CN210819355U - Guide vane dismounting device for axial flow type ventricular assist pump - Google Patents
Guide vane dismounting device for axial flow type ventricular assist pump Download PDFInfo
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- CN210819355U CN210819355U CN201920964347.6U CN201920964347U CN210819355U CN 210819355 U CN210819355 U CN 210819355U CN 201920964347 U CN201920964347 U CN 201920964347U CN 210819355 U CN210819355 U CN 210819355U
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Abstract
The utility model discloses a guide vane dismounting device for an axial flow type ventricular assist pump, which comprises a clamping sleeve, a threaded sleeve and a threaded rod; the inner cavity of the clamping sleeve is cylindrical and is provided with a first clamping surface and a second clamping surface; the threaded sleeve is pressed on the clamping sleeve, the inner cavity of the threaded sleeve is cylindrical and is provided with a first cylindrical surface and a second cylindrical surface, internal threads are arranged on the first cylindrical surface, and the diameter of the second cylindrical surface is larger than that of the first cylindrical surface; the threaded rod part stretches into the threaded sleeve, an external thread is arranged in the middle of the threaded rod part and matched with the internal thread, so that the threaded rod can move in the axial direction along the first cylindrical surface, one end of the threaded rod stretching into the threaded sleeve is connected with the cylindrical connecting part, and the end face of the connecting part is connected with the plurality of L-shaped cantilevers. The utility model discloses can smoothly accomplish the dismantlement of stator to do not destroy stator and stator bearing or epaxial thrombus.
Description
Technical Field
The utility model relates to a dismounting device, concretely relates to a stator dismounting device for axial-flow type ventricle auxiliary pump.
Background
The ventricular assist pump is divided into a magnetic suspension type ventricular assist pump and a mechanical axial flow type ventricular assist pump. The axial flow type ventricular assist pump guide vane comprises a leading guide and a trailing guide. After animal experiments or clinical implantation experiments are completed, the ventricular assist pump needs to be disassembled and thrombus formation and the like in the pump are observed, and the animal experiments and the clinical experiments find that the shaft and the bearing are the connecting parts of all parts in the pump, are positions where thrombus in the mechanical axial-flow type ventricular assist pump is high, are one of the parts with the most serious problem of thrombus formation in the axial-flow type ventricular assist pump, and are the parts which need to be observed and evaluated most after the axial-flow type ventricular assist pump is disassembled. The leading guide and the trailing guide are generally installed on the inner wall of the auxiliary pump casing in an interference fit manner and are connected with a bearing or a shaft. Because the great mating force that its interference fit produced, the tradition utilizes the mode that tweezers dismantled the stator to cause mechanical damage to thrombus on the stator easily, also causes wearing and tearing to the thrombus on stator bearing or the axle easily, influences the observation effect.
Therefore, a new guide vane dismounting device is needed to solve the above problems.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a stator dismounting device for axial-flow type ventricle auxiliary pump, it is dismantling axial-flow type ventricle auxiliary pump stator in-process, does not destroy stator and stator bearing or epaxial thrombus.
For this purpose, the utility model provides a guide vane dismounting device for an axial flow type ventricular assist pump, which comprises a clamping sleeve, a threaded sleeve and a threaded rod;
the inner cavity of the clamping sleeve is cylindrical and is provided with a first clamping surface and a second clamping surface along the axial direction, and the diameter of the first clamping surface is equal to or larger than that of the second clamping surface;
the threaded sleeve is pressed on the clamping sleeve, the inner cavity of the threaded sleeve is cylindrical and is provided with a first cylindrical surface and a second cylindrical surface along the axial direction, at least the first cylindrical surface is provided with internal threads, and the end surface of one side of the second cylindrical surface of the threaded sleeve is pressed on the end surface of one side of the second clamping surface of the clamping sleeve;
the middle part of the threaded rod is provided with external threads, one end of the threaded rod is connected with a connecting part, the end face of the connecting part is connected with a plurality of L-shaped cantilevers, and the length of the threaded rod is larger than the sum of the axial lengths of the clamping sleeve and the threaded sleeve, so that the threaded rod can be screwed into the threaded sleeve, penetrates through the inner cavity of the clamping sleeve and extends out of a port on one side of the first clamping face.
Preferably, in the clamping sleeve, the diameter of the first clamping surface is larger than that of the second clamping surface, and a horizontal step is arranged between the first clamping surface and the second clamping surface; and/or when the threaded sleeve is pressed on the clamping sleeve, the first cylindrical surface, the second clamping surface and the first clamping surface are sequentially communicated; and/or the diameter of the second cylindrical surface of the threaded sleeve is larger than that of the first cylindrical surface, and the first cylindrical surface, the second clamping surface and the first clamping surface are communicated in sequence.
Preferably, the threaded rod is provided with a transverse through hole extending from the screw rod of the port on the side of the first cylindrical surface of the threaded sleeve, and a hand lever penetrates through the through hole to serve as a handle. .
Preferably, a plurality of the L-shaped cantilevers are connected to an outer edge of the end surface of the connecting portion at equal intervals.
Preferably, the number of the L-shaped cantilevers is 3.
Preferably, the L-shaped cantilever comprises a vertical arm parallel to the axis of the threaded rod and a transverse hook portion perpendicular to the vertical arm, the transverse hook portions on the plurality of L-shaped cantilevers extending in the same direction in a tangential direction of their rotational trajectories.
Preferably, the diameter of the circumferential trajectory of the crossbar portion is within ± 3mm from the midpoint of the vane radial length.
Preferably, the extension length of the transverse hook part is equal to or greater than the blade wall thickness of the guide vane by 2-5mm, preferably 3 mm.
Preferably, the diameter of the connecting portion is greater than the diameter of the threaded rod.
Preferably, the diameter of the connecting portion is 0.5 to 0.7 times the diameter of the guide vane impeller.
Preferably, the first cylindrical surface, the second cylindrical surface, the first clamping surface, the second clamping surface and the threaded rod have the same axis.
The utility model has the advantages that:
the utility model provides a stator dismounting device for axial-flow type ventricle auxiliary pump, it can utilize the surface of clamping sleeve clamping ventricle auxiliary pump to put the screw sleeve pressure on the clamping sleeve, make the threaded rod stretch into in the machine casket of ventricle auxiliary pump through rotatory threaded rod, and then make L shape cantilever catch on the short straight blade terminal surface of stator, the rethread reverse rotation threaded rod drives the stator along the outside motion of machine casket, can accomplish the smooth and easy dismantlement of stator. Based on the above structure of the utility model, dismantle the in-process at the stator, L shape cantilever can not touch stator bearing or axle, has avoided the wearing and tearing to the thrombus of stator bearing or axle, and L shape cantilever and stator are static relatively simultaneously, so can not destroy the thrombus on the stator yet.
Drawings
Fig. 1 is a schematic structural diagram of a guide vane detaching device for an axial-flow type ventricular assist pump according to an embodiment of the present invention.
Fig. 2 is a schematic view of a clamping sleeve structure in an embodiment of the present invention.
Fig. 3 is a schematic view of a structure of a threaded sleeve according to an embodiment of the present invention.
Fig. 4 is a schematic view of a threaded rod according to an embodiment of the present invention.
Fig. 5 is a schematic view of the structure of fig. 4 from another perspective.
Fig. 6 is a schematic diagram of the external surface structure of an axial flow ventricular assist pump.
Fig. 7 is a schematic diagram of the internal structure of an axial flow ventricular assist pump.
Fig. 8 is a schematic view of the guide vane detachment using the detachment apparatus provided by the present invention.
FIG. 8a is a schematic sectional view A-A of FIG. 8.
Fig. 9 is a schematic view of another detaching device provided by the present invention.
Fig. 10 is a schematic view of a guide vane detaching device using the present invention.
Detailed Description
Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
Referring to fig. 1 to 5 and fig. 8 and 8a, the main structure of a guide vane dismounting device for an axial flow type ventricular assist pump is exemplarily shown, and the guide vane dismounting device for the axial flow type ventricular assist pump in the present embodiment includes a clamping sleeve 1, a threaded sleeve 2 and a threaded rod 3.
Referring to fig. 2, 8 and 8a, the inner cavity of the clamping sleeve 1 is cylindrical and has a first clamping surface 11 and a second clamping surface 12, the diameter of the first clamping surface 11 is larger than that of the second clamping surface 12, and a horizontal step 13 is formed between the first clamping surface 11 and the second clamping surface 12.
The outer surface of the ventricular assist pump 4 is clamped by the first clamping surface 11, and the inlet end of the casing 41 of the assist pump faces the threaded sleeve 2. It should be noted that, the first clamping surface 11 is used to clamp the outer surface of the ventricular assist pump 4 in a matching manner, and at the same time, the horizontal step 13 can provide an axial location and support, so as to clamp the ventricular assist pump 4 more stably. The peripheral surface of the clamping sleeve 1 can be provided with symmetrical planes, so that the clamping sleeve is convenient to fix.
When the guide vane is detached, an axial flow type ventricular assist pump as shown in fig. 6 is inserted into the first clamping surface of the inner cavity of the clamping sleeve 1, and the internal structure of the assist pump is shown in fig. 7. The first clamping surface has a certain interference with the pump housing, so that the pump housing casing 41 does not move relative to one another when the guide vanes are removed.
In the embodiment shown in fig. 10, the first clamping surface 11 and the second clamping surface 12 of the clamping sleeve 1 are of equal diameter, and the auxiliary pump is clamped mainly by transition fit of the pump housing with the first clamping surface 11 when the guide vane is removed.
Referring to fig. 3, 8 and 8a, the threaded sleeve 2 is pressed on the clamping sleeve 1, and the inner cavity of the threaded sleeve is cylindrical and has a first cylindrical surface 21 and a second cylindrical surface 22, the first cylindrical surface 21 is provided with internal threads, and the diameter of the second cylindrical surface 22 is larger than that of the first cylindrical surface 21; wherein the first cylindrical surface 21, the second cylindrical surface 22, the second clamping surface 12 and the first clamping surface 11 are communicated in sequence. The outer surface of the threaded sleeve 2 may be round, square, etc., and the shape of the outer surface is not limited, and if it is square, or the outer surface has a plane of symmetry (as shown in fig. 1), it is more convenient to fix. Fig. 3 shows a rounded outer surface.
Referring to fig. 4 and 5, the threaded rod 3 is provided with an external thread 31 at a middle portion thereof, the external thread 31 is engaged with an internal thread on the first cylindrical surface 21 of the threaded sleeve 2 such that the threaded rod 3 is movable in the axial direction along the first cylindrical surface 21, one end of the threaded rod 3 is connected to a cylindrical connecting portion 32, and a plurality of L-shaped cantilevers 33 are connected to an end surface of the connecting portion 32. The diameter of the connecting portion 32 is greater than the diameter of the threaded rod 3, but preferably smaller than the diameter of the smallest clamping surface in the clamping sleeve 1. The other end of the threaded rod 3 is provided with a transverse through hole 34, through which hole 34 a hand lever 35 is passed to form a rotatable handle. A plurality of L-shaped cantilevers 33 are connected at equal intervals to the outer edge of the end face of the connecting portion 32. In this embodiment, the number of the L-shaped cantilevers is 3, which is the same as the number of the guide vane blades to be detached. The L-shaped cantilevers 33 comprise a vertical arm parallel to the axis of the threaded rod 3 and a transverse hook portion perpendicular to said vertical arm, the transverse hook portions on the three L-shaped cantilevers 33 extending in the same direction in the tangential direction of their rotation trajectory, the extension direction in the circumferential direction of the transverse hook portions being: so that when the threaded rod 3 is rotated to withdraw in the direction of the first cylinder, the guide vane blades are hooked to rotate synchronously with the threaded rod 3.
In the L shape cantilever, the diameter of horizontal hook portion's circumference orbit corresponds as being good with the scope within 3mm of the mid point of stator radial length, like this, can be so that the threaded rod exert force the point of action near the length mid point of stator blade to the stator, and the strength is exerted more steadily, if the point of application is close to the outer end of blade, the stationarity can reduce, but if be close to the root of leaf, then can be more hard, also can increase the vibration of blade and blade.
The extension length of the transverse hook part is equal to or more than the wall thickness of the guide vane within 3 mm. The other end of the threaded rod 3 is provided with a transverse through hole 34, through which hole 34 a hand lever 35 is passed to form a rotatable handle.
The first cylindrical surface 21, the second cylindrical surface 22, the first clamping surface 11, the second clamping surface 12 and the threaded rod 3 have the same axis, so that after the outer surface of the ventricular assist pump 4 is clamped, the threaded rod 3 and the casing 41 of the ventricular assist pump 4 have the same axis.
The diameter of the first clamping surface 11 of the clamping sleeve 1 is matched with the maximum cross section part of the ventricular assist pump 4, and the assist pump 4 is clamped by the first clamping surface and cannot rotate along with the first clamping surface when the guide vane is not detached any more.
The procedure for disassembling the guide vanes in the auxiliary pump 4 using the above-described disassembling device may be:
referring to fig. 6, fig. 7 and fig. 8, the outer surface and the inner structure of the axial flow type ventricular assist pump are respectively exemplarily shown, and based on the present invention, the guide vane detaching device for the axial flow type ventricular assist pump, the detaching method is:
step 1: screwing the threaded rod 3 into the threaded sleeve 2, wherein one end of the threaded rod extends out of the end part of one side of the first cylindrical surface 21, a hand lever 35 is arranged in the transverse through hole 34 on the extending end, and the other end of the threaded rod extends out of the end part of one side of the second cylindrical surface 22;
step 2: inserting the other end of the threaded rod 3 into the clamping sleeve 1 from the end part on one side of the first clamping surface 11, and extending the connecting part 32 on the threaded rod 3 and the L-shaped cantilever 33 on the threaded rod out of the clamping sleeve 1;
and step 3: the outer surface (for example, the thicker cylindrical surface in fig. 6) of the ventricular assist pump 4 is clamped by the first clamping surface 11, and the horizontal step 13 is abutted against an annular step between the thicker cylindrical section and the thinner cylindrical section of the axial flow ventricular assist pump, so that the axis of the casing 41 of the ventricular assist pump 4 is vertically fixed.
Inserting the L-shaped cantilever on the threaded rod 3 into a casing of a front guide vane of the axial-flow type ventricular assist pump, enabling the L-shaped cantilever on the connecting part to pass through the guide vane, and rotating the threaded rod forward to enable the L-shaped cantilever to be inserted deeper and enable the casing to be pressed into a first clamping surface of a clamping sleeve or the first clamping surface and enable the end surface of the casing to be pressed against a horizontal step of the clamping sleeve;
and 4, step 4: the threaded rod is rotated reversely until the transverse hook part of the L-shaped cantilever abuts against the lower end face of the corresponding front blade and the vertical arm abuts against the side wall of the front blade;
after the clamping is completed, the threaded rod 3 is rotated in the reverse direction.
And 5: the threaded rod 3 is continuously rotated in the reverse direction to enable the threaded rod to axially move and exit the casing 41, the guide vane 42 is driven to move outwards along the inner wall of the casing 41 in a rotating mode, the guide vane synchronously rotates along with the threaded rod and exits from the casing, and therefore smooth detachment of the guide vane is achieved.
Use the utility model provides a dismounting device takes out the stator from ventricle auxiliary pump 4, gets the stator, the very outstanding of advantage with tweezers clamp among the prior art.
The mode that the stator was dismantled to tradition utilization tweezers has a lot of defects, for example tweezers are by the wheel hub of cliping the stator hard pull out the stator violently, the tweezers that often appear the clamping-force insufficient and cause in this in-process break away from the stator and still need carry out the condition of secondary even a lot of clamping, the vibration that this in-process produced can shake the thrombus and fall, it is very big to the thrombus destruction on the pump body and the stator, influence observation effect, still often the circumstances that tweezers acted on the pulling force of stator and just can't dismantle out the stator with quick-witted casket interference fit's mating force can appear.
Based on the above structure of the utility model, dismantle the in-process at the stator, lean on withstanding the machine casket, come the reverse rotation threaded rod and pull out the stator, the phenomenon that whole in-process does not vibrate and drops produces, dismantles the in-process at the stator, and L shape cantilever 33 can not touch stator bearing or axle, has avoided the wearing and tearing to the thrombus of stator bearing or axle, and L shape cantilever 33 and stator are stood relatively simultaneously, so can not destroy the thrombus on the stator yet. The utility model relates to a horizontal hook portion designs into in L shape cantilever position on connecting portion: the diameter of the circumference orbit of the horizontal hook part is within +/-3 mm of the midpoint of the radial length of the guide vane, so that the vertical arm in the L-shaped cantilever supports against the middle part of the blade, and is more stable than the middle part which is close to the outside, the blade is not easy to deform, and if the vertical arm is close to the inside, the short operation of the force arm is difficult.
The utility model discloses to L shape cantilever horizontal hook portion extension length is injectd to be equal to or more than within the blade wall thickness 2-5mm of stator, preferably is greater than the blade wall thickness 3mm of stator. Such a structure is reasonable. If the horizontal hook part is too long, the horizontal hook part can easily collide with the blades when extending inwards through the intervals among the three blades from outside, so that vibration is caused, and even the horizontal hook part cannot extend into the blades. If the horizontal hook part is too short, the guide vane blade can fall off when the pulling-out force requirement is larger, because the surface of the guide vane blade in matched contact with the hook is generally arc-shaped, and the contact surface of the horizontal hook part and the blade is a plane, the structure is simple, the manufacture is convenient, the sliding between the horizontal hook part and the blade is realized, and the sliding is easy if the length is too short.
In another embodiment, as shown in fig. 10, the inner cavity of the clamping sleeve 1 may also be a straight cylinder, i.e. the first clamping surface and the second clamping surface have the same diameter, and the clamping of the outer surface of the ventricular assist pump 4 is achieved only by the cylinder sidewall.
The second cylindrical surface 22 of the threaded sleeve 2, which has a larger diameter than the first cylindrical surface, can accommodate vanes removed from the auxiliary pump 4.
In the embodiment shown in fig. 9, the threaded sleeve 2 may also be configured such that the diameter of the second cylindrical surface 22 is equal to the diameter of the first clamping surface 11. The second cylindrical surface 22 may also be threaded.
Correspondingly, the diameter of the connecting portion at the end of the threaded rod 3 is smaller than the inner diameter of the threaded sleeve 2, so that the guide vane hooked by the threaded rod 3 in the auxiliary pump 4 is pulled out of the clamping sleeve 1 into the threaded sleeve 2.
Of course, if the length of the clamping sleeve 1 is long enough, and the guide vane is in the clamping sleeve 1 in the whole process that the threaded rod 3 extends into the clamping sleeve to hook the guide vane and is detached, the diameter of the connecting part on the threaded rod 3 can be larger than the diameter of the second cylindrical surface 22 of the threaded sleeve 2.
It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "front", "rear", etc. indicating the directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The above description is the preferred embodiment of the present invention and the technical principle applied by the same, and for those skilled in the art, without departing from the spirit and scope of the present invention, any obvious changes such as equivalent transformation, simple replacement, etc. based on the technical solution of the present invention all belong to the protection scope of the present invention.
Claims (9)
1. A guide vane dismounting device for an axial flow type ventricular assist pump is characterized by comprising a clamping sleeve, a threaded sleeve and a threaded rod;
the inner cavity of the clamping sleeve is cylindrical and is provided with a first clamping surface and a second clamping surface, and the diameter of the first clamping surface is equal to or larger than that of the second clamping surface;
the inner cavity of the threaded sleeve is cylindrical and is provided with a first cylindrical surface and a second cylindrical surface along the axial direction, at least the first cylindrical surface is provided with internal threads, and the end surface of one side of the second cylindrical surface of the threaded sleeve is pressed on the end surface of one side of the second clamping surface on the clamping sleeve;
the middle part of the threaded rod is provided with external threads, one end of the threaded rod is connected with a connecting part, the end face of the connecting part is connected with a plurality of L-shaped cantilevers, and the length of the threaded rod is larger than the sum of the axial lengths of the clamping sleeve and the threaded sleeve, so that the threaded rod can be screwed into the threaded sleeve, penetrates through the inner cavity of the clamping sleeve and extends out of a port on one side of the first clamping face.
2. A vane release mechanism for an axial flow ventricular assist pump as claimed in claim 1, wherein the clamping sleeve has a first clamping face with a diameter greater than a second clamping face with a horizontal step therebetween; and/or the presence of a gas in the gas,
when the threaded sleeve is pressed on the clamping sleeve, the first cylindrical surface, the second clamping surface and the first clamping surface are communicated in sequence; or the like, or, alternatively,
the diameter of the second cylindrical surface of the threaded sleeve is larger than that of the first cylindrical surface, and the first cylindrical surface, the second clamping surface and the first clamping surface are communicated in sequence.
3. A vane release mechanism for an axial flow ventricular assist pump as claimed in claim 1, wherein the threaded rod is provided with a transverse through hole on the threaded rod extending out of the port on the side of the first cylindrical surface of the threaded sleeve, and a handle rod extends through the through hole as a handle.
4. A vane detaching device for an axial-flow ventricular assist pump according to claim 1 or 2, wherein a plurality of the L-shaped cantilevers are attached at equal intervals to an outer edge of the end surface of the attachment portion.
5. A vane detachment apparatus for an axial flow ventricular assist pump as claimed in claim 4, wherein the number of L-shaped cantilevers is 3.
6. A vane release mechanism for an axial flow ventricular assist pump according to claim 1, wherein the L-shaped cantilever includes a vertical arm parallel to the axis of the threaded rod and a lateral hook portion perpendicular to the vertical arm, the lateral hook portions on the plurality of L-shaped cantilevers extending in the same direction tangential to the rotational trajectory thereof.
7. A vane removal assembly for an axial flow ventricular assist pump as claimed in claim 6, wherein the diameter of the connection portion is greater than the diameter of the threaded rod; and/or the diameter of the circumferential trajectory of the crossbar portion may correspond to a range within ± 3mm of the midpoint of the radial length of the vane; and/or the extension length of the transverse hook part is equal to or more than 2-5mm of the wall thickness of the guide vane.
8. A vane dismounting device for an axial flow ventricular assist pump according to claim 1, wherein the diameter of the connection part is 0.5-0.7 times the diameter of the vane impeller.
9. A vane release mechanism for an axial flow ventricular assist pump as claimed in claim 2, wherein the first cylindrical surface, the second cylindrical surface, the first clamping surface, the second clamping surface, and the threaded rod have the same axis.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920964347.6U CN210819355U (en) | 2019-06-25 | 2019-06-25 | Guide vane dismounting device for axial flow type ventricular assist pump |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920964347.6U CN210819355U (en) | 2019-06-25 | 2019-06-25 | Guide vane dismounting device for axial flow type ventricular assist pump |
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| CN210819355U true CN210819355U (en) | 2020-06-23 |
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| CN201920964347.6U Active CN210819355U (en) | 2019-06-25 | 2019-06-25 | Guide vane dismounting device for axial flow type ventricular assist pump |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111318995A (en) * | 2019-06-25 | 2020-06-23 | 中国医学科学院阜外医院 | Guide vane dismounting device and method for axial flow type ventricular assist pump |
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- 2019-06-25 CN CN201920964347.6U patent/CN210819355U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111318995A (en) * | 2019-06-25 | 2020-06-23 | 中国医学科学院阜外医院 | Guide vane dismounting device and method for axial flow type ventricular assist pump |
| CN111318995B (en) * | 2019-06-25 | 2024-03-19 | 中国医学科学院阜外医院 | Guide vane dismounting device and method for axial flow type ventricular assist pump |
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