CN111345870B

CN111345870B - High-efficiency soft tissue planing device

Info

Publication number: CN111345870B
Application number: CN201811579557.XA
Authority: CN
Inventors: 熊振宏; 李钧; 王建卫; 苑振涛; 申路加; 于睿
Original assignee: Accu Tech Co ltd
Current assignee: Accu Tech Co ltd
Priority date: 2018-12-24
Filing date: 2018-12-24
Publication date: 2021-07-30
Anticipated expiration: 2038-12-24
Also published as: CN111345870A

Abstract

The utility model provides a high-efficient human soft tissue planer, its tool bit design has to the high "viscidity" of soft tissue, has avoided the problem that the soft tissue piece dropped in the planing basically. The driving of the cutter head adopts an intelligently controlled motor and positioning. The water sealing design of the motor rotating shaft ensures low damping and high reliability.

Description

High-efficiency soft tissue planing device

Technical Field

The soft tissue planing device is high-efficiency, intelligent-driving and high-reliability and is suitable for the planing operation of the soft tissue of the human body. The application fields are urological operations, benign prostate enucleation planing and planing of other human soft tissues and the like.

Background

For years, the urological surgery, especially the treatment surgery of prostatic hyperplasia, widely adopts a soft tissue planing device, sucks the soft tissue to be smashed into a planing cutting opening area by utilizing suction negative pressure, and sucks out the soft tissue to be smashed out of a human body after smashing. The major products and manufacturers include WOLF brand in Europe (RICHARD WOLF, model Piranha), U.S. department medical laser company, and Hangzhou Haokk optoelectronic device Co., Ltd. The patent CN103989505A of Haoke optoelectronic instruments Inc. discloses a patent in which an enucleation device driving part is connected with an enucleation knife through a knife lock assembly. Another patent CN104887293A discloses a double-channel tissue planer with auxiliary perfusion function to reduce the risk of operation.

On the basis of conventional negative pressure suction and planing, the design details of the various products are different, but the various products have several common problems, one is that although negative pressure suction is adopted in the process of planing the soft tissue, the viscosity of the cutter head to the soft tissue block is insufficient, the target soft tissue block is easy to escape from the cut area, and the operation difficulty and the operation time are greatly increased. Secondly, the motor drive of the tool bit lacks intelligent control, and the motor drive is irrelevant to the change of the planing load, so that the planing device works 'hard', and the tool bit is easy to be blocked. Thirdly, the water sealing problem between the motor rotating shaft and the suction water channel is difficult to realize the long-term reliable water sealing, and the flexible rotation and low resistance of the rotating shaft are also kept.

Aiming at the technical challenges, the high-efficiency soft tissue planer is innovatively designed and achieves good effects.

Disclosure of Invention

It is conventionally recognized that the "viscosity" of the planing tool head to the soft tissue fragments is dependent on the magnitude of the negative pressure suction. However, excessive negative pressure suction is not practical and increases the difficulty and insecurity of operation. Our development has demonstrated that the "viscosity" of the planing tool head to soft tissue fragments is also a great concern with the design of the tool head and the tool teeth shape. Optimization of the height of the top of the inner blade in the blade portion can significantly increase the "stickiness" of the planing blade head to soft tissue fragments. In addition, the conventional toothless outer cutting edge is improved and the gear shaping which has a correlation relation with the gear shaping of the inner cutting edge on specific mechanical parameters is added, so that the gear shaping speed can be accelerated, and the viscosity of soft tissue blocks can be effectively increased. Meanwhile, in the design of the inner cutter pipe diameter, the inner diameter of the cutter head is slightly reduced, so that the distribution of negative pressure suction force at the cutter opening can be improved, and the viscosity of soft tissue blocks can be increased. A large number of practices prove that the improved planing tool bit has the advantages that the problem that the target soft tissue block escapes from the planing tool bit in use is remarkably reduced, the planing speed is increased, and the success rate is obviously improved.

Conventional drives for planing tools employ constant drive voltage and current pulses to the motor. The driving force of the motor is constant, but the load born by the planing tool always changes randomly at large amplitude along with the change of the size and the depth of the planed soft tissue and the sometimes no planing during the planing process, and the operation of the planing tool is obviously unstable and not smooth and is easy to be blocked. The invention adopts intelligent drive to the motor, namely, the drive current or voltage pulse to the motor is automatically fed back and correspondingly changed according to the change of the rotating speed of the motor when the load changes, so as to realize the relatively stable and smooth movement of the planing tool. Meanwhile, when unexpected overload is generated, the feedback control system automatically starts protection and cuts off the drive power supply of the motor. Greatly improves the fluency, operability and safety of the planing operation.

The planing cutter is driven by a motor shaft, perfect water seal must be provided between the rotating motor shaft and the fixed mechanical part of the suction waterway, otherwise the motor can be damaged due to water wetting, and the liquid permeating into the motor part is not easy to sterilize and disinfect, thus being easy to become a pollution source causing cross infection. Meanwhile, the water sealing structure must not hinder the long-time reliable rotation of the motor shaft, and the resistance to the rotation of the motor shaft is small. The conventional soft tissue planer realizes the water sealing of the rotating shaft of the motor by adopting an O-shaped sealing ring. However, in practice, it has been found that it is difficult to achieve a balance between long-term reliable sealing and rotatability (low resistance), the sealing operation varies with time, and the reliable operation has a short life. The invention adopts two unconventional sealing pressing sheets on the motor shaft seal of the planer. The two sealing pressing sheets have specific surface finishments which are different from each other, and are properly pressed with each other, so that water sealing is realized, and meanwhile, the two sealing pressing sheets can easily rotate with each other, and the minimum resistance interference on the rotation of the motor shaft is ensured. The working is stable for a long time and the performance is reliable.

Drawings

Fig. 1, a schematic view of a conventional planer.

Figure 2 is a schematic view of the high efficiency soft tissue planer of the present invention.

Fig. 3 is a schematic view of the shaver head of the present invention.

Fig. 4 is a schematic view of the inner and outer planer teeth of the planer head.

Detailed Description

Fig. 1 is a schematic diagram of a conventional soft tissue planer, in which 010 is a hand-held body part of the planer and a driving motor. The drive motor is driven by a drive power source 012 via a lead 013. 011 is the pivot of driving motor, adopts O shape circle 016 and fixed layer ring 015 to realize water-tight. The water path portion is not particularly relevant to the present invention, and is not shown in the drawing, and 014 denotes a cutter head driven by the driving motor 010.

Figure 2 is a schematic view of the high efficiency soft tissue planer of the present invention. 020 is a handheld main body driving motor. The driving motor or its accessory part has position and rotation speed sensor (not shown), the output position and rotation speed signal is 028, feedback to the drive and control part 022, carry on the intellectual drive to the driving motor 020 through 023 by 022, in case of the great change of planing load, basically keep the driving of the driving motor steady. The driving motor can drive the cutter head 024 to make back-and-forth torsional rotation or continuous rotation to the left or right. Once the sensor senses a bit stuck or an overload, the drive control circuit 022 stops the drive of the drive motor 020 through 023 and sends an alarm signal. The specific implementation of these functions has various schemes, which need not be described in detail.

The axis of rotation of motor 020 is 021. 027 is a piece of water-tight gasket fixed to the negative-pressure suction liquid channel fixing mechanism. The other water sealing sheet is 026, which is tightly fitted and fixed on the rotating shaft 021 of the driving motor, and the pressure between the two sealing sheets can be adjusted by the pressure spring 025 fixed on the motor shaft 021. To ensure a balance between tightness and small rotational resistance. The plane smoothness of the two sealing rotating sheets is another key consideration point, the high smoothness has good sealing performance, but the damping is larger when the two sealing sheets rotate mutually. One piece of the surface finish is generally selected to be Ra0.05-Ra0.3, and the other piece of the surface finish can be poorer, and is about Ra0.3-Ra1.6. The materials of the two rotary sealing sheets can be silicon carbide, graphite, zirconia ceramics or other ceramics and high polymer materials. The size of the two sealing pieces is related to the whole size of the handheld part of the planing device, and in the existing structure, the diameter of the sealing pieces is about 20mm, so that the requirements of good water sealing and small damping can be met. The long-term use effect proves that the sealing structure design can ensure reliable water sealing and stable small damping to the motor rotating shaft when the planing device is used for a long time.

024 is a detail view of the head of the planer, which is enlarged and shown in more detail in figure 3,

in fig. 3, 030 is a top view of the cutter head portion, 031 is a side view of the cutter head portion, 032 is a cutter head outer sleeve, and the top of the cutter head outer sleeve is provided with an outer cutting edge 035 which is formed by cutting and polishing in a slant shape. 033 is an inner cutter head for an inner sleeve head. The inner sleeve is driven by a driving motor to rotate back and forth or rotate left and right in one direction in the outer sleeve. 034 refers to inner plane cutter and cutter teeth. 036 is the angle between the opening of the outer cutter and the cutter shaft.

Wherein FIG. 4 (1) is a schematic view of the cutter head. (2) Is a schematic view of the inner plane blade. (3) Is a top view of the outer planer tool. (4) The side view of the outer planer tool, 037, is the outer planer tool tooth. In the context of figure 4, it is shown,

d, distance between tooth point of inner planer tool and tooth point of outer planer tool

L2, inner planer tool with long opening

L3 inner planer tooth spacing

W2 width of inner planer teeth

h3 height of inner plane cutter

d4 inner planer head pipe diameter

d3 inner planer tool pipe diameter

L1 external planer tool opening width

Height of H inner planer head

H1 height of outer planer head

Theta angle of inclination of outer planer tool opening to planer tool shaft

H2 outer planer tool gear height

W1 width of outer planer teeth

D2 outside planer tip diameter

D1 outer blade diameter

Claims

1. A soft tissue planer for human body, which is applied to urinary surgery and is a prostate soft tissue planer for benign prostate enlargement, and is characterized in that,

(1) the planing tool bit of the head comprises an inner planing tool rotating in a back-and-forth vibration mode and an immovable outer planing tool pipe, the height of the inner planing tool bit is 120 to 150 percent of that of the outer planing tool bit,

(2) the two sides of the opening of the outer planer tool are provided with cutter teeth with specific shapes,

(3) the diameter of the inner planer head part is at least 5 percent thinner than that of the inner planer tool,

(4) the diameter of the outer planer head part is at least 5 percent smaller than that of the outer planer tool,

(5) the inner planer tool is driven by a motor, the motor drive is provided with an angle position sensor, a motor drive and sensing circuit senses the angle position information and the rotating speed information of a motor shaft and carries out intelligent drive on the motor so as to realize intelligent control on the angle position and the moving speed of the inner planer tool which are insensitive to planing load change,

(6) when the load of the motor exceeds a preset value, the motor drive automatically stops and sends out an alarm signal, when the excessive load is relieved, the motor automatically recovers to the operation of a set value,

(7) the rotatable water seal between the motor rotating shaft and the specific negative pressure suction water channel adopts two sealing pressing sheets with specific surface finish to form water seal, wherein one sheet is fixed in position, the other sheet is connected with the motor rotating shaft, and the pressure spring is tightly contacted with the fixed sealing pressing sheets at certain pressure to realize water seal but can rotate mutually;

wherein the opening line of the outer planer tool is parallel to the pipe diameter of the planer tool, the diameter of the outer planer tool is 4-6 mm, the opening length is 8-12mm, the height of the planer teeth is 0.9-1.5mm, and the width of the planer teeth is 0.6-1.0 mm;

the pipe diameter of the head part of the inner planer is 2.5mm to 5mm, the opening length is 8 mm to 15mm, the width is 1 mm to 2.5mm, the tooth height is 0.2 mm to 0.5mm, and the tooth width is 0.5mm to 1.0 mm;

the inclination angle between the opening of the outer planing tool and the planing tool shaft is 9-12 degrees.

2. The human soft tissue planer of claim 1 wherein the rotation speed range is 100 and 10000 rpm.

3. The human soft tissue planer of claim 1 wherein the outer planer edge has opposite tips at opposite sides of the opening.

4. The human soft tissue planer of claim 1 wherein the outer planer tool is also openable with the tips and valleys of the two sides facing each other.

5. The human soft tissue planer of claim 1 wherein the inner planer edge has opposite tips at opposite sides of the opening.

6. The human soft tissue planer of claim 1 wherein the inner planer tool is also openable with the tips and valleys of the teeth facing each other.

7. The human soft tissue planer of claim 1 wherein the motor is a dc brushless motor.

8. The human soft tissue planer of claim 1 wherein the water-tight rotary pressure plate material is silicon carbide, graphite, zirconia ceramic or other ceramics and high molecular polymers.

9. The human soft tissue planer of claim 1 wherein the specified negative pressure is 0 to 98 kPa.

10. The human soft tissue planer of claim 1, wherein one of the two sealing blades has a surface finish of Ra0.05-Ra0.3 and the other has a surface finish of Ra0.3-Ra1.6.