percutaneous access to hollow body organs and lumens, such as laparoscopic procedures, endoscopic procedures, artheroscopic procedures, and the like.
BRIEF DESCRIPTION OF THE DRAWINGS
• FIG. 1 is a perspective view of a suturing device constructed in accordance with the principles of the present invention.
• FIG. 1A illustrates a flexible suturing needle attached to a length of suture, which needle and suture may be introduced using the suturing device ofFIG. 1.
• FIG. 1B illustrates an alternative distal end configuration for the suturing device ofFIG. 1.
• FIG. 2 is an elevational view of the suturing device ofFIG. 1, with portions broken away.
• FIG. 3 is a detailed view of the distal end of the suturing device ofFIG. 1, with portions broken away.
• FIG. 3A is a cross-sectional view taken alongline3A-3A ofFIG. 3.
• FIG. 3B is a cross-sectional view taken alongline3B-3B ofFIG. 3.
• FIG. 4A is a detailed view similar toFIG. 3, illustrating the release of suture from the distal end of the device.
• FIG. 4B is a cross-sectional detail ofFIG. 4A illustrating a suture-release slot of the present invention.
• FIGS. 5A-5C illustrate the suturing device in its initial configuration prior to extension of needle guide tubes and advancement of a suturing needle.
• FIGS. 6A-6C illustrate the suturing device in an intermediate configuration after the needle guide tubes have been advanced but prior to advancement of the suturing needle within the needle guide path.
• FIGS. 7A-7C illustrate the suturing device with the needle guide tubes advanced and the suturing needle partially advanced through the needle guide path by a needle drive wheel.
• FIG. 8 is a detailed view illustrating the distal end of the needle-guiding device placed within a puncture in the femoral artery prior to advancement of the needle guide tubes.
• FIGS. 9-12 illustrate successive steps of advancing the suturing needle within the needle-guide path of the needle-guiding device in detail.
• FIG. 13 illustrates a tied suture loop applied by the device in the method of the present invention.
• FIGS. 14A-14C illustrate an alternative arrangement of the distal end of the needle-guiding device of the present invention, where a rotatable nose piece carrying a pair of return lumens is provided for receiving a pair of needles from the guide shaft.
• FIGS. 15A and 15B illustrate placement of single and double suture loops using the first and second embodiments of the present invention.
• FIGS. 16A and 16B illustrate an alternative suture release mechanism where a portion of the nose piece slides to expose the return lumen.
• FIGS. 17A and 17B illustrates a second alternative suture release mechanism, where a portion of the nose piece swings open to expose the return lumen and release the suture.
DESCRIPTION OF SPECIFIC EMBODIMENTS
• Referring now toFIGS. 1-3,3A, and3B, asuture applying device10 which is suitable for suturing and sealing of a percutaneous vascular puncture site, particularly punctures made to the femoral artery in a patient's groin, will be described. It will be appreciated, however, that the device of the present invention can be readily adapted for use with punctures made to other hollow body organs and lumens, although it may be necessary to modify the dimensions and other particular aspects of the device to accommodate a different usage environment.
• Thesuture applying device10 of the present invention comprises anelongate shaft12 having anose piece14 at its distal end and ahandle16 at its proximal end. The shaft is illustrated as an elongate cylindrical rod having a plurality of axial lumens formed therein, but could also comprise a variety of other geometries which are able to fulfill the essential requirements of the shaft, i.e., defining a needle guide path from its proximal end to its distal end and again back from the distal end to the proximal end. The shaft will usually also include or otherwise define a guide wire lumen (particularly for vascular applications), and a blood pressure detection lumen. Each of these aspects will be described in more detail with regard to the exemplary embodiment ofFIGS. 1-3.
• Shaft12 includes aneedle entry lumen18 terminating at aneedle exit port20 at its distal end and aneedle exit lumen22 which begins with aneedle entry port24 at its distal end. Theshaft12 further includes aguide wire lumen26 which extends through thenose piece14 and a bloodpressure detection lumen28 having ablood inlet port30 at its distal end. Theblood inlet port30 is located within a transition (gap-defining)region32 between thenose piece14 andshaft12, as will be described in more detail hereinafter.
• Thenose piece14 includes aneedle return lumen36 which is preferably a U-shaped lumen having aneedle entry port38 aligned withneedle exit port20 of theneedle entry lumen18 and aneedle exit port40 aligned withneedle entry port24 of theneedle exit lumen22. In this way, a flexible needle42 (FIGS. 1A and 3) entering through theentry lumen18 will be able to pass across the gap defined by thetransition region32 and into the needle return lumen36 (in some cases through a needle guide tube as described in connection withFIG. 3 hereinafter) where its direction of travel will be reversed from the distal direction to the proximal direction. Theneedle42 will then emerge from theneedle exit port40 ofreturn lumen36 and be able to enter theneedle exit lumen22 through alignedneedle entry port24. Thus, tissue disposed intransition region32, i.e., the gap between the distal end ofshaft12 and the proximal end ofnose piece14, will be penetrated by theflexible needle42 on opposite sides of a puncture site, as will be described in greater detail hereinafter.
• In the suturing of a puncture site in the wall of a body lumen, and in particular the wall of a blood vessel, it is desirable to minimize and preferably eliminate any tearing or enlarging of the puncture during the suturing procedure. With the device of the present invention, however, it will also be desirable to distend the periphery of the puncture so that its edges are extended along an axis transverse to that of the blood vessel. In this way, opposed edges of the puncture will be exposed to the needle as it passes through thetransition region32 between thenose piece14 and theshaft12. In order to simultaneously achieve both these objectives, i.e., distending the edges of the puncture without tearing, and further provide anose piece14 having sufficient size to space the entry and exit ports of thereturn lumen36 sufficiently far apart to be aligned withneedle ports20 and24, the geometry of thenose piece14 and of thetransition region32 are selected to properly configure and conform the edges of the luminal puncture as thesuture applying device10 is introduced therethrough.
• In particular, thenose piece14 will be tapered from a small-diameter, generally circulardistal tip50 to a proximal portion orlength52 having a generally oval configuration, as best illustrated inFIGS. 3 and 3A. In the illustrated embodiment, thenose piece14 is generally conical until acircular junction53 is reached. Theproximal portion52 of the tip makes a transition from a circular cross-section at53 to an oval cross-section at55. The particular dimensions of the tip will be selected based on the intended use of thedevice10. For the suturing and sealing of the femoral artery, thedistal tip50 will typically have a diameter from about 0.25 mm to 1 mm, typically being just large enough to receive the guide wire GW into theguide wire lumen26. The maximum dimensions of the oval-shaped proximal portion at55 will be in the range from 2 mm to 4.5 mm (major diameter) and in the range from 1 mm to 2.25 mm (minor diameter). In particular the major diameter will be selected to permit theneedle entry port38 to be sufficiently spaced-apart from theneedle exit port40 to provide a desired distance between the entry and exit penetrations of the suturing needle through the tissue surrounding the luminal puncture. The oval cross-section of theproximal end55 of theproximal portion52 is thus desirable since it minimizes the total peripheral length about the nose piece which must pass through the luminal wall puncture while maximizing the distance between theentry port38 andexit port40, as just described. In this way, proper spacing of the needle passages through the tissue will be provided with minimum stretching or enlargement of the luminal penetration.
• The geometry of thetransition region32 will also be chosen to provide for proper manipulation and positioning of the tissue surrounding the luminal puncture site with minimum distending (and preferably no tearing) of the edges of the puncture site. In the embodiment ofFIGS. 1-3, thetransition region32 will conform at its distal end to the oval shape of theproximal end55 of theproximal portion52 ofnose piece14. The cross-sectional orientation of thetransition region32 changes in the proximal direction, eventually becoming an oval57 having its major axis disposed orthogonally (i.e. at 90°) relative to the major axis of theproximal portion52 of nose piece14 (FIG. 3B). The oval cross-section of thetransition region32 will rotate 90° from the position at55 to the position at57. That is, the peripheral shape and distance will remain constant, but the orientation of the major axis will turn through 90° over the axial length of the transition region. By maintaining a constant total peripheral length around the transition region at all points (e.g., equal to the outer diameter of the introducer sheath which had been used in performing the intravascular procedure and removed prior to suturing), the luminal penetration is held firmly and turned to the desired orientation without further distending or tearing.
• Analternative nose piece15 configuration for thesuturing device10 is illustrated inFIG. 1B. Thenose piece15 comprises a tapereddistal tip51, a generallycylindrical shank portion53, and aproximal portion55A (which is similar to theproximal portion52 of the previous embodiment). Aneedle return lumen59 is formed in theproximal portion55A and is generally identical to thelumen42 described above. Thenose piece15 will be longer than thenose piece14, typically having a length in the range from 15 cm to 30 cm, usually about 20 cm. The purpose of thelonger nose piece15 is to allow thesuturing device10 to be partially withdrawn from the luminal puncture. By partially withdrawing thedevice10, the suture can be released from the nose piece, and the suture partly tightened prior to total withdrawal of the device. In this way, the puncture can be at least partly closed by the suture prior to removal of the device, and hemostasis can be maintained to limit blood loss prior to complete closure of the puncture.
• Usually, both the tapereddistal tip51 and theshank53 will have circular cross-sections, with the peripheral length of the shank being uniform along its length and generally equal to the maximum peripheral length of the nose piece, usually having a diameter equal to that of the introducer sheath which had previously been in place in the puncture. Theproximal end portion55 serves as a transition from the circular peripheral shape of theshank53 to anoval transition region59, which will generally be identical to thetransition region32 indevice10.
• The remaining description herein will refer specifically todevices10 having thenose piece14 illustrated inFIGS. 1, 2,3, et seq, but it will be appreciated that such description applies as well to devices incorporatingnose piece15.
• The suturingneedle42 and attachedsuture62 are illustrated in detail inFIG. 1A. Suturingneedle42 will be formed from a highly flexible material which will be able to pass through the radius ofreturn lumen36. Typically, the turn radius will be in the range from about 1 mm to 2.25 mm, and theneedle42 will have to be able to pass through this radius without undergoing substantial permanent (non-elastic) deformation which would cause binding or jamming as the needle passes outward from thereturn lumen42. Preferably, theneedle42 will be formed from stainless spring steel or a superelastic material, typically nickel titanium alloy. Preferred superelastic nickel titanium alloys are available commercially from suppliers, such as Shape Memory Applications, Sunnyvale, Calif., Innovative Technologies International, Beltsville, Md. and Fort Wayne Metals, Fort Wayne, Ind. The diameter of the needle will typically be from about 0.2 mm to 0.5 mm, and the length will be sufficient to permit the needle to be advanced through theentry lumen18, across thereturn lumen36, and outward through theexit lumen20, while the needle is being pushed from a location at or near the proximal end of the entry lumen. Typically, the needle will have a length in the range from about 10 cm to 30 cm, preferably in the range from about 15 cm to 20 cm. The needle will be attached to a length of suture, typically from about 50 cm to 100 cm, usually at the proximal end of the needle. Particular methods for forming needles and attaching needles to suture are well known in the art.
• Referring now toFIGS. 4A and 4B, in a preferred embodiment of the present invention, suture62 (FIG. 1A) will be released from thenose piece14 through a suture-release slot60. Theneedle return lumen36 innose piece14 will have a diameter which is large enough to receive theflexible needle42 with a clearance in the range from 0.03 mm to 0.1 mm. The width of the suture-release slot60, however, will be less than the diameter of theflexible needle42, typically from 0.1 mm to 0.35 mm. In this way, the needle will travel through thereturn lumen36 and will not be able to escape through the suture-release slot60.Suture62 which is attached to the butt end of theflexible needle42 will be sufficiently small to pass through the suture-release slot60. Thus, after theneedle42 has passed entirely through theneedle return lumen36 and into theneedle exit lumen22 inshaft12, thesuture62 will pass out of thenose piece14 through thesuture release slot60, as illustrated in steps (1), (2), and (3) inFIG. 4A. Thesuture62 will thus directly engage the posterior side of the tissue to be sutured, leaving thenose piece14 free to be withdrawn through the luminal puncture without entanglement with thesuture62.FIG. 4B illustrates a proximal or trailingend64 of theflexible needle62 as it passes through theneedle return lumen36. As can be seen, thesuture62 passes into the suture-release slot60 as it is drawn through thereturn lumen36 by theneedle42. Alternative suture-release mechanisms will be described in connection withFIGS. 16A, 16B,17A, and17B, hereinafter.
• In a preferred aspect of the present invention, thenose piece14 will include asoft tip66 to facilitate entry into the body lumen being sutured. Conveniently, thesoft tip66 can be formed from a soft polymer, such as a polyether block amide, e.g., Pebax®. Thesoft tip66 can be joined to the more rigid proximal portion of thenose piece14 by any conventional manner. In all other ways, the soft tip can form a continuous structure with the proximal portion of thenose piece14. The proximal portion ofnose piece14, thetransition region32, and theshaft12, will typically be formed from a relatively rigid polymer (e.g., polycarbonate) or a metal (e.g., stainless steel) by conventional methodologies, such as extrusion, molding, machining and the like. The different portions of the device may be formed in separate pieces, and joined later, e.g. by the use of adhesives, heat bonding, mechanical attachment, or the like.
• Referring now toFIGS. 1, 2, and5A-5C, a needle guide and advancement mechanism constructed in accordance with the principles of the present invention will be described. The needle guide and advancement mechanism includes anentry guide tube70 and anexit guide tube72, each being secured at its proximal end in aguide tube yoke74. Theguide tubes70 and72 are slidably received in theneedle entry lumen18 andneedle exit lumen22, respectively, so that axial translation of the guide tube yoke74 (as described hereinafter) can advance the distal ends of the guide tubes across the gap defined by the transition region32 (as illustrated inFIG. 3 and described in more detail in connection withFIG. 6A-6C). Theguide tube yoke74, in turn, is slidably mounted in aspring retainer76, with aspring78 being disposed therebetween. As illustrated inFIGS. 5A and 5B,spring78 is in compression, with the entire assembly of theguide tubes70 and72 and guidetube yoke74 being in a retracted configuration, i.e. fully to the left inFIGS. 5A and 5B.
• A yoke-release mechanism comprises athumb lever80 extending fromhandle16 and alatch member82 which captures theguide tube yoke74 through anextension84. Thethumb lever80 andlatch member82 are pivotally mounted within the handle and are operatively connected through a pin and slot86 so that depression ofthumb lever80 in the direction ofarrow88 will release the guidetube yoke extension84, as illustrated inFIG. 6A-6C. In this way,spring80 will decompress to translate theguide tube yoke74 distally, i.e. toward the right, as illustrated inFIGS. 6A-6C.
• Theentry guide tube70 will carry theflexible suture needle42 with a sharpeneddistal tip90 projecting just out of the distal end of the tube, as illustrated inFIGS. 5A and 5C. In this way, theneedle42 will fill the lumen of theguide tube70 and prevent tissue from entering the lumen as the guide tube is advanced. Theexit guide tube72 will have a stylet92 (or other obturator) filling its axial lumen. As illustrated inFIGS. 5A and 5C, thestylet92 will preferably also have a sharpeneddistal tip94 which projects outwardly from the distal end of the guide tube as the guide tube is advanced. The purpose of thestylet92 is to prevent tissue from entering (and blocking) lumen ofguide tube72 as it is advanced through the tissue. After theexit guide tube72 has been advanced across thetransition region32, thestylet92 will be withdrawn leaving the lumen of the guide tube open and available for advancement and passage of theflexible needle42, as will be described in greater detail in connection withFIGS. 7A-7C.
• Referring now in particular toFIGS. 1, 2, and5A-5C, the exemplary needle guide and advancement mechanism for use with the device of the present invention further comprises adrive wheel100 rotatably mounted inyoke102. Theyoke102, in turn, is attached to the interior ofhandle16 on aspring mount104.Spring mount104 urges thedrive wheel100 againstflexible suture needle42 in a manner described more fully in connection withFIG. 6A-6C. Preferably, theperiphery106 of thedrive wheel100 is serrated or otherwise roughened to enhance frictional coupling between the drive wheel and theneedle42 to facilitate advancement.
• Drive wheel100 is driven by arack110 which engagespinion gear112 which is coaxially mounted and attached to the drive wheel. Therack110, in turn, is actuated by alever114 which is pivotally attached to thehandle16. A mechanism (not illustrated) will usually be provided for biasing therack110 against thepinion gear112. For example, a leaf spring could be provided within the yoke to upwardly bias therack110 against thepinion gear110. Alternatively, a torsion spring could be provided at thepivot116 connecting therack110 to thelever114.
• Thedrive wheel100 is actuated by manually squeezing thelever114 toward thehandle16 in the direction ofarrow118. It will be possible to select the relative diameters of thedrive wheel100 and thepinion gear112 and the length and pivot point of the rack so that a single stroke of thelever114 can fully drive the needle through the target tissue,return lumen36, andneedle exit lumen22, so that the needle can be manually grasped or mechanically captured, e.g., using hemostats, as it emerges from the exit lumen. Alternatively, a mechanism (not illustrated) could be provided to permit multiple, sequential actuation of thelever114 in order to drive the needle the requisite distance.
• Thesuture applier10 is illustrated in its “shelf” configuration inFIGS. 2 and 5A-5C. That is, theneedle guide tubes70 and72 are fully retracted, i.e. drawn to the left in each of these figures. By depressingthumb lever80, the user releases theguide tube yoke74, thus driving the guide tubes in the distal direction as indicated byarrows120 inFIG. 6A. Such movement of theentry guide tube70 aligns anelongate cutout122 in the guide tube with the periphery ofdrive wheel100, as best illustrated inFIG. 6B. In this way, thedrive wheel100 directly engages the side of thesuture needle42 which is exposed through thecutout122. At this moment, the guide tubes will also extend across thetransition region32 and seat into thereturn lumen36 in thenose piece14. Thestylet92 may then be withdrawn in order to open the lumen of theexit guide tube72 so that it is free to receive the suture needle.
• After thestylet92 is withdrawn, theneedle42 may be advanced by the needle advance mechanism, as illustrated inFIG. 7A-7C. Thelever114 is manually closed in the direction ofarrow130 to translaterack110 across thepinion gear112. This motion causesdrive wheel100 to rotate clockwise in the direction ofarrow132. As thedrive wheel100 is engagingsuture needle42 through thecutout122, the needle will be moved in the distal direction (arrow134) causing the sharpenedtip90 to advance and cross the gap defined by transition region (arrow136), through thereturn lumen36 and back through the transition region gap (arrow138). The needle advancement mechanism will be actuated sufficiently (or for a sufficient number of times) to advance theneedle42 so that itsdistal end90 emerges from the proximal end of thedevice10, as illustrated in broken line inFIG. 7A. The needle may then be grasped or captured and withdrawn from thedevice10 in order to draw the suture through the device and the tissue to be sutured, as will be described in more detail hereinafter.
• It would also be possible to modify thedrive wheel100 advance mechanism to engage and advance theguide tube70 so that the guide tube could be advanced by an initial portion of the stroke oflever114.Guide tube70 could be coupled to guidetube72 through a yoke similar to theyoke74, but nospring78 or yoke-release mechanism would be required. A variety of particular mechanisms for advancing the guide tubes and/or needles would be available within the scope of the present invention.
• Referring now toFIG. 8-13, use of thedevice10 for applying end tying a suture loop in a blood vessel BV wall will be described in detail. Referring in particular toFIG. 8, thedevice10 is introduced through an existing tissue tract T, typically formed by an introducer sheath which has been previously placed in connection with a conventional intravascular therapeutic or diagnostic procedure, such as angiography, angioplasty, atherectomy, laser ablation, cardiac mapping, cardiac ablation, or the like. The introducer sheath is removed prior to introduction of thenose piece14 of thesuturing device10. As discussed above, the maximum peripheral length of thenose piece14 will generally be the same as the circumferential length of the introducer sheath so that the penetration is not torn but remains blocked or occluded by the device to reduce blood loss.
• Thedevice10 is introduced with theneedle guide tubes70 and72 fully retracted in the proximal direction and with thestylet92 in place in the lumen of theexit guide tube72. Thedevice10 is positioned over the previously placed guide wire GW and introduced sufficiently so that the gap defined by thetransition region32 receives the edges of the puncture P. Conveniently, proper positioning of thedevice10 can be confirmed by detecting the flow of blood intoblood inlet port30 and as it appears at the open proximal end oflumen28.
• After thedevice10 has been properly positioned, as illustrated inFIG. 8, theneedle guide tubes70 and72 will be advanced across the gap defined by thetransition region32, as illustrated inFIG. 9. The needle advancement mechanism, as previously described, will be used to effect the advance. Eachguide tube70 and72 will pass through tissue which is located within thetransition region32. The presence of theflexible needle42 inguide tube70 prevents “coring” of the tissue into theguide tube70. Similarly, the presence ofstylet92 inneedle guide tube72 prevents such coring.
• Thestylet92 is next withdrawn, leaving the lumen of theneedle guide tube72 empty and available to receiveflexible needle42, as illustrated inFIG. 10.
• Theflexible needle42 is next advanced across theU-shaped return lumen36 and into theneedle return guide72, as illustrated inFIG. 11. Note that the highly flexible nature of the needle together with the close fit between the needle, guidetubes70 and72, and returnlumen32, permits it to turn across the small radius and advance with buckling in spite of the frictional and bending forces opposing the needle's advance. The needle continues to be advanced until the sharpeneddistal tip90 emerges from the device10 (as illustrated previously inFIG. 7A). After it emerges, theneedle tip90 may be grasped and pulled through thedevice10, drawing thesuture62 through thereturn lumen36. Theneedle guide tubes70 and72 will be withdrawn, permitting the suture to be drawn outward from the nose piece through the suture-release slot60, as illustrated inFIGS. 4A-4B and12 (where the outer portion ofslot60 is shown broken away). After the suture has been released from thenose piece14, thedevice10 may be partially or totally withdrawn, leaving the suture accessible for tying of a knot K to close the puncture wound, as illustrated inFIG. 13.
• When using adevice10 having anelongated nose piece15, as illustrated inFIG. 1B, it will be preferred to only partially withdraw the device so that theshank portion53 remains within the penetration P. As theshank53 will preferably have a perimeter substantially equal to that of the introducer sheath previously in place, the shank will be able to occlude the puncture to inhibit blood loss, without distending the puncture. The extra length provided byshank53 permits thenose piece15 to be withdrawn sufficiently to release thesuture62 while still occluding the penetration P. The knot K can thus be tied and partially tightened prior to total withdrawal of thedevice10, allowing very rapid closure of the penetration by tightening the suture.
• Referring now toFIGS. 14A-14C an alternative embodiment of anose piece200 is illustrated.Nose piece200 is mounted on anaxial rod202 which permits it to be rotated between an aligned position, as illustrated inFIG. 14B, and a transverse position, as illustrated inFIGS. 14A and 14C. When in the aligned position ofFIG. 14B, the nose piece has an oval cross-section which gradually increases in size and which forms a smooth and continuous surface with thetransition region204, facilitating introduction of the device through a tissue puncture. The peripheral length of the oval section is matched with the circumference of the introducer sheath used in the initial interventional or diagnostic procedure to minimize distending of the tissue around the luminal puncture site. In the configuration ofFIG. 14B, thereturn lumens208 and210, however, are out of rotational alignment with theneedle entry lumens212 and214 andneedle exit lumens216 and218. Therefore, prior to needle advancement, the needle entry and exit lumens will be properly aligned with the needle return lumens in thenose piece200 by rotating thenose piece200 by 90° to the position ofFIGS. 14A and 14C. Thenose piece200 will then be rotated back to the aligned configuration ofFIG. 14B after suture release from thenose piece200 and prior to withdrawal of the device from the tissue tract.
• As can be seen inFIGS. 15A and 15B, the embodiment ofFIGS. 1-7 can be used to form a single suture loop where thenose piece14 has a relatively small peripheral length (as illustrated on the right-hand half of each figure). The embodiment ofFIGS. 14A-14C is particularly useful for forming pairs of suture loops, as illustrated on the left-hand side of each ofFIGS. 15A and 15B. Of course, the embodiment ofFIGS. 1-7 could be readily adapted to place two sutures simultaneously, while the nose cone ofFIGS. 14A-14C could be modified to place only a single suture.
• Referring now toFIGS. 16A and 16B, a first alternative suture release mechanism is illustrated. Anose piece300 includes a slidingcover302 which may be moved from the covered configuration (FIG. 16A) to the uncovered configuration (FIG. 16B) by sliding the cover proximally, as illustrated byarrow304. When the cover is moved proximally,return lumen308 is exposed, permitting thesuture62 to exit from the lumen, as illustrated byarrows310.
• A second suture release mechanism is illustrated inFIGS. 17A and 17B. The mechanism is similar to that illustrated in connection withFIGS. 16A and 16B, except thatcover400 onnose piece402 is pivotally attached to open as illustrated inFIG. 17B.Suture62 can thus be released from thereturn lumen404, as illustrated by thearrows406.
• Although the foregoing invention has been described in detail for purposes of clarity of understanding, it will be obvious that certain modifications may be practiced within the scope of the appended claims.

Claims (53)

1. A method for suturing a puncture site in the wall of a body lumen, said method comprising:

providing at least one elongate flexible needle having a distal tip and an attached length of suture;

pushing the needle so that the distal tip penetrates inwardly through an anterior surface of the wall adjacent to the puncture site and enters into the body lumen, whereby an inward penetration is formed;

elastically bending the needle as it travels within the body lumen so that the distal tip penetrates outwardly through a posterior surface of the wall adjacent to the puncture site, whereby an outer penetration is formed;

pulling the needle outwardly to draw suture through the inward and outward penetrations formed by the needle; and

tying the suture to close the puncture site.

2. A method as inclaim 1, wherein the needle is pushed by engaging a drive wheel against the needle and rotating the drive wheel.

3. A method as inclaim 1, wherein the needle is elastically bent by travelling through a U-shaped guide path.

4. A method as inclaim 1, wherein the needle is pulled from the outward penetration.

5. A method for suturing a puncture site distal to a tissue tract, said method comprising:

providing an elongate flexible needle having a distal tip and an attached length of suture;

providing a needle-guiding device which defines a needle path having an entry segment, a return segment, and an exit segment, wherein the entry and exit segments are separated from the return segment by a gap;

introducing the needle-guiding device through the tissue tract so that the gap lies at the puncture site;

pushing the needle through the entry segment of the needle path so that the needle passes through tissue adjacent the puncture, into the return segment, through tissue on the other side of the puncture site, and then into the exit segment;

pulling the needle outwardly from the exit segment of the needle path to draw suture from the needle-guiding device; and

tying the suture to close the puncture site.

6. A method as inclaim 5, wherein the needle is composed of a superelastic alloy.

7. A method as inclaim 5, wherein the needle-guiding device has a tapered, soft distal end to facilitate introduction through the tissue tract and into puncture site.

8. A method as inclaim 7, wherein the tapered distal end has a generally oval cross-section adjacent the transition region with the return segment being a U-shaped lumen disposed in a plane parallel to the major axis of the oval.

9. A method as inclaim 8, wherein the needle-guiding device includes a transition region in the gap between the entry and exit segments and the return segment, wherein the transition region has a generally oval cross-section with a major axis oriented orthogonally relative to the major axis of the oval portion of the tapered distal end, whereby the puncture site will be conformed to expose tissue adjacent the puncture site within the gap between the entry and exit segments and the return segment.

10. A method as inclaim 9, wherein the maximum peripheral length around the oval cross-section of the tapered distal end is generally equal to the maximum peripheral length around the cross-section of the transition region.

11. A method as inclaim 10, further comprising withdrawing an introducer sheath from the tissue tract prior to introducing the needle-guiding device, wherein the maximum peripheral length is substantially equal to the circumference of the introducer sheath.

12. A method as inclaim 5, wherein the needle-guiding device includes a shank, a transition region, and a nose piece which is rotatable about a longitudinal axis relative to the shank and transition region wherein the entry and exit segments are disposed in the shank and the return segment is disposed in the nose piece, and wherein the nose piece and transition region is a continuous oval surface when the nose piece and transition region are rotationally aligned, further comprising rotating the nose piece out of alignment with the transition region after the needle-guiding device has been introduced in order to align the entry and exit lumens with the return lumen in the nose piece.

13. A method as inclaim 5, further comprising extending needle guide tubes across the gap between the entry and exit segments and the return segment after the needle-guiding device has been introduced through the tissue tract.

14. A method as inclaim 5, wherein the needle is pushed by engaging a drive wheel against the needle and rotating the drive wheel.

15. A method as inclaim 5, wherein the needle is pulled outwardly from the tissue tract.

16. A method as inclaim 5, wherein the needle-guiding device is introduced over a guide wire which is in place in the tissue tract.

17. A method as inclaim 5, wherein the needle-guiding device has an elongated nose piece and the nose piece remains within the puncture site to occlude blood flow after the suture is withdrawn from the suture path until the suture is tied to close the puncture site.

18. A suturing device comprising:

a shaft having a proximal end, a distal end, an entry lumen, and an exit lumen; and

a nose piece attached to the distal end of the shaft and having a return lumen disposed to receive a flexible needle from the entry lumen and to turn the needle to enter the exit lumen, wherein a gap between the shaft and a proximal end of the nose piece receives tissue to be sutured.

19. A suturing device as inclaim 18, wherein the gap between the shaft and the nose piece is defined by a transition region having a generally oval cross-section.

20. A suturing device as inclaim 19, where the nose piece is tapered with an oval cross-section over at least a portion of its proximal length, wherein the maximum peripheral distance around the nose piece at its proximal end is generally equal to that around the transition region.

21. A suturing device as inclaim 20, wherein the nose piece comprises a tapered distal tip, a shank portion having a cylindrical cross-section with a circumference generally equal to the maximum peripheral length, and a proximal end piece which changes to an oval cross-section having a constant peripheral length generally equal to the maximum peripheral length.

22. A suturing device as inclaim 20, wherein the nose piece is fixed relative to the shaft.

23. A suturing device as inclaim 20, further comprising means for rotating the nose piece relative to the shaft and transition region.

24. A suturing device as inclaim 18, further comprising needle guide tubes disposed in the entry and exit lumens and means to extend the guide tubes across the gap and to the return lumen in the nose piece.

25. A suturing device as inclaim 18, further comprising a drive wheel disposed on the shaft to engage a flexible needle present in the entry lumen, whereby rotation of the drive wheel advances the needle through the entry lumen, across the gap, through the return lumen, across the gap, and through the exit lumen.

26. A suturing device as inclaim 18, wherein the nose piece has a suture-release slot formed contiguously with the return lumen.

27. A suturing device as inclaim 18, further comprising means for opening the nose piece to release suture therefrom.

28. A suturing device as inclaim 27, wherein the opening means slides a portion of the nose piece to expose the return lumen.

29. A suturing device as inclaim 27, wherein the opening means swings a portion of the nose piece to expose the return lumen.

30. A suturing device comprising:

a shaft having a proximal end and a distal end; and

means on the shaft for defining a needle path having an entry segment, a return segment, and an exit segment, wherein the entry and exit segments are separated from the return segment by a gap which receives tissue to be sutured.

31. A suturing device as inclaim 30, further comprising means on the shaft for advancing a needle through the needle path.

32. A suturing device as inclaim 30, further comprising means for extending needle guide tubes across the gap between the entry segment and the return segment and between the return segment and the exit segment.

33. A suturing device as inclaim 30, wherein the shaft includes a body portion, a transition region, and a nose piece, wherein the entry and exit segments of the needle path comprise lumens within the body portion, the return segment comprises a U-shaped lumen within the nose piece, and the transition region defines the gap.

34. A suturing device as inclaim 33, wherein the nose piece is fixed relative to the body portion and wherein the nose piece and transition region have similar but orthogonally disposed oval cross-sections.

35. A suturing device as inclaim 33, further comprising means for rotating the nose piece about a longitudinal axis relative to the body portion.

36. A suturing kit comprising:

a suturing needle including an elongate needle shank having a distal tip, said shank being composed of a flexible metal alloy; and a length of suture attached to the needle shank; and

a needle-guiding device including a shaft having a proximal end, a distal end, an entry lumen, and an exit lumen; and a nose piece attached to the distal end of the shaft and having a return lumen disposed to receive the suturing needle from the entry lumen and to turn the needle to enter the exit lumen, wherein a gap between the shaft and the nose piece receives tissue to be sutured.

37. A suturing kit as inclaim 36, wherein the shank of the suturing needle has a length which is sufficient to extend through the entry lumen, return lumen, and exit lumen so that the shank may be pushed from the entry lumen until the distal tip emerges from the exit lumen.

38. A suturing kit as inclaim 37, wherein the shank of the suturing needle has a length from 10 cm to 30 cm.

39. A suturing kit as inclaim 36, wherein the gap between the shaft and the nose piece is defined by a transition region having a generally oval cross-section.

40. A suturing kit as inclaim 39, where the nose piece is tapered with an oval cross-section at its proximal end, wherein the maximum peripheral length around the nose piece is generally equal to that around the transition region.

41. A suturing kit as inclaim 40, wherein the nose piece comprises a tapered distal tip, a shank portion having a cylindrical cross-section with a circumference generally equal to the maximum peripheral length, and a proximal end piece which changes to an oval cross-section having a constant peripheral length generally equal to the maximum peripheral length.

42. A suturing kit as inclaim 31, wherein the nose piece is fixed relative to the shaft.

43. A suturing kit as inclaim 40, further comprising means for rotating the nose piece relative to the shaft and transition region.

44. A suturing kit as inclaim 40, further comprising needle guide tubes disposed in the entry and exit lumens and means to extend the guide tubes across the gap and to the return lumen in the nose piece

45. A suturing kit as inclaim 40, further comprising a drive wheel disposed on the shaft to engage a flexible needle present in the entry lumen, whereby rotation of the drive wheel advances the needle through the entry lumen, across the gap, through the return lumen, across the gap, and through the exit lumen.

46. A suturing kit as inclaim 36, wherein the nose piece has a suture-release slot formed contiguously with the return lumen.

47. A suturing kit as inclaim 36, further comprising means for opening the nose piece to release suture therefrom.

48. A suturing kit as inclaim 47, wherein the opening means slides a portion of the nose piece to expose the return lumen.

49. A suturing kit as inclaim 47, wherein the opening means swings a portion of the nose piece to expose the return lumen.

50. A suturing needle comprising:

an elongate needle shank having a sharpened distal tip, said shank being composed of a superelastic metal alloy; and

a length of suture attached to the needle shank.

51. A suturing needle as inclaim 50, wherein the needle shank has a length in the range from 10 cm to 30 cm.

52. A suturing needle as inclaim 50, wherein the needle shank is composed of a nickel-titanium alloy.

53. A suturing needle as inclaim 50, wherein the needle shank has a proximal end and a sharpened distal tip, and wherein the suture is attached to a proximal end of the shank.

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