CN217245134U - Glass cutting head for cutting vitreous body of ophthalmology department - Google Patents

Abstract

The utility model provides a cutting head has compound outer tubular construction's ophthalmology vitreous body cutting and uses glass cutting head, and the cutting head includes broach shell, sword core and compound outer tube, and the outside of broach shell sets up compound outer tube, is provided with in the compound outer tube to assist gas channel intercommunication and assists air chamber an, and the other end setting of assisting the gas channel is at the edge of a knife upside, and sword core suit is in the broach shell, and the inner connection of sword core is fixed on the switching-over valve, is provided with the interface channel in the cutting head, and the edge of a knife is through interface channel intercommunication drainage channel. Compare in original glass-cutting sword, the utility model provides a glass-cutting sword utilizes the gas channel of assisting to provide two-way effect with the position of the sealed gas propelling movement to the edge of a knife at reciprocating motion's in-process, and the excretion passageway is through original negative pressure effect, and the gas of assisting the gas channel combustion gas provides new positive pressure and supplyes, provides forward pressure to pathological change tissue, makes pathological change tissue paste tight edge of a knife, prevents that the excision in-process pathological change tissue from breaking away from.

Description

Glass cutting head for cutting vitreous body of ophthalmology department

Technical Field

The utility model relates to the technical field of medical equipment, concretely relates to novel vitreous body excision of ophthalmology is with glass crop head.

Background

The vitreous body is a colorless transparent semisolid colloidal substance which is filled between retina and crystalline lens and has the functions of refraction and retina fixation. The vitreous body is used as a refractive interstitium, and also has the functions of filling the interior of eyes and keeping the shape of eyeballs. The vitreous body is easy to be affected by certain bleeding, inflammation, trauma and certain degenerative diseases such as tumor, etc., the lesions are generally divided into three types, namely vitreous body turbidity, vitreous body hematocele and vitreous body proliferation, and the affected vitreous body generally needs to be operated to treat the disease, such as vitreous body cutting.

The vitreous cutting operation means that turbid vitreous or lesion vitreous is cut away by means of operation so as to recover the permeability of light, or vitreous is cut away, so that the dragging of the vitreous to the retina is relieved or relieved, so that the retina disease is treated, and the visual function of a patient is recovered. The vitreous cutting operation is widely used in clinical practice, and the operation range almost relates to the whole eyeball. The vitrectomy head used by the existing vitrectomy cutter is generally reciprocating, and the diseased vitreous body is cut off by the relative motion of the inner tube and the outer tube and then is sucked away for treatment, but the efficiency is often low, and meanwhile, the vitreous nucleus adhered to tissues such as a computerized film, a blood clot and the like is difficult to be sucked into a vitrectomy head lumen, so that the conditions of incomplete treatment, poor healing and the like are caused. The existing double-tube type and high-frequency type vitrectomy heads have low clinical utilization rate due to the conditions that the design is complex, the volume is too large, micro-cutting cannot be carried out, high-frequency vibration easily causes contusion to a vitreous body and the like.

Patent publication CN110996864A discloses a vitrectomy probe that moves back and forth within a drive chamber by alternately supplying and exhausting air on either side of the septum in the drive chamber, causing the cutting inner tube to oscillate within the cutting outer tube such that the open distal end of the cutting inner tube moves back and forth across the outer port side opening to cut tissue entering the outer port side opening.

A cavity for gathering a part of gas is formed at the lower side of the driving chamber, and the part of gas needs to be continuously compressed or stretched in the reciprocating process, so that the overall efficiency of reciprocating motion is poor, and more energy consumption is needed; simultaneously be full of liquid tissue in the vitreous body, when relying on the negative pressure suction to cut, the intensity is absorb to the negative pressure ground has strict restriction, the negative pressure is too strong and arouses the tissue to absorb too fast easily, thereby influence the internal pressure unbalance of vitreous body and cause more serious consequence, the pathological change tissue in the less than vitreous body of the absorption effort of pathological change tissue is mostly flexible tissue, only rely on the suction that the negative pressure provided and the cutting effect that the interior outer tube of glass cutter stings each other unsatisfactory, be difficult to cut off flexible pathological change tissue, lead to the operation effect unsatisfactory, the operation efficiency is lower.

SUMMERY OF THE UTILITY MODEL

The problems that the overall efficiency of reciprocating motion is poor and energy consumption is high due to the fact that gas in a cavity at the lower side of a compression and stretching driving chamber is needed in the reciprocating motion process, and the suction force provided by negative pressure and the cutting effect caused by mutual biting of an inner tube and an outer tube of a glass cutter are not ideal are solved.

The utility model provides a cutting head has compound outer tubular structure's ophthalmology vitreous body cutting with glass cutting head, including handle and cutting head, the cutting head suit is on the handle, and wherein the front end of handle is fixed with the pullover that is used for installing the cutting head.

The inside sealed chamber that is provided with of handle, install a set of parallel sealing ring in the sealed chamber, the sealed chamber uses the sealing ring to divide into the three-section as the boundary, and wherein the anterior segment that is close to the cutting head is supplementary air chamber an, and the middle section is piston chamber b, and the back end that is close to the handle afterbody is the negative pressure and connects chamber c, and the size of piston chamber b is greater than supplementary air chamber a and the size that chamber c is connected to the negative pressure.

The reversing valve is arranged in the sealing cavity, the reversing valve is arranged in the piston cavity b, the reversing valve is provided with extension sections towards the auxiliary air chamber a and the negative pressure connecting cavity c at two ends, the reversing valve and the extension sections thereof are matched with the sealing cavity, and the extension sections of the reversing valve and the sealing ring form a sealing structure to isolate the gas circulation of the auxiliary air chamber a, the piston cavity b and the negative pressure connecting cavity c.

The handle is also provided with a feed air path and a feed air path, the feed air path is communicated with the lower side of the piston cavity b, and the feed air path is communicated with the upper side of the piston cavity b.

A discharge channel is arranged in the middle of the reversing valve, one end of the discharge channel is communicated with the cutting head, and the other end of the discharge channel is communicated with the negative pressure connecting cavity c.

The handle also comprises a negative pressure interface which is communicated with the negative pressure connecting cavity c.

The cutting head comprises a cutter sleeve, a cutter core and a composite outer pipe, wherein a cutter edge is formed at the front end of the cutter sleeve, the composite outer pipe is arranged on the outer side of the cutter sleeve, an auxiliary air channel communicated with an auxiliary air chamber a is arranged in the composite outer pipe, the other end of the auxiliary air channel is arranged on the upper side of the cutter edge, the cutter core is sleeved in the cutter sleeve, the inner end of the cutter core is fixedly connected on a reversing valve, a connecting channel is arranged in the cutting head, and the cutter edge is communicated with a drainage channel through the connecting channel.

The utility model further provides a vitreous body cutting is with glass crop head, the gas outlet of assisting the gas passageway is located the upside of the edge of a knife that the broach shell set up, and the gas outlet downward sloping of assisting the gas passageway is towards the edge of a knife.

The utility model further provides a vitreous cutting head is used in vitreous cutting, the rear end of handle is provided with a set of air pipe interface, and air pipe interface feeds through back feed gas circuit and feed gas circuit respectively, provides alternate positive pressure air supply for back feed gas circuit and feed gas circuit through the air pipe interface connection air supply.

The utility model further provides a vitreous cutting head is used in vitreous cutting, the sword core is an annular sword section of thick bamboo, and the tool bit inboard of an annular sword section of thick bamboo sets up the diagonal tangent plane.

The utility model further provides a vitreous cutting head is used in vitreous cutting, switching-over valve downwardly extending section be provided with the pullover, the sword core passes through the pullover suit to be fixed on the switching-over valve.

The utility model further provides a vitreous cutting head is used in vitreous cutting, the broach shell has outer port side opening and inclined plane formula blind end.

The utility model further provides a vitreous cutting head is used in vitreous cutting, the length of cutting head is cm at least.

The utility model further provides a vitreous cutting head is used in vitreous cutting, sealed chamber is the T type, switching-over valve and sealed chamber phase-match, and the supplementary air chamber an and the negative pressure at one of them side direction sealed chamber both ends of switching-over valve are connected chamber c and are extended, and the inside that the switching-over valve extended position sets up and excretes the passageway, and the air circuit of cutting back and feed air circuit set up in same one side of excreting the passageway to it is corresponding that the air outlet that air circuit of cutting back and feed air circuit lie in piston chamber b both sides.

The utility model further provides a vitreous body cutting is with glass crop head, the outer end of back feed gas circuit and feed gas circuit is through the air pipe connection intercommunication positive pressure air supply in turn that has parallel interface.

The utility model further provides a vitreous body cutting is with glass crop head, the compound outer tube suit of cutting head is provided with anti-skidding coating in the pullover, on the contact surface of compound outer tube and pullover.

The beneficial effects of the utility model

Through the technical scheme, the utility model is provided with a knife edge on the cutting head of the device, and the knife edge is communicated with the inner cavity of the cut tissue; the cutting head can move forwards and backwards or rotate under the power supply or thought operation of the device, the cutting part is accurately controlled to carry out the miniature cutting of the vitreous body, when an external negative pressure device works, the inner cavity of a cutting tissue forms a negative pressure environment, the vitreous body and a lens nucleus adhered with a computerized film or a blood clot are cut up, and the vitreous body and the lens nucleus are sucked into a knife edge under the action of surface tension and negative pressure suction force and then enter a storage bin of the device. The device cutting efficiency is high, can carry out the accurate operation of miniaturization, greatly increased the suction effect of pathological change tissue, improved the success rate of clinical operation and had good healing.

Compared with the prior glass cutter, the utility model has the advantages that in the reciprocating motion process of the glass cutter, the lower end of the reciprocating mechanism discharges and sucks gathered gas through the auxiliary gas channel, so that the reverse acting force generated on the reciprocating mechanism by the enclosed gas is avoided when the reciprocating mechanism moves in a sealed state, the operation efficiency of the glass cutter is improved, and the energy consumption is reduced; meanwhile, the auxiliary air channel is used for pushing the sealed air to the position of the knife edge, a two-way effect is provided for the cutting of the pathological change tissue, the drainage channel provides new positive pressure supplement for the air exhausted by the auxiliary air channel under the action of original negative pressure, positive pressure is provided for the pathological change tissue, the pathological change tissue is tightly attached to the knife edge, and the pathological change tissue is prevented from being separated in the cutting process.

Drawings

Fig. 1 is a schematic view of the appearance structure of the present invention.

Fig. 2 is a schematic sectional view of the handle of the present invention.

Fig. 3 is a schematic view of the overall cross-sectional structure of the present invention.

Fig. 4 is a partial sectional view of the connection portion of the cutting head and the handle of the present invention.

Fig. 5 is a schematic sectional structure view of the cutting head of the present invention.

Figure 6 is a cross-sectional view of another embodiment of a cutting head end of the present invention.

Fig. 7 is a schematic view of the appearance structure of the change valve of the present invention.

Fig. 8 is a cross-sectional view of a handle according to another embodiment of the present invention.

Fig. 9 is a schematic structural view of mounting the balance buffering mechanism.

Fig. 10 is a cross-sectional structural schematic view of the balance buffering mechanism.

FIG. 11 is a cross-sectional structural view of yet another embodiment.

Reference numbers in the figures: the cutting tool comprises a handle 1, a cutting head 2, a sealing cavity 101, an auxiliary air chamber a, a piston cavity b, a negative pressure connecting cavity c, a sleeve head 102, a sealing ring 103, a knife return air passage 104, a knife feed air passage 105, a negative pressure interface 106, a reversing valve 107, a drainage passage 108, a knife sleeve 201, a knife core 202, a composite outer tube 203, an auxiliary air passage 204, a ball 301, a spiral groove 302, a balance buffer mechanism 401, a connecting sleeve 402, a movable sleeve 403 and an elastic piece 404.

Detailed Description

Example 1: the vitreous cutting operation means that turbid vitreous or lesion vitreous is cut away by means of operation so as to recover the permeability of light, or vitreous is cut away, so that the dragging of the vitreous to the retina is relieved or relieved, so that the retina disease is treated, and the visual function of a patient is recovered. The vitrectomy is very widely used in clinical practice, where the surgical field involves almost the entire eyeball. The vitrectomy head used by the existing vitrectomy cutter is generally reciprocating, and the diseased vitreous body is cut off by the relative motion of the inner tube and the outer tube and then is sucked away for treatment, but the efficiency is often low, and meanwhile, the vitreous nucleus adhered to tissues such as a computerized film, a blood clot and the like is difficult to be sucked into a vitrectomy head lumen, so that the conditions of incomplete treatment, poor healing and the like are caused. The existing double-tube type and high-frequency type vitrectomy heads have low clinical utilization rate due to the conditions that the design is complex, the volume is too large, micro-cutting cannot be carried out, high-frequency vibration easily causes contusion to a vitreous body and the like.

The existing reciprocating type glass cutting head generally uses positive air pressure to push a piston to reciprocate, and because the glass cutting head and the existing reciprocating type glass cutting head generally adopt a closed structure, the lower end of the piston can form a part of gas gathering or a cavity, and the part of gas or the cavity needs to be continuously compressed or stretched in the reciprocating motion process of the piston, so that the overall efficiency of the reciprocating motion is poor and more energy consumption is needed; if an open structure is adopted, the piston continuously reciprocates to cause the gas at the lower end of the piston to continuously blow and suck to generate reciprocating airflow, and the operation is performed in an image operation place.

Be full of liquid tissue in the vitreous body, when relying on the negative pressure suction to cut, the intensity is absorb to the negative pressure ground has strict restriction, the negative pressure is too strong and arouses the tissue to absorb too fast easily, thereby influence the internal pressure unbalance of vitreous body and lead to the fact more serious consequence, the pathological change tissue in less negative pressure to the absorption effort ratio than the vitreous body of pathological change tissue is mostly flexible tissue, only rely on suction that the negative pressure provided and the cutting effect that the interior outer tube of glass cutter stings each other unsatisfactory, be difficult to cut off flexible pathological change tissue, lead to the operation effect unsatisfactory, the operation efficiency is lower.

In view of the above problem, the utility model provides a cutting head has compound outer tubular construction's vitreous body cutting of ophthalmology to use glass cutting head, as shown in fig. 1, the glass cutting head includes handle 1 as the vitreous cutting head main part and the cutting head 2 as the cutting tissue, cutting head 2 set up in the front end of handle 1 as the main part, cutting head 2 is provided with the passageway that is used for absorbing the pathological change tissue after the cutting of intercommunication with the inside of handle 1 of main part and accomodates.

As shown in fig. 2 and 3, the handle 1 comprises a sleeve head 102 and a reversing valve 107, wherein the sleeve head 102 is mounted at the front end of the handle, the cutting head 2 is mounted on the handle through the sleeve head 102, a sealed cavity 101 is arranged inside the handle 1 for mounting the reversing valve 107, and the reversing valve 107 is fittingly sleeved in the sealed cavity 101.

A group of parallel annular grooves are formed in the sealing cavity 101, an annular sealing ring 103 is installed through the annular grooves, meanwhile, the sealing cavity 101 is divided into three sections by taking the sealing ring 103 as a boundary, the front section close to the cutting head 2 is an auxiliary air chamber a, the middle section is a piston cavity b, the rear section close to the tail part of the handle is a negative pressure connecting cavity c, and the size of the piston cavity b is larger than that of the auxiliary air chamber a and the negative pressure connecting cavity c.

The reversing valve 107 is sleeved in the piston cavity b and moves up and down along the piston cavity b, a knife return air passage 104 and a knife feed air passage 105 which are respectively communicated with the piston cavity b are further arranged in the handle 1, wherein the knife return air passage 104 is communicated with the lower side of the piston cavity b, the knife feed air passage 105 is communicated with the upper side of the piston cavity b, and forward air pressure is alternately introduced into the knife return air passage 104 and the knife feed air passage 105 to push the reversing valve 107 to reciprocate along the piston cavity b.

Meanwhile, the reversing valve 107 symmetrically extends towards the auxiliary air chamber a and the negative pressure connecting cavity c which are positioned on two sides of the piston cavity b to respectively form extension sections matched with the auxiliary air chamber a and the negative pressure connecting cavity c, the extension sections and the sealing rings 103 which are installed in the sealing cavities in parallel are abutted together to form a sealing structure, so that the auxiliary air chamber a, the piston cavity b and the negative pressure connecting cavity c are isolated into three independent cavities with different air flows, the extension sections which are matched with each other simultaneously provide limit for the reversing valve 107, and the reversing valve is ensured to perform linear reciprocating motion.

The tail end of handle 1 sets up negative pressure joint 106, and cavity c is connected to negative pressure joint 106 intercommunication negative pressure, connects negative pressure equipment through negative pressure joint 106 and provides the negative pressure for the head is cut to the cutting head 2 absorbs pathological change tissue and cuts.

The middle of the reversing valve 107 is provided with a through drainage channel 108, one end of the drainage channel 108 is communicated with the cutting head 2 installed at the front end of the handle, the other end of the drainage channel 108 is communicated with the negative pressure connecting cavity c, the negative pressure is transmitted to the cutting head 2 through the drainage channel 108, and meanwhile, the cut pathological tissues are sucked through the negative pressure and are discharged into a containing bin of the equipment through the drainage channel.

As shown in fig. 4 and 5, the cutting head 2 includes a cutter sleeve 201, a cutter core 202 and a composite outer tube 203, wherein a cutter edge is formed at the front end of the cutter sleeve 201, the cutter core 202 is installed in the cutter sleeve 201 of the cutting head, the cutter core 202 and the cutter sleeve 201 move relatively in the axial direction, the inner end of the cutter core 202 is connected and fixed on the reversing valve 107, the cutter core 202 reciprocates along with the reversing valve 107, the cutter edge of the cutter core 202 is attached to the cutter edge of the cutter sleeve, the cutter edge is quickly sheared by the cutter edge in the reciprocating process, the cutter core 202 is of a tubular structure, the tubular inner cavity of the cutter core 202 is communicated with the drainage channel 108, the composite outer tube 203 is arranged outside the cutter sleeve 201, an auxiliary air channel 204 communicated with the auxiliary air chamber a is arranged in the composite outer tube 203, and the other end of the auxiliary air channel 204 is arranged at the upper side of the cutter edge.

The tail end of the drainage channel is connected with a negative pressure passage; the reversing valve is fixed with the cutter core structure, when the drainage channel is communicated with negative pressure, the cutter return air path 104 and the cutter feed air path 105 are communicated with alternate positive pressure air sources, and at the moment, the cutter core and the cutter sleeve form shearing action. Press close to the incision and wait to cut off the tissue, in the sword core returns the instant tissue of back and is inhaled to the incision, when the sword core advances with the tissue excision, the tissue of excision is inhaled to the tubulose inner chamber of sword core simultaneously in, and then is inhaled the drainage channel by the negative pressure, arrange in equipment storage bin afterwards.

In the cutting process, the reversing valve 107 extends into the extension section of the auxiliary air chamber a and pushes and sucks the gas in the auxiliary air chamber a, when the reversing valve pushes the cutter core to advance for cutting, the extension section pushes the gas in the auxiliary air chamber a to be discharged through the auxiliary gas channel 204, and the discharged gas generates pressure to press the pathological change tissue on the side wall of the cutter edge, so that the pathological change tissue can be conveniently cut in the advancing process of the cutter core; when the reversing valve pushes the knife core to retreat to suck the lesion tissue, the extension section sucks in the auxiliary air chamber a at the same time to suck the exhausted gas back again.

Compared with the prior glass cutter, the utility model has the advantages that in the reciprocating motion process of the glass cutter, the lower end of the reciprocating mechanism discharges and sucks gathered gas through the auxiliary gas channel 204, so that the reverse acting force generated on the reciprocating mechanism by the enclosed gas is avoided when the reciprocating mechanism moves in a sealed state, the operation efficiency of the glass cutter is improved, and the energy consumption is reduced; meanwhile, the auxiliary air channel 204 is used for pushing the sealed air to the position of the knife edge to provide a bidirectional effect for cutting the pathological tissue, the air exhausted by the auxiliary air channel 204 provides new positive pressure supplement for the drainage channel 108 under the action of original negative pressure, and positive pressure is provided for the pathological tissue, so that the pathological tissue is tightly attached to the knife edge, and the pathological tissue is prevented from being separated in the cutting process.

Example 2: as shown in fig. 11, the seal cavity 101 is T-shaped, the reversing valve 107 is matched with the seal cavity 101, one side of the reversing valve 107 extends to the auxiliary air chamber a and the negative pressure connection cavity c at the two ends of the seal cavity 101, the extension part of the reversing valve 107 is internally provided with a discharge channel 108, the knife return air path 104 and the knife feed air path 105 are arranged at the same side of the discharge channel 108, the knife return air path 104 and the knife feed air path 105 are located at the air outlets at the two sides of the piston cavity b and correspond to each other, and the outer ends of the knife return air path 104 and the knife feed air path 105 are communicated with an alternative positive pressure air source through an air pipe joint with parallel interfaces.

The air outlets of the knife return air passage 104 and the knife feed air passage 105, which are positioned at two sides of the piston cavity b, correspond to each other, and the driving force borne by the reversing valve forms a symmetrical structure in the process of alternately pushing the reversing valve by the alternate positive pressure air source, so that the situation that the reversing valve is subjected to alternate thrust and is inclined in a one-way manner is avoided, the abrasion between the reversing valve and the sealing cavity is reduced, and the durability of the device is improved.

Example 3: when the circular cutter head cuts, pressure is completely utilized for cutting off, the edge part of the circular cutter head is likely to contact with the front wall of the pipe, the edge part is damaged after long-time use, sharpness performance is affected, the circular cutter head can only be a disposable cutter, and the circular cutter head cannot be used repeatedly, so that cost is high.

As shown in fig. 6-8, a circular cutting head of the cutter core 202 is provided with a helical tooth edge along the circumference, the outer wall of the sealed cavity 101 is provided with a small-span helical groove 302, a ball groove is correspondingly arranged on the reversing valve 107, a ball 301 is fittingly sleeved in the ball groove, and the ball 301 is fittingly positioned in the helical groove 302.

When the reversing valve 107 is pushed by the forward air flow alternately provided by the knife-returning air passage 104 and the knife-feeding air passage 105 to perform reciprocating motion, the ball 301 slides along the spiral groove 302, because the spiral groove 302 has a small span, the ball 301 can drive the reversing valve 107 to perform reciprocating rotation in the sliding process, thereby driving the knife core 202 fixedly connected with the reversing valve 107 to perform reciprocating rotation, the linear reciprocating motion provides pressure to cut off, the reciprocating rotation drives the spiral tooth blade to perform transverse shearing and cutting off, the reliability of cutting lesion tissues is improved by dual-action cutting, meanwhile, the damage of the knife blade of the knife core under long-term pressure cutting is avoided by the rotary transverse cutting, the knife blade can keep sharp performance for a longer time, the reuse degree is improved, and the cost is reduced.

Example 4: the knife return air passage 104 and the knife feed air passage 105 alternately pass through positive air pressure, and when the reversing valve 107 moves back and forth along with the alternate positive air pressure, the front and rear walls of the piston cavity b are impacted, and the impact force causes slight vibration of the handle and is unfavorable for operation.

In order to avoid that the reversing valve 107 impacts the front wall and the rear wall of the piston cavity b and reduce the vibration of the handle, as shown in fig. 9-10, a balance buffer mechanism 401 is connected between air pipes providing positive air pressure for the return air passage 104 and the feed air passage 105, the balance buffer mechanism comprises a connecting sleeve 402, a movable sleeve 403 and an elastic piece 404, wherein the connecting sleeve 402 comprises parallel connecting pipes, the connecting pipes are connected through a piston pipe, the movable sleeve 403 is sleeved in the piston pipe in a matching manner, the elastic pieces 404 are symmetrically installed on two sides of the movable sleeve 403, two ends of the piston pipe are provided with limit stop tables, and the elastic piece 404 is installed between the movable sleeve 403 and the limit stop tables.

The connecting pipes on the two sides of the connecting sleeve 402 are respectively arranged on the air pipes which provide positive air pressure for the back-cut air passage 104 and the feed air passage 105, when the air source provides positive air pressure for one side of the back-cut air passage 104 and the feed air passage 105, and when the excessive air pressure passes through the balance buffer mechanism 401, the air flow enters the piston pipe to push the movable sleeve 403 to compress the opposite springs, so that the pressure of the passing air flow is reduced; when alternate air supply, the balance buffer mechanism 401 acts reversely, so that the buffer effect of pressure reduction balance is achieved, and handle vibration caused by direct impact of alternate air pressure on the reversing valve is avoided.

It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A vitreous cutting head for cutting vitreous body in ophthalmology, including hand grip (1) and cutting head (2), the cutting head (2) is fitted on hand grip (1), wherein the front end of the hand grip (1) is fixed with the pullover (102) used for installing the cutting head (2); the cutting tool is characterized in that a sealing cavity (101) is arranged in the handle (1), a group of parallel sealing rings (103) are installed in the sealing cavity (101), the sealing cavity (101) is divided into three sections by taking the sealing rings (103) as boundaries, wherein the front section close to the cutting head is an auxiliary air chamber a, the middle section is a piston cavity b, the rear section close to the tail part of the handle is a negative pressure connecting cavity c, and the size of the piston cavity b is larger than that of the auxiliary air chamber a and the negative pressure connecting cavity c; a reversing valve (107) is arranged in the sealing cavity (101), the reversing valve (107) is arranged in the piston cavity b, meanwhile, the reversing valve (107) has extension sections towards the auxiliary air chamber a and the negative pressure connecting cavity c at two ends, the reversing valve (107) and the extension sections thereof are matched with the sealing cavity (101), and the extension sections of the reversing valve (107) and the sealing ring (103) form a sealing structure to isolate the gas circulation of the auxiliary air chamber a, the piston cavity b and the negative pressure connecting cavity c; a back-cutting air passage (104) and a feed air passage (105) are also arranged in the handle (1), the back-cutting air passage (104) is communicated with the lower side of the piston cavity b, and the feed air passage (105) is communicated with the upper side of the piston cavity b; a discharge channel (108) is arranged in the middle of the reversing valve (107), one end of the discharge channel (108) is communicated with the cutting head (2), and the other end is communicated with the negative pressure connecting cavity c; the handle (1) further comprises a negative pressure interface (106), and the negative pressure interface (106) is communicated with the negative pressure connecting cavity c; the cutting head (2) comprises a cutter sleeve (201), a cutter core (202) and a composite outer pipe (203), wherein a cutter edge is formed at the front end of the cutter sleeve (201), the composite outer pipe (203) is arranged on the outer side of the cutter sleeve (201), an auxiliary air channel (204) communicated with an auxiliary air chamber a is arranged in the composite outer pipe (203), the other end of the auxiliary air channel (204) is arranged on the upper side of the cutter edge, the cutter core (202) is sleeved in the cutter sleeve (201), the inner end of the cutter core (202) is connected and fixed on a reversing valve (107), a connecting channel is arranged in the cutting head (2), and the cutter edge is communicated with a drainage channel (108) through the connecting channel.

2. The vitrectomy head of claim 1, wherein the air outlet of the auxiliary air channel (204) is located on the upper side of the knife edge provided on the knife holder (201), and the air outlet of the auxiliary air channel (204) is inclined downward toward the knife edge.

3. The vitrectomy head of claim 1, wherein the handle (1) is provided at a rear end thereof with a set of air tube ports, the air tube ports are respectively communicated with the knife return air passage (104) and the knife feed air passage (105), and an air source is connected to the air tube ports to provide an alternate positive pressure air source for the knife return air passage (104) and the knife feed air passage (105).

4. The vitrectomy head of claim 1, wherein the cutting core (202) is an annular cutting cylinder, and the inner side of the cutting head of the annular cutting cylinder is provided with an oblique cutting surface.

5. The ophthalmic vitreous cutting head according to claim 1, wherein the downward extending section of the reversing valve (107) is provided with a sleeve head, and the cutter core (202) is fixed on the reversing valve (107) through the sleeve head.

6. A vitrectomy head according to claim 1, wherein the sleeve (201) has an outer port side opening and a beveled closed end.

7. A vitrectomy head according to claim 1, wherein the cutting head (2) has a length of at least 8 cm.

8. The vitrectomy head of claim 1, wherein the sealed cavity (101) is T-shaped, the reversing valve (107) is matched with the sealed cavity (101), one of the reversing valves (107) extends towards the auxiliary air chamber a and the negative pressure connecting chamber c at two ends of the sealed cavity (101), a drainage channel (108) is arranged inside the extending part of the reversing valve (107), the knife return air path (104) and the knife feed air path (105) are arranged on the same side of the drainage channel (108), and the air outlets of the knife return air path (104) and the knife feed air path (105) on two sides of the piston cavity b correspond to each other.

9. The vitrectomy head according to claim 8, wherein the outer ends of the air return path (104) and the air feed path (105) are connected to an alternating positive pressure air source through air tube connectors having parallel ports.

10. The vitrectomy head of claim 1, wherein the composite outer tube (203) of the cutting head (2) is sleeved in the cuff (102), and an anti-slip coating is disposed on the contact surface of the composite outer tube (203) and the cuff (102).

Images