WO2013080462A1

WO2013080462A1 - Affixation device

Info

Publication number: WO2013080462A1
Application number: PCT/JP2012/007264
Authority: WO
Inventors: 英徳野中
Original assignee: 株式会社ユニメディック
Priority date: 2011-11-29
Filing date: 2012-11-13
Publication date: 2013-06-06
Also published as: JP2013111220A

Abstract

[Problem] To provide an affixation device configured so that an affixed state can be more firmly maintained and so that an affixation section is compact. [Solution] An affixation device is provided with a pair of tube-shaped arm sections (15a, b) each having a short cylinder-shaped base section (12a, b) at one end thereof and a universal joint section (14a, b) at the other end thereof. The affixation device is configured so that the operation of affixing an operation section (17) causes a pair of pressing blocks (22a, b) to come into contact with the sloped sections (19a, b) of a pair of rods (21a, b) to separate the rods from each other, thereby affixing the universal joint sections (14a, b), and so that the operation of releasing the operation section releases the affixation of the universal joint sections. Engagement sections (25a, b) which can engage with each other to restrict the relative pivoting of the tube-shaped arm sections (15a, b) are formed on the contact surfaces (24a, b) of the short cylinder-shaped base sections (15a, b). The engagement sections are provided with a large number of radially continuous protrusions (26a, b).

Description

Fixing device

The present invention relates to a fixing device, and more particularly, to a fixing device used for placing and fixing a surgical instrument such as a retractor in a desired position in a surgical operation.

In a surgical operation performed by incising a part of the body such as a heart operation, a surgical instrument such as a retractor or a retractor is used, and the operation is performed while the incised part is kept in an expanded state.

In the surgical operation as described above, a joint support structure disclosed in Japanese Patent No. 4183899 (Patent Document 1) is known as a device for arranging and fixing a surgical instrument such as a retractor in a desired position. .

The joint support structure 50 disclosed in the above-mentioned patent document 1 has half-

cut portions

52a and 52b of a substantially short cylindrical shape at one

end portions

51a and 51b, and a universal joint portion 54a and the

other end portions

53a and 53b. 54b and a pair of

arm portions

56a and 56b in which

push rods

55a and 55b are disposed, and the pair of

arm portions

56a and 56b rotate relative to each other in the

half portions

52a and 52b of the activation block. They are arranged so as to overlap.

The

halves

52a and 52b of the activation block are rotatably fixed by a drawing bolt 57 and a nut element 58 to form an activation block 59. The pull-out bolt 57 can be rotated by a T-bar 60 fixed to the pull-out bolt 57. By rotating the T-bar 60, the fixing operation and the unlocking operation of the pair of

arm portions

56a and 56b can be performed. It can be carried out.

Inside the starting block 59,

toggle lever plates

61a and 61b capable of pressing the pair of

push rods

55a and 55b are housed, and the pair of

arm portions

56a and 56b are fixed by the fixing operation of the T bar 60. And the

toggle lever plates

61a and 61b press the

push rods

55a and 55b, respectively. Further, the fixing of the T bar 60 releases the rotation of the

arms

56a and 56b, and the pressing of the

push rods

55a and 55b by the

toggle lever plates

61a and 61b is released.

The universal

joint portions

54a and 54b include fastening

jaws

62a and 62b that can be pressed by the

push rods

55a and 55b,

spherical fastening members

63a and 63b that can be pressed by the fastening

jaws

62a and 62b, and the spherical fastening member, respectively. A ball sleeve 65a having

cup portions

64a and 64b that can clamp the

spherical fastening members

63a and 63b together with the fastening

jaws

62a and 62b and fix the operation of the

spherical fastening members

63a and 63b when the 63a and 63b are pressed. , 65b.

That is, when the

fastening jaws

62a and 62b are pressed by the

push rods

55a and 55b, the movement of the

spherical fastening members

63a and 63b is fixed, so that the movement of the

universal joints

54a and 54b is fixed. Is done.

Therefore, by performing the fixing operation using the T bar 60, the rotation of the pair of

arm portions

56a and 56b is fixed, and the

toggle lever plates

61a and 61b press the

push rods

55a and 55b, respectively. Then, the operation of the universal

joint portions

54a and 54b is fixed.

Further, by performing the fixing release operation using the T bar 60, the

arm portions

56a and 56b can be rotated and the universal

joint portions

54a and 54b are released from being fixed.

Therefore, the joint support structure 50 can simultaneously fix the rotation of the

arm portions

56a and 56b and the universal

joint portions

54a and 54b by the fixing operation by the T lever 60. Further, the fixing release operation by the T-lever 60 can simultaneously release the rotation of the

arms

56a and 56b and release the fixing of the

universal joints

54a and 54b.

When the joint support structure 50 is used for a surgical operation, one of the universal joints 54a is attached to a fixed part (not shown) such as a rail around the operating table, and the joint support structure 50 is attached to the fixed part. Fix it.

The other universal joint portion 54b of the joint support structure 50 is provided with a surgical instrument fixing member 66 for attaching a surgical instrument, and the surgical instrument fixing member 66 is a surgical instrument such as a retractor. (Not shown) is fixed and used.

The joint support structure 50 fixed around the operating table can freely move the

universal joints

54a and 54b in a state where the rotation of the

arms

56a and 56b by the T bar 60 is released, By rotating the pair of

arm portions

56a and 56b, the surgical instrument can be disposed at a desired position, and then the surgical instrument is fixed by performing a fixing operation with the T lever 60. It can be fixed to the position to do.

The rotation of the pair of

arm portions

56a and 56b of the joint support structure 50 is restricted by the frictional force acting on the

contact surface portions

68a and 68b with which the

housings

67a and 67b of the activation

block half portions

52a and 52b abut. Usually, the fixing of the rotation of the

arm portions

56a and 56b is not released without the fixing releasing operation of the T-bar 60 being performed.

However, during surgery, a doctor's body comes into contact with a part of the joint support structure 50 or a surgical instrument fixed to the joint support structure 50, and a force is applied to release the fixation of the

arms

52a and 52b. In such a case, there is a problem that the operation is interrupted because the fixation of the

arm portions

52a and 52b is released without performing the fixation release operation by the T bar 60.

Further, the rotation of the

arm portions

52a and 52b is regulated by the frictional force acting on the

contact surface portions

68a and 68b with which the

housings

67a and 67b abut. Therefore, the length dimension of the

arm portions

52a and 52b is set. To increase the size, it is necessary to increase the frictional force that restricts the rotation of the

arm portions

52a and 52b, and it is necessary to increase the area of the

contact surface portions

68a and 68b.

Accordingly, in order to increase the length of the

arm portions

52a and 52b, the joint support structure 50 needs to increase the area of the

contact surface portions

68a and 68b. There was a problem of getting in the way of surgery.
Japanese Patent No. 4183899

Therefore, an object of the present invention is to provide a fixing device that can maintain the fixed state more firmly and can reduce the size of the fixing portion.

In order to solve the above-mentioned problems, a fixing device according to the invention of claim 1 has a short cylindrical base at one end and a universal joint at the other end, and rotates with each other at the short cylindrical base. A pair of tubular arm portions that are arranged so as to overlap each other, a fixing portion that can fix the rotational movement of the tubular arm portion, and an operation portion that can fix the fixing portion. Each has an inclined portion disposed in the short cylindrical base portion at one end, and the other end abuts the universal joint portion so that the universal joint portion is fixed or released. A rod that moves is housed, and a pair of pressing blocks that can move the rod back and forth by contacting or separating from the inclined portion based on a fixing operation or a releasing operation of the operation portion are provided in the short cylindrical base portion. And the pair of the operation parts by the fixing operation. The pressure block comes into contact with the inclined portion and the pair of rods are separated from each other to fix the universal joint portion and to release the operation portion into contact with the contact portion of the pair of pressing blocks. In the fixing device configured to release the fixation of the universal joint portion from each other by releasing the contact, the contact surface portion of the short cylindrical base portion is engaged with each other. Engaging portions that can regulate the mutual rotation of the tubular arm portions are formed, and the pair of pressing blocks come into contact with the inclined portions by the fixing operation of the operation portion, and the pair of rods are separated from each other, respectively. The pair of tubular arm portions are fixed by fixing the universal joint portion and the engaging portions are engaged with each other, and the pair of rods are fixed to the universal joint portion by releasing the operation portion. With releasing, characterized in that it is configured to allow rotation of the pair of tubular arm by engagement of said engaging portion is released.

Therefore, the fixing device according to the invention of claim 1 has a short cylindrical base portion at one end portion and a universal joint portion at the other end portion, and is arranged so as to be rotatable with respect to each other at the short cylindrical base portion. A pair of tubular arm portions, a fixing portion that can fix the rotational movement of the tubular arm portion, and an operation portion that can fix the fixing portion, and each of the tubular arm portions has one end. In addition, an inclined portion disposed in the short cylindrical base portion is formed in the portion, and a rod that moves back and forth so that the other end portion contacts the universal joint portion to fix or release the universal joint portion is provided. In the short cylindrical base, a pair of pressing blocks that can move the rod back and forth by contacting or separating from the inclined portion based on a fixing operation or a releasing operation of the operating portion are incorporated. The pair of pressing blocks is tilted by the fixing operation. The pair of rods are separated from each other by being in contact with each other, and the universal joint portion is fixed, and the contact of the pair of pressing blocks with the contact portion is released by the release operation of the operation portion. Thus, since the pair of rods are configured to release the fixation of the universal joint portion, the pair of tubular arm portions can be rotated by performing the fixing operation of the fixing portion by the operation portion. The operation can be fixed, and the pressing block is in contact with the inclined portion of the rod disposed in the tubular arm portion, and is separated from each other by pressing the pair of rods, thereby fixing the universal joint portions, respectively. be able to.
Further, the fixing operation of the fixing portion by the operation portion can be performed to release the rotation of the pair of tubular arm portions, and the rod disposed in the tubular arm portion of the pressing block. By releasing the contact with the inclined portion, it is possible to release the fixing of the universal joint portion.

In the fixing device according to the first aspect of the present invention, an engaging portion that engages with each other and restricts the mutual rotation of the tubular arm portion is formed on the contact surface portion of the short cylindrical base portion. When the operation portion is fixed, the pair of pressing blocks abut against the inclined portion and the pair of rods are separated from each other, thereby fixing the universal joint portion and engaging the engagement portion with each other. Thus, the pair of tubular arm portions are fixed, and the pair of rods release the fixing of the universal joint portion by the release operation of the operation portion, and the engagement of the engagement portion is released to release the pair of the pair of rods. Since the tubular arm portions are configured to be rotatable, the engagement portions are engaged with each other by the fixing operation of the operation portion, whereby the pair of tubular arm portions are rotated relative to each other. Regulate the above pair It is possible to fix the tubular arm.
Further, the engagement of the engagement portion is released by the release operation of the operation portion, whereby the pair of tubular arm portions can be turned.

The fixing device according to a second aspect of the present invention is characterized in that the engaging portions are convex portions respectively formed on the contact surface portions of the short cylindrical base portions placed on top of each other.
Accordingly, the convex portions engage with each other.

In the fixing device according to a third aspect of the present invention, the contact surface portion is formed in an annular belt shape having a predetermined width dimension, and a plurality of the convex portions are radially formed continuously on the contact surface portion. It is characterized by being.
Accordingly, a large number of the convex portions engage with each other.

The fixing device according to a fourth aspect of the invention is characterized in that the convex portion is formed over the entire contact surface portion.
Accordingly, the convex portions formed over the entire contact surface portion engage with each other.

The fixing device according to a fifth aspect of the invention is characterized in that the convex portions are formed at intervals of 5 degrees.
Accordingly, the convex portions formed at intervals of 5 degrees are engaged with each other.

Therefore, since the convex portions are formed at intervals of 5 degrees, the angle formed by the pair of tubular arm portions can be adjusted at intervals of 5 degrees.

In the fixing device according to the first aspect of the present invention, the engaging portions engage with each other by the fixing operation of the operation portion, thereby restricting the mutual rotation of the pair of tubular arm portions. Since the arm portion can be fixed, when performing the fixing operation of the operation portion, a force that restricts the rotation of the pair of tubular arm portions acts on the contact surface portion of the short cylindrical base portion, and When the engaging portions engage with each other, the contact surface portions of the short cylindrical base portion can engage with each other to regulate the rotation of the pair of tubular arm portions, and as a result, are fixed. The fixed state can be reliably maintained, and the fixing portion can be reduced in size.

In the fixing device according to a second aspect of the present invention, since the engaging portion is a convex portion formed on the contact surface portion of the short cylindrical base portion placed on top of each other, the convex portion , The rotation of the tubular arm portion can be restricted.

In the fixing device according to a third aspect of the present invention, the contact surface portion is formed in an annular belt shape having a predetermined width dimension, and a plurality of the convex portions are radially formed continuously on the contact surface portion. Therefore, the pair of tubular arm portions can be rotated with respect to each other, and the angle formed by the pair of tubular arm portions can be adjusted in multiple stages, and the instrument fixed to the universal joint portion can be adjusted to a desired position. Can be arranged.

In the fixing device according to a fourth aspect of the invention, since the convex portion is formed over the entire contact surface portion, the angle formed by the tubular arm portion of the fixing device is adjusted in multiple steps over the entire region. can do.

In the fixing device according to the fifth aspect of the invention, the angle formed between the pair of tubular arm portions can be adjusted at intervals of 5 degrees, and as a result, the angle formed between the pair of tubular arm portions is substantially reduced. Can be adjusted steplessly.

It is a perspective view which shows the fixing device in one Embodiment of the fixing device which concerns on this invention. It is the side view which shows the fixing device in one Embodiment of the fixing device which concerns on this invention, and the enlarged view which partially enlarges and shows the contact surface part of an end cylindrical base. FIG. 3 is a cross-sectional view taken along the line 3-3 of FIG. 1 showing the fixing device in the embodiment of the fixing device according to the present invention. It is a perspective view which shows the short cylindrical base part in one Embodiment of the fixing device which concerns on this invention. It is a perspective view which shows the short cylindrical base part in one Embodiment of the fixing device which concerns on this invention. It is a longitudinal cross-sectional view which shows the conventional joining support structure.

Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.

As shown in FIGS. 1 and 2, the fixing device 10 according to the present embodiment includes a tubular arm portion 15a having a short cylindrical base portion 12a at one end portion 11a and a universal joint portion 14a at the other end portion 13a. The one end portion 11b has a short cylindrical base portion 12b, and the other end portion 13b has a tubular arm portion 15b having a universal joint portion 14b. The pair of

tubular arm portions

15a and 15b is composed of the short cylindrical base portion. 12a and 12b are arranged so as to be rotatable with respect to each other.

As shown in FIGS. 1 and 2, the fixing device 10 includes a fixing portion 16 that can fix the rotation of the

tubular arm portions

15 a and 15 b, and a side surface that can fix the fixing portion 16. And a T-shaped operation unit 17.

As shown in FIG. 3, in the

tubular arm portions

15a and 15b,

inclined portions

19a and 19b disposed in the short

cylindrical base portions

12a and 12b are formed at one

end portions

18a and 18b, respectively.

Rods

21a and 21b that move back and forth so that the

ends

20a and 20b abut against the

universal joints

14a and 14b to fix or release the

universal joints

14a and 14b are provided.

Further, as shown in FIG. 3, the short

cylindrical base portions

12a and 12b have inclined

portions

23a and 23b that can come into contact with the

inclined portions

19a and 19b, and the operation portion 17 is fixed or released. Based on the above, a pair of pressing

blocks

22a, 22b that can move the

rods

21a, 21b back and forth by abutting or separating from the

inclined portions

19a, 19b are provided.

As shown in FIG. 3, in the fixing device 10, the pair of pressing

blocks

22a and 22b abut against the

inclined portions

19a and 19b by the fixing operation of the operation unit 17, and the pair of

rods

21a and 21b are pivoted to each other. The universal

joint portions

14a and 14b are fixed apart from each other in the direction, and the contact of the pair of pressing

blocks

22a and 22b with the

inclined portions

19a and 19b is released by the release operation of the operation portion 17. As a result, the pair of

rods

19a and 19b are configured to release the fixing of the universal

joint portions

14a and 14b.

As shown in FIGS. 4 and 5, the

contact surface portions

24a and 24b of the short

cylindrical base portions

12a and 12b are engaged with each other to regulate the mutual rotation of the

tubular arm portions

15a and 15b.

Engaging portions

25a and 25b are formed.

As shown in FIG. 3, in the fixing device 10, the pair of pressing

blocks

22 a and 22 b come into contact with the

inclined portions

19 a and 19 b by the fixing operation of the operation unit 17, and the pair of

rods

21 a and 21 b are separated from each other. Then, the universal

joint portions

14a and 14b are fixed, respectively, and the pair of

tubular arm portions

15a and 15b are fixed by engaging the engaging

portions

25a and 25b with each other as shown in FIG.

Further, in the fixing device 10, the pair of

rods

19 a and 19 b release the universal

joint portions

14 a and 14 b from each other and the

engagement portions

25 a and 25 b are disengaged by the release operation of the operation portion 17. Accordingly, the pair of

tubular arm portions

15a and 15b can be turned.

As shown in FIGS. 2, 3 and 4, the engaging

portions

25a and 25b are respectively formed on the

contact surface portions

24a and 24b of the short

cylindrical base portions

12a and 12b placed on top of each other. The

convex portions

26a and 26b have a triangular cross section.

As shown in FIGS. 3 and 4, the

contact surface portions

24a and 24b are formed in an annular band shape having a predetermined width dimension, and the

convex portions

26a and 26b are radially formed on the

contact surface portions

24a and 24b. Are formed in succession.

Further, as shown in FIGS. 3 and 4, the

convex portions

26a and 26b are formed at intervals of 5 degrees over the entire

contact surface portions

24a and 24b.

As shown in FIG. 1, a fixing member 27 that can fix the fixing device 10 to a rail member (not shown) around the operating table is attached to the universal joint portion 14a, and the universal joint portion 14b. A device fixing member 28 that can fix a surgical device (not shown) such as a wound wound is attached.

As shown in FIG. 3, the universal

joint portions

14a and 14b are respectively connected to the

cup portions

29a and 29b that come into contact with the

other end portions

20a and 20b of the

rods

21a and 22b, and the cup portions on the one

end portions

30a and 30b. The universal

joint shaft portions

32a and 32b having

spherical portions

31a and 31b that can come into contact with 29a and 29b, the

cup portions

29a and 29b, and the

spherical portions

31a and 31b, and the universal

joint shaft portions

32a and 32b It is comprised by the

cover parts

33a and 33b which have the

opening parts

36a and 36b which can protrude outward.

Further, as shown in FIG. 3, the abutting

surface portions

34a and 34b of the

cup portions

29a and 29b with the

spherical portions

31a and 31b and the abutting surface portions of the inner surfaces of the

cover portions

33a and 33b with the

spherical portions

29a and 29b. 35a and 35b have the same curvature as the

spherical portions

31a and 31b.

As shown in FIG. 4, a cylindrical operation shaft portion 37 is integrally formed with the pressing block 22 a, and an outer peripheral surface portion 38 above the operation shaft portion 37 is screwed into the operation portion 17. A screwing portion 39 is provided, the upper end of the operation shaft portion 37 is opened, and an inner surface portion 40 is formed. The inner surface portion 40 is formed with a screwing portion 42, and FIG. As shown in FIG. 3 and FIG. 3, an operation portion fixing screw 41 that prevents the operation portion 17 from rotating more than a predetermined amount during the unlocking operation of the operation portion 17 is screwed into the screw portion 42. Fixed.

Further, as shown in FIG. 5, the pressing block 22b is formed with a through-hole portion 43 having a diameter that is substantially the same as the outer dimension of the operation shaft portion 37. As shown in FIG. The operation shaft portion 37 is inserted into the through-hole portion 43, and the short

cylindrical base portions

12a and 12b are disposed so as to overlap each other.

As shown in FIG. 3, the fixed portion 16 is composed of the short

cylindrical base portions

12a and 12b and the

pressing blocks

22a and 22b disposed in the short

cylindrical base portions

12a and 12b. The operating portion 17 is rotatably engaged with the threaded portion 39 of the operating shaft portion 25 formed integrally with the pressing block 22a and inserted through the through-hole portion 43 of the pressing block 22b. Has been placed.

The fixing operation of the fixing device 10 is performed by rotating the operation unit 17 in the tightening direction. When the operation portion 17 is rotated in the tightening direction, the operation portion 17 and the screwing portion 39 of the operation shaft portion 37 are screwed together, and the

pressing blocks

23a and 23b are tightened to approach each other. Then, by fixing the fixing portion, the rotation of the pair of

tubular arm portions

15a and 15b is fixed, and the

inclined portions

23a and 23b of the

pressing blocks

22a and 22b are inclined to the

rods

21a and 21b. The

rods

21a and 21b are separated from each other by contacting the

portions

19a and 19b, respectively.

The

rods

21a and 21b separated from each other press the

cup portions

29a and 29b of the universal

joint portions

14a and 14b, respectively, and the pressed

cup portions

29a and 29b turn the

spherical portions

31a and 31b into the cover portion 33a, By pressing against the

contact surface portions

35a and 35b of 33b, the operation of the

spherical portions

31a and 31b is fixed, and the universal

joint portions

14a and 14b are fixed.

Therefore, the fixing device 10 performs the fixing operation of rotating the operation portion 17 in the tightening direction, whereby the rotation of the pair of

tubular arm portions

15a and 15b is fixed and the universal

joint portions

14a and 14b. Is fixed.

In this case, the

convex portions

26a and 26b provided on the

contact surface portions

24a and 24b of the short

cylindrical base portions

12a and 12b are engaged with each other, and the rotation of the

tubular arm portions

15a and 15b is firmly restricted. is doing.

Hereinafter, the operation of the fixing device 10 according to the present embodiment will be described.

As shown in FIG. 2, the fixing device 10 can be engaged with the

contact surface portions

24a and 24b of the short

cylindrical base portions

12a and 12b, respectively, to restrict the rotation of the

tubular arm portions

15a and 15b. Since the

convex portions

25a and 25b having a triangular cross section are formed, when the fixing operation is performed by the operation portion 17, the

convex portions

26a and 26b are spaced from each other in the

contact surface portions

24a and 24b. By engaging with each other, the fixing portion 16 is firmly fixed.

Therefore, when the fixing operation by the operation unit 17 is performed, the fixing unit 16 is firmly fixed. Therefore, the rotation of the pair of

tubular arm portions

15a and 15b and the universal

joint portions

14a and 14b are performed. The state where the operation is fixed is firmly maintained.
Further, as shown in FIG. 6, the rotation of the

arm portions

56a and 56b is regulated by the friction acting on the smooth

contact surface portions

68a and 68b of the

half portions

52a and 52b of the activation block. Unlike the joint support structure 50, as shown in FIG. 2, the

convex portions

26a and 26b can be engaged with each other and the fixed portion 16 can be reliably maintained. Can be miniaturized.

The

convex portions

26a and 26b respectively formed on the

contact surface portions

24a and 24b of the short

cylindrical base portions

12a and 12b of the fixing device 10 are radially continuous over the entire area of the

contact surface portions

24a and 24b. Therefore, the angle formed by the pair of

tubular arm portions

15a and 15b can be adjusted in multiple stages over the entire area.

Further, since the

convex portions

26a and 26b are formed at intervals of 5 degrees, the angle formed by the pair of

tubular arm portions

15a and 15b can be adjusted at intervals of 5 degrees.

Therefore, the fixing device 10 can adjust the angle formed by the pair of

tubular arm portions

15a and 15b substantially continuously over the entire region.

When the fixing device 10 is used in a surgical operation, the fixing member 27 attached to the universal joint portion 14a is fixed to a rail member (not shown) around the operating table and attached to the universal joint portion 14b. A surgical instrument (not shown) such as a retractor is fixed to the instrument fixing member 28 thus used.

In this case, the universal

joint portions

14a and 14b can be moved freely, and the angle formed by the pair of

tubular arm portions

15a and 15b can be adjusted steplessly over the entire region. The instrument can be placed at a desired location.

Further, by performing the fixing operation by the operation unit 17, the state in which the rotation of the pair of

tubular arm portions

15a and 15b and the operation of the universal

joint portions

14a and 14b are fixed is firmly maintained. The surgical instrument can be operated with the surgical instrument firmly fixed at a desired position, and the doctor's body is fixed to a part of the fixing device 10 or the fixing device 10 during the operation. There is no possibility that the fixed rotation of the pair of

tubular arm portions

15a and 15b is released even when the pair of

tubular arm portions

15a and 15b come into contact.

In the present embodiment, the case where the fixing device 10 is used for fixing a surgical instrument has been described. However, the fixing device 10 is not limited to a surgical instrument, and various devices such as a camera and a dial gauge. It is also possible to use for fixing.

The present invention is widely applicable not only to surgical instruments but also to fixing devices that fix various devices such as cameras and dial gauges.

DESCRIPTION OF SYMBOLS 10 Fixing device 11a One end part 11b One end part 12a Short cylindrical base part 12b Short cylindrical base part 13a Other end part 13b Other end part 14a Universal joint part 14b Universal joint part 15a Tubular arm part 15b Tubular arm part 16 Fixed part 17 Operation part 18a One end portion 18b One end portion 19a Inclined portion 19b Inclined portion 20a The other end portion 20b The other end portion 21a Rod 21b Rod 22a Press block 22b Press block 23a Inclined portion 23b Inclined portion 24a Abutting surface portion 24b Abutting surface portion

25a Engaging portion

25b Engagement Part 26a convex part 26b convex part 27 fixing member 28 instrument fixing member

29a cup part

29b cup part 30a one end part 30b one end part 31a spherical part 31b spherical part 32a universal joint shaft part 32b universal joint shaft part 33a cover part
33b Cover portion 34a Contact surface portion 34b Contact surface portion 35a Contact surface portion 35b Contact surface portion

36a Opening portion

36b Opening portion 37 Operation shaft portion 38 Outer peripheral surface portion 39 Screwing portion 40 Inner surface portion 41 Operating portion fixing screw 42 Screwing portion 43 Through Hole

50 Joint support structure 51a One end 51b One end 52a Start block half 52b Start block half 53a Other end 53b Other end 54a Universal joint 54b Universal joint 55a Push rod 55b Push rod 56a Arm 56b Arm 57 Pull-out bolt 58 Nut element 59 Start block 60 T bar 61a Toggle lever plate 61b Toggle lever plate

62a Fastening jaw

62b Fastening jaw 63a Spherical fastening member 63b Spherical fastening member

64a Cup part

64b Cup part

65a Ball sleeve

65b Ball sleeve 66 Surgical instrument Fixed member 67a Housing 67b Housing 68a Contact surface portion 68b Contact surface portion

Claims

A short cylindrical base portion at one end portion and a universal joint portion at the other end portion, a pair of tubular arm portions disposed so as to be rotatable with respect to each other at the short cylindrical base portion, and a pair of tubular arm portions A fixing portion capable of fixing the rotation operation and an operation portion capable of fixing the fixing portion;
Each of the tubular arm portions is formed with an inclined portion disposed in the short cylindrical base portion at one end, and the other end abuts the universal joint portion to fix or release the universal joint portion. And a pair of rods that can move the rod back and forth in contact with or away from the inclined portion based on a fixing operation or a release operation of the operation portion. A pressing block is installed,
The pair of pressing blocks come into contact with the inclined portion by the fixing operation of the operation portion and the pair of rods are separated from each other, respectively, to fix the universal joint portion, and to release the pair of the pair by releasing operation of the operation portion. In the fixing device configured to release the fixation of the universal joint portion from each other by releasing the contact of the pressing block with the contact portion,
On the contact surface portion of the short cylindrical base portion, an engagement portion that can engage with each other and restrict the mutual rotation of the tubular arm portion is formed,
By the fixing operation of the operation part, the pair of pressing blocks come into contact with the inclined part and the pair of rods are separated from each other, respectively, fixing the universal joint part and engaging the engaging part with each other. Fixing the pair of tubular arm portions,
The pair of rods release the fixing of the universal joint portion by the release operation of the operation portion, and the engagement of the engagement portion is released to enable the pair of tubular arm portions to rotate. A fixing device which is configured.
The fixing device according to claim 1, wherein the engaging portions are convex portions respectively formed on the contact surface portions of the short cylindrical base portions placed on top of each other.
3. The contact surface portion according to claim 2, wherein the contact surface portion is formed in an annular belt shape having a predetermined width dimension, and a plurality of the convex portions are radially formed continuously on the contact surface portion. Fixing device.
4. The fixing device according to claim 3, wherein the convex portion is formed over the entire contact surface portion.
The fixing device according to claim 4, wherein the convex portions are formed at intervals of 5 degrees.