This disclosure relates to the manufacturing of dip-molded articles. For example, this disclosure relates to the manufacturing of inflatable dip-molded implantable medical devices.
Dip molding is performed by submerging a mold that will form the inside of the resulting article into a liquid polymer. A layer of the polymer coats the mold to form the article. After the polymer is sufficiently cured, the polymer article is separated from the mold.
The configurations of some dip-molded articles preclude the use of a rigid mold because the molded polymer article cannot be stripped from the rigid mold without damaging the article. For example, some balloon-like inflatable medical devices have a small orifice in comparison to the size of its internal space that is created by the mold. Hence, removing a rigid mold from the internal space through the small orifice may be difficult or impossible without tearing the molded polymer article.
This disclosure describes processes for manufacturing dip-molded articles such as, but not limited to, dip-molded inflatable implantable medical devices used for the repair and treatment of tissues in bodily joints. More particularly, this disclosure describes apparatuses and methods for processing dip-molded inflatable implantable medical devices to remove substances that are used during dip molding process.
In one aspect, this document is directed to a dip-molded article processing machine. Such a dip-molded article processing machine can include a first conveyor assembly defining a first conveyor surface, a first compression section comprising one or more rollers with an outer peripheral surface spaced apart from the first conveyor surface by a first gap distance, and a second compression section comprising a second conveyor assembly defining a second conveyor surface. The second conveyor surface faces the first conveyor surface and is spaced apart from the first conveyor surface by a second gap distance.
Such a dip-molded article processing machine may optionally include one or more of the following features. The first conveyor surface and the second conveyor surface may be generally planar, non-parallel surfaces. The second gap distance may decrease along the longitudinal length of the second conveyor surface. The second gap distance may monotonically decrease along the longitudinal length of the second conveyor surface. The first gap distance may be greater than a minimum gap distance of the second gap distance. The machine may also include an electric motor that, when actuated, concurrently drives the first conveyor assembly, the one or more rollers, and the second conveyor assembly. The machine may also include a manual crank mechanism that, when rotated, concurrently drives the first conveyor assembly, the one or more rollers, and the second conveyor assembly. The machine may also include a power source configured to concurrently drive the first conveyor assembly, the one or more rollers, and the second conveyor assembly at a substantially equal linear speed. The first conveyor surface may be longer than the second conveyor surface. At least one of the first gap distance and the second gap distance may be adjustable. The second gap distance may differ along a longitudinal length of the second conveyor surface. The machine may also include one or more additional conveyor surfaces facing the first conveyor surface. The first conveyor surface may be longer than a combined length of the second conveyor surface and the one or more additional conveyor surfaces.
In another aspect, this disclosure is directed to a method for expelling contents from within a volumetric bladder. The method includes positioning the volumetric bladder on a first conveyor surface of a first conveyor assembly (wherein a contiguous gel material is contained within the volumetric bladder), and advancing the volumetric bladder along the first conveyor assembly such that the volumetric bladder receives compression between the first conveyor surface and a second conveyor surface of a second conveyor assembly. The compression expels at least some of the material out of the volumetric bladder.
Such a method for expelling contents from within a volumetric bladder may optionally include one or more of the following features. The compression may progressively increase as the volumetric bladder undergoes the advancing. The advancing may include the first conveyor surface, the second conveyor surface, and the inflatable medical device all moving at a same speed. The first conveyor surface and the second conveyor surface may be driven by rotation of a manual crank mechanism by a human operator or by an electric motor. During the advancing, a first compression applied to the volumetric bladder may convert the contiguous gel material to multiple smaller portions of gel material and a second compression applied to the volumetric bladder may expel at least some of the multiple smaller portions of the gel material out of the volumetric bladder. The first conveyor surface may be defined by a first conveyor belt and the second conveyor surface may be defined by a second conveyor belt. The volumetric bladder may be a biodegradable orthopedic spacer implant. The material may include semi-solid agar gel material. The first conveyor surface may be longer than the second conveyor surface. The volumetric bladder may receive additional compression between the first conveyor surface and a third conveyor surface of a third conveyor assembly. The additional compression may expel at least some additional amount of the material out of the volumetric bladder. The first conveyor surface and/or the second conveyor surface may be generally planar surfaces, and may be non-parallel to each other. The positioning may include orienting the volumetric bladder on the first conveyor surface such that an opening of the volumetric bladder is located at a trailing end of the volumetric bladder as the volumetric bladder undergoes the advancing. The volumetric bladder may be contained within a bag during the advancing, and the material expelled by the compression may be contained within the bag. The volumetric bladder may be a dip-molded inflatable medical device. The volumetric bladder may be a non-degradable orthopedic spacer implant.
Particular embodiments of the subject matter described in this document can be implemented to realize one or more of the following advantages. First, in some embodiments the apparatuses and methods described herein are used to remove molding material from within a dip-molded article while advantageously avoiding damage to the article. Second, the apparatuses and methods described herein can remove molding material from within a dip-molded article in an automated and, therefore, cost-effective manner. Third, the apparatuses and methods described herein remove molding material from within a dip-molded article in a clean manner that avoids contamination of the article, the machine, and the surrounding environment. Fourth, the apparatuses and methods described herein are designed to be adjustable, maintainable, and safe to operate.
Unless otherwise defined, all technical or/and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the invention pertains. Although methods and materials similar or equivalent to those described herein can be used in the practice or testing of embodiments of the invention, exemplary methods or/and materials are described below. In case of conflict, the patent specification, including definitions, will control. In addition, the materials, methods, and examples are illustrative only and are not intended to be necessarily limiting.
Some embodiments of the invention are herein described, by way of example only, with reference to the accompanying drawings. With specific reference now to the drawings in detail, it is stressed that the particulars shown are by way of example and for purposes of illustrative discussion of embodiments of the invention. In this regard, the description taken with the drawings makes apparent to those skilled in the art how embodiments of the invention may be practiced.
In the drawings:
Like reference numbers represent corresponding parts throughout.
Some devices, such as, but not limited to, inflatable implantable medical devices, are manufactured using a dip molding process. While the disclosure provided herein is described in the context of inflatable implantable medical devices, many other types of articles other than inflatable implantable medical devices are also manufactured using dip molded processes, and are just as relevant to the subject matter described herein. Dip molding is performed by submerging a mold that will form the inside of the resulting article into a liquid material. A layer of the material coats the mold to form the article. After the material is sufficiently cured, the dip-molded article is separated from the mold.
The configurations of some dip-molded articles preclude the use of a rigid mold because the molded article cannot be stripped from the rigid mold without damaging the article. For example, some balloon-like inflatable medical devices have a small orifice in comparison to the size of its internal space that is created by the mold. Hence, removing a rigid mold from the internal space through the small orifice may be difficult or impossible without tearing the molded polymer article. In some cases, therefore, the mold is made at least partially from a material that can be converted or broken down into a flowable state or condition (as used herein, “flowable state” or “flowable condition” refers to a semi-solid material that is capable of being extracted through an orifice). While the molding material is in the flowable condition, the molding material can be gradually expelled out of the small orifice without damaging the molded polymer article.
Referring to
In the depicted example, the mold 120 includes a holder 122 and a mold member 124. The mold member 124 is removably attached to the holder 122. In this illustrative example, the mold member 124 is shaped as a disk and the holder 122 is an elongate shaft. It should be understood that the size and shape of the mold member 124 are selected in accordance with the desired attributes of the final dip-molded article that is to be made using the mold member 124. Hence, while the mold member 124 is a disk in this example, it should be understood that the concepts described herein are by no means limited to disk-shaped articles.
While in some cases rigid molds are used for dip molding processes, the mold member 124 of dip molding process 100 is made of a material that can later be converted into a flowable condition to facilitate its removal from within the dip-molded article. For example, in some cases the mold member 124 can be made of agar material which is a contiguous semi-solid gel-like substance at room temperature. In addition to agar, other materials such as, but not limited to, polysaccharides (e.g., alginates, carrageenan, pectin, chitosan, and agarose) and polymers such as hyaluronic acid albumin and gelatin may be used to make the mold member 124 in some cases.
The holder 122 is used to manipulate the mold member 124. For example, the holder 122 can be used as a handle for dipping the mold member 124 into the polymer source 110.
After removing the mold 120 from the polymer source 110, the coating on the mold 120 is given a chance to cure. Then the holder 122 is separated from the mold member 124.
Referring also to
The next step of the process represented in
Referring also to
With the assembly 130 located within the flexible container 150, compression is applied to the assembly 130 (as described further below) to expel the material of the mold member 124 from within the dip-molded article 140. The material of the mold member 124 will be expelled through the orifice 142, without damaging the dip-molded article 140. Hence, the compression process converts the semi-solid gel-like mold member 124 to a flowable/extractable state to facilitate its removal from the dip-molded article 140 via the orifice 142.
Referring also to
Referring to
Referring also to the longitudinal cross-sectional view of the machine 200 shown in
For the sake of brevity and clarity, hereafter: (i) the materials and arrangement of
The first conveyor assembly 210 conveys the WIP material through the machine 200. In some embodiments, an electric motor is used as the power source for the conveyance. In some embodiments, manual exertion by a human operator is used as the power source for the conveyance. In some embodiments, a backing plate below the first conveyor belt surface 212 may be included to provide a stable foundation of support for the WIP material as it receives compression by the machine 200.
In some embodiments, the speed at which the first conveyor assembly 210 conveys the WIP material through the machine 200 results in a cycle time (i.e., the time to convert the pre-processed arrangement to the post-processed arrangement) ranging from about one minutes to about five minutes, or about 10 seconds to about three minutes, or about two minutes to about ten minutes, or any amount of time within those ranges, or any time more than ten minutes. In some embodiments, the speed is adjustable. In some embodiments, the speed is non-adjustable. In some embodiments, the speed may automatically vary depending on the location of the WIP material within the machine 200. In some cases, the speed is selected to be slow enough to substantially prevent incurring damage to the molded dip-molded article as the material of the mold member is expelled from the article.
In the depicted non-limiting example, the machine 200 includes a first compression section 220 and a second compression section 240. The first compression section 220 is nearer to the input end 202 than is the second compression section 240. Conversely, the second compression section 240 is nearer to the output end 204 than is the first compression section 220. Accordingly, as the WIP material advances through the machine 200 from the input end 202 to the output end 204, the WIP material first encounters the first compression section 220 and then subsequently encounters the second compression section 240.
The first compression section 220 converts the semi-solid gel-like material of the mold member in the pre-processed arrangement (e.g., mold member 124 of
In the depicted embodiment, the first compression section 220 includes a first compression roller 222a, a second compression roller 222b, and a third compression roller 222c. While the first compression section 220 of the depicted embodiment includes three compression rollers 222a, 222b, and 222c, in some embodiments one, two, four, five, six, seven, eight, nine, ten, or more than ten compression rollers are included.
In some embodiments, the compression rollers 222a, 222b, and 222c are driven rollers. That is, in some embodiments the compression rollers 222a, 222b, and 222c are rotationally driven by a motor or manual power. In some embodiments, the compression rollers 222a, 222b, and 222c are driven at a rotational speed that results in a surface speed on the periphery of the compression rollers 222a, 222b, and 222c that is substantially equal to the surface speed of the first conveyor belt 212. In some embodiments, the compression rollers 222a, 222b, and 222c are driven at a rotational speed that results in a surface speed on the periphery of the compression rollers 222a, 222b, and 222c that is less than or greater than the surface speed of the first conveyor surface 212. In some embodiments, the compression rollers 222a, 222b, and 222c are driven at a rotational speed that is variable and/or adjustable in relation to (or not in relation to) the surface speed of the first conveyor surface 212. In some embodiments, the compression rollers 222a, 222b, and 222c are not driven, but rather are idler rollers that may or may not turn in response to the WIP material being advanced by the first conveyor assembly 210.
In the depicted embodiment, the compression rollers 222a, 222b, and 222c are generally cylindrical with generally smooth outer surfaces. In some embodiments, one or more of the compression rollers 222a, 222b, and 222c may have shapes other than cylindrical and/or may have outer surfaces that are not smooth. For example, in some embodiments one or more of the compression rollers 222a, 222b, and 222c may have a polygonal, oval, or other regular or irregular cross-sectional shapes. In some embodiments, the outer surface of one or more of the compression rollers 222a, 222b, and 222c may include asperities, projections, texturing, knurling, and the like.
In some embodiments, the gap spaces between the compression rollers 222a, 222b, and 222c and the first conveyor surface 212 are all substantially equal to each other. In some embodiments, the gap space between one or more of the compression rollers 222a, 222b, and 222c and the first conveyor surface 212 may differ from the gap space between one or more of the other compression rollers 222a, 222b, and 222c and the first conveyor surface 212. For example, in some embodiments the gap spaces between the compression rollers 222a, 222b, and 222c and the first conveyor surface 212 may be progressively smaller as the WIP material is advanced (i.e., the gap space of the compression roller 222a being the largest, the gap space of the compression roller 222c being the smallest, and the gap space of the compression roller 222b being between the gap spaces of the compression rollers 222a and 222c). In some embodiments, the gap spaces of one or more (or all) of the compression rollers 222a, 222b, and 222c are adjustable (either individually or jointly). Any and all such aforementioned variations, and logical extrapolations thereof, pertaining to the first compression section 220 are envisioned, and are within the scope of this disclosure.
In some embodiments, the gap space between one or more (or all) of the compression rollers 222a, 222b, and 222c and the first conveyor surface 212 may be in a range, without limitation, from about 4 mm to about 6 mm, or about 3 mm to about 7 mm, or about 2 mm to about 8 mm, or about 4 mm to about 12 mm, or about 4 mm to about 10 mm, or about 4 mm to about 8 mm, or about 1 mm to about 6 mm.
In some embodiments, the machine 200 may include a warming device (e.g., infrared, ultrasonic, radiofrequency, microwave, radiator with water tank, etc.) that raises the temperature of the WIP material to make the material of the mold member less viscous (i.e., more flowable/extractable).
Still referring to
The second compression section 240 applies a progressively increasing amount of compression to the WIP material as the WIP material is advanced along the second compression section 240. Accordingly, the material of the mold member within the dip-molded article is gradually expelled from the article as the WIP material advances along the second compression section 240.
In some embodiments, the gap spacing between the second conveyor surface 242 and the first conveyor surface 212 differs or is inconsistent along the length of the second conveyor surface 242. For example, in some embodiments the gap spacing between the second conveyor surface 242 and the first conveyor surface 212 decreases along the length of the second conveyor surface 242 (in the direction from the input end 202 toward the output end 204). In some embodiments, the gap spacing between the second conveyor surface 242 and the first conveyor surface 212 decreases monotonically along the length of the second conveyor surface 242. In some embodiments, the gap spacing between the second conveyor surface 242 and the first conveyor surface 212 decreases linearly along the length of the second conveyor surface 242. In some embodiments, the gap spacing between the second conveyor surface 242 and the first conveyor surface 212 decreases non-linearly along the length of the second conveyor surface 242. In some embodiments, the gap spacing between the second conveyor surface 242 and the first conveyor surface 212 is adjustable.
In some embodiments, the gap spacing between the second conveyor surface 242 and the first conveyor surface 212 is in a range of about 5 mm to about 6 mm at the widest spacing (e.g., at the initial interface between the surfaces 242 and 212) and lessens to a range of about 0.8 mm to about 1.0 mm at the narrowest spacing (e.g., near the output end 204). In such a case, the gap spacing in the middle of the second compression section 240 may be in a range of about 2 mm to about 3 mm. It should be understood that such gap spacing dimensional parameters are merely exemplary and all dimensions of gap spacing and variations thereof are envisioned and within the scope of this disclosure.
Referring also to
Referring also to
In some embodiments, a receptacle 280 is included near the output end 204. Such a receptacle 280 can be used to catch materials such as the material of the mold member in some cases. In some embodiments, the receptacle 280 is configured as a sink and can collect water used for cleaning the machine 200. In some embodiments, also near the output end 204 is a tray 290 that can receive post-processed arrangement materials.
In some embodiments, one or more stationary brushes, portable brushes, and/or a combination thereof can be included that clean the conveyor surfaces 212 and/or 242 as the conveyor surfaces 212 and/or 242 pass by the brushes. In certain embodiments, cloths, abrasive pads, and/or other types of cleaning means can be included that clean the conveyor surfaces 212 and/or 242 as the conveyor surfaces 212 and/or 242 pass by.
In some embodiments, mechanisms are included for adjusting the tram of the conveyor rollers and/or adjusting the tension of the conveyor belts. For example, the first conveyor assembly 210 can include adjustment mechanisms 214a and 214b. Additionally, the second conveyor assembly 241 can include adjustment mechanisms 244a and 244b. Any additional conveyers may include additional adjustment mechanisms. Such adjustment mechanisms 214a-b and 244a-b can be manipulated to fine tune the positioning and orientation of the end conveyor rollers of the first conveyor assembly 210 and the second conveyor assembly 241 respectively.
In some embodiments, a third compression section is included. For example, in some embodiments a pressure plate is rammed against the mostly empty dip-molded article after processing the article through the second compression section 240. Such a third compression can expel a little more material of the mold member out of the dip-molded article. In some embodiments, the third compression section may be operated manually. In some embodiments, the third compression section may be operated automatically or by a motor.
In some embodiments, a hood (not shown) can be used to at least partially enclose the machine 200. The hood can enhance safe operations of the machine 200. In some embodiments, the hood is movable (e.g., pivotable) away from the machine 200 and a safety interlock switch is included to detect whether the hood is properly positioned. Hence, when the hood is moved away from the machine 200, the machine 200 is prevented from operating in some embodiments.
While the inventive concepts provided herein are described in the context of the manufacturing process of an inflatable medical implant, it should be understood that the inventive concepts are by no means limited to such a context. In fact, the inventive concepts can be applied for the manufacturing processes of many other dip-molded medical devices and for the manufacturing processes of non-medical devices that are dip-molded or manufactured in a method containing a mold and an external article, which may not be by dipping.
Throughout this disclosure, a numerical value of a parameter, feature, characteristic, object, or dimension, may be stated or described in terms of a numerical range format. Such a numerical range format, as used herein, illustrates implementation of some exemplary embodiments of the invention, and does not inflexibly limit the scope of the exemplary embodiments of the invention. Accordingly, a stated or described numerical range also refers to, and encompasses, all possible sub-ranges and individual numerical values (where a numerical value may be expressed as a whole, integral, or fractional number) within that stated or described numerical range. For example, a stated or described numerical range ‘from 1 to 6’ also refers to, and encompasses, all possible sub-ranges, such as ‘from 1 to 3’, ‘from 1 to 4’, ‘from 1 to 5’, ‘from 2 to 4’, ‘from 2 to 6’, ‘from 3 to 6’, etc., and individual numerical values, such as ‘1’, ‘1.3’, ‘2’, ‘2.8’, ‘3’, ‘3.5’, ‘4’, ‘4.6’, ‘5’, ‘5.2’, and ‘6’, within the stated or described numerical range of ‘from 1 to 6’. This applies regardless of the numerical breadth, extent, or size, of the stated or described numerical range.
Moreover, for stating or describing a numerical range, the phrase ‘in a range of between about a first numerical value and about a second numerical value’, is considered equivalent to, and meaning the same as, the phrase ‘in a range of from about a first numerical value to about a second numerical value’, and, thus, the two equivalently meaning phrases may be used interchangeably.
The term ‘about’, as used herein, refers to ±10% of the stated numerical value.
It is to be fully understood that certain aspects, characteristics, and features, of the invention, which are, for clarity, illustratively described and presented in the context or format of a plurality of separate embodiments, may also be illustratively described and presented in any suitable combination or sub-combination in the context or format of a single embodiment. Conversely, various aspects, characteristics, and features, of the invention which are illustratively described and presented in combination or sub-combination in the context or format of a single embodiment, may also be illustratively described and presented in the context or format of a plurality of separate embodiments.
Although the invention has been described in conjunction with specific embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. Accordingly, it is intended to embrace all such alternatives, modifications and variations that fall within the spirit and broad scope of the appended claims.
While this specification contains many specific implementation details, these should not be construed as limitations on the scope of any invention or of what may be claimed, but rather as descriptions of features that may be specific to particular embodiments of particular inventions. Certain features that are described in this specification in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable subcombination. Moreover, although features may be described herein as acting in certain combinations and even initially claimed as such, one or more features from a claimed combination can in some cases be excised from the combination, and the claimed combination may be directed to a subcombination or variation of a subcombination.
Similarly, while operations are depicted in the drawings in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. In certain circumstances, multitasking and parallel processing may be advantageous. Moreover, the separation of various system modules and components in the embodiments described herein should not be understood as requiring such separation in all embodiments, and it should be understood that the described program components and systems can generally be integrated together in a single product or packaged into multiple products.
Particular embodiments of the subject matter have been described. Other embodiments are within the scope of the following claims. For example, the actions recited in the claims can be performed in a different order and still achieve desirable results. As one example, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results.
The present application is a national phase entry under 35 U.S.C. § 371 of International Application No. PCT/IB2017/056776 filed Oct. 31, 2017, published in English as WO 2018/138561 A1, which claims priority from U.S. Provisional Application Ser. No. 62/451,960, filed Jan. 30, 2017, all of which are incorporated herein by reference.
Filing Document | Filing Date | Country | Kind |
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PCT/IB2017/056776 | 10/31/2017 | WO | 00 |
Publishing Document | Publishing Date | Country | Kind |
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WO2018/138561 | 8/2/2018 | WO | A |
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