Welding auxiliary tool

Abstract

The auxiliary welding tool is accurate in positioning and simple in structure and comprises a base used for being connected with a blood inlet cage in a sleeved mode, a concave portion is formed in the top of the base, the shape of the concave portion is matched with the hemispherical shape of a water dropper, a long shaft is arranged at the geometric center of the concave portion in a protruding and extending mode, and the long shaft coincides with the axis of the base. When in use, the blood inlet cage is sleeved on the base and is positioned, the inner hole of the water dropper penetrates through the long shaft, the ball head of the water dropper is arranged in the concave part and is positioned, the end part of the support column of the blood inlet cage naturally abuts against the peripheral surface of the ball head of the water dropper at the moment, then welding is performed, and the welding parts of each water dropper and the support column are the same. Therefore, the welding size of the product is always in an allowable tolerance range, and the product percent of pass is high.

Description

Technical Field

[0001] The utility model relates to the technical field of catheter pump manufacturing, in particular to a welding auxiliary tool. Background Art

[0002] The catheter pump can support the patient's heart function and provide hemodynamic support for cardiogenic shock or acute heart failure in short-term applications (a few days or weeks) or long-term applications (a few weeks or months). The blood inflow cage serves as the blood inlet of the catheter pump, and its structure is as follows Figure 1 As shown, it includes a circular tubular blood inlet cage 1, a blood inlet port is opened on the peripheral wall of the blood inlet cage 1, a water drop head 2 is connected to the distal end of the blood inlet cage 1, and the blood inlet cage 1 and the water drop head 2 are welded and fixed, so the positioning accuracy between the blood inlet cage 1 and the water drop head 2 determines the welding quality of the entire blood inlet cage. Utility Model Content

[0003] The utility model aims to provide a welding auxiliary tool with accurate positioning and simple structure.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a welding auxiliary tool, including a base for being sleeved into a blood cage, a recess is provided on the top of the base, the shape of the recess is consistent with the hemispherical shape of the water drop head, and a long axis is protruding from the geometric center of the recess, and the long axis coincides with the axis of the base.

[0005] A countersunk hole is arranged at the geometric center of the concave portion, and the long axis protrudes from the center of the countersunk hole to the outside of the concave portion.

[0006] The depth of the concave portion is smaller than the diameter of the hemisphere of the water drop head.

[0007] The upper section of the base is a sleeve section that matches the inner diameter of the blood inlet cage, the diameter of the support section of the lower section of the base is larger than the inner diameter of the blood inlet cage, and a limiting step is formed at the connection position of the sleeve section and the support section.

[0008] The sleeve section is a variable diameter structure, including a large diameter section at the bottom and a small diameter section at the top. The outer diameter of the large diameter section is equal to the inner diameter of the blood inlet cage, and the outer diameter of the small diameter section is smaller than the inner diameter of the blood inlet cage.

[0009] In the above scheme, when in use, first put the blood inlet cage on the base and position it, then pass the inner hole of the water drop head through the long axis, place the ball head of the water drop head in the recess and position it, at this time, the support end of the blood inlet cage naturally abuts against the outer peripheral surface of the ball head of the water drop head, and then welding is performed. The welding position of each water drop head and the support is the same, thereby ensuring that the welding size of the product is always within the allowable tolerance range and the product qualification rate is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the structure of blood flowing into the cage;

[0011] Figure 2 The three-dimensional diagram of the welding auxiliary equipment;

[0012] Figure 3 This is a cross-sectional view of the welding aid. DETAILED DESCRIPTION

[0013] Combine the following Figure 1-Figure 3 The utility model is further described in detail.

[0014] A welding auxiliary tool includes a base 10 for sleeved blood inlet cage 1, a recess 11 is provided on the top of the base 10, the shape of the recess 11 matches the hemispherical shape of the water drop head 2, and a long axis 12 is protruded from the geometric center of the recess 11, and the long axis 12 coincides with the axis of the base 10. When in use, the blood inlet cage 1 is first sleeved on the base 10 and positioned, and then the inner hole of the water drop head 2 is passed through the long axis 12, and the ball head of the water drop head 2 is placed in the recess 11 and positioned. At this time, the end of the pillar of the blood inlet cage 1 naturally abuts against the outer peripheral surface of the ball head of the water drop head 2, and then welding is performed. The welding position of each water drop head 2 and the pillar is the same, thereby ensuring that the welding size of the product is always within the allowable tolerance range, and the product qualification rate is high.

[0015] Furthermore, a countersunk hole 13 is provided at the geometric center of the recess 11, and the long axis 12 protrudes from the center of the countersunk hole 13 to the outside of the recess 11. The setting of the countersunk hole 13, on the one hand, the hole edge of the countersunk hole 13 abuts against the hemisphere, which can prevent the water drop head 2 from rotating during the welding process, and on the other hand, it is also conducive to the setting of the long axis 12. The precise anti-rotation operation of the water drop head 2 is to insert the O-ring from the long axis 12 after the blood cage 1 and the water drop head 2 are assembled, and the O-ring abuts against the water drop head 2, and the friction of the O-ring prevents the water drop head 2 from rotating and moving forward and backward.

[0016] In order to ensure that the welding position with the support of the blood inlet cage 1 is exposed, the depth of the recess 11 is smaller than the diameter of the hemisphere of the water drop head 2, so that the welding position with the support of the blood inlet cage 1 is located outside the recess 11, leaving space for welding operation.

[0017] The upper section of the base 10 is a sleeve section 14 that matches the inner diameter of the blood inlet cage 1. The diameter of the support section 15 of the lower section of the base 10 is larger than the inner diameter of the blood inlet cage 1. A limiting step 16 is formed at the connection position of the sleeve section 14 and the support section 15. When the end of the blood inlet cage 1 abuts against the limiting step 16, the axial position of the blood inlet cage 1 is limited.

[0018] In order to facilitate the insertion and removal of the blood inlet cage 1, the insertion section 14 is a variable diameter structure, including a large diameter section 141 at the bottom and a small diameter section 142 at the top. The outer diameter of the large diameter section 141 is equal to the inner diameter of the blood inlet cage 1, and the outer diameter of the small diameter section 142 is smaller than the inner diameter of the blood inlet cage 1.

Claims

1. A welding auxiliary tool, characterized in that: The invention comprises a base (10) for being sleeved into a blood cage (1), a recess (11) being provided at the top of the base (10), the shape of the recess (11) being consistent with the hemispherical shape of the water drop head (2), a long axis (12) being provided protruding from the geometric center of the recess (11), and the long axis (12) being coincident with the axis of the base (10).

2. The welding auxiliary tool according to claim 1, characterized in that: A countersunk hole (13) is provided at the geometric center of the recess (11), and the long axis (12) protrudes from the center of the countersunk hole (13) to the outside of the recess (11).

3. The welding auxiliary tool according to claim 1, characterized in that: The depth of the concave portion (11) is smaller than the diameter of the hemisphere of the water drop head (2).

4. The welding auxiliary tool according to claim 1, characterized in that: The upper section of the base (10) is a sleeve section (14) that matches the inner diameter of the blood inlet cage (1), the support section (15) of the lower section of the base (10) has a diameter greater than the inner diameter of the blood inlet cage (1), and a limiting step (16) is formed at the connection position between the sleeve section (14) and the support section (15).

5. The welding auxiliary tool according to claim 4, characterized in that: The sleeve section (14) is a variable diameter structure, comprising a large diameter section (141) at the bottom and a small diameter section (142) at the top, wherein the outer diameter of the large diameter section (141) is equal to the inner diameter of the blood inlet cage (1), and the outer diameter of the small diameter section (142) is smaller than the inner diameter of the blood inlet cage (1).

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