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Described herein are a tooth bud ablation (TBA) procedure and a tooth bud ablation (TBA) system.
Approximately 3.5% of the total $100 billion spent on dental care in the United States in 2008 was for traditional surgical removal of third molars (i.e. “wisdom teeth” extractions), including the associated costs of imaging, sedation, and resulting complications. Traditional surgical removal of third molars, however, is a highly invasive, painful, and complication-ridden procedure. Further, third molar extraction represents the only procedure in the United States and Europe where it is considered “normal” to subject patients of any age group to such a highly invasive prophylactic surgery that carries significant lifelong risks for the excision of asymptotic or non-pathologic tissue. Dental practitioners (e.g. general dentists, pediatric dentists, and oral surgeons) have been trained to remove children's wisdom teeth (third molars) before the wisdom teeth cause problems, but this surgery carries significant pain, risks, and costs.
The main problem associated with third molar tooth extractions—aside from the pain inflicted—is the serious risk of complications associated with such an invasive procedure. Each year “more than 11 million patient days of ‘standard discomfort or disability’—pain, swelling, bruising, and malaise—result post-operatively, and more than 11,000 people suffer permanent paraesthesia—numbness of the lip, tongue, and cheek—as a consequence of nerve injury during the surgery. At least two thirds of these extractions, associated costs, and injuries are unnecessary, constituting a silent epidemic of iatrogenic injury that afflicts tens of thousands of people with lifelong discomfort and disability.”
If you interview people under the age of 40 and ask them what has been the most invasive surgical procedure they have personally experienced (that is not trauma related), there is a greater than 90% chance that it will be their “wisdom teeth” extraction. The current standard of care in America for “managing” third molars (e.g. “wisdom teeth”) in adolescents and young adults is generally to have all four third molars extracted once they are formed, unless it is absolutely clear that these teeth will erupt normally. General dentists and oral surgeons alike are complicit in their belief that third molars generally should be extracted because not all will erupt normally, thus causing future pathology.
Each year, an estimated 10 million third molar tooth extractions account for over 92% of all teeth extracted for patients under the age of 40. This represents surgery on approximately 5 million people each year at an estimated cost of over $2.5 billion for third molar extraction fees alone in the United States. When IV sedation fees, X-ray imaging expenses, post-op medications, and unplanned post-operative expenses associated with treating complications are added in, the true United States health care cost is estimated to be well over $3.5 billion. In addition to fee inflation, it has been shown that “upcoding” of wisdom teeth extraction (i.e. using an insurance code for payment of a higher fee than is clinically justified) has become an increasing problem for insurers. Insurance claims patterns clearly show that this procedure is largely treated as an elective procedure. The average annual income per oral surgeon has been estimated to be approximately $500,000 for third molar extraction fees alone. Insurance companies have historically reported that reimbursement for third molar extractions has been the highest reimbursed surgical procedure—even higher than hysterectomies in years when medical insurance used to pay for both procedures.
The market demographics and associated expenses are compelling. Over 77% of children at age 6 have all four third molar tooth buds radiographically detectable on routine panographic X-rays (a type of volume scan). Over 90% of all teenagers in the United States have at least one third molar that will fully form. A typical cost for an oral surgeon to remove all four third molars on a teenager is generally $2,000 to $2,500 per patient once the teeth have at least partially formed—but before they have erupted—including the cost of IV sedation, consultations, and X-ray imaging costs.
There has been considerable controversy for the past fifty years regarding prophylactic extraction of third molars. A number of leading authorities have objectively tried to demonstrate that prophylactic extraction is a waste of healthcare dollars, citing studies that indicate there is no objective scientific evidence for such a procedure, while other groups vigorously argue that prophylactic extraction in the teens and early adult years greatly eliminates more serious problems later in life and is worth the cost and risk.
An important question to ask is, “What happens if no prophylactic third molar extractions occur?” For instance, “as many as 22% of all emergency department visits” at a United States military support facility were related to dental problems, most of which were third-molar specific. In third-world countries, where prophylactic extraction of wisdom teeth is simply not performed, a high percentage of patients will present with acute infections, decay, gum disease and other problems later in life. In Jordan—where prophylactic extraction is not performed—46% of adult patients had pathology (decay, infection, bone loss, etc.) detectable on their third molars on routine X-rays and volume scans. Numerous studies show that third molars are hard to clean, generally do not erupt fully, and are the single most-likely teeth to have problems associated with them.
Routine panographic X-rays of adults taken during a random two-week period are shown in
The problem all practitioners face is that it is practically impossible to tell in advance which impacted wisdom teeth will ultimately cause future pathology. The reality is that most wisdom teeth (well over 50%) are surgically extracted prophylactically with no real knowledge that they will actually cause future pathology.
If pathology appears in patients over the age of 40, however, the stakes are much different. According to two prospective studies in the United States, in 1997 10.5% and in 2002 17.3% of patients requiring third molar extractions were over the age of 40. If a patient is presenting later in life to have one or more third molar extracted, it is because active pathology has been diagnosed, making surgery no longer elective. The attendant complication rates are not just higher, but these patients were categorized as “very high risk patients” for surgery. These studies concluded, “[t]he risk to patients and to the profession can be dramatically reduced by considering early removal of abnormal third molars” and “based on our experience, we propose extraction of third molars during adolescence when the X-ray indicates normal eruption cannot be expected due to lack of space or an abnormal position.”
The occurrence of post-operative complications is generally considered to be over 15% by most independent researchers. For instance, the formation of long-term periodontal pockets on the distal surfaces of second molars that results in gum disease, infection, and eventual second molar tooth loss is estimated to be over 10% due to the damage and poor bone morphology that result from third molar extraction surgery. The incidence of post-operative infections and “dry sockets” is generally accepted to be over 15%. Temporary paraesthesia due to damage to the mandibular nerve or the lingual nerve is over 10%, with residual permanent numbness of the lip or tongue present in approximately 1.5% of all patients. Recently, it has been concluded that approximately 23% of all cases of long-term Temporomandibular Joint (“TMJ”) dysfunction and chronic joint pain are attributable to third molar extraction surgeries.
Malpractice claims against dental practitioners relating to third molar extractions are at an all time high. Litigation for residual TMJ problems is increasing; in 2002 a North Carolina jury awarded $5 million in damages to a patient with TMJ pain following third molar extractions. The incidence of litigation over permanent numbness of the lip has dramatically increased in recent years. Malpractice claims with resulting payouts have been reported to be as high as two-thirds of all claims made against dental practitioners when nerve damage is involved.
If the wisdom teeth are not extracted in adolescence, the roots will fully form, making future extraction difficult and dramatically increasing the incidence of serious complications if surgery should later be required. The damage induced by long-standing, chronic infections in adults may necessitate the extraction not only of the third molars when they become symptomatic, but also of the adjacent second molars. Additional complications include the reduced healing response of adults as compared to adolescents, and the economic hardship induced by having to miss work. Many references indicate that prophylactic extraction of third molars in teens and young adults—in spite of the possibility of lifelong complications such as nerve damage—is justified to avoid the non-elective third molar extraction in adults over the age of 30.
Complications can be severe, even requiring hospitalization when teeth have been extracted on an out-patient basis. There have even been reports of patients who died as a direct result of wisdom tooth extractions.
As an example,
Once the tooth starts to form, the tooth bud starts to become encased in bone and appears to be “pushed down” into the mandible and maxilla as the child's jaw bone grows out and around the tooth bud with age. Future surgical access becomes far more invasive as the bone encases the forming third molar. Given the basic physiology involved, early intervention is the only approach that will eliminate the complications and high costs associated with extraction of fully formed third molars later in life.
The idea of prophylactic third molar tooth bud removal is not new. In 1936, Dr. Henry supported the surgical enucleation of tooth buds, and it was again supported in the mid 70s by several practitioners using somewhat invasive surgical techniques to physically access the tooth buds and mechanically cut them out. In 1979, Drs. Gordon and Laskin used cryoprobes to enucleate third molar tooth buds in dogs. However, at the NIH Conference On Third Molars in 1979 it was concluded that “[a]lthough there are cogent reasons for early removal of third molars, the group felt that the suggested practice of enucleation of third molar tooth buds, based on predictive studies at age 7 to 9, is not currently acceptable.” (National Institutes of Health—Removal Of Third Molars Consensus Development Conference Statement—1979.)
Early removal of partially formed third molars (sometimes referred to as a “germectomy”) where the enamel of the crown has completely formed but less than one-third of the root length has formed, is demonstrated to be somewhat less invasive and carries no demonstrated long-term complications or risks associated with early-stage surgery. However, it is still highly invasive and generally requires IV sedation of the teenage patient. The American Association of Oral & Maxillofacial Surgeon's White Paper On Third Molar Data references five studies involving over 1,100 germectomies with not a single case of a long-term complication (nerve injury, etc.) associated with the surgery. Further, since the germectomies were carried out on teenagers, there were no economic hardships induced by missing work. The White Paper understates the obvious conclusions associated with early intervention: “It does appear that early third molar removal may be associated with a lower incidence of morbidity and also less economic hardship from time off work for the patient.” However, it can also be concluded that there is a tremendous conflict of interest because this paper was written by oral surgeons. To date there is still no measurable shift by dental practitioners to change the way in which third molars are screened, diagnosed, and extracted (i.e. early extraction), indicating that there is a need to fundamentally change the way this condition is being surgically managed.
There are a number of existing alternative technical approaches that can be considered for prophylactic enucleation of third molar tooth buds before the crown or root begins formation in children age 6 to 10. These technical approaches include ablation procedures using different types of ablation means. Exemplary ablation procedures include electrosurge tissue ablation (rats), cryoablation (dogs), laser ablation (dogs), and the use of a scalpel (humans). All but the first three ablation procedures (microwave ablation, radio frequency ablation, and irreversible electroporation) have significant limitations due to being highly invasive, high in cost, requiring cumbersome equipment, or due to the limited means of mechanical access in the oral cavity. Nor do these ablation procedures offer the potential for real-time feedback control to contain collateral tissue damage. To date, the only documented trial of any form of tooth bud ablation procedure utilizing ablation technology that is currently used in mainstream medicine is cryoablation (although preliminary animal trials have been completed using electrosurgical power and lasers).
The article entitled “Selectively Preventing Development Of Third Molars In Rats Using Electrosurgical Energy” by Silvestri et al. describes a pilot study that tests the hypothesis that third molars can be selectively prevented from developing. To test the hypothesis, a study was conducted in which thirty-three neonate rats received electrosurgical energy to the mucosal surfaces of one of their maxillary tuberosities. In this study, guides (insulating plastic positioning devices that housed the electrosurgical probes) were used. The guides were fabricated using the mouths of euthanized rat pups of the same age as the rats that were to be treated as a mold for creating the guides. Then, the electrosurgical probe placed so that its stainless steel tip extended less than 1.0 mm beyond the plastic positioning device to ensure contact with the external surface of the oral mucosa of the maxillary tuberosity. Finally, when in position, the rat pups received a single, unilateral, momentary pulse of monopolar electrosurgical energy to the external surface of the gum tissue of their maxillary tuberosity regions. It should be emphasized that this surface application of electrosurgical energy acted first to unnecessarily kill the overlying gum tissue, then bore a hole through the gum tissue, and otherwise damage not only the tooth buds, but other nearby tissue. The rats were cared for, but after the experimental period, were euthanized to determine the effectiveness of the procedure. The results were that ten rats showed no intra-oral or radiographic evidence of third molar development (and most of these rats subsequently developed palatal deformities), and six developed smaller-than-normal third molars. The conclusion was that maxillary third molars could be selectively prevented from developing in rat pups at or near the time of tooth bud initiation. It was recognized, however, that electrosurgical energy was too powerful and uncontrollable to reliably confine its damage to only the tooth-forming tissues.
Described herein is a method for creating a tooth bud ablation system including a custom surgical stent and an ablation probe tip for use in a tooth bud ablation procedure that results in the agenesis of a tooth in a patient. The method preferably includes the following steps: (a) measuring a three-dimensional location and volume of a tooth bud of the patient to obtain three-dimensional location measurements and volume measurements; (b) obtaining the ablation probe tip, the ablation probe tip having a shaft and a center of ablation, the center of ablation positioned on the shaft; (c) calculating a pre-defined angle to guide the ablation probe tip so that the center of ablation is within the tooth bud, the calculations of the pre-defined angle being based on the three-dimensional location measurements and volume measurements; (d) calculating a pre-defined depth to limit the depth of the ablation probe tip so that the center of ablation is within the tooth bud, the calculations of the pre-defined depth being based on the three-dimensional location measurements and volume measurements; and (e) creating the custom surgical stent with at least one surgical guide corresponding to at least one tooth bud surgical site, the at least one surgical guide having guiding structure, the at least one surgical guide being a passageway through the surgical stent, the passageway being sized to guide placement of the ablation probe tip only at the pre-defined angle, the at least one surgical guide having mechanical stop structure to limit the depth of the ablation probe tip to the pre-defined depth.
Described herein is a tooth bud ablation procedure that results in tooth agenesis, including the steps of: (a) physically seating a custom surgical stent having at least one surgical guide so the at least one surgical guide corresponds to at least one tooth bud surgical site; (b) using the at least one surgical guide, making a surgical access path at the at least one tooth bud surgical site; (c) using the at least one surgical guide, guiding placement of an ablation probe tip having a center of ablation so that the center of ablation is in the middle of a tooth bud at the at least one tooth bud surgical site; and (d) at least partially ablating at least one tooth bud.
Described herein is a tooth bud ablation system for use in a tooth bud ablation procedure that results in tooth agenesis, the system including: (a) a custom surgical stent with at least one surgical guide corresponding to at least one tooth bud surgical site; (b) an ablation probe tip having a center of ablation; and (c) the at least one surgical guide having structure for guiding placement of the ablation probe tip so that the center of ablation is in the middle of a tooth bud by inserting the ablation probe tip through the at least one surgical guide.
Described herein is an ablation procedure including the steps of: (a) physically seating a custom surgical stent having at least one surgical guide so the at least one surgical guide corresponds to at least one lesion or tumor surgical site; (b) using the at least one surgical guide, making a surgical access path at the at least one lesion or tumor surgical site; (c) using the at least one surgical guide, guiding placement of an ablation probe tip having a center of ablation so that the center of ablation is in the middle of a lesion or tumor at the at least one lesion or tumor surgical site; and (d) at least partially ablating at least one lesion or tumor.
Described herein is an ablation procedure including the steps of: (a) physically seating a custom surgical stent having at least one surgical guide so the at least one surgical guide corresponds to at least one lesion or tumor surgical site; (b) using the at least one surgical guide, guiding placement of an ablation probe tip having a center of ablation so that the center of ablation is in the middle of a lesion or tumor at the at least one lesion or tumor surgical site; and (c) at least partially ablating at least one lesion or tumor.
Described herein is a method for volume scanning both hard tissues and soft tissues of a patient, the method including the steps of: (a) using an impression of a material visible in a volume scan; (b) generating a volume scan in which hard tissue is visible and the impression is visible, and soft tissue being “visible” as the space between the visible hard tissue and the visible impression; and (c) providing results of the step of generating a volume scan for the purpose of manufacturing or fabricating a custom surgical stent having at least one surgical guide for guiding placement of an ablation probe tip.
Described herein is a method for simultaneous volume scanning of both hard tissues and soft tissues, the method including the steps of: (a) using a dental impression of a material visible in a volume scan; (b) physically seating the dental impression in a patient's mouth; (c) volume scanning the patient's mouth while the dental impression is seated therein; (d) the step of volume scanning generating a volume scan in which hard tissue is visible and the dental impression is visible, and soft tissue is “visible” as the space between the visible hard tissue and the visible dental impression; and (e) providing the results of the step of volume scanning for the purpose of manufacturing or fabricating a custom surgical stent having at least one surgical guide for guiding placement of an ablation probe tip.
Described herein is a method for manufacturing or fabricating a custom surgical stent, the method including the steps of: (a) using a volume scan image in which hard tissue is visible and a dental impression is visible, and soft tissue is “visible” as the space between the visible hard tissue and the visible dental impression; and (b) manufacturing or fabricating a custom surgical stent with at least one ablation probe tip guide for guiding at least one ablation probe tip to a pre-defined angle and depth of ablation based on information obtained from the volume scan image.
Described herein is a tooth bud ablation procedure that results in tooth agenesis, including the steps of: (a) pre-operatively taking measurements to determine a three-dimensional location of the middle of a tooth bud; (b) placing an ablation probe tip having a center of ablation so that the center of ablation is in the three-dimensional location of the middle of a tooth bud; and (c) at least partially ablating at least one tooth bud.
Described herein is a custom surgical stent for use in a tooth bud ablation procedure that results in tooth agenesis, the custom surgical stent for use with an ablation probe tip having a center of ablation, the stent including: (a) a custom surgical stent with at least one surgical guide corresponding to at least one tooth bud surgical site; (b) the at least one surgical guide having guiding structure to guide placement of an ablation probe tip at a pre-defined angle so that a center of ablation of the ablation probe tip is in the middle of a tooth bud; and (c) the at least one surgical guide having mechanical stop structure to limit the depth of the ablation probe tip to a pre-defined depth.
The foregoing and other objectives, features, and advantages of the invention will be more readily understood upon consideration of the following detailed description of the invention, taken in conjunction with the accompanying drawings.
The accompanying drawings are incorporated in and constitute a part of this specification.
The highly invasive surgical procedure of extracting third molars can be completely eliminated by prophylactically eliminating the small tooth buds that will eventually form the wisdom teeth. Children age 6 to 12 will generally have radiographically detectable tooth buds with no signs of tooth formation inside the tooth bud. Third molar tooth bud agenesis (the lack of third molar formation) can only be conclusively determined by age 14. Third molar tooth buds are lying just 2.0 mm to 3.0 mm beneath the surface of the attached gingival (gum) tissue, making them accessible for rapid anesthesia and minimally invasive ablation with the correct selection of soft tissue ablation and supporting scanning and stent-manufacturing technologies.
By successfully improving existing medical technology, the highly invasive, painful, and complication-ridden procedure of traditional surgical removal of third molars (i.e. “wisdom teeth” extractions) can be replaced with a minimally invasive tooth bud ablation (TBA) procedure 70 such as that shown in
The TBA procedure 70 (
One preferred advantage of the surgical phase 90 described herein is that it is a minimally invasive surgical procedure. With a minimally invasive surgical procedure design coupled with electronic feedback controls using MW and RF ablation technology to limit soft tissue damage, performing this procedure on children aged 6-12 years old takes approximately thirty (30) (or fewer) minutes, including the time to administer local anesthetics.
Another preferred advantage of the surgical phase 90 described herein is that it will not accidentally disrupt adjacent second molar tooth development, even though the formation of second molars are well under way because these tooth buds 120 have started to form before birth. The use of relatively new scanning technologies (e.g. computed tomography volume scanning such as cone beam computed tomography (CBCT) scanning and MRI volume scanning) and accurate custom surgical stents 110 to guide ablation probe tip 108 placement will eliminate the risk of accidentally disrupting the second molars by minimizing collateral tissue damage.
Summarily, the TBA procedure 70 (
A TBA system 100 (
The TBA System 100
The TBA system 100 described herein is the system that is used during the surgical phase 90 of the TBA procedure 70. Some of the components (e.g. the custom surgical stent 110 and the pre-determined settings 105) used in the TBA system 100 are part of the TBA surgical kit assembled during the pre-surgical phase 80.
The TBA system 100, as shown in
Generator 104
The generator 104 provides the ablation means 104′ suitable for ablating a tooth bud 120 during the surgical phase 90 of the TBA procedure 70. MW energy and RF energy are discussed as exemplary preferred ablation means 104′. Another alternative preferred ablation means 104′ is irreversible electroporation because it has subsecond activation times that can reduce collateral tissue damage. Yet another alternative preferred ablation means 104′ include, but are not limited to, cryoablation, ultra-high intensity ultrasound, laser, chemical, thermal or hot tip (e.g. a tip having any source of heat including, but not limited to, a light bulb, a soldering iron, or steam heat), and/or mechanical means. These ablation means 104′ may also be combined either simultaneously or consecutively. It should also be noted that other known and yet-to-be-developed ablation means 104′ may also be used. It should be noted that although discussed primarily in terms of MW and RF, unless specifically set forth otherwise, the use of other ablation means 104′ is possible.
The generator 104 (alone or as part of an ablation probe unit 102) may be programmed by the operator and/or at the laboratory and/or factory and may be accomplished automatically or manually. The programming of the generator 104 may include programming at least one pre-determined setting 105.
The following bulleted points are exemplary details and/or features that may be incorporated in preferred generators 104.
Hand Piece 106
The hand piece 106 is the functional intermediary between the generator 104 and the ablation probe tip 108. The hand piece 106 may be connected substantially at one end to the generator 104. Substantially at the other end of the hand piece 106, opposite the generator 104, the end of the hand piece 106 (the surgical end) is adapted to accept the ablation probe tip 108. The hand piece 106 is preferably detachable from the generator 104 (if they are not an integral unit) and the ablation probe tip 108 is preferably detachable from the hand piece 106.
The following bulleted points are exemplary details and/or features that may be incorporated in preferred hand pieces 106.
Ablation Probe Tip 108
One end of the ablation probe tip 108 has structure suitable for connecting it to the hand piece 106. The ablation means 104′ flows from the generator 104 through the ablation probe tip 108 and out to a center of ablation 130a (the focal point of the ablation). The ablation probe tip 108 is insertable through the surgical guide 112, through the gingival tissue 122, and into the middle of the tooth bud 130b. The center of ablation 130a is at the insertion end of the ablation probe tip 108 such that when the insertion end of the ablation probe tip 108 is positioned at the pre-defined angle (ϕ) and pre-defined depth (x) during the surgical phase 90, the center of ablation 130a substantially coincides with or overlaps the middle of the tooth bud 130b.
The pre-defined angle (ϕ) is the angle at which the ablation probe tip's effective center of ablation 130a is in the “middle” of the tooth bud 130b as calculated (during the pre-surgical phase 80) as described herein or using an alternative method. The pre-defined depth (x) is the depth at which the ablation probe tip's effective center of ablation 130a is in the “middle” of the tooth bud 130b as calculated as described herein or using an alternative method. The phrase “middle of the tooth bud 130b” is meant to include the three-dimensional area within the tooth bud 120 and, in particular, the three-dimensional area within the tooth bud 120 that is more towards the absolute middle point than towards the outer periphery of the tooth. The pre-defined angle (ϕ) and pre-defined depth (x) can also be referred to as the “calculated angle and depth,” the “prescribed angle and depth,” the “proper angle and depth,” the “correct angle and depth,” the “optimal angle and depth,” or the “ideal angle and depth.”
The ablation probe tip 108 includes a mechanical stop structure 140 (e.g. a band, protrusion, or shoulder) designed to physically limit the depth of the ablation probe tip 108 when used in conjunction with mechanical stop structure 142 (e.g. the upper surface, a protrusion on the upper surface, or a notch in the upper surface) of the surgical stent 110 and/or surgical guide 112. In other words, the mechanical stop structure 142 of the surgical guide 112 and the mechanical stop structure 140 of the ablation probe tip 108 together limit how much of the ablation probe tip 108 can pass through the surgical guide 112 until there is a mechanical stop between the mechanical stop structure 142 of the surgical guide 112 and the mechanical stop structure 140 of the ablation probe tip 108.
Each ablation probe tip 108 may be individually custom made (e.g. manufactured or fabricated) or may be selected from a family of ablation probe tips 108 (i.e. there may be a “family” of probe tips 108 that will cover all clinical possibilities for tooth bud diameters and depths). In the manufacturing or fabricating of the surgical stents 110, however, the characteristics of the ablation probe tip 108 (custom made or selected) that may be taken into consideration include, for example, length, shape, angle, position of a mechanical stop structure 140, diameter, and size, shape, and location of the center of ablation 130a. For example, if a particular ablation probe tip 108 had mechanical stop structure 140 (shown as the bottom surface of an annular ring or shoulder in
The ablation probe tips 108 may be sharp enough and/or may be strong enough so that the ablation probe tips 108 can be “self-introducing” in that the ablation probe tips 108 can be pushed through the gingival tissue 122. Alternatively, if tissue trocars 146 (described herein) are to be used, the ablation probe tips 108 would not have to be as sharp and/or strong.
The following bulleted points are exemplary details and/or features that may be incorporated in preferred ablation probe tips 108.
Stent 110
The at least one custom surgical stent 110 (also referred to as a “stent 110” or a “surgical stent 110”) has at least one surgical guide 112 (also referred to as “guides 112” or “ablation probe tip guides 112”). Two surgical stents 110 would be used, for example, if both upper and lower tooth buds 120 were to be ablated. The surgical stents 110 are designed to seat in a patient's mouth and may be supported by at least one tooth (a tooth-supported surgical stent), soft tissue (a soft tissue-supported surgical stent), and/or bone (a bone-supported surgical stent). If the surgical stent 110 is supported by more than one of these, it could be considered a combination-supported surgical stent. Preferred surgical stents 110 may “snap” into the mechanical undercuts inherent in the patient's erupted teeth. A surgical stent 110 would have more than one surgical guide 112 if more than one tooth bud were to be ablated on either the upper or lower jaw.
The surgical stents 110 and the guides 112 therein are used to control both the pre-defined angle (ϕ) and the pre-defined depth (x) of the ablation probe tip 108 in order to assure that the ablation probe tip's effective center of ablation 130a is in the middle of the tooth bud 130b±0.5 mm. The pre-defined angle (ϕ) is primarily controlled by the angle of the surgical guides 112 (the passageways through the stent 110). The pre-defined depth (x) is primarily controlled by the interaction between the mechanical stop structure 142 of the surgical stent 110 (and/or surgical guide 112) and the mechanical stop structure 140 of the ablation probe tip 108. The operator inserts the ablation probe tip 108 at the entry angle (ϕ) defined by the guide 112 and to the depth (x) limited by the mechanical stop structure 140, 142.
The surgical guides 112 are passageways through the surgical stent (the passageways being a type of guiding structure). The pre-defined angle (ϕ) for each passageway (guide 112) is determined by the position of the middle of the tooth bud 130b. For example, if the middle of the tooth bud 130b is “slightly forward” the angle (ϕ) of the passageway (guides 112) would be “slightly forward” so that the ablation probe tip 108 is angled “slightly forward” so that the center of ablation 130a is positioned substantially at the middle of the tooth bud 130b. The angle (ϕ) of the passageway is determined (e.g. calculated) by the software based upon tooth bud volumes determined in pre-surgical volume scanning 82. In addition to providing a path through which the ablation probe tip 108 accesses the gingival tissue and the tooth bud, the guides 112 may also be used to provide access for administering local anesthetic and to provide access to a tissue trocar 146 (if necessary).
In the shown preferred example, the mechanical stop structure 142 is the upper surface of the surgical stent 110 and/or surgical guide 112. The mechanical stop structure 142 is substantially adjacent to or near the surgical guide 112. The mechanical stop structure 142, however, could be positioned at locations of the surgical stent 110 beyond the surgical guide 112. Alternative preferred mechanical stop structure 142 includes a protrusion on the upper surface or a notch in the upper surface. The size and shape of the mechanical stop structure 142 is determined (calculated or designed) by a process that may be implemented as software or as a program and is based upon tooth bud volumes determined in pre-surgical volume scanning 82 as well as the length between the ablation probe tip mechanical stop structure 140 and its center of ablation 130a. For example, if the middle of the tooth bud 130b is 2.5 mm below the surface (determined in pre-surgical volume scanning 82), and the available ablation probe tips 108 have a length (between their respective mechanical stop structure 140 and its center of ablation 130a) of 2.4 mm and 2.6 mm, the process (that may be implemented by software or a program) would determine that the 2.6 mm ablation probe tip 108 is the appropriate ablation probe tip 108 (the 2.4 mm ablation probe tip 108 being too short), but that the surgical stent 110 and/or surgical guide 112 would have to be approximately 0.1 mm thick to make up the difference or the 2.6 mm ablation probe tip 108 would be able to be pushed in too far.
The following bulleted points are exemplary details and/or features that may be incorporated in preferred stents 110.
Pre-Determined Settings 105
The pre-determined settings 105 include, for example, pre-determined parameter settings 105a and/or treatment time settings 105b that are needed to control (provide instructions to) the generator 104 (alone or as part of an ablation probe unit 102) to provide sufficient ablation means 104′ to ablate the tooth bud 120, but not so much as to incur significant collateral soft tissue damage (e.g. to the gingival tissue 122). For example, the pre-determined parameter settings 105a might control the quantity and quality ablation means 104′ delivered to the tooth bud 120. The actual pre-determined parameter settings 105a will be highly dependent on the type of ablation means 104′ to be delivered. For example, MW and RF ablation means might have parameters relating to wavelength and/or frequency, hot tip ablation means might have parameters relating to temperature, chemical ablation means might have parameters relating to the strength of the chemical and how fast the chemical is flowing into the tooth bud, and mechanical ablation means might have parameters relating to speed.
The pre-determined settings 105 are determined (which includes computing, calculating, looking up, processing, or otherwise determining) by a process (that may be implemented as software or a program) based upon tooth bud volumes determined in pre-surgical volume scanning 82. It should be noted that the pre-determined settings 105 may take into consideration factors other than tooth bud volume including, but not limited to, image recognition programs to measure tooth bud location, age and size of the patient, and other relevant factors to successfully image the patient for the TBA procedure 70.
The generator 104 (and/or the ablation probe unit 102) may be programmed by the operator and/or technicians at the laboratory and/or factory. The programming may be automatic or manual. “Programming” includes having the pre-determined settings 105 pre-entered and/or entering (inputting) the pre-determined settings 105 manually or automatically into the generator 104 (and/or the ablation probe unit 102) via operator input mechanisms. For example, the pre-determined settings 105 may be preprogrammed into an ablation probe unit 102, transmitted to the operator in the form of a programming signal (e.g. over the internet to be downloaded and installed in the ablation probe unit 102 or the generator 104), provided in the form of computer-readable media (e.g. a disc or a solid state USB drive), and/or provided as data (or a code) that may be manually entered into the ablation probe unit 102 (or the generator 104). Ideally, whichever method of entering/programming the ablation probe unit 102 (or the generator 104) is used, operator error is considered and eliminated as much as possible and appropriate checks are used. Preprogramming and some of the other means for programming the ablation probe unit 102 (or the generator 104) with the pre-determined settings would help to eliminate operator input errors. Another example of means for eliminating errors is that even if the ablation probe unit 102 (or the generator 104) is preprogrammed by the laboratory, the pre-determined settings might be displayed to the user for independent “verification” as the user could notice variations from normal pre-determined settings (e.g. the literature provided might provide a range and the operator would notice if the provided pre-determined settings 105 fell outside of the range). Yet another example is that the pre-determined settings might be provided as a code that, when input, would only function if it corresponded with a logical setting (e.g. if the person's age was also input into the ablation probe unit 102 and the code was not a logical setting based on the age, the ablation probe unit 102 would not function).
The pre-determined settings 105 for each TBA site may be included in the TBA surgical kit as a print out, on a disk or other computer readable storage media, or with instructions on how to obtain or download the information.
The pre-determined ablation means parameter settings 105a can also be referred to as “parameter settings 105a,” “preferred parameter settings 105a,” “optimal parameter settings 105a,” “ideal parameter settings 105a,” “pre-determined parameter settings 105a,” “recommended parameter settings 105a,” or “prescribed parameter settings 105a.”
Tissue Trocar 146
If the ablation probe tip 108 is not self-introducing, at least one sharp instrument (that is preferably disposable) such as a tissue trocar 146 (and sometimes a plurality of tissue trocars) may be used by the operator to introduce (initially create) the access opening through the thick attached gingival tissue 122 that overlays third molar tooth buds 120. The tissue trocar tips are preferably sharp enough to be pushed and/or punched through the gingival tissue 122 into the base of the tooth bud. The diameter of the tissue trocar 146 rapidly increases up to 100% of the size of the ablation probe tip 108. After the tissue trocar 146 has created the access opening, the tissue trocar 146 is removed and the ablation probe tip 108 is immediately placed into the access opening.
TBA Surgical Kit
The TBA surgical kit is a package that includes the majority of the necessary components and information for the surgical phase 90 of the TBA procedure 70. The TBA kit will be assembled (or the assembly will be completed) based on the patient's impressions and volume scans. Preferably, the TBA surgical kit has attractive packaging.
Using the TBA procedure 70 described herein, the effective center of ablation 130a of the ablation probe tip 108 can be positioned at a pre-defined angle (ϕ) and pre-defined depth (x) so that the ablation probe tip's effective center of ablation 130a is positioned substantially in the “middle” of the tooth bud 130b within approximately 50%, 25%, or even less than 10% of the average diameter of the tooth bud 120. This is extremely accurate as compared to previous procedures.
(1) Screening Phase 72
Routine screening using panographic or intra-oral X-ray imaging techniques is necessary to identify the presence of forming tooth buds 120 starting at age 6 through age 12 because of the wide range of ages involved with the formation of third molar tooth buds 120.
(2) Impressions and Scanning of Pre-Surgical Phase 80
Once third molar tooth buds 120 have been identified to be present using standard screening methods (screening phase 72), the next step is to pre-operatively measure the precise three-dimensional location and volume of each third molar tooth bud 120. This may be practically accomplished using scanning technology 86 (e.g. computed tomography volume scanning such as CBCT). Scanning technology 86 can be used to accurately generate the necessary three-dimensional volume scans (computed tomography volume scans) and measurements±0.2 mm using, for example, the distal side of erupted first molars as durable physical landmarks (although it is possible to use soft tissue over bone as landmarks). The scanning technology 86 produces tooth bud size and position data 86′ (also referred to as “volume scans” and/or “measurements”) that is provided for the step of producing the TBA surgical kit 88. The tooth bud size and position data 86′ may be provided as a scanning technology file that can be any data file generated by the scanning technology 86 with the data necessary to manufacture or fabricate a stent 110. One exemplary type of scanning technology file is a three-dimensional computer aided design (CAD) file.
An impression 84 of the patient's teeth and gum tissue (gingival tissue 122) is made using standard impression materials such as PVS-type impression material (although other impression materials can be used). The impressions 84 are then processed and/or scanned using scanning technology (e.g. CBCT imaging by dentists and/or CT imaging in the laboratory), and the resulting volume scan of the impression is emailed (or otherwise transmitted or delivered) to a laboratory and/or factory where the volume scan is used for manufacturing or fabricating. It is still possible to physically mail the PVS dental impressions 84 to the designated laboratory and/or factory for manufacturing or fabricating.
Although the scanning technology is discussed primarily in terms of computed tomography volume scanning (e.g. CBCT technology), alternative scanning technologies including, but not limited to, ultrasound scanning technologies and future developed scanning technologies are included in the scope of the invention. Specialty software or programs may be used with the scanning technology 86 to accomplish the purpose described herein. It should be noted that alternative scanning technology 86 (including future developed scanning technology) may be used if it is able to accurately generate the necessary three-dimensional volume scans and measurements±0.2 mm using the distal side of erupted first molars (or other landmarks) as durable physical landmarks. It should be noted that alternative scanning technology (including future developed scanning technology) may also be used as long as two- or three-dimensional scanning results in the positioning of the effective center of ablation 130a within approximately 50%, 25%, or even less than 10% of the average diameter of the tooth bud 120.
(3) Assembling a TBA Surgical Kit 88
The pre-surgical phase 80 of the TBA procedure 70 includes assembling a TBA surgical kit 88. This step of assembling a TBA surgical kit 88 preferably includes computing pre-determined settings 105 and manufacturing or fabricating the stent 110 based on tooth bud size and position data 86′ obtained from the scanning technology 86. The process of computing pre-determined settings 105 may be controlled by a process (that may be implemented by software or a program). The process of manufacturing or fabricating the stent 110 may also be controlled by a process (that may be implemented by software or a program).
After the impressions 84 are processed and/or scanned and the tooth bud size and position data 86′ is obtained, the process of manufacturing or fabricating the stent 110 may be carried out using direct-digital manufacturing or fabricating techniques similar to the processes used for manufacturing or fabricating implant surgical stents directly from CBCT scans (e.g. the processes used for fabricating SurgiGuide™ and other implant surgical guides) and the process used for manufacturing or fabricating orthodontic aligners (e.g. orthodontic aligners made by Align Technology or ClearCorrect). The direct-digital manufacturing or fabricating techniques, however, use the tooth bud size and position data 86′ to position and angle the surgical guides 112 on the distal aspects of the surgical stents 110 and use the erupted first molars as the primary landmark for positioning. Although manufacturing or fabricating will usually be done remotely in a laboratory and/or factory, it is possible that larger clinics will have the ability to manufacture or fabricate surgical stents 110 in their own in-house laboratory and/or factory.
Direct-digital manufacturing or fabricating techniques can be defined as any manufacturing or fabricating process that creates physical parts directly from data (e.g. three-dimensional CAD files) using manufacturing or fabricating techniques including, but not limited to, surgical stent manufacturing or fabricating technologies, rapid turn-around fabrication technologies, computer aided manufacturing (CAM), technologies using CAD, computer numerical control (CNC) milling, “additive” manufacturing, direct-digital laser stereolithography fabrication, “3-D printing,” or any other manufacturing or fabricating means known or yet to be discovered that is capable of using the results generated by scanning to manufacture or fabricate the custom surgical stents. Because of the possibility for the integrated use of direct-digital volume scanning of impressions, low manufacturing costs, and rapid turn around times, use of direct-digital manufacturing or fabricating techniques is one preferred manufacturing or fabricating technique, but more traditional manufacturing or fabricating techniques that require more labor intensive manual laboratory processing could also be used.
At least one process that may be implemented as software or as at least one program (e.g. custom software enhancements in the CBCT software) will preferably assist in the direct-digital manufacturing or fabricating of the surgical stents 110 and define (and/or compute or calculate) the pre-determined settings 105. This process would include defining (and/or computing or calculating) positioning and entry angle data required for placement of the ablation probe tip's effective center of ablation 130a into the middle of the targeted tooth bud 120. Additionally, tooth bud volumes are preferably computed (possibly using the scanning technology) and then the tooth bud volumes are used to determine the pre-determined settings 105 necessary to effect therapeutic ablation. Tooth bud volumes will generally range from 4.0 mm to 12.0 mm in diameter at ages 6-12. The ablation means 104′ and treatment times are preferably considered in the calculations. Companies that make CBCT imaging equipment promote the development of procedure-specific software in order to gain end-user acceptance of their imaging systems in the market place. The process may use calculations and/or look-up charts (e.g. based on experimental data) for determining the necessary settings.
As described above, in addition to the surgical stent(s) 110 and the pre-determined settings 105, the TBA surgical kit may include at least one ablation probe tip 108 labeled for its respective surgical site, at least one tissue trocar 146 (if necessary), and patient and operator identification.
The TBA surgical kit is provided to the operator.
(4) Surgical Phase 90
Summarily, as shown in
The operator preferably starts the surgical phase 90 by placing the surgical stent 110 into place onto the patient's teeth prior to administering local anesthetic to the surgical site. The local anesthetic will then be administered through the surgical stent 110 and guides 112 that are in close approximation with the gingival tissue 122, thus reducing the amount of anesthetic necessary because of the precise placement of anesthetic agent. Achieving local anesthesia in this procedure will be easier than anesthetizing lower permanent molar teeth for routine fillings since only soft tissues, which will be 8.0 mm to 15.0 mm deep, are involved.
The step of physically seating a surgical stent 110 may also include physically seating the surgical stent in a patient's mouth, physically seating the surgical stent on a patient's erupted teeth, physically seating the surgical stent on at least one tooth in a patient's mouth, physically seating the surgical stent on a patient's soft tissue, physically seating the surgical stent on a patient's bone, or a combination of the above steps (e.g. physically seating the surgical stent on a patient's teeth, soft tissue, and bone).
Once the custom surgical stent 110 is in place and the patient is fully anesthetized, the operator then mechanically gains access to the tooth bud 120 through the stent surgical guides 112 by creating (introducing) a small surgical access path opening through the gingival tissue 122 approximately 0.1 mm to 2.0 mm (and more particularly 0.5 mm to 1.0 mm) in diameter using tissue trocars. If the ablation probe tips 108 are designed to be strong enough and sharp enough to act as “self-introducing” probe tips, they can be used to introduce the surgical access path. On the other hand, if the ablation probe tip itself is not self-introducing, the surgical access path may be introduced using a then there will be no need for separate tissue trocar 146.
It should be noted that the surgical access path is preferably an incision, a puncture, or a hole through the gingival tissue 122. If a self-introducing probe tip is used, the surgical access path has substantially the same diameter as the ablation probe tip 108. If the probe tip is not self-introducing, the surgical access path may be a sutureless puncture (0.1 mm to 2.0 mm in diameter) or, more particularly, a sutureless puncture (0.5 mm to 1.0 mm in diameter). Alternatively, a trocar “punch” may be made through tough gingival tissue 122. Regardless of the procedure used to introduce the surgical access path, using a surgical access path to gain access or allow placement of the ablation probe tips 108 to the tooth bud 120 does not kill, damage, or otherwise cause necrosis to the surrounding soft tissues (e.g. gingival tissues 122). This can be compared to other processes such as coring, boring, cutting, electrosurge ablating, or other invasive procedures that kill, damage, and/or otherwise cause necrosis to the soft tissue to which the invasive procedure has been applied. Although the preferred procedures for introducing the surgical access path might kill individual cells, the soft tissue (the gingival tissue 122) does not become necrosed because the tissue is a collection of cells that can heal itself.
As shown in
(5) Post-Surgical Phase 98:
After the surgical phase 90, the patient may have follow-up including, but not limited to, post-surgical instructions and, if necessary follow-up care and screening.
Post-surgical instructions that may be given to parents includes the following: kids can go out and play immediately unless they were sedated, no post-surgical pain medication is necessary, bleeding (if any) will be gone in minutes, and post-surgical X-ray screening may be necessary at patient's next routine 6-month hygiene cleaning appointment to verify full ablation.
Simulated TBA Procedure 70
The following paragraphs, along with
As shown in
The laboratory and/or factory uses the impressions 84 and volume scan data (scanning technology file) to create (including calculating, manufacturing, fabricating, selecting, and/or assembling) components of the TBA system 100 (including the surgical stents 110 and the pre-determined settings 105). The surgical stents 110 and the pre-determined settings 105 and other components are then assembled into the TBA surgical kit to be provided to the operator.
The surgical stent(s) 110 and the pre-determined setting(s) 105 are provided to the operator along with the rest of the TBA surgical kit.
Prior to the surgical phase 90 of the TBA procedure 70, the ablation probe unit 102 and/or the generator 104 should be set up so that at least one pre-determined setting 105 is correctly entered for at least one tooth bud 120 with safety interlocks carefully considered. (The pre-determined settings 105 may all be entered prior to the surgical phase 90 or they may be entered one at a time.) The surgical phase 90 of the TBA procedure 70 may then be performed.
The ablation means 104′ is delivered in this position (
The ablation probe tip 108 would then be removed and the process repeated at the site of each tooth bud 120. Once the entire surgical phase 90 is complete, the surgical stents 110 are removed.
Finally, the dental practitioner or an assistant provides post-surgical instructions to the patient or a caregiver of the patient.
Alternative Scanning and Fabrication of Custom TBA Surgical Kits
An alternative to the pre-surgical phase 80 of the TBA procedure 70 described above includes simultaneous three-dimensional scanning of both hard tissues (bone and teeth) and soft tissues (tooth bud 120 and gingival tissue 122). From the information obtained using this unique simultaneous three-dimensional scanning, a custom surgical stent 110 may be manufactured or fabricated. As discussed, the custom surgical stent 110 is used in the surgical phase 90 to help with the placement of the center of ablation 130a into a tooth bud 120 that results in tooth agenesis.
The simultaneous three-dimensional scanning uses a single scan to obtain both soft tissue and hard tissue information. Soft tissue information generally does not show on a scan, although progress in volume scanning is improving and this may be possible in the near future. Known and future technologies able to provide a scan image of soft tissue are included in the scope of this invention. A typical X-ray scan will only show the hard tissue. So to obtain both soft and hard tissue information using simultaneous three-dimensional scanning, a dental impression 84 is used that can be viewed on an X-ray. The dental impression 84 is made of materials that are preferably “contrast optimized” for high resolution X-ray volume scanning. The ideal level of contrast agent in the range of 25% to 75% radiopacity (such as barium or iodine based compounds) is mixed into the dental impression materials so that the highest level of surface detail can be picked up on when volume scanning the dental impression 84. The dental impression 84 is placed in the patient's mouth 124 during the X-ray volume scan. The resulting X-ray volume scan image would show the tooth distinguished (is visible) and the dental impression 84 distinguished (is visible) and the void therebetween would be the soft tissue and would therefore be “visible.” The resulting X-ray volume scan with both hard and soft tissue information may then be used to formulate the custom stent 110 used in the surgical phase 90 described herein. In other words, an X-ray volume scan image is generated in which hard tissue (e.g. a tooth) is visible hard tissue and the dental impression 84 is a visible dental impression and soft tissue (e.g. gingival tissue 122) is “visible” as the space between the visible hard tissue and the visible dental impression.
One separate preferred pre-surgical phase 80 of the TBA procedure 70 preferably includes using X-ray volume scans of dental impressions 84 to manufacture or fabricate surgical stents 110. The X-ray volume scan of the dental impression 84 is “super imposed” over the patient X-ray volume scan (e.g. CBCT scanning) using the dental hard tissues (the teeth) to “snap” the two volume scans together into an accurate overlay so that soft tissues of the mouth (which cannot be X-ray volume scanned directly) are accurately defined for the surgical stent manufacturing or fabricating (which must take into account the soft tissue and teeth) and probe positioning (which must take into account the tooth bud positioning from the patient's CBCT scan).
One separate preferred pre-surgical phase 80 of the TBA procedure 70 preferably includes using dental impression materials that are “contrast optimized” for high resolution X-ray volume scanning that is then used to manufacture or fabricate surgical stents 110. The ideal level of contrast agent (such as barium or iodine based compounds) is mixed into the dental impression materials so that the highest level of surface detail can be picked up on when CT volume scanning the dental impression 84.
Alternative Procedures and Systems
Separate preferred surgical procedures preferably include the ablation of “non-tooth” bud lesions or tumors of the maxilla or mandible. In such a situation, a custom stent would be manufactured or fabricated with guides to guide an ablation probe tip 108 to such a lesion or tumor located at least one lesion or tumor surgical site. The process could then be used to ablate such lesion or tumor.
Separate TBA surgical procedures preferably include the use of ultrasound scanning with combined ultra-high energy ultrasound ablation but without the use of a surgical stent for transgingival tooth bud ablation that results in tooth agenesis. This can be described as direct ultrasound scanning with ultra-high energy ultrasound built into the same scanning head.
Comparison to the Silvestri Study
As set forth in the Background section of this document, the article entitled “Selectively Preventing Development Of Third Molars In Rats Using Electrosurgical Energy” by Silvestri et al. describes a pilot study that tests the hypothesis that third molars can be selectively prevented from developing. The results of the Silvestri study were mixed at best, with only ten rats out of thirty-three showing the desired result of no intraoral or radiographic evidence of third molar development. One reason that the Silvestri process was not successful may have had to do with the fact that the Silvestri process was inexact. For example, the Silvestri process relies on molds taken from molds of the mouths of euthanized rat pups rather than using molds fabricated for the rat pup on which the procedure was to be performed. The present invention uses the patient's mouth on which the procedure is to be performed. Another way in which the Silvestri process was inexact was that the Silvestri process did not locate the forming tooth bud 120. More specifically, the Silvestri process did not locate or determine the location of the forming tooth bud 120 pre-operatively relative to the landmarks that he used. Silvestri even states “ . . . when electrosurgical energy is applied near the invisible tooth anlage in the tiny mouth of newborn rats, the effects of the electrosurgical energy cannot be nearly as local or precise. The embryonic tooth-forming tissues of the third molar [lay] fractions of a millimeter below the oral mucosa and cannot be seen. As a result, it was not possible to predictably protect and isolate the vulnerable developing bone from the energy and heat of the electrosurgical energy. The result was a relatively large, unpredictable area of tissue damage during treatment and a wide range of bony developmental effects seen after the rats were euthanized.” The TBA procedure 70 described herein can be distinguished from the Silvestri procedure in several ways including for example, that (1) the TBA procedure 70 described herein is a minimally invasive procedure consisting of introducing a surgical access path at each tooth bud surgical site as opposed to the boring, killing, and damaging procedure described by Silvestri, (2) the TBA procedure 70 described herein is performed in such a manner that it can be described as exact (e.g. using the patient's mouth as the mold for manufacturing or fabricating the surgical stent 110, taking exact measurements of the patient's mouth (including the position of the tooth bud 120), and using calculated parameter and time settings 105b) as opposed to the Silvestri procedure that can be described as inexact, and (3) the TBA procedure 70 described herein can predictably ablate tooth buds 120 as opposed to the Silvestri procedure that was essentially unpredictable and could never, under any circumstances, be considered for treating human patients.
Flow Charts
It is to be understood that the inventions, examples, and embodiments described herein are not limited to particularly exemplified materials, methods, and/or structures. Further, all publications, patents, and patent applications cited herein, whether supra or infra, are hereby incorporated by reference in their entirety.
Please note that the terms and phrases may have additional definitions and/or examples throughout the specification. Where otherwise not specifically defined, words, phrases, and acronyms are given their ordinary meaning in the art. The following paragraphs provide some of the definitions for terms and phrases used herein.
It should be noted that the terms “may” and “might” are used to indicate alternatives and optional features and only should be construed as a limitation if specifically included in the claims. It should be noted that the various components, features, steps, phases, or embodiments thereof are all “preferred” whether or not it is specifically indicated. Claims not including a specific limitation should not be construed to include that limitation.
It should be noted that, unless otherwise specified, the term “or” is used in its nonexclusive form (e.g. “A or B” includes A, B, A and B, or any combination thereof, but it would not have to include all of these possibilities). It should be noted that, unless otherwise specified, “and/or” is used similarly (e.g. “A and/or B” includes A, B, A and B, or any combination thereof, but it would not have to include all of these possibilities). It should be noted that, unless otherwise specified, the term “includes” means “comprises” (e.g. a device that includes or comprises A and B contains A and B but optionally may contain C or additional components other than A and B). It should be noted that, unless otherwise specified, the singular forms “a,” “an,” and “the” refer to one or more than one, unless the context clearly dictates otherwise.
The terms and expressions that have been employed in the foregoing specification are used as terms of description and not of limitation, and are not intended to exclude equivalents of the features shown and described. This application is intended to cover any adaptations or variations of the present invention. It will be appreciated by those of ordinary skill in the art that any arrangement that is calculated to achieve the same purpose may be substituted for the specific embodiment shown. It is also to be understood that the following claims are intended to cover all of the generic and specific features of the invention herein described and all statements of the scope of the invention which, as a matter of language, might be said to fall therebetween.
The present application is a continuation of U.S. patent application Ser. No. 15/886,729, filed Feb. 1, 2018. U.S. patent application Ser. No. 15/886,729 is a continuation of U.S. patent application Ser. No. 15/694,794, filed Sep. 2, 2017. U.S. patent application Ser. No. 15/694,794 is a continuation of U.S. patent application Ser. No. 13/093,842, filed Apr. 26, 2011 (which issued as U.S. Pat. No. 9,827,068 on Nov. 28, 2017). U.S. patent application Ser. No. 13/093,842 is a continuation of U.S. patent application Ser. No. 12/863,183, filed Jul. 15, 2010 (which issued as U.S. Pat. No. 9,402,693 on Aug. 2, 2016). U.S. patent application Ser. No. 12/863,183 is a national stage filing under 35 U.S.C. 371 of International Application No. PCT/US10/34259, filed May 10, 2010. International Application No. PCT/US10/34259 is an international application claiming the benefit under 35 U.S.C. Section 119(e) of U.S. Provisional Patent Application Ser. No. 61/177,143, filed May 11, 2009. The present application is also a continuation of U.S. patent application Ser. No. 15/694,794, filed Sep. 9, 2017. The present application is also a continuation of U.S. patent application Ser. No. 15/694,791, filed Sep. 9, 2017. The present application is also a continuation of U.S. patent application Ser. No. 13/093,844, filed Apr. 26, 2011. The present application is based on and claims priority from these applications, the disclosures of which are hereby expressly incorporated herein by reference in their entirety.
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Number | Date | Country | |
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20190247144 A1 | Aug 2019 | US |
Number | Date | Country | |
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61177143 | May 2009 | US |
Number | Date | Country | |
---|---|---|---|
Parent | 15886729 | Feb 2018 | US |
Child | 16391277 | US | |
Parent | 15694794 | Sep 2017 | US |
Child | 15886729 | US | |
Parent | 13093842 | Apr 2011 | US |
Child | 15694794 | US | |
Parent | 12863183 | US | |
Child | 13093842 | US | |
Parent | 15694794 | Sep 2017 | US |
Child | 16391277 | US | |
Parent | 15694791 | Sep 2017 | US |
Child | 16391277 | US | |
Parent | 13093844 | Apr 2011 | US |
Child | 16391277 | US |