1. Field of the Invention
The present invention relates to an incubation and/or storage container assembly for gametes and/or at least one embryo and in particular for such a container assembly adapted for use in intravaginal incubation and culture for humans or other mammals.
2. Description of Prior Art
Conventional in-vitro fertilization (IVF) techniques are notoriously complex. They involve aerobic and sterile culture of embryos in Petri dishes at 37° C. in a 5% CO2 enriched atmosphere which requires cumbersome and expensive equipment such as a CO2 incubator operating 24 hours a day during the two or three days required for the fertilization and culture. It also involves delicate manipulations requiring the skills and dexterity of a laboratory biologist.
Intravaginal culture (IVC) has been developed and comprises maturation of gametes, fertilization of oocytes and embryo development in a sealed container filled with a suitable culture medium which is then placed in the vaginal cavity which serves as an incubator. This technology is disclosed in Ranoux U.S. Pat. Nos. 4,902,286 and 5,135,865. It is designed and utilized by assisted procreation specialists in their offices or clinics.
To date, IVC procedures have been performed with a polypropylene Cryotube manufactured by Nunc of Kamptrup, Denmark, which is closed after loading the gametes and sealed in a polypropylene Cryoflex envelope also manufactured by Nunc. IVC procedures using such a container assembly have numerous drawbacks. Many of these drawbacks are overcome with the container assembly disclosed in Ranoux et al U.S. Pat. No. 6,050,935. That patent describes a IVC container assembly comprising a container body and resealable closure means for selectively opening and closing a container body orifice. The container body has a main chamber with a cylindrical sidewall and a microchamber in communication with each other which permits the movement of one or more embryo(s) into and out of the microchamber. The microchamber has sidewalls of optical quality permitting microscopic inspection of embryos. The microchamber also facilitates the retrieval of one or more embryo(s) by means of catheter without endangering the embryo(s). The container body is equipped with various valve designs which are either bulky or complex construction and/or uneasy to operate. A two-piece capsule of soft flexible material envelopes the container for lodgment in the posterior fornix.
When such a IVC container is taken out of the posterior fornix of the vagina, the outer capsule is removed and the embryos in the microchamber may be inspected under a microscope. One or more embryos is then retrieved from the microchamber by a catheter for transfer to the uterus. This is done while the patient is being prepared for the transfer of the embryo(s). The entire procedure is also designed to be carried out in an obstetrician or other assisted procreation specialist's office with a minimum of equipment.
One of the advantages of the IVC procedure is that fertilization and culture are carried out intravaginally where the atmosphere is naturally CO2 enriched and the amount of oxygen is much lower than of the ambient environment. Both properties are acknowledged as being beneficial, see Alan O. Trounson et al., Handbook of In-vitro Fertilization, CRC Press, Inc., 1993, p. 97 and Misao Fukuda et al., “Unexpected Low Oxygen Tension of Intravaginal Culture”, Human Reproduction, vol. 11, no. 6, pp. 1996, 1293-9. Likewise, the temperature is that of the natural environment of the vagina. Once the IVC container is removed from the vagina, it no longer benefits from this ideal natural environment. It is also known that the intravaginally CO2 enriched environment ensures the pH in the container is relatively constant and about 7.3 and that a lower level of CO2 in the container will cause a drop in the pH of the biological medium in which the embryo(s) reside. A relatively small change in the pH (say 0.5) may have drastic consequences over a long period of culture on the embryo(s).
An object of the present invention is to mitigate such drawbacks of known IVC containers and to provide an improved incubation and/or storage container assembly system and container system components and an improved method for incubation and/or storage of gametes and/or one or more embryos.
According to one aspect of the invention, a buffer chamber for CO2 enriched atmosphere is provided and cooperable with the vessel containing the biological medium gametes and/or one or more embryo(s) and is in communication with a CO2 permeable wall of the vessel. With such an arrangement, the vessel will remain in a CO2 enriched environment even after it is removed from the CO2 enriched incubation environment in particular a vagina. Thereafter, the CO2 enriched air in the buffer chamber will be able to enter the vessel and compensate for any fall in the CO2 level inside the vessel and thereby mediate the pH in the biological medium. Indeed, it has been found if such a buffer chamber is provided on the incubation or storage vessel, the pH level of the biological medium in the vessel will fall only slightly over the period of about one or two hours after the removal of the container assembly from the CO2 enriched environment. Such a small dip in the pH level does not have any significant effect on the embryo(s) in the biological medium.
According to another aspect of the invention, a buffer chamber is provided, comprising a shell mounted on the vessel with a CO2 permeable seal disposed between the vessel and the shell to prevent the ingress of liquids or other viscous fluids, in particular vaginal secretions while allowing the inflow of the CO2 enriched air from the surroundings and in the case of intravaginal incubation, from the vagina. In practice, the CO2 inflow rate of the permeable seal will be greater than the inflow rate of CO2 through the permeable wall of the vessel and very much greater than the CO2 outflow rate through the shell wall.
According to another aspect of the invention, the shell is mounted for movement on the vessel between open and closed positions. The shell will be in its open position when the container assembly is introduced into a CO2 enriched air environment, such as a vagina in the case of intravaginal use, and is closed as soon as the container assembly is removed from the CO2 enriched air environment. In such an embodiment, the CO2 enriched air outflow may be virtually nil during the period between the removal of the container assembly from the CO2 enriched environment and the retrieval of the embryos from the vessel for transfer to a recipient, thereby ensuring CO2 equilibration in the biological medium.
In the course of residence in the CO2 enriched intravaginal environment, the level of oxygen in the buffer chamber will reach the favorably depleted O2 level which prevails in the vagina. Thus, after the container assembly is removed, not only is the air inside the buffer chamber advantageously enriched in CO2 but also reduced in O2.
According to an embodiment of the invention, the vessel is provided with a closure device including overlying disc-shaped valve members, each with an orifice, mounted for relative angular movement between an open position for access to the interior of the vessel and a closed position for sealing off access to close the vessel.
According to an embodiment, the peripheral flange of the outer disc-shaped valve member has a peripheral sidewall radially beyond the peripheral flange of the inner disc-shaped valve member. One of the peripheral flanges has protrusions selectively cooperable with cutouts in the peripheral sidewall in the other peripheral flange when the valve is in its closed position. Preferably, the peripheral sidewall of the outer disc-shaped valve member has one or more hooking members for snap fitting axial retention of the outer disc-shaped valve member on the inner disc-shaped valve member and/or a peripheral flange of the vessel.
According to a preferred embodiment, sealing material is affixed to one of the disc-shaped valve members for fluidtight or rubbing contact with the other of the disc-shaped valve members. Where required, an additional sealing cap for impeding the ingress of vaginal fluids overlies the closure device and is in sealing engagement with the closure device and an upper portion of the outside wall of the shell.
One or both of a pair of opposed sidewalls of the microchamber has an abutment for docking a catheter at the desired location. A portion of the associated recess may define a lens face for viewing one or more embryo(s) in the catheter during or after retrieval from the microchamber.
The inner wall surface of the main chamber of the vessel tapers towards the microchamber. Thus, when the container assembly is received in the posterior fornix, that is in a substantially horizontal position, except when the recipient lies on her side, the inner wall surface slopes to a small zone, where gametes will tend to congregate, thereby enhancing the probability of contact between sperm and oocytes.
According to another aspect of the invention, there is provided a shell for surrounding the vessel and defining therebetween a buffer chamber for a CO2 enriched atmosphere. According to a preferred embodiment, there are at least two shell parts and a gas flow passage between respective ones of the shell parts. Preferably, there is a CO2 permeable seal located in the gas flow passage for allowing the inflow of CO2 enriched air and impeding the ingress of fluid, in particular vaginal fluids into the buffer chamber. Such a shell may enclose various kinds of IVC vessels and in particular IVC vessels with closure devices for selective access to the interior of the vessel. The shell is preferably made of a smooth, rigid transparent medical grade material and sized and configured for accommodation in the posterior fornix. With such a shell no separate container sleeve or carrier is necessary.
These and another objects and advantages of the invention will be brought out in the description of embodiments given by way of example with reference to the accompanying drawings.
The first embodiment of the container assembly 10 for incubating and/or storing gametes and/or one or more embryos is illustrated in
The terms such as “upper” and “lower” are used by convention in the specification and claims, in respect to all embodiments, to refer to relative positions in the container assembly as oriented for example in
The container assembly 10 comprises an inner vessel 20, also referred to as the vessel, the vessel having a closure device 30 for opening and closing access to the interior thereof. The inner vessel 20 is at least partly surrounded and preferably substantially entirely surrounded by a buffer chamber 60 comprising in the illustrated embodiment a shell 61 cooperating with the inner vessel 20.
The inner vessel 20 comprises an upper, main chamber 21 and a lower, microchamber 22 in communication with each other. The inner wall surface 23 of the main chamber tapers towards the generally parallelepipedic microchamber 22. As the upper end of the main chamber in this environment is circular and the lower end is substantially rectangular, the contour of the inner wall surface varies from a circle to a rectangle. The overall shape of the inner wall surface 23 is generally frustoconical with transverse sections that are somewhat flattened oval shapes. The portions of the inner wall surface 23 which lead into wider sidewalls 24 of the microchamber 22 are generally flatter than the portions of inner sidewall which lead into the narrower end walls 25 of the microchamber. At least one of the opposed walls, here sidewalls 24, are of sufficient optical quality to permit inspection under microscope or other magnification instrumentation. In practice, the microchamber 22 and in fact the entire vessel will be made of a medical grade material of good optical quality, such as polycarbonate. A polycarbonate which may be suitable is Makrolon RX.2530 45 1118 available from Bayer Chemicals. This polycarbonate has a CO2 permeability of the order of about 43.0 cm3×cm/m2×24 hr×atm. at standard temperature and pressure. Preferably, however, the vessel body is made of a crystal polystyrene, such as Nova High Heat Crystal Polystyrene, ref. 1204. Regardless of the constituent material, the vessel has a peripheral flange 26 extending radially outwardly from the upper end thereof.
The closure device 30 is provided at the open upper end of the vessel body and comprises in a preferred embodiment a valve 31 including two overlying disc-shaped valve members 32, 42. One of the valve members is fixed and the other is mounted for relative angular movement. In practice, the lower valve member 32 is fixed by ultrasonic welding to the upper end of the vessel in practice, the peripheral flange thereof. Each of the valve members comprises a central panel 34, 44 having a port or orifice 38, 48, adapted to be brought into registration in the fully open position of the closure device and out of communication in the fully closed position of the closure device. Each of these orifices 38, 48, is of the same D-shaped contour in the illustrated embodiment. Such a D-shaped contour may limit the access area to permit the entry of only the thinnest of catheters or the largest of pipettes. Obviously, other contours are possible, in particular circular, such as disclosed in the third embodiment. The contour edge of one of the orifices 38, 48 and preferably the orifice 38 in the lower valve member 32 has a raised lip or bead 39 for enhanced sealing engagement with the underside of the central panel 44 of the upper valve member. The upper surface of the central panel 44 of the lower valve member has another, second, raised lip or bead 40 spaced from the first raised lip or bead 39 and of C-shape as shown, which extends proximate to the outer periphery of the solid portion of central panel 34. The second raised lip or bead 40 ensures that the central panels 34, 44 of the valve members remain parallel to each other to avoid leaking.
Each of the central panels 34, 44 is respectively surrounded by an upwardly or outwardly flaring frustoconical sidewall 35, 45, from the upper end of which extends a radially outwardly extending peripheral flange 36, 46. The respective central panels 34, 44, flaring sidewalls 35, 45 and the peripheral flanges 36, 46 are respectively parallel to each other. One of the mutually contacting surfaces of the sidewalls has a grooved screwthread 47 and the other of the mutually contacting surfaces of the sidewalls has a slider 37 adapted to be received and guided in the grooved screwthread 47. The screwthread 47 and slider 37 have a dual function. One function is to guide angular movement of one disc relative to the other disc and the other function is to separate one disc relative to another disc to break contact between the protruding lip 39 and the central panel 44 of the facing valve member. Other guiding means may be provided instead of the screwthread groove and slider permitting both of these functions. Alternatively, the axial displacement function can be eliminated and a circular groove used in which case there is simply rubbing contact between the raised lips or beads 39, 40 and the facing central panel of the other valve member when the valve member is rotative. In fact, both of these functions may be eliminated, such as disclosed in the third embodiment described below and illustrated in
A peripheral flange 46 extends downwardly from the peripheral flange 46 of the upper valve member 42 and has a radially inwardly projecting hooking member 49 cooperable with the undersurface of at least one of the peripheral flanges of the vessel and fixed valve member and as shown under the undersurface of peripheral flange 26 of the vessel 20. The peripheral flange 46 and the adjoining peripheral sidewall 46A have a plurality of spaced cutouts 50, a first portion 50A of each cutout having radially inwardly flaring sides 50B being located in the peripheral flange and a second portion 50C extending downwardly along the peripheral sidewall 46A and defined by leading and lagging parallel edges 50D, 50E generally in alignment with the respective hooking members 49.
The outer peripheral edge 36A of the peripheral flange 36 of the lower valve member has one or more protrusions 36B defined by a generally radial edge and generally circumferential or tangent edge and two such protrusions 36B diametrically opposed and mirror images of each other, as shown. The protrusions are adapted to clickingly clear the respective leading edges of the second portions 50D of the cutouts 50 to provide an audible signal that the closed position of the closure member has been reached (see
The lower and upper disc-shaped valve members 32, 42, may be assembled in the following manner. The upper valve member 42 is positioned on top of the lower valve member 32 previously ultrasonically welded to the vessel, and pressed downwardly. The edge 36A of the peripheral flange 36 will ride along and clear the oblique undersurfaces 49A of the hooking members 49 and snap into the space 49C between the upper end surface of the hooking member 49 and the underside of peripheral sidewall 46A of the upper valve member 42. The outer diameter of the peripheral flange 36 of the lower valve member and the peripheral flange 26 of the vessel is slightly greater than the diametrical distance between the radially inner ends 49B of the hooking members 49 thereby preventing the escape of the outer valve member off of the peripheral flange of the vessel.
The lower valve member 32 may be made of the same polycarbonate or better polystyrene used for the vessel body or some other medical grade material compatible for ultrasonic welding with the peripheral flange of the vessel. The upper valve member is preferably made of a softer material than the material used for the lower valve member in order to enhance the sealing action of the contour lip or bead. For example, a polypropylene available from Huntsman Corp. under reference 13G9A is suitable. Such a polypropylene has a permeability of about 60 cm3×cm/m2×24 hr×atm. at standard temperature and pressure.
The outer surface of the vessel body has a radially outwardly opening annular groove 27 for accommodating a sealing member 28 which may be a O-ring, as illustrated in
The shell is made of a medical grade material having good clarity for inspection of the contents in the microchamber through the wall of the shell. To this end, it preferably has diametrically opposed planar zones of optical quality adapted to be in alignment with the sidewalls of the microchamber (this feature not being shown in the embodiment of
According to an embodiment, the CO2 permeability of the seal is selected to be, say, one or two orders of magnitude greater than the permeability of the vessel wall and at least two orders of magnitude greater than the CO2 permeability of the shell wall. An example of such an embodiment is a silicone seal having a CO2 permeability of the order of about 30,500 cm3×cm/m2×24 hr×atm. at standard temperature and pressure, a vessel made of Makrolon polycarbonate having a CO2 permeability of about 43.0 cm3×cm/m2×24 hr×atm. at standard temperature and pressure and a shell made of Eastar PETG having a permeability of about 83 cm3×cm/m2×24 hr×atm. at standard temperature and pressure. Preferably, however, the shell is made of medical grade polystyrene having a permeability of about 69 cm3×cm/m2×24 hr×atm. at standard temperature and pressure.
Preferably, the CO2 permeability of the constituent materials is selected so that the CO2 permeable seal is between about 10,000 and about 40,000 cm3×cm/m2×24 hr×atm. at standard temperature and pressure whereas the CO2 permeability of the vessel is between about 50 to about 500 cm3×cm/m2×24 hr×atm. and the CO2 permeability of the shell is between 0 (corresponding to glass) and 200 cm3×cm/m2×24 hr×atm.
The vessel and/or the seal material may be also chosen in order to slightly delay the entry of the CO2 enriched gas into the vessel to counter the initial generation of acidic metabolic products during which the CO2 in the vessel which should be allowed to permeate through the vessel wall into the buffer chamber maintaining the desired equilibration level, while thereafter allowing the CO2 enriched environment to flow into the vessel in order to maintain a pH of about 7.4 once acidic metabolic products cease to be produced.
When the container assembly is not intended for intravaginal use, there may be no need to prevent the ingress of liquids or other viscous fluids.
Sealing member configurations other than O-rings may be useful and in particular annular gaskets having a rectangular cross section and therefore the same gas flow rate through the entire radial extent of the cross section.
In practice, the sealing member will have an inner diameter in its rest configuration which is slightly less than the corresponding outer diameter of the complementary bight portion of the groove and an outer diameter which is slightly greater than the inner surface of the shell in contact to cause elastic deformation and thereby ensure a snug fit and satisfactory tightness.
The lower end 29 of the vessel 20 that is the trapezoidal shaped portion (as shown) of the vessel situated below the microchamber 22 will in practice be solid and not hollow. The lower end 29 of the vessel has a locating member 29A cooperable with a complementary locating member 63 of hollow cylindrical configuration and upstanding from the bottom 62 of the shell 61 in the illustrated embodiment. The locating member 29A has at least one protruding bead or boss 29B which is cooperable with a complementary groove or recess 64, so as to define a stable position of the vessel when the vessel is fully inserted into the buffer chamber. Alternatively, or in combination with the aforesaid locating members 29A, 63, the abutting surfaces of the top edge of the locating member 63 and the downwardly facing annular shoulder of the lower end 29 may define the fully inserted position of the vessel relative to the shell 61.
Guiding members (not illustrated in this embodiment) may be provided to guide the movement of the vessel to ensure the locating member 29A at the lower end 29 is correctly engaged into the complementary locating member 63. Such guiding members may for example comprise two or more fin-like elements integral with the outer wall of the vessel or the inner wall of the shell and cooperable with the other of the outer wall of the vessel or the inner wall of the shell. Such guiding members are described and illustrated below in connection with the fourth embodiment.
Such a container assembly as illustrated in
This assembly, however, is especially designed for use in intravaginal incubation. To this end, it will be preferably enveloped in a container sleeve or carrier 70 for facilitating intravaginal residence in the posterior fornix. The container sleeve 70 is made of a soft smooth elastic biocompatible material. In the illustrated embodiment, the sleeve 70 is of one-piece construction with an apertured sidewall 71 extending between opposed rounded ends 72, 73 suitable for cooperation with the vaginal vault. The lower rounded end 73 has on its outside surface a plurality of circumferentially spaced dimples 76 for facilitating the removal of the entire container assembly by means of forceps cooperating with dimples. The upper portion of the lower rounded end converges inwardly (in the rest condition) in order to enhance the elastic engagement with the bottom end of the shell 61. The sidewall 71 comprises in practice a plurality, here two, circumferentially spaced longitudinal straps 74 defining apertures 75 therebetween. At least one of the apertures 75 is suitable for the introduction of the container assembly into the internal space 76 of the container sleeve 70. In the embodiment illustrated, the upper rounded end 72 is larger than the lower rounded end 73 and comprises a plug portion 77 complementary in shape and adapted to be received in the recess defined by the sidewalls 45 and central panel 44 of the upper valve member 42. One or both of the straps 74 may have one or more radially inwardly protruding lip 79 cooperable with the outer edge of the lower valve member and/or peripheral flange 26 of the vessel. Similarly, the inner surface of the bottom rounded end 73 is generally complementary to the bottom wall of the shell 61. In the relaxed position of the container sleeve 70, that is before it is fitted on the container assembly 10, the distance between the inner face of the plug portion 77 of the upper rounded end and the inner or the lower face of the lower rounded end of the container sleeve is less than the distance between the outer surface of the bottom wall 62 of the shell and the outer surface of the central panel 44 of the upper valve member, so that an axial biasing force is exerted by the container sleeve 70 in order to urge the inner and outer valve members into contact and define a second tier sealing between the interior of the vessel and the surrounding environment. In practice, the total length of the entire container assembly with the container sleeve will be about 4-5 cm for a woman or about 5-15 cm for a cow. The container sleeve may be made of any medical grade thermoplastic elastomer, such as AES Santoprene 8281-35 W237 having a hardness of 35 Shore A and good cushioning properties. Santoprene has a CO2 permeability of about 30-300 cm3×cm/m2×24 hr×atm. at standard temperature and pressure.
After the container assembly 10 is closed with the sleeve fitted thereon, it may be introduced into the vaginal vault and positioned in the posterior fornix for about 48 to about 72 hours according to current procedure. Prior to introduction into the vaginal vault, the container assembly may undergo pre-incubation at 37° C. with or without the sleeve for less than about two hours, safely in a conventional incubator without a CO2 enriched environment. Alternatively, the whole incubation period may be carried out in an artificial CO2 enriched environment.
When the container assembly is lodged in the posterior fornix, the longitudinal axis of the vessel will be generally horizontal. As the inner wall surface slopes away from the microchamber and towards the closure device, gametes and in particular oocytes will tend to congregate in the vicinity of the zone where the undersurface of the central panel of the lower valve member meets the inner wall surface of the vessel, as illustrated in
After intravaginal residence, the container assembly is removed. For this purpose, a monofilament string (not shown) of biocompatible material may be attached, bonded to, or integrally formed with, one of the ends or the straps of the container sleeve.
The container assembly is then taken out of the container sleeve. The contents of the microchamber where the embryo(s) will settle by gravity (in the
Once the desired embryo(s) have been selected, an implantation catheter such as Frydman or Wallace catheter is introduced after slightly opening the closure device by turning the upper valve member. The catheter is then snaked through the main chamber to a location proximate the junction of the main chamber and the microchamber which is equipped with an abutment 22A in a wall of the microchamber, and in practice a pair of abutments in the opposed sidewalls for docking the end of the catheter at a sufficient height above the floor 22B of the microchamber to prevent the catheter from coming into direct contact and thereby possibly crushing or otherwise injuring the embryo(s) in the microchamber (see
The embryo(s) may then be implanted in accordance with current IVC practice.
Another embodiment is illustrated in
Features of the second embodiment corresponding to features of the first embodiment are identified by the same references augmented by “100” and will not again be described.
In the second embodiment, the upper or outer disc-shaped valve member terminates in the peripheral flange 146 which comprises opposed pairs of radial projections 147 alternating with and separated by concave zones. The radial projections 147 alternating and separated by and/or the concave zones facilitate the grasping of the upper disc-shaped valve member for facilitating turning between open and closed positions of the valve. As in the first embodiment, a slider on the upper or outer valve member 142 may ride along the screwthread groove in the lower valve member between a position in which the orifices 138, 148 are out of communication with each other and the solid portions of the central panels 134, 144 overlying each other and are in mating contact with the contour edges of the orifices. The materials employed in the second embodiment re preferably the same as noted above in connection with the embodiment of
Instead of a single position of the vessel relative to the shell disclosed in the first embodiment, the vessel 120 and the shell 161 have two stable positions, namely an open position or condition for use when the container assembly is placed in a CO2 enriched environment for incubating the contents and a closed position or condition for sealing the buffer chamber and preventing the escape of the CO2 enriched and O2 depleted contents or the entry of ambient air from the surroundings after the container assembly has been removed from the incubating environment.
The first position or condition is illustrated in
In the lower position, a closure seal 180 is defined by the annular notch 169 at the upper end of the shell 161 which is cooperable with a peripheral portion 181 of the undersurface of the peripheral flange 126 of the vessel and the free edge 182 of the peripheral flange of the vessel and possibly the free edge of the peripheral flange of the lower valve member 132. The closure seal 180 is essentially defined by the contact between the notch and the portions of the peripheral flange of the vessel. In accordance with a variant, not illustrated, an additional sealing member or gasket may be provided either at the upper end of the shell or at the peripheral flange of the vessel and/or lower valve member. Such an additional sealing member or gasket will be of very low gas permeability to prevent the escape of the atmosphere contained in the buffer chamber or the entry of the ambient atmosphere into the buffer chamber. Such an embodiment is therefore suitable for prolonged storage of many hours, or even days or transit or shipment.
For such a purpose, the container assembly may be loaded into a pre-heated isothermal holding block for maintaining the contents of the vessel substantially constant at about 37° C. An embodiment of such a holding block 100 is illustrated in
Before the holding block is to be used, it is heated to the desired temperature of about 37° C. When the connecting assembly is fully inserted in the lateral bore, the microchamber and the corresponding surface 65 of optical quality on the shell 61 will be aligned with the vertical bore 102 for viewing the embryo(s) or other contents of the microchamber with a microscope. The part of the container assembly and in particular the microchamber located at the intersection of the lateral and vertical bores is lit from below through a light shaft defined by the lower portion of the vertical bore 102.
Alternatively, the container assembly without the shell may be introduced into the lateral bore for viewing the contents of the microchamber in which case there is no need for the surface(s) 65 of optical quality. According to another embodiment (not shown), the block is equipped with a heating element for maintaining the temperature of the block substantially constant at about 37° C. and may be of particular interest for use when the container is to be shipped or transported to another location for inspection of the embryo(s). The top surface of the block also has one or more vertical aligned bores 103 for receiving in a substantial vertical position one or more container assemblies prior to inspection or smaller tubes for containing sperm or oocytes.
Another, third embodiment is illustrated in
In the third embodiment, the sealing tightness of the closure device is improved over that of the first embodiment. The third embodiment also includes an optional sealing cap for better impeding the ingress of vaginal fluids in the course of vaginal residence.
The modified closure device 230 comprises a valve 231 including two overlying disc-shaped valve members 232, 242. One of the disc-shaped valve members is mounted for relative angular movement. As in the
The third embodiment also includes an additional sealing cap 280 which has a central panel 281 which overlies the upper disc-shaped valve member, here rotatable disc-shaped valve member 242, and more particularly the upper layer or liner 240 thereon, for sealing engagement thereof. Central panel 281 is recessed with an adjoining generally cylindrical sidewall 282, adjoining an upper annular flange 283 which overlies and is in sealing engagement with the corresponding annular flange of the upper disc-shaped valve member 242 and has a peripheral sidewall 284 which extends downwardly overlying the peripheral sidewall 246A of the upper disc-shaped valve member and in sealing contact therewith. The sidewall 284 of the sealing cap then extends obliquely (zone 285), that is downwardly and radially inwardly towards the shell 261 where the cylindrical lower part 285 of the sidewall 284 of the sealing cap comes into sealing engagement with the outer surface of the sidewall of the shell 261. In practice, the sealing cap is made of a soft and pliable sealing material, such as medical grade silicone; After the closure device has been brought to its closed position, the sealing cap 280 can be pushed or pulled down over the closure device 230 and the outer surface of the upper part of the shell sidewall. The elasticity and slightly smaller dimensions of the souple sealing cap compared with the corresponding dimensions of the closure device and shell sidewall ensure fluidtightness once the sealing cap is in place on the closure device and on the upper part of the shell sidewall.
The container sleeve 270 is fitted over the sealing cap and the shell before introduction into the vagina, substantially as described above, in connection with
As illustrated in
The fourth embodiment illustrated in
The novel shell 361 of fourth embodiment comprises at least two shell parts 363, 364. A gas flow passage 362 is defined between an outer upper wall of the lower shell part 364 and an inner lower wall of the upper shell part 363, the inner lower wall of upper shell part 363 having a diameter slightly greater than the diameter of the outer upper wall of the lower shell 364. As illustrated, this gas flow passage is annular. It is understood that other forms may be adopted including a plurality of distinct longitudinal grooves. The gas flow passage 362 has a so-called downstream end in communication with the buffer chamber 360 which, in this embodiment, virtually surrounds the entire vessel including its closure device, unlike the
The shell parts have coupling means 370 comprising a groove 370A in the inner wall surface of the upper shell part 363 including a longitudinal portion 371 extending from the free edge 367 of the upper shell part to a circumferential portion 372 extending in the counterclockwise as illustrated. Short of the endwall 375 of the circumferential portion of the groove 370A is a longitudinally extending bump 374. In practice, there are at least two, and preferably three, such grooves. The circumferential portion defines a central angle of about 30°. A corresponding number of radial projections 377 are provided proximate to the free upper edge of the lower shell part 364 (see
In the illustrated embodiment, the CO2 permeable seal is located at the interface between the upper and lower shell parts. According to an alternative embodiment which is not illustrated, the upper and/or lower shell parts may be provided with one or more CO2 permeable members located for example along part of the circumference of the necked or smaller diameter cylindrical portion of the lower shell member or in the central area of the domed portion of the upper shell member. These portions will be in sealing engagement with the surrounding portions of the lower or upper shell members but allow CO2 to permeate into the buffer chamber when the shell is in communication with a CO2 enriched atmosphere. Similarly, the upper or lower shell parts may have rigid transparent or non-transparent zones of plastic materials having different CO2 permeabilities. In this case, the portion or portions of the lower CO2 permeable material may be overmolded around the round portions of higher CO2 permeability.
After the vessel is loaded with a biological medium, ovocytes and sperm, and/or one or more embryos when used for storage purposes, the closure device is brought to the fully closed position, thus sealing the vessel. The lower end of the vessel has a locating member 229 which is adapted to be received in a locating socket 380 on the bottom wall of the lower shell part 364. In this embodiment, the locating member 229 is received with clearance in the locating socket 380. If the clearance is sufficiently ample, the locating socket 380 does not ensure an stable upright position of the vessel on their own. In this case, the coaxial position of the vessel relative to the lower shell part 364 is ensured by guiding means on the vessel or a part appurtenant thereto and inner wall of the lower shell part. To this end in the illustrated embodiment the longitudinally extending guiding members 381 are provided on the inside wall of the lower part of the shell which are cooperable with a ring, and in particular an O-ring 338 as illustrated, received in an outwardly opening groove 227 on the side wall of the vessel. It will be understood that the function of O-ring 338 is not the same of that of the O-ring 238. Indeed, the O-ring 338 needs not to have a particular permeability or be able to impede the ingress of vaginal fluids, for example. The outer diameter of the ring is preferably slightly greater than the diameter defined by the guiding members 381 at the same location thereby ensuring in cooperation with the complementary locating member and locating socket a stable coaxial position. Thanks the resilience of the O-ring and the loose fit of the complementary locating members; some movement of the vessel relative to the shell is possible. Alternatively, a more rigid coaxial positioning of the vessel relative to the shell is possible in which case the O-ring may be either of less resilient material or replaced by a openable rigid ring or even a fixed or integrally molded with the vessel itself. The guiding members 381 are circumferentially spaced from each other and are preferably L-shaped in cross section for receiving a label (not shown) for identifying the person to whom the oocytes or embryo(s) belong.
For assembling the shell parts 363, 364 they are moved towards each other initially longitudinally, guided by the cooperation of the radial projections 377 and the longitudinal portions 371 of the grooves 370A. Additional longitudinal force is exerted to compress the CO2 seal gasket slightly whereupon the radial projections 377 may enter the respective circumferential portions, and the shell parts may then be turned relative to one another until the radial projections 372 move beyond the bumps 374 in the circumferential portions. The circumferential outer surface of the radial projections 377 ride onto the bumps 374, as the radial projections reach the endwalls 375 of the circumferential portions 372 of the groove 370A, thus tightening the engagement between the shell parts and thereby resisting inadvertent relative angular movement once the shell is closed, and also in the course of vaginal residence.
Each of the shell parts 363, 364, is made of molded rigid, transparent medical grade biocompatible material such as a crystal polystyrene and in particular Nova High Heat Crystal Polystyrene, ref. 1204, available from Nova Chemicals, Moon Township, Pennsylvania though polycarbonate may also be suitable. The polystyrene will have a highly smooth or “polished”, surface finish which has been found to be highly suitable for the about 48-72 hours contact with vaginal tissue of the posterior fornix with a reduced risk of irritation than with the Santoprene container sleeve or carrier of the type illustrated in
The sidewall of the lower shell part 364 has a substantially cylindrical wall portion between upwardly and downwardly flaring portions. The cylindrical wall portion of reduced diameter facilitates the manual or mechanical gripping of the shell, for example, with a tenaculum. The total length of the shell is preferably 40-50 mm and the transverse dimension of the cylindrical wall of smaller diameter is preferably 20-25 mm in the case of a shell intended for a woman's vagina.
The sidewall of the lower shell part 364 may be provided with a portion or portions of optical quality (not shown) permitting the viewing of embryos settled in the microchamber of the vessel.
According to a non-illustrated feature, once the container assembly is removed from the vagina, the CO2 permeable seal is inhibited or overridden, for example by positioning or placing over the CO2 permeable seal, a complementary sealing ring of low CO2 permeability, e.g. of low permeability nylon, over the CO2 permeable seal, or simply at the upstream end of the gas flow passage between the upper and lower shell parts, so as to seal off or substantially seal off the gas flow passage connecting the buffer chamber to the surroundings, and thereby reduce or eliminate the loss of the CO2 enriched air and/or O2 depleted atmosphere from the buffer chamber. With such a sealing ring in place, the shell can be used for storage or transit of the embryo(s) prior to retrieval and transfer. Alternatively, other kinds of seal may be provided at the gas flow passage, for example a high seal CO2 permeable tape with a suitable adhesive affixing it to the outer surface of the upper and lower shell parts. In the latter case, the annular shoulder 366 of the lower shell part may be followed by a cylindrical portion substantially of the same diameter as the outer surface of the lower portion or skirt of the upper shell part. Similarly, an adhesive tape can carry on its adhesive face a low CO2 permeability sealing ring adapted to close off or substantially close off the gas flow passage.
In any event after incubation the vessel with or without the shell may be transferred to an isothermal insulating block illustrated in
It would be appreciated that these and other modifications and variants may be adopted without departing from the spirit and scope of the invention defined by the appended claims.
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/US04/03656 | 2/10/2004 | WO | 5/16/2006 |
Number | Date | Country | |
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Parent | 10360630 | Feb 2003 | US |
Child | 10544990 | May 2006 | US |