JPH10155802A - Forceps - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a forceps which can prevent the deformation or destruction of a treatment part without applying any excess force operated upon a manipulate part to the treatment part even when treating any tissue in spite of hardness or size of the tissue. SOLUTION: In the forceps having an insert part 1 to be inserted into a living body, a treatment part for treating the tissue on the top end side of the insert part 1, a manipulate part 3 provided on the hand side of the insert part 1 and composed of a fixed side manipulate part 4 and a movable side manipulate part 5 and a manipulating rod 10 for transmitting the operating force of the movable side manipulate part 5 to the treatment part, the movable side manipulate part 5 is equipped with a leaf spring 6 for operating the manipulating rod 10 in a certain direction so as to close the treatment part, and opening/closing direction stopper screws 12 and 13 are provided for stopping the moving of the movable side manipulate part 5 at the time point when the elastic power quantity of the leaf spring 6 is less than a partial destructive power quantity from the manipulating rod to the treatment part in the state of closing the treatment part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forceps having a treatment section for treating a living tissue at a distal end side of an insertion section to be inserted into a living body.

[0002]

2. Description of the Related Art An openable and closable treatment section is provided at the distal end side of an insertion section to be inserted into a living body, and a living tissue is opened and closed by operating an operation section near the insertion section to open and close the treatment section. When an excessive operating force is applied to the forceps to be treated by the operation unit, the treatment unit may be broken or deformed. Therefore, in order to prevent such a problem, for example, Japanese Patent Laid-Open No. 6-7366 is disclosed.
In the publication, an adjustable stopper for regulating the end position of the operation rod in the closing direction of the forceps is arranged. This stopper prevents the treatment section from being unnecessarily applied with force.

Further, in US Pat. No. 5,273,519, a leaf spring is disposed on the operation section, and this leaf spring prevents the treatment section from being subjected to excessive force.

[0004]

However, when a soft or thin tissue of a living body is to be treated, the treatment portion is substantially closed, and the stopper portion disclosed in Japanese Patent Application Laid-Open No. 6-7366 is useful. For example, when treating relatively hard and thick tissue such as cartilage, that is, in a state where the treatment portion is opened to some extent, the stopper portion may not always work. In this case, an excessive force is applied to the treatment section by the operation of the operation section, and the treatment section may be deformed or broken.

In US Pat. No. 5,273,519,
The excessive force applied to the operation unit is not always absorbed by the leaf spring, and a part of the excessive force is applied to the treatment unit. Therefore, the deformation and destruction of the treatment unit cannot be completely prevented.

[0006] The present invention has been made in view of the above circumstances, and the object thereof is to determine what kind of tissue, that is, what opening angle the treatment section has, regardless of the hardness and size of the tissue. Even in the state described above, an object of the present invention is to provide a forceps in which an excessive force applied to the operation section is not applied to the treatment section, and deformation and destruction of the treatment section can be completely prevented.

[0007]

In order to achieve the above object, the present invention provides an insertion part to be inserted into a living body, a treatment part for treating a tissue at the distal end side of the insertion part, In a forceps including an operation unit provided on a hand side and including a fixed side operation unit and a movable side operation unit, and a transmission unit for transmitting an operation force of the movable side operation unit to the treatment unit, An elastic means provided to actuate the transmission means in a direction in which the treatment section is closed; and an elasticity of the elastic means based on at least a part of a destructive force between the transmission means and the treatment section when the treatment section is closed. Stop means for stopping the movement of the movable side operation unit at a time when the power is small is provided.

That is, it is attached to the movable operation section,
It is possible to advance or retreat the operating rod as the transmission means by pushing or pulling, and the elastic member as elastic means connected so that the treatment section at the distal end can move in the closing direction, and the treatment section at the distal end closes And a stopper screw as stopper means disposed on the fixed-side operation portion for restricting the movement of the movable-side operation portion at the position.

(Strain at the elastic limit of elastic member ε ₂ ≧
In the case of the strain ε ₁ ) of the elastic member due to the movement of the movable side operation unit from fully open to fully closed, when excessive force is applied to the operation unit, the movable side operation unit moves due to the deformation of the elastic member and moves to the stopper screw. At this point, excess force is no longer transmitted to the distal treatment section.

[0010] At this time, the amount of destructive force of the treatment section is larger than the amount of force that generates a strain on the elastic member due to the movement of the movable operation section. (F _A > F ₁ ) (Strain ε ₂ at elastic limit of elastic member <Strain ε of elastic member due to movement of movable side operation unit from fully open to fully closed
_In the case of ₁ ), the amount of destructive force of the treatment section is set to be larger than the amount of force that generates a strain on the elastic member due to the movement of the movable operation section. (F _A > F ₁ ) In this case, when an excessive force is applied to the operation unit, the elastic member elastically or plastically deforms, and the movable operation unit hits the stopper screw or the elastic member is broken. At this point, the excess force is no longer transmitted to the distal treatment section.

Further, the destructive force of the treatment section is equal to or less than a force for generating a strain in the elastic member due to the movement of the movable side operation part, and (F _A <F ₁ ). And a safe breaking member disposed on the operation unit set with a breaking force larger than a force generating a strain at the elastic limit. (F ₂ <F _S <F ₁ ) In this case, if an excessive force is applied to the operation unit, the elastic member is elastically or plastically deformed, and the movable operation unit hits the stopper screw or the elastic member is broken. And the safety destruction member is destroyed.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 show a first embodiment, and FIG. 1 is an overall view of a forceps. As shown in FIG. 1, the forceps are provided at an insertion portion 1 to be inserted into a living body, a treatment portion 2 provided at a distal end side of the insertion portion 1, and a base end portion (hand side) of the insertion portion 1. And an operation unit 3.

The operation section 3 is composed of a fixed operation section 4 and a movable operation section 5 which are strong enough not to be deformed or broken as long as they are grasped by a human hand. As shown in FIG. 2, a leaf spring 6 is fixed by screws 7 on a side of the movable side operation unit 5 facing the fixed side operation unit 4. Further, as shown in FIGS. 3A and 3B, an operating rod connecting pin 8 is provided so as to be sandwiched between the movable side operating portion 5 and the leaf spring 6. The operating rod connecting pin 8 is an operating rod connecting member 9. It is connected to the. An operation rod 10 as a transmission means is connected to the operation rod connecting member 9.
Reference numeral 0 extends to the distal end side of the insertion section 1 and is connected to the treatment section 2.

The movable operation section 5 has a structure capable of rotating around a fulcrum pin 11 provided on the fixed operation section 4. Assuming that the fulcrum pin 11 is a straight line that is perpendicular to the operating rod 10 and passes through the center (O) of the fulcrum pin 11 and that the end positions of the pivotal movement of the operating rod connecting pin 8 are points P and Q, respectively. As shown in FIGS. 3 and 4, the angle POR = the angle QOR = the angle <α.

The fixed operation unit 4 includes a movable operation unit 5.
The opening or closing direction stopper screws 12 and 13 as stopper means are screwed and fixed toward the leaf spring 6 to set the opening angle of the treatment section 2. Further, both stoppers 12, 13 are arranged at positions where they can be adjusted at the end when the assembly is completed.

The leaf spring 6 is elastically deformed in an initial state by an adjusting screw 14 which is screwed and fixed to the movable side operation portion 5 to provide an equipment force. Further, as shown in FIG. 5, the strain ε ₁ of the leaf spring 6 due to the movement of the movable side operation unit 5 from fully open to fully closed is set to be equal to or less than the strain ε ₂ at the elastic limit of the leaf spring 6. (Ε ₁ ≦
ε ₂ ), and the breaking force F _A of the treatment section 2 (the amount of force applied to the operation section 3) is set to be larger than the force F ₁ of the operation section 3 that generates ε ₁ . (F _A > F ₁ ) Next, the operation of the forceps configured as described above will be described.

The operation rod connecting pin 8 rotates according to a part of an arc centered on the fulcrum pin 11. This turning movement is transmitted to the operation rod 10 as a forward and backward movement, and finally the treatment section 2 is operated.

By setting the angle POR = the angle QOR = the angle α, it is possible to set the minimum L with respect to the advance / retreat distance (hereinafter, stroke) of an arbitrary operation rod 10. Thereby, the vertical movement of the operation rod 10 is minimized. The opening or closing direction stopper screws 12, 13 can be adjusted steplessly by screw adjustment. Adjustment is possible at the end after assembly.

During normal use of the forceps, the operating rod 10 is advanced and retracted with a force smaller than the mounting force of the leaf spring 6, so that when the operating section 3 is operated, the leaf spring 6 does not feel springy and operability is good.

When an excessive force is applied to the operation unit 3, ε ₁ <ε ₂ irrespective of the opening angle, the movable side operation unit 5 is moved by the deformation of the leaf spring 6. Then, it abuts on the stopper screw 13 in the closing direction. At this point, the excessive force is not transmitted to the treatment section 2 at the distal end, so that deformation and destruction of the treatment section 2 can be prevented.

Since the leaf spring 6 is constantly deformed within the elastic range, it is non-destructive and can be used many times. Therefore, in the present embodiment, the operability is improved by minimizing the vertical movement of the operation rod 10.

The stroke can be adjusted steplessly after assembly. In addition, adjustment after assembly is possible, including individual variations. Due to the abnormal use, even if the operation part 3 of the forceps is gripped with excessive force, the non-destructive safety device works, so that the durability is improved.

FIG. 6 shows a second embodiment, in which ε ₁ > ε _2.
In addition, F _A > F ₁ > F ₂ is set. Others are the same as the first embodiment. According to the present embodiment, when an excessive force is applied to the operation unit 3, the situation differs depending on the opening angle of the treatment unit 2. When the opening angle is small so that the leaf spring 6 can be deformed within the elastic range, the movable side operation unit 5 moves due to the deformation of the leaf spring 6 and abuts against the closing stopper screw 13.

If the leaf spring 6 is widened so that it is deformed beyond the elastic range, the leaf spring 6 is plastically deformed or broken. Since the leaf spring 6 is located in the operation section 3, there is no fear that parts may fall into the body due to destruction.

At this time, since F _A > F ₁ , the treatment section 2 is not destroyed. Deformed or broken leaf spring 6
Can be easily replaced by removing the screw 7.

According to the present embodiment, the.
Has the same effect as. When the same leaf spring 6 as in the first embodiment is used, the stroke can be lengthened. That is, the opening angle of the treatment section 2 at the distal end can be widened.

FIGS. 7 and 8 show a third embodiment.
ε ₁ > ε ₂ (F ₁ > F ₂ ), F ₂ <F _S <F _A <F _1, and the heads of the opening and closing direction stopper screws 15 and 16 are spherical or elastic members 19 are attached. . Further, the operating rod connecting member 9 and the second operating rod connecting member 17 are connected by a safety breaking pin 18, and the second operating rod connecting member 17 and the operating rod 10 are fixed by screws.
The safety breaking pin 18 is designed to fracture at a force of F _S.

Therefore, when an excessive force is applied to the operation section 3, the situation differs depending on the opening angle of the treatment section 2. When the opening angle is small so that the leaf spring 6 can be deformed within the elastic range, the movable side operation unit 5 moves due to the deformation of the leaf spring 6 and hits the closing direction stopper screw 15. The leaf spring 6
If the opening angle is large enough to cause deformation in a range beyond the elastic range, the leaf spring 6 is plastically deformed or the safety breaking pin 18 is broken. At this time, since the leaf spring 6 or the safety breaking pin 18 is in the operation section 3, there is no fear that the parts may fall into the body due to breaking.

Further, both opening and closing direction stopper screws 15, 1
6 has a spherical head or an elastic member 19 attached thereto. Therefore, even when the movable side operation unit 5 or the leaf spring 6 abuts against both the opening / closing direction stopper screws 15, 16 respectively, the opening / closing direction stopper screws 15, 16 are provided. Does not wear.

According to the present embodiment, when the diameter of the treatment section 2 is reduced, the strength is reduced. Even in that case, it can be a safety device when an excessive force is applied to the operation unit 3. Further, the treatment section 2 is not deformed or broken.

According to each of the above embodiments, the following configuration is obtained. (Supplementary Note 1) An insertion section to be inserted into a living body, a treatment section for treating tissue at the distal end side of the insertion section, and a fixed-side operation section and a movable-side operation section provided near the insertion section. In a forceps having an operation unit and a transmission unit for transmitting an operation force of the movable operation unit to the treatment unit, an elastic unit provided on the movable operation unit and operating the transmission unit in a direction in which the treatment unit closes. A stop for stopping the movement of the movable side operation unit when the elastic force of the elastic unit is smaller than at least a part of the destructive force between the transmission unit and the treatment unit in a state where the treatment unit is closed. And forceps.

(Supplementary note 2) The forceps according to Supplementary note 1, wherein a strain amount of the elastic means up to an elastic limit is equal to or more than a movable amount of the movable operation unit. (Supplementary note 3) The forceps according to supplementary note 1, wherein the elastic means is a leaf spring. (Supplementary Note 4) The strain amount of the elastic means up to the elastic limit is set smaller than the movable amount of the movable side operation unit, and
The amount of destructive force of the treatment unit depends on the maximum movement amount of the movable operation unit.
The forceps according to claim 1, wherein the forceps are set to be greater than the elastic force of the elastic means.

(Supplementary Note 5) The amount of strain of the elastic means up to the elastic limit is set smaller than the movable amount of the movable operation unit, smaller than the breaking force of the treatment unit, and the elasticity of the elastic means at the elastic limit. The forceps according to claim 1, wherein a breaking force is set to be greater than the force, and a safety breaking member is provided on the operation unit. (Supplementary note 6) The forceps according to supplementary note 1, wherein the stop means is a stopper screw provided on a fixed-side operation unit.

On the other hand, as forceps for treating tissue of a living body,
USP 5,389,104 and USP 5,5
A punch forceps disclosed in Japanese Patent Application No. 07,772 is known. This punch forceps is a forceps for cutting tissue such as thin bone by fitting a movable jaw to a fixed jaw having a groove. In US Pat. No. 5,389,104, the drive shaft is pulled proximally to close the movable jaw, but the movable jaw receives a force in the proximal direction. Therefore, if there is a minute gap between the fulcrum pin and the fulcrum hole of the movable jaw, the movable jaw moves in the proximal direction by a minute distance corresponding to the gap during excision, and particularly the movable jaw which affects the excision ability. A gap is formed between the top of the jaw, which is formed by a polygon or a part of the circumference, and the top of the groove of the fixed jaw, and the cutting ability is reduced. (Even if the movable jaw moves, the gap on the side surface does not change. Therefore, it is most important to maintain the clearance at the top without losing the cutting ability.) When adjusted to eliminate the gap at the top when moving in the proximal direction by a corresponding distance, this time, when the movable jaw opens, it moves in the distal direction, and the tops come into contact with each other, making it difficult to open. A problem arose.

As means for preventing this, it is necessary to adjust the outer diameter of the fulcrum pin to match the fulcrum hole of the movable jaw to eliminate a gap or to improve the processing accuracy of the fulcrum pin. However, there have been problems in that it takes a long time to adjust and the processing cost increases. However, USP 5,50
In the method of closing the movable jaw by pushing the drive shaft in the distal direction (that is, the direction in which the top of the fixed jaw is facing) as described in the specification of Japanese Patent No. 7,772, the movable jaw is reversed even if there is a gap in the fulcrum pin. , The gap between the tops of the movable jaw and the fixed jaw is eliminated, and the cutting ability can be increased.

Next, FIG. 16 and US Pat.
P4,729,374, USP 5,112,3
There is a so-called rear-opening punch forceps in which the movable jaw a opens in the proximal direction to cut tissue in the proximal direction, as in US Patent No. 46 and US Pat. No. 5,443,475. In this case, similarly to the punch forceps, when the movable shaft a is closed by pulling the drive shaft in the proximal direction (that is, the direction in which the top of the fixed jaw b is facing), the cutting ability is obtained regardless of the state of the fulcrum pin c. Increase. Conversely, in the method shown in FIG. 16, the fulcrum pin c
It was necessary to adjust the thickness of the object. For example, FIG.
In (b), the fulcrum pin c is formed in a tapered shape in order to minimize the gap between the fulcrum pin c.

[0037] Therefore, it is possible to prevent a reduction in the resection capability of the punch forceps and the back-opening punch forceps and to perform simple and inexpensive processing.
In consideration of the compatibility of the assembly, the movable jaw is closed by displacing the drive shaft in the direction facing the top of the movable jaw (punch forceps push the drive shaft in the distal direction, and rearward open forceps move the drive shaft in the proximal direction). Must be selected, the movement direction of the drive shaft is different, the operation method is different, and the operation unit is not common.

The present disclosure focuses on the above problem, and makes the moving direction of the punch forceps and the drive shaft the same (while the drive shaft is far away) while preventing both the reduction of the resection ability and the simple, inexpensive processing and assembly. (A movable jaw is closed by moving the movable jaw in the displacing direction) to provide a rearward-opening punch forceps in which an operation unit common to the punch forceps can be used.

That is, the present disclosure has a supporting portion that supports the movable jaw provided at the distal end of the elongated insertion portion, and a top portion that is connected to the drive shaft and that is formed of a polygon or a part of the circumference. A receiving jaw that has an opening groove and cuts tissue by fitting the movable jaw and the opening groove; and a supporting jaw that is pivotally supported by the support portion and rotatably connected to the receiving jaw in at least one place. A movable jaw having a top having the same shape as the top of the groove, and when the drive shaft is displaced in a direction opposite to the direction in which the top of the movable jaw faces, the receiving jaw moves in the same direction, The movable jaws are now closed.

The drive shaft is displaced, for example, in the distal direction (the direction opposite to the direction in which the top of the movable jaw faces), and the receiving jaw is moved in the distal direction (in the direction opposite to the direction in which the top of the movable jaw faces). The movable jaw is displaced in the same direction and the movable jaw is closed, so that even if there is a gap between the fulcrum pins, the receiving jaw and the top of the movable jaw are close to each other, the cutting ability can be maintained, and the operating part can be shared with the punch forceps. It is.

Next, the specific configuration of the punch forceps will be described. The punch forceps is configured as shown in the first disclosed example shown in FIGS. FIG. 9 is an overall view of the punch forceps, FIG. 10A is a longitudinal side view of the tip, FIG. 9B is a cross-sectional view taken along line BB, and FIG.
C is a sectional view, and (d) shows a DD sectional view. FIG. 11 is a perspective view of the tip, and FIG. 12 is an exploded perspective view of the tip. FIGS. 13A and 13B are side views showing the distal end portion of the punch forceps according to the second disclosure example, wherein FIG. 13A shows a state where the movable jaw is closed, and FIG. 13B shows a state where the movable jaw is opened. 14A and 14B show a distal end portion of the cup forceps of the third disclosure example, where FIG. 14A is a side view of the distal end portion, FIG. 14B is a partial cross-sectional view taken along line E-E, and FIG. 14C is a cross-sectional view taken along line FF. FIG. 15 is a side view of the operation unit according to the fourth disclosure example.

As shown in FIG. 9, the rear open punch forceps 2
Reference numeral 1 denotes a distal end portion, an insertion portion, and a handle portion. As shown in FIGS.
Is a support portion 25 connected to the insertion portion 23, the movable jaw 2
6, the receiving jaw 27.

The movable jaw 26 is rotatably supported by an arm 28 of the support 25 with a fulcrum pin 29, and the movable jaw 26 is rotatably connected to the receiving jaw 27 and a fulcrum pin 30. The arm portion 28 of the support portion 25 is provided with a slide groove 31 which is wider than the outer diameter of the fulcrum pin 30 and through which the fulcrum pin 30 can slide.
1 and is connected to the movable jaw 26. The receiving jaw 27 is provided with an opening groove 32 that can be fitted with the movable jaw 26.

The drive shaft 33 which advances and retreats inside the insertion portion 23 by the operation of the handle portion 24 and the receiving jaw 27 are connected. The connecting portion 34 of the receiving jaw 27 and the vertical groove 3 of the supporting portion 25 are so arranged that the receiving jaw 27 moves forward and backward smoothly.
5 are fitted. The supporting portion 25 is provided with an opening groove 36 connected to the longitudinal groove 35 so that the excised tissue can pass downward.

The fulcrum pin 30 has a screw 37 at one end thereof.
Are formed. However, in the present disclosure example, the fulcrum pin 30
Is fixed to the receiving jaw 27, and the movable jaw 26 rotates around it. The fulcrum pin 30 may be fixed to the movable jaw 26, and the receiving jaw 27 may rotate. The top 38 of the opening groove 36 is adjusted to match the shape of the top 39 of the movable jaw 26, and is formed of a polygon or a part of the circumference.

The lower surface including the top 39 of the movable jaw 26 and the fulcrum pin 30 are on the same straight line.
Is bent in the middle. Although not shown in the present embodiment, it may be arranged on the same straight line as the pivot pin 30 on the upper surface of the opening groove 32 of the receiving jaw 27.

Next, the punch forceps shown in FIG. 13 will be described. A movable jaw 42 supported by a support portion 41 fixed to the distal end of the insertion portion 40 and a movable jaw 42 connected to the distal end of a drive shaft 43 are provided. It comprises a receiving jaw 44 rotatably connected. The receiving jaw 44 is provided with a stopper pin 45 for preventing the movable jaw 42 from being too tight.

Next, the cup forceps shown in FIG. 14 will be described. The cup forceps is a forceps having a tip portion 46 formed in a cup shape so as to easily cut and collect a large tissue.
The tip has a curved shape as shown in FIG. In the present disclosure, one end 46 is open, but two upper and lower ends 46 may be open.

Next, the operation portion shown in FIG. 15 will be described. A base 48 which can be engaged with a syringe is formed at the rear end of the handle portion 47, and the drive shaft 49 can be inserted into the opening of the syringe. Size. Further, in order to engage the syringe, at least one of the handle portions (for example, the handle 50) can be detached from the other.

Next, the operation will be described. When the drive shaft 33 is displaced in the distal direction by operating the handle portion 24 in the punch forceps of FIGS. 9 to 12, the receiving jaw 27 also moves in the distal direction. The movable jaw 26 is rotated and closed with respect to the support portion 25 via the fulcrum pin 30. At this time, even if there is a gap between the fulcrum pin 30 and the movable jaw 26 (or the receiving jaw 27), the top 38 of the opening groove 32 and the top 39 of the movable jaw 26 move so as to approach each other, so that the gap at the top is Is gone. Conversely, when the drive shaft 33 is moved in the proximal direction, the movable jaw 26 raises its top 39 in the proximal direction, ie, rearward, and
A space can be created between the movable jaw 7 and the movable jaw 26 to sandwich the tissue to be cut.

Further, the lower surface of the movable jaw 26 is
When the shape of the top portion 39 is processed by making the shape on the same straight line as 0, the accuracy can be further improved. In addition, not only the lower surface of the movable jaw 26 but also the upper surface of the receiving jaw 27 are aligned with the fulcrum pin 30 so that the receiving jaw 2
The shape of the top 38 of the 7 and the top 39 of the movable jaw 26 can be easily processed to the same shape, and the cutting ability can be enhanced.

When the drive shaft 43 is displaced in the proximal direction, the punch jaw shown in FIG.
2 close so that they approach each other. The operation unit shown in FIG. 15 can engage a syringe by detaching and attaching one of the handle units 47.

According to the first disclosed example, even if the drive shaft is displaced in the distal direction and the movable jaw closes and there is a gap in the fulcrum pin, the tops of the movable jaw and the receiving jaw approach each other, Eliminating the gap can increase the cutting ability. In this case, since the moving direction of the drive shaft is the same as that of the punch forceps, the operation unit can be shared with the punch forceps. By tightening the screw, it is possible to prevent the opening groove from widening when the opening groove is fitted with the movable jaw, thereby preventing the cutting ability from being reduced. Further, it is possible to simultaneously adjust the width of the opening groove and the width of the movable jaw which affect the cutting ability.

The effect of the second disclosed example is the same as that of the first disclosed example, and the excision ability can be increased while displacing the drive shaft in the proximal direction. In addition, since the stopper pin is provided in the distal forceps section, there is no need for a means for preventing the operation section from excessively tightening the movable jaw.

According to the third disclosed example, the leading end of FIG.
By bending as shown in (b), the range of the affected area that can be reached is wider than that of a conventional linear cup forceps. According to the fourth disclosure, water can be supplied into the insertion portion by the syringe, and washing can be easily performed.

According to the disclosed example, the following configuration is obtained. (Supplementary Note 7) A support portion that supports the movable jaw provided at the tip of the elongated insertion portion, and an opening groove that is connected to the drive shaft and has an apex formed of a polygon or a part of a circumference, A receiving jaw that cuts tissue by fitting the movable jaw and the opening groove, and a supporting pin that is pivotally supported by the supporting portion and that is rotatably connected to the receiving jaw in at least one place;
A movable jaw having the same shape as the top of the opening groove; and when the drive shaft is displaced in a direction opposite to the direction in which the top of the movable jaw faces, the receiving jaw moves in the same direction. Surgical forceps with movable jaws closed.

(Supplementary note 8) The surgical forceps according to Supplementary note 7, wherein a top portion of the movable jaw faces in a proximal direction. (Supplementary note 9) The surgical forceps according to Supplementary note 1 or 2, wherein, when the drive shaft is displaced in the distal direction, the receiving jaw moves in the distal direction and the movable jaw closes.

[0058]

As described above, according to the present invention, regardless of the hardness and size of the tissue, regardless of the tissue to be treated, that is, what is the opening angle of the treatment section at the distal end? Even in such a state, the excessive force applied to the operation unit is not applied to the treatment unit, and the deformation or destruction of the treatment unit can be prevented.

[Brief description of the drawings]

FIG. 1 is an overall side view of a forceps showing a first embodiment of the present invention.

FIG. 2 is a partially sectional side view showing the operation unit of the forceps of the embodiment.

3A and 3B show an operation unit of the forceps according to the embodiment, wherein FIG. 3A is a longitudinal side view, and FIG. 3B is a cross-sectional view along AA.

FIG. 4 is an operation explanatory view of the embodiment.

FIG. 5 is a graph showing the relationship between the amount of force applied to the operation unit of the embodiment and the strain of the leaf spring.

FIG. 6 is a graph showing the relationship between the amount of force applied to an operation unit and the strain of a leaf spring according to the second embodiment of the present invention.

FIG. 7 is a graph showing the relationship between the amount of force applied to the operation unit and the strain of the leaf spring according to the third embodiment of the present invention.

FIG. 8 is a longitudinal sectional side view showing an operation unit of the forceps of the embodiment.

FIG. 9 is an overall side view of the punch forceps of the first disclosure example.

FIG. 10 shows a tip portion of the punch forceps of the example of the disclosure,
(A) is a vertical cross-sectional side view of the tip portion, (b) is a BB cross-sectional view,
(C) is a CC sectional view, and (d) is a DD sectional view.

FIG. 11 is a perspective view of a distal end portion of the disclosure example.

FIG. 12 is an exploded perspective view of a distal end portion of the disclosure example.

FIG. 13 shows a tip portion of a punch forceps according to a second disclosure example;
(A) Side view when the movable jaw is closed, (b) is a side view when the movable jaw is opened.

FIG. 14 shows a distal end portion of the cup forceps of the third disclosure example,
(A) is a side view of the tip, (b) is a partial cross-sectional view taken along EE,
(C) is FF sectional view.

FIG. 15 is a side view of the operation unit according to the fourth disclosure example;

16A and 16B show a tip portion of a conventional punch forceps, in which FIG. 16A is a side view, and FIG. 16B is a cross-sectional view along line GG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Insertion part 2 ... Treatment part 3 ... Operation part 4 ... Fixed side operation part 5 ... Movable side operation part 6 ... Leaf spring (elastic means) 10 ... Operation rod (transmission means) 12, 13 ... Stopper screw (stop means)

Claims (1)

[Claims] 1. An insertion part to be inserted into a living body, a treatment part for treating a tissue at a distal end side of the insertion part, and a fixed side operation part and a movable side operation part provided at a hand side of the insertion part. And a transmitting means for transmitting the operating force of the movable side operating section to the treatment section, wherein the forceps provided on the movable side operating section actuate the transmitting section in the closing direction of the treatment section. Means for stopping the movement of the movable-side operation unit when the elastic force of the elastic unit is smaller than at least a part of the destructive force between the transmission unit and the treatment unit in a state where the treatment unit is closed. A forceps comprising a stop means.