US20040199159A1 - Devices and methods for tissue severing and removal - Google Patents

Abstract

The present invention relates to devices and methods that enhance the accuracy of lesion excision, through severing, capturing and removal of a lesion within soft tissue. Furthermore, the present invention relates to devices and methods for the excision of breast tissue based on the internal anatomy of the breast gland. A tissue severing device generally comprises a guide having at least one lumen and a cutting tool contained within the lumen. The cutting tool is capable of extending from the lumen and forming an adjustable cutting loop. The cutting loop may be widened or narrowed and the angle between the loop extension axis and the guide axis may be varied. Optional tissue marker and tissue collector may additionally be provided. A method for excising a mass of tissue from a patient is also provided. The device and method are particularly useful for excising a lesion from a human breast, e.g., through the excision and removal of a part of a breast lobe, an entire breast lobe or a breast lobe plus surrounding adjacent tissue.

Description

CROSS REFERENCE TO RELATED APPLICATIONS
• This application claims priority to U.S. Provisional Patent Application Ser. No. 60/322,634, entitled “Tissue Severing and Removal Devices and Methods,” filed on Sep. 12, 2001 which is incorporated herein by reference in its entirety.[0001]
BACKGROUND OF THE INVENTION
• 1. Field of the Invention[0002]
• The present invention relates generally to devices and methods for severing soft tissue. In particular, the present invention relates to devices and methods that enhance the accuracy of lesion excision, through severing, capturing and removal of a lesion within soft tissue. Furthermore, the present invention relates to devices and methods for the excision of breast tissue based on the internal anatomy of the breast gland.[0003]
• 2. Description of Related Art[0004]
• Surgery plays an important role in the diagnosis and treatment of cancer. In the case of breast cancer, surgery comprises a critical component of medical care where early diagnosis and treatment have demonstrated a significant improvement in survival.[0005]
• Currently the surgical treatment of a breast cancer does not consider anatomical boundaries within the breast tissue. Anatomical boundaries are, however, important in considering the mechanism of cancer spread within the breast. The breast consists of 15 to 20 lobes that begin centrally beneath the nipple-areolar complex and extend in a radial pattern to the periphery of the gland. Milk is produced in numerous small lobules that connect to one or more main ducts within the lobe. Breast cancer begins in the epithelial cells that line the smaller branching ducts entering the lobules. The cancerous cells may multiply and spread within the ducts of the involved lobe and/or may multiply and form a defined mass. Cancerous spread within the ducts is not appreciated by mammography unless microcalcifications are present. Extension within the ducts may also be missed on pathological examination of the specimen unless a sample is taken exactly at the level of the involved duct. Using current methods of lumpectomy and examination of the specimen, these limitations may lead to inadequate surgical treatment of the cancer.[0006]
• An ultrasound examination of the internal breast anatomy as described in U.S. Pat. No. 5,709,206 to Teboul, can be utilized to study the lesion and its relation to the lobe in which it is developed. By using axial ductal ultrasound scanning, identification of the affected lobe, lesion size, position within the lobe, and the possibility of other lesions within the affected lobe (e.g. multifocal cancer), and/or spread within the ducts can be delineated prior to surgical treatment.[0007]
• A number of patents and publications describe excisional devices designed to remove lesions particularly from within the breast. For example, U.S. Pat. No. 6,022,362 to Lee et al. describes an excisional biopsy device for breast tissue, the device employing a tubular member having a window. A portion of the cutting tool is configured to selectively bow out of and to retract within the window. In operation, the biopsy device is inserted into soft tissue and rotated while the cutting tool is selectively bowed away from the tubular member thus severing tissue for biopsy. A tissue collection bag that is externally affixed to the tubular member may be employed to collect the severed tissue. The window is of fixed length thereby limiting the size of the excised specimen. This limits the size of lesions that can be effectively excised as a single specimen and, in addition, an entire lobe of the breast cannot be excised using this device.[0008]
• U.S. Pat. No. 6,267,759 to Quick describes a cutting loop attached to a rotatable shaft. The cutting loop energized by radio frequency energy may be fashioned to form different shapes, however, there is no mechanism to adjust the size of the cutting loop. This limits the size of lesions that can be effectively excised as a single specimen and does not allow this device to excise an entire lobe.[0009]
• U.S. Pat. No. 6,331,166 B1 to Burbank et al. describes a tissue acquisition system that includes radio frequency cutter loops which are extendible out of a cannula to cut cylindrical tissue samples. The cutter loops are also of fixed diameter thereby limiting the size of the lesion that can be excised as a single specimen and does not allow the device to excise an entire lobe.[0010]
• Accordingly, there is a need for a surgical excisional device that can accurately excise a lesion as a single tissue specimen, that can adapt to lesions of different sizes by varying the size of the cutting mechanism, and that can capture and remove the specimen through a small incision. The device should minimize scarring to the remaining breast tissue by including within the specimen only the necessary amount of surrounding normal breast tissue required to obtain adequate margins. The method of severing and retrieving the sample of tissue should be performed in a manner that minimizes the risk of cancer cell dissemination. Further, there is a need for a therapeutic surgical device and/or method of treatment of breast cancer, that accurately excises part of a lobe, an entire lobe or more than an entire lobe as a single specimen.[0011]
SUMMARY OF THE INVENTION
• The present invention relates to devices and methods that enhance the accuracy of lesion excision, through severing, capturing and removal of a lesion within soft tissue. Furthermore, the present invention relates to devices and methods for the excision of breast tissue based on the internal anatomy of the breast gland. It should be appreciated that the present invention can be implemented in numerous ways, including as a process, an apparatus, a system, a device, or a method. Several inventive embodiments of the present invention are described below.[0012]
• The devices and methods described herein are preferably adapted to accurately and safely excise a mass of tissue from the breast or other soft tissue as a single specimen and with minimal invasiveness. The amount of tissue excised is variable and preferably not limited by the mechanism of the device. Further, the devices and methods improve the accuracy of positioning the device with respect to the lesion.[0013]
• The devices and methods facilitate safe capture and removal of the severed tissue from the body to minimize potential cancer cell dissemination. Moreover, the devices and methods are adapted to accurately and safely excise part of a lobe of a breast, the entire lobe or more than the entire lobe for therapeutic surgical treatment of breast cancer. Optionally, the devices and methods provide for marking or labeling the specimen in vivo to enable specimen orientation once removed from the body.[0014]
• According to a preferred embodiment, a tissue severing device generally comprises a guide, a cutting tool contained within the guide and capable of forming a cutting loop extending from the guide and having a loop extension axis defined by the direction in which the cutting loop extends, and an extension means for controlling the degree to which the cutting loop extends from the guide. The guide comprises two co-linear, co-extensive guide lumens longitudinally extending from a proximal region to a distal terminus along a guide axis and the guide lumens have co-extensive distal segments terminating in distal tips from which the cutting loop extends. The angle of each distal segment in relation to the guide axis is generally fixed.[0015]
• The distal tips may be at a generally fixed distance therebetween such that the width of the cutting loop when the cutting loop is extended is generally fixed. Alternatively, the device may further comprise a width adjuster for selectively moving the distal tips of the distal segments relative to each other to thereby selectively adjust the width of the cutting loop. The width adjuster varies the distance between the distal tips by rotating at least one of the guide lumens.[0016]
• According to another preferred embodiment, a tissue severing device generally comprises a guide, a cutting tool contained within the guide and capable of forming a cutting loop having a loop extension axis defined by the direction in which the cutting loop extends, an extension means for controlling the degree to which the cutting loop extends from the guide, and a distal segment positioning means for varying the direction of each distal segment with respect to the guide axis to thereby adjust the angle between the loop extension axis and the guide axis and selectively position the cutting loop with respect to the guide axis. The guide comprises two co-linear, co-extensive guide lumens longitudinally extending from a proximal region to a distal terminus along a guide axis and the guide lumens have co-extensive distal segments terminating in distal tips from which the cutting loop extends and deformable regions immediately proximal to the distal segments. The defoimable regions facilitate in changing the direction of the distal segments with respect to the guide axis.[0017]
• The distal segment positioning means may comprise retraction cables, each attached to one of the distal segments such that selective tightening and relaxing of the retraction cables adjusts the direction of the distal segments with respect to the guide axis. In addition, selective tightening and relaxing of the retraction cables may further position the cutting loop when extended so as to adjust the angle between the loop extension axis and the guide axis to thereby reposition the cutting loop with respect to the guide axis. The retraction cables may be at least partially and movably disposed within said guide lumens. In an alternative, the deformable regions may comprise a shape-memory material.[0018]
• The distal tips may be at a generally fixed distance therebetween such that the width of the cutting loop when the cutting loop is extended is generally fixed. Alternatively, the device may further comprise a width adjuster to facilitate in selectively moving the distal tips of the distal segments relative to each other to thereby selectively adjust the width of the cutting loop. The width adjuster moves the distal tips of the distal segments and varies the distance between the distal tips by rotating at least one of the guide lumens.[0019]
• According to yet another preferred embodiment, a tissue severing device generally comprises a guide comprising a guide lumen, a cutting tool having a fixed end and is at least partially contained within the guide lumen when in a stored configuration and extendible from a distal tip thereof, an extension means for controlling the degree to which the cutting loop extends from the guide lumen, and a width adjuster for selectively adjusting the width of the cutting loop. The guide lumen longitudinally extends from a proximal region to a distal terminus along a guide axis and has a distal segment terminating in the distal tip. Extension of the cutting tool from the guide lumen forms a cutting loop having a loop extension axis defined by the direction in which the cutting loop extends.[0020]
• According to a preferred embodiment, a method for excising a lobe from within a human patient's breast generally comprises locating the lobe to be excised within the breast and excising at least a part of the lobe utilizing a tissue severing device. The method may further comprise locating a lesion within a lobe of the breast, evaluating the size of the lesion, identifying any extensions of the lesion and any additional lesions within the lobe, and determining from the locating, evaluating, and identifying whether to excise at least a part of the lobe, the entire lobe or the entire lobe plus additional surrounding tissue in the excising in order to remove the lesion or lesions from the breast.[0021]
• The identifying step may generally comprise identifying any extensions of the lesion within the duct system and evaluating the lobe of the breast for additional lesions. Moreover, at least one of the locating, evaluating, identifying, and employing may be carried out using a radiological imaging modality such as ultrasound imaging or magnetic resonance imaging (MRI).[0022]
• According to another preferred embodiment, a method for removing a lesion from a patient generally comprises locating the lesion to be severed and removed from within a selected region of the patient, inserting a guide through an incision, advancing the guide into the selected region, extending a cutting tool contained within the guide from the distal tips of the two guide lumens to form a cutting loop having a loop extension axis defined by the direction in which the cutting loop extends, and moving the cutting loop using the guide along the guide axis to sever tissue containing the lesion from the selected region.[0023]
• The guide advanced by the method generally comprises two co-linear, co-extensive guide lumens longitudinally extending from a proximal region to a distal terminus along a guide axis and having co-extensive distal segments terminating in distal tips. In one embodiment, the angle of each distal segment relative to the guide axis is generally fixed.[0024]
• Alternatively, the guide lumens of the guide advanced by the method have deformable regions immediately proximal to the distal segments that facilitate in changing the direction of each distal segment with respect to the guide axis. The method may further comprise varying the direction of at least one of the distal segments with respect to the guide axis, thereby changing the angle between the loop extension axis and the guide axis, whereby the cutting loop is repositioned with respect to the guide axis. The distal segments of the guide lumens may optionally maintain a generally fixed distance therebetween. Alternatively, the method may further comprise, prior to or during the extending, varying the distance between the distal segments to selectively widen or narrow the cutting loop.[0025]
• According to yet another preferred embodiment, the guide advanced by the method comprises a guide lumen longitudinally extending from a proximal region to a distal terminus along a guide axis, the guide lumen has a distal segment terminating in a distal tip and the cutting tool has a fixed end at least partially contained within the guide lumen when in a stored configuration and is extendable from the distal tip thereof to form a cutting loop.[0026]
• These and other features and advantages of the present invention will be presented in more detail in the following detailed description and the accompanying figures which illustrate by way of example the principles of the invention.[0027]
BRIEF DESCRIPTION OF THE DRAWINGS
• The present invention will be readily understood by the following detailed description in conjunction with the accompanying drawings, wherein like reference numerals designate like structural elements, and in which:[0028]
• FIGS. 1A-1E, collectively referred to as FIG. 1, illustrate a version of the device that employs a cutting tool contained in a guide having two guide lumens in which the guide is housed in a tubular shaft and is adapted to extend out of and retract into the distal end of the tubular shaft;[0029]
• FIGS. 2A-2E, collectively referred to as FIG. 2, illustrate another version of the device that employs a cutting tool contained in a guide having two guide lumens in which the guide is housed in a tubular shaft, a primary window is located near the distal end of the tubular shaft, and the distal tips of the two guide lumens are aligned with the primary window;[0030]
• FIG. 3 illustrates another embodiment of the tissue severing device in which the guide comprises a single guide lumen and the cutting tool is housed within a tubular shaft, has a fixed end, is at least partially contained within the guide lumen, and is extendible through a primary window near the distal end of the tubular shaft;[0031]
• FIGS. 4A-4D, collectively referred to as FIG. 4, illustrate a mechanism for varying the width of a cutting loop by rotating the guide lumens around a guide axis and with respect to each other;[0032]
• FIG. 5 illustrates another embodiment similar to that shown in FIG. 2, in which the tubular shaft comprises an additional window which contains a tissue capturing mechanism;[0033]
• FIG. 6 illustrates another embodiment similar to that shown in FIG. 2, in which a tissue capturing mechanism is contained within the same primary window as the distal tips of the guide lumens;[0034]
• FIGS. 7A-7E, collectively referred to as FIG. 7, illustrate the operation of an embodiment similar to that shown in FIG. 6;[0035]
• FIGS. 8A-8E, collectively referred to as FIG. 8, illustrate embodiments of a tissue marker;[0036]
• FIG. 9 illustrates a handle that may be employed with the tissue severing device described herein;[0037]
• FIG. 10 is a flow chart illustrating a method to severe and remove a mass of tissue or lesion from a patient;[0038]
• FIGS. 11A-11F, collectively referred to as FIG. 11, illustrate a method in which the device of FIG. 1 is used to remove a lesion from a human breast;[0039]
• FIG. 12 is a flowchart illustrating a method for removing a lesion performed in relation to the internal anatomy of the breast; and[0040]
• FIGS. 13A-13E, collectively referred to as FIG. 13, illustrate a method in which the device of FIG. 1 is used to perform a breast lobectomy.[0041]
DESCRIPTION OF SPECIFIC EMBODIMENTS
• The present invention relates to devices and methods that enhance the accuracy of lesion excision, through severing, capturing and removal of a lesion within soft tissue. Furthermore, the present invention relates to devices and methods for the excision of breast tissue based on the internal anatomy of the breast gland. The following description is presented to enable any person skilled in the art to make and use the invention. Descriptions of specific embodiments and applications are provided only as examples and various modifications will be readily apparent to those skilled in the art. The general principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of the invention. Thus, the present invention is to be accorded the widest scope encompassing numerous alternatives, modifications and equivalents consistent with the principles and features disclosed herein. For purpose of clarity, details relating to technical material that is known in the technical fields related to the invention have not been described in detail so as not to unnecessarily obscure the present invention.[0042]
• The present invention relates to tissue severing and removal devices as well as methods for severing and removing tissue. While the invention is generally useful for procedures in soft tissue, the devices are particularly effective in providing precise control during the excision of a lesion or abnormality in breast tissue with minimal invasiveness. In particular a method for severing and removal of part of a lobe, an entire lobe or an entire lobe plus surrounding tissue within a breast is described.[0043]
• FIG. 1 illustrates the distal region of an embodiment of a[0044]tissue severing device100. As is the case with all figures herein, FIG. 1 is not to scale and certain dimensions may be exaggerated for clarity of presentation. As shown, thedevice100 includes aguide102 comprising two co-linear,co-extensive guide lumens104,106. Theguide lumens104,106 extend longitudinally from a proximal region (not shown) to adistal end152 along aguide axis107, an imaginary line that lies along the longest dimension of theguide102. Theguide lumens104,106 have co-extensivedistal segments108,110 terminating indistal tips112,114. Eachdistal segment108,110 has adeformable region116,118 located in a proximal region of the correspondingdistal segment108,110, respectively. Thedeformable regions116,118 enable eachdistal segment108,110 to change direction with respect to theguide axis107. As shown, eachdistal segment108,110 and the correspondingdeformable regions116,118, respectively, are preferably formed as a single piece. That is, the entirety of eachdistal segment108,110 is formed from a deformable material. Alternatively, eachdistal segment108,110 may be formed from integrating or joining separate components comprising one or more materials.
• As shown in FIG. 1, the[0045]guide102 containingguide lumens104,106 is housed in atubular shaft150. Located at adistal end152 of thetubular shaft150 are twoopenings154,156 that allow theguide lumens104,106, respectively, to extend from and retract into thetubular shaft150. Any suitable mechanism (not shown) may be provided for controlling the degree to which theguide lumens104,106 are extended from or retracted into thetubular shaft150. In FIG. 1A, theguide lumens104,106 are in a retracted position such that a substantial portion of thedistal segments108,110 are contained within thetubular shaft150. This arrangement of theguide102 and thetubular shaft150 allows an exposedcutting tool120 to aid in tissue penetration. FIG. 1B illustrates the extension of theguide lumens104,106 indirection109 until at least thedeformable regions116,118 are external to thetubular shaft150.
• The[0046]tubular shaft150 and theguide102 are typically sufficiently rigid such that the act of penetrating thedevice100 into tissue will not cause bending or deflection of either thetubular shaft150 or theguide102. Generally either or both thetubular shaft150 and theguide102 may be constructed from a metallic material such as stainless steel. However, ceramic materials such as alumina and silica or rigid plastic materials such as polystyrene and polyester and/or any other suitable material may also be employed. In addition, the interior and/or exterior surfaces of thetubular shaft150 and theguide102 may be coated with a low friction material such as Teflon®, polyvinylidene fluoride, polyethylene, or another polymeric material to facilitate penetration of tissue by thetubular shaft150 and theguide102, facilitate movement of theguide lumens104,106 with respect to thetubular shaft150, and/or facilitate movement of thecutting tool120 within theguide lumens104,106.
• Further, the[0047]tubular shaft150 may include one or more accessory lumens. Such accessory lumens typically extend fromlumen openings158 located at or near thedistal end152 of thetubular shaft150, as illustrated in FIGS. 1 and 4. An accessory lumen may comprise a transport lumen that allows a material to be transported therethrough to thedistal end152. Gas, liquid, or a combination thereof from an external source may be administered through the transport lumen to thedistal end152. For example, an aqueous solution may be employed for irrigation purposes or a local anesthetic, such as lidocaine, may be administered through the transport lumen. In addition, one or more of the accessory lumens may be operatively connected to an external vacuum source. The external vacuum source may provide suction to remove from the patient, fluids such as blood, irrigation fluid or smoke generated during use of thecutting tool120. It should be noted that for versions of thedevice100 that do not include thetubular shaft150, theguide102 may be constructed to conform to the preferred characteristics of thetubular shaft150.
• Another embodiment of the[0048]guide102 housed in thetubular shaft150 is illustrated in FIG. 2. Thedistal end152 of thetubular shaft150 contains atissue penetrant162 that facilitates advancement of thedevice100 into tissue. Thetissue penetrant162 may be configured to a sharp point (as shown in FIG. 2), a trocar, a scalpel-like blade, or any other suitable mechanism. Additionally or alternatively, thetissue penetrant162 may be operatively connected to an external energy source (not shown). While the external energy source may employ thermal, ultrasonic, or any other suitable energy, the energy source is preferably a radio frequency energy source. Using a radio frequency energy source, thetissue penetrant162 may function as a component of a monopolar or a bipolar system.
• A[0049]primary window160 is located near thedistal end152 of thetubular shaft150. Thedistal tips112,114 are aligned with theprimary window160. The direction of thedistal segments108,110 with respect to theguide axis107 may be predetermined or may be varied as illustrated in FIG. 1. As shown in FIG. 2D, awindow cover166 may be used to cover and uncover theprimary window160. During tissue penetration, it is advantageous to prevent tissue from becoming entrapped in theprimary window160 as this may interfere with the function of theguide102 or of thecutting tool120. Thewindow cover166 may initially cover theprimary window160 to create a smooth, tapered shape to thetubular shaft150 during tissue penetration. Prior to extension of thecutting tool120 to create a cutting loop (not shown), a window controller (not shown) may be used to slide thewindow cover166 in theproximal direction168 to expose theprimary window160 and thecutting tool120 to the tissue. Similarly, thewindow cover166 may slide back to its original position to cover theprimary window160.
• In FIG. 1B, when the[0050]guide102 is extended out of thedistal end152 of thetubular shaft150, thedistal segments108,110 can move with respect to theguide axis107. As shown in FIG. 1C,retraction cables124,126 are employed to change the direction of thedistal segments108,110 with respect to theguide axis107 such that, for example, thedistal segments108,110 are generally in an orthogonal orientation with respect to theguide axis107. Thus, tightening or relaxing theretraction cables124,126 serves to position the cuttingloop122 so as to vary the angle0 between aloop extension axis123 and theguide axis107, resulting in repositioning of thecutting loop122 with respect to theguide axis107. Alternatively, theretraction cables124,126 may be housed within the wall of theguide lumens104,106 or any other suitable control mechanism for controlling the orientation of thedistal segments108,110 may be employed. Alternatively or additionally, thedeformable regions116,118 may be made of a shape-memory metal or metal alloy such as a nickel-titanium alloy. With thedeformable regions116,118 made of a shape-memory material, thedeformable regions116,118 deform to positiondistal segments108,110 at a predetermined direction with respect to theguide axis107 when theguide102 is extended out of thedistal end152 of thetubular shaft150. Thus, the cuttingloop122 can be positioned without the provision or use of retraction cables.
• In any of the embodiments disclosed herein, the angle θ between the[0051]guide axis107 and theloop extension axis123 when thecutting loop122 is extended may alternatively be generally fixed at a predetermined angle rather than adjustable. For example, theretraction cables124,126 may be replaced by elastic cables (not shown) that are not selectively retractable. Before thedistal segments108,110 are extended out of thedistal end152 of thetubular shaft150, the elastic cables are stretched and extended to allow thedistal segments108,110 to generally extend along theguide axis107. When thedistal segments108,110 are extended out of thedistal end152 of thetubular shaft150, the elastic cables contract to a predetermined length to position thedistal segments108,110 such that the angle θ between theguide axis107 and theloop extension axis123 when thecutting loop122 is extended is generally fixed at a predetermined angle. As another example, when thedeformable regions116,118 are made of a shape-memory material, the direction of thedistal segments108,110 when extended out of thedistal end152 of thetubular shaft150, is generally fixed.
• It is noted that the angles between each[0052]distal segment108,110 and theguide axis107 may be either the same or different. For example, in the case where thedevice100 comprisesretraction cables124,126, theretraction cables124,126 may be retracted by a same or different amount so that thedistal segments108,110 are in the same or different orientation relative to theguide axis107.
• FIG. 4 illustrates a cutting loop adjuster for adjusting the width of the[0053]cutting loop122. In FIG. 4A, thedistal segments108,110 are in an orthogonal orientation with respect to theguide axis107. FIGS. 4B, 4C and4D demonstrate that by rotating one or both of theguide lumens104,106 around theguide axis107 such that thedistal tips112,114 move away from each other, the cuttingloop width128 progressively increases in size until a maximalcutting loop width128 is achieved when thedistal tips112,114 are facing opposite directions or an angle α is 180°.
• It is noted that although a[0054]cutting loop122 with an adjustable width may be provided, a generally fixedcutting loop width128 may alternatively be provided in any of the embodiments disclosed herein. For example, thedistal tips112,114 may be at a generally fixed distance relative to each other such that thecutting loop width128 is generally fixed. A generally fixedcutting loop width128 may be provided where, for example, theguide lumens104,106 are generally not rotatable about theguide axis107 such that thedistal tips112,114 remain in a fixed distance relative to each other. It is further noted that where thecutting loop width128 is generally fixed, the cuttingloop122 may nonetheless be extended and/or retracted as appropriate to a desired extension or loop size.
• FIG. 3 illustrates another embodiment in which a tissue severing device is similar to that described above except the[0055]guide102 comprises theguide lumen104 that longitudinally extends along theguide axis107 from a proximal region (not shown) to adistal segment108. Thedistal segment108 terminates in thedistal tip112. Thedistal segment108 includes thedeformable region116. Thedeformable region116 may change the direction of thedistal segment108 with respect to theguide axis107 and thus define an angle θ between thedistal tip112 and theguide axis107. As shown in FIG. 3, theguide102 is housed in thetubular shaft150 similar to that shown in FIG. 2, where thetubular shaft150 has thewindow160 near thedistal end152 such that thedistal tip112 of theguide102 is aligned with thewindow160.
• As illustrated in FIG. 3, the[0056]cutting tool120 is partially contained in theguide lumen104. Thecutting tool120 has a fixedend125 that may be attached to an external portion of theguide102, or in an alternative, as depicted in FIG. 3, thefixed end125 may be attached to thetubular shaft150. In either case, thecutting tool120 is capable of forming thecutting loop122 extending from thedistal tip112 of theguide lumen104. Any suitable extension mechanism (not shown) may provide control over the degree to which thecutting loop122 extends from theguide lumen104. Alternatively or additionally, where thefixed end125 is attached to thetubular shaft150, the cuttingloop width128 can be varied by rotating theguide102 within thetubular shaft150 so as to vary the distance between thedistal tip112 and thefixed end125. In one embodiment, the distance between thedistal tip112 and thefixed end125 is generally fixed such that thecutting loop width128 is generally fixed. It is noted that although thecutting loop width128 is generally fixed, the cuttingloop122 may nonetheless be extended and/or retracted as appropriate to a desired extension or size.
• The direction of the[0057]distal segment108 with respect to theguide axis107 may be varied and/or adjusted by tightening or relaxing a retraction cable (not shown) similar to that described with reference to FIG. 1. Alternatively, the direction of thedistal segment108 with respect to theguide axis107 may be predetermined and fixed.
• Each of FIGS. 1 and 2 illustrates a preferred arrangement in which at least a portion of the[0058]cutting tool120 is disposed in each of theguide lumens104,106. Thecutting tool120 is capable of forming thecutting loop122 by extending thecutting tool120 from one or both of thedistal tips112,114, as shown in FIG. 1D. This extension may be accomplished using any suitable extension mechanism that provides control over the degree to which thecutting loop122 extends from theguide102. Typically, such extension mechanism may incorporate a dial on ahandle190 as illustrated in FIG. 9 or a knob (not shown) that can be pushed or pulled along the handle in the direction of theguide axis107, to extend and retract thecutting tool120, respectively, or any other mechanism known to those skilled in the art.
• The[0059]cutting tool120 may be configured in one of any number of forms to facilitate the cutting or severing of soft tissue such as breast tissue. For example, thecutting tool120 may be a wire or a thin ribbon. The cross-sectional shape of thecutting tool120 may be round, rectangular, square, triangular or any other shape that facilitates the cutting of soft tissue. One or both edges of thecutting tool120 may be sharpened, serrated or both. Thecutting tool120 may comprise a metallic material such as a metal, a metal alloy, a metal laminate, or a metal composite. The metallic material may be, for example, nickel, titanium, iron, cobalt, chromium, copper, tantalum, tungsten, and alloys thereof. Preferred metallic materials include titanium, a titanium alloy such as a nickel-titanium alloy, and alloys such as those typically used in stainless steel.
• The[0060]cutting tool120 may be operatively connected to an external energy source195 (as shown in FIG. 9). The external energy source may be a radio frequency energy source and thecutting tool120 comprises an electrically conductive material. Thecutting tool120 may operate as a monopolar electrode. Thecutting tool120 may also operate as a bipolar electrode with both electrodes located on thecutting tool120, itself, or with the return electrode located elsewhere on thedevice100. Thecutting tool120 may be designed to cauterize as well as cut tissue to control excessive bleeding. When electrical current is transmitted through thecutting tool120, it is preferred that theguide lumens104,106 comprise an electrically insulating material or are coated with such a material to electrically isolate thecutting tool120 within thedevice100.
• Additionally or alternatively, the[0061]cutting tool120 may employ mechanical action to cut or sever tissue. For example, a vibrator may be included for inducing mechanical vibration of thecutting tool120. As another example, thecutting tool120 may employ an ultrasonic energy source to cut tissue. Other variations relating to cutting tool design and implementation are known to those skilled in the art.
• The[0062]device100 may further include a tissue collector for collecting and removing tissue severed by thecutting tool120. As thedevice100 may be employed to sever tissue containing a malignant tumor, the tissue collector is preferably designed to reduce the potential spread of cancerous cells. For example, the tissue collector may comprise a collection bag with an adjustable opening that provides communication to its interior. The collection bag preferably comprises an impermeable material to retain fluid and loose tissue or cells. This reduces the potential for spreading dislodged cancerous cells during removal of the collection bag from the patient. The collection bag is preferably thin-walled and supple. A number of plastic or polymeric materials may be used to construct the collection bag. These materials include, but are not limited to, polyethylene, polypropylene, polybutylene, polyamide, polyimide, polyester, polyvinyl chloride, polyvinyl fluoride, polyvinylidene fluoride, polycarbonate, and polytetrafluoroethylene.
• The collection bag (not shown) may be attached to the[0063]cutting tool120. Thus, the collection bag may open or close by increasing or decreasing the size of thecutting loop122, respectively. As tissue is severed by the cuttingloop122, the severed tissue enters the collection bag as the collection bag follows the path of thecutting loop122. In such a configuration, the collection bag is typically insulated from thecutting tool120.
• Alternatively, the collection bag may be independently deployable with respect to the[0064]cutting loop122. As illustrated in FIGS. 1E and 6, acollection bag174 may be attached to acollection loop172 that is controlled similar to the manner in which thecutting loop122 is controlled. Thecollection loop172 extends from collectiondistal tips176,178 of twocollection lumens180,182. Thecollection loop172 is generally orthogonal to theguide axis107. Thecollection lumens180,182 are similar in design to theguide lumens104,106. As a result, thecollection loop172 may be extended, widened, narrowed, or repositioned with respect to theguide axis107. In some instances the cutting loop adjuster may also be used to adjust thecollection loop172. Alternatively, a collection loop adjuster may be employed to control thecollection loop172 independently of thecutting loop122. As thecollection loop172 extends from the collectiondistal tips176,178, thecollection bag174 opens allowing severed tissue to enter and as thecollection loop172 retracts, thecollection bag174 closes trapping the severed tissue within.
• One or more points along the opening of the[0065]collection bag174, e.g., adjacent the collectiondistal tips176,178, may be fixedly attached to (or adjacent to) the collection distal tip(s)176,178 of the collection lumen(s)180,182 and/or predetermined location(s) on thecollection loop172. The remainder portion along the opening of thecollection bag174 is preferably movably or slidably attached to thecollection loop172. Thus, when thecollection bag174 is in a retracted or stored configuration, thecollection bag174 may be tucked within or along the outside of one or both of thecollection lumens180,182 and/or thetubular shaft150 until thecollection bag174 is deployed.
• In FIG. 1E, the[0066]collection loop172 is aligned with the cuttingloop122. Thecollection lumens180,182 extend from thedistal end152 alongdirection109 similar to theguide lumens104,106. In the embodiment of thedevice100 illustrated in FIG. 6, the collectiondistal tips176,178 are aligned with theprimary window160. Thecollection bag174 is contained within thetubular shaft150 or is contained on the external surface of thetubular shaft150. FIGS. 6B and 6C illustrate thecollection loop172 extended from the collectiondistal tips176,178 with thecollection bag174 partially deployed as in FIG. 6B and fully deployed as in FIG. 6C. Alternatively, as shown in FIG. 5, the collectiondistal tips176,178 may be aligned with anadditional window164 near thedistal end152 of thetubular shaft150.
• FIG. 7 illustrates the[0067]device100 in use after thecutting tool120 has been extended to create thecutting loop122 and thecollection loop172 has been extended to deploy thecollection bag174. As thetubular shaft150 moves in adirection175, along theguide axis107, the cuttingloop122 severs the tissue around alesion200. The severed tissue enters thecollection bag174 as thecollection bag174 closely follows in the path created by the cuttingloop122. As a result, a mass of tissue containing thelesion200 is severed and contained in thecollection bag174. Retraction of thecollection loop172 closes thecollection bag174, thereby capturing thelesion200 within the mass of tissue.
• The[0068]device100 allows tissue to be severed and collected along a straight path. If the severed tissue does not rotate or change orientation with respect to theguide axis107 as it is removed from the patient, the surgeon or operator can carefully remove the severed tissue from thecollection bag174 without disturbing the orientation of the severed tissue. The surgeon or operator may then mark the specimen with various dyes commonly used for said purpose or with sutures or clips.
• According to a preferred embodiment shown in FIG. 8, the tissue severing device may further comprise a tissue marker for marking in vivo the mass of tissue severed, i.e., before it is removed from the patient. In one embodiment, a tissue marker, illustrated in FIG. 8A, comprises a series of marking[0069]segments302,304 and306 attached to and/or extending from the cuttingloop122. The markingsegments302,304 and306 may comprise a series of thin strands of electrically conductive wires that trail behind thecutting loop122 as tissue is severed. The markingsegments302,304 and306 may be in electrical communication with the cuttingloop122. If a radio frequency energy source is used to energize thecutting loop122, the markingsegments302,304 and306 may be similarly energized. By contacting the cut surface of the severed tissue, the markingsegments302,304 and306 may cause a blackening or charring of the cut surface, thereby producing different marks on the different sides of the severed tissue. The markingsegments302,304 and306 may be arranged in any fashion to orient the severed tissue, one example being illustrated in FIG. 8A. The markingsegments302,304 and306 and thecutting tool120 may be formed as a single component or as an alternative, the markingsegments302,304 and306 may be attached to thecutting tool120. The markingsegments302,304 and306 may comprise a metal, a metal alloy, a metal laminate, or a metal composite. The markingsegments302,304 and306 may comprise a braided metal, a braided metal alloy, a braided metal laminate or a braided metal composite.
• As yet a further alternative, the marking segments may be constructed into any pattern or[0070]patterns308,310 and312 as illustrated in FIG. 8B. The marking segments in any of the above alternative embodiments are preferably designed not to contact or interfere with the tissue collector such as the collection bag174 (shown in FIG. 8D).
• FIG. 8C illustrates another embodiment of a tissue marker in which[0071]tissue marking extensions322,324, and326 are asymmetrically arranged on a trailingedge320 of thecutting loop122. If an external radio frequency energy source is used to energize thecutting loop122, a cutting current or sinusoidal waveform can be used to sever tissue at aleading edge328 of thecutting loop122. When electrical current passes through the extensions, e.g., as a result of the electrical communication between theextensions322,324 and326 and thecutting loop122, the enlarged surface areas ofextensions322,324 and326 would create a cautery effect resulting in charring or blackening of the surface of the severed tissue in contact with theextensions322,324 and326. Theextensions322,324 and326 can be arranged in any pattern or number along the cuttingloop122 to asymmetrically blacken or char the surface of the severed tissue. Theextensions322,324 and326 and thecutting loop122 may be formed as a single piece, or may be formed separately and later attached to each other. Theextensions322,324 and326 may comprise a metallic material such as a metal, a metal alloy, a metal laminate, or a metal composite.
• FIG. 8D illustrates yet a further embodiment of the tissue marker in which the[0072]collection bag174 is attached to thecollection loop172. Dyes ofdifferent colors330,332 and334 are present on individual regions on aninterior surface336 of thecollection bag174. For example, dye330 may be red,dye332 may be blue anddye334 may be yellow. Although not preferred, the dyes may additionally or alternatively be attached to and extending from the collection loop172 (not shown). As the severed tissue enters thecollection bag174, the differentcolored dyes330,332 and334 may contact and mark the severed tissue at different locations.
• Alternatively, as shown in FIG. 8E, one or more dye colors may be used in[0073]different patterns340,342 and344 on theinterior surface336 of thecollection bag174. As yet another alternative (not shown), any combination of colored dye(s), size(s), and/or pattern(s) may be used to coat theinterior surface336 of thecollection bag174. As a further alternative (not shown), the tissue marker may be coated or otherwise disposed inside of acollection bag opening350 to thereby mark the severed tissue as it passes through thecollection bag opening350. As yet a further alternative (also not shown), the tissue marker may coat the trailing edge of thecutting tool120, thereby marking the tissue just as it is severed by the leading edge of thecutting tool120. The dyes may be any suitable dye such as methylene blue, lymphazurine blue and congo red that are commonly used in clinical medicine.
• FIG. 9 illustrates an[0074]exemplary handle190 that may be provided to facilitate ease of manipulation of any tissue severing device described herein. Thehandle190 is typically provided at the proximal region of the guide or the tubular shaft (not shown) of the tissue severing device. As shown, thehandle190 includescontrols191,192,193,194 that provide control of, for example, a loop extender, a width adjuster, a distal segment positioning mechanism, and a tissue collector controller, respectively. Thehandle190 may also contain a knob or dial to control the extension and retraction of the guide as well as a knob or dial to control the window cover (not shown). As an example, the operator may push a knob that is in continuity with theguide102 in a proximal direction to extend the guide from the distal end of the tubular shaft and pull the knob in a distal direction to retract the guide. Thehandle190 may also provide an interface to theexternal energy source195, anexternal vacuum source196, and/or an external fluid orgas source197.
• The various exemplary embodiments of the tissue severing device facilitates in severing and removing a mass of tissue such as a lesion from a selected region of a patient's breast. The use of the tissue severing device is preferably performed in relation to the internal anatomy of the breast and more specifically to excise part of a lobe, an entire lobe, or an entire lobe with adjacent tissue. It is to be understood that the tissue severing device may also be used, for example, on any other soft tissue regions, including but not limited to, liver and prostate, and may be used on other areas of a human or on non-human animals.[0075]
• FIG. 10 illustrates a[0076]method400 to severe and remove a mass of tissue or lesion from a patient. Atstep402, the lesion to be severed and removed from within a selected region of the patient is located. Atstep404, a tubular shaft containing a guide is inserted through an incision and into the selected region.
• In one embodiment, the guide is similar to the guide described above with reference to FIG. 1 in which the guide includes two co-linear, co-extensive guide lumens longitudinally extending from a proximal region to a distal terminus along a guide axis, the guide lumens having co-extensive distal segments terminating in distal tips. The guide also includes a cutting tool contained therein and capable of forming a cutting loop extending from the distal tips of the two guide lumens, the cutting loop forming a loop extension axis defined by the direction in which the cutting loop extends. The guide preferably also includes an cutting loop extension control for controlling the degree to which the cutting loop extends from the guide.[0077]
• In one embodiment, the angle of each distal segment of the guide lumens in relation to the guide axis is generally fixed. Alternatively, the guide lumens have deformable regions immediately proximal to the distal segments that facilitate in changing the direction of the distal segments with respect to the guide axis. In this configuration, the guide includes a distal segment positioning means for varying the direction of each distal segment with respect to the guide axis to thereby adjust the angle between the loop extension axis and the guide axis and selectively position the cutting loop with respect to the guide axis.[0078]
• In yet another alternative embodiment, a guide comprises a single guide lumen that has a distal segment terminating in a distal tip. The guide also includes a cutting tool that has a fixed end and is at least partially contained within the guide lumen when in a stored configuration and extendible from the distal tip thereof. Extension of the cutting tool from the guide lumen forms a cutting loop having a loop extension axis defined by the direction in which the cutting loop extends. The single lumen guide preferably also includes an cutting loop extension control for controlling the degree to which the cutting loop extends from the guide and a width adjuster for selectively adjust the width of the cutting loop.[0079]
• At[0080]step406, the tubular shaft and guide are advanced into the selected region. Next, the position of the distal end of the tubular shaft is evaluated in relation to the lesion atstep408. Atstep410, the tubular shaft is repositioned by advancing and/or retracting the tubular shaft and/or by changing the angle of insertion to enable extension of the distal tips of the guide lumens to a predetermined location with respect to the lesion. At step412, the guide lumens are extended from the distal end of the tubular shaft to position the distal tips to the predetermined location with respect to the lesion.
• At[0081]step414, a cutting tool contained within the guide is extended from the distal tips of the two guide lumens to form a cutting loop. A loop extension axis is defined by the direction in which the cutting loop extends. Atstep416, the guide is moved in order to move the cutting loop along the guide axis severing tissue around the lesion. Atstep418, the cutting loop is retracted. Lastly, atstep420, the device and the severed mass of tissue are removed from the selected region through the incision.
• The method to sever and remove a mass of tissue may optionally include a number of additional steps. For example, a radiological imaging modality may be used to locate the lesion and visualize all or part of the procedure, including insertion of the device, severing of tissue and/or removal of the severed tissue. Any suitable imaging modality may be used, including but not limited to mammography, including digital and stereotactic mammography, MRI, including three dimensional MRI, and ultrasound, including three-dimensional ultrasound, radial or axial ductal ultrasound. Preferably, ultrasound or three-dimensional ultrasound is used as such imaging modalities render real-time or near real-time images.[0082]
• According to a preferred embodiment, the cutting tool may be operatively connected to an external energy source. The cutting tool may be energized before and/or during advancement of the guide and the tubular shaft into the selected region such as in[0083]step406 to aid in tissue penetration. The cutting tool may also be energized before and/or during its extension to create a cutting loop instep414, duringstep416 and/or duringstep418.
• The degree to which the cutting loop extends from the guide lumens, the width of the cutting loop, and/or the angle between the loop extension axis and the guide axis may optionally be varied according to the evaluation of the lesion size and the position of the distal tips of the guide lumens in relation to the lesion, after step[0084]412 and prior to step414.
• The method to sever and remove a mass of tissue described above has the advantage of positioning a portion of the device with a larger diameter or cross-sectional area near the desired location and then extending and advancing a portion of the device with a smaller diameter or cross-sectional area for more precise and accurate positioning of the cutting tool and optionally the collection bag.[0085]
• In one embodiment, the severed tissue or specimen may be marked in vivo to aid in specimen orientation once the specimen is removed from the body. Such marking may occur while the tissue is being severed and/or after the tissue is severed. The severed tissue may be collected while the tissue is being severed and/or after the tissue is severed. Tissue collection may be accomplished, for example, by extending a collection bag from the guide or from the tubular shaft.[0086]
• It should be noted that other methods for removing a lesion from a patient may be implemented using different guides, cutting tool arrangements and/or different tubular shafts. In an embodiment utilizing a different tubular shaft, for example, a window may be provided near the distal end of the tubular shaft. The distal tips of the guide lumens are aligned with the window allowing the cutting tool to extend and retract through the window. In this embodiment, after the tubular shaft is inserted through a skin incision, the tissue is penetrated with the tubular shaft until the distal end is proximate to the lesion. To aid in tissue penetration, the distal end of the tubular shaft is preferably configured to a sharp point, trocar or scalpel-like blade. In addition, the distal end may additionally or alternatively be energized by an external energy source. The cutting tool is extended from the distal tips of the guide lumens and through the window to create a cutting loop. The tubular shaft is moved along the direction of the guide axis to allow the cutting loop to sever tissue around the lesion. The cutting tool is retracted and the severed tissue containing the lesion is removed from the patient.[0087]
• In another embodiment, a tubular shaft having a window near the distal end contains a guide. The guide comprises a guide lumen longitudinally extending from a proximal region to a distal terminus along a guide axis. The guide lumen has a distal segment terminating in a distal tip aligned with the window. After the tubular shaft and guide are advanced into the selected region to position the distal tip of the guide proximate to the lesion, a cutting tool having a fixed end and contained at least partially within the guide lumen is extended from the distal tip of the guide and through the window of the tubular shaft to form a cutting loop. The tubular shaft is used to move the cutting loop along the guide axis to sever tissue around the lesion.[0088]
• In yet another embodiment, the guide is not housed in a tubular shaft. The guide comprises two co-linear, co-extensive guide lumens longitudinally extending from a proximal region to a distal terminus along a guide axis and the guide lumens have co-extensive distal segments terminating in distal tips. Once the guide is advanced into the selected region to position the distal terminus of the guide proximate to the lesion, a cutting tool contained within the guide is extended from the distal tips of the two guide lumens to form a cutting loop. The guide is then used to move the cutting loop along the guide axis to sever tissue around the lesion and the severed tissue containing the lesion is removed from the selected region.[0089]
• Although the inventive device may be employed for severing a mass of tissue containing a lesion from any soft tissue site, one preferred use of the device is to excise a lesion from breast tissue. FIG. 11 illustrates the removal a lesion from within a selected region of a patient's breast utilizing one embodiment of the device described above with reference to FIG. 1. FIG. 11A illustrates the insertion of[0090]device100 through anincision202 located at the periareolar region of thebreast204. Once thedistal end152 of thetubular shaft150 is positioned proximate to thelesion200, the distance and angle of the projected extension of thedistal tips112,114 of theguide102 in relation to thelesion200 is evaluated. Depending on this evaluation, thetubular shaft150 may be repositioned by changing its angle of insertion and/or distance with respect to thelesion200.
• As shown in FIG. 11B, once the[0091]tubular shaft150 is positioned at a desired location, theguide102, being of smaller diameter than thetubular shaft150, is advanced fromdistal end152 of thetubular shaft150 to position thedistal tips112,114 of theguide102 to a predetermined position distal to thelesion200. The cuttingloop122 and thetissue collector170 are then deployed as shown in FIG. 11C. In particular, thetissue collector170 comprises atissue collection loop172 and atissue collection bag174.
• As shown in FIG. 11D, by retracting the[0092]guide102 back into thetubular shaft150, the cuttingloop122 severs tissue around thelesion200 while thecollection bag174 collects the severed mass of tissue containing thelesion200. As thecutting loop122 is moved proximal to thelesion200, the cuttingloop122 is retracted followed by retraction of thecollection loop172. As shown in FIG. 11E, retraction of thecollection loop172 closes the opening of thecollection bag174, thereby capturing the severed mass of tissue therein.
• As shown in FIG. 11F, withdrawing the[0093]entire device100 from thebreast204 results in removal of the severed mass of tissue containing thelesion200 from thebreast204. Optionally, a tissue marker as described above may be employed as well.
• FIG. 12 is a flowchart illustrating a[0094]method450 for removing a lesion performed in relation to the internal anatomy of the breast. The method begins atstep452 in which the location of the lesion is determined with respect to the lobe of the breast in which it is contained. Atstep454, the size of the lesion is evaluated. Atstep456, the duct system of the lobe is evaluated for extension of the lesion within the ducts. Atstep458, the lobe is evaluated for possible other lesions. Atstep460, the determination to excise part of the lobe, the entire lobe, or the entire lobe plus adjacent breast tissue in order to remove the entire lesion or lesions from the breast is determined from the determinations made in steps452-458. Finally, atstep462, a tissue severing and removal device is employed to excise part of the lobe, the entire lobe, or the entire lobe along with adjacent breast tissue.
• Unless otherwise specified, the described method involving tissue removal is based on the internal anatomical boundaries of the breast, and more particularly, excision of part of a lobe, an entire lobe or an entire lobe plus adjacent tissue, may be accomplished through surgical tools known in the art or by using the devices as described above.[0095]
• FIG. 13 illustrates the use of the device of FIG. 1 to perform a breast lobectomy. FIG. 13A illustrates the[0096]breast204 of a human female patient. Thelobe206, located within thebreast204, contains amain duct208, although breast lobes may often contain more than one main duct. Anincision202 located at a central area of thebreast204 and preferably at the periareolar region is usually made using an additional cutting implement such as a scalpel. Thedevice100 is inserted through theincision202 and into thebreast204. As illustrated in FIG. 13B, theguide102 is advanced from the interior of thetubular shaft150, adjacent to thelobe206, to position thedistal tips112,114 of theguide lumens104,106 past the peripheral most aspect of thelobe206. In addition, FIG. 13B illustrates the deployment ofretraction cables124,126. As a result, the angle θ between theloop extension axis123 and theguide axis107 has been changed from approximately 180° to approximately 90°. As illustrated in FIG. 4, the twoguide lumens104,106 can be rotated about theguide axis107 to move thedistal tips112,114 away from each other in order to widen thecutting loop122 to allow thecutting loop122 to encompass the width or diameter of thelobe206.
• FIG. 13C illustrates extension of the[0097]cutting tool120 to create thecutting loop122. Thetissue collector170 is deployed either simultaneously with the extension of thecutting tool120 or preferably after thecutting tool120 has been extended and slightly moved along theguide axis107. This keeps thetissue collector170 at a predetermined distance from the cuttingloop122.
• As shown in FIG. 13D, by retracting the[0098]guide102 back into thetubular shaft150, the cuttingloop122 severs thelobe206 from surrounding tissue while thecollection bag174 of thetissue collector170 contains the severedlobe206. It should be noted that thecutting loop122 and thecollection loop172 may be adjusted while the guide is retracting to allow the severing action to follow the contour of thelobe206. As shown in FIG. 13E, once the cuttingloop122 has moved to a predetermined site near the nipple defining the central boundary of thelobe206, the cuttingloop122 is retracted followed by retraction of thecollection loop172. Retraction of thecollection loop172 closes the opening of thecollection bag174, entrapping the severedlobe206 therein. The severedlobe206 may be removed from thebreast204 by withdrawing theentire device100 through theincision202 and out of the breast204 (not shown).
• It is to be understood that various other features may be provided in the tissue severing device. For example, locking mechanisms may be provided to ensure a greater degree of control over the spatial relationship between the cutting tool and the guide. In addition, the device may be manually, automatically, and/or remotely controlled. In addition, while use of the inventive methods and devices has generally been described in terms of surgery on the female human breast, the inventive devices and methods may be used on other soft tissue regions, including but not limited to liver and prostate, may be used on other areas of a human or on non-human animals as well.[0099]
• All patents, patent applications, and publications referenced herein are hereby incorporated by reference in their entireties.[0100]
• While the preferred embodiments of the present invention are described and illustrated herein, it will be appreciated that they are merely illustrative and that modifications can be made to these embodiments without departing from the spirit and scope of the invention. Thus, the invention is intended to be defined only in terms of the following claims.[0101]

Claims (72)

1. A tissue severing device, comprising:

a guide comprising two co-linear, co-extensive guide lumens longitudinally extending from a proximal region to a distal terminus along a guide axis, wherein the guide lumens have co-extensive distal segments terminating in distal tips and the angle of each distal segment in relation to the guide axis is generally fixed;

a cutting tool contained within the guide and capable of forming a cutting loop extending from the distal tips of the two guide lumens, said cutting loop having a loop extension axis defined by the direction in which the cutting loop extends; and

an extension means for controlling the degree to which the cutting loop extends from the guide.

2. The device ofclaim 1, wherein said distal tips are at a generally fixed distance therebetween such that the width of the cutting loop when the cutting loop is extended is generally fixed.

3. The device ofclaim 1, wherein the angles between each distal segment and the guide axis are one of the same and different.

4. The device ofclaim 1, further comprising a width adjuster for selectively moving the distal tips of the distal segments relative to each other to thereby selectively adjust the width of the cutting loop.

5. The device ofclaim 4, wherein said width adjuster moves the distal tips of the distal segments and varies the distance between the distal tips by rotating at least one of the guide lumens.

6. The device ofclaim 4, further comprising a handle at the proximal region of the guide, said handle comprising the extension means and the width adjuster.

7. The device ofclaim 1, wherein the cutting tool comprises an electrically conductive material.

8. The device ofclaim 7, wherein the electrically conductive material is a metallic material selected from the group consisting of a metal, a metal alloy, a metal laminate, and a metal composite.

9. The device ofclaim 8, wherein the metallic material is one of titanium, titanium alloy, nickel-titanium alloy, nickel-chromium, and iron-chromium alloy.

10. The device ofclaim 7, wherein the cutting tool is operatively coupled to an energy source.

11. The device ofclaim 10, wherein the energy source is one of a heat source, a radio frequency energy source, and an ultrasonic energy source.

12. The device ofclaim 10, wherein the energy source is a radio frequency energy source and the cutting tool is a component of a monopolar or a bipolar system.

13. The device ofclaim 1, wherein the cutting tool has a predetermined cross-sectional shape.

14. The device ofclaim 1, wherein the cutting tool has a cutting edge and a trailing edge.

15. The device ofclaim 14, wherein the cutting edge is at least one of sharpened and serrated.

16. The device ofclaim 14, further comprising a vibration-providing means for inducing mechanical vibration of the cutting tool.

17. The device ofclaim 1, wherein the guide lumens comprise an electrically insulating material.

18. The device ofclaim 1, further comprising a tissue collector for collecting and removing tissue severed by the cutting tool.

19. The device ofclaim 18, further comprising a tissue collector controller for controlling said tissue collector.

20. The device ofclaim 18, wherein the tissue collector is adapted to collect tissue at least one of as the tissue is being severed and after the tissue is severed.

21. The device ofclaim 18, wherein the tissue collector comprises a tissue collection bag, said collection bag being one of directly and indirectly attached to the distal terminus of the guide.

22. The device ofclaim 21, further comprising means for opening and closing the tissue collection bag.

23. The device ofclaim 21, wherein said tissue collection bag is attached to said cutting tool whereby increasing and decreasing the size of said cutting loop opens and closes said tissue collection bag, respectively.

24. The device ofclaim 21, wherein said tissue collection bag is electrically insulated from said cutting tool.

25. The device ofclaim 21, wherein said collection bag is deployable and adjustable independent of said cutting tool and wherein said tissue collector further comprises a collection loop adapted to be selectively opened and closed.

26. The device ofclaim 21, wherein said tissue collector further comprises a tissue collection loop adapted to be selectively opened and closed and two tissue collection lumens having collection distal tips from which said collection loop extends, said tissue collection bag being attached to said tissue collection loop.

27. The device ofclaim 26, wherein said collection loop is aligned with said cutting loop.

28. The device ofclaim 21, wherein the collection bag comprises an impermeable material.

29. The device ofclaim 28, wherein the impermeable material is selected from the group consisting of polyethylene, polypropylene, polybutylene, polyamide, polyimide, polyester, polyvinyl chloride, polyvinyl fluoride, polyvinylidene fluoride, polycarbonate, and polytetrafluoroethylene.

30. The device ofclaim 1, further comprising a tissue marker, said tissue marker configured to mark tissue severed by the cutting tool.

31. The device ofclaim 30, wherein the tissue marker is in electrical communication with an external energy source.

32. The device ofclaim 31, wherein the external energy source is a radio frequency energy source.

33. The device ofclaim 32, wherein the tissue marker comprises means for charring or creating blackened marks on the surface of the severed tissue.

34. The device ofclaim 33, wherein the tissue marker comprises marking segments extending from a trailing edge of said cutting loop.

35. The device ofclaim 34, wherein the marking segments comprise a metallic material.

36. The device ofclaim 34, wherein the marking segments are asymmetrically arranged along the trailing edge of the cutting loop.

37. The device ofclaim 34, wherein the marking segments comprise electrically conductive wires.

38. The device ofclaim 37, wherein at least some of the electrically conductive wires are interwoven to create a pattern asymmetrically arranged along the trailing edge of the cutting loop.

39. The device ofclaim 34, wherein the marking segments comprise extensions of the cutting loop asymmetrically arranged thereon.

40. The device ofclaim 30, wherein the tissue marker comprises a dye for staining the severed tissue.

41. The device ofclaim 40, wherein the dye is located on a plurality of regions on the interior surface of one of a collection bag and the cutting loop.

42. The device ofclaim 41, wherein the individual regions of dye are arranged in an asymmetric pattern on the interior surface of one of the collection bag and the cutting loop.

43. The device ofclaim 40, wherein the collection bag comprises an opening, said opening containing the dye in individual regions thereon.

44. The device ofclaim 40, wherein said dye is of at least two different colors.

45. The device ofclaim 1, wherein the guide lumens are affixed to each other.

46. The device ofclaim 1, wherein the guide lumens are housed in a tubular shaft, said tubular shaft having a distal end and a proximal end.

47. The device ofclaim 46, wherein the tubular shaft further includes at least one accessory lumen.

48. The device ofclaim 47, further comprising a tissue collector for collecting and removing tissue severed by the cutting tool, said tissue collector being contained in one of the at least one accessory lumen.

49. The device ofclaim 48, wherein the tubular shaft has at least one opening at the distal end and wherein the tissue collector is adapted to extend from and retract into the tubular shaft through one of the at least one opening at the distal end.

50. The device ofclaim 47, wherein the at least one accessory lumen comprises at least one transport lumen that allows a material to be transported therethrough to the distal end.

51. The device ofclaim 50, further comprising a source of gas, liquid or a combination thereof in fluid communication with the at least one accessory lumen.

52. The device ofclaim 50, wherein the at least one accessory lumen additionally comprises at least one vacuum lumen operatively connected to a vacuum source.

53. The device ofclaim 47, wherein the at least one accessory lumen comprises at least one vacuum lumen operatively connected to a vacuum source.

54. The device ofclaim 46, further comprising a tissue penetration means for facilitating tissue penetration, said tissue penetration means being attached to said distal end of said tubular shaft.

55. The device ofclaim 54, wherein the tissue penetration means comprises at least one of a sharpened edge and a sharpened tip.

56. The device ofclaim 54, wherein the tissue penetration means is operatively coupled to an external energy source.

57. The device ofclaim 56, wherein the external energy source is one of a radio frequency energy source and an ultrasonic energy source.

58. The device ofclaim 57, wherein the external energy source is the radio frequency energy source and the tissue penetration means is a component of a monopolar or a bipolar system.

59. The device ofclaim 46, wherein the tubular shaft has a primary window near the distal end.

60. The device ofclaim 59, wherein the distal tips of the guide lumens are aligned with the primary window and the cutting tool is adapted to extend and retract therethrough.

61. The device ofclaim 60, further comprising a tissue collector adapted to collect and remove severed tissue, said tissue collector being contained in the primary window and extendible therefrom.

62. The device ofclaim 61, wherein said tissue collector comprises a tissue collection loop, a tissue collection bag attached thereto, and two tissue collection lumens having collection distal tips from which said tissue collection loop extends, said tissue collection loop adapted to be selectively opened and closed.

63. The device ofclaim 59, wherein said tubular shaft comprises a sliding cover for selectively uncovering and covering said primary window.

64. The device ofclaim 63, further comprising a cover controller for selectively controlling the position of the sliding cover with respect to the primary window.

65. The device ofclaim 59, wherein the tubular shaft has an additional window near the distal end of the tubular shaft adjacent to the primary window.

66. The device ofclaim 65, further comprising a tissue collector for collecting and removing tissue severed by the cutting tool, said tissue collector being contained in the additional window.

67. The device ofclaim 66, wherein the tissue collector is extendible and retractable through said additional window.

68. The device ofclaim 67, wherein said tubular shaft comprises a sliding cover for selectively uncovering and covering at least one of said primary window and said additional window.

69. The device ofclaim 68, further comprising a cover controller for selectively controlling the position of the cover with respect to at least one of the primary window and the additional window.

70. The device ofclaim 46, wherein the tubular shaft has at least one opening at the distal end and wherein the guide lumens are adapted to extend from and retract into the tubular shaft through at least one of the at least one opening at the distal end.

71. The device ofclaim 70, further comprising an extension-retraction controller adapted to extend and retract the guide lumens with respect the tubular shaft

72-123. (Canceled)

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