JPH03282068A - Leakage preventive device at time when fluid sealing seal is mounted around rotatable driving shaft - Google Patents

Abstract

PURPOSE: To establish a fluid-tight seal around a rotatable driving shaft by providing an annular seal member, a housing and an actuator for pressing the seal member to the housing and fastening the same to a shaft to establish a liquid-tight seal. CONSTITUTION: When a knob 52 is rotated so that an actuator 24 advances into a hole 26 of a housing 20, a seal member 22 is pressed to an inclined portion 32 and a substantially throttled on a driving shaft 14 through a hole 38. When the hole 38 is throttled on the driving shaft 14, a liquid-tight seal effect is obtained between the driving shaft 14 and the seal member 22, and on the other hand, the driving shaft 14 is still permitted to rotate with respect to the seal member 22 and a device 10. The throttling action of the hole 38 is heightened by a difference between the diagonal cut angle 46 and the inclination angle 48, and the inclined portion 32 deforms a diagonal cut end portion 36, so that the hole 38 is effectively throttled on the driving shaft 14.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to apparatus that can be used to establish fluid-tight seals between separate structural components. More specifically, the present invention provides a method for establishing a fluid-tight seal between structural elements that move relative to each other and for maintaining the fluid-tight seal when the same structural elements are adjusted or separated. This is about a device that can do this. Particularly, but not exclusively, the present invention establishes a fluid-tight seal around a rotatable drive shaft and prevents such fluids from entering or removing the shaft from a rotary drive assembly. Useful for maintaining a hermetic seal.

BACKGROUND OF THE INVENTION There are many instances where some type of fluid-tight seal is desirable or necessary, such as in medical applications, to prevent loss of fluid or to prevent fluid from becoming contaminated by contact with or reaction with contaminants. Fluid-tight seals are required whenever it is necessary to prevent The problems that must be overcome to establish one are particularly onerous.

Not surprisingly, as any technology advances, new developments are induced and achieved in related technologies. For example, several but different developments have been achieved in the field of arrhythmia surgery. Stated very simply, the arterial scaffold IAH cuts the narrowed part of the artery by removing the thrombus from the arterial shell.
Arterial surgical devices are used in vascular surgery to carry out such surgical procedures because of the mechanical requirements placed on them.More specifically: Specifically, arterial surgical devices have rotating parts that must function simultaneously both inside and outside the body without causing excessive blood loss.

For example, in the cutter J (Application No. 213,691) for a U-artery surgical device, which was filed at the same time as the rightful person of the present invention, the arterial surgical device It is necessary to rotate the cutter element within the artery by the outer drive conite in order to excise the thrombus from the artery.

Since both the rotary cutter and the rotary drive shaft must be placed within the artery and manipulated by equipment external to the body, some means should be provided to allow their manipulation to occur without excessive blood loss. There is a need to.

Furthermore, a variety of acceptable drive shafts with six different diameters must be used. In addition, it may be necessary to change the drive shaft or cutter;
It may become necessary to rotate the driving shaft at a fast speed for a long period of time. To this end, the drive shaft and cutter are typically placed inside the catheter sheath, which allows access to the artery. By extending into the artery, the catheter sheath also effectively prevents the rotating elements of the arterial surgical device from coming into direct contact with tissue other than the obturator being removed. Even with such precautions, however, blood can enter the sheath and a fluid-tight seal is therefore required to prevent white fluid from being lost through the gap between the sheath and the rotating drive shaft. . The fluid-tight seal must also be maintained during drive shaft changes. As understood,
This includes moving the various drive shafts into and out of the sheath. Therefore, it is specifically contemplated by the present invention to maintain the fluid-tight seal necessary for proper operation of the surgical device.

In view of the foregoing, it is an object of the present invention to provide an apparatus for establishing a fluid-tight seal around a rotatable drive shaft operable for drive shafts of different zero diameters. Another object of the invention is to provide an apparatus for establishing a fluid-tight seal around a rotatable shaft so that the drive shafts can be interchanged or substituted for each other. Yet another object of the invention is to provide a pupil that allows various shafts to be interchanged or substituted for each other without loss of fluid. Yet another object of the present invention is to provide an apparatus for establishing a fluid-tight seal around a rotatable drive shaft that is capable of withstanding substantial fluid pressures. It is a further object of the present invention to provide an apparatus for establishing a fluid-tight seal around a rotatable drive shaft, which is easy to operate, relatively simple to manufacture, and thus relatively cost competitive. The purpose is to provide equipment.

SUMMARY OF THE INVENTION An apparatus for establishing a fluid-tight seal about a rotatable drive shaft includes an annular seal member, a housing for retaining the seal member about the shaft, and a housing for retaining the seal member about the shaft. and an actuator for establishing a fluid-tight seal by pressing against and tightening against the shaft. The device also includes a seal valve mounted within the housing that automatically closes to prevent loss of fluid when the shaft is removed from the housing. More specifically, the housing is a rigid member in which a longitudinal hole is formed, and a drive shaft is disposed in the hole.

Additionally, the hole is formed with a narrow tubular portion, a wide tubular portion axially aligned with the narrow portion, and an angled portion providing a transition between the wide and narrow portions. has been done.

The seal member of the present invention is in the form of an annular tube,
The tube is beveled at one end to form an aperture, and the tube also includes a radial ring extending circumferentially from its outer surface. In addition, the seal member includes a radial groove formed within its inner surface. When the seal member cooperates with the housing, its beveled end contacts the sloping portion of the hole and seats within the wide portion of the hole, aligning the hole in the seal member with the narrow portion of the hole. . In such a seated position, the ring on the outer surface of the seal member is in fluid-tight engagement with the surface of the wide portion.

The actuator is a tubular shaped member having a longitudinal passageway defined therein, the passageway being axially aligned with a bore in the housing when the actuator and housing are mated. As a connecting element, the actuator has a threaded part that can be threadedly engaged with the housing.

Further, the 7-mouth eater is provided with a detent ring that can snap-engage with the groove of the seal member and hold the seal member relative to the actuator. Thus,
Relative movement between the actuator and the housing resulting from rotation of the actuator also induces relative movement between the seal member and the housing.

More specifically, as the actuator rotates and advances into the bore of the housing, the actuator forces the beveled end of the seal member against the beveled portion of the housing. This interaction of the seal member and housing lock causes the aperture in the seal member to be constricted. Thus, when the drive shaft is positioned in the passageway of the actuator and also in the bore of the housing, the restriction of the bore causes the seal member to establish a fluid-tight seal between the drive shaft and the gate of the seal member. Conversely, when the actuator is rotated and pulled out of the hole in the housing, the seal member is pulled out of the sloping portion of the hole. As a result, the hole is opened and the seal member is severed from the drive shaft thereby destroying the fluid-tight seal established therebetween.

In another embodiment, the narrow portion of the housing includes an enlarged conformable portion that includes an annular groove in which the seal valve is seated. More specifically, the seal valve includes a hollow cylindrical base including an outer annular portion configured to mate within the annular vortex of the enlarged compliant portion.

A hollow wedge-shaped portion formed by a pair of flexible flaps is integral with the base of the sealing valve.

The flexible flaps are inclined from the cylindrical base to form long narrow holes or slits which are resiliently biased toward each other so that the slits are normally closed.

The flap is sufficiently flexible so that the drive shaft can be placed in the slit of the sealing valve, while it is also sufficiently rigid so that the shaft can be placed in the sealing valve slit. When removed from the housing, the flaps are biased together to close the slit and create a fluid barrier across the housing.

In addition, the seal valve flap serves to prevent fluid from flowing through the housing while the shaft is operatively inserted into the housing. The seal valve is positioned with its annular ring portion fitting within the annular groove of the housing and its wedge-shaped portion located within the narrow portion of the expanded configuration of the housing.

In other words, the seal valve is seated such that, in cooperation with the housing, the annular ring engages the vortex within the inner surface of the housing to form a fluid-tight engagement between the seal valve and the housing. has been done. Seated W
The seal valve marked IA#J is positioned such that the hollow wedge-shaped portion faces in the same direction as the insertion direction of the drive shaft. Thus, when the drive shaft is placed in the passage of the actuator and also in the bore of the housing, it enters the open end of the cylindrical base of the sealing valve and in the opposite aS part of said wedge-shaped part. Come out through the slit. Each flap forming the wedge-shaped portion deforms to accommodate a drive shaft. Each flap, however, is sufficiently flexible and pliable to seal onto the shaft, prevent leakage around the shaft, and return to its original wedge shape, allowing the drive shaft to clear the sealing valve. The slit can be closed after being pulled out.

The present invention will be described in more detail below with reference to the accompanying drawings.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring initially to FIG. 1, an apparatus for establishing a watertight seal around a rotatable drive shaft is illustrated and designated generally at 10. As shown, the mounting [10
is used within the atherectomy system,
The system basically includes a drive unit 12 which rotates both a drive shaft 14#l and a cutter (not shown) attached to the drive shaft. A sheath 18 is in fluid-tight engagement with the device M10 and extends from the device 10 into the artery of the patient 16. Sheath 18 thus encloses drive shaft 14 and a cutter (not shown). said sheath 1 in an encircling position;
8 prevents the rotary drive shaft 14 from coming into direct contact with tissue other than body tissue to be removed from the stenotic segment of the artery by the rotational action of the cutter. Device 10 of the invention
A complete description of the arterial delivery system that can be used is provided in co-pending application no.
It is given in the specification of No.

As more readily seen in FIG. 2, the apparatus 10 includes a housing 20, a seal member 22 and an actuator 24.
have. Specifically, the housing 20 is a cylindrical component having a hole 26 formed therein, the hole 26 having a narrow portion 28, a wide portion 30, and an inclined portion 32 of intermediate width. ing. As shown in FIG. 2, the wide portion 30 is formed with a thread 34 which provides a means for engaging the housing 20 with the actuator 24 for purposes described below. Preferably, housing 20 is made from a rigid material such as plastic or metal.

Seal member 22 is tubular in shape, as shown in FIG. 2, and has a beveled end 36 surrounding and defining aperture 38.
It is equipped with A raised ring 39 is provided on the seal portion @ 22 remote from the beveled end 36 and is formed radially on the outer surface 40 of the member 22 and circumferentially on the outer surface 40 of the member 22. extends around. On the inner surface 42 of the sealing member 22 there are approximately 44
is formed. Preferably, seal member 22 is made of a flexible, elastomeric material such as rubber.

For comparison purposes, the bevel angle 46 defined between the surface 40 of the member 22 and the surface of the beveled end 36 is greater than the width of the narrow portion 2.
8 to the sloped portion 32
Preferably, it is smaller than 8. This is desirable because the bore 38 is constricted whenever the beveled end 36 of the sealing member 22 is pressed against the beveled portion 32 within the bore 26 of the housing 2o. This is to ensure that.

The cutout 24 of the device 110 is shown in FIG. 2 as an elongated member with a passageway 50 formed therein. A knob 52 is formed on the actuator 24 for rotating it, and a threaded shaft 54 connects the actuator 24 to the housing 2.
It is provided for screw engagement with 0. Actuator 24 also connects sealing member 22 to actuator 24.
A radial engagement flange 56 is provided which can be snapped into engagement with the flange 44 of the seal member 22 for retention thereon.

The cooperation of the #IJ structure on the parts of device 10 is perhaps best illustrated in FIG. 3A. In FIG. 3A, flange 56 of actuator 24 is seated within seal 44 of seal member 22 to retain seal member 22 on actuator 24. In FIG. Further, the threaded shaft 54 of the actuator 24 is connected to the threaded shaft 54 of the housing 20.
4, the actuator 24 is connected to the housing. Due to this IlI structure, the seal member 2
2 is disposed within the wide portion 30 of the hole 26, and the sealing member 2
The second hole 38 is aligned with the narrow portion 28 of the hole 26 and the passage 5o of the actuator 24.

This alignment is achieved by actuator 24 as shown in FIG. 3A.
, seal member 22 and housing 2o enclose drive shaft 14 and allow drive shaft 14 to fully extend apparatus 10.

As can be seen by comparing FIGS. 3A and 3B, the actuator 24 is attached to the housing 2 along with the seal member 22.
It is movable relative to 0. To be more specific, the third
In the position shown in Figure A, the hole 38 is free from the drive shaft 14 and the seal member 22
No fluid-tight seal is established between them. According to this shape, the operator can use the drive shaft 14 as described above.
can be removed and replaced. On the other hand, the knob 52 is rotated and the actuator 24 is inserted into the hole 26 of the housing 2o.
When advanced inward, seal member 22 is pressed against ramped portion 32, narrowing aperture 38 onto drive shaft 14, substantially as shown in FIG. 3B. When the hole 38 is narrowed onto the drive shaft 14 in this way, a fluid-tight sealing effect is obtained between the drive shaft 14 and the seal member 22111, while the drive shaft 14 is still rotated around the seal member 22 and the device f10. Permissible. As will be understood by those skilled in the art, the constricting action of the hole 38 is enhanced by the difference between the bevel angle a46 and the bevel angle W148 (i.e., bevel angle W146 is smaller than the bevel angle 48), deforms the beveled end 136 and effectively narrows the hole 38 onto the drive shaft 14. Further, as those skilled in the art will appreciate, the beveled end 36 contacts the beveled portion 32, thereby causing the seal member 2 to
A fluid-tight seal is established between the housing 20 and the housing 20. Also shown in FIGS. 3A and 3B, ring 39115 of seal member 22 engages the surface of wide portion 30 to induce a fluid-tight seal between seal member 22 and housing 20. Thus, as shown in FIG. 3B, with a fluid-tight seal between seal member 22 and housing 20 and a fluid-tight seal between seal member 22 and drive shaft 14, apparatus 10 The Nll+ unit 12 is brought into full fluid-tight engagement with the sheath 18. Accordingly, the diversion element can be manipulated in isolation from a given tissue with essentially no loss of bodily fluids. As will be understood by those skilled in the art, by properly manipulating the knob 52 on the actuator 24, the seal member 22 can be disengaged from the sloped portion 32 of the housing 20 and the shape shown in FIG. 3A can be re-established. , removal or replacement of drive shaft 14 is permitted.

Importantly, the actuator 24 and seal member 22 are intermeshed with each other in a tethered relationship. Accordingly, seal member 22 and actuator 24 are moved in unison. Thus, as the actuator 24 is advanced into the bore 26, the seal member 22 engages in a fluid-tight relationship around the drive shaft 14. On the other hand, when the actuator 24 is pulled out from the hole 26, the seal member 22 is firmly disengaged from the drive shaft 14.

Another embodiment of the invention is shown in FIGS. 4A, 4B and 4C. In particular, the device f10 includes a housing 20 with an enlarged compliant portion 60 near the narrow portion 28. An annular groove 62 is located between the matching portion 60 and the narrow portion 28 . Seated within the annular groove 62 is a seal valve 64, preferably made of a flexible, resilient material such as rubber.

More specifically, the seal valve 64 has a hollow cylindrical base 66.
The base includes an outer annular ring portion 68 that fits within the annular ring 62.

A hollow wedge-shaped portion 70 is provided formed on the cylindrical base 66 . As perhaps best seen in FIGS. 5A and 58, the wedge-shaped portion 70 of the seal valve 64 is formed by a pair of generally flat, resiliently flexible flaps 72.

The flaps 72 are resiliently biased relative to each other and slope from the cylindrical base 66 into a long ring of narrow holes or slits 74. As shown in FIG. 5A, flap 72 is normally biased closed. The flap 72 is also flexibly deformable, as seen in FIG. 5B, so that the drive shaft 14 can be inserted into the slit 74. When the shaft 14 is disposed within the seal valve 64, the flap 72 envelops the shaft 14 in a manner that somewhat restricts fluid flow, but still allows movement of the shaft 14.

The operation of seal valve 64 incorporated within housing 20 is best seen in FIGS. 4A, 4B, and 4C. In FIG. 4A, drive shaft 14 has been inserted into actuator 24 and seal member 22. In FIG. As shown in this configuration, the end 76 of the drive shaft 14
is located within the wide portion 30 of the housing 20.

In the absence of seal valve 64, if fluid were to be within this wide portion 30, it would likely leak out <i*10. For example, such leakage would occur around the shaft 14 and along the inner surface 42. This is because the actuator 24 has not yet been tightened so that the seal member is in fluid tight engagement with the shaft 14 as shown in FIGS. 3B and 4C. Accordingly, a seal valve 64 is disposed within the housing 20 as shown in FIG. 4A! fluid is prevented from leaking into the widened portion 30 from the fluid volume held within the sheath 18. More importantly, if the shaft 14 is completely removed from the device 110 with fluid retained within the sheath 18 (such as when replacing the shaft 14), the seal valve 64 will prevent fluid from leaving the device 10. Through sheath 1
It is necessary to prevent them from going outside. When the shaft 14 of the wedge-shaped portion 70 is removed, additional fluid back pressure resulting from the fluid within the sheath 18 is applied to the flap 7.
2, sealing valve 64 is closed, thus providing a tighter fluid-tight seal.

Drive shaft 14 can continue to slide into sheath 18 through slit 74 in hollow seal valve 64, as shown in FIG. 4B. As illustrated in FIG. 5B, fluid leakage is also minimized in this case due to the elastic action of the flap 72 surrounding the shaft 14. Furthermore, the fluid pressure on the outside of the inclined flap 72 causes the shaft 1
4 to help maintain a relatively tight sealing effect around the 4.

An alternative embodiment 64' of the seal valve is shown in FIGS. 6 and 7. In this embodiment, the hollow base 66 is elongated and the outer ring 68 is located at the end opposite the wedge-shaped portion 70. The hollow cylindrical base 66 includes a ring 68 that provides a snug fit with the filler 62 of the enlarged narrow portion 60.

Thus, the seal valve 64' is also substantially similar to that shown in FIG. 4A.
It fits within the housing 20 as shown in Figures B and 4C and operates in the same manner as the seal valve 64, and
provides a seal that can be closed around the shaft when placed through the slit 74.

While the particular seal for a torque rotary torque tube with a seal valve described in detail herein fully accomplishes the foregoing objectives and provides the foregoing advantages, the particular seal is a preferred embodiment of the present invention. Please note that these are merely illustrative examples, and the details of construction or design are not to be limited except by the scope of the claims.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the device of the present invention shown in combination with an arterial surgical device; FIG. 2 is an exploded view of the device of the present invention, with various parts shown in cross section for clarity. 3A is a cross-sectional view of the apparatus taken along line 3--3 in FIG. FIG. 4A is a cross-sectional view of the apparatus taken along line 3--3 of FIG. 1 in the condition shown in FIG. I looked along,
Figure 4B is a cross-sectional view of an embodiment of the present invention with a built-in seal valve.
A cross-sectional view taken along line 3--3 in Figure 1 of the apparatus of Figure 5A, separated from the seal member; Figure 4C shows the drive shaft engaged with both the seal valve and the seal member; The first diagram of the device shown in FIG.
5A is a perspective view of the seal valve shown separated from the drive shaft; FIG. 5B is a perspective view of the seal valve meshed with the drive shaft; 6 is a perspective view of an alternative embodiment of the seal valve, and FIG. 7 is a cross-sectional view of the seal valve of FIG. 6 taken along line 7--7. 14... Drive shaft, 18... Sheath, 20...
・Housing, 22... Seal member, 24... Actuator, 26... Hole, 28... Narrow part of hole,
3o...Wide part of the hole, 32...Slanted part of the hole, 3
8... Hole, 36... Beveled portion, 39... Raised ring, 54... Threaded shaft.

Claims (27)

[Claims] (1) A leakage prevention device for establishing a fluid-tight seal around a rotatable drive shaft, the device comprising: a resilient device radially surrounding the drive shaft; and retaining the resilient device on the drive shaft. a device; a pressing device for pressing the resilient device against the retaining device to squeeze the resilient device about the drive shaft to establish a fluid-tight seal; and a resilient valve device;
a valve device mounted within the retaining device with a reclosable slit to accommodate the drive shaft in the slit, the drive shaft being removed from the valve device to form the valve device as a fluid barrier; a resilient valve device in which the slit closes when the rotatable drive shaft is closed; and a leak-proof device to establish a fluid-tight seal around the rotatable drive shaft. (2) The leak prevention device of claim 1, wherein the valve device includes a cylindrical base with an outer ring;
A leak-proof device for establishing a fluid-tight seal around a rotatable drive shaft, characterized in that said slit is formed by a hollow wedge-shaped portion terminating in a reclosable bore. (3) The leakage prevention device according to claim 2, wherein the retaining device has a longitudinal portion including a relatively narrow portion, a relatively wide portion, and an inclined portion intermediate the narrow portion and the wide portion. A leakage prevention device when establishing a fluid-tight seal around a rotatable drive shaft, characterized in that a directional hole is formed. (4) The leakage prevention device according to claim 3, wherein the elastic device is tube-shaped, and has a beveled end defining a hole, and is in contact with the wide portion to connect the elastic device and the retainer. A leak-proof device when establishing a fluid-tight seal around a rotatable drive shaft, comprising a raised ring for establishing a fluid-tight seal between the devices. (5) In the leak prevention device according to claim 4, the pressing device engages with the holding device by pressing the beveled end of the elastic device against the inclined portion of the holding device. A leakage prevention device for establishing a fluid-tight seal around a rotatable drive shaft. (6) Leak prevention device according to claim 5, characterized in that the pressing device is threadedly engaged with the retaining device to prevent leakage when establishing a fluid-tight seal around a rotatable drive shaft. Device. (7) In the leakage prevention device according to claim 5, the elastic device is attached to the pressing device, and the pressing device has the hole on the holding device that releases the elastic device from the drive shaft. A rotatable drive shaft, wherein the rotatable drive shaft is movable between a first position in which the elastic device is expanded and a second position in which the elastic device is constricted to establish a fluid-tight seal around the drive shaft. Leakage prevention device when establishing a hermetic seal around the enclosure. (8) A leak prevention device according to claim 5, characterized in that said elastic device is made of an elastic material, when establishing a fluid-tight seal around a rotatable drive shaft. . 9. A leak prevention device according to claim 5, wherein the retaining device is made of a rigid material when establishing a fluid-tight seal around a rotatable drive shaft. . 10. Leak prevention device according to claim 5, characterized in that the pressing device is made of a rigid material, when establishing a fluid-tight seal around a rotatable drive shaft. . (11) A leakage prevention device for establishing a fluid-tight seal around a rotatable drive shaft, comprising: an annular seal having an aperture received through the drive shaft; and a pair of deformable flexible flaps. a resilient seal having flaps resiliently biased relative to each other to form a reclosable aperture for receiving the drive shaft; a housing retaining the annular seal and the seal valve on the drive shaft; a rotatable drive shaft having an actuator that engages the housing to compress the annular seal therebetween and throttle the aperture to establish a fluid-tight seal around the drive shaft; Leak prevention device when establishing a fluid-tight seal around. (12) The leak prevention device according to claim 11, wherein the housing includes a longitudinal hole having a relatively narrow portion, a relatively wide portion, and an inclined portion intermediate the narrow portion and the wide portion. wherein the seal is tube-shaped and includes a beveled end around the hole for contacting the beveled portion of the housing and a beveled end for contacting the wide portion between the seal and the housing. A leakage prevention device when establishing a fluid-tight seal around a rotatable drive shaft, characterized in that it comprises a circumferential ring for establishing a fluid-tight seal. (13) The leakage prevention device according to claim 12, wherein the actuator presses the beveled end against the inclined portion to engage with the housing and is movable relative to the housing. Leak prevention device when establishing a fluid-tight seal around the drive shaft possible. 14. The leak prevention device of claim 13, wherein the actuator is threadedly engaged with the housing to prevent leakage when establishing a fluid-tight seal around a rotatable drive shaft. Device. 15. The leak prevention device according to claim 13, wherein the seal is attached to the actuator, and the actuator is arranged on the housing so that the hole releasing the seal from the drive shaft is enlarged. a rotatable drive shaft, wherein the rotatable drive shaft is movable between one position and a second position in which the aperture of the seal is constricted to establish a fluid-tight seal about the drive shaft; Leakage prevention device when establishing a fluid-tight seal around. 16. A leak prevention device as claimed in claim 13 in establishing a fluid-tight seal around a drive shaft, wherein said seal is made of a resilient material. 17. A leak prevention device as claimed in claim 13, in which the housing establishes a fluid-tight seal around a rotatable drive shaft, wherein the housing is made of a rigid material. 18. The leak prevention device of claim 13, wherein the actuator is made of a rigid material when establishing a fluid-tight seal around a rotatable drive shaft. (19) A leakage prevention device for establishing a fluid-tight seal around a rotatable drive shaft, the device comprising a housing with a longitudinal hole, the hole being a relatively narrow portion, a housing having a relatively wide portion and an inclined portion intermediate the narrow portion and the wide portion, the relatively narrow portion including a mating portion; a resilient seal valve with a flexible hole that receives the drive shaft after being withdrawn and closes elastically, the seal valve being seated within the mating portion of the hole; a tube-shaped sealing member with a beveled end defining a circumferential ring, the sealing member being disposed within the widened portion of the hole, the ring being in contact with the widened portion; a tube-shaped seal member establishing a fluid-tight seal between the seal member and the housing, the beveled end contacting the beveled portion and the aperture aligned with the aperture; and a passageway. an actuator, the actuator meshing with the housing to align the passageway with the aperture and the drive shaft therethrough; an actuator movable to press the beveled end of the seal member, thereby constricting the aperture and establishing a fluid-tight seal about the drive shaft; Leakage prevention device when establishing a fluid-tight seal. 20. The leak prevention device of claim 19, wherein the seal valve has a hollow cylindrical base and a pair of deformable flaps terminating in a reclosable slit inclined from the base; a wedge-shaped portion formed by flaps that are elastically biased relative to each other. (21) The leak prevention device according to claim 20, wherein the actuator is attached to the sealing member, and is also on the housing, and the hole is enlarged by releasing the sealing member from the drive shaft. about a rotatable drive shaft, wherein the aperture is movable between a first position and a second position in which the aperture is constricted to establish a fluid-tight seal about the drive shaft. Leakage prevention device when establishing a fluid-tight seal. 22. A leak prevention device as claimed in claim 20 in establishing a fluid-tight seal around a rotatable drive shaft, wherein said seal is made of a resilient material. 23. A leak prevention device as claimed in claim 20, wherein the housing is made of a rigid material when establishing a fluid-tight seal around a rotatable drive shaft. 24. The leak prevention device of claim 20, wherein the actuator is made of a rigid material when establishing a fluid-tight seal around a rotatable drive shaft. (25) A leakage prevention device for establishing a fluid-tight seal around a rotatable drive shaft, the device comprising: a resilient device radially surrounding the drive shaft; and retaining the resilient device on the drive shaft. a device; selectively pressing the elastic device against the retaining device;
Either squeezing the resilient device around the drive shaft to establish a fluid-tight seal therewith, or releasing the resilient device from the drive shaft by separating the resilient device from the retaining device to establish a fluid-tight seal with the drive shaft. a leakage prevention device when establishing a fluid-tight seal around a rotatable drive shaft with a crushing pressing device; (26) The leakage prevention device according to claim 25, further comprising a valve device having a reclosable slit, the valve device being mounted in the holding device and accommodating the drive shaft through the slit. and the slit is a slit that closes when the drive shaft is removed from the valve device to form the valve device as a fluid-blocking barrier, a leak-proof device when establishing a fluid-tight seal around the rotatable drive shaft. . (27) The leakage prevention device according to claim 26, wherein the elastic device is attached to the pressing device, and the pressing device has a hole on the holding device that releases the elastic device from the drive shaft. a first position to be expanded;
a fluid-tight seal around a rotatable drive shaft, wherein the resilient device is movable between a second position in which the aperture is constricted to establish a fluid-tight seal around the drive shaft; Leakage prevention device when establishing a seal.