Patent Grant
11076879
The following commonly assigned U.S. patent applications and U.S. patents are incorporated herein by reference in their entireties:
The present disclosure relates generally to treatment systems and shallow surface applicators. Several embodiments are directed to applicators with shallow cups with airflow features for air removal.
Excess body fat, or adipose tissue, may be present at various locations of a subject's body and may detract from personal appearance. Aesthetic improvement of the human body often involves the selective removal of adipose tissue located at the abdomen, thighs, buttocks, knees, submental region, face and arms, as well as other locations. Invasive procedures (e.g., liposuction), however, tend to be associated with relative high costs, long recovery times, and increased risk of complications. Injection of drugs for reducing adipose tissue can cause significant swelling, bruising, pain, numbness, and/or induration.
Conventional non-invasive treatments for reducing adipose tissue often include regular exercise, application of topical agents, use of weight-loss drugs, dieting, or a combination of these treatments. One drawback of these non-invasive treatments is that they may not be effective or even possible under certain circumstances. For example, when a person is physically injured or ill, regular exercise may not be an option. Topical agents and orally administered weight-loss drugs are not an option if, as another example, they cause an undesirable reaction, such as an allergic or negative reaction. Additionally, non-invasive treatments may be ineffective for selectively reducing specific regions of adiposity, such as localized adipose tissue along the hips, abdomen, thighs, or the like.
Conventional non-invasive vacuum cooling devices suck a fold of skin between two spaced apart cooled plates that are generally parallel to one another. The cooling device can cool and thermally damage targeted tissue. Only opposites sides of the skin fold contact the cooled plates, which limits the cooling capabilities of the cooling devices. Additionally, the end of the tissue fold located in a gap between the plates may experience pooling of blood. A vacuum may cause rupturing of blood vessels and lead to bruising of the skin located in the gap. Accordingly, conventional invasive and non-invasive treatments are not suitable for many subjects and cannot effectively target certain regions of tissue.
In the drawings, identical reference numbers identify similar elements or acts.
The present disclosure describes treatment systems, applicators, and methods for affecting targeted sites. Several embodiments are directed to non-invasive systems that cool/heat specific regions or volumes of tissue. The non-invasive systems can include applicators with thermally-conductive cooling cups for cooling the skin surface. An applicator can include one or more airflow features that facilitate thermal contact with the tissue. The airflow features can include one or more air-egress features along which air flows to reduce, limit, or substantially eliminate air between the subject's skin and the cup before and/or during treatment. The air-egress features can include small gaps, channels, ridges, protrusions, or other suitable features for defining fluid flow paths. Several of the details set forth below are provided to describe the following examples and methods in a manner sufficient to enable a person skilled in the relevant art to practice, make, and use them. Several of the details and advantages described below, however, may not be necessary to practice certain examples and methods of the technology. Additionally, the technology may include other examples and methods that are within the scope of the technology but are not described in detail.
Some aspects of the technology are directed to an apparatus that includes an applicator with a temperature-controlled patient contact surface having a topography for providing airflow channels. The airflow channels can extend between a vacuum port and a peripheral portion of the patient contact surface when the patient's tissue is operably received within a cavity of the applicator. The vacuum port can provide communication between the cavity and a pressurization device, such as a vacuum source. The topography of the patient contact surface can be selected to assist in the elimination or reduction of air gaps when the patient's tissue is drawn to the cavity, distribute the vacuum throughout the cavity (e.g., distribute the vacuum along the patient contact surface), and/or otherwise facilitate air removal. In some embodiments, a cup and the vacuum port are configured such that when a vacuum is applied the subject's tissue substantially fills an entire volume of the cup except for small gaps created by air-egress features formed on a surface of the cup.
One aspect the technology is directed to an applicator configured to cool tissue. The applicator can include a cup, at least one vacuum port, and air-egress features. The cup can define a tissue-receiving cavity and can include a temperature-controlled surface. The air-egress features can extend along the temperature-controlled surface to provide airflow paths to the vacuum port to enhance air removal between the subject's skin and the cup while the subject's tissue is pulled toward the temperature-controlled surface. The applicator can draw in air such that the subject's tissue fills most or substantially all of the tissue-receiving cavity. In some embodiments, a vacuum can be drawn to pull the skin into thermal contact with a large area of the cup, thereby providing a relatively large skin/cup interface for heat transfer. For example, the temperature-controlled surface can extend continuously along spaced apart sidewalls and bottom of the cooling cup and can thermally contact an area of the subject's skin that is equal to or less than about 20 cm2, 40 cm2, 80 cm2, 100 cm2, 140 cm2, 160 cm2, 180 cm2, 200 cm2, 300 cm2, or other suitable area. Air can escape via the air-egress features to eliminate air gaps that would impair heat-transfer with the subject's skin. The temperature-controlled conductive surface, including the airflow features, can be cooled to a temperature equal to or lower than a selected temperature (e.g., 5° C., 0° C., −2° C., −5° C., −7° C., −10° C., −15° C., −20° C., −25° C., etc.). In some embodiments, most of the temperature-controlled conductive surface can be cooled to a temperature equal to or lower than about 0° C., −2° C., −5° C., −10° C., or −15° C.
In some embodiments, an apparatus for treating a human subject includes an applicator configured to cool the subject's skin. The applicator includes a cup, at least one vacuum port, and air-egress features. The cup defines a tissue-receiving cavity. The air-egress features can extend along the temperature-controlled surface to provide airflow paths to the vacuum port for removing air located between the subject's skin and the cup while the vacuum port provides a vacuum to draw the subject's tissue toward the temperature-controlled surface. In some embodiments, the air-egress features include channels, ridges, protrusions, or the like.
In certain procedures, one or more liners, cryoprotectant, or other suitable elements can be positioned between the subject's skin and the cup. The liner can have an adhesive surface for adhering to the cup and can be perforated to allow airflow therethrough. The liner assembly can be made, in whole or in part, of plastic, rubber, or other suitable material and can include, without limitation, one or more sealing members, sensors, release liners, carriers, alignment features, or the like. In other procedures, the subject's skin can directly contact the cup.
Some of the embodiments disclosed herein can be for cosmetically beneficial alterations of target regions. Some cosmetic procedures may be for the sole purpose of altering a target region to conform to a cosmetically desirable look, feel, size, shape and/or other desirable cosmetic characteristic or feature. Accordingly, at least some embodiments of the cosmetic procedures can be performed without providing an appreciable therapeutic effect (e.g., no therapeutic effect). For example, some cosmetic procedures may not include restoration of health, physical integrity, or the physical well-being of a subject. The cosmetic methods can target subcutaneous regions to change a human subject's appearance and can include, for example, procedures performed on a subject's submental region, abdomen, hips, legs, face, neck, ankle region, or the like. In other embodiments, however, cosmetically desirable treatments may have therapeutic outcomes (whether intended or not), such as psychological benefits, alteration of body hormone levels (by the reduction of adipose tissue), etc.
Reference throughout this specification to “one example,” “an example,” “one embodiment,” or “an embodiment” means that a particular feature, structure, or characteristic described in connection with the example is included in at least one example of the present technology. Thus, the occurrences of the phrases “in one example,” “in an example,” “one embodiment,” or “an embodiment” in various places throughout this specification are not necessarily all referring to the same example. Furthermore, the particular features, structures, routines, stages, or characteristics may be combined in any suitable manner in one or more examples of the technology. The headings provided herein are for convenience only and are not intended to limit or interpret the scope or meaning of the technology.
The applicator 102 can be used to perform medical treatments to provide therapeutic effects and/or cosmetic procedures for cosmetically beneficial effects. Without being bound by theory, selective effects of cooling are believed to result in, for example, membrane disruption, cell shrinkage, disabling, disrupting, damaging, destroying, removing, killing and/or other methods of lipid-rich cell alteration. Such alteration is believed to stem from one or more mechanisms acting alone or in combination. It is thought that such mechanism(s) trigger an apoptotic cascade, which is believed to be the dominant form of lipid-rich cell death by non-invasive cooling. In any of these embodiments, the effect of tissue cooling can be the selective reduction of lipid-rich cells by a desired mechanism of action, such as apoptosis, lipolysis, or the like. In some procedures, the applicator 102 can cool the skin surface and/or targeted tissue to cooling temperature in a range of from about −25° C. to about 20° C. In other embodiments, the cooling temperatures can be from about −20° C. to about 10° C., from about −18° C. to about 5° C., from about −15° C. to about 5° C., or from about −15° C. to about 0° C. In further embodiments, the cooling temperatures can be equal to or less than −5° C., −10° C., −15° C., or in yet another embodiment, from about −15° C. to about −25° C. Other cooling temperatures and temperature ranges can be used.
Apoptosis, also referred to as “programmed cell death”, is a genetically-induced death mechanism by which cells self-destruct without incurring damage to surrounding tissues. An ordered series of biochemical events induce cells to morphologically change. These changes include cellular blebbing, loss of cell membrane asymmetry and attachment, cell shrinkage, chromatin condensation and chromosomal DNA fragmentation. Injury via an external stimulus, such as cold exposure, is one mechanism that can induce cellular apoptosis in cells. Nagle, W. A., Soloff, B. L., Moss, A. J. Jr., Henle, K. J. “Cultured Chinese Hamster Cells Undergo Apoptosis After Exposure to Cold but Nonfreezing Temperatures” Cryobiology 27, 439-451 (1990).
One aspect of apoptosis, in contrast to cellular necrosis (a traumatic form of cell death causing local inflammation), is that apoptotic cells express and display phagocytic markers on the surface of the cell membrane, thus marking the cells for phagocytosis by macrophages. As a result, phagocytes can engulf and remove the dying cells (e.g., the lipid-rich cells) without eliciting an immune response. Temperatures that elicit these apoptotic events in lipid-rich cells may contribute to long-lasting and/or permanent reduction and reshaping of subcutaneous adipose tissue.
One mechanism of apoptotic lipid-rich cell death by cooling is believed to involve localized crystallization of lipids within the adipocytes at temperatures that do not induce crystallization in non-lipid-rich cells. The crystallized lipids selectively may injure these cells, inducing apoptosis (and may also induce necrotic death if the crystallized lipids damage or rupture the bi-lipid membrane of the adipocyte). Another mechanism of injury involves the lipid phase transition of those lipids within the cell's bi-lipid membrane, which results in membrane disruption or dysfunction, thereby inducing apoptosis. This mechanism is well-documented for many cell types and may be active when adipocytes, or lipid-rich cells, are cooled. Mazur, P., “Cryobiology: the Freezing of Biological Systems” Science, 68: 939-949 (1970); Quinn, P. J., “A Lipid Phase Separation Model of Low Temperature Damage to Biological Membranes” Cryobiology, 22: 128-147 (1985); Rubinsky, B., “Principles of Low Temperature Preservation” Heart Failure Reviews, 8, 277-284 (2003). Other possible mechanisms of adipocyte damage, described in U.S. Pat. No. 8,192,474, relate to ischemia/reperfusion injury that may occur under certain conditions when such cells are cooled as described herein. For instance, during treatment by cooling as described herein, the targeted adipose tissue may experience a restriction in blood supply and thus be starved of oxygen due to isolation as a result of applied pressure, cooling which may affect vasoconstriction in the cooled tissue, or the like. In addition to the ischemic damage caused by oxygen starvation and the buildup of metabolic waste products in the tissue during the period of restricted blood flow, restoration of blood flow after cooling treatment may additionally produce reperfusion injury to the adipocytes due to inflammation and oxidative damage that is known to occur when oxygenated blood is restored to tissue that has undergone a period of ischemia. This type of injury may be accelerated by exposing the adipocytes to an energy source (via, e.g., thermal, electrical, chemical, mechanical, acoustic, or other means) or otherwise increasing the blood flow rate in connection with or after cooling treatment as described herein. Increasing vasoconstriction in such adipose tissue by, e.g., various mechanical means (e.g., application of pressure or massage), chemical means or certain cooling conditions, as well as the local introduction of oxygen radical-forming compounds to stimulate inflammation and/or leukocyte activity in adipose tissue may also contribute to accelerating injury to such cells. Other yet-to-be understood mechanisms of injury may exist.
In addition to the apoptotic mechanisms involved in lipid-rich cell death, local cold exposure is also believed to induce lipolysis (i.e., fat metabolism) of lipid-rich cells and has been shown to enhance existing lipolysis which serves to further increase the reduction in subcutaneous lipid-rich cells. Vallerand, A. L., Zamecnik. J., Jones, P. J. H., Jacobs, I. “Cold Stress Increases Lipolysis, FFA Ra and TG/FFA Cycling in Humans” Aviation, Space and Environmental Medicine 70, 42-50 (1999).
One expected advantage of the foregoing techniques is that the subcutaneous lipid-rich cells in the target region can be reduced generally without collateral damage to non-lipid-rich cells in the same region. In general, lipid-rich cells can be affected at low temperatures that do not affect non-lipid-rich cells. As a result, lipid-rich cells, such as those associated with highly localized adiposity (e.g., adiposity along the abdomen, submental adiposity, submandibular adiposity, facial adiposity, etc.), can be affected while non-lipid-rich cells (e.g., myocytes) in the same generally region are not damaged. The unaffected non-lipid-rich cells can be located underneath lipid-rich cells (e.g., cells deeper than a subcutaneous layer of fat), in the dermis, in the epidermis, and/or at other locations.
In some procedures, the treatment system 100 can remove heat from underlying tissue through the upper layers of tissue and create a thermal gradient with the coldest temperatures near the cooling surface, or surfaces, of the applicator 102 (i.e., the temperature of the upper layer(s) of the skin can be lower than that of the targeted underlying target cells). It may be challenging to reduce the temperature of the targeted cells low enough to be destructive to these target cells (e.g., induce apoptosis, cell death, etc.) while also maintaining the temperature of the upper and surface skin cells high enough so as to be protective (e.g., non-destructive). The temperature difference between these two thresholds can be small (e.g., approximately, 5° C. to about 10° C., less than 10° C., less than 15° C., etc.). Protection of the overlying cells (e.g., typically water-rich dermal and epidermal skin cells) from freeze damage during dermatological and related aesthetic procedures that involve sustained exposure to cold temperatures may include improving the freeze tolerance and/or freeze avoidance of these skin cells by using, for example, cryoprotectants for inhibiting or preventing such freeze damage.
Tissue can be rapidly rewarmed as soon as practicable after a freeze event has occurred to limit, reduce, or prevent damage and adverse side effects associated with the freeze event. After freezing begins, tissue can be rapidly warmed as soon as possible to minimize or limit damage to tissue, such as the epidermis. In some procedures, tissue is partially or completely frozen for a predetermined period of time and then warmed. According to one embodiment, an applicator can warm shallow tissue using, for example, thermoelectric elements in the device. Thermoelectric elements can include Peltier devices capable of operating to establish a desired temperature (or temperature profile) along the surface. In other embodiments, the applicator outputs energy to warm tissue. For example, the applicator can have electrodes that output radiofrequency energy for warming tissue. In some procedures, the tissue can be warmed at a rate of about 1° C./s, 2° C./s, 2.5° C./s, 3° C./s, 5° C./s, or other rate selected to thaw frozen tissue after the tissue has been partially or completely frozen for about 10 seconds, 30 seconds, 1 minute, 2 minutes, 5 minutes, 10 minutes, or other suitable length of time.
The air-egress features 180 can help distribute the vacuum across the cup/tissue interface to enhance patient comfort and prevent air gaps at the tissue/cup interface during tissue draw. After the subject's tissue fills the tissue-receiving cavity 170, the air-egress features 180 can distribute the vacuum across a large area of the tissue-cup interface. During subcutaneous treatments, the subject's skin can extend across the air-egress features 180, illustrated as channels spreading outwardly from a central region 150 of the cup 168. Constant or varying vacuum levels can be used to keep the tissue in thermal contact with the cup 168. In some embodiments, the vacuum port 176 is positioned at the central region 150 to draw the tissue into the deepest region of the tissue-receiving cavity 170, and the air-egress features 180 extend toward a peripheral portion 181 of the temperature-controlled surface 174. The air-egress features 180 can be a network of elongate protrusions, ridges, and/or channels positioned at locations at which air tends to become trapped. If ambient air is inadvertently sucked between the cup 168 and the subject's skin, it can serve as a thermal insulator and reduce heat transfer between the applicator 102 and the subject's tissue. Such air can be removed via the air-egress features 180 to maintain suitable thermal contact throughout the entire treatment session, including relatively long sessions (e.g., sessions equal to or longer than 20 minutes, 30 minutes, 45 minutes, 1 hour, or 2 hours).
Each air-egress feature 180 can include a first end 192 spaced apart from a mouth 194 of the cup 168, a second end 195 positioned proximate a vacuum port 197, and a main portion 198 extending between the first and second ends 192, 195. Most or substantially all of the skin surface of the volume of tissue in the cavity 170 can be in thermal contact with the cup 168. In some procedures, the vacuum level can be sufficiently high to keep the tissue in contact with the bottom of the cup 168 to keep the cavity 170 filled with tissue but can be sufficiently low to limit or minimize pooling of blood, vascular damage (e.g., rupturing of blood vessels), bruising, and other complications often associated with vacuum-based procedures. Upon completion of the cryotherapy procedure, the applicator 102 can release the tissue (e.g., by reducing or stopping the vacuum) and can be used at another treatment site.
The base unit 152 can include cooling units 200 coupled to, embedded in, or otherwise in thermal communication with the temperature-controlled surface 174. The cooling units 200 can include, without limitation, one or more thermoelectric elements 202 (e.g., Peltier-type elements), fluid-cooled elements 204, heat-exchanging units, or combinations thereof. In a cooling mode, fluid-cooled elements 204 can cool the backside of the thermoelectric elements 202 to keep the thermoelectric elements 202 at or below a target temperature. In a heating mode, fluid-cooled elements 200 can heat the backside of the thermoelectric elements 202 to keep the thermoelectric elements 202 at or above a target temperature. In some embodiments, the cooling units 200 include only fluid-cooled elements or only non-fluid-cooled elements. The cooling units 200 can be embedded or otherwise disposed in the cup 168 to reduce the distance from the tissue to the thermoelectric elements 202. Although the illustrated embodiment has two cooling units 200, it can have any desired number of cooling units 200. The number, positions, configurations, and operating temperatures of the cooling units can be selected based on cooling/heating suitable for treatment, desired power consumption, or the like.
Referring again to
The connector 104 can also include one or more electrical lines 112 for providing power to the applicator 102 and one or more control lines 116 for providing communication between the control module 106 (
Referring again to
A pressurization device 123 can provide suction to the applicator 102 via the vacuum line 125 (
Air pressure can be controlled by a regulator located between the pressurization device 123 and the applicator 102. The control module 106 can control the vacuum level to, for example, install the liner assembly and/or draw tissue into the applicator 102 while maintaining a desired level of comfort. If the vacuum level is too low, a liner assembly, tissue, etc. may not be drawn adequately (or at all) into and/or held within the applicator 102. If the vacuum level is too high when preparing the applicator, a liner assembly can break (e.g., rupture, tear, etc.). If the vacuum level is too high during treatment, the patient can experience discomfort, bruising, or other complications. According to certain embodiments, approximately 0.5 inch Hg, 1 inch Hg, 2 inches Hg, 3 inches Hg, 5 inches Hg, 7 inches Hg, 8 inches Hg, 10 inches Hg, or 12 inches Hg vacuum is applied to draw or hold the liner assembly, tissue, etc. In some embodiments, the air-egress features 180 can be configured to maintain the airflow paths when 12 inches Hg vacuum level is used to draw tissue into the tissue-receiving cavity 170. The number, dimensions, and positions of the air-egress features 180 can be selected to achieve desired tissue contact. Other vacuum levels can be selected based on the characteristics of the tissue, desired level of comfort, and vacuum leakage rates. Vacuum leak rates of the applicator 102 can be equal to or less than about 0.2 LPM, 0.5 LPM, 1 LPM, or 2 LPM at the pressure levels disclosed herein. For example, the vacuum leak rate can be equal to or less than about 0.2 LPM at 8 inches Hg, 0.5 LPM at 8 inches Hg, 1 LPM at 8 inches Hg, or 2 LPM at 8 inches Hg. The configuration of the pressurization device 123 and applicator 102 can be selected based on the desired vacuum levels, leakage rates, and other operating parameters.
The power supply 110 can provide a direct current voltage for powering electrical elements of the applicator 102 via the line 112 (
Different vacuum levels can be utilized during treatment sessions. For example, relatively strong vacuums can be used to pull the subject's tissue into the applicator. A weaker vacuum can be maintained to hold the subject's tissue against the thermally conductive surface. If suitable thermal contact is not maintained (e.g., the subject's skin moves away from the thermally conductive surface), the vacuum level can be increased to reestablish suitable thermal contact. In other procedures, a generally constant vacuum level can be used throughout the treatment session.
If the treatment system 100 includes multiple applicators, a treatment profile can include specific profiles for each applicator to concurrently or sequentially treat multiple treatment sites, including, but not limited to, sites along the subject's torso, abdomen, legs, buttock, legs, face and/or neck (e.g., submental sites, submandibular sites, etc.), knees, back, arms, ankle region, or other treatment sites. The vacuum levels can be selected based on the configuration of the cup. Strong vacuum levels can be used with relatively deep cups whereas weak vacuum levels can be used with relatively shallow cups. The vacuum level and cup configuration can be selected based on the treatment site and desired volume of tissue to be treated. In some embodiments, the controller 114 can be incorporated into the applicator 102 or another component of the treatment system 100.
The air-egress features 180 can be spaced apart from one another or interconnected to define an airflow pattern suitable for evacuating air. Referring now to
Referring now to
With reference to
At block 502, an applicator can be applied to the subject's skin. The applicator can be prepared for treatment by installing an appropriate contoured lip, liner, etc. for the treatment site. As discussed in connection with
With reference to
Different sealing elements or cups can be installed on the base unit 152 for treatment flexibility. The geometries of the contoured sealing element 151 and cup 168, which can be replaced, can be selected to conform to a contour of a cutaneous layer. The sides, waistline, and other features of the contoured heads can be selected to facilitate conformation of heads to the contours of individual target areas. For example, the shape of a typical human torso may vary between having a relative large radius of curvature, e.g., on the stomach or back, and having a relatively small radius of curvature, e.g., on the abdominal sides. Moreover, the size of a cup having an approximately consistent curvature may vary. The sealing elements may be fitted to individual lipid-rich cell deposits to achieve an approximately air-tight seal, achieve the vacuum pressure for drawing tissue into an interior cavity for treatment, maintain suction to hold the tissue, massage tissue (e.g., by altering pressure levels), and use little or no force to maintain contact between an applicator and a patient.
Components can be attached and detached in a plurality of combinations to achieve a desired contour for a treatment. Accordingly, a single base unit and/or umbilical cable may be combined with a set of interchangeable heads and/or cups to form a wide variety of contours for treating different lipid-rich cell deposits in a cost effective manner. Further, a practitioner performing the treatment can demonstrate their expertise to the patient by tailoring the applicator contour to the specific body parts being treated. In this manner, the patient understands that their treatment is customized to their body for better comfort and for better treatment results.
Tissue-receiving cavities disclosed herein can have substantially U-shaped cross sections, V-shaped cross sections, or partially circular/elliptical cross-sections, as well as or other cross sections suitable for receiving tissue. Thus, thermal properties, shape, and/or configuration of the cup 168 can be selected based on, for example, target treatment temperatures and/or volume of the targeted tissue. Embodiments of the base units for treating large volumes of tissue (e.g., adipose tissue along the abdomen, hips, buttock, etc.) can have a maximum depth equal to or less than about 2 cm, 5 cm, 10 cm, 15 cm, 20 cm, or 30 cm, for example. Embodiments of the base units for treating small volumes (e.g., a small volume of submental tissue) can have a maximum depth equal to or less than about 0.5 cm, 2 cm, 2.5 cm, 3 cm, or 5 cm, for example. The maximum depth of the tissue-receiving cavity 170 can be selected based on, for example, the volume of targeted tissue, characteristics of the targeted tissue, and/or desired level of patient comfort.
At block 504, a vacuum can be drawn while the sealing element 151 can be held against the subject. To draw the vacuum, the pressurization device 123 (
In some treatments, tissue can be drawn into the tissue-receiving cavity 170 such that substantially all of the skin surface within the cavity 170 overlies the temperature-controlled surface 174. For example, 90%, 95%, 95%, or more of the surface area of the skin located in the cavity 170 can overlie the temperature-controlled surface 174. The number and dimensions of the air-egress features 180 can be increased or decreased to achieve desired thermal contact for a particular vacuum level. After a sufficient amount of tissue fills most or all of the cavity 170, the pressure level can be controlled to comfortably hold the tissue.
At block 506, the applicator 102 can extract heat from the tissue. The cup 168 can be designed for rapid cooling and/or heating to, for example, reduce treatment times and/or produce generally flat temperature profiles over the heat-exchanging surface 174 or a portion thereof. Because the subject's body heat can be rapidly conducted to the cup 168, the cooled skin can be kept at a generally flat temperature profile (e.g., ±3° C. of a target temperature) even though regions of the skin, or underlying tissue, may experience different amounts of blood flow. Because non-lipid-rich cells usually can withstand colder temperatures better than lipid-rich cells, the subcutaneous lipid-rich cells can be injured selectively while maintaining the non-lipid-rich cells (e.g., non-lipid-rich cells in the dermis and epidermis). Accordingly, subcutaneous lipid-rich cells in a subcutaneous layer can be cooled an amount sufficient to be biologically effective in affecting (e.g., damaging and/or reducing) such lipid-rich cells without affecting non-target cells to the same or greater extent. During cooling/heating, the tissue can fill substantially the entire cavity 170. In various embodiments, the air-egress features 180 can maintain airflow paths extending to the peripheral portion of the cup 168 such that the tissue occupies at least 80%, 90%, 92.5%, or 95% of the volume of the cavity 170. Accordingly, the subject's tissue can substantially fill an entire volume of the cavity 170. In one application, the subject's tissue fills 90% or more of the volume of the cavity 170.
The temperature-controlled surface 174 can thermally contact an area of the subject's skin equal to or less than about 20 cm2, 40 cm2, 80 cm2, 100 cm2, 140 cm2, 160 cm2, 180 cm2, 200 cm2, 300 cm2, 500 cm2, or other suitable area. For example, the temperature-controlled surface area can be, for example, equal to or less than 20 cm2, 40 cm2, 80 cm2, 100 cm2, 140 cm2, 160 cm2, 180 cm2, 200 cm2, 300 cm2, or another suitable area. The temperature-controlled conductive surface 174 can be cooled to a temperature equal to or less than a selected temperature (e.g., 5° C., 0° C., −2° C., −5° C., −7° C., −10° C., −15° C., −20° C., −25° C., etc.) to cool most of the skin surface of the retained tissue. In one embodiment, most of a heat-exchanging surface 161 can be cooled to a temperature equal to or less than about 0° C., −2° C., −5° C., −10° C., or −15° C.
In contrast to invasive procedures in which coolant is injected directly into targeted tissue, the smooth temperature-controlled surface 174 (
Although the illustrated applicator 102 of
Other elements, materials, components (e.g., gel pads, absorbents, etc.) can be located between the skin and the applicators. U.S. Pub. No. 2007/0255362 and U.S. Patent Publication No. 2008/0077201 and U.S. application Ser. No. 14/610,807 disclose components, materials (e.g., coupling gels, cryoprotectants, compositions, etc.), and elements (e.g., coupling devices, liners/protective sleeves, absorbents, etc.) that can be placed between the skin and the applicator. The control module 106 (
It will be appreciated that while a region of the body has been cooled or heated to the target temperature, in actuality that region of the body may be close but not equal to the target temperature, e.g., because of the body's natural heating and cooling variations. Thus, although the applicator 102 may attempt to heat or cool the target tissue to the target temperature or to provide a target heat flux, sensors 512 (
Sensors 512 can be temperature sensors, such as thermistors, positioned to detect temperature changes associated with warm tissue being drawn into and/or located in the cup 168. A control module (e.g., control module 106 of
Sensor feedback can be collected in real-time and used in concert with treatment administration to efficaciously target specific tissue. The sensor measurements can also indicate other changes or anomalies that can occur during treatment administration. For example, an increase in temperature detected by the sensors 512 can indicate either a freezing event at the skin or movement of the applicator 102. An operator can inspect the subject's skin and/or applicator 102 in response to a detected increase in temperature. Methods and systems for collection of feedback data and monitoring of temperature measurements are described in commonly assigned U.S. Pat. No. 8,285,390.
The treatment procedures disclosed herein can also involve use of cryoprotectant between the applicator and skin. The cryoprotectant can be a freezing point temperature depressant that may additionally include a thickening agent, a pH buffer, a humectant, a surfactant, and/or other additives. The temperature depressant may include, for example, polypropylene glycol (PPG), polyethylene glycol (PEG), dimethyl sulfoxide (DMSO), or other suitable alcohol compounds. In a particular embodiment, a cryoprotectant may include about 30% polypropylene glycol, about 30% glycerin (a humectant), and about 40% ethanol. In another embodiment, a cryoprotectant may include about 40% propylene glycol, about 0.8% hydroxyethylcellulose (a thickening agent), and about 59.2% water. In a further embodiment, a cryoprotectant may include about 50% polypropylene glycol, about 40% glycerin, and about 10% ethanol. Other cryoprotectants or agents can also be used and can be carried by a cotton pad or other element. U.S. application Ser. No. 14/610,807 is incorporated by reference in its entirety and discloses various compositions that can be used as cryoprotectants.
It may take a few days to a few weeks, or longer, for the adipocytes to break down and be absorbed. A significant decrease in fat thickness may occur gradually over 1-3 months following treatment. Additional treatments can be performed until a desired result is achieved. For example, one or more treatments can be performed to substantially reduce (e.g., visibly reduce) or eliminate targeted tissue.
During a treatment session, contoured heads, line assemblies, and other components can be quickly replaced any number of times. Other types of heads, contours, and engagement features can be attached to the base unit 103. For example, contour elements disclosed in U.S. Publication 2010/0280582 can be used with the base unit 103, which may have magnets or other alignment features and can provide desired sealing, including generally air-tight seal cincturing. U.S. Publication 2010/0280582 is incorporated by reference in its entirety.
Liners can be used and can include films, sheets, sleeves, or other components suitable for defining an interface surface to prevent direct contact between surfaces of the applicator and the subject's skin to reduce the likelihood of cross-contamination between patients, minimize cleaning requirements, etc. Exemplary protective liners can be sheets, sleeves, or other components constructed from latex, rubber, nylon, Kevlar®, or other substantially impermeable or semi-permeable material. For example, the liner can be a latex sheet coated with a pressure-sensitive adhesive. Further details regarding a patient protection device may be found in U.S. Patent Publication No. 2008/0077201. In some procedures, a liner or protective sleeve may be positioned between an absorbent and the applicator to shield the applicator and to provide a sanitary barrier that is, in some embodiments, inexpensive and thus disposable. After installing the liner assembly, gel traps, filters, valves, and other components can be installed to keep applied substances (e.g., coupling gels, cryoprotectants, etc.) from being sucked into and/or through the base unit 103. In some embodiments, the liner 119 is configured to allow air to pass when drawing a vacuum and to restrict passage of a gel.
Embodiments according to the present disclosure may provide one or more additional advantages. For example, the size, shapes, and other physical properties of the base units, liner assemblies, sealing members, gaskets, contoured heads, and components of the applicators may be selected to accommodate heat removal sources (e.g., thermal devices, cooling devices, etc.) that may be used/reused with individual applicators. Modifications to flexible portions of individual applicators may enable the use of a standard heat removal source and accommodate different contours of individual cutaneous layers. In turn, this may make it possible to reuse base units, sealing members, liners, and/or contoured heads for different treatments. The rigid portions of the applicators (e.g., edge or mounting region of base unit), which are relatively stiff with respect to the flexible portions, provide an attachment point for heat removal sources that may resist bowing into the interior cavity and possibly separating from the heat removal sources when a vacuum (including a partial vacuum) is drawn into the applicators. Disposing temperature sensors inside the applicators, along temperature-controlled surfaces, within contoured heads, along liner assemblies, etc. may more accurately measure the temperature of skin surface, subcutaneous tissue, and so forth. The flexible portions of the applicator (e.g., flexible mouth) also allows some compliance to different subject body contours or geometries.
As illustrated in
In operation, the input module 808 accepts an operator input 819 via the one or more input devices, and communicates the accepted information or selections to other components for further processing. The database module 810 organizes records, including patient records, treatment data sets, treatment profiles and operating records and other operator activities, and facilitates storing and retrieving of these records to and from a data storage device (e.g., internal memory 802, an external database, etc.). Any type of database organization can be utilized, including a flat file system, hierarchical database, relational database, distributed database, etc.
In the illustrated example, the process module 812 can generate control variables based on sensor readings 818 from sensors and/or other data sources, and the output module 814 can communicate operator input to external computing devices and control variables to the controller. The display module 816 can be configured to convert and transmit processing parameters, sensor readings 818, output signals 820, input data, treatment profiles and prescribed operational parameters through one or more connected display devices, such as a display screen 118 (
In various embodiments, the processor 801 can be a standard central processing unit or a secure processor. Secure processors can be special-purpose processors (e.g., reduced instruction set processor) that can withstand sophisticated attacks that attempt to extract data or programming logic. The secure processors may not have debugging pins that enable an external debugger to monitor the secure processor's execution or registers. In other embodiments, the system may employ a secure field programmable gate array, a smartcard, or other secure devices.
The memory 802 can be standard memory, secure memory, or a combination of both memory types. By employing a secure processor and/or secure memory, the system can ensure that data and instructions are both highly secure and sensitive operations such as decryption are shielded from observation. In various embodiments, the memory 802 can be flash memory, secure serial EEPROM, secure field programmable gate array, or secure application-specific integrated circuit. The memory 802 can store instructions for causing the applicators to cool/heat tissue, pressurization devices to draw a vacuum, or other acts disclosed herein. Vacuum levels can be selected based on characteristics of the applicator, airflow features, and/or treatment site. In one embodiment, the memory 802 stores instructions executable by the controller 790 for the thermal device to sufficiently cool conductive cups disclosed herein such that vacuum applicators non-invasively cool the subcutaneous lipid-rich cells to a desired temperature, such as a temperature less than about 0° C. In some embodiments, the memory 802 can contain liner installation or draw instructions for causing the liner to drawn into a, tissue draw instructions for causing the applicator to draw tissue into the applicator, treatment instructions for heating/cooling tissue, tissue release instructions for releasing tissue, and instructions for monitoring treatment. For example, the liner installation or draw instructions can be executed by the controller 790 to command the pressurization device 123 to suck the liner against a conductive surface of the conductive cup.
The input/output device 118 can include, without limitation, a touchscreen, a keyboard, a mouse, a stylus, a push button, a switch, a potentiometer, a scanner, an audio component such as a microphone, or any other device suitable for accepting user input and can also include one or more video monitor, a medium reader, an audio device such as a speaker, any combination thereof, and any other device or devices suitable for providing user feedback. For example, if an applicator moves an undesirable amount during a treatment session, the input/output device 803 can alert the subject and/or operator via an audible alarm. The input/output device 118 can be a touch screen that functions as both an input device and an output device. The control panel can include visual indicator devices or controls (e.g., indicator lights, numerical displays, etc.) and/or audio indicator devices or controls. The control panel may be a component separate from the input/output device 118 and/or output device 120, may be integrated applicators, may be partially integrated with one or more of the devices, may be in another location, and so on. In alternative embodiments, the controller 114 can be contained in, attached to, or integrated with the applicators. Further details with respect to components and/or operation of applicators, control modules (e.g., treatment units), and other components may be found in commonly-assigned U.S. Patent Publication No. 2008/0287839.
The controller 790 can include any processor, Programmable Logic Controller, Distributed Control System, secure processor, and the like. A secure processor can be implemented as an integrated circuit with access-controlled physical interfaces; tamper resistant containment; means of detecting and responding to physical tampering; secure storage; and shielded execution of computer-executable instructions. Some secure processors also provide cryptographic accelerator circuitry. Suitable computing environments and other computing devices and user interfaces are described in commonly assigned U.S. Pat. No. 8,275,442, entitled “TREATMENT PLANNING SYSTEMS AND METHODS FOR BODY CONTOURING APPLICATIONS,” which is incorporated herein in its entirety by reference.
The treatment systems, applicators, and methods of treatment can be used reduce adipose tissue or treat subcutaneous tissue, acne, hyperhidrosis, wrinkles, structures (e.g., structures in the epidermis, dermis, subcutaneous fat, muscle, nerve tissue, etc.), and so on. Systems, components, and techniques for reducing subcutaneous adipose tissue are disclosed in U.S. Pat. No. 7,367,341 titled “METHODS AND DEVICES FOR SELECTIVE DISRUPTION OF FATTY TISSUE BY CONTROLLED COOLING” to Anderson et al., U.S. Patent Publication No. US 2005/0251120 titled “METHODS AND DEVICES FOR DETECTION AND CONTROL OF SELECTIVE DISRUPTION OF FATTY TISSUE BY CONTROLLED COOLING” to Anderson et al., and U.S. Patent Publication No. 2007/0255362 titled “CRYOPROTECTANT FOR USE WITH A TREATMENT DEVICE FOR IMPROVED COOLING OF SUBCUTANEOUS LIPID-RICH CELLS,” the disclosures of which are incorporated herein by reference in their entireties. Vacuum applicators can stretch, stress, and/or mechanically alter skin to increase damage and fibrosis in the skin, affect glands, control freeze events (including initiating freeze events), etc. Methods for cooling tissue and related devices and systems in accordance with embodiments of the present invention can at least partially address one or more problems associated with conventional technologies as discussed above and/or other problems whether or not such problems are stated herein.
Unless the context clearly requires otherwise, throughout the description, the words “comprise,” “comprising,” and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is to say, in a sense of “including, but not limited to.” Words using the singular or plural number also include the plural or singular number, respectively. Use of the word “or” in reference to a list of two or more items covers all of the following interpretations of the word: any of the items in the list, all of the items in the list, and any combination of the items in the list. Furthermore, the phrase “at least one of A, B, and C, etc.” is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B, and C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). In those instances where a convention analogous to “at least one of A, B, or C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B, or C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.).
Any patents, applications and other references, including any that may be listed in accompanying filing papers, are incorporated herein by reference. Aspects of the described technology can be modified, if necessary, to employ the systems, functions, and concepts of the various references described above to provide yet further embodiments. These and other changes can be made in light of the above Detailed Description. While the above description details certain embodiments and describes the best mode contemplated, no matter how detailed, various changes can be made. Implementation details may vary considerably, while still being encompassed by the technology disclosed herein. As noted above, particular terminology used when describing certain features or aspects of the technology should not be taken to imply that the terminology is being redefined herein to be restricted to any specific characteristics, features, or aspects of the technology with which that terminology is associated.
The present application claims the benefit of the earlier filing date of U.S. Provisional Patent Application No. 62/490,421, filed Apr. 26, 2017, which is incorporated herein by reference in its entirety.
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| Number | Date | Country | |
|---|---|---|---|
| 20180310950 A1 | Nov 2018 | US |
| Number | Date | Country | |
|---|---|---|---|
| 62490421 | Apr 2017 | US |
