CA1119754A - Magnetic closure for an artificial intestinal outlet - Google Patents
Magnetic closure for an artificial intestinal outletInfo
- Publication number
- CA1119754A CA1119754A CA000324545A CA324545A CA1119754A CA 1119754 A CA1119754 A CA 1119754A CA 000324545 A CA000324545 A CA 000324545A CA 324545 A CA324545 A CA 324545A CA 1119754 A CA1119754 A CA 1119754A
- Authority
- CA
- Canada
- Prior art keywords
- sheath
- outlet
- stopper
- magnetic closure
- magnet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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- Prostheses (AREA)
- Materials For Medical Uses (AREA)
Abstract
A magnetic closure for artificial intestinal outlets comprising a ring magnet implanted around the intestinal outlet; a stopper, therefore is formed from another cylindrical bar magnet removably inserted in a sheath of chemically softened open-cell polyvinyl acetal foam. The sheath is preferably waterproofed on its inner surface by means of a silicone compound. The sheath is approximately a circular cylinder; however, its ends may be thickened to give it an "hour glass" shape. A withdrawal string is provided for removal of the stopper,
Description
`` ~1197S4 ~: "
The invention relates to a magnetic closure for an artificial intestinal outlet, having a ring magnet to be implantea at the outlet of the intestine, as well as a stopper for same, comprising a bar magnet of permanent or soft magnetic material inserted in a sheath of chemically-softened open-cell polyvinyl acetal foam.
Magnetic closures of this kind are already known. In German Patent 23 63 563 there is described one form of such a magnetic closure, in which a ring-shaped permanent magnet, which grips around the outlet of the intestine, is implanted just below the cover of the abdomen and in which the closing part is designed as a closing plate or cap. In the German published application 24 47 682, this cap is improved, to the extent that it is equipped with an additional permanent magnet or soft iron part, which has an axial magnetized magnetic core, which reaches ~ into the implanted magnetîc system.
} Disadvantageous in the previously known magnetic `
~ closures is, on the one hand, the cap lying on the cover of the !: :
abdomen, and, on the other hand, the circumstances that the ;
` 20 closing part projecting into the ring magnet is not sealed ~i`
against the intestinal outlet.
~ The invention attacks the problem of providing a `
= magnetic closure for an artificial intestinal outlet which is ~ -so constructed that it can be set flush with the cover of the -~ abdomen and in which a hygienically perfect sealing, of good effect for a long time, is present.
According to one aspect of the invention this problem ~?. iS solved by the provision of a magnetic closure for an arti--`~ ficial intestinal outlet, said closure comprising a ring magnet adapted to be implanted around said outlet, a stopper for said outlet, said stopper comprising a circularly cylindrical bar magnet and a sheath adapted to enclose said bar magnet, said sheath being formed of open-cell polyvinyl acetal foam material, : ~ ` ' '7~j~
and a wit'ldl-awal S~.Li.ng being :;eeured to said sJ~ th.
~ ccording to a ~nr-ther aspect of the lnv~ntion ther~
is provided a method of preparing a magnetic closure for arl artificial intestinal outlet, said method comprising the steps of providing a sheath of open-cell polyvinyl acetal foam of cylindrical configuration and having an axial passageway therein, said sheath being in dry condition and relatively hard, softening said sheath with a softening fluid, whereby - to transform it into a condition in which it becomes soft and elastie, and then inserting a magnet in said passageway.
The invention is explained in detail below with reference to the attached drawings.
Other objects and advantages of my inven~ion will be apparent during the course of the following description.
In the accompanying drawings forming a part of this specifica-tion, and in whieh li~e numerals are employed to designate like parts throughout the same, Fig. 1 is a schematie longitudinal section through an artificial intestinal outlet with built-in magnetie closure.
Fig. 2 is a schematie longitudinal seetion through a preferred form of exeeution of the stopper.
Fig. 3 is a schematie longitudinal section through another form of execution of the stopper.
In Fig. 1 of the drawings, can be seen, fir~t of all, the end of the intestine 1, in whieh, as close as possible to the intestinal outlet 2, a ring magnet 3 is implanted. The ring magnet may consist of a sintered metal alloy, preferably one with high coereivity foree. Platinum-cobalt alloys or also samarium-cobalt alloys, have proved suitable materials.
It is advantageous if the permanent magnetlc ring is eoated with a plastie, compatible witn implantation, for example, based on polyoxymethylene. Instead of the metal alloys mentioned, however, oxide permanent magnetie materials may also 7~i~
be used~for example, ferrites w;th hi(JII cocr(ivi~y rorce.
rIl the preferred example of executioll, rcl~rcsented in Fig. 1, the permanent maynet has a radial magneti~ation, the North Pole lying at the inner mantle ~cylindrical~ surface of the ring magnet, and the South Pole at the outer mantle surface of the ring magnet. Particularly in oxide permanent magnetic materials, however, a different poling of the magnet is also possible; for example, one in which an alternating sequence of North and South Poles is arranged on the inner mantle surface, either in the direction of the longitudinal axis or in the circumferential direction. The last-mentioned poling has the advantage that the wall thickness of the magnetic ring implanted can be made slight.
For the magnetic ring 3 there is a stopper comprising a bar magnet 4, which also consists of permanent or soft magnetic material inserted in a sheath of chemically-softened open-cell polyvinyl acetal foam. In the example of execution represented in Fig. 1, a stopper of permanent magnetic material is chosen, on the outer mantle surface of which there is an alternating sequence of South and North Poles, extending in the direction of the longitudinal axis. But here also, a different sequence of magnetic poles may be chosen. The sequence represented in the drawing has, however, in combination with the ring magnet, also represented, the effect that the magnet falls into the desired position automatically in use.
According to the invention, the bar magnet 4 is arranged exchangeable in a sheath 5, which sheath consists of open-cell polyvinyl acetal foam. This precise material is especially good, since it is easy to process and is physiologi-cally unobjectionable The sheath 5 consists, in the preferred example shown,of an at least apprcximately circular cylinder 6, which has a central opening in its longitudinal axis, as well as a ~ - 3 -"1'7S'IL
with(lrawal strillg 8. It has prc~vc(l cspecially (~ood ~hen the c~rlinder 6 is thickel-ed at its ends 9, ]0, as re~f' ~n~cd in Fiy. 3. If a stopper formed in this way is used in the o~tlet
The invention relates to a magnetic closure for an artificial intestinal outlet, having a ring magnet to be implantea at the outlet of the intestine, as well as a stopper for same, comprising a bar magnet of permanent or soft magnetic material inserted in a sheath of chemically-softened open-cell polyvinyl acetal foam.
Magnetic closures of this kind are already known. In German Patent 23 63 563 there is described one form of such a magnetic closure, in which a ring-shaped permanent magnet, which grips around the outlet of the intestine, is implanted just below the cover of the abdomen and in which the closing part is designed as a closing plate or cap. In the German published application 24 47 682, this cap is improved, to the extent that it is equipped with an additional permanent magnet or soft iron part, which has an axial magnetized magnetic core, which reaches ~ into the implanted magnetîc system.
} Disadvantageous in the previously known magnetic `
~ closures is, on the one hand, the cap lying on the cover of the !: :
abdomen, and, on the other hand, the circumstances that the ;
` 20 closing part projecting into the ring magnet is not sealed ~i`
against the intestinal outlet.
~ The invention attacks the problem of providing a `
= magnetic closure for an artificial intestinal outlet which is ~ -so constructed that it can be set flush with the cover of the -~ abdomen and in which a hygienically perfect sealing, of good effect for a long time, is present.
According to one aspect of the invention this problem ~?. iS solved by the provision of a magnetic closure for an arti--`~ ficial intestinal outlet, said closure comprising a ring magnet adapted to be implanted around said outlet, a stopper for said outlet, said stopper comprising a circularly cylindrical bar magnet and a sheath adapted to enclose said bar magnet, said sheath being formed of open-cell polyvinyl acetal foam material, : ~ ` ' '7~j~
and a wit'ldl-awal S~.Li.ng being :;eeured to said sJ~ th.
~ ccording to a ~nr-ther aspect of the lnv~ntion ther~
is provided a method of preparing a magnetic closure for arl artificial intestinal outlet, said method comprising the steps of providing a sheath of open-cell polyvinyl acetal foam of cylindrical configuration and having an axial passageway therein, said sheath being in dry condition and relatively hard, softening said sheath with a softening fluid, whereby - to transform it into a condition in which it becomes soft and elastie, and then inserting a magnet in said passageway.
The invention is explained in detail below with reference to the attached drawings.
Other objects and advantages of my inven~ion will be apparent during the course of the following description.
In the accompanying drawings forming a part of this specifica-tion, and in whieh li~e numerals are employed to designate like parts throughout the same, Fig. 1 is a schematie longitudinal section through an artificial intestinal outlet with built-in magnetie closure.
Fig. 2 is a schematie longitudinal seetion through a preferred form of exeeution of the stopper.
Fig. 3 is a schematie longitudinal section through another form of execution of the stopper.
In Fig. 1 of the drawings, can be seen, fir~t of all, the end of the intestine 1, in whieh, as close as possible to the intestinal outlet 2, a ring magnet 3 is implanted. The ring magnet may consist of a sintered metal alloy, preferably one with high coereivity foree. Platinum-cobalt alloys or also samarium-cobalt alloys, have proved suitable materials.
It is advantageous if the permanent magnetlc ring is eoated with a plastie, compatible witn implantation, for example, based on polyoxymethylene. Instead of the metal alloys mentioned, however, oxide permanent magnetie materials may also 7~i~
be used~for example, ferrites w;th hi(JII cocr(ivi~y rorce.
rIl the preferred example of executioll, rcl~rcsented in Fig. 1, the permanent maynet has a radial magneti~ation, the North Pole lying at the inner mantle ~cylindrical~ surface of the ring magnet, and the South Pole at the outer mantle surface of the ring magnet. Particularly in oxide permanent magnetic materials, however, a different poling of the magnet is also possible; for example, one in which an alternating sequence of North and South Poles is arranged on the inner mantle surface, either in the direction of the longitudinal axis or in the circumferential direction. The last-mentioned poling has the advantage that the wall thickness of the magnetic ring implanted can be made slight.
For the magnetic ring 3 there is a stopper comprising a bar magnet 4, which also consists of permanent or soft magnetic material inserted in a sheath of chemically-softened open-cell polyvinyl acetal foam. In the example of execution represented in Fig. 1, a stopper of permanent magnetic material is chosen, on the outer mantle surface of which there is an alternating sequence of South and North Poles, extending in the direction of the longitudinal axis. But here also, a different sequence of magnetic poles may be chosen. The sequence represented in the drawing has, however, in combination with the ring magnet, also represented, the effect that the magnet falls into the desired position automatically in use.
According to the invention, the bar magnet 4 is arranged exchangeable in a sheath 5, which sheath consists of open-cell polyvinyl acetal foam. This precise material is especially good, since it is easy to process and is physiologi-cally unobjectionable The sheath 5 consists, in the preferred example shown,of an at least apprcximately circular cylinder 6, which has a central opening in its longitudinal axis, as well as a ~ - 3 -"1'7S'IL
with(lrawal strillg 8. It has prc~vc(l cspecially (~ood ~hen the c~rlinder 6 is thickel-ed at its ends 9, ]0, as re~f' ~n~cd in Fiy. 3. If a stopper formed in this way is used in the o~tlet
2 of the intestine, there is an especially firm contact in the zone of the two thickenings, so that, over all, a kind of labyrinth seal is formed.
In another preferred form of execution, the diameter of the central opening 7 is less than the diameter of the rod-shaped magnet 4 to be set therein. In such a sheath, the magnet can only be introduced when the sheath has been softened by suitable measures. How this takes place will be described farther on. But if the magnet is used in ~set into) such a softened sheath, it is perfectly solidly seated and cannot slip or fallout by yielding.
In another preferred form of execlltion, it is proposed that the central opening 7 be closed at one end 11. This is the end toward the interior of the body when in use. Such a closing has the advantage that the magnet 4 is shielded on all sides from the inner space of the intestine and cannot come in contact with the discharge materials occurring. To obtain an especially solid seating of the magnet 4 in the inside of the sheath 5, it is further proposed that the central opening 7 be tapered at the end 12, lying opposite the closed end 11. The tapered end grips over the outer end surface 13 of the magnet 4 and holds this firmly clamped together. Naturally, such a form of execution cannot be obtained by simple drilling or stamping of cylindrical sections of polyvinyl acetal foam, in this case, it is necessary to produce the shea'hs by foaming out in a corresponding mold, piece by piece (one at a time).
The proposed sheath has a withdrawal string 8, with the aid of which the sheath with the magnet 4 can be drawn out when necessary from the outlet of the intestine.
The withdrawal string may, in principle, be fastened fS~
to the slleath in any .~esired W~ly. It ~las i~LOV~ eipecially advantac~eo~ls, however, to clrc~w the wit}lclrc~a 1 .s tr;.ng throl~yh the slleath, doubled in the form of a loop, an(l so that lhe two string sections 14, 15 run parallel with each other ànd also with the central opening 7. The two string sections are closed at the end 11 by a string bridge 16 for the loop, the string bridge 16 being drawn into the soft foam material some-what, so that it can be hardly seen, or not at all, from outside.
The two string sections 14, 15 are joined with each other at the outlet end, for example, by a knot 17. As a material for the production of the withdrawal string, cotton is especially suitable; other materials, such as nylon, etc., may also be considered, however.
The use of the open-cell polyvinyl acetal foam materials, known per se, is especially advantageous in the present case. It has been found that this material, in the dry condition, is perfectly impervious to bacteria, molds or other microorganisms. The material is relatively hard, in the dry condition, but it can be softened in a short time by simply wetting with water, by which it is transformed into a resilient elastic rubber-l:ike condition. After the evaporation of the softening water, it becomes hard again. This re-hardening is undesirable in the present connection, so that it is proposed the following solution be used as softening fluid:
Distilled water 40% by weight Propylene glycol 1,2 20% by weight Ethyl alcohol 39.5~ by weight Glycerine 0.5% by weight If the polyvinyl acetal foam material is softened with the use of such a solution, it remains rubber-elastic for a practically unlimited time. The propylene glycol and glycerine content of the composition also have the effect that the sheath can be set into the outlet of the intestine easily ~ - 5 -- 1~19754 ` and witho~t unpleasant irritating friction.
In a further development of the invention, it has proved advantageous when the polyvinyl acetal foam material forming the sheath 5 is waterproofed on its inner surface. In this way, the fluid absorption power of the stopper can be ~ limited, without impairing the desired rubber-elasticity and j softness. All known agents are suitable, in principle, for carrying out the waterproofing. Silicones are preferred, however, since these have proved especially non-irritating and have good compatibility.
~' It is also possible to waterproof chemically the polyvinyl acetal foam to be used, namely by using as acetal-i forming aldehydes, not the usual formaldehyde, acetaldehydç or other short-chain aliphatic aldehydes, but rather, long-chain aliphatic aldehydes, especially stearyl aldehyde or the like.
~i By the incorporation of these long molecule chains, the other-wise hydrophil polyvinyl acetal foam takes on more or less -waterproof properties, while the degree of waterproofing can be `, adjusted by a suitable choice of chain lengths.
,i`
The intestinal closing sheaths, proposed according to the invention, are produced and packed sterile, in a dry condition, without the magnets set in. When they are . .
to be used, the user takes out the sheath and softens it in ; water or a suitable solution, especially one with the compositiongiven above. The sheath is transformed, in a few minutes, to the desired elastic condition. In this condition, the magnet, - which consists either of soft or permanently magnetic material, can easily be set in, the sheath being somewhat compressed ~; internally, usually. In the case of a design with tapered end 12, it is easily possible to press the magnet into the inner hollow space and let the tapered end snap over outside. In this condition, the stopper is set into the intestinal outlet 2, -~ while, by magnetic exchange effect with the ring magnet 3, it pushes into the correct position, shown in Fig. 1.
~ - 6 -,.~ .
In another preferred form of execution, the diameter of the central opening 7 is less than the diameter of the rod-shaped magnet 4 to be set therein. In such a sheath, the magnet can only be introduced when the sheath has been softened by suitable measures. How this takes place will be described farther on. But if the magnet is used in ~set into) such a softened sheath, it is perfectly solidly seated and cannot slip or fallout by yielding.
In another preferred form of execlltion, it is proposed that the central opening 7 be closed at one end 11. This is the end toward the interior of the body when in use. Such a closing has the advantage that the magnet 4 is shielded on all sides from the inner space of the intestine and cannot come in contact with the discharge materials occurring. To obtain an especially solid seating of the magnet 4 in the inside of the sheath 5, it is further proposed that the central opening 7 be tapered at the end 12, lying opposite the closed end 11. The tapered end grips over the outer end surface 13 of the magnet 4 and holds this firmly clamped together. Naturally, such a form of execution cannot be obtained by simple drilling or stamping of cylindrical sections of polyvinyl acetal foam, in this case, it is necessary to produce the shea'hs by foaming out in a corresponding mold, piece by piece (one at a time).
The proposed sheath has a withdrawal string 8, with the aid of which the sheath with the magnet 4 can be drawn out when necessary from the outlet of the intestine.
The withdrawal string may, in principle, be fastened fS~
to the slleath in any .~esired W~ly. It ~las i~LOV~ eipecially advantac~eo~ls, however, to clrc~w the wit}lclrc~a 1 .s tr;.ng throl~yh the slleath, doubled in the form of a loop, an(l so that lhe two string sections 14, 15 run parallel with each other ànd also with the central opening 7. The two string sections are closed at the end 11 by a string bridge 16 for the loop, the string bridge 16 being drawn into the soft foam material some-what, so that it can be hardly seen, or not at all, from outside.
The two string sections 14, 15 are joined with each other at the outlet end, for example, by a knot 17. As a material for the production of the withdrawal string, cotton is especially suitable; other materials, such as nylon, etc., may also be considered, however.
The use of the open-cell polyvinyl acetal foam materials, known per se, is especially advantageous in the present case. It has been found that this material, in the dry condition, is perfectly impervious to bacteria, molds or other microorganisms. The material is relatively hard, in the dry condition, but it can be softened in a short time by simply wetting with water, by which it is transformed into a resilient elastic rubber-l:ike condition. After the evaporation of the softening water, it becomes hard again. This re-hardening is undesirable in the present connection, so that it is proposed the following solution be used as softening fluid:
Distilled water 40% by weight Propylene glycol 1,2 20% by weight Ethyl alcohol 39.5~ by weight Glycerine 0.5% by weight If the polyvinyl acetal foam material is softened with the use of such a solution, it remains rubber-elastic for a practically unlimited time. The propylene glycol and glycerine content of the composition also have the effect that the sheath can be set into the outlet of the intestine easily ~ - 5 -- 1~19754 ` and witho~t unpleasant irritating friction.
In a further development of the invention, it has proved advantageous when the polyvinyl acetal foam material forming the sheath 5 is waterproofed on its inner surface. In this way, the fluid absorption power of the stopper can be ~ limited, without impairing the desired rubber-elasticity and j softness. All known agents are suitable, in principle, for carrying out the waterproofing. Silicones are preferred, however, since these have proved especially non-irritating and have good compatibility.
~' It is also possible to waterproof chemically the polyvinyl acetal foam to be used, namely by using as acetal-i forming aldehydes, not the usual formaldehyde, acetaldehydç or other short-chain aliphatic aldehydes, but rather, long-chain aliphatic aldehydes, especially stearyl aldehyde or the like.
~i By the incorporation of these long molecule chains, the other-wise hydrophil polyvinyl acetal foam takes on more or less -waterproof properties, while the degree of waterproofing can be `, adjusted by a suitable choice of chain lengths.
,i`
The intestinal closing sheaths, proposed according to the invention, are produced and packed sterile, in a dry condition, without the magnets set in. When they are . .
to be used, the user takes out the sheath and softens it in ; water or a suitable solution, especially one with the compositiongiven above. The sheath is transformed, in a few minutes, to the desired elastic condition. In this condition, the magnet, - which consists either of soft or permanently magnetic material, can easily be set in, the sheath being somewhat compressed ~; internally, usually. In the case of a design with tapered end 12, it is easily possible to press the magnet into the inner hollow space and let the tapered end snap over outside. In this condition, the stopper is set into the intestinal outlet 2, -~ while, by magnetic exchange effect with the ring magnet 3, it pushes into the correct position, shown in Fig. 1.
~ - 6 -,.~ .
Claims (14)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A magnetic closure for an artificial intestinal outlet, said closure comprising a ring magnet adapted to be implanted around said outlet, a stopper for said outlet, said stopper comrpising a circularly cylindrical bar-magnet and a sheath enclosing said bar magnet, said sheath formed of open-cell polyvinyl acetal foam material, said sheath being of approximately circular cross-section and of enlarged diameter adjacent its ends and having an axial opening closed at one end and being inwardly tapered at the end opposite said closed end, and a withdrawal string secured to said sheath.
2. A magnetic closure for an artificial intestinal outlet, said closure comprising a ring magnet adapted to be implanted around said outlet, a stopper for said outlet, said stopper comprising a circularly cylindrical bar-magnet and a sheath enclosing said bar magnet, said sheath formed of open-cell polyvinyl acetal foam material and being water-proofed on its inner surface, said sheath being of approximately circular cross-section and of enlarged diameter adjacent its ends and having an axial opening closed at one end and being inwardly tapered at the end opposite said closed end, and a withdrawal string secured to said sheath.
3. A magnetic closure for an artificial intestinal outlet, said closure comprising a ring magnet adapted to be implanted around said outlet, a stopper for said outlet, said stopper comprising a circularly cylindrical bar magnet and a sheath enclosing said bar magnet, said sheath formed of open-cell polyvinyl acetal foam material and being of approximately circular cross-section and of enlarged diameter adjacent its ends and having an axial opening closed at one end and being inwardly tapered at the end opposite said closed end, said sheath, in its initial condition being dry and relatively hard, but capable of being softened in a relatively short period by wetting with a softening fluid whereby it is transformed into a resilient eleastic rubber-like condition, and a withdrawal string secured to said sheath.
4. A method of preparing a stopper for an artificial intestinal outlet, said method comprising the steps of providing a sheath of open-cell polyvinyl acetal foam of cylindrical configuration and having an axial passageway therein, said sheath being in dry condition and relatively hard, softening said sheath with a softening fluid, whereby to transform it into a condition in which it becomes soft and elastic, and then inserting a magnet in said passageway.
5. A method according to claim 4, wherein the wall of said passageway is water proofed.
6. A magnetic closure for an artificial intestinal outlet, said closure comprising a ring magnet adapted to be implanted around said outlet, a stopper for said outlet, said stopper comprising a bar magnet and a sheath adapted to enclose said bar magnet, said sheath being formed of open-cell polyvinyl acetal foam material, and a withdrawal string being secured to said sheath.
7. A magnetic closure according to claim 6, wherein the bar magnet is of permanent magnetic material.
8. A magnetic closure according to claim 6, wherein the polyvinyl acetal foam material forming the sheath is water-proofed on its inner surface.
9 A magnetic closure according to claim 6, wherein the polyvinyl acetal foam material forming the sheath is waterproofed with silicones on its inner surface.
10. A magnetic closure according to claim 6, wherein the sheath is of approximately cylindrical form having an axial opening therein.
11. A magnetic closure according to claim 10, wherein the sheath is thickened at its ends.
12. A magnetic closure according to claim 10, wherein the diameter of the axial opening is less than the diameter of the bar magnet adapted to be disposed therein.
13. A magnetic closure according to claim 10, wherein the axial opening in the sheath is closed at one end.
14. A magnetic closure according to claim 13, wherein the axial opening in the sheath is tapered at the end opposite the closed end thereof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000324545A CA1119754A (en) | 1979-03-30 | 1979-03-30 | Magnetic closure for an artificial intestinal outlet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000324545A CA1119754A (en) | 1979-03-30 | 1979-03-30 | Magnetic closure for an artificial intestinal outlet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1119754A true CA1119754A (en) | 1982-03-16 |
Family
ID=4113875
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000324545A Expired CA1119754A (en) | 1979-03-30 | 1979-03-30 | Magnetic closure for an artificial intestinal outlet |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1119754A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022105854A1 (en) * | 2020-11-20 | 2022-05-27 | 天臣国际医疗科技股份有限公司 | Anastomotic stoma protection device |
-
1979
- 1979-03-30 CA CA000324545A patent/CA1119754A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022105854A1 (en) * | 2020-11-20 | 2022-05-27 | 天臣国际医疗科技股份有限公司 | Anastomotic stoma protection device |
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| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |