CN217311531U - Catheter mandrel - Google Patents

Abstract

The utility model provides a pipe dabber, including middle dabber, first locating pin, the second locating pin and round the first outside dabber that middle dabber circumference set up, the second outside dabber, third outside dabber and fourth outside dabber, first outside dabber sets up along the radial direction of pipe dabber with the second outside dabber relatively, the third outside dabber sets up along the radial direction of pipe dabber with the fourth outside dabber relatively, first outside dabber, second outside dabber and middle dabber are equipped with first locating hole, first locating pin is installed in first locating hole dismantled and assembled, the third outside dabber, fourth outside dabber and middle dabber are equipped with the second locating hole, the second locating pin is installed in the second locating hole dismantled and assembled. The utility model provides a pipe dabber can effectively reduce the disability rate, promotes the product percent of pass.

Description

Catheter mandrel

Technical Field

The application relates to the technical field of medical equipment, in particular to a catheter mandrel.

Background

During the vascular intervention operation, the catheter is often required to move along the guiding structure to reach the lesion at the far end of the blood vessel so as to establish a diagnosis and treatment path. In order to keep the inner diameter of the catheter stable, a core shaft is used for being sleeved in the catheter before the catheter is formed, and after the heat shrinkage process is completed, a core pulling process is carried out, namely the core shaft is pulled out of the catheter after the heat shrinkage process.

The existing stainless steel mandrel adopts an integrated solid stainless steel mandrel, after a heat shrinkage process of a conduit product is completed, the core pulling process is difficult to perform due to the fact that the combination is too tight and the friction force is large in the core pulling process, and the mandrel cannot be pulled out through a manual core pulling process or core pulling equipment. And adopt the condition that equipment of loosing core can appear skidding, can't take out the dabber, lead to the product to scrap, also can lead to equipment to damage.

SUMMERY OF THE UTILITY MODEL

For the above-mentioned defect that exists among the solution prior art, the pipe dabber that this application provided can effectively reduce the disability rate, promotes the product percent of pass.

The utility model provides a pipe dabber, including middle dabber, first locating pin, the second locating pin and round the first outside dabber that middle dabber circumference set up, the second outside dabber, third outside dabber and fourth outside dabber, first outside dabber sets up along the radial direction of pipe dabber with the second outside dabber relatively, the third outside dabber sets up along the radial direction of pipe dabber with the fourth outside dabber relatively, first outside dabber, second outside dabber and middle dabber are equipped with first locating hole, first locating pin is installed in first locating hole dismantled and assembled, the third outside dabber, fourth outside dabber and middle dabber are equipped with the second locating hole, the second locating pin is installed in the second locating hole dismantled and assembled.

Optionally, the catheter mandrel includes a first end and a second end disposed opposite each other, the first positioning hole is disposed proximate to the first end, and the second positioning hole is disposed proximate to the second end.

Optionally, the first outer mandrel, the second outer mandrel and the middle mandrel are provided with a third positioning hole, the third outer mandrel, the fourth outer mandrel and the middle mandrel are provided with a fourth positioning hole, the third positioning hole is disposed near the second end, the fourth positioning hole is disposed near the first end, the catheter mandrel further includes a third positioning pin and a fourth positioning pin, the third positioning pin is detachably mounted in the third positioning hole, and the fourth positioning pin is detachably mounted in the fourth positioning hole.

Optionally, the axes of the first positioning hole, the second positioning hole, the third positioning hole and the fourth positioning hole are all perpendicular to the axis of the catheter mandrel.

Optionally, the catheter mandrel is cylindrical.

Optionally, the first external mandrel includes a first arc surface, the second external mandrel includes a second arc surface, the third external mandrel includes a third arc surface, the fourth external mandrel includes a fourth arc surface, and the first arc surface, the second arc surface, the third arc surface, and the fourth arc surface are spliced to form a cylindrical surface.

Optionally, the area of the first arc surface is equal to the area of the second arc surface, the area of the third arc surface is equal to the area of the fourth arc surface, and the area of the first arc surface is greater than the area of the third arc surface.

Optionally, the first outer mandrel further comprises a first inner surface, the second outer mandrel further comprises a second inner surface, and the third outer mandrel and the fourth outer mandrel are located between the first inner surface and the second inner surface.

Optionally, the third outer mandrel further comprises a third inner surface, a fourth inner surface, and a fifth inner surface, the third inner surface being parallel to and disposed opposite the fourth inner surface, the fifth inner surface being perpendicularly connected to the third inner surface and the fourth inner surface, the third inner surface being in contact with the first inner surface, the fourth inner surface being in contact with the second inner surface;

the fourth external mandrel further comprises a sixth inner surface, a seventh inner surface, and an eighth inner surface, the sixth inner surface and the seventh inner surface being parallel and opposing, the eighth inner surface being perpendicularly connected to the sixth inner surface and the seventh inner surface, the sixth inner surface being in contact with the first inner surface, the seventh inner surface being in contact with the second inner surface.

Optionally, the intermediate mandrel is rectangular in cross-section.

The utility model provides a pipe dabber is used for keeping the pipe internal diameter stable before the pipe shaping, after the cover establishes the pipe on the pipe dabber and accomplishes pyrocondensation technology, can dismantle first locating pin and second locating pin, later with middle dabber from first outside dabber, the second outside dabber, take out between third outside dabber and the fourth outside dabber, the size of pipe dabber reduces this moment, can reduce the frictional force between pipe and the pipe dabber, conveniently take out first outside dabber, the second outside dabber, third outside dabber and fourth outside dabber from the pipe, avoid taking out the disability rate that produces because of the technology of loosing core, can effectively reduce the disability rate, promote the product percent of pass.

Drawings

FIG. 1 is a perspective view of a catheter mandrel of the present application;

FIG. 2 is a schematic cross-sectional structural view of a catheter mandrel of the present application;

FIG. 3 is a schematic structural view of the first or second outer mandrels of the present application;

FIG. 4 is a schematic structural view of a third or fourth external mandrel of the present application;

FIG. 5 is a schematic structural view of an intermediate mandrel of the present application;

FIG. 6 is a schematic structural view of a first alignment pin of the present application;

fig. 7 to 11 are schematic views illustrating a core pulling process performed on the catheter mandrel of the present application.

Detailed Description

The following description of the embodiments of the present application is provided for illustrative purposes, and other advantages and capabilities of the present application will become apparent to those skilled in the art from the present disclosure.

In the following description, reference is made to the accompanying drawings that describe several embodiments of the application. It is to be understood that other embodiments may be utilized and that mechanical, structural, electrical, and operational changes may be made without departing from the spirit and scope of the present application. The following detailed description is not to be taken in a limiting sense, and the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

Although the terms first, second, etc. may be used herein to describe various elements in some instances, these elements should not be limited by these terms. These terms are only used to distinguish one element from another.

Also, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes" and/or "including," when used in this specification, specify the presence of stated features, steps, operations, elements, components, items, species, and/or groups, but do not preclude the presence, or addition of one or more other features, steps, operations, elements, components, items, species, and/or groups thereof. The terms "or" and/or "as used herein are to be construed as inclusive or meaning any one or any combination. Thus, "A, B or C" or "A, B and/or C" means "any of the following: a; b; c; a and B; a and C; b and C; A. b and C ". An exception to this definition will occur only when a combination of elements, functions, steps or operations are inherently mutually exclusive in some way.

Fig. 1 is a perspective view and fig. 2 is a cross-sectional view of a catheter core shaft of the present application, and as shown in fig. 1 and fig. 2, a catheter core shaft 10 includes a middle core shaft 11, a first positioning pin 12, a second positioning pin 13, and a first outer core shaft 16, a second outer core shaft 17, a third outer core shaft 18, and a fourth outer core shaft 19 disposed circumferentially around the middle core shaft 11, the first outer core shaft 16 and the second outer core shaft 17 are disposed opposite to each other in a radial direction of the catheter core shaft 10, the third outer core shaft 18 and the fourth outer core shaft 19 are disposed opposite to each other in a radial direction of the catheter core shaft 10, the first outer core shaft 16, the second outer core shaft 17, and the middle core shaft 11 are provided with a first positioning hole 101, the first positioning pin 12 is detachably mounted in the first positioning hole 101, the third outer core shaft 18, the fourth outer core shaft 19, and the middle core shaft 11 are provided with a second positioning hole 102, the second positioning pin 13 is detachably mounted in the second positioning hole 102. As shown in fig. 1, catheter mandrel 10 includes oppositely disposed first and second ends 10a, 10 b. In this embodiment, the first positioning pin 12 may be disposed at the first end portion 10a or the second end portion 10b, and the second positioning pin 13 may be disposed at the first end portion 10a or the second end portion 10 b.

The catheter mandrel 10 is used for keeping the inner diameter of a catheter 20 stable before the catheter 20 is formed (refer to fig. 7 to 11), when the catheter 20 sleeved on the catheter mandrel 10 completes a heat shrinkage process, a first positioning pin 12 and a second positioning pin 13 can be detached, then the middle mandrel 11 is pulled out from among a first external mandrel 16, a second external mandrel 17, a third external mandrel 18 and a fourth external mandrel 19, at the moment, the size of the catheter mandrel 10 is reduced, the friction force between the catheter 20 and the catheter mandrel 10 can be reduced, the first external mandrel 16, the second external mandrel 17, the third external mandrel 18 and the fourth external mandrel 19 can be conveniently pulled out from the catheter 20, the rejection rate caused by the fact that the mandrels cannot be pulled out by a core pulling process is avoided, the effective reduction of the rejection rate is achieved, and the product percent of pass is improved.

Alternatively, as shown in fig. 1, the first positioning hole 101 is disposed near the first end portion 10a, and the second positioning hole 102 is disposed near the second end portion 10 b. In the present embodiment, the first positioning hole 101 penetrates through the first outer spindle 16, the second outer spindle 17 and the intermediate spindle 11, the second positioning hole 102 penetrates through the third outer spindle 18, the fourth outer spindle 19 and the intermediate spindle 11, and when the first positioning pin 12 is installed in the first positioning hole 101, the first positioning pin 12 can assemble the first outer spindle 16, the second outer spindle 17 and the intermediate spindle 11 together; when the second positioning pin 13 is fitted in the second positioning hole 102, the second positioning pin 13 can fit the third outer spindle 18, the fourth outer spindle 19, and the intermediate spindle 11 together.

Alternatively, as shown in fig. 1, the first outer mandrel 16, the second outer mandrel 17 and the middle mandrel 11 are provided with a third positioning hole 103, the third outer mandrel 18, the fourth outer mandrel 19 and the middle mandrel 11 are provided with a fourth positioning hole 104, the third positioning hole 103 is disposed near the second end 10b, the fourth positioning hole 104 is disposed near the first end 10a, the catheter mandrel 10 further comprises a third positioning pin 14 and a fourth positioning pin 15, the third positioning pin 14 is removably mounted in the third positioning hole 103, and the fourth positioning pin 15 is removably mounted in the fourth positioning hole 104. In the present embodiment, the axis of the first positioning hole 101 is parallel to the axis of the third positioning hole 103, and the axis of the second positioning hole 102 is parallel to the axis of the fourth positioning hole 104.

Optionally, the axes of the first positioning hole 101, the second positioning hole 102, the third positioning hole 103 and the fourth positioning hole 104 are all perpendicular to the axis of the catheter mandrel 10.

Optionally, the first positioning hole 101 and the fourth positioning hole 104 are staggered from each other; the second positioning hole 102 and the third positioning hole 103 are staggered.

Optionally, the end surface distance of the first positioning pin 12 compared with the first end portion 10a is 3mm to 8mm, preferably 4mm, 5mm, 6 mm; the end surface distance of the fourth positioning pin 15 from the first end 10a is 8mm to 12mm, preferably 9mm, 10mm, 11 mm.

Optionally, the end surface distance of the second positioning pin 13 compared with the second end 10b is 3mm to 8mm, preferably 4mm, 5mm, 6 mm; the distance between the end surface of the third positioning pin 14 and the second end 10b is 8mm to 12mm, preferably 9mm, 10mm, 11 mm.

Optionally, the material of the middle mandrel 11, the first positioning pin 12, the second positioning pin 13, the third positioning pin 14, the fourth positioning pin 15, the first outer mandrel 16, the second outer mandrel 17, the third outer mandrel 18 and the fourth outer mandrel 19 is stainless steel.

Alternatively, as shown in fig. 1 and 2, the catheter mandrel 10 is cylindrical.

Optionally, fig. 3 is a schematic structural view of a first external mandrel or a second external mandrel of the present application, and fig. 4 is a schematic structural view of a third external mandrel or a fourth external mandrel of the present application, as shown in fig. 2, fig. 3, and fig. 4, the first external mandrel 16 includes a first arc surface 161, the second external mandrel 17 includes a second arc surface 171, the third external mandrel 18 includes a third arc surface 181, the fourth external mandrel 19 includes a fourth arc surface 191, and the first arc surface 161, the second arc surface 171, the third arc surface 181, and the fourth arc surface 191 are spliced to form a cylindrical surface. In the present embodiment, the arc degree of the first arc surface 161 is equal to the arc degree of the second arc surface 171, and the arc degree of the third arc surface 181 is equal to the arc degree of the fourth arc surface 191.

Optionally, the area of the first arc surface 161 is equal to the area of the second arc surface 171, the area of the third arc surface 181 is equal to the area of the fourth arc surface 191, and the area of the first arc surface 161 is larger than the area of the third arc surface 181.

Optionally, the first outer mandrel 16 further comprises a first inner surface 162, the second outer mandrel 17 further comprises a second inner surface 172, and the third outer mandrel 18 and the fourth outer mandrel 19 are located between the first inner surface 162 and the second inner surface 172. In the present embodiment, the shape of the first outer mandrel 16 is the same as the shape of the second outer mandrel 17, and the shape of the third outer mandrel 18 is the same as the shape of the fourth outer mandrel 19.

Optionally, as shown in fig. 2, the third outer mandrel 18 further includes a third inner surface 182, a fourth inner surface 183, and a fifth inner surface 184, the third inner surface 182 being parallel to and disposed opposite the fourth inner surface 183, the fifth inner surface 184 being perpendicularly connected to the third inner surface 182 and the fourth inner surface 183, the third inner surface 182 being in contact with the first inner surface 162, the fourth inner surface 183 being in contact with the second inner surface 172, and the fifth inner surface 184 being in contact with the intermediate mandrel 11;

the fourth outer spindle 19 further includes a sixth inner surface 192, a seventh inner surface 193, and an eighth inner surface 194, the sixth inner surface 192 being disposed parallel to and opposite the seventh inner surface 193, the eighth inner surface 194 being connected perpendicular to the sixth inner surface 192 and the seventh inner surface 193, the sixth inner surface 192 being in contact with the first inner surface 162, the seventh inner surface 193 being in contact with the second inner surface 172, and the eighth inner surface 194 being in contact with the intermediate spindle 11.

Alternatively, fig. 5 is a schematic structural view of the intermediate mandrel of the present application, and as shown in fig. 2 and 5, the section of the intermediate mandrel 11 is rectangular.

Alternatively, fig. 6 is a schematic structural diagram of the first positioning pin of the present application, and as shown in fig. 6, the first positioning pin 12, the second positioning pin 13, the third positioning pin 14, and the fourth positioning pin 15 are all cylindrical

Optionally, fig. 7 to 11 are schematic flow diagrams of a core pulling process performed on the catheter mandrel of the present application, please refer to fig. 7 to 11, where the core pulling process includes:

step one, assembling the intermediate mandrel 11, the first external mandrel 16, the second external mandrel 17, the third external mandrel 18 and the fourth external mandrel 19 into the catheter mandrel 10 by using the first positioning pin 12 and the second positioning pin 13 or the first positioning pin 12, the second positioning pin 13, the third positioning pin 14 and the fourth positioning pin 15.

Step two, the catheter 20 is sleeved on the catheter mandrel 10, and the catheter 20 is subjected to heat shrinkage treatment.

Step three, after the heat shrinking process is completed, the first positioning pin 12 and the second positioning pin 13 or the first positioning pin 12, the second positioning pin 13, the third positioning pin 14 and the fourth positioning pin 15 are detached from the catheter mandrel 10, as shown in fig. 7.

Step four, the intermediate mandrel 11 is withdrawn from between the first outer mandrel 16, the second outer mandrel 17, the third outer mandrel 18 and the fourth outer mandrel 19, as shown in fig. 8.

Step five, the third outer mandrel 18 and the fourth outer mandrel 19 are pressed inward, and then the third outer mandrel 18 and the fourth outer mandrel 19 are drawn out from between the first outer mandrel 16 and the second outer mandrel 17, as shown in fig. 9 and 10.

Step six, the first outer mandrel 16 and the second outer mandrel 17 are extracted, and the catheter 20 after the heat shrinkage treatment is retained, as shown in fig. 11.

The above embodiments are merely illustrative of the principles and utilities of the present application and are not intended to limit the present application. Any person skilled in the art can modify or change the above-described embodiments without departing from the spirit and scope of the present application. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical concepts disclosed in the present application shall be covered by the claims of the present application.

Claims (10)

1. A catheter mandrel is characterized by comprising a middle mandrel, a first positioning pin, a second positioning pin, a first external mandrel, a second external mandrel, a third external mandrel and a fourth external mandrel, wherein the first external mandrel, the second external mandrel, the third external mandrel and the fourth external mandrel are arranged around the middle mandrel in the circumferential direction, the first outer mandrel and the second outer mandrel are oppositely arranged along the radial direction of the catheter mandrel, the third outer mandrel is disposed opposite the fourth outer mandrel in a radial direction of the catheter mandrel, the first external mandrel, the second external mandrel and the middle mandrel are provided with first positioning holes, the first positioning pin is detachably mounted in the first positioning hole, the third external mandrel, the fourth external mandrel and the middle mandrel are provided with second positioning holes, and the second positioning pin is detachably mounted in the second positioning holes.

2. The catheter mandrel of claim 1 wherein said catheter mandrel comprises first and second oppositely disposed ends, said first positioning hole being disposed proximate said first end and said second positioning hole being disposed proximate said second end.

3. The catheter mandrel of claim 2 wherein said first outer mandrel, said second outer mandrel and said intermediate mandrel are provided with a third locating hole, said third outer mandrel, said fourth outer mandrel and said intermediate mandrel are provided with a fourth locating hole, said third locating hole is disposed proximate said second end, said fourth locating hole is disposed proximate said first end, said catheter mandrel further comprising a third locating pin and a fourth locating pin, said third locating pin removably mountable in said third locating hole, said fourth locating pin removably mountable in said fourth locating hole.

4. The catheter mandrel of claim 3 wherein the axes of the first locating hole, the second locating hole, the third locating hole, and the fourth locating hole are all perpendicular to the axis of the catheter mandrel.

5. The catheter mandrel of any one of claims 1 to 4 wherein said catheter mandrel is cylindrical.

6. The catheter mandrel of claim 5 wherein the first outer mandrel comprises a first arc surface, the second outer mandrel comprises a second arc surface, the third outer mandrel comprises a third arc surface, the fourth outer mandrel comprises a fourth arc surface, and the first arc surface, the second arc surface, the third arc surface, and the fourth arc surface are spliced into a cylindrical surface.

7. The catheter mandrel of claim 6 wherein the first arcuate surface has an area equal to the area of the second arcuate surface, the third arcuate surface has an area equal to the area of the fourth arcuate surface, and the area of the first arcuate surface is greater than the area of the third arcuate surface.

8. The catheter mandrel of claim 6 wherein said first outer mandrel further comprises a first inner surface, said second outer mandrel further comprises a second inner surface, said third outer mandrel and said fourth outer mandrel being positioned between said first inner surface and said second inner surface.

9. The catheter mandrel of claim 8 wherein said third outer mandrel further comprises a third inner surface, a fourth inner surface, and a fifth inner surface, said third inner surface being parallel to and disposed opposite said fourth inner surface, said fifth inner surface being perpendicularly connected to said third inner surface and said fourth inner surface, said third inner surface being in contact with said first inner surface, said fourth inner surface being in contact with said second inner surface;

the fourth external mandrel further comprises a sixth inner surface, a seventh inner surface, and an eighth inner surface, the sixth inner surface and the seventh inner surface being parallel and opposing, the eighth inner surface being perpendicularly connected to the sixth inner surface and the seventh inner surface, the sixth inner surface being in contact with the first inner surface, the seventh inner surface being in contact with the second inner surface.

10. The catheter mandrel of claim 9 wherein said intermediate mandrel is rectangular in cross-section.

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