CN203949831U - Weaving type non-vessel stent fatigue property test device - Google Patents
Weaving type non-vessel stent fatigue property test device Download PDFInfo
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- CN203949831U CN203949831U CN201420391589.8U CN201420391589U CN203949831U CN 203949831 U CN203949831 U CN 203949831U CN 201420391589 U CN201420391589 U CN 201420391589U CN 203949831 U CN203949831 U CN 203949831U
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Abstract
This technology provide a kind of simple in structure, realize the Weaving type non-vessel stent fatigue property test device convenient, test result is accurate, versatility is good, it comprise inner for place support after expansion and by the stent support after expansion be columniform flexible pipe, jet pipe around flexible pipe; On jet pipe, have import and outlet, import is connected with the hydraulic pressure of actuating medium or the output pipe of baric systerm are provided to jet pipe, exports as having the circumferential weld coaxial with flexible pipe on the jet pipe wall relative with flexible pipe periphery; In the port at flexible pipe two ends, support plug is set, the support plug of one end is fixed on the support plug coaxial with flexible pipe, and the support plug of the other end is free to slide on support plug, supports plug and is fixed on bracing frame through flexible pipe and support; Jet pipe is connected with the mobile device that drives jet pipe to move back and forth along flexible pipe axis.
Description
Technical field
This technology relates to the proving installation that Weaving type non-vessel stent performance is carried out to external fatigue property test.
Background technology
NiTi Weaving type non-vessel stent in self-expanding metal support be usually used in treating most of because of non-blood vessel optimum or that malignant tumour causes (digestive system cavity, respiratory system cavity, urinary system cavity etc.) narrow, and guarantee that cavity is unimpeded not stifled, be technological means conventional in clinical interventional therapy.The diameter of this support is larger than the internal diameter of target cavity, compresses and inserts in induction system, then being transported to the release of human lesion position.Support self-expands into preset diameters, produces and continues soft radial expansion force, acts on cavity inwall, narrow positions is progressively expanded and recovered unobstructed.Because Weaving type Self-expanded stent generally has good compliance, can be obedient to cavity nature physiological bending and peristalsis, thereby can keep cavity unimpeded, patient is also without too many discomfort simultaneously.Support is as long-term implant in body, and support can be subject to the continuous action of the particular surroundings of body lumen, and as the periodicity such as acid or alkali environment, peristalsis and acyclic load, these can cause stent wires fatigue break.The prickle of stent wires fatigue break may cause the serious complication such as patient is hemorrhage, ulcer.In order to evaluate the security of support product, must consider its fatigue lifetime.
The creeping effect of cavity is a principal element that causes stent fatigue fracture, and therefore the key of proving installation is the peristaltic wave effect of simulation cavity.Prior art all adopts mechanical test device to simulate cavity wriggling.But because the change in size scope of various Weaving type non-vessel stents is very large, in mechanical test device, generally test for the Weaving type non-vessel stent of specific specification, versatility and bad adaptability, and, mechanical test apparatus structure complexity, make support produce the variation of power required when radial compression unstable, test data can produce larger error.
Summary of the invention
The object of this technology be to provide a kind of simple in structure, realize the Weaving type non-vessel stent fatigue property test device convenient, test result is accurate, versatility is good.
Weaving type non-vessel stent fatigue property test device described in this technology, it comprises: inner for place support after expansion and by the stent support after expansion be columniform flexible pipe, jet pipe around flexible pipe; On jet pipe, have import and outlet, import is connected with the hydraulic pressure of actuating medium or the output pipe of baric systerm are provided to jet pipe, exports as having the circumferential weld coaxial with flexible pipe on the jet pipe wall relative with flexible pipe periphery; In the port at flexible pipe two ends, support plug is set, the support plug of one end is fixed on the support plug coaxial with flexible pipe, and the support plug of the other end is free to slide on support plug, supports plug and is fixed on bracing frame through flexible pipe and support; Jet pipe is connected with the mobile device that drives jet pipe to move back and forth along flexible pipe axis.
Above-mentioned proving installation, jet pipe has multiple, arranges along the axially spaced-apart of support.Distance between adjacent jet pipe is while placing the cavity wriggling of tested support, a distance that peristaltic wave moves in its one-period.
The principle of work of this proving installation: this device is with flexible pipe simulation people's cavity (as oesophagus), true reappearance the situation in support implant into body cavity.When test bracket fatigue lifetime, hydraulic pressure or baric systerm provide actuating medium to jet pipe, and the circumferential weld of actuating medium by jet pipe radially sprays to flexible pipe along flexible pipe, makes flexible pipe radial shrinkage, and provide translation mobile device to drive jet pipe reciprocating linear to move, simulate cavity with this and wriggle.If have the translation work simultaneously of multiple jet pipes and load to support hoop, can realize the effect that multiple peristaltic waves as shown in Figure 6 act on a support.
While fracture to support, jet pipe mobile frequency n between flexible pipe two ends can obtain the fatigue lifetime (number of days) of support divided by f, and f is certain cavity wriggling number of times of a day in human body, is generally 580-1000 time.Because being carries out hoop pressurization by flexible pipe to support with mode of jet by actuating medium (liquid or other) to make support radial shrinkage, so the each position of the hoop of support is stressed consistent, this is that common mechanical test device is difficult to accomplish.In addition, in the time need to changing the shrinkage degree of support, only need to adjust by pressure and/or the flow to actuating medium in jet pipe by hydraulic pressure or baric systerm, and, by hydraulic system or baric systerm regulate pressure and/or flow not only simple, and can accomplish electrodeless adjusting, this is also that common mechanical test device is difficult to accomplish.
Size for support is unrestricted, changeable, as long as can pass jet pipe, strong adaptability.
Because actuating medium sprays flexible pipe and support, and make support produce radial shrinkage, can make support produce certain axial displacement and axial deformation.According to the actual conditions of clinical practice, support can not produce axial displacement in body cavities, but the axial deformation meeting of support is subject to the impact of body cavities axial rigidity, but also can drive body cavities to produce certain axial deformation simultaneously.For preventing that support from producing axial displacement but can produce axial deformation, therefore the support plug of flexible pipe one end is fixed on and supports on plug, and the support plug of the other end can move freely supporting on plug.Like this, can simulate more really body cavities peristalsis situation, the test result of fatigue behaviour is more accurate.
Above-mentioned proving installation, in order to control well speed and the pressure of ejection medium, circumferential weld width is generally smaller, is 0.1-0.2mm.
Above-mentioned proving installation, described jet pipe is ring-shaped round pipe, and it has three and above is distributed on the import on ring-shaped round pipe, and described inlet diameter is identical with the internal diameter of ring-shaped round pipe.When jet pipe has three above imports, pressure, the flow velocity etc. of the jet spraying everywhere from circumferential weld can reach substantially equal in moment, ensured stressed substantially equal to everywhere of hose loop.
Certainly, can adopt wheatstone bridge circuits, cause that with the unexpected variation of resistance the unexpected variation of electric current judges the fracture of stent wires.Above-mentioned proving installation, it also comprises for judging by the variation of measuring support resistance the wheatstone bridge circuits whether stent wires ruptures, support is connected in brachium pontis as a resistance, two diagonal line of bridge diagram connect respectively the two ends of direct supply, and two other diagonal line connects a galvanometer.Wheatstone bridge circuits is prior art, no longer describes.
This technology provide simultaneously a kind of easy to operate, be easy to realize, Weaving type non-vessel stent testing method of endurance performance that all can be applicable to the support of different size.
Weaving type non-vessel stent performance test methods described in this technology, to adopt above-mentioned proving installation, hydraulic pressure or baric systerm provide actuating medium to jet pipe, actuating medium is radially spraying to flexible pipe along flexible pipe by circumferential weld, make flexible pipe and support jointly produce radial shrinkage, mobile device drives jet pipe to move back and forth until support fracture along flexible pipe axis, t=n/f fatigue lifetime that moves back and forth frequency n and calculate support with jet pipe on flexible pipe axial direction, the unit of t is sky, former the wriggling number of times of cavity every day of the people that f is implant frame.As, adult's oesophagus, f span is 580-1000.Jet pipe moves back and forth along flexible pipe axis, is used to form the peristaltic wave load of biosome cavity.
Above-mentioned method of testing, actuating medium during along radially the spraying to flexible pipe of flexible pipe, makes support radial shrinkage 12-18% by circumferential weld.Support radial shrinkage amount be according to be placed on cavity as the initial pre compressed magnitude of Endo-esophageal Weaving type non-vessel stent be non-vessel stent diameter 15% determine.
Above-mentioned method of testing, the temperature of actuating medium and test environment is 37 DEG C of left and right that approach body temperature, to simulate more really the residing environment of body cavities.
Above-mentioned method of testing, is connected on using support as a resistance in a brachium pontis of wheatstone bridge circuits, and two diagonal line of bridge diagram connect respectively the two ends of direct supply, and two other diagonal line connects a galvanometer; The unexpected variation of the electric current showing by galvanometer judges whether the silk thread of support ruptures.
Brief description of the drawings
Fig. 1 is Weaving type non-vessel stent performance testing device schematic diagram;
Fig. 2 is the A-A cut-open view (amplifying, not containing mobile device 27) in Fig. 1;
Fig. 3 is the B-B cut-open view (amplification) in Fig. 2;
Fig. 4 is the schematic diagram of hydraulic system etc.
Fig. 5 is wheatstone bridge circuits schematic diagram.
Fig. 6 is that the multiple wriggling loads of simulation are on cavity and the multiple peristaltic waves that obtain act on the design sketch on support simultaneously.
Embodiment
Embodiment 1: Nitinol Weaving type Esophageal Stent is carried out to fatigue property test.
The parameter of support 12: support is in the time of free state, and interlude external diameter diameter is 20mm, and a number is 22, and the diameter of alloy silk thread is 0.2mm, and helical pitch is 64mm.
Weaving type non-vessel stent performance testing device shown in Figure 1, it is the silica gel hose 20 that 20mm, wall thickness are about 1mm that the support of contraction state is put into internal diameter, then releasing bracket 12, and support 12 is expanded voluntarily, contact completely with flexible pipe 20 inwalls, reach equilibrium state.
Left support plug 211, right support plug 212 are set respectively in the port at flexible pipe 20 two ends, support plug 22 two ends coaxial with flexible pipe 20 are fixed on bracing frame 28, right support plug 212 is fixed on and supports on plug 22, and what 211 of left support plugs were free to slide is arranged on support plug 22.
Referring to Fig. 2,3, are ring-shaped round pipe 24 around the jet pipe of flexible pipe 20.Ring-shaped round pipe has four uniform imports 25 on lateral wall, import with provide the output pipe of the hydraulic system of hydraulic medium to communicate to ring-shaped round pipe 24.Ring-shaped round pipe has the circumferential weld 26 coaxial with flexible pipe 20 on madial wall.The width of circumferential weld 26 is 0.2mm.
In hydraulic system shown in Figure 4, hydraulic medium in water tank 1 filters backward gear-type pump 4 feed flows by filtrator 2, the hydraulic medium that gear-type pump 4 pumps communicates with four imports of ring-shaped round pipe 24 through bi-bit bi-pass solenoid directional control valve 6, piloted reducer 7, throttling valve 8, flowmeter 9, and four imports of ring-shaped round pipe 24 are in parallel in whole hydraulic system.Hydraulic medium enters after ring-shaped round pipe 24, radially spraying to flexible pipe 20 from circumferential weld 26 along flexible pipe 20.The pressure that enters the hydraulic medium of ring-shaped round pipe 24 is set up by piloted reducer 7, reads pressure by tensimeter 10.Control by throttling valve 8 flow that enters jet pipe.The break-make of spraying is controlled by bi-bit bi-pass solenoid directional control valve 6.When workpiece loading and unloading, hydraulic system can be passed through 3 off-loads of bi-bit bi-pass solenoid directional control valve, so that energy-conservation.Surplus valve 5 off-loads, protection hydraulic system safety.
Ring-shaped round pipe 24 is connected with the mobile device 27 that drives jet pipe to move back and forth along flexible pipe axis.
When Weaving type non-vessel stent performance is tested, hydraulic system provides hydraulic medium to jet pipe, hydraulic medium by circumferential weld along flexible pipe radially to flexible pipe spray, make flexible pipe radial shrinkage.By adjusting pressure and the flow of hydraulic pressure, while making the radial shrinkage amount of support be support free state 15% of interlude external diameter.Translation mobile device drives jet pipe to move back and forth until support ruptures along flexible pipe axis, and the frequency n moving back and forth with jet pipe on the axial direction of flexible pipe two ends calculates t=n/1000 fatigue lifetime of support, and the unit of t is sky.The 1000th, former the wriggling number of times of oesophagus every day of adult.
Certainly, in order more easily to judge whether support ruptures, can adopt wheatstone bridge circuits (as shown in Figure 5), cause that with the unexpected variation of resistance the unexpected variation of electric current judges the fracture of stent wires, this belongs to prior art, no longer describes.In Fig. 5, be connected to bridge diagram using support as resistance R 4 with other three resistance R 1, R2, R3 composition, two diagonal line of bridge diagram connect respectively the two ends of direct supply, and two other diagonal line meets data acquisition unit DAQ; The unexpected variation of the data that gather by data acquisition unit DAQ judges whether support ruptures.
Carry the hydraulic medium of certain pressure by hydraulic system to jet pipe, and form ring-type and pressure, jet that uninterrupted is adjustable, act on support periphery, then the axial direction to-and-fro movement at support by translation mobile device drive jet pipe.The pressure size of annular jet hydraulic medium is set according to the physiological characteristic of the non-blood vessel cavity of clinical human body with the speed that moves axially motion, can be for describing the physiological movement state of biosome, as the transmission of esophageal peristalsis ripple.
The biomechanics characteristic of the non-blood vessel cavity of this technical basis human body (oesophagus, enteron aisle etc.), select applicable hose material (as silica gel etc.) to replace various cavities, and adopt fluid pressure to act on the motion feature (as: peristalsis of the digest tract etc.) of the dynamic loading enforcement biosome cavity on support, thereby complete the experiment of stent fatigue performance.
Claims (5)
1. Weaving type non-vessel stent fatigue property test device, is characterized in that: it comprises: inner for place support after expansion and by the stent support after expansion be columniform flexible pipe, jet pipe around flexible pipe; On jet pipe, have import and outlet, import is connected with the hydraulic pressure of actuating medium or the output pipe of baric systerm are provided to jet pipe, exports as having the circumferential weld coaxial with flexible pipe on the jet pipe wall relative with flexible pipe periphery; In the port at flexible pipe two ends, support plug is set, the support plug of one end is fixed on the support plug coaxial with flexible pipe, and the support plug of the other end is free to slide on support plug, supports plug and is fixed on bracing frame through flexible pipe and support; Jet pipe is connected with the mobile device that drives jet pipe to move back and forth along flexible pipe axis.
2. proving installation as claimed in claim 1, is characterized in that: described jet pipe is ring-shaped round pipe, and it has more than three or three imports on ring-shaped round pipe that is distributed on.
3. proving installation as claimed in claim 1, it is characterized in that: further comprising for judging by the variation of measuring support resistance the wheatstone bridge circuits whether stent wires ruptures, support is connected in brachium pontis as a resistance, two diagonal line of bridge diagram connect respectively the two ends of direct supply, and two other diagonal line connects a galvanometer.
4. proving installation as claimed in claim 1, is characterized in that: jet pipe has multiple, arranges along the axially spaced-apart of support.
5. proving installation as claimed in claim 1, is characterized in that: circumferential weld width is 0.1-0.2mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420391589.8U CN203949831U (en) | 2014-07-16 | 2014-07-16 | Weaving type non-vessel stent fatigue property test device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420391589.8U CN203949831U (en) | 2014-07-16 | 2014-07-16 | Weaving type non-vessel stent fatigue property test device |
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| CN203949831U true CN203949831U (en) | 2014-11-19 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104122151A (en) * | 2014-07-16 | 2014-10-29 | 南京林业大学 | Woven nonvascular stent fatigue performance testing device and method |
| CN110031346A (en) * | 2019-03-04 | 2019-07-19 | 深圳市美好创亿医疗科技有限公司 | Silicon stent device for testing endurance and method |
| CN110617954A (en) * | 2019-10-18 | 2019-12-27 | 江苏理工学院 | External bending test device for fatigue performance of intravascular stent |
| CN110617955A (en) * | 2019-10-18 | 2019-12-27 | 江苏理工学院 | External testing device for fatigue performance of blood vessel support |
-
2014
- 2014-07-16 CN CN201420391589.8U patent/CN203949831U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104122151A (en) * | 2014-07-16 | 2014-10-29 | 南京林业大学 | Woven nonvascular stent fatigue performance testing device and method |
| CN104122151B (en) * | 2014-07-16 | 2016-04-13 | 南京林业大学 | Weaving type non-vessel stent fatigue property test device and method |
| CN110031346A (en) * | 2019-03-04 | 2019-07-19 | 深圳市美好创亿医疗科技有限公司 | Silicon stent device for testing endurance and method |
| CN110617954A (en) * | 2019-10-18 | 2019-12-27 | 江苏理工学院 | External bending test device for fatigue performance of intravascular stent |
| CN110617955A (en) * | 2019-10-18 | 2019-12-27 | 江苏理工学院 | External testing device for fatigue performance of blood vessel support |
| CN110617954B (en) * | 2019-10-18 | 2021-04-13 | 江苏理工学院 | External bending test device for fatigue performance of intravascular stent |
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