JP2015228909A - Package for carbon dioxide absorbent and carbon dioxide absorbent unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a package for carbon dioxide absorbents and a carbon dioxide absorbent unit preventing a circulation gas to pass therethrough and favorably bringing the circulation gas into contact with carbon dioxide absorbent.SOLUTION: A package 40 for carbon dioxide absorbents includes a net 43 that is formed into a cylindrical shape with a bottom part 43a, can store granular carbon dioxide absorbents 42 and can close an upper opening part; and a bottom plate 45 that is interposed between the bottom part 43a of the net 43 and the carbon dioxide absorbents 42 and placed on a disk-shaped ventilation part 35 provided on a flow path 32 of a cylindrical canister body 30. The bottom plate 45 has a ventilation structure allowing passage of the circulation gas and is formed into a disk shape corresponding to the shape of the ventilation part 35. The net 43 has stretchability that deforms an outer peripheral part 43c thereof into a cylindrical shape along the inner peripheral surface 31 of he passage 32 in a state where the net is loaded on the canister body 30.

Description

  The present invention relates to a package for carbon dioxide absorbent and a carbon dioxide absorbent unit.

  Normally, an anesthesia circulatory breathing circuit absorbs carbon dioxide contained in the patient's exhalation and allows the remaining oxygen and anesthetic gas to be reused (supplied as inspiration again). Is provided on the circuit.

  Conventionally, a technique for accommodating a carbon dioxide absorbent in this type of canister has been proposed (see, for example, Patent Document 1).

  Patent Document 1 discloses an apparatus in which a unit in which a carbon dioxide absorbing compound is accommodated in a gas cover is accommodated in a container provided in a circulation system type anesthesia system. The gas cover is made of cellulose fiber, cotton gauze, paper or the like. In this device, the used unit can be removed from the container and replaced with a new unit.

  However, the unit of Patent Document 1 has a configuration in which a carbon dioxide absorbing compound is simply covered with a gas cover and placed in a container. For this reason, a gap or soot is generated between the outer periphery of the gas cover and the inner periphery of the container, and there is a problem that the circulating gas passes through such a gap or soot.

Japanese National Patent Publication No. 11-513271

  The present invention has been made in view of such circumstances, and its purpose is to prevent the circulation of circulation gas and to make a good contact of the circulation gas with the carbon dioxide absorbent, and a carbon dioxide absorbent package and carbon dioxide. It is to provide an absorbent unit.

The present invention is grasped by the following composition.
(1) The present invention is a carbon dioxide absorbent packaging body loaded in a canister provided in a circulation type breathing circuit, and is formed in a cylindrical shape having a bottom portion and can accommodate a granular carbon dioxide absorbent. And a net capable of closing the upper opening, and a bottom plate interposed between the bottom of the net and the carbon dioxide absorbent and placed on a disk-like vent provided in the flow path of the cylindrical canister body The bottom plate has a ventilation structure through which the circulating gas can pass and is formed in a disk shape corresponding to the shape of the ventilation portion, and the net has an outer peripheral portion of the net in a state of being loaded in the canister body. It has the elasticity which deform | transforms into the cylindrical shape along the internal peripheral surface of a flow path.

(2) The present invention is characterized in that, in the configuration of the above (1), the net is composed of a polyamide yarn, a polyurethane yarn, a polyester yarn or a composite yarn thereof.

(3) In the configuration of (1) or (2), the present invention is such that the outer diameter of the bottom plate is set smaller than the inner diameter of the flow path, and the difference between the outer diameter of the bottom plate and the inner diameter of the flow path is 2 mm or more and 40 mm. It is characterized by the following.

(4) The present invention is characterized in that, in any one of the configurations (1) to (3), the ventilation structure is configured by a plurality of through holes.

(5) The present invention is characterized in that, in any one of the configurations (1) to (3), the ventilation structure is configured by a mesh-like member.

(6) According to the present invention, in any one of the above configurations (1) to (5), the opening is closed at the center of the net in a plan view, and the closed portion of the net is It is characterized in that it can be held without touching the carbon absorbent.

(7) In the configuration of (6), the present invention is characterized in that the opening is closed by connecting the upper part of the net.

(8) In the configuration of (6), the present invention is characterized by further comprising a closing unit that closes the opening with the upper portion of the net interposed therebetween.

(9) The present invention is characterized in that, in the configuration of (6), the net is made of a heat-weldable material, and the opening is closed by heat welding.

(10) In the configuration according to any one of the above (1) to (9), the present invention provides a spacer that forms a gap between the closed portion of the net and the carbon dioxide absorbent accommodated in the net. It is characterized by providing.

(11) In the configuration of (10), the present invention is characterized in that a gap of 10 mm to 40 mm is formed by the spacer.

(12) In the configuration of (10) or (11), the present invention is characterized in that the spacer is formed in a truncated cone shape whose diameter is reduced upward.

(13) The present invention is a carbon dioxide absorbent unit loaded in a canister provided in a circulation type breathing circuit, and the carbon dioxide absorbent package according to any one of the above (1) to (12) And a granular carbon dioxide absorbent accommodated in a package for carbon dioxide absorbent.

  ADVANTAGE OF THE INVENTION According to this invention, the package for carbon dioxide absorbents and the carbon dioxide absorbent unit which prevent the circulation of circulation gas and make the circulation gas contact with a carbon dioxide absorbent favorably can be provided.

It is a mimetic diagram of a circulation type breathing circuit concerning an embodiment of the present invention. 1 is a perspective view of a canister according to an embodiment of the present invention. FIG. 3 is a side view of a carbon dioxide absorbent unit as seen by cutting a canister body along line AA in FIG. 2. It is the figure which expanded a part of net | network shown by FIG. (A) is a top view of the baseplate shown by FIG. 3, (b) is a top view of the baseplate of a 1st modification, (c) is a top view of the baseplate of a 2nd modification. FIG. 4 is a view taken in the direction of arrow B in FIG. 3. It is explanatory drawing of a comparative example, and is the figure drawn corresponding to FIG. 6, (a) is a figure which shows the clearance gap formed in the outer peripheral part of a net, (b) is the ridge formed in the outer peripheral part of a net FIG. It is explanatory drawing of another comparative example, and is the figure drawn corresponding to FIG. It is a figure which shows the other example of the carbon dioxide absorbent unit which concerns on embodiment of this invention, and is the figure drawn corresponding to FIG. FIG. 10 is a perspective view of the spacer shown in FIG. 9.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as “embodiments”) will be described in detail with reference to the accompanying drawings. The same number is attached | subjected to the same element through the whole description of embodiment.

(Configuration of circulating breathing circuit 10)
First, the configuration of the circulatory breathing circuit 10 will be described with reference to FIG.
As shown in FIG. 1, this circulatory breathing circuit 10 is a breathing circuit used for surgical anesthesia, and includes an inhalation valve 11, an artificial nose 12 having a patient connection end 12a, an exhalation valve 13, an exhaust unit 15, and a canister 20. Have The artificial nose 12 is used as necessary. The intake valve 11 operates to allow the flow of anesthetic gas (inhalation) to the artificial nose 12 (patient side) but restrict the reverse flow. The exhalation-valve 13 allows the flow of a part of exhalation from the artificial nose 12 (patient side) to the canister 20 and the flow of the remaining part to the exhaust part 15 as surplus gas, but the reverse flow is restricted. Operates to The canister 20 serves to absorb and remove carbon dioxide from the exhaled breath of the patient and to circulate and use other circulating gas as part of the inspiration. In the circulatory breathing circuit 10, an amount of exhaled air corresponding to the newly added fresh gas 16 is exhausted as excess gas from the exhaust unit 15 to the outside of the circuit, and the remaining exhaled air is reused through the canister 20. .

(Configuration of canister 20)
Next, the configuration of the canister 20 will be described with reference to FIGS.
As shown in FIG. 2, the canister 20 includes a cylindrical and transparent canister body 30 and a carbon dioxide absorbent unit 40 loaded in the canister body 30.

  The upper and lower ends of the canister body 30 are open, and the inner peripheral surface 31 of the canister body 30 forms a flow path 32. A disk-shaped ventilation portion 35 is provided in the lower end opening 33 of the flow path 32. The ventilation portion 35 has, for example, a perforated structure (punching) or a mesh structure (mesh) that does not generate excessive ventilation resistance when the circulating gas passes. The constituent material of the ventilation part 35 can be arbitrarily selected from various materials such as metal. In the canister body 30, the circulating gas flows from below through the lower end opening 33, and flows out from the upper end opening 36 through the flow path 32. In addition, the material which comprises the canister main body 30 can use synthetic resins, such as a polysulfone (PSF), a polyethylene terephthalate (PET), a polycarbonate (PC), an acryl, polyvinyl chloride (PVC), for example.

(Configuration of carbon dioxide absorbent unit 40)
As shown in FIG. 3, the carbon dioxide absorbent unit 40 includes a carbon dioxide absorbent package 41 and a granular carbon dioxide absorbent 42 accommodated in the carbon dioxide absorbent package 41. The carbon dioxide absorbent packaging body 41 includes a net 43, and a bottom plate 45 interposed between the bottom 43 a of the net 43 and the carbon dioxide absorbent 42.

The carbon dioxide absorbent 42 contacts the circulating gas flowing upward through the flow path 32 and absorbs carbon dioxide (CO ₂ ) contained in the circulating gas. For the carbon dioxide absorbent 42, it is possible to use a medical carbon dioxide collecting agent obtained by molding slaked lime (calcium hydroxide (Ca (OH) ₂ )) containing a plurality of additives into a granular form of several mm to 1 cm. it can.

  The net 43 is formed in a cylindrical shape having a bottom 43a. The net 43 can accommodate the carbon dioxide absorbent 42 and the upper opening can be closed, and after the predetermined amount of the granular carbon dioxide absorbent 42 is filled, the upper opening is closed. More specifically, the opening is closed at the center of the net 43 in plan view, and the closed portion 43b of the net 43 (hereinafter referred to as “blocking portion 43b”) is a carbon dioxide absorbent by the operator. It is configured to be able to be gripped without touching 42. For example, the opening can be closed by connecting the upper part of the net 43. In addition, the opening is closed by closing the upper portion of the net 43 with closing means (not shown) (for example, a string, a band, a clamp, etc.), or the net 43 is made of a heat-weldable material, and a heat sealer. It can also be blocked by heat welding using, for example.

  The net 43 has elasticity that deforms the outer peripheral portion 43 c into a cylindrical shape along the inner peripheral surface 31 of the flow path 32 in a state where the net 43 is loaded in the canister body 30. The net 43 can be made of a material widely used for stockings and draining nets, such as polyamide (PA) yarn, polyurethane (PU) yarn, polyester (PET) yarn, or a composite yarn thereof. The net 43 can be knitted in any manner, but for example, a net 43 manufactured by a knitting method based on various types of loop knitting (for example, loop knitting shown in FIG. 4) can be preferably used.

  As shown in FIG. 3, the bottom plate 45 is placed on the ventilation portion 35 of the canister body 30 via the bottom portion 43 a of the net 43. The bottom plate 45 has a ventilation structure 45 a (see FIG. 5) through which the circulating gas can pass and is formed in a disk shape corresponding to the shape of the ventilation portion 35. The material constituting the bottom plate 45 may be any resin material resistant to water, volatile anesthetic gas, and strong alkali. For example, polypropylene (PP), polyethylene (PE), polystyrene (PS), poly A general-purpose resin such as vinyl chloride (PVC) can be used.

  The outer diameter d of the bottom plate 45 is set smaller than the inner diameter D of the flow path 32, and the difference between the outer diameter d of the bottom plate 45 and the inner diameter D of the flow path 32 is preferably selected from a range of 2 mm or more and 40 mm or less. can do.

(Venting structure 45a of bottom plate 45)
Here, a configuration example of the ventilation structure 45a of the bottom plate 45 and a modification thereof will be described with reference to FIG.

  For example, as shown to Fig.5 (a), the ventilation structure 45a can be comprised by the perforation structure which has several polygonal through-holes 45b. The size of the through hole 45 b can be set larger than the particle size of the carbon dioxide absorbent 42 because the carbon dioxide absorbent 42 is covered with the net 43. That is, the through-hole 45b can be set sufficiently large so that the circulating gas can be satisfactorily passed as long as the rigidity required for the bottom plate 45 is ensured.

(First and second modified examples of the ventilation structure 45a)
Moreover, as shown in FIG.5 (b), the ventilation structure 45a can be comprised by the perforation structure which has several circular through-holes 45c (1st modification). Further, as shown in FIG. 5C, the ventilation structure 45a can be constituted by a mesh-like member 45d (second modified example).

(Effect of embodiment)
The effects of the embodiment described above will be described.
According to the present embodiment, the disk-shaped bottom plate 45 is placed on the ventilation portion 35 of the canister body 30, whereby the shape of the bottom portion 43 a of the net 43 is held in a disk shape. Further, as shown in FIG. 6, due to the stretchability of the net 43, the outer peripheral portion 43 c of the net 43 is formed in a cylindrical shape along the inner peripheral surface 31 of the flow path 32. There is no gap between the outer peripheral portion 43 c and the inner peripheral surface 31 of the flow path 32. The upper portions of the net 43 and the carbon dioxide absorbent 42 can be formed flat by a simple operation such that the canister body 30 is moved lightly.

  As shown in FIG. 7A, when the net 101 made of cellulose fiber, cotton gauze, or paper is used without providing a bottom plate, the net 101 is insufficiently stretchable. 102 does not follow the inner peripheral surface 31 of the flow path 32, and an arc-shaped gap 103 is generated. Alternatively, as shown in FIG. 7B, a wrinkle 105 is generated on the outer peripheral portion 102 of the net 101. In this case, the circulating gas passes through the gap 103 and the trough 105. Such a problem caused by the gap 103 and the flange 105 can be solved by using the net 43 having elasticity. However, as shown in FIG. 8, it is difficult to sufficiently contact the inner peripheral surface 31 of the flow path 32 and the outer peripheral portion 43 c of the net 43 simply by using the stretchable net 43. For this reason, the circulating gas containing carbon dioxide cannot be sufficiently brought into contact with the carbon dioxide absorbent 42.

  In this regard, according to the present embodiment, no gap is generated between the outer peripheral portion 43c of at least the lower half of the net 43 and the inner peripheral surface 31 of the flow path 32 (see FIG. 6). The inner peripheral surface 31 and the outer peripheral portion 43c of the net 43 can be sufficiently brought into contact with each other in the cylinder axis direction of the canister body 30 (see FIG. 3). Thereby, the circulation gas circulation at the outer peripheral portion 43 c of the net 43 can be eliminated, and the circulation gas containing carbon dioxide can be sufficiently brought into contact with the carbon dioxide absorbent 42.

(Other examples of carbon dioxide absorbent units)
Next, another example of the carbon dioxide absorbent unit will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the element which is common in the carbon dioxide absorbent unit 40 (refer FIG. 3) mentioned above, and the overlapping description is abbreviate | omitted.

  In the carbon dioxide absorbent unit 40 (see FIG. 3) described above, the configuration in which the upper portion of the net 43 and the carbon dioxide absorbent 42 are close to each other is shown. A gap can also be formed between the carbon absorbent 42 and the carbon absorbent 42.

  For example, as shown in FIG. 9, the carbon dioxide absorbent unit 50 employs a carbon dioxide absorbent package 70 including a spacer 60. The spacer 60 is interposed between the closed portion 43 b of the net 43 and the upper surface of the carbon dioxide absorbent 42 accommodated in the net 43 to form a gap 61.

  As shown in FIG. 10, for example, a spacer 60 having a truncated cone shape whose diameter is reduced upward can be used. In this example, a lower disk 62 having a ventilation structure 45a, an upper disk 63 formed with a smaller diameter than the lower disk 62 and spaced above the lower disk 62, and these lower disks 62 And the spacer 60 is comprised by the some rod-shaped connection part 65 which connects the outer periphery of the upper disc 63 mutually. The size C (see FIG. 9) of the gap 61 formed by the spacer 60 can be arbitrarily set, but can be suitably selected from a range of 10 mm to 40 mm. The material constituting the spacer 60 is arbitrary as long as it is a resin material resistant to water, volatile anesthetic gas, and strong alkali. For example, polypropylene (PP), polyethylene (PE), polystyrene (PS), poly A general-purpose resin such as vinyl chloride (PVC) can be used.

  According to the carbon dioxide absorbent unit 50, forming the gap 61 makes it difficult for wrinkles to be formed on the net 43 even in the closed portion 43b and its periphery. As a result, on the central side of the carbon dioxide absorbent unit 50, the flow of the circulating gas (FIG. 9, arrow (1)) is the same as the flow of the circulating gas in the carbon dioxide absorbent unit 40 described above (FIG. 3, arrow (2). Compared with)), it is less affected by the blocking portion 43b and becomes substantially straight upward.

  As mentioned above, although this invention was demonstrated using embodiment, it cannot be overemphasized that the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above embodiment. Further, it is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Circulating breathing circuit 20 Canister 30 Canister main body 31 Inner peripheral surface 32 Flow path 33 Lower end opening part 35 Ventilation part 36 Upper end opening part 40 Carbon dioxide absorbent unit 41 Carbon dioxide absorbent packaging body 42 Carbon dioxide absorbent 43 Net 43a Bottom 43b Blocking part (net blocked part)
43c Outer peripheral part 45 Bottom plate 45a Ventilation structure 45b Through hole 45c Through hole 45d Mesh member 50 Carbon dioxide absorbent unit 60 Spacer 61 Gap 70 Carbon dioxide absorbent package C Size of gap d Bottom plate outer diameter D Flow path Inner diameter

Claims (13)

A package for carbon dioxide absorbent loaded in a canister provided in a circulation type breathing circuit,
A net that is formed in a cylindrical shape having a bottom, can store granular carbon dioxide absorbent, and can close an upper opening,
A bottom plate interposed between a bottom portion of the net and the carbon dioxide absorbent, and placed on a disk-like ventilation portion provided in a flow path of a cylindrical canister body,
The bottom plate has a vent structure through which circulating gas can pass and is formed in a disc shape corresponding to the shape of the vent portion,
The carbon dioxide absorbent packaging, wherein the net has a stretchability that deforms the outer peripheral portion of the net into a cylindrical shape along the inner peripheral surface of the flow path in a state where the net is loaded in the canister body. body.   The package for carbon dioxide absorbent according to claim 1, wherein the net is composed of polyamide yarn, polyurethane yarn, polyester yarn, or a composite yarn thereof. The outer diameter of the bottom plate is set smaller than the inner diameter of the flow path,
The carbon dioxide absorbent packaging body according to claim 1 or 2, wherein a difference between an outer diameter of the bottom plate and an inner diameter of the flow path is 2 mm or more and 40 mm or less.   The package for carbon dioxide absorbent according to any one of claims 1 to 3, wherein the ventilation structure includes a plurality of through holes.   The carbon dioxide absorbent packaging body according to any one of claims 1 to 3, wherein the ventilation structure is constituted by a net-like member. The opening is closed at the center of the net in plan view;
6. The carbon dioxide absorbent according to claim 1, wherein the closed portion of the net is configured to be gripped by an operator without touching the carbon dioxide absorbent. Packaging body.   The said opening part is obstruct | occluded by connecting the upper part of the said net | network, The package for carbon dioxide absorbents of Claim 6 characterized by the above-mentioned.   The package for carbon dioxide absorbent according to claim 6, further comprising a closing unit that closes the opening with the upper portion of the net interposed therebetween. The net is made of a heat-weldable material,
The said opening part is obstruct | occluded by heat welding, The package for carbon dioxide absorbents of Claim 6 characterized by the above-mentioned.   The carbon dioxide according to any one of claims 1 to 9, further comprising a spacer that forms a gap between a closed portion of the net and the carbon dioxide absorbent accommodated in the net. Packaging for carbon absorbent.   The package for carbon dioxide absorbent according to claim 10, wherein the gap is formed by 10 mm or more and 40 mm or less by the spacer.   The package for carbon dioxide absorbent according to claim 10 or 11, wherein the spacer is formed in a truncated cone shape whose diameter is reduced upward. A carbon dioxide absorbent unit loaded in a canister provided in a circulation breathing circuit,
A package for carbon dioxide absorbent according to any one of claims 1 to 12,
A carbon dioxide absorbent unit comprising: a granular carbon dioxide absorbent housed in the carbon dioxide absorbent package.

Images