Medical tubular polymer fabric shaping mechanism and shaping method

Abstract

The invention provides a medical tubular polymer fabric shaping mechanism which is characterized in that a plurality of through holes are uniformly formed in the pipe wall of a placement pipe in the circumferential direction and form a group, a plurality of groups of through holes are formed in the placement pipe in the axial direction, an inner hose is arranged in the placement pipe, and a plurality of shaping assemblies are arranged on the placement pipe; each shaping assembly comprises a connecting rod, a shaping block, a fixing block and an elastic piece, the connecting rod is inserted into the through hole in a sliding mode, the shaping block is arranged at one end of the connecting rod, the fixing block is arranged at the other end of the connecting rod, the two opening assemblies are oppositely arranged in the inner hose in a sliding mode, each opening assembly comprises an opening block and a control rod, and the control rod is connected with the opening block. The diameter of the middle of the opening block is larger than that of the inner hose, and one end of the control rod is connected with the opening block. According to the tubular polymer fabric shaping device, manual operation during tubular polymer fabric opening can be reduced, so that the problem that the appearance of the tubular polymer fabric is damaged due to excessive force can be avoided, and the success rate of tubular polymer fabric shaping is increased.

Description

Technical Field

[0001] The invention relates to the technical field of medical polymer fabrics, in particular to a shaping mechanism and a shaping method for medical tubular polymer fabrics. Background Art

[0002] One-piece braided polymer tubes are widely used in medical devices, such as stent graft systems for treating aortic dissections or artificial blood vessels used in aortic arch replacements. Traditional medical polymer tubular fabrics are made by stitching flat fabrics together, which can easily cause bleeding at the sutures, making the sutures unsightly, and the process is complex and inefficient. In contrast, the existing technology often uses medical polymer tubular fabrics that are interwoven with yarns to form an integral shape. These medical polymer tubular fabrics can be customized to different diameters and lengths, and can accommodate blood vessels of varying thicknesses without the need for suturing, thereby greatly improving production efficiency and product diversity.

[0003] However, existing medical polymer tubular fabrics are flattened during weaving and must be stretched to better support blood vessels. However, because these fabrics are made of interwoven yarns, they are inherently soft and can form dead folds and holes with even the slightest external pressure, affecting the compliance and leakage of blood vessels. Therefore, existing technologies have certain limitations. Summary of the Invention

[0004] The present invention is made to solve the above problems and aims to provide a shaping mechanism and shaping method for medical tubular polymer fabrics.

[0005] The present invention provides a medical tubular polymer fabric shaping mechanism, which has the following characteristics: the placement tube is in a circular tube shape, a plurality of through holes are uniformly opened on the tube wall of the placement tube along the circumference, and the plurality of through holes form a group; the placement tube is provided with multiple groups of through holes along the axial direction thereof,

[0006] The inner hose is in the shape of a circular tube and is arranged in the placement tube. The length of the inner hose is not less than the length of the placement tube.

[0007] A plurality of shaping components are arranged on the placement tube, and each shaping component includes a connecting rod, a shaping block, a fixing block and an elastic member. The connecting rod can be slidably inserted into the through hole. The shaping block and the fixing block are both in the shape of an arc plate. The shaping block is arranged on one end of the connecting rod, and the fixing block is arranged on the other end of the connecting rod. The elastic member is sleeved on the connecting rod, and one end of the elastic member is connected to the fixing block, and the other end is connected to the inner wall of the placement tube.

[0008] The two expansion components are relatively slidably arranged in the inner hose. Each expansion component includes an expansion block and a control rod. The two ends of the expansion block are sliding parts, and the middle is an expansion part. The sliding part is in the shape of a spherical cone, and the expansion part is in the shape of a cylinder. The diameter of the expansion part is larger than the diameter of the inner hose. One end of the control rod is connected to the expansion block, and the other end is always located outside the inner hose.

[0009] Among them, the shaping blocks on one end of the multiple connecting rods inserted in the same group of through holes can form a first circular ring, the inner wall of the first circular ring fits with the outer wall of the placement tube, and the fixing blocks on the other end of the multiple connecting rods inserted in the same group of through holes can form a second circular ring, the inner wall of the second circular ring fits with the outer wall of the inner hose.

[0010] The medical tubular polymer fabric shaping mechanism provided by the present invention can also have the following feature: the length of the placement tube is not less than the length of the tubular polymer fabric.

[0011] The medical tubular polymer fabric shaping mechanism provided by the present invention can also have the following characteristics: the inner hose is made of a material that is flexible and can undergo elastic deformation.

[0012] The medical tubular polymer fabric shaping mechanism provided by the present invention can also have the following feature: the shaping block is made of a material having the property of thermal expansion and contraction.

[0013] The medical tubular polymer fabric shaping mechanism provided by the present invention can also have the following feature: the length of the expansion portion is not greater than the lengths of the shaping block and the fixing block.

[0014] The medical tubular polymer fabric shaping mechanism provided by the present invention can also have the following feature: the difference between the diameter of the expansion portion and the diameter of the inner hose is smaller than the thickness of the shaping block.

[0015] The medical tubular polymer fabric shaping mechanism provided by the present invention may further have the following feature: the diameter of the first ring is 0 to 0.2 mm larger than the diameter of the tubular polymer fabric.

[0016] The present invention also provides a shaping method for a medical tubular polymer fabric, which is applicable to any of the above-mentioned shaping mechanisms for a medical tubular polymer fabric and has the following characteristics, comprising the following steps:

[0017] S1. Putting the tubular polymer fabric to be shaped on multiple sets of shaping blocks to initially expand the tubular polymer fabric;

[0018] S2. Push the control rod to move the expansion block into the inner hose until the two sets of shaping blocks closest to the tubular polymer fabric and located on both sides thereof protrude, thereby limiting and fixing the tubular polymer fabric;

[0019] S3, placing the tubular polymer fabric after being limited and fixed in hot water at 70℃~95℃ for 5~10 minutes and then taking it out. During this process, the shaping block will expand due to the heat and thus stretch the tubular polymer fabric again;

[0020] S4, placing the tubular polymer fabric in cold water at 4°C to 10°C for 5 to 10 minutes. During this process, the tubular polymer fabric is shaped by the cold, and the shaping block shrinks by the cold, making it easier to remove the tubular polymer fabric later.

[0021] S5. Pull out the control rod to move the expansion block outward from the inner hose until the two sets of shaping blocks closest to the tubular polymer fabric and located on both sides thereof retract. Finally, remove the tubular polymer fabric and dry it to complete the shaping.

[0022] Functions and effects of the invention

[0023] The medical tubular polymer fabric shaping mechanism and shaping method according to the present invention can reduce manual operation when expanding the tubular polymer fabric, thereby avoiding the problem of damage to the fabric appearance due to poor control of force when expanding the tubular polymer fabric, thereby improving the success rate of tubular polymer fabric shaping and indirectly reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a cross-sectional schematic diagram of a shaping mechanism for a medical tubular polymer fabric according to the present invention;

[0025] Figure 2 The present invention is a schematic flow chart of a method for shaping a medical tubular polymer fabric.

[0026] Description of reference numerals:

[0027] 10. Placement tube; 11. Through hole; 20. Inner hose; 30. Shaping assembly; 31. Connecting rod; 32. Shaping block; 33. Fixing block; 34. Elastic member; 40. Spreading assembly; 41. Spreading block; 411. Sliding portion; 412. Spreading portion; 42. Control rod. DETAILED DESCRIPTION

[0028] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is described in detail in the following embodiments with reference to the accompanying drawings.

[0029] Example

[0030] Figure 1 The present invention is a schematic cross-sectional view of a medical tubular polymer fabric shaping mechanism.

[0031] like Figure 1As shown, this embodiment provides a medical tubular polymer fabric shaping mechanism, comprising: a placement tube 10 , an inner hose 20 , a plurality of shaping components, and two expansion components 40 .

[0032] like Figure 1 As shown, the placement tube 10 is in a circular tube shape, and a plurality of through holes 11 are uniformly opened on the tube wall of the placement tube 10 along the circumference. A plurality of through holes 11 form a group, and a plurality of groups of through holes 11 are also provided on the placement tube 10 along its axial direction. The length of the placement tube 10 is not less than the length of the tubular polymer fabric.

[0033] In this embodiment, the placement tube 10 is preferably made of stainless steel.

[0034] like Figure 1 As shown, the inner hose 20 is in the shape of a circular tube and is disposed in the placement tube 10. The length of the inner hose 20 is not less than that of the placement tube 10. The inner hose 20 is made of a flexible and elastically deformable material.

[0035] In this embodiment, the inner hose 20 is preferably made of thermoplastic elastomer.

[0036] During use, because the length of the placement tube 10 is not less than the length of the tubular polymer fabric, and the length of the inner hose 20 is not less than the length of the placement tube 10, it can prevent the tubular polymer fabric from being unable to be stretched and shaped after being placed on the shaping mechanism of the present invention. In addition, each first circular ring composed of multiple shaping blocks 32 of the same group can be stretched and protruded.

[0037] like Figure 1 As shown, a plurality of shaping components 30 are provided on the placement tube 10. Each shaping component 30 includes a connecting rod 31, a shaping block 32, a fixing block 33 and an elastic member 34. The connecting rod 31 is slidably inserted into the through hole 11. The shaping block 32 and the fixing block 33 are both in the shape of an arc plate, the shaping block 32 is provided on one end of the connecting rod 31, and the fixing block 33 is provided on the other end of the connecting rod 31. The elastic member 34 is sleeved on the connecting rod 31, and one end of the elastic member 34 is connected to the fixing block 33, and the other end is connected to the inner wall of the placement tube 10. Among them, the shaping block 32 is made of a material with the property of thermal expansion and contraction.

[0038] In this embodiment, the shaping block 32 is preferably made of nylon material.

[0039] In this embodiment, the elastic member 34 is preferably a spring.

[0040] In this embodiment, the shaping blocks 32 on one end of the plurality of connecting rods 31 inserted into the same set of through holes 11 can form a first circular ring, the inner wall of which is in contact with the outer wall of the placement tube 10. The fixing blocks 33 on the other end of the plurality of connecting rods 31 inserted into the same set of through holes 11 can form a second circular ring, the inner wall of which is in contact with the outer wall of the inner hose 20. The diameter of the first circular ring is 0 to 0.2 mm larger than the diameter of the tubular polymer fabric.

[0041] During use, because the shaping block 32 is made of nylon, it can meet the requirements of thermal expansion and contraction while reducing manufacturing costs. Furthermore, because the diameter of the first ring is 0-0.2 mm larger than the diameter of the tubular polymer fabric, when the tubular polymer fabric is placed over multiple first rings, the first rings themselves can expand the tubular polymer fabric.

[0042] like Figure 1 As shown, two expansion components 40 are relatively slidably arranged in the inner hose 20. Each expansion component 40 includes an expansion block 41 and a control rod 42. The two ends of the expansion block 41 are sliding parts 411, and the middle is an expansion part 412. The sliding part 411 is in the shape of a spherical cone, and the expansion part 412 is cylindrical. The diameter of the expansion part 412 is larger than the diameter of the inner hose 20. One end of the control rod 42 is connected to the expansion block 41, and the other end is always located outside the inner hose 20.

[0043] In this embodiment, the length of the expansion portion 412 is not greater than the length of the shaping block 32 and the fixing block 33 .

[0044] In this embodiment, the difference between the diameter of the expansion portion 412 and the diameter of the inner hose 20 is smaller than the thickness of the shaping block 32 .

[0045] In this embodiment, the two control rods 42 can be pushed manually by a person, or a servo motor is provided at the other end of the two control rods 42 to control the movement of the two control rods 42 by the servo motor.

[0046] During use, because the length of the expansion portion 412 is no greater than the length of the shaping block 32 or the fixing block 33, the expansion block 41 can only expand two first rings at most. This facilitates controlling which first ring protrudes, preventing the protrusion of the first ring from affecting the shaping of the tubular polymer fabric. Furthermore, because the difference between the diameter of the expansion portion 412 and the diameter of the inner hose 20 is less than the thickness of the shaping block 32, the protrusion height of the first ring does not exceed the thickness of the shaping block 32. In other words, the protrusion of the first ring will not cause the tubular polymer fabric to be pinched.

[0047] During the shaping process, the expansion block 41 can be pushed into the inner hose 20 by the control rod 42. First, because the diameter of the expansion portion 412 of the expansion block 41 is larger than that of the inner hose 20, and the inner hose 20 is made of a flexible and elastically deformable material, the portion of the inner hose 20 located outside the expansion portion 412 is expanded. Second, because the fixing blocks 33 at the other ends of the multiple connecting rods 31 inserted into the same group of through holes 11 form a second circular ring, and the inner wall of the second circular ring is in contact with the outer wall of the inner hose 20, the expansion of the inner hose 20 also causes the second circular ring formed by the multiple fixing blocks 33 located outside the expansion portion 412 of the inner hose 20 to expand. Furthermore, because the shaping blocks 32 and the fixing blocks 33 are respectively located at the ends of the connecting rods 31, this also causes the first circular ring formed by the multiple shaping blocks 32 in the same group to expand. Therefore, when the tubular polymer fabric is sleeved on the multiple sets of shaping blocks 32, the two sets of shaping blocks 32 closest to the tubular polymer fabric and located on both sides of the tubular polymer fabric can be made to protrude, thereby preventing the tubular polymer fabric from slipping off the multiple sets of shaping blocks 32 during the shaping process, thereby ensuring the stability of the present invention when in use.

[0048] When the shaping work is completed, the expansion block 41 can be pulled back by the control rod 42 and moved outside the inner hose 20. Because the elastic member 34 is sleeved on the connecting rod 31, and one end of the elastic member 34 is connected to the fixed block 33, and the other end is connected to the inner wall of the placement tube 10, so after the inner hose 20 is no longer expanded by the expansion portion 412, the elastic member 34 will drive the fixed block 33 and the shaping block 32 to reset, so that the shaping block 32 retracts and the tubular polymer fabric can be easily removed.

[0049] Figure 2 The present invention is a schematic flow chart of a method for shaping a medical tubular polymer fabric.

[0050] like Figure 2 As shown, the present invention also provides a shaping method for a medical tubular polymer fabric, which is applicable to any of the above-mentioned shaping mechanisms for a medical tubular polymer fabric, and comprises the following steps:

[0051] S1. Place the tubular polymer fabric to be shaped on multiple sets of shaping blocks 32 (and place them in the middle) to allow the tubular polymer fabric to be initially stretched.

[0052] S2. Push the control rod 42 to move the expansion block 41 into the inner hose 20 until the two sets of shaping blocks 32 closest to the tubular polymer fabric and located on both sides thereof protrude, thereby limiting and fixing the tubular polymer fabric;

[0053] S3, placing the tubular polymer fabric after being limited and fixed in position into hot water at 70°C to 95°C for 5 to 10 minutes and then taking it out. During this process, the shaping block 32 will expand due to the heat and thus open the tubular polymer fabric again;

[0054] S4, then put the tubular polymer fabric into cold water at 4°C to 10°C for 5 to 10 minutes. During this process, the tubular polymer fabric is shaped by the cold, and the shaping block 32 shrinks by the cold, making it easier to remove the tubular polymer fabric later.

[0055] S5. Pull out the control rod 42 to move the expansion block 41 outward from the inner hose 20 until the two sets of shaping blocks 32 closest to the tubular polymer fabric and located on both sides thereof retract. Finally, the tubular polymer fabric is removed and dried to complete shaping.

[0056] Functions and Effects of the Embodiments

[0057] The medical tubular polymer fabric shaping mechanism and shaping method according to the present invention can reduce manual operation when expanding the tubular polymer fabric, thereby avoiding the problem of damage to the fabric appearance due to poor control of force when expanding the tubular polymer fabric, thereby improving the success rate of tubular polymer fabric shaping and indirectly reducing costs.

[0058] The above embodiments are preferred examples of the present invention and are not intended to limit the scope of protection of the present invention.

Claims

1. A medical tubular polymer fabric shaping mechanism, characterized in that: include: The placement tube is in the shape of a circular tube. A plurality of through holes are evenly opened on the tube wall of the placement tube along the circumference. The plurality of through holes form a group. The placement tube is provided with a plurality of groups of through holes along its axial direction. The inner hose is in the shape of a circular tube and is arranged in the placement tube. The length of the inner hose is not less than the length of the placement tube. A plurality of shaping components are provided on the placement tube, each of the shaping components includes a connecting rod, a shaping block, a fixing block and an elastic member, the connecting rod is slidably inserted in the through hole, the shaping block and the fixing block are both in the shape of an arc plate, the shaping block is provided on one end of the connecting rod, the fixing block is provided on the other end of the connecting rod, the elastic member is sleeved on the connecting rod, and one end of the elastic member is connected to the fixing block, and the other end is connected to the inner wall of the placement tube, Two expansion components are relatively slidably arranged in the inner hose. Each expansion component includes an expansion block and a control rod. The two ends of the expansion block are sliding parts, and the middle is an expansion part. The sliding part is in the shape of a spherical cone, and the expansion part is in the shape of a cylinder. The diameter of the expansion part is larger than the diameter of the inner hose. One end of the control rod is connected to the expansion block, and the other end is always located outside the inner hose. Among them, the shaping blocks on one end of the multiple connecting rods inserted in the through holes of the same group can form a first circular ring, the inner wall of the first circular ring is in contact with the outer wall of the placement tube, and the fixing blocks on the other end of the multiple connecting rods inserted in the through holes of the same group can form a second circular ring, the inner wall of the second circular ring is in contact with the outer wall of the inner hose.

2. The medical tubular polymer fabric shaping mechanism according to claim 1, characterized in that: in, The length of the placement tube is not less than the length of the tubular polymer fabric.

3. The medical tubular polymer fabric shaping mechanism according to claim 1, characterized in that: in, The inner hose is made of a flexible and elastically deformable material.

4. The medical tubular polymer fabric shaping mechanism according to claim 1, characterized in that: in, The shaping block is made of a material with the property of thermal expansion and thermal contraction.

5. The medical tubular polymer fabric shaping mechanism according to claim 1, characterized in that: in, The length of the expansion portion is not greater than the length of the shaping block and the fixing block.

6. The medical tubular polymer fabric shaping mechanism according to claim 1, characterized in that: in, The difference between the diameter of the expansion portion and the diameter of the inner hose is smaller than the thickness of the shaping block.

7. The medical tubular polymer fabric shaping mechanism according to claim 1, characterized in that: in, The diameter of the first ring is 0-0.2 mm larger than the diameter of the tubular polymer fabric.

8. A shaping method for a medical tubular polymer fabric, applicable to the shaping mechanism for a medical tubular polymer fabric according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Sheathing the tubular polymer fabric to be shaped on a plurality of sets of shaping blocks to initially expand the tubular polymer fabric; S2, pushing the control rod to move the expansion block into the inner hose until the two groups of shaping blocks closest to and located on both sides of the tubular polymer fabric protrude, thereby limiting and fixing the tubular polymer fabric; S3, placing the tubular polymer fabric after being limited and fixed in position into hot water at 70°C to 95°C for 5 to 10 minutes and then taking it out. During this process, the shaping block will expand due to the heat and thus expand the tubular polymer fabric again; S4, placing the tubular polymer fabric in cold water at 4°C to 10°C for 5 to 10 minutes, during which the tubular polymer fabric is shaped by the cold, and the shaping block shrinks by the cold, making it easier to remove the tubular polymer fabric later; S5. Pull out the control rod to move the expansion block toward the outside of the inner hose until the two groups of shaping blocks closest to the tubular polymer fabric and located on both sides thereof retract, and finally remove the tubular polymer fabric and dry it to complete the shaping.

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