JP2000229089A - Powder filling equipment - Google Patents

Abstract

(57) [Summary] [Problem] To provide a powder filling device capable of transferring an appropriate amount of powder to a target site in a living body and filling the same in a simple state by a simple operation. A powder filling device (1) according to the present invention includes a cylindrical body (2), a push rod (5) inserted into a lumen (21) of the cylindrical body (2), and a powder storing section (7) for storing powder. ing. The tubular body 2 has a distal opening 22, a proximal opening 23, and a side hole 24. The powder storage unit 7 includes a housing 71 defining a powder storage space 72.
And an arc-shaped shielding plate 74 connected or integrated with the housing
And By rotating the cylindrical body 2 relative to the powder storage unit 7, the state in which the lumen 21 of the cylindrical body and the powder storage unit 7 communicate with each other via the side hole 24 and the state in which the cylindrical body 21 is closed are cut off. You can choose. A rounded powder pressing portion 51 is formed at the distal end portion of the push-in bar 5, and a grip portion 52 is fixed to a base end portion of the push-in bar 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder filling device for inserting and filling a powder such as a ceramic powder into a target site in a living body.

[0002]

2. Description of the Related Art Hydroxyapatite is used as a dental or medical bone substitute because of its excellent biocompatibility. Conventionally, as bone filling materials, there are a granular material and a block-like material that has been formed into a predetermined shape in advance, but the former can be used by filling a defective portion having an arbitrary shape, and the latter can be used. It is necessary to mold and use a material that matches the shape of the defective part.

[0003] When a granular bone substitute is used, the granules are transported from the outside of the body to a bone defect site (target site) in a living body and filled therein, but when the bone defect site is deep, the granule is transported to the bone defect site. However, there is a problem that it is difficult to reliably fill an appropriate amount of granules because the desired amount of granules cannot be transported as intended due to dropping off during the transport of the tissue or the disturbed biological tissue near the bone defect.

In the field of dentistry, a method of adding physiological saline or the like to hydroxyapatite granules, mixing the resulting mixture, placing the mixture in a syringe (syringe), and injecting it into the affected part by a pressing operation of a plunger is performed. Have been done. The reason why the hydroxyapatite granules are mixed with physiological saline or the like is to reduce friction on the inner surface of the injection cylinder and to enable injection by pressing a pusher.

[0005] However, in such a method, the operation for mixing physiological saline or the like into the granules is complicated, and skill is required to ensure the slidability between the granules and the wall surface of the syringe. In particular, there is no guarantee that proper adjustment work such as selection of the amount of physiological saline to be added can be performed with good reproducibility, and the above-mentioned object of reliably filling an appropriate amount of granules has not been achieved.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a powder filling device which can transfer an appropriate amount of powder to a target site in a living body and fill it with a simple operation. Is to do.

[0007]

This and other objects are achieved by the present invention which is defined below as (1) to (15).

(1) A cylindrical body having an open end, a push rod inserted into the bore of the cylindrical body and having a powder pressing portion at the tip end, and a powder housed therein. A powder filling device, comprising: a powder storage section defining a powder storage chamber that can communicate with the powder storage section.

(2) The powder filling device according to the above (1), further comprising shutter means for selecting communication / interruption between the inner cavity of the cylindrical body and the powder storage chamber.

(3) The shutter means includes a side hole formed in the cylindrical body, and a shielding plate rotatably mounted on the cylindrical body and capable of blocking the side hole. A) a powder filling device according to any one of the above.

(4) The powder filling device according to (3), wherein the shielding plate is connected to or integrated with the powder container.

(5) The powder filling device according to the above (2), further comprising positioning means for setting a communication state and a blocking state between the lumen of the cylindrical body and the powder storage chamber.

(6) The powder filling device according to the above (5), wherein the positioning means is a click mechanism.

(7) The powder filling device according to any one of (1) to (6), wherein the length of the push rod is longer than the length of the cylindrical body.

(8) The powder filling device according to any one of (1) to (7), wherein the push rod has a grip portion.

(9) The gripping portion abuts on an end of the cylindrical body opposite to the open end, and in this state, the powder pressing portion of the push-in rod is more than the open end of the cylindrical body. The powder filling device according to (8), which protrudes.

(10) The powder filling device according to the above (8) or (9), wherein the grip portion is adjustable in its longitudinal position with respect to the push rod.

(11) The powder filling device according to any one of (1) to (10), wherein the powder pressing portion is rounded.

(12) The above-mentioned (1), wherein a plurality of types of rods including the pushing rod are selectively inserted into the cylinder and used.
A powder filling device according to any one of (1) to (11).

(13) When the inner diameter of the cylindrical body is D ₁ , the outer diameter of the pushing rod is D ₂ , and the average particle diameter of the powder stored in the powder storage chamber is D ₃ , D ₁ − The powder filling device according to any one of the above (1) to (12), which satisfies a relationship of D ₂ ≦ D ₃ .

(14) The powder filling device according to any one of (1) to (13), wherein the powder is a powder made of ceramics.

(15) The powder filling device according to any one of the above (1) to (13), wherein the powder is a powder of a calcium phosphate compound.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a powder filling device of the present invention will be described in detail based on a preferred embodiment shown in the accompanying drawings.

FIGS. 1 and 2 are a side view and a plan view, respectively, of the powder filling device (in a communicating state) of the present invention, and FIGS.
4 is a side view of the powder filling device of the present invention (in a cutoff state), FIG.
Is a sectional view taken along line AA in FIG. 1, and FIG. 5 is a sectional view taken along line CC in FIG.
6 is a sectional view taken along line BB in FIG. 1, and FIG.
It is a side view which shows the state which inserted another rod-shaped body in the powder filling apparatus. Hereinafter, the right side in FIGS. 1 to 3 and FIG. 7 will be described as a “base end” and the left side as a “distal end”. 4 and 5, illustration of the push-in bar 5 is omitted.

As shown in FIGS. 1 to 6, a powder filling device 1 according to the present invention comprises a cylinder 2, a push rod 5 inserted into the inner cavity of the cylinder 2, and a powder for accommodating the powder. And a body storage unit 7.

The cylindrical body 2 is a tubular member whose both ends are open. Two hubs 3 and 4 are fixed to the base end of the cylindrical body 2 at predetermined intervals along the longitudinal direction of the cylindrical body 2. ing.

A push rod 5 is inserted into the inner cavity of the cylindrical body 2. The push-in rod 5 has a circular cross section, and a powder pressing portion 51 for pressing the powder is formed at a tip portion thereof.
The powder pressing portion 51 has a rounded shape. Thereby, when inserting into a living body, it can be inserted smoothly without damaging the living tissue.

The length of the push rod 5 is longer than the length of the cylinder 2, and when the push rod 5 is inserted into the cylinder 2, the distal end and the base end of the push rod 5 are respectively connected to the distal end of the cylindrical body 2. It is configured to protrude from the opening 22 and the base end opening 23.

A grip portion 52 is fixedly installed on the base end side of the push rod 5 by, for example, screwing or screwing. The push rod 5 is operated while holding the holding portion 52. The grip portion 52 is formed of a ring-shaped member having an outer diameter equal to or larger than the outer diameter of the cylindrical body 2, and an outer peripheral surface thereof is formed with irregularities (knurls) 53 having a non-slip function.

From the base opening 23 of the cylinder 2 to the lumen 2 of the cylinder 2
When the push rod 5 is inserted into the cylinder 1, the gripping portion 52 comes into contact with the base end of the cylinder 2, that is, the base end of the hub 4. It protrudes from the opening 22. When the grip portion 52 comes into contact with the hub 4, the push rod 5 cannot move further in the distal direction. Therefore, depending on the installation position of the grip portion 52 with respect to the push rod 5, the push rod 5 extends from the distal end opening 22 of the cylindrical body 2. The length of the projecting end can be restricted.

Thus, the length of the push rod 5 protruding from the distal end opening 22 of the cylindrical body 2 can always be kept constant. In particular, even when the distal end side of the push rod 5 is in a living body and cannot be visually recognized, it is simple. By operation, the protrusion length of the push rod 5 from the distal end opening 22 of the cylindrical body 2 can be made constant.

It is preferable that the holding portion 52 can adjust the fixed position in the longitudinal direction with respect to the push rod 5. Thereby, the protrusion length of the push rod 5 from the distal end opening 22 of the cylindrical body 2 can be adjusted according to the case or the like.

At a position corresponding to the powder container 7 of the cylindrical body 2, a side hole 24 penetrating the wall of the cylindrical body 2 is formed. The powder is supplied to the lumen 21 of the cylindrical body 2 through the side holes 24.

The hub 4 fixed to the base end of the cylinder 2 has
A notch 41 is formed. The notch 41 has a function of indicating the rotation angle of the cylindrical body 2 with respect to the powder storage unit 7, that is, the position of the side hole 24 with respect to the powder storage unit. When the notch 41 faces the powder storage unit 7 side (upward in FIG. 1), the side hole 24 faces the powder storage chamber 72 and is open (see FIGS. 1 and 4). When the notch 41 faces the opposite side (downward in FIG. 3) of the powder storage unit 7,
The side hole 24 is located on the opposite side of the powder storage chamber 72 and is in a shielded state (see FIGS. 3 and 5).

The hub 3 fixed to the distal end side of the hub 4 of the cylindrical body 2 has two concave portions 9 with which a ball 95 described later engages.
6 and 97 are formed. Both recesses 96 and 97 are
It is formed at 180 ° intervals, and one of the concave portions 96 is formed.
Are formed at the same positions as the side holes 24 when viewed in the rotation direction of the cylindrical body 2.

The powder container 7 is connected or integrated with the housing 71 and the lower end of the housing 71 (the end opposite to the powder inlet 73), and is formed into an arc shape (cylindrical shape). Shield plate 74
And

Inside the casing 71, a powder storage chamber 72 is formed as a space for storing powder. The upper end of the housing 71 in FIG. 1 is open, and a powder inlet 73 is formed. The volume of the powder storage chamber 72 is not particularly limited, but is 0.3 to 3 times the amount of the powder to be transferred to the target portion at one time.
It is preferably about twice, more preferably about 1 to 2 times. Specifically, about 0.6 to ⁶ cm ³ is preferable, and about 1 to ³ cm ³ is more preferable.

Although not shown, a lid may be provided to shield the powder inlet 73 when necessary.

The shielding plate 74 is installed rotatably with respect to the cylinder 2 so as to surround the outer periphery of the cylinder 2 between the hubs 3 and 4. Thus, the powder storage unit 7 can rotate relative to the cylinder 2 about the axis of the cylinder 2.
Further, since the shielding plate 74 is sandwiched between the hub 3 and the hub 4 and the position in the longitudinal direction of the cylindrical body 2 is regulated, the shielding plate 74 can rotate with respect to the cylindrical body 2. Can not move to.

The outer diameter of the shielding plate 74 is set substantially equal to the outer diameter of the hubs 3 and 4 (see FIGS. 1 to 3).

The powder filling device 1 has a shutter means 8 for selecting the communication / interruption between the inner cavity 21 of the cylindrical body 2 and the powder storage chamber 72. The shutter means 8 includes the side hole 24 and the shielding plate 74 described above.

The operation of the shutter means 8 is as follows. In the state shown in FIGS. 1 and 4, the side hole 24 faces the lower end of the powder storage chamber 72, and the powder storage chamber 72 communicates with the inner cavity of the cylindrical body 2 via the side hole 24. When the cylindrical body 2 is rotated by 180 ° with respect to the powder storage section 7 from this state, the side holes 24 move away from the powder storage chamber 72 and are shielded by the shielding plate 74 as shown in FIGS. Further, the opening at the lower end in FIG. 5 of the powder storage chamber 72 is also shielded by the outer peripheral surface of the cylindrical body 2.

Further, the powder filling device 1 is provided with the inner cavity 2 of the cylindrical body 2.
There is a positioning means 9 for setting a communication state and a blocking state between the first and the powder storage chambers 72, respectively. This positioning means 9 is constituted by a click mechanism. Hereinafter, the configuration will be described in detail with reference to FIGS. 1 and 6.

A spring accommodating chamber 91 for accommodating a spring 92 is formed at the tip end of the housing 71. This spring storage room 9
A coil-shaped spring 92 is housed in a compressed state. One end of the spring 92 is in contact with a set screw 93 screwed into the upper end of the spring storage chamber 91 in FIG. 6, and the other end of the spring 92 is in contact with the ball support member 94.

The ball support member 94 includes a ball (sphere).
95 is supported and fixed. The ball support member 94
At the lower end side of the spring storage chamber 91, it is installed so as to be movable in the expansion and contraction direction of the spring 92. The ball 94 is pressed against the outer peripheral surface of the hub 3 by the elastic force (biasing force) of the spring 92.

On the other hand, two concave portions 96 and 97 into which the ball 95 selectively engages (inserts) are formed on the outer peripheral surface of the hub 3.
Are formed at 180 ° intervals. One of the concave portions 96 is formed at the same position as the side hole 24 when viewed in the rotation direction of the cylindrical body 2.

As shown in FIGS. 1 and 6, when the ball 95 is urged downward in the figure by the elastic force (biasing force) of the spring 92 and is inserted into the concave portion 96, the side hole 2
4 is opened facing the powder storage chamber 72, and is positioned in a state where the lumen 21 and the powder storage chamber 72 are in communication (a state shown in FIG. 4). When the cylinder 2 is rotated relative to the housing 71 clockwise or counterclockwise from this state, the ball 95 separates from the concave portion 96 and moves relatively while being in contact with the outer peripheral surface of the hub 3, When rotated by 180 °, it is inserted into the concave portion 97 on the opposite side. Thereby, the side hole 24 is located on the opposite side to the powder storage chamber 72, is shielded near the bottom of the shielding plate 74, and the lumen 21 and the powder storage chamber 72 are shut off (shown in FIG. 5). State).

By providing such positioning means 9, it is possible to reliably set the communication state and the blocking state between the lumen 21 and the powder storage chamber 72, and to easily and surely set the respective states. Can be recognized.

The powder to be put into the powder storage chamber 72 (the term "powder" is a broad concept including powders, granules, fine flakes or needles, etc.) And the like are not particularly limited.) There is no particular limitation on the type, conditions, and the like, but powder of a material used as a biomaterial is preferable. Examples of such powders include powders made of various ceramics such as alumina, zirconia, and calcium phosphate compounds. Among them, calcium phosphate compounds are preferable. The calcium phosphate compound can exist stably in vivo for a long period of time, and is particularly excellent as a biomaterial.

As the calcium phosphate compound, for example,
If hydroxyapatite (Ca _Ten(PO_Four)₆(O
H)_Two), TCP (Ca_Three(PO_Four)_Two), Ca_TwoP_TwoO₇,
Ca (PO_Three)_Two, Ca_Ten(PO_Four)₆F_Two, Ca_Ten(P
O_Four)₆Cl_Two, DCPD (CaHPO_Four・ 2H_TwoO), C
a_FourO (PO_Four)_TwoAnd the like.
Can be used as a mixture of two or more.

The average particle size of the powder is not particularly limited, but is usually preferably about 0.05 to 4.0 mm.
It is more preferably about 0.1 to 2.0 mm.

Further, in the powder filling device 1 of the present invention,
The inner diameter of the cylindrical body 2 is D ₁ , the outer diameter of the push-in rod 5 (or a rod-shaped body such as a protruding rod 6 described later) is D ₂ , and the average particle diameter of the powder stored in the powder storage chamber 72 is D _3. In this case, it is preferable to satisfy the following relationship: D ₁ −D ₂ ≦ D ₃ . When D ₁ −D ₂ > D ₃ , when the powder is transferred by being pushed by the push rod 5 in the cylindrical body 2,
The powder may enter between the inner peripheral surface of the cylindrical body 2 and the outer peripheral surface of the push rod 5, and the sliding resistance (frictional force) may increase during the pressing operation of the push rod 5, thereby decreasing the operability. is there.

[0053] Incidentally, the inner diameter D ₁ of the cylindrical body 2 is not particularly limited, preferably about 4 to 15 mm, about 6~10mm is more preferable.

The constituent materials of the cylindrical body 2, the push-in bar 5 (or a rod-shaped body such as a protruding bar 6 described later) and the housing 71 are not particularly limited, and for example, various hard resins, various metal materials, glass materials, various materials Ceramic materials can be used, and among them, metal materials are preferable, and stainless steel is particularly preferable. When these are made of stainless steel, they are high-strength, resistant to impacts, and have heat resistance, so that they can sufficiently withstand heat when sterilizing instruments. In addition, since the sliding property between the inner peripheral surface of the cylindrical body 2 and the outer peripheral surface of the push rod 5 is excellent (low frictional force), the moving operation of the push rod 5 can be performed more easily.

The powder filling device 1 as described above can be used by selectively inserting a plurality of types of rods including the pushing rod 5 into the lumen 21 of the cylinder 2.

For example, as shown in FIG. 7, a protruding rod 6 having a sharp pointed portion (cutting edge) 61 at the distal end can be used by inserting it into the bore 21 of the cylindrical body 2.

In this case, the outer diameter of the protruding rod 6 is substantially equal to the outer diameter of the push rod 5, and the same protruding portion 52 is provided at the base end of the protruding rod 6. . For the same reason as described above, it is preferable that the holding portion 52 can adjust the fixing position in the longitudinal direction with respect to the protruding hole bar 6.

The rod-shaped body that can be selectively inserted into the bore 21 of the cylindrical body 2 and used is not limited to the above-mentioned one, and any rod-shaped body can be used. Another push rod having a different shape of the pressing portion 51) may be used.

The rods such as the push-in rod 5 and the protruding rod 6 are
It is not limited to a solid one as shown, but may be a hollow one. The hollow rod-shaped body may be one having at least one end closed and one having both ends open. In the latter case, for example, a sheath (tube),
A catheter tube and the like can be mentioned.

As described above, in the powder filling device 1, each of a plurality of types of rods can be selectively inserted into the cylinder 2 for use, so that the distal end of the cylinder 2 can be used in a living body. The rod-shaped body to be inserted therein can be exchanged and used while being inserted into the device, so that the operation can be performed quickly and efficiently, and the burden on the patient during the operation can be reduced.

Next, an example of a method of using the powder filling device 1 will be described. First, as shown in FIGS. 3 and 5,
The lumen 21 of the cylinder 2 and the powder storage chamber 72 are kept in a closed state, and in this state, an appropriate amount of powder such as hydroxyapatite is put into the powder storage chamber 72 from the powder input port 73. .

Next, while grasping the cylindrical body 2 (or the casing 71) with one hand, the distal end opening 22 thereof is made to approach the surgical site (operating field), and the grasping portion 52 of the protruding rod 6 is grasped with the other hand. Grasp,
The protruding rod 6 is inserted through the proximal opening 23 of the cylindrical body 2, and is moved in the distal direction so that the sharp portion 61 protrudes from the distal opening 22. Then, an operation of moving or rotating the protruding rod 6 in the front-rear direction is performed, and the target portion (bone defect portion) to be filled with the powder and the periphery thereof are sharpened by the sharp portion 61, and the like. Eliminate living tissue that interferes with filling.

In such an operation for removing the living tissue, since the maximum protruding length of the protruding rod 6 from the distal end opening 22 is regulated by the contact of the grip portion 52 with the hub 4, the living tissue is excessively removed. Pressing or puncturing is prevented and safety is high.

Further, during the operation of removing the living tissue, since the lumen 21 of the cylindrical body 2 and the powder storage chamber 72 are shut off, the powder enters the lumen 21 and the projecting rod 6, insert operation,
The movement operation is prevented from being hindered.

Next, the protruding rod 6 is pulled in the proximal direction, and
Remove from Next, the housing 71 is gripped and fixed with one hand,
The cylindrical body 2 is rotated by 180 ° in the predetermined direction with the other hand. Thereby, the bore 21 of the cylindrical body 2 and the powder storage chamber 72 are
4 and the powder in the powder storage chamber 72 is
, Falls into the lumen 21 of the cylindrical body 2 and flows therethrough.

Next, while holding the cylindrical body 2 (or the housing 71) with one hand, the gripping portion 52 of the push rod 5 is gripped with the other hand, and the push rod 5 is moved from the base end opening 23 of the cylindrical body 2. Insert and move towards the tip. As a result, the powder in the lumen 21 is pressed by the powder pressing portion 51 of the push rod 5, and is transferred inside the cylindrical body 2 in the distal direction.

When the push rod 5 is further advanced in the distal direction, the powder pressing portion 51 protrudes from the distal end opening 22, and the powder is supplied to the target portion (bone defect portion) and filled. At this time, the powder filled in the target portion is pressed by the powder pressing unit 51,
Its packing density can also be increased.

In such a powder filling operation, since the maximum protruding length of the push rod 5 from the distal end opening 22 is regulated by the contact of the grip portion 52 with the hub 4, excessive pressing must be performed. Is prevented and safety is high.

Further, since almost the entire amount of the powder stored in the powder storage chamber 72 can be transferred to the target portion without waste and filled, the target portion can be filled with an appropriate amount of powder.

Note that such a powder filling operation can be repeated a plurality of times. Further, the powder can be added to the powder storage chamber 72 and the powder filling operation can be performed again to increase the powder filling amount to the target portion from the initial target value, which is versatile. In particular, such an increase in the amount of powder (additional filling) can be performed while keeping the position of the distal end of the cylindrical body 2 as it is (without once removing the distal end of the cylindrical body 2 from the surgical site). Thus, the burden on the patient can be reduced.

When the operation of filling the powder is completed as described above, suturing, ligating and the like are performed on the operative site, and the operation is completed.

Although the powder filling device of the present invention has been described with reference to the illustrated embodiment, the present invention is not limited to this. For example, the shutter means may be constituted by a shielding plate capable of shielding / opening an opening through which the powder passes by sliding or rotating.

The powder filling apparatus of the present invention may have a plurality of powder storage chambers, in particular, a plurality of powder storage chambers capable of storing, for example, powders having different compositions or particle diameters.

[0074]

Next, specific examples of the powder filling device of the present invention will be described. The following examples are examples in which the present invention is applied to the treatment of distal radius fractures using a combination of artificial bone grafting and external fixation by small incision.

1. Cases The cases were 51-year-old men, 55-year-old women, and 61-year-old women. In each case, the dorsal cortex was crushed, and after reduction by manual reduction, a bone defect occurred. After fixation of the cast, relocation was recognized or relocation was expected.

2. Surgical procedure The surgical procedure was performed under finger trap (fing
The patient was suspended using an er trap, and the reduction position was confirmed under X-ray fluoroscopy. After installation, make a small incision of about 1 cm from the distal dorsal radius to reach the dorsal radial bone defect. Insert a spreader into the same part, and after reducing the dilatation, insert about 1 to 2 g of hydroxyapatite granules (average particle size: 1 to 3 mm) using a powder filling device having the structure shown in FIGS. The bone defect was filled.

The powder filling tool used was made of stainless steel (SUS304), and the inner diameter D _{1 of the} cylindrical body was 4.5.
mm (cross 0 to + 0.05 mm), the outer diameter D ₂ of the closet bar was 4.5 mm (cross -0.05~0mm).

After the operation, the external fixation was applied for 5 weeks, and then the dish was fixed for 1 week, and the range of motion training was started.

3. Measurement By X-ray measurement, the dorsal tilt angle (dorsal tilt: DT) and the volar tilt angle (voral til) before and after the operation (when confirming bone union)
t: VT) and radial tilt (RT). The results are shown in Table 1 below.

[0080]

[Table 1] Table 1

4. Results In cases, DT decreased from 12 ° to 0 °, in cases VT decreased from 13 ° to 3 °, and in cases VT
Decreased from 22 ° to 6 °, and in each case,
Symptoms improved. In all cases, no shortening was observed during external fixation and after removal.

As described above, when the powder filling device of the present invention is used for an unstable distal radius fracture with a large bone defect, an artificial bone graft can be obtained in a minimally invasive manner, and post-operative relocation and shortening are possible. It was confirmed that it was also effective for prevention.

Further, according to the powder filling device of the present invention,
The operation of filling the bone defect with powder can be performed extremely easily and accurately without erroneous operation, the operation time is reduced, and the burden on the patient is reduced.

[0084]

As described above, according to the powder filling device of the present invention, an appropriate amount of powder can be transferred to a target site in a living body and filled as it is. In addition, since the operability is excellent and easy to use, erroneous operation can be prevented and the operation time can be shortened.

Further, the powder filling device of the present invention has high safety when used on a living body, and reduces the burden on the patient during surgery.

[Brief description of the drawings]

FIG. 1 is a side view of a powder filling device (in a communicating state) of the present invention.

FIG. 2 is a plan view of the powder filling device (in a communicating state) of the present invention.

FIG. 3 is a side view of the powder filling device (in a shut-off state) of the present invention.

FIG. 4 is a sectional view taken along line AA in FIG.

FIG. 5 is a sectional view taken along line CC in FIG. 3;

FIG. 6 is a sectional view taken along line BB in FIG. 1;

FIG. 7 is a side view showing a state where another rod is inserted into the powder filling device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 powder filling device 2 cylindrical body 21 lumen 22 distal opening 23 proximal opening 24 side hole 3 hub 4 hub 5 push-in rod 51 powder pressing part 52 gripping part 53 unevenness 6 protruding hole rod 61 sharp part 7 powder storage part REFERENCE SIGNS LIST 71 housing 72 powder storage chamber 73 powder input port 74 shielding plate 8 shutter means 9 positioning means 91 spring storage chamber 92 spring 93 set screw 94 ball support member 95 ball 96 recess 97 recess

Claims (15)

[Claims] 1. A cylindrical body having an open end, a push rod inserted through an inner cavity of the cylindrical body and having a powder pressing portion at a distal end portion, for storing powder, and communicating with the inner cavity of the cylindrical body. A powder storage part defining a possible powder storage chamber. 2. The powder filling device according to claim 1, further comprising shutter means for selecting communication / interruption between the inner cavity of the cylinder and the powder storage chamber. 3. The shutter according to claim 2, wherein the shutter means includes a side hole formed in the cylindrical body, and a shielding plate rotatably provided with respect to the cylindrical body and capable of shielding the side hole. A powder filling device as described. 4. The powder filling device according to claim 3, wherein the shielding plate is connected to or integrated with the powder storage unit. 5. The powder filling device according to claim 2, further comprising positioning means for setting a communication state and a blocking state between the lumen of the cylindrical body and the powder storage chamber. 6. The powder filling device according to claim 5, wherein said positioning means is a click mechanism. 7. The powder filling device according to claim 1, wherein a length of the push rod is longer than a length of the cylindrical body. 8. The push rod has a grip portion.
A powder filling instrument according to any one of claims 1 to 7. 9. The gripping portion is in contact with an end of the cylindrical body opposite to the open end, and in this state, the powder pressing portion of the push rod protrudes from the open end of the cylindrical body. The powder filling device according to claim 8, wherein 10. The powder filling device according to claim 8, wherein the grip portion is adjustable in its longitudinal position with respect to the push rod. 11. The powder filling device according to claim 1, wherein the powder pressing portion is rounded. 12. A plurality of rods including the push-in rod are selectively inserted into the cylinder for use.
The powder filling device according to any one of the preceding claims. 13. When the inner diameter of the cylindrical body is D ₁ , the outer diameter of the push rod is D ₂ , and the average particle diameter of the powder stored in the powder storage chamber is D ₃ , D ₁ -D 13. The method according to claim 1, which satisfies a relationship of ₂ ≦ D _3.
The powder filling device according to any one of the above. 14. The powder filling device according to claim 1, wherein the powder is a powder made of ceramics. 15. The powder filling device according to claim 1, wherein the powder is a powder of a calcium phosphate compound.