Combined atherosclerosis rotary cutter

Abstract

The utility model belongs to the technical field of medical instruments, and discloses a combined atherosclerosis rotary cutter which comprises a rotary cutting assembly and a main body assembly. The rotary cutting assembly comprises a first straight gear, a plug-in shaft, a plug-in shell, a first deep groove ball bearing, an O-shaped sealing ring, a synchronous rope sleeve, an annular check ring, a synchronous rope, a winding spring, a guide catheter, a catheter rear seat, a guide wire, a rotary cutting tool bit, a catheter front seat, a Luer connector and a first clamping spring. The problems that in the prior art, medical instruments are high in cost and limited in operation flexibility are solved, due to the fact that the instruments need to be integrally replaced, especially the integrated power module and precise transmission component are high in cost, operation cost is remarkably increased, functional modules of disposable instruments are difficult to adjust according to requirements in an operation, tool bits of different sizes cannot be replaced, and operation cost is reduced. The accuracy and the adaptability of the operation are possibly influenced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of medical apparatus and instruments, and particularly relates to a combined atheromatous rotary cutter. BACKGROUND

[0002] In the treatment of peripheral arterial disease, the removal of intravascular hardened plaque often adopts rotary cutting or grinding cutting technology. The typical operation process is as follows: the rotary cutting or grinding instrument is delivered to the blood vessel lesion site through a guide wire, the plaque is mechanically removed by using a high-speed rotating blade or grinding head, and the plaque debris is removed by a built-in collection cavity or suction device of the instrument. Such instruments are usually designed as disposable, that is, the whole set of device including the rotary cutting assembly, transmission structure, driving motor and shell is discarded as a whole after single use.

[0003] Main defects of the prior art:

[0004] 1. High cost: since the instrument needs to be replaced as a whole, especially the integrated power module and precise transmission components, the cost is high, which significantly increases the surgical cost;

[0005] 2. Limited operation flexibility: the disposable instrument cannot adjust the function module according to the intraoperative requirements, and cannot replace the different size cutting heads, which may affect the surgical precision and adaptability.

[0006] Therefore, we propose a combined atheromatous rotary cutter. CONTENT OF THE UTILITY MODEL

[0007] To solve the problems proposed in the above background art, the utility model provides a combined atheromatous rotary cutter, which has the advantages of low use cost and convenient replacement of different size cutting heads, and improves the surgical precision and adaptability.

[0008] To achieve the above purpose, the utility model provides the following technical scheme: a combined atheromatous rotary cutter, comprising a rotary cutting assembly and a main body assembly, the rotary cutting assembly comprises a first straight gear, an insert shaft, an insert shell, a first deep groove ball bearing, an O-shaped sealing ring, a synchronous rope sleeve, an annular retainer ring, a synchronous rope, a spring, a guide catheter, a catheter rear seat, a guide wire, a rotary cutting head, a catheter front seat, a luer connector and a first circlip;

[0009] The guide catheter, catheter rear seat, catheter front seat, rotary cutting head, spring and synchronous rope together realize the rotary cutting function, the rotary cutting head body has a through hole in the inside, and the guide wire penetrates through the through hole, and the rotary cutting head body protruding portion is axially clamped by the catheter front seat and the catheter rear seat;

[0010] The outer side of one end of the synchronous rope is sleeved with a synchronous rope sleeve, the other end of the synchronous rope is inserted into the blind hole at the bottom of the rotary cutting head, and the synchronous rope is externally wound with a spring;

[0011] The guide catheter is the outermost part of the front end of the rotary cutting assembly, and the material is PTFE. One end of the guide catheter is inserted into the plug-in shell, and the other end of the guide catheter is inserted into the catheter rear seat.

[0012] Preferably, the plug-in shaft, the first spur gear, the first deep groove ball bearing, the first circlip and the O-shaped sealing ring constitute a transmission function. The first spur gear is sleeved in the plug-in shaft, and the first circlip is used for fixing. The plug-in shaft is sleeved with the first deep groove ball bearing at both ends. A blind hole is formed at one end of the plug-in shaft, and the synchronous rope sleeve is inserted into and bonded with the inner wall of the blind hole of the plug-in shaft.

[0013] Preferably, the main body assembly comprises a second spur gear, a DC brushless motor, a metal spring, an aviation plug, a U-shaped locking ring, a second deep groove ball bearing, a nut, a positioning pin, a trigger, a second circlip, a motor shaft sleeve, a handle shell, a spring and a tension spring.

[0014] The DC brushless motor, the motor shaft sleeve, the metal spring, the aviation plug, the positioning pin, the trigger and the tension spring together constitute a power function. The handle shell is fixed with the DC brushless motor through screws. The outer side of the motor shaft is sleeved with the motor shaft sleeve. The second deep groove ball bearing and the second circlip are sleeved at the end to realize fastening. The second spur gear is sleeved on the motor shaft sleeve and engaged with the first spur gear in the rotary cutting assembly.

[0015] Preferably, the DC brushless motor is fixed with two power lines at the end. One end of the power line is fixed with the aviation plug, and the other end of the other power line is fixed with the metal spring. The metal spring is embedded in the groove in the handle shell.

[0016] Preferably, two positioning pins are fixed in the handle shell, and the trigger is inserted into the handle shell through the positioning pins. One end of the trigger is provided with a tension spring, and the other end of the tension spring is connected with the other positioning pin. The trigger is inserted with a protruding power line, and the other end of the power line is connected with the aviation plug.

[0017] Preferably, the U-shaped locking ring, the handle shell, the spring and the plug-in shell together constitute a hot plug function. The U-shaped locking ring is in the shape of "U" and has a column structure on both sides. The column has an inclined groove inside, and the column has a plane outside.

[0018] The handle shell has a groove inside, and the column on the outside of the U-shaped locking ring is embedded in the groove. The U-shaped locking ring moves in the vertical direction inside the groove. The bottom of the U-shaped locking ring is connected with the boss on the handle shell through the spring, and the U-shaped locking ring is lifted by the spring in the normal state.

[0019] Preferably, the insert shell is provided with a symmetric long strip outside, and the long strip is divided into three areas: a semi-cylindrical section, a hollow section and a long strip section, and the long strip section is mainly used for guiding and limiting the insert shell when it is inserted into the handle shell.

[0020] Compared with the prior art, the utility model has the advantages that:

[0021] 1. The cost-effectiveness is significantly improved: by modularizing the rotary cutting function into a detachable independent rotary cutting assembly, the high-value power module and the precision transmission assembly are separated from the disposable rotary cutting assembly, and only the rotary cutting assembly needs to be replaced for a single surgery, thereby reducing the surgical cost.

[0022] 2. The operation flexibility is enhanced: the hot plug structure supports quick replacement of the rotary cutting assembly during surgery, and medical staff can flexibly select rotary cutting heads of different specifications according to the blood vessel conditions and plaque characteristics, thereby improving the surgical adaptability and accuracy. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is an appearance structure diagram of the atherosclerotic rotary cutter.

[0024] Figure 2 It is a sectional view of the atherosclerotic rotary cutter.

[0025] Figure 3 It is a sectional view of the rotary cutting assembly.

[0026] Figure 4 It is a local enlarged view of the rotary cutting assembly.

[0027] Figure 5 It is a rotary cutting head diagram.

[0028] Figure 6 It is a hot plug part structure diagram.

[0029] In the drawings:

[0030] Rotary cutting assembly; 101, first straight gear; 102, insert shaft; 103, insert shell; 104, first deep groove ball bearing; 105, O-shaped sealing ring; 106, synchronous rope sleeve; 107, annular retainer; 108, synchronous rope; 109, around spring; 110, guide catheter; 111, catheter rear seat; 112, guide wire; 113, rotary cutting head; 114, catheter front seat; 115, luer connector; 116, first snap spring;

[0031] 2. Main components; 201. Second spur gear; 202. DC brushless motor; 203. Metal spring; 204. Aviation connector; 205. U-shaped locking ring; 206. Second deep groove ball bearing; 207. Nut; 208. Locating pin; 209. Trigger; 210. Second snap ring; 211. Motor bushing; 212. Handle housing; 213. Spring; 214. Tension spring. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0033] like Figures 1 to 5 As shown, this utility model provides a combined atherosclerosis scalpel cutter, including a scalpel cutter assembly 1 and a main body assembly 2. The scalpel cutter assembly 1 includes a first spur gear 101, a plug shaft 102, a plug housing 103, a first deep groove ball bearing 104, an O-ring seal 105, a synchronization rope sleeve 106, an annular retaining ring 107, a synchronization rope 108, a coiled spring 109, a guiding catheter 110, a catheter rear seat 111, a guide wire 112, a scalpel cutter head 113, a catheter front seat 114, a Luer connector 115, and a first retaining ring 116.

[0034] The guiding catheter 110, catheter rear seat 111, catheter front seat 114, rotary cutting head 113, coiled spring 109 and synchronization rope 108 work together to realize the rotary cutting function. The front edge of the rotary cutting head 113 has a large curvature arc edge, which is used to cut and break up sclerotic plaques in blood vessels. The blade body is spiral-shaped, which is used to expel sclerotic plaque debris backward. The rotary cutting head 113 has a through hole inside the blade body, and the guide wire 112 passes through the through hole. The protrusion on the blade body of the rotary cutting head 113 is axially clamped by the catheter front seat 114 and catheter rear seat 111, with a small gap, which can limit the axial movement of the cutting head between the catheter front seat 114 and catheter rear seat 111, and also ensure the coaxiality of the cutting head with the ideal rotation center axis during rotation.

[0035] A timing rope sleeve 106 is fitted on the outer side of one end of the timing rope 108. The timing rope 108 is made of twisted multiple strands of stainless steel wire. The other end of the timing rope 108 is inserted into the blind hole at the bottom of the rotary cutter head 113 to transmit the torque of the insert shaft 102 to the rotary cutter head 113. A coiled spring 109 is wrapped around the outside of the timing rope 108 to convey the hardened patches shredded by the cutter head backward.

[0036] The guide catheter 110 is the outermost part of the front end of the rotary cutting assembly 1, and the material is PTFE, which can ensure the smoothness of entering the blood vessel. One end of the guide catheter 110 is inserted into the plug-in housing 103, and the other end of the guide catheter 110 is inserted into the catheter rear seat 111.

[0037] Specifically, the plug-in shaft 102, the first straight gear 101, the first deep groove ball bearing 104, the first circlip 116 and the O-shaped sealing ring 105 constitute a transmission function. The first straight gear 101 is sleeved on the plug-in shaft 102, and the first circlip 116 is used for fixing. The plug-in shaft 102 is sleeved with the first deep groove ball bearing 104 at both ends to ensure the rotation accuracy. A blind hole is formed at one end of the plug-in shaft 102, and the synchronous rope sleeve 106 is inserted into and bonded with the inner wall of the blind hole of the plug-in shaft 102 to provide torque for the rotary cutting head 113. During the rotary cutting process, hardened plaque debris and blood are discharged backward through the synchronous rope 108 and the coil spring 109 into the sealed cavity of the rotary cutting assembly 1. In the sealed cavity, the hollow annular retaining ring 107 blocks the debris from moving backward, and a luer connector 115 is provided below. The connector can be externally connected to a suction device to assist in discharging hardened plaque and debris from the body. The O-shaped sealing ring 105 in the middle of the rotary cutting assembly 1 ensures water tightness, so that hardened plaque debris and blood do not contaminate the reusable main assembly 2.

[0038] Further, the main assembly 2 includes a second straight gear 201, a brushless DC motor 202, a metal spring 203, an aviation plug 204, a U-shaped locking ring 205, a second deep groove ball bearing 206, a nut 207, a positioning pin 208, a trigger 209, a second circlip 210, a motor shaft sleeve 211, a handle housing 212, a spring 213 and a tension spring 214.

[0039] The brushless DC motor 202, the motor shaft sleeve 211, the metal spring 203, the aviation plug 204, the positioning pin 208, the trigger 209 and the tension spring 214 collectively constitute a power function. The handle housing 212 is fixed with the brushless DC motor 202 by screws. The brushless DC motor 202 is the power source, and its rotating speed can be 4000-50000 RPM. It is installed in the handle housing 212 and is fixed by the inner rib of the housing. The outer side of the motor shaft is sleeved with the motor shaft sleeve 211, and the second deep groove ball bearing 206 and the second circlip 210 are sleeved at the end to realize fastening. The second straight gear 201 is sleeved on the motor shaft sleeve 211 and meshes with the first straight gear 101 in the rotary cutting assembly 1. When the motor shaft rotates, it drives the first straight gear 101 in the rotary cutting assembly 1 to rotate, thereby transmitting torque to the rotary cutting head 113 to achieve the rotary cutting effect.

[0040] Further, the DC brushless motor 202 is fixed with two power supply lines at the end, one end of one power supply line is fixed with the aviation plug 204, and the other end of the other power supply line is fixed with the metal spring 203, and the metal spring 203 is embedded in the groove in the handle shell 212, and the groove is also used as a direction limit of the trigger 209.

[0041] It is worth mentioning that the handle shell 212 is fixed with two positioning pins 208, and the trigger 209 is inserted into the handle shell 212 through the positioning pins 208, one end of the trigger 209 is provided with a tension spring 214, the other end of the tension spring 214 is connected with the other positioning pin 208, the trigger 209 is inserted with a power supply line, and the other end of the power supply line is connected with the aviation plug 204, the tension spring 214 is in a pre-tension state in normal state, when the trigger 209 is pulled, the power supply line in the trigger 209 is connected with the metal spring 203, and reaches the limit, the circuit forms a path, and the shaft of the DC brushless motor 202 starts to rotate, when the trigger 209 is released, the path is disconnected under the action of the tension spring 214, and the trigger 209 returns to the normal limit.

[0042] It is worth noting that the U-shaped locking ring 205, the handle shell 212, the spring 213 and the plug shell 103 together constitute a hot plug function, the U-shaped locking ring 205 is in the shape of "U", and the two sides have a column structure, the inside of the column is provided with an inclined groove, and the outside of the column is a plane.

[0043] The inside of the handle shell 212 is provided with a groove, and the column on the outside of the U-shaped locking ring 205 is embedded in the groove, and the U-shaped locking ring 205 moves in the vertical direction in the groove, the bottom of the U-shaped locking ring 205 is connected with the boss on the handle shell 212 through the spring 213, and the U-shaped locking ring 205 is lifted by the spring 213 in normal state.

[0044] It is worth mentioning that the plug shell 103 is provided with a symmetrical long strip on the outside, and the long strip is divided into three regions: a semicircular cylinder segment, a hollow segment and a long strip segment, and the long strip segment is mainly used for guiding and limiting the plug shell 103 when it is inserted into the handle shell 212, when the plug shell 103 is inserted into the handle shell 212, the semicircular cylinder segment presses down the U-shaped locking ring 205, when the plug shell 103 moves to the hollow segment, the U-shaped locking ring 205 returns to the original position under the action of the spring 213, and the plug shell 103 is clamped, at this time, the second straight gear 201 in the handle shell 212 is engaged with the first straight gear 101 in the plug shell 103; when the U-shaped locking ring 205 is pressed down, the plug shell 103 can be pulled out by hand, and the hot plug function is realized.

[0045] Wherein, the direct current brushless motor 202 is prior art, and will not be described repeatedly; meanwhile, the utility model also includes power supply, controller and switch, which are not the main technical points of the patent, and will not be described repeatedly; the "front, rear, left and right" visual angle of the device is taken as the reference. Figure 1 The drawing direction is the reference.

[0046] Working principle:

[0047] S1: preoperative preparation stage

[0048] 1, equipment detection

[0049] The main body assembly 2 is connected to the special power supply through the aviation plug 204, the input voltage is 12V DC, the trigger 209 is pulled to start the direct current brushless motor 202, the gear set running state is detected, the no-load speed is 4000~50000RPM ±5%, and it is confirmed that there is no jamming phenomenon; it is confirmed that the U-shaped locking ring 205 is in the reset state, and it is ensured that the hot plug mechanism functions normally; the disposable rotary cutting assembly 1 is taken, physiological saline is injected into it through the Luer connector 115 syringe, the synchronous rope 108 and the inner wall of the guide catheter 110 are cleaned, and it is confirmed that the physiological saline can only flow out from the head end of the rotary cutter head 113, the sealing property of the O-shaped sealing ring 105 is verified, and the first straight gear 101 in the rotary cutting assembly 1 is lightly stirred by hand, and it is confirmed that there is no jamming phenomenon.

[0050] 2, assembly assembly

[0051] The outside guide long strip of the disposable rotary cutting assembly 1 is aligned with the groove of the handle shell 212, the error tolerance is ±0.2mm, the main body assembly 2 is stably inserted in the axial direction, when the semicylindrical segment of the plug-in shell 103 contacts the U-shaped locking ring 205, the insertion is continued until the locking mechanism emits a "click" sound, and the insertion time is <3 seconds; and the Luer connector 115 in the rotary cutting assembly 1 is connected with the suction device, and is used to assist in suction of plaque debris.

[0052] S2: intraoperative operation stage

[0053] 1, guide wire 112 positioning

[0054] The 0.014-inch guide wire 112 is percutaneously punctured and placed into the lesion blood vessel section, the other end of the guide wire 112 is inserted into the center through hole of the rotary cutter head 113, it is ensured that the guide wire 112 is led out from the "L" type plane of the catheter rear seat 111, and the length exposed outside the instrument is ≥150 mm;

[0055] 2, plaque rotary cutting

[0056] The push guide catheter 110 reaches the proximal end of the plaque along the guide wire 112, the trigger 209 is triggered to start the direct-current brushless motor 202, the rotating speed can be 4000-50000 RPM, the rotary cutting head 113 is controlled to rotate to cut the hardened plaque, and the plaque debris enters the sealed cavity through the gap between the spring 109 and the guide catheter 110, and the plaque debris is sucked out through the luer connector 115.

[0057] S3: postoperative treatment stage

[0058] 1, component exit

[0059] In the state of maintaining negative pressure suction, the guide wire 112 and the rotary cutting assembly 1 are withdrawn synchronously, the U-shaped locking ring 205 is pressed to the bottom, and the component disassembly is completed by holding the anti-slip groove of the plug-in shell 103 with one hand.

[0060] 2, preparation for repeated use

[0061] The contact surface of the main assembly 2 is wiped with medical-grade ethanol.

[0062] S4: intraoperative quick replacement process of the rotary cutting head

[0063] When the rotary cutting head needs to be replaced due to complex plaque: repeat the second step of component assembly in step S1, select a new rotary cutting assembly 1, and repeat steps S2-S3 to continue the operation, and the total interruption time is less than 30 seconds.

[0064] It should be noted that the relational terms such as first and second and the like in the present text are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include" and "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device.

[0065] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A combined atherosclerosis rotary cutter, comprising a cutting component (1) and a main component (2), characterized in that: The rotary cutting assembly (1) includes a first spur gear (101), a plug shaft (102), a plug housing (103), a first deep groove ball bearing (104), an O-ring seal (105), a synchronous rope sleeve (106), an annular retaining ring (107), a synchronous rope (108), a coiled spring (109), a guide tube (110), a guide tube rear seat (111), a guide wire (112), a rotary cutting head (113), a guide tube front seat (114), a Luer connector (115), and a first retaining ring (116). The guide tube (110), the rear seat of the guide tube (111), the front seat of the guide tube (114), the rotary cutting head (113), the coiled spring (109), and the synchronous rope (108) together realize the rotary cutting function. The rotary cutting head (113) has a through hole inside the blade body, and the guide wire (112) passes through the through hole. The protrusion of the blade body of the rotary cutting head (113) is axially clamped by the front seat of the guide tube (114) and the rear seat of the guide tube (111) fitting together. The synchronization rope (108) has a synchronization rope sleeve (106) on one side and the other end of the synchronization rope (108) is inserted into the blind hole at the bottom of the rotary cutter head (113). The synchronization rope (108) is wrapped with a spring (109). The guiding conduit (110) is the outermost part of the front end of the rotary cutting assembly (1) and is made of PTFE. One end of the guiding conduit (110) is inserted into the plug housing (103), and the other end of the guiding conduit (110) is inserted into the conduit seat (111).

2. The combined atherosclerosis rotary cutter according to claim 1, characterized in that: The insert shaft (102), the first spur gear (101), the first deep groove ball bearing (104), the first snap ring (116), and the O-ring seal (105) form a transmission function. The first spur gear (101) is sleeved in the insert shaft (102), and the first snap ring (116) is used for fixation. The insert shaft (102) is fitted with the first deep groove ball bearing (104) at both ends. A blind hole is opened at one end of the insert shaft (102), and the synchronous rope sleeve (106) is inserted and adhered to the inner wall of the blind hole of the insert shaft (102).

3. The combined atherosclerosis rotary cutter according to claim 1, characterized in that: The main component (2) includes a second spur gear (201), a DC brushless motor (202), a metal spring (203), an aviation plug (204), a U-shaped locking ring (205), a second deep groove ball bearing (206), a nut (207), a positioning pin (208), a trigger (209), a second snap ring (210), a motor bushing (211), a handle housing (212), a spring (213), and a tension spring (214). The DC brushless motor (202), motor bushing (211), metal spring (203), aviation plug (204), positioning pin (208), trigger (209) and tension spring (214) together form the power function. The handle housing (212) is fixed with the DC brushless motor (202) by screws, and the motor bushing (211) is sleeved on the outside of the motor shaft. The second deep groove ball bearing (206) and the second snap ring (210) are fastened at the end. The second spur gear (201) is sleeved on the motor bushing (211) and meshes with the first spur gear (101) in the rotary cutting assembly (1).

4. The combined atherosclerosis rotary cutter according to claim 3, characterized in that: Two power cords are fixedly provided at the end of the DC brushless motor (202). One power cord is fixedly provided with an aviation plug (204) at the other end, and a metal spring (203) is fixedly provided at the other end of the other power cord. The metal spring (203) is fitted into the groove inside the handle housing (212).

5. The combined atherosclerosis rotary cutter according to claim 3, characterized in that: The handle housing (212) is fixedly provided with two positioning pins (208), and the trigger (209) is inserted into the handle housing (212) through the positioning pins (208). One end of the trigger (209) is provided with a tension spring (214), and the other end of the tension spring (214) is connected to another positioning pin (208). The trigger (209) has an exposed power cord inserted inside, and the other end of the power cord is connected to an aviation plug (204).

6. The combined atherosclerosis rotary cutter according to claim 3, characterized in that: The U-shaped locking ring (205), handle housing (212), spring (213) and plug housing (103) together form a hot-swap function. The U-shaped locking ring (205) is U-shaped and has column structures on both sides. The column has an inclined groove inside and the column is flat on the outside. The handle housing (212) has a groove inside, and the post on the outside of the U-shaped locking ring (205) is fitted into the groove. The U-shaped locking ring (205) moves vertically inside the groove. The bottom of the U-shaped locking ring (205) is connected to the boss on the handle housing (212) by a spring (213). Under normal conditions, the U-shaped locking ring (205) is lifted by the spring (213).

7. The combined atherosclerosis rotary cutter according to claim 1, characterized in that: The outer side of the plug-in housing (103) has a symmetrical strip, which is divided into three areas: a semi-cylindrical section, a hollow section, and a long strip section. The long strip section is mainly used for guiding and limiting the plug-in housing (103) when it is inserted into the handle housing (212).

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