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  Post-biopsy cavity treatment implants and methodsUSPTO Application #: 20070299541Title: Post-biopsy cavity treatment implants and methods Abstract: An implant for filling a cavity created by an excisional procedure includes first and second portions. The first portion may include a first collagenous matrix that defines a first selected crosslinking density and the second portion may include a second collagenous matrix that defines a second selected cross-linking density that is different than the first cross-linking density. The first and second cross-linking densities may be selected so as to cause the first and second portions to swell in such a manner that the implant swells into a size and a shape that is similar to the predetermined size and shape of the cavity when the implant is implanted. An aqueous solution may be added to the cavity if the cavity is not sufficiently aqueous to cause the implant to swell. (end of abstract) Agent: Young Law Firm, P.C. Alan W. Young - Portola Valley, CA, US Inventors: Ary S. CHERNOMORSKY, James W. Vetter, Simon Chernomorsky USPTO Applicaton #: 20070299541 - Class: 623023720 (USPTO) Related Patent Categories: Prosthesis (i.e., Artificial Body Members), Parts Thereof, Or Aids And Accessories Therefor, Implantable Prosthesis, Tissue The Patent Description & Claims data below is from USPTO Patent Application 20070299541. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This is a divisional of copending application Ser. No. 10/627,960, filed Jul. 25, 2003, which application is hereby incorporated herein by reference in its entirety. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to post-biopsy cavity treatment methods and implants. More particularly, the present inventions relates to post-biopsy cavity treatment implants inserted into cavities formed in soft tissue that may be created during a biopsy or therapeutic excisional procedure. [0004] 2. Description of the Related Art [0005] Breast biopsies are routinely performed in the United States following a detection of abnormalities discovered through mammographic visualization, manual palpation or ultrasound examination. There are a number of traditional methods to obtain breast biopsy tissue samples, including surgical excisional biopsies and stereotactic and ultrasound guided needle breast biopsies. Recently, methodologies have emerged that are based upon percutaneous minimally invasive large intact tissue sample collection. The use of these devices results in a unique cavity connected to the skin by a narrow neck. However, it is becoming apparent, therefore, that the post-biopsy biopsy cavities left by these procedures may both offer and require different post procedural treatments, as compared to the cavities left by needle, core biopsy procedures or open surgical procedures, due to the different nature, size and shape of the cavity created by conventional biopsy devices, as well as the narrow connection to the skin characterized by percutaneous approaches. [0006] In certain cases, locating a previously biopsied area is highly desirable. Therefore, to mark the biopsy site, a variety of biopsy site markers and identifiers have been developed, ranging from metal clips to pellets and sponges placed during or right after the biopsy procedure. Usually, these markers contain radiopaque and/or echogenic articles and include features such as metal clips and air or gas bubbles incorporated in a biodegradable matrix. From the foregoing, it is apparent that improved methods and devices are needed to treat the cavities left by biopsy devices that are configured to retrieve large intact specimens. SUMMARY OF THE INVENTION [0007] The present invention, according to an embodiment thereof, is a method of filling a cavity created by an excisional procedure, the cavity having a predetermined size and shape. The method may include steps of providing an implant, the implant including at least a first portion and a second portion, the first portion comprising a first collagenous matrix that defines a first selected crosslinking density, the second portion comprising a second collagenous matrix that defines a second selected cross-linking density that is different than the first cross-linking density. The first and second cross-linking densities may be selected so as to cause the first and second portions to swell in such a manner that the implant swells into a size and a shape that is similar to the predetermined size and shape of the cavity when the implant is implanted. The implant may then be implanted within the cavity through an incision. An aqueous solution may be added to the cavity if the cavity is not sufficiently aqueous to cause the implant to swell. The incision may then be closed with the implant implanted in the cavity. [0008] The providing step may be carried out with the first portion comprising a plurality of first collagenous fibers, each of the plurality of first collagenous fibers having the first selected crosslinking density. The providing step may be carried out with the second portion comprising a plurality of second collagenous fibers, each of the plurality of second collagenous fibers having the second selected cross-linking density. [0009] According to another embodiment thereof, the present invention is an implant for filling a cavity created by an excisional procedure, the cavity having a predetermined size and a shape. The implant may include a first portion including a first collagenous matrix that defines a first selected crosslinking density, and a second portion including a second collagenous matrix that defines a second selected cross-linking density that is different than the first cross-linking density. The first and second cross-linking densities may be selected so as to cause the first and second portions to swell in such a manner that the implant assumes a size and a shape that is similar to the predetermined size and shape of the cavity when the implant is implanted. [0010] The first portion may include a plurality of first collagenous fibers, each of the plurality of first collagenous fibers having the first selected crosslinking density. The second portion may include a plurality of second collagenous fibers, each of the plurality of second collagenous fibers having the second selected cross-linking density. BRIEF DESCRIPTION OF THE DRAWINGS [0011] For a further understanding of the objects and advantages of the present invention, reference should be made to the following detailed description, taken in conjunction with the accompanying figures, in which: [0012] FIG. 1 shows an exemplary large intact specimen percutaneous biopsy device in operation. [0013] FIG. 2 shows further aspects of the exemplary large intact specimen percutaneous biopsy device of FIG. 1 in operation. [0014] FIG. 3 shows further aspects of the exemplary large intact specimen percutaneous biopsy device of FIG. 1 in operation. [0015] FIG. 4 shows still further aspects of the exemplary large intact specimen percutaneous biopsy device of FIG. 1 in operation. [0016] FIG. 5 shows further aspects of the exemplary large intact specimen percutaneous biopsy device of FIG. 1 in operation. [0017] FIG. 6A shows further aspects of the exemplary large intact specimen percutaneous biopsy device of FIG. 1 in operation, and illustrates the creation of a cavity within the soft tissue from which the excised specimen was taken. [0018] FIG. 6B is a cross sectional view of the post treatment cavity of FIG. 6A, taken along cross-sectional line II'. [0019] FIG. 7 shows further aspects of the exemplary large intact specimen percutaneous biopsy device of FIG. 1 in operation, and further illustrates the creation of a cavity within the soft tissue from which the specimen was taken, with the aforementioned narrow neck or access path connecting the cavity to the skin. [0020] FIG. 8 shows an exemplary delivery device for a post-biopsy cavity treatment implant, according to an embodiment of the present invention. Continue reading... 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