JPS606208Y2 - Drug sustained release device to tree trunk - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for administering medication to a tree trunk, and more specifically to a device for gradually administering drugs such as insecticides and antimicrobial agents into a tree trunk.

Conventionally, liquid or powder insecticides have been sprayed on trees to eliminate or kill pests in trees, and
Insecticides are sprayed into the soil around the base of trees, but with this method, the insecticides are quickly washed away by rain, making it impossible to obtain a sufficient effect. There is a risk that the water may enter well water, tap water sources, etc. and cause environmental pollution.

For this reason, a method has been proposed in which a synthetic resin ampoule-shaped bottle filled with a liquid containing an insecticide is inserted into a hole drilled in the tree trunk, and the insecticide is administered directly into the tree trunk (Jetkai Sho. 53-115886), the insecticide is administered directly into the tree trunk from the bottle opening, so the administration is localized, and on the other hand, the drug lacks sustained release, so there is a risk of concentration disturbance due to the drug. , long-term preventive and therapeutic effects cannot be expected.

Furthermore, there is a risk that the drug will leak out through the insertion hole of the bottle into the tree trunk.

The present invention has been made in view of the above, and an object of the present invention is to provide a device that can gradually administer a drug to a tree trunk.

As shown in the drawings, the device according to the present invention is made of a hydrophilic polymer capable of absorbing water up to about twice its own volume, and contains a drug solution, milk, etc. in a container 2 having an opening 1. It is characterized by enclosing a turbid liquid or suspension and a water-absorbing polymer 3 capable of absorbing water of about 10@ or more of its own volume.

In the present invention, the chemicals include insecticides, antimicrobial agents, fertilizers, nutrients, plant hormones, and other chemicals that are preferably administered directly to the tree trunk, such as insecticides such as Rannate, Guidistone, and Terracure P, cabtan, Antimicrobial agents such as gliosin, benlate, thiobendazole, amical, biocide, kasugamycin, griseofulvin, polyoxin, etc. are used, but are not limited to these.

These drugs are enclosed in containers in the form of solutions, emulsions or suspensions.

The container is formed, for example, into a cylindrical shape from a water-absorbing polymer so as to have a micro-diameter opening, and the water-absorbing polymer is preferably one that can absorb about twice or less of its own amount of water, such as ethylene- Vinyl acetate copolymers, particularly copolymers having a vinyl acetate content of 15% by weight or more, are preferably used because of their appropriate water absorption properties.

In addition, the water-absorbing polymer is preferably one that can absorb about 1 times its own volume of water or more, such as starch-absorbing polymer.
Examples include synthetic polymers such as acrylamide copolymer, starch-acrylonitrile copolymer, and dextran-acrylonitrile copolymer, and natural polymers such as gelatin, carrageenan, agar, and konjac powder.

When the device is inserted into the tree trunk, such a water-absorbing polymer absorbs water from the tree trunk, swells, and increases the pressure within the container to gradually force the drug solution into the tree trunk through the opening.

When using the device according to the present invention, an appropriate number of holes are usually drilled at appropriate positions on the tree trunk depending on the size of the container, and the device is inserted into these holes.

The container made of a hydrophilic polymer absorbs water from the tree trunk, and as the water-absorbing polymer inside gradually absorbs water and swells, the drug solution in the container is gradually administered into the pores from the opening.
In this way, the desired prevention, treatment, fertilization effects, etc. can be stably achieved over a long period of time.

[Brief explanation of the drawing]

The drawing is a cross-sectional view showing an embodiment of a device according to the present invention. 1...Opening, 2...Container, 3...
...Water-absorbing polymer.

Claims (1)

[Scope of utility model registration request] A drug solution in a container made of a hydrophilic polymer capable of absorbing water up to about twice its own volume and equipped with an opening;
1. A drug sustained release device to a tree trunk, characterized in that it encapsulates an emulsion or suspension and a water-absorbing polymer capable of absorbing water of about 100@ or more of its own volume.