KR101502412B1 - Forceps for laparoscopic surgery and its manufacturing method - Google Patents

Abstract

The present invention relates to a forceps used in a laparoscopic surgery. Disclosed is a forceps structure which can improve a human body tissue picking function with high friction force by increasing the contact area with a human body by forming a micro-sized pattern on the surface of the forceps. Disclosed is a forceps of a laparoscopic surgery, which comprises a first and second link (150,160) hinged on the end of a moving bar; a second tong part (310) including multiple protruded parts inside, and forming a micro pattern forming protruded part (320) on the surface; a first tong part (300) formed in a structured of facing the second tong part, and forming a micro pattern forming protruded part (320) on the surface; and a link housing (200) including rotatory shafts (240,241) and receiving the first and second links (150,160) inside at the same time.

Description

[0001] Forceps for laparoscopic surgery and its manufacturing method [

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forceps for use in laparoscopic surgery, and more particularly, to a forceps structure capable of improving the function of a human tissue clamping body by increasing a contact area with a human body, Belongs.

The forceps used in laparoscopic surgery are usually manufactured through mechanical processing. Using this method, it is advantageous that the price is relatively cheap when produced in a small amount, but a complex shape can be produced instead. In the process of the operation, the internal organs of the human body are very slippery and fragile, so a technique is required to apply less force to the forceps but not slip well.

Micro-sized patterns can be used to solve these problems. Applying micro patterning to the area of contact with the organs can increase the contact area when the forceps catch the tissue and can apply a large frictional force with less force. The question is how to apply a micro-sized pattern to the contact area of the forceps.

In order to solve this problem, it is preferable to use a powder injection molding method. The powder injection molding method is a manufacturing method combining a powder metallurgy method and a plastic injection molding method. The powder metallurgy method is a method of producing a product by pressurizing a metal powder and then sintering by applying heat, and the plastic injection molding method is a method of producing a desired shape product by injecting molten plastic material into a mold by heating.

The process of the powder injection molding process is as follows. First, the metal powder to be used in the product is mixed with an organic binder, that is, a polymer-based binder. Through this process, the metal powder has rheological properties due to heat-polymerized binder.

This rheological property allows injection of the desired shape like plastic injection molding. The ratio of the powder to the binder is also an important factor to have proper rheological properties, which is determined by the torque rheometer experiment according to the ratio of the powder to the binder. In order to achieve the desired shape, the mold should be designed considering the shrinkage factor. Shrinkage is determined by the dilatometry experiment through the shrinkage rate according to the sintering conditions of the standard specimen for this experiment.

The pattern size of the metal mold can realize a shape of about 100 m for a metal material and a pattern of a smaller size for a ceramic material. Since the parts made by the injection molding and injection molding contain the organic binder, they are degreased with solvent, and then the binder is removed by hot degreasing and the final product is manufactured through the final sintering.

Publication No. 10-2005-0088571 filed on March 2, 2004, entitled " Vascular Tongs for Endoscopic Surgery "

It is an object of the present invention to provide a laparoscopic surgical instrument which can be used as a laparoscopic surgical instrument without using a simple mechanical machining method, The purpose of this study is to propose a method of making a forceps using a new method and 2) to propose a forceps that does not slip well by improving the frictional force with the human body tissue by creating a micro size pattern on the contact part of the forceps using micropatterning .

A moving bar (120) for moving forward and backward;

First and second links hinged to an end of the moving bar;

A second gripper 310 coupled to the hinge 162 of the first link through a hinge hole 364a and having a plurality of protrusions therein and having a protrusion 320 formed on the surface thereof;

The first link is formed with a hinge (152) of the second link and a hinge hole (364). The first link is formed with a structure in which the second link is engaged with the second link, (300);

The rotation shafts 240 and 241 are inserted into the rotary shaft holes 362 and 362a which are communicated with each other so that the first and second grippers 360 and 360a of the first and second grippers are in contact with each other, And a link housing (200) for receiving the laparoscopic surgical forceps.

Wherein the concavo-convex structure of the surface of the first and second grippers includes:

The fine pattern forming protrusion 320 and the recess 330 are repeatedly formed and are formed at an angle with respect to the longitudinal direction of the first and second clamping parts and are inclined (s direction). The lengths of the first and second links are the same.

The movement bar 120 is inserted into the bar body 100 and its front end is hinged to the first and second links 150 and 160 at a predetermined angle with respect to the longitudinal direction of the movement bar.

The first and second links 150 and 160 are hinged to the upper and lower ends of the moving bar 120,

The first and second links are provided with hinges 152 and 162, respectively, and circular-shaped hinge ends 153 and 163 are formed at the ends thereof.

A hinge hole 364 and a rotation axis hole 362 are formed in the hinge 360 and 360a of the first clamping unit 300 and a hinge hole 364 of the two holes 364 and 362 is formed in the outer portion of the first aggregate As shown in Fig.

The link housing is formed by coupling the first and second housing bodies 210 and 220, which are two bodies, and the rotation shafts 240 and 241 formed on the first and second housing bodies are coupled to each other.

       The forceps structure has the following configuration.

That is, the first and second clamps 300 and 310 include a fine pattern forming protrusion 320 formed with fine patterns and a concavo-convex structure formed by alternately forming a plurality of recesses 330. The surface of the fine pattern forming protrusion 320 The fine patterns 321 and 322 are formed and the fine pattern forming protrusions 320 and the recesses formed in the first and second clamping portions are formed to interlock with each other.

The first and second clamps 300 and 310 include a fine pattern forming protrusion 320 having fine patterns and a concave and convex structure having a plurality of recesses 330. The surface of the fine pattern forming protrusion 320 The fine patterns 321 and 322 are formed, and the length of the flat upper surface of the portion 321 protruding from the fine pattern is 50 to 200 micrometers.

The width of the space 322 between the protruding portions in the fine pattern is preferably 50 to 200 micrometers.

The formation direction of the fine pattern forming protrusions 320 and the recess 330 is formed to be inclined (s direction) at a predetermined angle with the longitudinal direction of the first and second clamping portions.

A method for manufacturing a laparoscopic surgical forceps,

The first and second links, the first and second clamps, and the link housing are manufactured by a powder injection molding method,

Mixing a metal powder and an organic powder binder to prepare a feedstock;

Performing injection molding using the prepared feedstock;

A debinding step of removing the binder contained in the injection molded body formed in the injection molding step;

A sintering step performed to densify the tissue after the degreasing step; And

The degreasing and revolving step includes a solvent degreasing step for dissolving the low molecular weight binder and a method for removing the polymer binder.

The metal powder is preferably stainless steel, but other materials may be used.

The features and advantages of the present invention are summarized as follows:

Since the forceps are manufactured using the powder injection molding method, the present invention has excellent mechanical properties as compared with conventional surgical tools manufactured through machining. In addition, since the powder injection molding method is used, there is an advantage that the forceps can be manufactured with simpler and quicker production cost at a low cost. Through the micro patterning, the contact area of the protrusions formed with the fine patterns of the first and second clamps By widening it, large friction force is generated even with a small force, and it is possible to solve the problem of slipping or damaging the tissue while performing the operation with the conventional forceps.

1 is a perspective view of a preferred embodiment of the present invention,
2 is an exploded perspective view of the first and second grippers 300 and 310,
3 is a side enlarged view of the fine pattern forming protrusion,
4 is an exploded perspective view for explaining the connection relationship between the link housing 200 and the first and second links 150 and 160 and the movement bar 120,
5 is a view for explaining the operation of the first and second grippers,
6 is an exploded perspective view of the link housing,
7 is a side view of a laparoscopic surgical forceps,
8 to 15 are views for explaining the manufacturing method of the present invention.
16 is a plan view of the first and second grippers according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. However, the scope of the present invention is not limited to the following embodiments, but should be understood from the claims.

2 is a perspective exploded view of the first and second clamps 300 and 310, FIG. 3 is a side enlarged view of a protrusion of a fine pattern, FIG. 4 is a side view of the link housing 200, FIG. 5 is an explanatory view of the operation of the first and second clamps, FIG. 6 is an exploded perspective view of the link housing, and FIG. 7 is an exploded perspective view of the link housing. Figure 1 is a schematic view of a side view of a laparoscopic surgical forceps. 8A and 8B are views for explaining the manufacturing method of the present invention.

Summary of the Invention

A moving bar (120) for moving forward and backward;

First and second links hinged to an end of the moving bar;

A second gripper 310 coupled to the hinge 162 of the first link through a hinge hole 364a and having a plurality of protrusions therein and having a protrusion 320 formed on the surface thereof;

The first link is formed with a hinge (152) of the second link and a hinge hole (364). The first link is formed with a structure in which the second link is engaged with the second link, (300);

The rotation shafts 240 and 241 are inserted into the rotary shaft holes 362 and 362a which are communicated with each other so that the first and second grippers 360 and 360a of the first and second grippers are in contact with each other, And a link housing (200) for receiving the laparoscopic surgical forceps.

Wherein the concavo-convex structure of the surface of the first and second grippers includes:

The fine pattern forming protrusion 320 and the recess 330 are repeatedly formed and are formed at an angle with respect to the longitudinal direction of the first and second clamping parts and are inclined (s direction). The lengths of the first and second links are the same.

The movement bar 120 is inserted into the bar body 100 and its front end is hinged to the first and second links 150 and 160 at a predetermined angle with respect to the longitudinal direction of the movement bar.

The first and second links 150 and 160 are hinged to the upper and lower ends of the moving bar 120,

The first and second links are provided with hinges 152 and 162, respectively, and circular-shaped hinge ends 153 and 163 are formed at the ends thereof.

A hinge hole 364 and a rotation axis hole 362 are formed in the hinge 360 and 360a of the first clamping unit 300 and a hinge hole 364 of the two holes 364 and 362 is formed in the outer portion of the first aggregate As shown in Fig.

The link housing is formed by coupling the first and second housing bodies 210 and 220, which are two bodies, and the rotation shafts 240 and 241 formed on the first and second housing bodies are coupled to each other.

The forceps structure has the following configuration.

That is, the first and second clamps 300 and 310 include a fine pattern forming protrusion 320 formed with fine patterns and a concavo-convex structure formed by alternately forming a plurality of recesses 330. The surface of the fine pattern forming protrusion 320 The fine patterns 321 and 322 are formed and the fine pattern forming protrusions 320 and the recesses formed in the first and second clamping portions are formed to interlock with each other.

The first and second clamps 300 and 310 include a fine pattern forming protrusion 320 having fine patterns and a concave and convex structure having a plurality of recesses 330. The surface of the fine pattern forming protrusion 320 The fine patterns 321 and 322 are formed, and the length of the flat upper surface of the portion 321 protruding from the fine pattern is 50 to 200 micrometers.

The width of the space 322 between the protruding portions in the fine pattern is preferably 50 to 200 micrometers.

The formation direction of the fine pattern forming protrusions 320 and the recess 330 is formed to be inclined (s direction) at a predetermined angle with the longitudinal direction of the first and second clamping portions.

A method for manufacturing a laparoscopic surgical forceps,

The first and second links, the first and second clamps, and the link housing are manufactured by a powder injection molding method,

Mixing a metal powder and an organic powder binder to prepare a feedstock;

Performing injection molding using the prepared feedstock;

A debinding step of removing the binder contained in the injection molded body formed in the injection molding step;

A sintering step performed to densify the tissue after the degreasing step; And

The degreasing and revolving step includes a solvent degreasing step for dissolving the low molecular weight binder and a method for removing the polymer binder.

The metal powder is preferably stainless steel, but other materials may be used.

Forceps Example

Referring to FIG. 7, the present invention is a tool for grasping a human body tissue during an operation to open or close the grip portions 300 and 310 of the end portion of the rod body 100 by grasping or releasing the grip 10.

A feature of the present invention is that the fine pattern structure in the first and second clamps and the method of manufacturing the parts in contact with the human body in the structure can be rapidly manufactured at a low cost with excellent mechanical properties by powder injection molding.

Referring to Figures 1 to 4, there is shown a structure for gripping or releasing the anterior region of the forceps, i.e., the body tissue.

The first and second grippers 300 and 310 are actuated to be opened or closed by the forward and backward movement of the movable bar 120. (FIG. 1) In FIG. 2, the first and second grippers are shown separated from each other. Hinges 360 and 360a are formed at the ends of the first and second grippers. In the state where the hinges of the first and second grippers are in contact with each other The engagement state as shown in Fig. 14 is maintained.

The recesses 330 and the convex protrusions are repeatedly formed on the portions of the first and second clamps facing each other, and the upper surface of the protrusions is the protrusion 320 of the fine pattern formation.

FIG. 3 shows the surface of the fine pattern formation protrusion 320 itself, and fine irregularities as shown in FIG. 3 are also formed on the fine pattern protrusion surface. These fine irregularities are called "fine patterns".

The fine pattern is defined as a portion including the reference numeral 321 and the reference numeral 322.

The length of the flat upper surface of the protruded portion 321 in the fine patterns 321 and 322 is 50 to 200 micrometers and the width of the space 322 between the protruded portions in the fine pattern is formed to be 50 to 200 micrometers But is not limited thereto. FIG. 3 shows an example in which 200 and 50 macrometers are represented, respectively.

In a typical laparoscopic surgery, the surface of the forceps has a smooth structure. Under such a structure, the human tissue often slides even after being housed frequently, which is often difficult to accurately grasp.

In the present invention, it is an object of the present invention to increase the contact area of the surface by forming a fine pattern on the uneven portion of the forceps and maximize the frictional force when picking up the human tissue, thereby quickly and accurately collecting the human tissue.

Such a fine pattern is not possible with a conventional metal working method, and a method of manufacturing by applying the powder injection molding method disclosed in the present invention is used.

The movable bar 120 connected to the first and second clamps is inserted into the bar body 100 and the front end of the movable bar 120 has a predetermined angle with the longitudinal direction of the movable bar, And is hinged. The rear end of the moving bar is coupled with the handle 10 (FIG. 7) (not shown), and the structure in which the handle portion and the rear portion of the moving bar are coupled is not known.

In FIG. 4, the link housing 200 of FIG. 1 and the first and second links 150 and 160 drawn into the link housing 200 and the moving bar 120 are disassembled and isolated from the link housing.

The first and second links 150 and 160 are hinged to the upper and lower ends of the moving bar 120. The first and second links are formed with hinges 152 and 162. Hinge ends 153 and 163, Respectively.

The hinge 152 of the second link 150 (FIG. 4) is inserted into the hinge hole 364 (FIG. 2) of the first gripper and becomes rotatable.

The hinge 162 of the first link 160 (FIG. 4) is inserted into the hinge hole 364a (FIG.

As can be seen in FIG. 5, the first and second links may be wedged in a V-shape, and the first and second grips may be connected to their respective ends to widen and collapse.

At this time, the opening and closing operations of the first and second tongues 300 and 310 operate around the rotation shaft holes 362 and 362a.

As shown in FIG. 2, a hinge hole 364 and a rotating shaft hole 362 are formed in the hinge 360 and 360a of the first collecting part, respectively, and a hinge hole is located at the shortest end. The same applies to the second aggregation unit.

Rotation shafts 240 and 241 formed in the link housing 200 shown in FIG. 4 are inserted into the rotation shaft holes 362 and 362a.

The link housing can be manufactured by combining the first and second housing bodies 210 and 220, which are two bodies, as shown in FIG. The rotation shaft may be formed by coupling the rotation shafts of the first and second housing bodies to each other.

The first and second links 150 and 160 are inserted into the link housing 200, and FIG. 4 shows a state in which the first and second links are drawn out.

The hinges 360 and 360a (FIG. 5) corresponding to the ends of the first and second clamping parts hinged to the first and second links, which are drawn into the link housing, The same operation can be performed.

Referring to FIG. 5, the operation principle of the first and second grippers can be grasped.

That is, it can be seen that the movement bar 120 moves forward by P in the leftmost figure, and it can be grasped that the movement bar is gradually retreating from the right side of the figure.

When the movable bar is moved back by P, the first and second clamps 300 and 310 are mutually moved in a downward direction. At this time, the first and second links and the first and second clamps are extended in a straight line. On the other hand, when the movable bar advances, the first and second links and the first and second clamps are opened at an angle to the longitudinal direction of the movable bar at an angle.

In this case, the rotating center axis of the clamps 300 and 310 becomes the rotating shafts 240 and 241 formed in the link housing 200.

Hereinafter, the structure of the first and second grippers 300 and 310 will be described in more detail.

Referring to FIG. 2, each of the first and second clamping portions of the present invention is formed into a concave-convex portion of the first and second clamping portions. As shown in FIG. 1, A fine pattern of 200 micrometers is formed. When the human tissue is gripped, the frictional force due to a very large concavo-convex surface area is effectively increased to hold the human body tissue, and it is advantageous not to slip easily.

FIG. 16 shows a plan view of the first and second clamps of the present invention, wherein the protrusions and recesses are alternately formed on the first and second clamps.

The concavo-convex structure forming direction is formed so as to form an overall oblique direction (S direction) with respect to the longitudinal direction of the forceps (Fig. 7) or the longitudinal direction (T direction) of the first and second clamps.

This is to minimize the probability of the human tissue being slipped away from the first and second grippers after the human tissue is collected during the operation. When the surgeon slides the human tissue in a direction perpendicular to the s direction It is preferable to form the concave portion 330 and the fine pattern forming protrusion 320 so as to be inclined in the s direction. Needless to say, the present invention is not limited to forming the concavo-convex shape only in the direction of Fig.

Forceps  Manufacturing method

A method for manufacturing the forceps of the present invention will be described with reference to the drawings in Fig.

Fig. 8 is a schematic view of the powder phase casting process, Fig. 9 is a graph showing the characteristics (size distribution and shape) of the powder, Fig. 10 is a table showing the characteristic values of the powder, As a result, (a) shows that the mixing torque (b) as a function of mixing time in various solid loading is the mixing torque (a) 12 shows the results of shrinkage rate through dilatometry experiment, FIG. 13 shows photographs of the product, FIG. 14 shows TGA test results, and FIG. 15 shows the results of the final product ( Link housing).

FIG. 8 shows a manufacturing flow chart by a powder injection molding process. Powder injection molding is divided into four stages. In the first step, a feedstock is prepared by mixing a powder and a binder. Using the feedstock thus manufactured, injection molding is performed in the second step, and a desired shape can be formed.

Since the injection body thus formed contains both the powder and the binder, the binder which has provided the rheological properties for injection is removed through the debinding process.

The degreasing is divided into solvent degreasing and hot degreasing. The solvent is degreased to dissolve the low molecular binder, and the polymer binder is provided through the hot degreasing. After degreasing, voids are formed at the place where the binder exits, and the final shape is obtained by densification through the final step of sintering.

One) Powder and Binder

In the present invention, the powder used was a bio-compatible powder as a 17-4PH stainless steel powder. The particle size distribution and shape of the powder are shown in Fig. The properties of the powder are summarized in FIG.

The prepared powder and binder were mixed to prepare a feedstock. The ratio of powder to binder for mixing was determined by torque rheometer experiment. The experiment was carried out through Haake PolyLab QC, MCIK and the experimental conditions were 150 rpm, 150 ° C.

The results of the experiment are shown in FIG. 1% of powder was placed at intervals of about 5 minutes, and the amount of powder that could reach the maximum in the binder was found through the torque applied to the screw.

It is not clear at a point where the torque, which is the conventional theory, suddenly increases or the torque value suddenly fluctuates. To make the present invention, the tangent in the low solid loading (low solid loading) The value at the onset point at which the tangent graph meets at the graph and high solid loading was determined as the critical solid loading of the given amount of binder.

In order to have more smooth rheological properties, the mixing ratio of powder and binder was determined by solid loading of 59%, which is about 2% lower.

2) Mold design and injection molding

A mold is required for powder injection molding using the prepared powder. The mold design was designed in consideration of the shrinkage rate during sintering.

The shrinkage rate during sintering was controlled by dilatometry. As can be seen from the results of the experiment in FIG. 12, the mold was designed considering the shrinkage percentage at a final shrinkage ratio of 17% after sintering. The injection body is shown in Fig.

3) Degreasing Debinding )

The degreasing was a process of removing the organic powder, which was heated in a solvent at 60 ° C. for 10 hours, and then the binder was removed by hot degreasing. The conditions of degreasing were determined by thermal gravity analysis (TGA). Figure 14 is the result of a TGA experiment. Polyethylene (PE) was decomposed at the highest temperature. Based on this, it was confirmed that the temperature condition should be at least 470 degrees Celsius, and the degreasing was carried out by raising the temperature to 700 degrees Celsius.

4) Sintering ( Sintering )

The sintering is carried out at a temperature of 1350 degrees Celsius, and the final product is produced by sintering. Fig. 15 shows a photograph of the final product (link housing).

The features and advantages of the present invention are summarized as follows:

Since the forceps are manufactured using the powder injection molding method, the present invention has excellent mechanical properties as compared with conventional surgical tools manufactured through machining. In addition, since the powder injection molding method is used, there is an advantage that the forceps can be manufactured with simpler and quicker production cost at a low cost. Through the micro patterning, the contact area of the protrusions formed with the fine patterns of the first and second clamps By widening it, large friction force is generated even with a small force, and it is possible to solve the problem of slipping or damaging the tissue while performing the operation with the conventional forceps.

100: rod body
120: Move bar
150: second link 152: hinge 153: hinge end
160: first link 162: hinge 163: hinge end
200: link housing 210: first housing body
220: second housing body
240, 241:
300: 1st clamp
310: 2nd clamp
320: fine pattern forming protrusion
330:
360, 360a: forceps hinge 362, 362a:
364,364a: Hinge hole

Claims (13)

delete delete delete delete delete delete delete delete delete delete delete A moving bar (120) for moving forward and backward;
First and second links hinged to an end of the moving bar;
A second gripper 310 coupled to the hinge 162 of the first link through a hinge hole 364a and having a plurality of protrusions therein and having a protrusion 320 formed on the surface thereof;
The first link is formed with a hinge (152) of the second link and a hinge hole (364). The first link is formed with a structure in which the second link is engaged with the second link, (300);
The rotation shafts 240 and 241 are inserted into the rotary shaft holes 362 and 362a which are communicated with each other so that the first and second grippers 360 and 360a of the first and second grippers are in contact with each other, And a link housing (200) for receiving the laparoscopic surgical forceps, the method comprising:

The first and second links, the first and second clamps, and the link housing are manufactured by a powder injection molding method,
Mixing a metal powder and an organic powder binder to prepare a feedstock;
Performing injection molding using the prepared feedstock;
A debinding step of removing the binder contained in the injection molded body formed in the injection molding step;
A sintering step performed to densify the tissue after the degreasing step; And
In the degreasing step, a solvent degreasing process for dissolving the low molecular binder and a polymer binder are removed
A method for manufacturing a laparoscopic surgical forceps. The method of claim 12,
Wherein the metal powder is stainless steel. ≪ RTI ID = 0.0 > 11. < / RTI >

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