CN200998362Y - Cataract operation attraction flow regulation valve - Google Patents

Abstract

The utility model relates to a cataract operation aspiration flow rate adjusting valve, which belongs to the medical appliance. The utility model consists of a valve body, a valve core, a permanent magnet in the valve core body, a coil corresponding to the valve core and arranged outside the valve body, a sensor for detecting the pressure in the valve body, and an end cover. During use, the flow rate adjusting valve is connected between a cataract operation aspiration pipe and an operating handle in series. The pressure state in the aspiration pipe and the valve body is transferred to a controller outside the valve from the pressure sensor through a cable, the controller can control the position of valve core through transporting the magnetic field produced by the proper electric energy to the coil outside the valve body according to the preset program and parameters, to attain the purpose of controlling the flow rate according to different pressure state, and to establish a novel and safe pressure and flow rate relationship during the cataract operation, to ensure that the operation safety is greatly improved during the operation, in particular in the cataract ultrasonic emulsification operation. The utility model also creates the condition for increasing the aspiration force of ultrasonic emulsification needle head, reducing the using of ultrasonic energy, and further lightening the damage to the intraocular tissue.

Description

Cataract operation attracts flow control valve

One. technical field

This utility model relates to medical apparatus and instruments, is used for the ophthalmology cataract operation and annotates desorption system, and desorption system is annotated in operation as cataract ultrasonic emulsification, desorption system is annotated in laser cataract emulsifying operation.

Two. background technology

It is will have the liquid of certain altitude difference to import in the eyeball with work surface with pipeline that cataract operation is annotated desorption system, passes through negative pressure source with pipeline simultaneously, with attracting syringe needle with intraocular liquid and the sucking-off of cataract fragment, to clean operative region in the eyeball.Ultrasonic emulsification for cataract is to annotate on the basis of desorption system at cataract operation, has increased the ultrasonic emulsification crushing technology so that with cataract by thinner pipeline sucking-off, extract cataractous operation method to reach little otch.Described attraction syringe needle, be the ultrasonic emulsification syringe needle this moment, be arranged on a front end of being convenient to perfusion that doctor operation is built-in with ultrasonic generating means and hollow and the operating grip that attracts passage etc., attraction passage in it, in order to sucking-off by the cataract chip after pulverizing, perfusion channel in it, in order to intraocular irrigation liquid to keep intraocular pressure and space.Attract passage to link to each other by the negative pressure source of flexible pipe and ultrasonic emulsification instrument, negative pressure source is necessary for and attracts passage that enough big negative pressure is provided during work, so that the ultrasonic emulsification syringe needle is can be with cataract chip sucking-off eye outer and the fragment of cataract bulk is attracted to the ultrasonic emulsification syringe needle inhales the hole and sentence just Ultrasonic Pulverization, simultaneously must be for the ultrasonic emulsification syringe needle provide enough big absorption affinity, otherwise the cataract fragment that holds will clash into also not pulverized to organize near promptly being pushed open the intraocular surgery zone by hyperacoustic repulsion.In order to keep the relatively stable of intraocular structure and intraocular pressure in the operation process to keep enough big space, on the outer wall of ultrasonic emulsification syringe needle, be with a flexible pipe, gap between this flexible pipe and the ultrasonic emulsification syringe needle outer wall, constitute the perfusion channel end, in order to replenish, keep necessary ophthalmic space from the liquid loss that attracts passage sucking-off and otch leakage etc. to be caused; Perfusion channel is linked to each other with the perfusion fluid bottle by flexible pipe, and the pressure of perfusion fluid is by the height decision of liquid bottles, and the flow of perfusion fluid is by factors such as the effective cross section decision of height and the intraocular pressure and the pipeline of perfusion fluid.After above-mentioned ultrasonic emulsification syringe needle enters ophthalmic, can think that it has entered an airtight working chamber, perfusion channel communicates within the eye with attracting passage, when also not having thing to block ultrasonic emulsification syringe needle suction hole, attract the liquid in passage and the perfusion channel, the pressure of dependence perfusion fluid and attraction channel end, convection cell is got rid of the flow controller control of speed during the work of control negative pressure source, it is mobile to remain a constant speed, perfusion and sucking-off flow are in the positive balance state that irrigation flow is subjected to the sucking-off flow restriction, can keep good ophthalmic space and pressure.Carrying out along with operation, in case blocking the ultrasonic emulsification syringe needle, bigger cataract fragment inhales the hole, intraocular liquid promptly stops outflow, and negative pressure source still will connect fluid removal in the flexible pipe with the flow velocity that is provided with this moment, make that the interior receipts distortion of connection flexible pipe, volume diminish, negative pressure is accumulated, the negative pressure in attracting passage rises to the set level of machine; Perfusion channel is obstructed because of the effusive liquid of ophthalmic, the also corresponding decline of its flow, and intraocular pressure rises thereupon.Inhale " moment " that the cataract fragment on the hole is pulverized suddenly when getting lodged in the ultrasonic emulsification syringe needle, attract negative pressure and intraocular pressure in the passage promptly to be converted into fluid dynamic energy, force intraocular liquid so to pour out through the Phacoemulsification needle head process, go replenish to connect the volume forfeiture of flexible pipe and because of the descend eliminating amount of the negative pressure source that restarts of negative pressure, this moment, the fluid flow of ultrasonic emulsification syringe needle was far longer than the flow that is provided with before the operation, this liquid pours out, much larger than also having little time the amount of pouring into of compensation rapidly, broken the poised state of perfusion and sucking-off flow, intraocular pressure occurring sharply descends, the ophthalmic volume reduces, eye inner tissue loses support force, the cornea inner face retreats, the posterior lens capsule reach, anterior chamber working place instability, anterior chamber's surge phenomenon that anterior chamber's volume dwindles, " anterior chamber is subsided " appears in obliteratio camerae anterior when serious, can cause corneal injury thus, capsule breaks after the cataract, serious consequences such as vitreous body is sucked out, even if " anterior chamber is subsided " do not take place, because the excessive power of sucking that high flow capacity produced at ultrasonic emulsification syringe needle suction inlet place also may be with eye inner tissue's sucking-off.Above-mentioned situation all has the possibility of generation at any time in the whole surgery process.Allow most the people worry in Here it is the ultrasonic emulsification for cataract and be the most serious what is called " safety " problem.Clearly, the generation of this situation is relevant with vacuum magnitude, and negative pressure is big more, and the probability of generation is just big more.Generally operative doctor is in the operating process of reality, for avoiding the generation of above situation, the attention of having to high concentration, very careful, in case find that the cataract fragment of blocking the emulsifying syringe needle is pulverized, make a response immediately, adjust the duty of main control system backpedalling brake rapidly, the suction force that allow main frame ultrasound wave output stop, negative pressure source produced reduces even stops.If it is blunt slightly to react, above-mentioned " danger " promptly can take place.Therefore, anaphylaxis can take place or adjust the duty of backpedalling brake consciously in advance in a lot of operators in the art, but great majority fail to reach ideal Ultrasonic Pulverization effect in this case, must readjust backpedalling brake and carry out Ultrasonic Pulverization again, work efficiency is descended, and operating time prolongs.The generation of many operators above-mentioned because of fearing " danger " is arranged, take to reduce the way that the negative pressure of main frame is provided with, make the cataract fragment be not easy to attracted to the ultrasonic emulsification syringe needle and inhale the place, hole, be not enough to overcome the repulsion that ultrasound wave produces with the absorption affinity of inhaling the place, hole owing to the ultrasonic emulsification syringe needle, little cataract fragment will be impacted to such an extent that disorderly hit within the eye, work efficiency is descended, the serious corneal wound that can not repair also may take place simultaneously.So far one clearly the fact tell us, set negative pressure can not arbitrarily reduce in the ultrasonic emulsification operation, in addition, existing ultrasonic emulsification syringe needle, both be convenient to bigger cataract fragment by guaranteeing best ultrasonic output again, so its bore does not allow to change yet because taken all factors into consideration.Under such prerequisite, for preventing the generation of above-mentioned danger, people have attempted many ways, show division and are analyzed as follows:

(1) improve injection pressure, but excess pressure can cause serious postoperative complication equally.And the injection pressure of raising is limited, can not adapt with bigger attraction negative pressure in the operation.

(2) elongate ultrasonic emulsifying syringe needle, the tube chamber length of thin part increases the liquid resistance to outflow to slow down the speed that fluid flow increases suddenly by increasing in the attraction pipeline, but after increasing the length of syringe needle, operative radius increases, operation easier is increased, and the length that increases is limited, therefore, its effect that slows down fluid flow increase suddenly is insignificant, so its effect does not reach desirable requirement.

(3) increase a passage that pours into ophthalmic, but this can increase the wound to eyeball, can make a difference to other operation after increasing an injection gallery in addition again, and still exist the ultrasonic emulsification syringe needle to inhale hole plug when " moment " removes suddenly, pour into the peak-peak of fluid flow and peak-peak and the fluid acceleration degree that fluid acceleration can not adapt to the sucking-off fluid flow, the situation of sucking-off amount greater than the amount of pouring into appears, and the danger that brings of the excessive power of sucking that does not just overcome high flow capacity at all and produced.

(4) pressure information feedback compensation mechanism: will attract pressure state in the passage to feed back to the control centre of main frame by the pressure transducer on the ultrasonic emulsification instrument, in case the situation that attracts the negative pressure in the passage to decline to a great extent is arranged, control centre promptly sends " stopping " instruction to negative pressure source, to stop the generation of negative pressure, slow down the increase of discharge, supercharging simultaneously oppositely backflows liquid or by dypass fluid replacement in pipeline, to fill the volume that attraction pipeline enlarges because of pressure release, substitute the discharge of ophthalmic liquid.Yet will reach the host computer control part for information about by pick off, sending instruction generation action by the latter to associated components again is an after reaction, even if the time-delay of associated components reaction is ignored, 2.5 meters flexible tube chambers that long bore is relatively large owing to have an appointment between the position that main frame and anterior chamber are subsided, when raising gradually, the main frame negative pressure just accumulating big energy gradually herein, this a part of energy discharges needs time and cubage compensation, even there is fluid to backflow simultaneously, because the influence of tube chamber length and tube wall resistance factor, " moment " variation that this feedback mechanism is inhaled the place, hole to the ultrasonic emulsification syringe needle also seems slightly blunt, and just obvious more to high more negative pressure " blunt ", can not require with the high negative pressure ultrasonic emulsification of clinical proposition to adapt.And, also exist the attraction tube chamber to rush down and press back ultrasonic emulsification syringe needle to run out of steam, work efficiency is descended.

(5) use the ultrahard flexible pipe instead after the increase compensation mechanism, change, reduce its retarding action the main frame pressure change to reach the volume that reduces after pipeline body cavity negative pressure is accumulated.As previously mentioned, because of pipeline is about 2.5 meters, bore is also relatively large, thereby acts on limited.

(6) one section thin especially pipeline of serial connection on the connection flexible pipe behind the ultrasonic emulsification syringe needle, though can suppress the generation of big flow, the flow when having occurred lower negative pressure simultaneously descends, and the power of sucking of ultrasonic emulsification syringe needle descends, and capturing ability goes down.

By above-mentioned analysis with according to the flow of principle of hydrodynamics, relation between fluid dynamic energy and the effective fluid passage sectional area as can be known, because near the ultrasonic emulsification syringe needle, lack effectively effective fluid passage sectional area regulatory mechanism, so, can not there be fluid flow stably at ultrasonic emulsification syringe needle suction inlet place, also can not provide enough big attraction negative pressure for operation, in fact, existing equipment maximum can only provide negative pressure about 500mmg for operation, can not be for the cataract ultrasonic emulsification syringe needle provide enough big, being produced by suction and ultrasonic emulsification syringe needle opening is shearing force, cuts apart cataract.Therefore, still comparatively satisfied at present, the way of pouring into and attract flow equilibrium in the cataract operation solved.

Three. summary of the invention

The purpose of this utility model, it is the attraction flow that solves existing cataract operation equipment, only just raise with negative pressure passively, negative pressure reduces and reduces, in case thereby cause the ultrasonic emulsification syringe needle blocked, connecting pipe is because of the effect of negative pressure source, stereomutation and energy accumulation take place at once, cause the obstruction of ultrasonic emulsification syringe needle opening part in case remove, send out peak flow immediately suddenly, make big quantity of fluid be sucked out eyeball, bring the problem of security threat, occur for ultrasonic emulsification syringe needle in the cataract operation provides no obvious peak value flow to operation, stably, safety, can improve the ideal liquid flow mode of suction catheter intracavity negative pressure greatly, also for realizing that the superelevation negative pressure cataract operation of being advocated created condition.

The scheme that this utility model solves its technical problem is: valve body with three-way pipe structure of serial connection behind the ultrasonic emulsification handle, in in three passages of valve body one of them, setting includes the permanent magnet spool, end at spool place passage has end cap, outside the valve body of position, spool place correspondence, coil is arranged, the passage of two other perforation is as the fluid passage in three passages of valve body, and at the end at place, circulation road spool place/or two ends, valve body is provided with pressure transducer; Or behind the ultrasonic emulsification handle serial connection a valve body with straight pipe type structure, rise with the end cap of hollow and form the fluid passage, be provided with in the valve body and include the permanent magnet spool, the valve body of position, spool place correspondence has coil outward, an end of locating at circulation road spool place/or two ends, valve body is provided with pressure transducer.The magnetic field that produces by the application valve body exterior loop during work, change in the valve body, bury the spool position of permanent magnet in the body, and change the size of effective fluid passage in the valve body, with the flow control valve of the fluid passage resistance of following change, directly control, regulate the fluid flow of flowing through herein.During use two ends of valve body is connected with the pipe joint of the vacuum suction pipeline end of the pipe joint of ultrasonic emulsification handle end and cataract operation equipment respectively, flow control valve, the controlled Flow-rate adjustment controller that is formed on flow control valve, according to the pressure condition that reaches the flow control valve front and back in the attraction pipeline, by parameter that sets in advance and program, the flow under the flow, particularly high negative pressure state of the Flow-rate adjustment valve body inner fluid of flowing through is controlled, regulated to automatic feedback control.

The beneficial effects of the utility model are: by according to the pressure size by parameter that sets in advance and program, change the intravital fluid passage of valve size and the fluid resistance of following change, make that to attract flow in the cataract operation more steady, can keep the dynamic equilibrium of good intraocular irrigation and attraction flow, for cataract operation provides the intraocular pressure fluctuation littler, anterior chamber's environment that eye inner tissue's structure is more stable, make and perform the operation especially that the cataract ultrasonic emulsification operation safety increases substantially, the psychentonia degree of operator obviously descends, operation technique is simpler, easier study, and can realize what a kind of existing equipment can not provide, higher negative pressure, brand-new negative pressure and discharge relation, for the ultrasonic emulsification syringe needle provides safe, steadily increase, enough big captivation, make the syringe needle suction inlet produce the shearing force slowly that is shifted to the object that holds, participate in hard cataractous cutting apart, and the cataract after will being cut, transport out eyeball by narrow and small syringe needle tube, when performing the operation, may the ultrasonic energy of eye inner tissue's infringement be discharged in eyeball, operation efficient is improved to reduce cataract ultrasonic emulsification.

Four. description of drawings

Fig. 1 is the structure chart of first embodiment of cataract operation flow control valve; Fig. 2 is the A-A cutaway view of Fig. 1.

Fig. 3 is the structure chart of second embodiment of cataract operation flow control valve; Fig. 4 is the B-B cutaway view of Fig. 3; Fig. 5 is the front view of spool 2 among Fig. 3; Fig. 6 is the C-C cutaway view of Fig. 3.

With reference to accompanying drawing 1: first embodiment of the present utility model, valve body 1 with three-way pipe structure, in in three passages of valve body 1 one of them (for convenience of description, this accompanying drawing 1 makes progress the footpath that spool 2 is arranged on the fluid passage), be equipped with the spool 2 that buries permanent magnet 4 in the body, valve body in position, spool 2 place correspondence is around with coil 3, end at spool place passage has end cap 6, make it become blind pipe, one of the circulation road of locating at spool 2 places/or two ends, valve body 1 is provided with the pressure transducer 5 that detects its body internal pressure, in order to prevent the pressure inequality at spool two ends, influence the motion of spool, side at spool, do not influencing under the situation of spool to the sealing of opposite side, one gap 7 is arranged between valve body 1 and the spool 2, to link up the two ends of spool 2, the shape at the two ends of the fluid passage of valve body 1, match with the pipe joint of existing cataract operation equipment attraction pipeline, outside the cataract operation flow control valve, have microprocessor domination down-off and regulate control joint device, by the pressure transducer 5 of cable and cataract operation flow control valve, coil 3 connects.

With reference to accompanying drawing 2: second embodiment of the present utility model, have the valve body 1 of straight pipe type structure and the end cap 6 of hollow and form the fluid passage, in valve body 1, be equipped with the spool 2 that buries permanent magnet 4 in the body, the work surface of spool 2 is the conical surface, gap between spool 2 surfaces and the fluid passage inner surface, constitute the passage of fluid flow, when spool 2 is in the most end of apex partis petrosae extreme direction, the gap of itself and fluid passage inner surface is minimum even close, valve body in position, spool 2 place correspondence is around with coil 3, one end of the circulation road of locating at spool 2 places/or two ends, valve body 1 is provided with the pressure transducer 5 that detects its body internal pressure, the pipe joint of the shape at two ends, fluid passage and existing cataract operation equipment attraction pipeline matches, and outside the cataract operation flow control valve, has microprocessor dominant discharge adjustment control, by the pressure transducer 5 of cable and cataract operation flow control valve, coil 3 connects.

During use, the fluid passage of control valve is serially connected in, the cataract ultrasonic emulsification handle end, and between the pipe joint of cataract operation equipment vacuum suction pipeline end, coil 3 and pressure transducer 5 join with cable and cataract operation Flow-rate adjustment controller, pressure transducer 5 is communicated to the Flow-rate adjustment controller with attraction pipeline internal pressure state, the latter is by parameter that sets in advance and program, transmit electric power to coil 3, coil 3 energising backs produce field drives spool 2 and change the position, thereby size of the fluid passage in the valve body 1 and corresponding fluid resistance change, with control, the adjusting valve body 1 fluidic flow of flowing through.

Claims (9)

1. a cataract operation attracts flow control valve, it is characterized in that having the valve body (1) of three-way pipe structure, in one of them in three passages of valve body (1), spool (2) is set, and at the end of spool (2) place passage end cap (6) is arranged.

2. cataract operation according to claim 1 attracts flow control valve, it is characterized in that outside the valve body (1) of spool (2) position, place correspondence coil (3) being arranged.

3. cataract operation according to claim 1 and 2 attracts flow control valve, it is characterized in that spool (2) includes permanent magnet (4).

4. attract flow control valve according to claim 1,2 or 3 described cataract operations, it is characterized in that, an end of locating at circulation road spool (2) place/or two ends, valve body (1) is provided with pressure transducer (5).

5. a cataract operation attracts flow control valve, it is characterized in that, has the valve body (1) of straight pipe type structure and the end cap (6) of hollow and forms the fluid passage, and spool (2) is set in the valve body (1).

6. cataract operation according to claim 5 attracts flow control valve, it is characterized in that, coil (3) is arranged outside the valve body (1) of spool (2) position, place correspondence.

7. attract flow control valve according to claim 5 or 6 described cataract operations, it is characterized in that spool (2) includes permanent magnet (4).

8. attract flow control valve according to claim 5,6 or 7 described cataract operations, it is characterized in that, an end of locating at circulation road spool (2) place/or two ends, valve body (1) is provided with pressure transducer (5).

9. attract flow control valve according to claim 5,6,7 or 8 described cataract operations, it is characterized in that the work surface of spool (2) is the conical surface.

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